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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Tue, 14 Nov 2017 22:04:13 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:25098:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"f70RBvkUEFTzylEQJOCWR9iRilDznRH4i-5TZ4ZbC5Yeq0jPJEUuC_gEoZaZkPD5AcF7fcwWPA\">\n    <title>Yaffs for VxWorks | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"f70RBvkUEFTzylEQJOCWR9iRilDznRH4i-5TZ4ZbC5Yeq0jPJEUuC_gEoZaZkPD5AcF7fcwWPA\">\n    <js-placeholder 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/documents\">Documents</a>\n              </li>\n          <li  class=\"active\">\n                  Yaffs for VxWorks\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>Yaffs for VxWorks</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/documents/yaffs-vxworks\" class=\"paper is-promoted full clearfix\">\n\n  \n    \n\n      <footer>\n      \n      <div class=\"author\">\n        Submitted by <span><span lang=\"\" about=\"/user/admin\" typeof=\"schema:Person\" property=\"schema:name\" datatype=\"\">Admin</span></span>\n on <span>11 January, 2016 - 3:28pm</span>\n        \n      </div>\n    </footer>\n  \n  <div class=\"content\">\n    \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p>The source and the definitive version of this document can be found in our git repository,&nbsp;<a href=\"http://www.aleph1.co.uk/gitweb/?p=yaffs-docs;a=tree;h=f4fcbdc9da052aa926c4bc2275547ca310eebbd8;hb=9d50c62a1c24f1b9dd00ec3eb6d0bddff0aed17d\">together with other Yaffs documents</a>.</p>\n<h2>1 Background</h2>\n<p>The purpose of this document is to describe the Yaffs-for-VxWorks wrapper as well as provide sufficient information to port Yaffs to the VxWorks BSP. This document assumes a working knowledge of VxWorks.</p>\n<p>This document does not describe the inner workings of Yaffs and a study of other Yaffs documents is recommended. Documents shown below in <em>italics</em> are available at <em><a href=\"http://www.yaffs.net/documents\">http://www.yaffs.net/documents</a>...</em></p>\n<h2>2 Licensing</h2>\n<p>Yaffs was originally released for Linux under the GNU Public License (GPL). Various embedded developers soon identified that Yaffs would be ideal for their applications, but were not able to use GPL based code in their systems. Aleph One Ltd has alternative licensing arrangements to support such applications.</p>\n<p>Since VxWorks is proprietary code that is incompatible with GPL, alternative licensing arrangements must be sought to use Yaffs with VxWorks or most other embedded RTOSs.</p>\n<h2>3 What are Yaffs and Yaffs Direct Interface?</h2>\n<p>Yaffs stands for Yet Another Flash File System and was the first file system designed from the ground up for NAND flash storage.</p>\n<p>In 2002 Aleph One set out to identify file system options for using NAND Flash as a file system. Various file systems available at the time were evaluated and all were found lacking in one way or another. The need for a suitable NAND storage file system was identified and Yaffs was designed to fill that need.</p>\n<p>Although Yaffs was originally designed for NAND flash, it has been used successfully with NOR flash systems and even as a RAM file system. This allows high reliability file systems to be constructed using NOR flash, with a future migration path to NAND flash for higher density and performance.</p>\n<p>Yaffs was originally designed for use with the Linux operating system, but was designed in a very modular way. The operating-system-specific code was kept separate from the main Yaffs file system code. This allows Yaffs to be ported quite cleanly to other operating systems through operating system personality modules. One such personality module is the Yaffs Direct Interface (YDI) which allows Yaffs to be simply integrated with embedded systems, with or without an RTOS. See <a href=\"http://www.yaffs.net/documents/yaffs-direct-interface\">http://www.yaffs.net/documents/yaffs-direct-interface</a></p>\n<p>The current version is Yaffs2, which supports a wider range of NAND flash components including 2k/4k/8k or even 16k page devices and devices with multi-level cells (MLC), and produces equivalent or better performance. Yaffs2 include Yaffs1 compatibility code so Yaffs1 images still work and migration is quite simple. Yaffs1 or Yaffs2 mode of operation are simply selected by a run-time parameter.</p>\n<p>As well as providing a NAND file system, YDI also provides a RAM emulation layer to allow Yaffs to operate as a RAM file system too. While the RAM emulation is perhaps not as efficient as a dedicated RAM file system, this does allow one well proven file system to use both RAM and flash.</p>\n<p>Yaffs has been used for many products using various operating systems including Windows Embedded Compact (previously called Windows CE) and various RTOSs, including ThreadX, vXworks, pSOS to name just a few. Note that there is a native port of Yaffs to eCOS that does not use YDI. This is supported and distributed by eCocCentric.(<a href=\"http://www.ecoscentric.com/\">http://www.ecoscentric.com/</a>).</p>\n<h2>4 Why use Yaffs?</h2>\n<p>For an in depth understanding of the advantages of Yaffs, please read <em><a href=\"http://www.yaffs.net/documents/considerations-choosing-flash-file-system\">http://www.yaffs.net/documents/considerations-choosing-flash-file-system</a></em></p>\n<p>For a brief overview: Yaffs is the first, and perhaps only, file system designed specifically for NAND flash. This means that Yaffs has been designed to work around the various limitations and quirks of NAND flash, as well as exploit the various features of NAND to achieve an effective file system.</p>\n<p>Some features to consider:</p>\n<ul>\n<li>Yaffs has been well proven and has been used to ship in large volumes in several products using many different operating systems, compilers and processors.</li>\n<li>Yaffs is written in portable C and is endian neutral.</li>\n<li>Yaffs provides bad block handling and ECC algorithms to handle deficiencies in NAND flash.</li>\n<li>Yaffs is a log-structured file system which makes it very robust to corruptions caused by power failures etc.</li>\n<li>Yaffs has highly optimised and predictable garbage collection strategies. This makes it high performance and very deterministic when compared with similar file systems.</li>\n<li>Yaffs has a lower memory footprint than most other log-structured flash file systems.</li>\n<li>Yaffs provides a wide range of POSIX-style file system support including directories, symbolic and hard links etc. through standard file system interface calls.</li>\n<li>Yaffs is highly configurable to work with various flash geometries, various ECC options, caching options etc.</li>\n<li>Yaffs Direct Interface is simple to integrate in a system – only a few interface functions are required.</li>\n<li>Yaffs can be used with a wide range of memory technologies.</li>\n</ul>\n<h2>5 What is Yaffs -for-VxWorks?</h2>\n<p>Many organizations have used Yaffs on VxWorks with just Yaffs Direct Interface (YDI). So what benefit does Yaffs-for-VxWorks offer?</p>\n<p>YDI provides a POSIX-like API, but with Yaffs specific names. For example: yaffs_open(), yaffs_read(), yaffs_close() etc.</p>\n<p>While YDI provides a solution for many systems, and is very well proven, it has one major drawback. It is not a native file system. That means:</p>\n<ul>\n<li>Existing code that calls open(), read(), write() etc cannot be immediately used with YDI. The code needs to be rewritten to call the YDI functions: yaffs_open(), yaffs_read()... This porting is costly and error prone.</li>\n<li>Code written for YDI is then locked to Yaffs and makes portability/testability problems.</li>\n<li>Tools such as the VxWorks console shell cannot be used to access Yaffs files via YDI.</li>\n</ul>\n<p>Yaffs-for-VxWorks fixes these limitations..</p>\n<p>Yaffs-for-VxWorks is a wrapper around YDI that plugs YDI in as a native file system (ie. Yaffs becomes a file system that is accessed no different from any of the other file systems on system. This makes it really easy to migrate existing VxWorks software, or develop new VxWorks software to get the benefits of Yaffs.</p>\n<p>Yaffs-for-VxWorks follows the VxWorks operating system model used by other VxWorks file systems, so it is easy for VxWorks developers to integrate Yaffs and integrate it with their normal workflow.</p>\n<p>As mentioned above, Yaffs-for-VxWorks is a wrapped version of YDI. That means all the testing and experience of using YDI since 2002 is incorporated into Yaffs-for-VxWorks.</p>\n<p>Yaffs is already supported in u-boot, so if you\'re using u-boot as a boot loader then there is already seamless support for Yaffs file system access between the boot loader and VxWorks.</p>\n<p>Some organizations have developed their own VxWorks wrappers for Yaffs, but using the Yaffs-for-VxWorks wrapper saves a lot of integration and testing effort.</p>\n<p>Once the Yaffs-for-VxWorks file system code is loaded into the kernel, flash devices are added using yaffs_devAdd(). They are then available in the VxWorks file system for access just like any other files in the system.</p>\n<p><img alt=\"Yaffs and VxWorks conceptual relationships\" src=\"/sites/yaffs.net/files/images/yaffs-vxworks.png\" /></p>\n<p>&nbsp;</p>\n<h2>6 Yaffs-for-VxWorks code</h2>\n<p>Yaffs-for-VxWorks is supplied as a VxWorks Downloadable Kernel Module (DKM) project with full source code. This can then be modifies into a BSP layer or library and compiled directly into the kernel.</p>\n<p>The code comprises Yaffs Direct Interface (YDI) plus two wrapper files:</p>\n<ul>\n<li>yaffs_drv.c: This file does all the iosLib interfacing (ie. plugs Yaffs in as a VxWorks file system and plugs in the flash devices as file system devices. This file provides one externally visible function call: yaffs_devAdd() which allows Yaffs devices (ie. Flash drivers) to be plugged in.</li>\n<li>yaffx_vx_glue.c: This file provides all the OS resources that Yaffs needs from VxWorks. For example, it initialises a semaphore and does any error code routing.</li>\n</ul>\n<p>In addition, if the Yaffs filesystem driver is build as a DKM, a file called yaffs_dkm.c provides the dummy DKM start() function.</p>\n<p>The code is provided as a DKM project. This includes the specification of the DEFINES needed to compile Yaffs under VxWorks. If the code is moved out of the DKM then it is important to make sure the correct DEFINES are set up.</p>\n<h2>7 Example Simulated Flash Driver</h2>\n<p>The Yaffs-for-VxWorks package provides an example Yaffs device that runs on a RAM simulator. This allows the file system to be tested in a simulation target without flash memory (eg the VxWorks simulator). This also provides an example for how to develop a flash driver and plug it in to Yaffs.</p>\n<h2>8 Example Real Time Process(RTP)</h2>\n<p>An example RTP is provided that performs some basic file system operations and demonstrates a working filesystem.</p>\n<p>This RTP uses standard file system calls (open(), read(), write()...) demonstrating that the Yaffs-for-VxWorks layer is operating as a native file system.</p>\n<h2>9 Integrating a Flash Device</h2>\n<p>Integrating a flash device is a relatively straight-forward process.</p>\n<p>The device is set up as a yaffs_device structure, which is then installed into Yaffs by calling the yaffs_devAdd() function.</p>\n<p>The NAND simulator can serve as an example for how to do this. The following snippet outlines the requirements. For a better description of the params and drv sub-structures refer to <a href=\"http://www.yaffs.net/yaffs-tuning-and-configuration\">http://www.yaffs.net/yaffs-tuning-and-configuration</a>.</p>\n<p>&nbsp;</p>\n<p><code>struct yaffs_dev *yramsim_CreateRamSim(...)<br />\n{<br />\n...<br />\n&nbsp; dev = malloc(sizeof(*dev));<br />\n...<br />\n&nbsp; /* First set everything to NULL. */<br />\n&nbsp; memset(dev, 0, sizeof(*dev));<br />\n&nbsp;<br />\n&nbsp; /*&nbsp;<br />\n&nbsp; &nbsp;* There are three sections to the yaffs_dev structure<br />\n&nbsp; &nbsp;* that needs to be initialised:<br />\n&nbsp; &nbsp;* * The params sub-structure which are all the control<br />\n&nbsp; &nbsp;* parameters.<br />\n&nbsp; &nbsp;* * The drv sub-structure which holds the driver functions.<br />\n&nbsp; &nbsp;* * The context which holds a private pointer (used to hold a<br />\n&nbsp; &nbsp;* driver context).<br />\n&nbsp; &nbsp;*/<br />\n&nbsp; p = &amp;dev-&gt;param;<br />\n&nbsp; p-&gt;name = strdup(name);<br />\n&nbsp; p-&gt;start_block = start_block;<br />\n&nbsp; p-&gt;end_block = end_block;<br />\n&nbsp; p-&gt;total_bytes_per_chunk = DATA_SIZE;<br />\n&nbsp; p-&gt;spare_bytes_per_chunk= SPARE_SIZE;<br />\n&nbsp; p-&gt;chunks_per_block = PAGES_PER_BLOCK;<br />\n&nbsp; p-&gt;n_reserved_blocks = 2;<br />\n&nbsp; p-&gt;use_nand_ecc = 1;<br />\n&nbsp; p-&gt;inband_tags = 0;<br />\n&nbsp; p-&gt;is_yaffs2 = 1;<br />\n&nbsp;<br />\n&nbsp; d= &amp;dev-&gt;drv;<br />\n&nbsp; d-&gt;drv_initialise_fn = yramsim_initialise;<br />\n&nbsp; d-&gt;drv_deinitialise_fn = yramsim_deinitialise;<br />\n&nbsp; d-&gt;drv_read_chunk_fn = yramsim_rd_chunk;<br />\n&nbsp; d-&gt;drv_write_chunk_fn = yramsim_wr_chunk;<br />\n&nbsp; d-&gt;drv_erase_fn = yramsim_erase;<br />\n&nbsp; d-&gt;drv_check_bad_fn = yramsim_check_block_bad;<br />\n&nbsp; d-&gt;drv_mark_bad_fn = yramsim_mark_block_bad;<br />\n&nbsp;<br />\n&nbsp; dev-&gt;driver_context= (void *)sim;<br />\n&nbsp;<br />\n&nbsp; return dev;<br />\n}<br />\n&nbsp;<br />\n&nbsp;<br />\nvoid start(void)<br />\n{<br />\n&nbsp; int result;<br />\n&nbsp; struct yaffs_dev *dev;<br />\n&nbsp;<br />\n&nbsp; printf(\"Yaffs RAMSIM started\\n\");<br />\n&nbsp;<br />\n&nbsp; /* Create and add a RAM simulator device.<br />\n&nbsp; &nbsp;* To add a different sort of device, set up the device<br />\n&nbsp; &nbsp;* and call yaffs_devAdd.<br />\n&nbsp; &nbsp;*&nbsp;<br />\n&nbsp; &nbsp;*/<br />\n&nbsp; dev = yramsim_CreateRamSim(\"/yramsim\", 0, 400, 0, 399);<br />\n&nbsp; printf(\"device is %p\\n\", dev);<br />\n&nbsp;<br />\n&nbsp; if (dev) {<br />\n&nbsp; result = yaffs_devAdd(dev);<br />\n&nbsp; printf(\"yaffs_devAdd() returned %d\\n\", result);<br />\n&nbsp; printf(\"yaffs RAM simulator now available in file system as %s\",<br />\n&nbsp; dev-&gt;param.name);<br />\n&nbsp;<br />\n}<br />\n}</code></p>\n<p>&nbsp;</p>\n<h2>10 Appendix: Running the examples on the VxWorks simulator</h2>\n<p>Once you have built the Yaffs_filesystem_driver and Yaffs_RAMSIM_device projects, you can start up Yaffs on the simulator as follows:</p>\n<ol>\n<li>Start the simulator.</li>\n<li>Load the Yaffs_filesystem_driver DKM by right clicking on the Yaffs_filesystem_driver project, then selecting Run/Debug Kernel Task...</li>\n<li>Load the Yaffs_RAMSIM_device DKM by right clicking on the Yaffs_filesystem_driver project, then selecting Run/Debug Kernel Task...</li>\n</ol>\n<p>At this stage the VxWorks console should look something like:</p>\n<pre>\n _________            _________\n\n \\77777777\\          /77777777/\n\n  \\77777777\\        /77777777/\n\n   \\77777777\\      /77777777/\n\n    \\77777777\\    /77777777/\n\n     \\77777777\\   \\7777777/\n\n      \\77777777\\   \\77777/              VxWorks 7\n\n       \\77777777\\   \\777/\n\n        \\77777777\\   \\7/     Core Kernel version: 1.0.10.2\n\n         \\77777777\\   -      Build date: Oct 13 2015 12:10:53\n\n          \\77777777\\\n\n           \\7777777/         Copyright Wind River Systems, Inc.\n\n            \\77777/   -                 1984-2015\n\n             \\777/   /7\\\n\n              \\7/   /777\\\n\n               -   -------\n\n\n              Board: SIMLINUX board\n\n     OS Memory Size: 511MB\n\n   ED&amp;R Policy Mode: Deployed\n\n        Debug Agent: Started (always)\n\n    Stop Mode Agent: Not started\n\n\nLoading symbol table from charlesqcore:/home/charles/WindRiver/workspace/VIP_1/default/vxWorks.sym ...done\n\n-&gt; \n\nYaffs file system DKM started\n\nYaffs flash devices can now be added by calling yaffs_devAdd()\n\nYaffs RAMSIM started\n\ndevice is 0x8829e010\n\nAdding Yaffs device 0x8829e010 (/yramsim)\n\nyaffs_devAdd() returned 0\n\nyaffs RAM simulator now available in file system as /yramsim</pre>\n<p>&nbsp;</p>\n<p>At this stage you should be able to see the yaffs file system is running:</p>\n<pre>\n-&gt; ls \"/yramsim\"\n\n/yramsim/lost+found \n\nvalue = 0 = 0x0\n\n-&gt; </pre>\n<p>&nbsp;</p>\n<p>If you have built the yaffs_test project, then try running that. This should show something like:</p>\n<p>&nbsp;</p>\n<pre>\nStart running Yaffs test\n\n…\n\ndump directory from pwd\n\n./lost+found inode 2 length 2048 mode 41B6 directory\n\n\nfs size: 52297728 (51072k), free 51642368 (50432k), n files 4\n\nwrite_check_test()\n\nopening a\n\nOpen of a returned 3\n\nwrite_stuff_to_file returned 100000\n\n…\n\nFinished running Yaffs test</pre>\n<p>&nbsp;</p>\n<p>Do a file listing &nbsp;again will show the file system state after running the test:</p>\n<p>&nbsp;</p>\n<pre>\n-&gt; llr \"/yramsim\"\n\n\nListing Directory /yramsim:\n\ndrwxrwxrw-  1 0       0                 2048 Nov 25 14:07 level1/\n\n-rw-rw-rw-  1 0       0                50505 Nov 25 14:07 seek-trunc \n\n-rw-rw-rw-  1 0       0               123000 Nov 25 14:07 s \n\ndrw-rw-rw-  1 0       0                 2048 Nov 25 14:06 lost+found/\n\n\nListing Directory /yramsim/level1:\n\ndrwxrwxrw-  1 0       0                 2048 Nov 25 14:07 level2/\n\n\nListing Directory /yramsim/level1/level2:\n\ndrwxrwxrw-  1 0       0                 2048 Nov 25 14:07 level3/\n\n\nListing Directory /yramsim/level1/level2/level3:\n\ndrwxrwxrw-  1 0       0                 2048 Nov 25 14:07 level4/\n\n\nListing Directory /yramsim/level1/level2/level3/level4:\n\n\nListing Directory /yramsim/lost+found:\n\nvalue = 0 = 0x0</pre>\n<p>&nbsp;</p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Tue, 14 Nov 2017 12:50:07 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:13279:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"qFPJs82mPOpgKEIXQ2V7KAKlWMVI5fO_f9m2TcYofaxqDQfgsns-KLKmEzkma-v6YWmkMoWa3w\">\n    <title>HOWTO incorporate YAFFS in Linux | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"qFPJs82mPOpgKEIXQ2V7KAKlWMVI5fO_f9m2TcYofaxqDQfgsns-KLKmEzkma-v6YWmkMoWa3w\">\n    <js-placeholder 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">HOWTO incorporate YAFFS in Linux</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/archives/howto-incorporate-yaffs-linux\" typeof=\"schema:WebPage\" class=\"page is-sticky full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"HOWTO incorporate YAFFS in Linux\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h1>Brief HOWTO on incorporating yaffs as a root fs.</h1>\n<h4>By N C Bane &lt;<a href=\"denied:mailto:nick@cecomputing.co.uk\">nick@cecomputing.co.uk</a>&gt;</h4>\n<h3>Document status</h3>\n<p>This document is very much work in progress. It currently refers to YAFFS1 and needs updating for YAFFS2. It has been edited by different people with no attempt to keep a consistent style. Beauty will come with age. </p>\n<h2>What is yaffs?</h2>\n<p>Yaffs stands for Yet Another Flash Filing System. </p>\n<p>It is a journaling filesystem designed to run on NAND flash with special reference to embedded systems. </p>\n<h2>Why would I want to use it?</h2>\n<p>NAND flash (SmartMedia cards are repackaged raw NAND chips) is cheap and has a fast erase time as compared with NOR flash. </p>\n<p>The NAND physical interface is very simple. </p>\n<p>The small size and low current requirements make it very suitable for embedded systems. </p>\n<p>However, NAND has its problems. These are mainly due to bad block management as blocks of memory can be bad when the device is shipped and further blocks can become unusable over time. </p>\n<p>Power can die unpredictably in embedded systems leading to data loss and possibly file system corruption. </p>\n<p>This is where yaffs comes in; it handles bad blocks and uses formats which are resistant to corruption. </p>\n<h2>What do I need to know?</h2>\n<p>It is assumed that the reader has a development system with direct access to NAND flash (ie not a CF/SmartMedia adaptor which). </p>\n<p>The user should be familiar with building linux kernels and patching build trees. </p>\n<p>It is strongly suggested that you also read more about NAND flash on the Linux mtd site. </p>\n<h3>Assumptions:</h3>\n<p>You have already downloaded the yaffs sources from the cvs at Aleph1. </p>\n<p>You have mtd code that exposes NAND as an mtdblock device. </p>\n<h3>Nand interface:</h3>\n<p>For yaffs to function, it must be able to be the only code that writes to the oob area on the NAND device. </p>\n<p>The existing NAND driver in kernel 2.4.19 assumes that it will do the ecc/oob management for the host fs. For yaffs, this is quite wrong. </p>\n<p>You can disable ecc/oob calculations either by hand patching the mtd code to bypass ecc calculations or by merging the latest mtd cvs. </p>\n<p>The patches at <a href=\"http://www.toby-churchill.org\">http://www.toby-churchill.org</a> have done the latter. </p>\n<h3>Including yaffs as a kernel fs:</h3>\n<p>1) Create [linux]/fs/yaffs directory in your kernel test source. </p>\n<p>2) Copy devextras.h yaffs_fs.c yaffs_gets.c yaffs_guts.h yaffs_mtdif.c yaffs_mtdif.h yaffsinterface.h and yportenv.h from the yaffs sources to that directory. </p>\n<p>3) Copy the Makefile from either the yaffs sources (Makefile.kernel) or the Balloon download site below to [linux]/fs/yaffs/Makefile. </p>\n<p>4) Modify [linux]/fs/Config.in to include the 3 lines </p>\n<p><br />\n</p>\n<p>if [ &quot;CONFIG_MTD_NAND&quot; = &quot;y&quot; ]; then </p>\n<p>tristate &quot;Yaffs filesystem on NAND&quot; CONFIG_YAFFS_FS </p>\n<p>fi </p>\n<p>5) Modify [linux]/fs/Makefile to include the yaffs fs reference </p>\n<p><br />\n</p>\n<p>subdir-$(CONFIG_YAFFS_FS) +=yaffs </p>\n<p><br />\n</p>\n<p>6) Configure the kernel to include (not modules) all the mtd nand code (incl nand_ecc and mtdblock device) and yaffs fs. </p>\n<p>You should now be able to build a kernel with yaffs as a root fs using the normal tools. </p>\n<h3>Creating a bootable yaffs partition:</h3>\n<p>You can </p>\n<p>1) Create the partition by mounting it from a running linux os and copying the data there. The mkyaffs utility in the yaffs source simply erases a NAND mtdblock device without removing bad block data. </p>\n<p>2) Make and download a filesystem image. The mkyaffsimage utility that came with the sources will create a YAFFS block list in a file from a root tree. This is a list of 512+16 byte blocks that need to be placed (in any order) on a NAND device. </p>\n<p>You will need to write code to copy these data blocks and add in the block numbers in the oob areas. </p>\n<p>Examples of a modified handhelds.org bootldr for the Balloon board can be found on the toby-churchill.org website. </p>\n<h3>Booting into yaffs:</h3>\n<p>Modify your bootloader to pass a command line to linux to specifying the mtdblock/n that refers to the root partition. </p>\n<p>&nbsp; </p>\n<p>Balloon page at <a href=\"http://www.toby-churchill.org.uk\">http://www.toby-churchill.org.uk</a> </p>\n<p>Yaffs mailing list - to join go to <a href=\"http://stoneboat.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs\">http://stoneboat.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs</a> and enter your email address </p>\n<p>Linux MTD <a href=\"http://www.linux-mtd.infradead.org/\">http://www.linux-mtd.infradead.org/</a> </p>\n<p>$Id$ </p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Tue, 19 Dec 2017 18:14:02 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:8603:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"9mkgAe5UxQrfCOJjSvW6h6kU8y9iXs631Yzb642wWKHbK49R1EPXkN1oyrHdi1hv__qE2RjF2Q\">\n    <title>YAFFS talk - Slide 12 - Filesystem Data Structures | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"9mkgAe5UxQrfCOJjSvW6h6kU8y9iXs631Yzb642wWKHbK49R1EPXkN1oyrHdi1hv__qE2RjF2Q\">\n    <js-placeholder 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>YAFFS talk - Slide 12 - Filesystem Data Structures</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" 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We do this to enable functions like the text resize in the right hand column. If you want to delete any cookies that are already on your computer, please refer to the instructions for your file management software to locate the file or directory that stores cookies. Our cookies will have file names starting yaffs.net. These may be found among the Privacy settings for your web browser. Information on deleting or controlling cookies is available at the excellent and informative site:www.AboutCookies.org. Please note that by deleting our cookies or disabling future cookies you may not be able to access certain areas or features of our site.</p>\n\n<h3>Privacy</h3>\n\n<p>We, like all British companies handling data on computers, are registered under the Data Protection Act, which requires us (amongst many other things) to describe what use we shall make of the data we keep, and have the authorities record and accept that use, and permits you access to the data about you.</p>\n\n<p>In practice when we write an Invoice we do it on a computer and we keep the invoice details for a few months (and a paper copy much longer).</p>\n\n<p>We DO NOT EVER pass this information on, or sell it, to any other company. We never have done so and we expect never to do so in the future. Details of your transaction with us remain private to us and you can expect them to be seen only by our staff and possibly by our professional Auditors.</p>\n\n<p>We suffer enough from junk mail and junk email to wish not to inflict any of it on anyone else!</p>\n\n<p>We do not promise not to tell you if we have a new product we think you might be interested in. We very rarely do this but we might at some future time want to tell you about what is both new and likely to be relevant to you.</p>\n\n<p>We do also run an Email list for Yaffs, but you only receive emails if you ask to do so by going to:-  http://stoneboat.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs  to join in.</p>\n\n<h3>Guarantee</h3>\n\n<p>Our policy has always been to provide all the information a buyer needs to make an informed choice of our products. If you have questions to which you do not see answers we are happy to try to answer those specific questions; they are much more likely to be answered if you provide information about the software context in which you are using Yaffs and details of the kind of difficulty you have</p>\n\n<p>Yaffs is provided on an \"as is\" basis without any warranty as to its suitability for any particular purpose. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Tue, 14 Nov 2017 11:03:52 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:8764:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"CHA6hxuL4ixLPWah2PopnSi7TobykayFXgCCxgy9NnvlN4q1w6WxuAejTBk4JMLOUnxUeieacA\">\n    <title>The Internal History of YAFFS | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"CHA6hxuL4ixLPWah2PopnSi7TobykayFXgCCxgy9NnvlN4q1w6WxuAejTBk4JMLOUnxUeieacA\">\n    <js-placeholder token=\"CHA6hxuL4ixLPWah2PopnSi7TobykayFXgCCxgy9NnvlN4q1w6WxuAejTBk4JMLOUnxUeieacA\">\n  </head>\n  <body class=\"fontyourface path-node page-node-type-article navbar-is-fixed-top has-glyphicons\">\n    <a href=\"#main-content\" class=\"visually-hidden focusable skip-link\">\n      Skip to main content\n    </a>\n    <div style=\"background-color: ; color: \" id=\"environment-indicator\">\n  \n    </div>\n\n              <header class=\"navbar navbar-default navbar-fixed-top\" id=\"navbar\" role=\"banner\">\n              <div class=\"container\">\n            <div class=\"navbar-header\">\n          <div class=\"region region-navigation\">\n          <a class=\"logo navbar-btn pull-left\" href=\"/\" title=\"Home\" rel=\"home\">\n      <img src=\"/themes/custom/yaffs/logo.svg\" alt=\"Home\" />\n    </a>\n      \n  </div>\n\n                          <button type=\"button\" class=\"navbar-toggle\" data-toggle=\"collapse\" data-target=\"#navbar-collapse\">\n            <span class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label sr-only\">Search</label>\n  \n  \n  <div class=\"input-group\"><input title=\"Enter the terms you wish to search for.\" data-drupal-selector=\"edit-keys\" class=\"form-search form-control\" placeholder=\"Search\" type=\"search\" id=\"edit-keys\" name=\"keys\" value=\"\" size=\"15\" maxlength=\"128\" data-toggle=\"tooltip\" /><span class=\"input-group-btn\"><button type=\"submit\" value=\"Search\" class=\"button js-form-submit form-submit btn-primary btn icon-only\" name=\"\"><span class=\"sr-only\">Search</span><span class=\"icon glyphicon glyphicon-search\" aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">The Internal History of YAFFS</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/internal-history-yaffs\" typeof=\"schema:Article\" class=\"article is-promoted full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"The Internal History of YAFFS\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">The following archive documents will give you some insight into the internal history of YAFFS\n<ul>\n<li><a href=\"/node/39\">YAFFS Development notes</a>.</li>\n<li><a href=\"/node/42\">State of NAND MTD driver at start of project</a></li>\n<li><a href=\"/node/42\">YAFFS History</a></li>\n</ul>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Wed, 22 Nov 2017 06:10:20 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9202:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"U35o7UZSPtxc4LH7kWkWQNblavi4MdXJugJBaCe0rroGvLnoJ1r4SehLgeM5UA_sKnL2BfEnCQ\">\n    <title>A robust flash file system... | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"U35o7UZSPtxc4LH7kWkWQNblavi4MdXJugJBaCe0rroGvLnoJ1r4SehLgeM5UA_sKnL2BfEnCQ\">\n    <js-placeholder 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href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  A robust flash file system...\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>A robust flash file system...</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/features/robust-flash-file-system\" class=\"what-is-special-about-yaffs is-promoted full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n  <div class=\"field field--name-field-icon-text field--type-string field--label-above\">\n    <div class=\"field--label\">Icon - text</div>\n              <div class=\"field--item\">fa-shield</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>As part of our regular testing, we run power-fail tests. Whether it\'s during a read or a write, Yaffs is designed to preserve your existing data during a device power failure. And because Yaffs is open source, you can download the tests and run them yourself in the most severe conditions you expect the product to encounter. See:- http://www.yaffs.net/documents/yaffs-robustness-and-testing</p></div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Thu, 16 Nov 2017 06:24:40 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9493:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"ebG4-NupXU2bjCskSgRRNKgyB7ELBx1Au7nfPJMbhToWBhHjBirBi0g_-80ubAKQpAA0wfKzBQ\">\n    <title>Memory efficiency | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"ebG4-NupXU2bjCskSgRRNKgyB7ELBx1Au7nfPJMbhToWBhHjBirBi0g_-80ubAKQpAA0wfKzBQ\">\n    <js-placeholder 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class=\"control-label sr-only\">Search</label>\n  \n  \n  <div class=\"input-group\"><input title=\"Enter the terms you wish to search for.\" data-drupal-selector=\"edit-keys\" class=\"form-search form-control\" placeholder=\"Search\" type=\"search\" id=\"edit-keys\" name=\"keys\" value=\"\" size=\"15\" maxlength=\"128\" data-toggle=\"tooltip\" /><span class=\"input-group-btn\"><button type=\"submit\" value=\"Search\" class=\"button js-form-submit form-submit btn-primary btn icon-only\" name=\"\"><span class=\"sr-only\">Search</span><span class=\"icon glyphicon glyphicon-search\" aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Memory efficiency\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>Memory efficiency</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/features/memory-efficiency\" class=\"what-is-special-about-yaffs is-promoted full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n  <div class=\"field field--name-field-icon-text field--type-string field--label-above\">\n    <div class=\"field--label\">Icon - text</div>\n              <div class=\"field--item\">fa-sort-amount-asc</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p>Yaffs has a lower memory footprint than most other log-structured Flash file systems.&nbsp; Because it is log-structured, RAM is required to build up runtime data structures for acceptable performance. As a rule of thumb, Yaffs uses approximately 2 bytes per chunk of NAND flash, where a chunk is typically one page of NAND. For NAND with 512byte pages, a budget of approximately 4kbytes of RAM per 1Mbyte of NAND is usually sensible. And for 2kbyte page devices a budget of approximately 1kbyte per 1Mbyte of NAND usually suffices.</p>\n<p>You can find out details of Yaffs memory use in the document&nbsp; <a href=\"http://www.yaffs.net/documents/how-yaffs-works\">http://www.yaffs.net/documents/how-yaffs-works</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Tue, 13 Feb 2018 03:31:32 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:10661:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"KtW6PAQ36OcjNhaJ2qcE43Xf7CaTYWWKIVZIzZT3yIOYNsGecnQxlKBm2NOBDDb8wI7mVhfUfw\">\n    <title>Get Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"KtW6PAQ36OcjNhaJ2qcE43Xf7CaTYWWKIVZIzZT3yIOYNsGecnQxlKBm2NOBDDb8wI7mVhfUfw\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label sr-only\">Search</label>\n  \n  \n  <div class=\"input-group\"><input title=\"Enter the terms you wish to search for.\" data-drupal-selector=\"edit-keys\" class=\"form-search form-control\" placeholder=\"Search\" type=\"search\" id=\"edit-keys\" name=\"keys\" value=\"\" size=\"15\" maxlength=\"128\" data-toggle=\"tooltip\" /><span class=\"input-group-btn\"><button type=\"submit\" value=\"Search\" class=\"button js-form-submit form-submit btn-primary btn icon-only\" name=\"\"><span class=\"sr-only\">Search</span><span class=\"icon glyphicon glyphicon-search\" aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Sun, 11 Feb 2018 13:47:15 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:10661:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"GYUQ-bJ7qZ1PGDEzYNI-ZhHOx51Twv00ufMvCxgHlffJuPLCUYMr_KIKqYwekhQ89Kr8pReG2A\">\n    <title>Get Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"GYUQ-bJ7qZ1PGDEzYNI-ZhHOx51Twv00ufMvCxgHlffJuPLCUYMr_KIKqYwekhQ89Kr8pReG2A\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label sr-only\">Search</label>\n  \n  \n  <div class=\"input-group\"><input title=\"Enter the terms you wish to search for.\" data-drupal-selector=\"edit-keys\" class=\"form-search form-control\" placeholder=\"Search\" type=\"search\" id=\"edit-keys\" name=\"keys\" value=\"\" size=\"15\" maxlength=\"128\" data-toggle=\"tooltip\" /><span class=\"input-group-btn\"><button type=\"submit\" value=\"Search\" class=\"button js-form-submit form-submit btn-primary btn icon-only\" name=\"\"><span class=\"sr-only\">Search</span><span class=\"icon glyphicon glyphicon-search\" aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Sat, 03 Feb 2018 15:06:36 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:10661:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"yPmQBQDzMOgWhYhekegqLjNEMOccGPWqf9RxrDsXqv_8RQE-BHU2wTdRr__vIgVrSPKLn3yp2A\">\n    <title>Get Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"yPmQBQDzMOgWhYhekegqLjNEMOccGPWqf9RxrDsXqv_8RQE-BHU2wTdRr__vIgVrSPKLn3yp2A\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Mon, 12 Feb 2018 06:08:41 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:10661:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"t4QRByp_oNLBMoW01r_FTCvx3xsN9mF1xX3Mz0-ACgtuoLKelvKRkXkMcxgSaODNvT2MuD0hvw\">\n    <title>Get Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"t4QRByp_oNLBMoW01r_FTCvx3xsN9mF1xX3Mz0-ACgtuoLKelvKRkXkMcxgSaODNvT2MuD0hvw\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Fri, 23 Feb 2018 09:02:39 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:10661:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"PNbwiT1Avg-fktoYj6S_ME-zL4fV4X9XsANidd2LRT9xOSBSeD2K95BY0WQ9oMDAdzX7ynpLAQ\">\n    <title>Get Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"PNbwiT1Avg-fktoYj6S_ME-zL4fV4X9XsANidd2LRT9xOSBSeD2K95BY0WQ9oMDAdzX7ynpLAQ\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Tue, 14 Nov 2017 10:55:48 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:10661:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"t90utgP3MFhYnGQkR8NqyUVyAdDVzqrBbY7Xc0HD_8QY-NQwXIX5jvS6KailLBbnCHK8oA7xeA\">\n    <title>Get Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"t90utgP3MFhYnGQkR8NqyUVyAdDVzqrBbY7Xc0HD_8QY-NQwXIX5jvS6KailLBbnCHK8oA7xeA\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Sun, 18 Feb 2018 18:10:59 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:10661:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"IoIhNDRs2wb0mgfuh8sAMOZPF6QerixbvqVSHZ8DE7umy2GSBJHN8MNgfoUrXHm1zMMfJNVLPg\">\n    <title>Get Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"IoIhNDRs2wb0mgfuh8sAMOZPF6QerixbvqVSHZ8DE7umy2GSBJHN8MNgfoUrXHm1zMMfJNVLPg\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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