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Definitions:</p>\n<p>ALEPH ONE LIMITED - An English company, Registered Number 1017960, of The Old Courthouse, 123 High Street, Bottisham, Cambridge CB25 9BA UK.</p>\n<p>SOURCE CODE - Code owned by Aleph One Ltd and supplied under this Licence</p>\n<p>BINARY CODE - Code which has been compiled from SOURCE CODE</p>\n<p>LICENCE-HOLDER - The firm represented by the person who signs this Agreement. Each Licence bears the Name and Address of a particular LICENCE HOLDER.</p>\n<p>YAFFS FILESYSTEMS - any Filesystem Images made using YAFFS SOURCE CODE or YAFFS BINARY CODE.</p>\n<p>PRODUCT will be defined precisely at the time of negotiation of the sale of the Licence. See section 3 for the principles used in defining PRODUCT</p>\n<p>2. The Licence:</p>\n<p>Allows the LICENCE-HOLDER to use Aleph One\'s software to create the File System, FS and incorporate the FS in the defined Products.</p>\n<p>Entitles the LICENCE-HOLDER to distribute BINARY CODE compiled from the SOURCE CODE provided.</p>\n<p>Does not entail any obligation to reveal the BINARY CODE.</p>\n<p>Prohibits the LICENCE-HOLDER from releasing the SOURCE CODE to other parties, except to the extent necessary to permit sub-contractors to work with the LICENCE-HOLDER on a project using the code. The LICENCE-HOLDER is responsible for ensuring compliance with all the terms of this Licence by any sub-contractor used.</p>\n<p>Is only available in a non-exclusive form.</p>\n<p>Is applicable worldwide.</p>\n<p>Has no time limit or per-unit royalty, but a fixed price paid upon signature of the Licence Agreement.&nbsp; From 1 August 2012 the base price (for one Product) is GB£10,000. Sterling</p>\n<p>Applies to use of the FS for one PRODUCT rather than to a company/user/person. It cannot be transferred to another PRODUCT.</p>\n<p>Provides the SOURCE CODE and any derived FILESYSTEMS without any warranty but &gt;AS IS&lt; save that (to the best of Aleph One\'s knowledge) the use of the SOURCE CODE does not infringe the intellectual propert rights of any third party.</p>\n<p>3. Supporting information and Terms relating to use:</p>\n<p>This Licence supplies:</p>\n<p>Free access to all documentation written for YAFFS by Aleph One, at <a href=\"http://www.yaffs.net\">http://www.yaffs.net</a></p>\n<p>Certain pieces of software, with different Licences attached to them:-</p>\n<p>SOURCE CODE for YAFFS/direct and Bootloader, being the subject of this Licence agreement, for incorporation in a PRODUCT.</p>\n<p>YAFFS Development Tools; images created with the tools may be incorporated into a product. The images are not affected by the licence status of the tools.&nbsp; When these Tool files are supplied in the tarball we send, they will appear with a header saying they are used under the GNU General Public Licence, version 2.&nbsp; That term applies only to the Tools; the other files in the tarball will have headers making clear they are used under a paid Licence from Aleph One Ltd.</p>\n<p>Source code modifications and enhancements made by the LICENCE-HOLDER remain the property of LICENCE-HOLDER, but may not be redistributed or sold to third parties by LICENCE-HOLDER without the consent of Aleph One.</p>\n<p>PRODUCT DEFINITION<br />\n<br />\nA Yaffs Licence Agreement requires the definition of the Product to which it applies.&nbsp; We do this with a brief description of its purpose, and the hardware in terms of the type or family of chips used as CPU or MCU, and any internal Code Name or Product name or SKU that you use for it.<br />\nLater changes to the PCB which are evolutionary do not create a fresh Product, nor do changes in the size or speed of those chips or of the I/O technology.</p>\n<p>Discussion with Aleph One about licensing further Products is required where:</p>\n<ul>\n<li>A new PCB or key CPU or MCU is used, or</li>\n<li>You sell chip designs and no hardware, or</li>\n<li>You sell a Development Board with SDK to customers who will integrate&nbsp;Yaffs into their Products, or</li>\n<li>Changes in the brand name or badge are made, or</li>\n<li>Your rights to the Product pass to a new owner.</li>\n</ul>\n<p>Following payment for the Licence Aleph One will provide a tarball with file headers showing that the code is being used by the LICENCE-HOLDER under a paid Licence from Aleph One.</p>\n<ul>\n<li>Version 24 - September 2015</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 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 13:03:03 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:18212:\"<!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=\"ubvqt4EDMq2Hp-axzceyJwJFYg5r3C3u8JG6UVmy84RdLviMzBvIzu-DP5kd8JzWEUVLMaxzcA\">\n    <title>Yaffs 2 Specification | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"ubvqt4EDMq2Hp-axzceyJwJFYg5r3C3u8JG6UVmy84RdLviMzBvIzu-DP5kd8JzWEUVLMaxzcA\">\n    <js-placeholder token=\"ubvqt4EDMq2Hp-axzceyJwJFYg5r3C3u8JG6UVmy84RdLviMzBvIzu-DP5kd8JzWEUVLMaxzcA\">\n  </head>\n  <body class=\"fontyourface path-node page-node-type-page 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 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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\">Yaffs 2 Specification</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=\"/yaffs-2-specification\" typeof=\"schema:WebPage\" class=\"page is-sticky full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Yaffs 2 Specification\" 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>Summary</h2>\n<p>The original motivation for Yaffs 2 was to add support for the new NAND with 2kB pages instead of 512-byte pages and strictly sequential page writing order.</p>\n<p>To achieve this, a new design is used which also realises the following benefits:</p>\n<ul>\n<li>\n<p>Zero page rewrites means faster operation. (Yaffs1 uses a single rewrite in the spare area to delete a page).</p>\n </li>\n<li>\n<p>Ability to exploit simultaneous page programming on some chips.</p>\n </li>\n<li>\n<p>Improves performance relative to Yaffs1 speed(write:1.5x to 5x, delete: 4x, garbage collection: 2x)</p>\n </li>\n<li>\n<p>Lower RAM footprint (approx. 25% to 50% of Yaffs1).</p>\n </li>\n<li>\n<p>Can support Toshiba/Sandisk MLC parts.</p>\n </li>\n</ul>\n<p>Most of Yaffs1 and Yaffs2 code is common, therefore the code will likely be kept common with Yaffs1 vs Yaffs2 being run-time selected.</p>\n<h4>Method</h4>\n<p>The main philosophical difference between Yaffs&nbsp;and Yaffs2 is how discarded status is tracked. Since we can\'t do any re-writing, we can\'t use the \"discarded\" flags in Yaffs2.</p>\n<p>Instead Yaffs2 uses two mechanisms to resolve data state.</p>\n<ul>\n<li>\n<p>Yaffs2 chunks have more tag information, including a block sequence Id. From that we can determine the chunk sequence Id since the chunks are allocated sequentially in a block. Thus we always know the patch order for all chunks in the system.</p>\n </li>\n<li>\n<p>The above helps us track stale -vs- fresh data, but does not help determine when a file/object is deleted. Deletion is achieved by moving the object to the \"unlinked\" directory. We also keep track of the number of chunks (both stale and current) in the system for each object. While this number indicates that there are still chunks associated with this object we keep the deletion record. When the last trace of the object has been really erased from NAND, we can forget about the deletion record too.</p>\n </li>\n<li>\n<p>Since there is no deletion, a resize (shrinking) of a file will still have valid data chunks past the end of file on the NAND. However, we write a new ObjectHeader at the time of the resize, therefore this shows the shrunken file size.</p>\n </li>\n</ul>\n<p>This changes erasure slightly:</p>\n<ul>\n<li>\n<p>During garbage collection we can\'t just look at chunk state flags, instead we must read the tags of each chunk to determine which object\'s chunk count we must decrement. This step must also be performed when a block is erased (as part of deletion).</p>\n </li>\n</ul>\n<p>This makes erasure &amp; garbage collection more expensive (by adding reads), but remember that ion Yaffs2 we don\'t need to do page deletions which are much more expensive operations. Thus, all-up Yaffs2 wins.</p>\n<h4>Tag structure</h4>\n<p>Each chunk in Yaffs2 has the following information:</p>\n<p>Field</p>\n<p>Comment</p>\n<p>Size for 1kb chunks</p>\n<p>Size for 2kB chunks</p>\n<table>\n<tbody>\n <tr>\n </tr>\n <tr>\n  <td>\n  <p>blockState</p>\n   </td>\n  <td>\n  <p>Block state. non-0xFF for bad block</p>\n   </td>\n  <td>\n  <p>1 byte</p>\n   </td>\n  <td>\n  <p>1 byte</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>chunkId</p>\n   </td>\n  <td>\n  <p>32-bit chunk Id</p>\n   </td>\n  <td>\n  <p>4 bytes</p>\n   </td>\n  <td>\n  <p>4 bytes</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>objectId</p>\n   </td>\n  <td>\n  <p>32-bit object Id</p>\n   </td>\n  <td>\n  <p>4 bytes</p>\n   </td>\n  <td>\n  <p>4 bytes</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>nBytes</p>\n   </td>\n  <td>\n  <p>Number of data bytes in this chunk</p>\n   </td>\n  <td>\n  <p>2 bytes</p>\n   </td>\n  <td>\n  <p>2 bytes</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>blockSequence</p>\n   </td>\n  <td>\n  <p>sequence number for this block</p>\n   </td>\n  <td>\n  <p>4 bytes</p>\n   </td>\n  <td>\n  <p>4 bytes</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>tagsEcc</p>\n   </td>\n  <td>\n  <p>ECC on tags area</p>\n   </td>\n  <td>\n  <p>3 bytes</p>\n   </td>\n  <td>\n  <p>3 bytes</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>ecc</p>\n   </td>\n  <td>\n  <p>ECC, 3 bytes/256 bytes of data</p>\n   </td>\n  <td>\n  <p>12 bytes</p>\n   </td>\n  <td>\n  <p>24 bytes</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p><strong>Total</strong></p>\n   </td>\n  <td>\n  <p>&nbsp;</p>\n   </td>\n  <td>\n  <p><strong>30 bytes</strong></p>\n   </td>\n  <td>\n  <p><strong>42 bytes</strong></p>\n   </td>\n </tr>\n</tbody>\n</table>\n<p><br />\n&nbsp;</p>\n<p>To get enough spare bytes for this tagging structure requires a chunk-size of at least 1kB.</p>\n<p>The blockSequence increments each time a block is allocated. (ie. the first block allocated is block 1, and so on).</p>\n<h4>Scanning</h4>\n<p>The only reason we need to keep track of data status on NAND is to be able to recreate the file system state during scanning. Since we no longer have chunk deletion status flags we use a slightly different process for scanning a Yaffs2 system.</p>\n<p>In effect, Yaffs2 recreates its state by \"replaying the tape\". ie. it scans the chunks in their allocation order (block sequence Id order) rather than in their order on the media. This implies that at start up, the blocks must be read and their block sequence determined.</p>\n<h4>Performance</h4>\n<p>Times for 2kB read(units of 1uS).</p>\n<p>Operation</p>\n<p>Yaffs1</p>\n<p>Yaffs2 (512b pages)</p>\n<p>Yaffs2 (2kB pages)</p>\n<p>Yaffs2(2kB pages, x16)</p>\n<table>\n<tbody>\n <tr>\n </tr>\n <tr>\n  <td>\n  <p>Seek</p>\n   </td>\n  <td>\n  <p>40</p>\n   </td>\n  <td>\n  <p>40</p>\n   </td>\n  <td>\n  <p>10</p>\n   </td>\n  <td>\n  <p>10</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Read</p>\n   </td>\n  <td>\n  <p>220</p>\n   </td>\n  <td>\n  <p>220</p>\n   </td>\n  <td>\n  <p>220</p>\n   </td>\n  <td>\n  <p>110</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Total</p>\n   </td>\n  <td>\n  <p>260</p>\n   </td>\n  <td>\n  <p>260</p>\n   </td>\n  <td>\n  <p>230</p>\n   </td>\n  <td>\n  <p>120</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>MB/s</p>\n   </td>\n  <td>\n  <p>7.6</p>\n   </td>\n  <td>\n  <p>7.6</p>\n   </td>\n  <td>\n  <p>8.7</p>\n   </td>\n  <td>\n  <p>16.7</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Relative speed</p>\n   </td>\n  <td>\n  <p>1</p>\n   </td>\n  <td>\n  <p>1</p>\n   </td>\n  <td>\n  <p>1.1</p>\n   </td>\n  <td>\n  <p>2.2</p>\n   </td>\n </tr>\n</tbody>\n</table>\n<p><br />\n&nbsp;</p>\n<p>Times for 2kB writes(units of 1uS).</p>\n<p>Operation</p>\n<p>Yaffs1</p>\n<p>Yaffs2 (512b pages)</p>\n<p>Yaffs2 (2kB pages)</p>\n<p>Yaffs2(2kB pages, x16)</p>\n<table>\n<tbody>\n <tr>\n </tr>\n <tr>\n  <td>\n  <p>Seek</p>\n   </td>\n  <td>\n  <p>40</p>\n   </td>\n  <td>\n  <p>40</p>\n   </td>\n  <td>\n  <p>10</p>\n   </td>\n  <td>\n  <p>10</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Program</p>\n   </td>\n  <td>\n  <p>800</p>\n   </td>\n  <td>\n  <p>800</p>\n   </td>\n  <td>\n  <p>200</p>\n   </td>\n  <td>\n  <p>200</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Seek</p>\n   </td>\n  <td>\n  <p>40</p>\n   </td>\n  <td>\n  <p>40</p>\n   </td>\n  <td>\n  <p>10</p>\n   </td>\n  <td>\n  <p>10</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Read</p>\n   </td>\n  <td>\n  <p>220</p>\n   </td>\n  <td>\n  <p>220</p>\n   </td>\n  <td>\n  <p>220</p>\n   </td>\n  <td>\n  <p>110</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Total</p>\n   </td>\n  <td>\n  <p>1320</p>\n   </td>\n  <td>\n  <p>1320</p>\n   </td>\n  <td>\n  <p>660</p>\n   </td>\n  <td>\n  <p>440</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>MB/s</p>\n   </td>\n  <td>\n  <p>1.5</p>\n   </td>\n  <td>\n  <p>1.5</p>\n   </td>\n  <td>\n  <p>3</p>\n   </td>\n  <td>\n  <p>4.5</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Relative speed</p>\n   </td>\n  <td>\n  <p>1</p>\n   </td>\n  <td>\n  <p>1</p>\n   </td>\n  <td>\n  <p>2</p>\n   </td>\n  <td>\n  <p>3</p>\n   </td>\n </tr>\n</tbody>\n</table>\n<p><br />\n&nbsp;</p>\n<p>Times for 1MB delete (units of 1uS).</p>\n<p>Operation</p>\n<p>Yaffs1</p>\n<p>Yaffs2 (512b pages)</p>\n<p>Yaffs2 (2kB pages)</p>\n<p>Yaffs2(2kB pages, x16)</p>\n<table>\n<tbody>\n <tr>\n </tr>\n <tr>\n  <td>\n  <p>Seek</p>\n   </td>\n  <td>\n  <p>20480</p>\n   </td>\n  <td>\n  <p>0</p>\n   </td>\n  <td>\n  <p>0</p>\n   </td>\n  <td>\n  <p>0</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Program</p>\n   </td>\n  <td>\n  <p>409600</p>\n   </td>\n  <td>\n  <p>0</p>\n   </td>\n  <td>\n  <p>0</p>\n   </td>\n  <td>\n  <p>0</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Erase</p>\n   </td>\n  <td>\n  <p>128000</p>\n   </td>\n  <td>\n  <p>128000</p>\n   </td>\n  <td>\n  <p>16000</p>\n   </td>\n  <td>\n  <p>16000</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Total</p>\n   </td>\n  <td>\n  <p>558080</p>\n   </td>\n  <td>\n  <p>128000</p>\n   </td>\n  <td>\n  <p>16000</p>\n   </td>\n  <td>\n  <p>16000</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>MB/s</p>\n   </td>\n  <td>\n  <p>1.8</p>\n   </td>\n  <td>\n  <p>7.8</p>\n   </td>\n  <td>\n  <p>62.5</p>\n   </td>\n  <td>\n  <p>62.5</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Relative speed</p>\n   </td>\n  <td>\n  <p>1</p>\n   </td>\n  <td>\n  <p>4</p>\n   </td>\n  <td>\n  <p>34</p>\n   </td>\n  <td>\n  <p>34</p>\n   </td>\n </tr>\n</tbody>\n</table>\n<p><br />\n&nbsp;</p>\n<p>Times for 1MB of garbage collection at 50% dirty (units of 1uS).</p>\n<p>Operation</p>\n<p>Yaffs1</p>\n<p>Yaffs2 (512b pages)</p>\n<p>Yaffs2 (2kB pages)</p>\n<p>Yaffs2(2kB pages, x16)</p>\n<table>\n<tbody>\n <tr>\n </tr>\n <tr>\n  <td>\n  <p>Delete 1MB</p>\n   </td>\n  <td>\n  <p>558080</p>\n   </td>\n  <td>\n  <p>128000</p>\n   </td>\n  <td>\n  <p>16000</p>\n   </td>\n  <td>\n  <p>16000</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Write 0.5MB</p>\n   </td>\n  <td>\n  <p>337920</p>\n   </td>\n  <td>\n  <p>337920</p>\n   </td>\n  <td>\n  <p>168960</p>\n   </td>\n  <td>\n  <p>112640</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>Total</p>\n   </td>\n  <td>\n  <p>896000</p>\n   </td>\n  <td>\n  <p>465920</p>\n   </td>\n  <td>\n  <p>184960</p>\n   </td>\n  <td>\n  <p>128640</p>\n   </td>\n </tr>\n <tr>\n  <td>\n  <p>MB/s</p>\n   </td>\n  <td>\n  <p>1.1</p>\n   </td>\n  <td>\n  <p>2.1</p>\n   </td>\n  <td>\n  <p>5.4</p>\n   </td>\n  <td>\n  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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 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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 24 - Performance - Caching</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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\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: the NAND-specific flash file system - Introductory Article</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/yaffs-nand-specific-flash-file-system-introductory-article\" class=\"book is-promoted is-sticky full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">Written by Charles Manning - Originally published at Linuxdevices.org Sept 20th 2002\n<h3>PHB Summary</h3>\nYAFFS stands for \"yet another flash file system\"(*). As far as I am aware, YAFFS is the only file system, under any operating system, that has been designed specifically for use with NAND flash. YAFFS is thus designed to work within the constraints of, and exploit the features of, NAND flash to maximise performance. YAFFS uses journaling, error correction and verification techniques tuned to the way NAND typically fails, to enhance robustness. The result is a file system that exploits low-cost NAND chips and is both fast and robust. YAFFS is highly portable and runs under Linux, ucLinux and Windows CE. YAFFS is an open source project.\n<h3>Why NAND flash?</h3>\nEmbedded and mobile systems are increasingly using NAND flash for storage because it has various advantages over other storage technologies. As always though, life is a compromise and those advantages come with some limitations that need to be addressed to provide a robust flash file system. Hard disks are not a viable storage option for many embedded and handheld systems because they are too big, too fragile and use too much power. For some years now, people have been using common-old NOR flash for file system storage. JFFS and JFFS2 do an excellent job of this for Linux. For storage applications NOR flash is not that great because it is not very dense (ie. not much storage per chip), is costly and is slow to write. NAND flash, on the other hand, is low cost, dense and writes fast, but has other limitations. The most common consumer usage of NAND flash is on SmartMedia cards which are just NAND chips bonded to a carrier card. Consumer use of SmartMedia is driving down NAND prices while driving up densities. The standard SmartMedia file system is FAT based and is thus liable to corruptions due to power failures, crashes and other acts of demonic forces. This raises robustness concerns, particularly in embedded systems where a corrupted file system can kill the device. What\'s really needed is a journaling file system that is able to work around the limitations of NAND and exploit it for best performance.\n<h3>History</h3>\nThe lead-up to YAFFS started with an investigation into modifying the JFFS2 flash file system to work with NAND flash (**) for some Aleph One customers. It seemed reasonable that the best way to get a file system for NAND flash would be just \"tweaking\" an existing flash file system. On deeper investigation, it became apparent that designing a new file system specifically for NAND might have some benefits.\n<table border=\"1\" cellpadding=\"1\" style=\"width: 568px; border-color: #000000; border-spacing: 0px;\">\n<col width=\"186\" /><col width=\"187\" /><col width=\"186\" />\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p></p>\n </td>\n <td style=\"width: 187px;\">\n <p>NOR (typical, varies a lot)</p>\n </td>\n <td style=\"width: 186px;\">\n <p>NAND</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Density</p>\n </td>\n <td style=\"width: 187px;\">\n <p>Up to 32MB chips</p>\n </td>\n <td style=\"width: 186px;\">\n <p>Currently 256MB and growing.</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Cost per MB</p>\n </td>\n <td style=\"width: 187px;\">\n <p>$1-$2</p>\n </td>\n <td style=\"width: 186px;\">\n <p>25c</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Access</p>\n </td>\n <td style=\"width: 187px;\">\n <p>Random</p>\n </td>\n <td style=\"width: 186px;\">\n <p>Page oriented with spare area on each page. Sequential access within a page.</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Programmability</p>\n </td>\n <td style=\"width: 187px;\">\n <p>Can modify a single bit.</p>\n </td>\n <td style=\"width: 186px;\">\n <p>Very limited re-programming.</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Read speed</p>\n </td>\n <td style=\"width: 187px;\">\n <p>50-100nS</p>\n </td>\n <td style=\"width: 186px;\">\n <p>10uS page \"seek\" + 50nS per byte</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Program time</p>\n </td>\n <td style=\"width: 187px;\">\n <p>5uS per byte</p>\n </td>\n <td style=\"width: 186px;\">\n <p>200uS per page</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Erasure time</p>\n </td>\n <td style=\"width: 187px;\">\n <p>1s per 64kB block</p>\n </td>\n <td style=\"width: 186px;\">\n <p>2ms per 16kB block</p>\n </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"width: 186px;\">\n <p>Reliability</p>\n </td>\n <td style=\"width: 187px;\">\n <p>Relatively immune to corruption. No bad blocks.</p>\n </td>\n <td style=\"width: 186px;\">\n <p>Needs error correction. Bad blocks marked when shipped.</p>\n </td>\n</tr>\n</table>\nDesigning an effective flash file system is a difficult task and you need to jump through many hoops of fire to get a useful system. Although both are called \"Flash\", NOR and NAND flash have very different properties. Thus, a flash file system that works with NOR incorporates various mechanisms that are not required for NAND, and NAND needs extra mechanisms not required for NOR. For example, garbage collection performance is largely determined by the erasure time. NOR erases very slowly and thus an effective NOR garbage collection strategy is relatively complex and limits the design options. In comparison NAND erases very quickly; thus these limitations don\'t apply. Another major difference is that NAND is shipped with marked bad blocks on the device, while NOR chips are shipped defect free. Thus, one expects to encounter some failures in NAND and should design accordingly. This lead me to believe that it would be worth designing a file system specifically for NAND flash, exploiting the features of NAND to simplify the design and catering to NAND specific limitations directly, rather than trying to \"bend\" NAND to work with an existing file system architecture, or vice versa. The first conceptual design for YAFFS was drawn up in late December 2001. Once the customers bought in to the idea, things progressed rapidly. The first line of code was cut in January 2002. By May 2002 we had the first publicly available CVS code. We now have at least six different companies using or experimenting with YAFFS in embedded or handheld systems. YAFFS is already very stable and is converging rapidly. We expect to see YAFFS-based products shipped before the end of the year.\n<h3>Design approach</h3>\nRather than develop and debug code inside the Linux kernel, I took the approach of developing the file system \"guts\" algorithms - the most complex part -- in a user space program. To achieve this, the code is split into four sections:\n<ul>\n<li>\n<p>yaffs_guts: The file system algorithms. This code is fully portable C.</p>\n </li>\n<li>\n<p>yaffs_fs.c: Interface layer to the Linux VFS. Can be replaced with a test harness for user space developing of yaffs_guts.c</p>\n </li>\n<li>\n<p>nand interface: wrapper layer between yaffs_guts and the NAND memory access functions. eg. calls Linux mtd layer or RAM emulation layer.</p>\n </li>\n<li>\n<p>Portability functions: wrapper functions for services such as memory allocation etc.</p>\n </li>\n</ul>\nThis modular design has provided a lot of flexibility for testing and development. A user space program and DDD is a far more rapid development environment than continually changing the Linux kernel. Also, a RAM-based NAND emulation layer provides an excellent way to debug the file system in-kernel without special hardware. A further spin-off has been that YAFFS is portable to other operating systems. For example, a port of YAFFS for Windows CE was readily achieved by writing a new wrapper layer to hook up to the WinCE file system manager and new NAND access layer. yaffs_guts.c remains 100% portable(***). YAFFS is thus likely to be easily portable to other OSs too.\n<h3>Results</h3>\nRemoving surplus constraints has lead to a simpler design that has improved performance and robustness as well and reduced development time. YAFFS reads and writes pretty fast. There is no significant hit due to garbage collection (ie. in most situations garbage collection overheads would not impact usage). It is difficult to give meaningful benchmarks given non-standard hardware. However herewith some results achieved on a StrongARM-based board with 128MB of NAND flash. Write speed is approx 800kB per second and read speed is approx 1.5MB per second. In a weekend stress test I wrote, triple-verified then deleted 25gigabytes of file data without a single bit of file data being corrupted. 25GB exceeds the design lifetime of most embedded or handheld devices.\n<h3>Future</h3>\nAlthough YAFFS already performs well, there is still a lot of room for improvement. Development is continuing to enhance performance and robustness as well as add support software such as utilities, bootloader support and analysis tools. I expect to see ports to other OSs too. Increasing the user base of YAFFS is an important way to get more eyes over the code and test it under a wider set of scenarios. The YAFFS development community is growing well with good involvement from people all over the world. YAFFS is realising all the benefits open source projects hope for and will, we expect, continue to grow.\n<h3>Resources</h3>\nThe YAFFS project home page is <a href=\"http://www.aleph1.co.uk/yaffs/\">http://www.aleph1.co.uk/yaffs/</a> This provides further YAFFS documentation and instructions for GIT access and the YAFFS mailing list.\n<h3>Footnotes:</h3>\n(*)The YAFFS name came from the first concept document proposing yet another flash file system. Some how that name just stuck. (**) NAND support has since been added to JFFS2 by others. The YAFFS, JFFS2 and mtd communities cooperate to provide a rich flexible set of solutions to draw from. As is the nature of open source projects, JFFS2 code was used as a reference for some parts of the YAFFS development, particularly for figuring out the VFS interface. Google for further info on JFFS2 and mtd. (***) Some features were added to the guts to enhance WinCE usage. For example, the string comparison function was made configurable to be either strcmp or scricmp because Windows file names are case insensitive.\n<h3>Bio</h3>\nCharles Manning (aka The Embedded Janitor) lives near Christchurch, New Zealand, and has been developing and mopping up embedded systems for twenty years. His hobbies include fly tying and spinning wool. Charles can be reached at <a href=\"denied:mailto:charles@aleph1.co.uk\">charles@aleph1.co.uk</a>. </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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As far as I am aware, YAFFS is the only file system, under any operating system, that has been designed specifically for use with NAND flash. YAFFS is thus designed to work within the constraints of, and exploit the features of, NAND flash to maximise performance. YAFFS uses journaling, error correction and verification techniques tuned to the way NAND typically fails, to enhance robustness. The result is a file system that exploits low-cost NAND chips and is both fast and robust. YAFFS is highly portable and runs under Linux, ucLinux and Windows CE. YAFFS is an open source project.\";}}i:1;s:11:\"description\";}i:3;a:2:{i:0;a:2:{s:4:\"#tag\";s:4:\"meta\";s:11:\"#attributes\";a:2:{s:4:\"name\";s:8:\"abstract\";s:7:\"content\";s:352:\"Yaffs (Yet Another Flash File System) is an open-source file system specifically designed to be fast, robust and suitable for embedded use with NAND and NOR Flash. 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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, 21 Nov 2017 14:01:56 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9224:\"<!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=\"TC69vS37_6aHNVzF0yYRkkVdG5D35T6CG3RaRdxJWN_qrUDdtCaFhDgxQe6qddgdtrpRrpLq2Q\">\n    <title>Tried and tested in millions of devices... | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"TC69vS37_6aHNVzF0yYRkkVdG5D35T6CG3RaRdxJWN_qrUDdtCaFhDgxQe6qddgdtrpRrpLq2Q\">\n    <js-placeholder 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 <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\" 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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                  Tried and tested in millions of devices...\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>Tried and tested in millions of devices...</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/tried-and-tested-millions-devices\" 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-mobile-phone</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Yaffs is the leading Flash file system, running in millions of devices. It\'s been used on Linux computers, in cameras, mobile phones, hard drives, and on many custom boards. People and companies trust it to keep their data safe. Read more about <a href=\"/documents/yaffs-robustness-and-testing\">how we test Yaffs in our Robustness and Testing white paper</a>.</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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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\" 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<article role=\"article\" about=\"/archives/paper-investigating-log-management-crash-recovery-mechanism\" typeof=\"schema:Article\" class=\"article full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Paper investigating a log management &amp; crash recovery mechanism\" 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\"><p><a href=\"http://www.cis.nctu.edu.tw/~lpchang/papers/SAC_wu_sac06.pdf\">This paper</a> proposes a method for efficient initialization and crash recovery for Flash-memory file systems. A log management scheme for the Flash-memory file systems is presented. The proposed log management method is implemented in a log-record manager and a logger. It was written by Chin-Hsein Wu, Tei-Wei Kuo and Li-Pen Change of the Department of Computer Science of National Taiwan University, Taipei, TAIWAN, and presented at an international SAC Conference in 2006. Copyright 2006 ACM 1-59593-108-2/06/0004</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:\"Sun, 26 Nov 2017 15:24:54 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9012:\"<!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=\"4tEL54XWC3nvAgzWiHjDjWjy_-M8u-CMLuw89UzgD3Gp5j60BZN702Su7mBLh9886ViSvSmr3A\">\n    <title>Predictable and performance oriented | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"4tEL54XWC3nvAgzWiHjDjWjy_-M8u-CMLuw89UzgD3Gp5j60BZN702Su7mBLh9886ViSvSmr3A\">\n    <js-placeholder 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 <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        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Predictable and performance oriented\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>Predictable and performance oriented</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/predictable-and-performance-oriented\" 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-plug</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 highly optimised and predictable garbage collection strategies. This makes it high performance and very deterministic when compared with similar file systems.</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 16:23:37 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:12322:\"<!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=\"4nOi4vrtGRGRY9NA1JP7iwwiTDr5IgqnghxnLzvhNFy6DEjo-UlqCK-qDKN0IbZRuS_8xx9kzg\">\n    <title>Preparing to build Linux with Yaffs | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"4nOi4vrtGRGRY9NA1JP7iwwiTDr5IgqnghxnLzvhNFy6DEjo-UlqCK-qDKN0IbZRuS_8xx9kzg\">\n    <js-placeholder token=\"4nOi4vrtGRGRY9NA1JP7iwwiTDr5IgqnghxnLzvhNFy6DEjo-UlqCK-qDKN0IbZRuS_8xx9kzg\">\n  </head>\n  <body class=\"fontyourface path-node page-node-type-help-video 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 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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>Preparing to build Linux with 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=\"/videos/preparing-build-linux-yaffs\" class=\"help-video full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n      <div class=\"field field--name-field-video field--type-video field--label-hidden field--items\">\n              <div class=\"field--item\"><video data-setup=\"{}\" class=\"video-js vjs-default-skin\" preload=\"none\" controls style=\"width:854px;height:480px;\" autoplay  >\n      <source src=\"https://yaffs.net/sites/default/files/videos/preparing-to-compile-linux-with-yaffs2.mp4\"/>\n  </video></div>\n          </div>\n  \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p> </p>\n\n<p>This video covers the preparation needed to include Linux in Yaffs - describing the kernel build-tools needed, how to get the kernel source code and Yaffs source code. It\'s about 175Mb and 6m30 long.</p>\n\n<p><em>Here\'s the script for the video:</em></p>\n\n<p>Hello, today I\'m going to show you the tools you need to compile Yaffs into the Linux kernel. If you\'ve compiled Linux before, then this tutorial is not appropriate for you, and you should skip to the next one.</p>\n\n<p>Yaffs is the most widely used file system which is specialised for Flash memory. It\'s used in millions of devices, both under Linux and other operatings systems. It\'s available under the GNU Public Licence – the GPL – and commercial terms. You can find out more about Yaffs at yaffs.net.</p>\n\n<p>This demo is being run on Intel x86 because the end result is available for you to experiment with under Vagrant and Virtualbox, but with some slight changes we could target another architecture – for instance ARM. If you\'ve never used Vagrant, it provides a way to get a virtual system up and running in a few minutes. You can download the Vagrant box from the Yaffs web site.</p>\n\n<p><em>Login</em></p>\n\n<p>We\'re starting off with a stock Ubunutu Precise 12.04 386 server. We\'re using 386 because it\'s the lowest common demoninator, so the virtualbox will run on any system capable of running Virtualbox, but this works just as well for 64 bit architecture.</p>\n\n<p>Here we are at the command-line of a brand-new installation. The server has been configured for the minimum – it only has ssh, and a couple of othre things required for Vagrant. Of course there\'s no requirement for any of this for Yaffs.</p>\n\n<p>We need git version control to download Yaffs and the kernel source</p>\n\n<p><strong>sudo apt-get install git</strong></p>\n\n<p>We need these tools to build the kernel</p>\n\n<p><strong>sudo apt-get install crash kexec-tools makedumpfile kernel-wedge</strong></p>\n\n<p><strong>sudo apt-get install ncurses-dev libncurses5-dev</strong></p>\n\n<p><strong>sudo apt-get install build-essential fakeroot</strong></p>\n\n<p>And we need this to automate the job of creating a debian kernel package</p>\n\n<p><strong>sudo apt-get install kernel-package</strong></p>\n\n<p>Okay, we have all the tools I\'ll be needing, so I\'m going to go ahead and make a working directory.</p>\n\n<p><strong>mkdir kernel</strong></p>\n\n<p><strong>cd kernel</strong></p>\n\n<p>Of course we\'re going to need Yaffs, so I\'ll go ahead and download that</p>\n\n<p><strong>git clone git://www.aleph1.co.uk/yaffs2</strong></p>\n\n<p>That puts it into the Yaffs directory.</p>\n\n<p><strong>ls</strong></p>\n\n<p>This copy of Yaffs is licensed under the GNU Public Licence – the GPL, so I must make changes available under the GPL too. We also license Yaffs under commercial terms, removing the need to make your code available to others. Check our website for details.</p>\n\n<p>Now I need a copy of the kernel source code. I could have used one directly from kernel.org, but because this demo is running on ubuntu, I\'m going to grab the ubuntu kernel. This has the benefit of including the debian build rules.</p>\n\n<p><strong>git clone git://kernel.ubuntu.com/ubuntu/ubuntu-precise.git source</strong></p>\n\n<p><strong>cd source</strong></p>\n\n<p>Here it is</p>\n\n<p><strong>ls</strong></p>\n\n<p>And that\'s everything necessary to build the kernel with Yaffs. In the next video we\'ll show you how to configure and compile the kernel with Yaffs. More information about Yaffs is available at www.yaffs.net. Thanks for watching.</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:\"Tue, 14 Nov 2017 15:44:12 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:13652:\"<!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=\"pwvqbFhizhqjRfhi1gVuY-HvKWW_SjAvbpa2ne2NJFemGRbLJQl1KCashfffM2w5z-6CWB-13A\">\n    <title>Test Yaffs under Linux using Virtualbox and Vagrant | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"pwvqbFhizhqjRfhi1gVuY-HvKWW_SjAvbpa2ne2NJFemGRbLJQl1KCashfffM2w5z-6CWB-13A\">\n    <js-placeholder 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Vagrant</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=\"/node/489\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Test Yaffs under Linux using Virtualbox and Vagrant\" 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<p>You can use this Vagrant box to test Yaffs.</p>\n<p>To run it you will need VirtualBox, which you can download from&nbsp;<a href=\"https://www.virtualbox.org/\">https://www.virtualbox.org/</a>&nbsp;(50 to 90MB download). To run Virtualbox you will need a PC which is capable of virtualisation. Any PC made in the since about 2006 should be capable of this, apart from notepads, and even some notepads have virtualisation.&nbsp;</p>\n<p>Follow the instructions to install VirtualBox on your system. It\'s available for Linux, Solaris, Windows and Mac.&nbsp;The Vagrant box was created using VirtualBox 4.1, but version 4.0 should be ok too if you have a problem with the 4.1 series.&nbsp;</p>\n<p>Once VirtualBox is installed you will need to download and install Vagrant. You find Vagrant at&nbsp;<a href=\"http://vagrantup.com/\">http://vagrantup.com/</a>. Download and install the latest version for your operating system from&nbsp;<a href=\"http://downloads.vagrantup.com/\">http://downloads.vagrantup.com/</a>. Vagrant is a download of between 10 and 60MB, depending on your operating system, excluding any Vagrant boxes you choose to download.&nbsp;The install instructions can be found at&nbsp;<a href=\"http://vagrantup.com/v1/docs/getting-started/index.html\">http://vagrantup.com/v1/docs/getting-started/index.html</a></p>\n<p>Now, download the <a href=\"https://docs.google.com/open?id=0ByOfch_s-hgmVmlENG80bHpwMlk\">Yaffs Vagrant box</a>, saving it to your hard drive. This is a large download - 3GB, so if you are on a slow network, you may wish to schedule it for a convenient time.</p>\n<p>After you have Vagrant installed, to test the Yaffs box, open a command line/terminal and type:</p>\n<pre style=\"padding-top: 8.5px; padding-right: 8.5px; padding-bottom: 8.5px; padding-left: 8.5px; font-family: Menlo, Monaco, \'Courier New\', monospace; font-size: 14px; color: rgb(51, 51, 51); border-top-left-radius: 4px; border-top-right-radius: 4px; border-bottom-right-radius: 4px; border-bottom-left-radius: 4px; margin-top: 0px; margin-bottom: 9px; line-height: 1.6em; background-color: rgb(254, 251, 243); border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-left-style: solid; border-top-color: rgba(0, 0, 0, 0.199219); border-right-color: rgba(0, 0, 0, 0.199219); border-bottom-color: rgba(0, 0, 0, 0.199219); border-left-color: rgba(0, 0, 0, 0.199219); border-image: initial; white-space: pre-wrap; word-break: break-all; word-wrap: break-word; -webkit-box-shadow: rgba(0, 0, 0, 0.0976563) 0px 1px 2px; box-shadow: rgba(0, 0, 0, 0.0976563) 0px 1px 2px;\"><span style=\"line-height: 1.6em;\">$ mkdir ~/yaffsprecise\n$ cd ~/yaffsprecise\n$ </span>vagrant box add yaffsprecise /wherever/you/saved/package.box\n$ vagrant init yaffsprecise\n$ vagrant up\n$ vagrant ssh</pre>\n<p>This will leave you at the command line of the Yaffs box.&nbsp;</p>\n<p>You can find the kernel and yaffs in the ~/kernel directory (i.e. /home/vagrant/kernel).</p>\n<p>You can create a Yaffs Nand Simulated drive using the following:</p>\n<pre style=\"padding-top: 8.5px; padding-right: 8.5px; padding-bottom: 8.5px; padding-left: 8.5px; font-family: Menlo, Monaco, \'Courier New\', monospace; font-size: 14px; color: rgb(51, 51, 51); border-top-left-radius: 4px; border-top-right-radius: 4px; border-bottom-right-radius: 4px; border-bottom-left-radius: 4px; margin-top: 0px; margin-bottom: 9px; line-height: 1.6em; background-color: rgb(254, 251, 243); border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-left-style: solid; border-top-color: rgba(0, 0, 0, 0.199219); border-right-color: rgba(0, 0, 0, 0.199219); border-bottom-color: rgba(0, 0, 0, 0.199219); border-left-color: rgba(0, 0, 0, 0.199219); border-image: initial; white-space: pre-wrap; word-break: break-all; word-wrap: break-word; -webkit-box-shadow: rgba(0, 0, 0, 0.0976563) 0px 1px 2px; box-shadow: rgba(0, 0, 0, 0.0976563) 0px 1px 2px;\"><span style=\"line-height: 1.6em;\">$ sudo </span><span style=\"color: rgb(34, 34, 34); line-height: 20px; text-align: justify;\">sudo modprobe nandsim first_id_byte=0xec second_id_byte=0xd3 third_id_byte=0x51 </span><span style=\"color: rgb(34, 34, 34); line-height: 20px; text-align: justify;\">fourth_id_byte=0x15\n</span><span style=\"color: rgb(34, 34, 34); line-height: 20px; text-align: justify;\">$ sudo mount -t yaffs /dev/mtdblock0 /media/nand</span></pre>\n<div>\nIn the commands above, there\'s no need to modprobe mtd or mtdblock because the Vagrant image has these compiled into the kernel.&nbsp;\n</div>\n<div>\n&nbsp;\n</div>\n<div>\nOnce you have mounted your Yaffs partition, you can experiment with writing and deleting files, watching what happens.\n</div>\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; 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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 21:37:36 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9844:\"<!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=\"_DqhneqJr49XKrClZitk6JAygLqM4mfSeIgBinJYYD5ZQA2rJyOipqFNw72s_ehUF6PvDjTDRQ\">\n    <title>Cross-platform and portable... | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"_DqhneqJr49XKrClZitk6JAygLqM4mfSeIgBinJYYD5ZQA2rJyOipqFNw72s_ehUF6PvDjTDRQ\">\n    <js-placeholder 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 <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        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Cross-platform and portable...\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>Cross-platform and portable...</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/cross-platform-and-portable\" 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-truck</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Yaffs is easy to port. It is written in C, with particular attention paid to making it portable. It\'s CPU independent, high/low bit independent (endian neutral) and doesn\'t rely on any particular operating system.  Look at the schematic in the <a href=\"/yaffs-overview\">Yaffs Overview</a> to see the relationship of the different elements.</p>\n\n<p>It\'s already been used under Linux, eCos, VxWorks, Win CE and more. </p>\n\n<p>Yaffs has been used successfully with many different 32-bit and 64-bit CPUs including MIPS, 68000, many from ARM, ColdFire, PowerPC and x86 variants. Yaffs works with 16-bit CPUs too, but this is less tested and might need some tuning, depending on compiler options. </p>\n\n<p>We\'ve found it easy to move to different processor architectures because it was designed to do this; as long as your processor is greater than 8-bit, Yaffs should run without needing much work.</p>\n\n<p>Read  <a href=\"http://www.yaffs.net/yaffs-porting-guide\">http://www.yaffs.net/yaffs-porting-guide</a> for more detail.</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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