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</ol>\n\n\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 Tuning</span>\n</h1>\n\n  <article role=\"article\" about=\"/documents/yaffs-tuning\" 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>22 July, 2012 - 8:23pm</span>\n        \n      </div>\n    </footer>\n  \n  <div class=\"content\">\n    \n      <div class=\"field field--name-upload field--type-file field--label-hidden field--items\">\n              <div class=\"field--item\"><span class=\"file file--mime-application-pdf file--application-pdf icon-before\"><span class=\"file-icon\"><span class=\"icon glyphicon glyphicon-file text-primary\" aria-hidden=\"true\"></span></span><span class=\"file-link\"><a href=\"https://yaffs.net/sites/default/files/downloads/YaffsTuning.pdf\" type=\"application/pdf; length=93667\" title=\"Open file in new window\" target=\"_blank\" data-toggle=\"tooltip\" data-placement=\"bottom\">YaffsTuning.pdf</a></span><span class=\"file-size\">91.47 KB</span></span></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<h2>1 Yaffs Direct Configuration</h2>\n\n<p>Yaffs behaviour is dictated by compile time and run-time flags.</p>\n\n<h3>1.1 Initialisation Parameters</h3>\n\n<p>Each yaffs device is configured by a yaffs_DeviceParameterStruct structure which is part of the yaffs_DeviceStruct structure. This contains the following fields:</p>\n\n<table><colgroup><col /><col /></colgroup><tr><td>\n			<p>name</p>\n			</td>\n			<td>\n			<p>An optional name for the device</p>\n			</td>\n		</tr><tr><td>\n			<p>totalBytesPerChunk</p>\n			</td>\n			<td>\n			<p>The number of bytes in the data area of the flash page. If inbandTags is not set then this whole area will be used to store data and the tags will be stored in the spare area. If inbandTags is set then part of this area will be used to store tags and the rest will be used to store data.</p>\n			</td>\n		</tr><tr><td>\n			<p>spareBytesPerChunk</p>\n			</td>\n			<td>\n			<p>The number of available bytes in the spare area of the flash page. This excludes space used by ECC, bad block markers etc.</p>\n			</td>\n		</tr><tr><td>\n			<p>startBlock</p>\n			</td>\n			<td>\n			<p>The first block in the partition to be used. 0 for first block.</p>\n			</td>\n		</tr><tr><td>\n			<p>endBlock</p>\n			</td>\n			<td>\n			<p>The last block in the partition to be used.</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>nReservedBlocks</p>\n			</td>\n			<td>\n			<p>Number of good blocks blocks reserved for garbage collection etc. Needs to be at least 2, but 5 would be a more typical number.</p>\n			</td>\n		</tr><tr><td>\n			<p>inbandTags</p>\n			</td>\n			<td>\n			<p>Yaffs2 only:Flag indicating whether tags should be stored in the data area. If inbandTags is set then the short Op cache must be enabled (ie nShortOpCaches must be non-zero.</p>\n			</td>\n		</tr><tr><td>\n			<p>useNANDECC</p>\n			</td>\n			<td>\n			<p>Yaffs1 only: Flag indicating whether the driver performs ECC. If this is zero then Yaffs will perform ECC.</p>\n			</td>\n		</tr><tr><td>\n			<p>noTagsECC</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: Flag indicating whether the tags have ECC attached to them.</p>\n			</td>\n		</tr><tr><td>\n			<p>isYaffs2</p>\n			</td>\n			<td>\n			<p>Flag indicating if this is using the Yaffs2 mechanism. If this is not set then Yaffs1 mode of operation is provided.</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>nShortOpCaches</p>\n			</td>\n			<td>\n			<p>Number of chunks to store in the short operation cache. Zero disables caching. Typical value is 10 to 20 or so. Caching is required for inband tags.</p>\n			</td>\n		</tr><tr><td>\n			<p>emptyLostAndFound</p>\n			</td>\n			<td>\n			<p>Flag to delete all files in lost and found on mount.</p>\n			</td>\n		</tr><tr><td>\n			<p>skipCheckpointRead</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: Flag to skip reading checkpoint on mount. If set then a re-scan is forced.</p>\n			</td>\n		</tr><tr><td>\n			<p>skipCheckpointWrite</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: Flag to skip writing checkpoint on sync or unmount.</p>\n			</td>\n		</tr><tr><td>\n			<p>refreshPeriod</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: How often Yaffs should do a block refresh. Values less than 10 disable block refreshing. Typical values would be1000.</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>initialiseNAND</p>\n			</td>\n			<td>\n			<p>Pointer to function to initialise flash driver.</p>\n			</td>\n		</tr><tr><td>\n			<p>deinitialiseNAND</p>\n			</td>\n			<td>\n			<p>Pointer to function to de-initialise flash driver</p>\n			</td>\n		</tr><tr><td>\n			<p>eraseBlockInNAND</p>\n			</td>\n			<td>\n			<p>Pointer to function to erase a flash block</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>writeChunkToNAND</p>\n			</td>\n			<td>\n			<p>Yaffs1 only: Pointer to function to write a chunk</p>\n			</td>\n		</tr><tr><td>\n			<p>readChunkFromNAND</p>\n			</td>\n			<td>\n			<p>Yaffs1 only: Pointer to function to read a chunk.</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>writeChunkWithTagsToNAND</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: Pointer to function to write a chunk plus tags</p>\n			</td>\n		</tr><tr><td>\n			<p>readChunkWithTagsFromNAND</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: Pointer to function to read a chunk plus tags</p>\n			</td>\n		</tr><tr><td>\n			<p>markNANDBlockBad</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: Function to mark a block bad</p>\n			</td>\n		</tr><tr><td>\n			<p>queryNANDBlock</p>\n			</td>\n			<td>\n			<p>Yaffs2 only: Function to query a block state</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>gcControl</p>\n			</td>\n			<td>\n			<p>Callback function that returns the garbage collector control flags. This is optional.</p>\n			</td>\n		</tr><tr><td>\n			<p>removeObjectCallback</p>\n			</td>\n			<td>\n			<p>Callback function called when an object is removed. This is set by the wrapper.</p>\n			</td>\n		</tr><tr><td>\n			<p>markSuperBlockDirty</p>\n			</td>\n			<td>\n			<p>Callback function that is called when a clean file system is first modified. This is set by the wrapper.</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>disableSoftDelete</p>\n			</td>\n			<td>\n			<p>Yaffs1 only. Debug only. Disables soft deletion if non-zero.</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>useHeaderFileSize</p>\n			</td>\n			<td>\n			<p>Debug only. Leave as zero</p>\n			</td>\n		</tr><tr><td>\n			<p>disableLazyLoading</p>\n			</td>\n			<td>\n			<p>Debug only. Leave as zero.</p>\n			</td>\n		</tr><tr><td>\n			<p>wideTnodeDisabled</p>\n			</td>\n			<td>\n			<p>Debug only. Leave as zero.</p>\n			</td>\n		</tr><tr><td>\n			<p> </p>\n			</td>\n			<td>\n			<p> </p>\n			</td>\n		</tr><tr><td>\n			<p>deferDirectoryUpdate</p>\n			</td>\n			<td>\n			<p>Used to defer directory updates.</p>\n			</td>\n		</tr></table><p> </p>\n\n<h3>1.2 Compile-time settings</h3>\n\n<p>These setting are used to apply compile-time configurations.</p>\n\n<p>CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED</p>\n\n<p>Normally Yaffs checks that chunks are erased only on the first chunk write to each block. This flag allows you to force all chunks to be checked. This is slower, but is worth using when doing early debugging.</p>\n\n<p>CONFIG_YAFFS_CASE_INSENSITIVE</p>\n\n<p>When selected case insensitive name comparisons are used. Note that this will not magically change Yaffs to be case insensitive in a case sensitive OS. This needs to be set according to the OS policy. Typically this is only used in Windows CE.</p>\n\n<p>CONFIG_YAFFS_DIRECT</p>\n\n<p>Used when compiling Yaffs Direct.</p>\n\n<p>CONFIG_YAFFS_DISABLE_LAZY_LOAD</p>\n\n<p>Lazy loading is used to defer loading up object details until the objects are accessed. This makes mount time faster. This flag can disable lazy loading. Debug only.</p>\n\n<p>CONFIG_YAFFS_ECC_WRONG_ORDER</p>\n\n<p>This flag should only be used with old Linux MTD code which had a bug in the ECC byte ordering.</p>\n\n<p>CONFIG_YAFFS_NO_YAFFS1</p>\n\n<p>Used to say that only Yaffs2 operation should be compiled in. Not currently supported.</p>\n\n<p>CONFIG_YAFFS_SHORT_NAMES_IN_RAM</p>\n\n<p>Set to configure Yaffs to store short object names in RAM. This is faster, but uses up more memory.</p>\n\n<p>CONFIG_YAFFS_UNICODE</p>\n\n<p>Set to configure Yaffs to use Unicode file names (eg. With WinCE).</p>\n\n<p>CONFIG_YAFFS_USE_OWN_SORT</p>\n\n<p>By default, Yaffs uses qsort for sorting blocks at mount scanning time. This is faster. Using this flag forces Yaffs to use a slow internal sort instead. Debug only.</p>\n\n<p>CONFIG_YAFFS_UTIL</p>\n\n<p>Used when compiling Yaffs for utilities.</p>\n\n<p>CONFIG_YAFFS_WINCE</p>\n\n<p>Set when compiling Yaffs for WinCE.</p>\n\n<p>CONFIG_YAFFS_YAFFS2</p>\n\n<p>Set when using Yaffs2 mode. At present this must always be set.</p>\n\n<p>CONFIG_YAFFSFS_PROVIDE_VALUES</p>\n\n<p>Used when compiling Yaffs Direct only.</p>\n\n<h3>2 Tracing mechanism</h3>\n\n<p>Yaffs has a lot of built in tracing to help debug and integrate. The tracing is controlled by yaffs_traceMask bitmask which allows various sets of tracing to be disabled or enabled at runtime.</p>\n\n<p>The trace bits are specified in the yaffs_trace.h file.</p>\n\n<p>The tracing mechanism has also been \'hijacked\' to provide a control mask for extra verification code when the YAFFS_TRACE_VERIFYxxx trace bits are selected.</p>\n\n<p>The tracing mechanism is readily integrated into the system via printf-like statements. Tracing is all done through macros which allow the strings to be converted into unicode or similar if need be.</p>\n\n<h2>3 Linux</h2>\n\n<h3>3.1 Linux compile-time flags</h3>\n\n<p>The Linux compile time flags are documented in the Kconfig file and will not be duplicated here.</p>\n\n<h3>3.2 Linux: /proc/yaffs trace adjustment</h3>\n\n<p>Under Linux, the tracing mechanism is hooked up to both the /proc/yaffs and the sys interface. The /proc/yaffs interface is very user friendly.</p>\n\n<p><code>#cat +os &gt; /proc/yaffs # Enables YAFFS_TRACE_OS<br />\n#cat -all+gc &gt; /proc/yaffs # Disables everything then enable YAFFS_TRACE_GC<br />\n#cat 0xf000 &gt; /proc/yaffs # Set trace mask to specified bitmask.</code></p>\n\n<h3>3.3 Linux: /sys/ interface</h3>\n\n<p>The Linux /sys/ interface is used by many Linux OS components to access the state of control variables. Some Yaffs variables are available via /sys/module/yaffs2/parameters/ *. Values can be read and modified using standard shell commands or from application programs.</p>\n\n<p><code># ls /sys/module/yaffs2/parameters/ yaffs_auto_checkpoint yaffs_traceMask yaffs_wr_attempts<br />\n# cat /sys/module/yaffs2/parameters/yaffs_auto_checkpoint 1<br />\n# echo \"2\" &gt; /sys/module/yaffs2/parameters/yaffs_auto_checkpoint<br />\n# cat /sys/module/yaffs2/parameters/yaffs_auto_checkpoint 2 </code></p>\n\n<p>Yaffs currently supports the following variables:</p>\n\n<p>yaffs_auto_checkpoint: Controls when checkpoints should be written.</p>\n\n<p>yaffs_traceMask: An alternative, and less user friendly,interface to modify tracing.</p>\n\n<p>yaffs_wr_attempts: The number of attempts that Yaffs will make to write a chunk.</p>\n\n<p>yaffs_gc_control: Controls the garbage collector.</p>\n\n<h3>3.4 Linux: /proc/yaffs state dumping</h3>\n\n<p>Some of the state of Yaffs mounts can be determined by reading the /proc/yaffs entry.</p>\n\n<p><code># cat /proc/yaffs<br />\ncharles@charles-laptop:/opt/y/cvs/yaffs2$ cat /proc/yaffs<br />\nYAFFS built:Mar 16 2010 11:52:25<br />\n$Id: yaffs_fs.c,v 1.101 2010-03-15 22:27:15 charles Exp $<br />\n$Id: yaffs_guts.c,v 1.119 2010-03-12 02:48:34 charles Exp $<br /><br />\nDevice 0 \"NAND simulator partition 0\" </code><br /><code>startBlock......... 0<br />\nendBlock........... 511<br />\ntotalBytesPerChunk. 2048<br />\nuseNANDECC......... 1<br />\nnoTagsECC.......... 0<br />\nisYaffs2........... 1<br />\ninbandTags......... 0<br />\nemptyLostAndFound.. 1<br />\ndisableLazyLoad.... 0<br />\nrefreshPeriod...... 10000<br />\nnShortOpCaches..... 10<br />\nnReservedBlocks.... 5<br /><br />\nnDataBytesPerChunk. 2048<br />\nchunkGroupBits..... 0<br />\nchunkGroupSize..... 1<br />\nnErasedBlocks...... 152<br />\nblocksInCheckpoint. 0<br /><br />\nnTnodesCreated..... 2300<br />\nnFreeTnodes........ 1852<br />\nnObjectsCreated.... 2300<br />\nnFreeObjects....... 1842<br />\nnFreeChunks........ 27843<br /><br />\nnPageWrites........ 65993<br />\nnPageReads......... 19631<br />\nnBlockErasures..... 1133<br />\nnGCCopies.......... 37<br />\ngarbageCollections. 161<br />\npassiveGCs......... 137<br />\nnRetriedWrites..... 0<br />\nnRetireBlocks...... 0<br />\neccFixed........... 0<br />\neccUnfixed......... 0<br />\ntagsEccFixed....... 0<br />\ntagsEccUnfixed..... 0<br />\ncacheHits.......... 44110<br />\nnDeletedFiles...... 0<br />\nnUnlinkedFiles..... 42917<br />\nrefreshCount....... 1<br />\nnBackgroudDeletions 0</code></p>\n\n<p> </p>\n\n<h2>4 Conclusions</h2>\n\n<p>Yaffs includes many options for changing speed or memory use, with specific flags for the Yaffs Direct Interface as well as Linux. Under Linux many of the control variables can be altered using standard Linux systems.</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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   </ol>\n\n\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  <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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class=\"visually-hidden\">Primary tabs</h2>\n  <ul class=\"tabs--primary nav nav-tabs\"><li class=\"active\"><a href=\"/documents\" data-drupal-link-system-path=\"documents\" class=\"is-active\">Main<span class=\"visually-hidden\">(active tab)</span></a></li>\n<li><a href=\"/documents/detail\" data-drupal-link-system-path=\"documents/detail\">Detail</a></li>\n<li><a href=\"/documents/technical\" data-drupal-link-system-path=\"documents/technical\">Technical</a></li>\n<li><a href=\"/documents/archive\" data-drupal-link-system-path=\"documents/archive\">Archive</a></li>\n<li><a href=\"/documents/video\" data-drupal-link-system-path=\"documents/video\">Video</a></li>\n</ul>\n\n    </nav>\n    <div class=\"views-element-container form-group\"><div class=\"view view-yaffs-documents view-id-yaffs_documents view-display-id-page_1 js-view-dom-id-3932584f072873fb0f0d8bc68d717bf79f35a9fb078a7dd7a968089cce013d38\">\n  \n    \n      \n      <div class=\"view-content\">\n        <div class=\"table-responsive\">\n<table class=\"table table-hover\">\n        <thead>\n    <tr>\n                                      <th class=\"views-field views-field-title\" scope=\"col\"></th>\n                                      <th id=\"view-draggableviews-table-column\" class=\"views-field views-field-draggableviews\" scope=\"col\">Content</th>\n                                      <th class=\"priority-low views-field views-field-upload\" id=\"view-upload-table-column\" scope=\"col\">PDF/Attachment</th>\n          </tr>\n    </thead>\n    <tbody>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/yaffs-licence-sample\" hreflang=\"und\">Yaffs Licence Sample</a>While the Yaffs code is available free of charge under GNU General Public Licence, version 2, that entails the obligation to disclose Source Code for your application using Yaffs. An Aleph One Licence does not impose that obligation and so is attractive for proprietary projects. This sample Licence provides an example of the points we expect a Licence to cover.        </td>\n                                                                      <td headers=\"view-draggableviews-table-column\" class=\"views-field views-field-draggableviews\">        </td>\n                                                                      <td class=\"priority-low views-field views-field-upload\" headers=\"view-upload-table-column\">        </td>\n          </tr>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/yaffs-overview\" hreflang=\"und\">Yaffs Overview</a>YAFFS is a filesystem designed specifically for the characteristics of NAND flash. This page gives an overview of the project - what is available, how it works, how to use it, developer resources, and licensing options.        </td>\n                                                                      <td headers=\"view-draggableviews-table-column\" class=\"views-field views-field-draggableviews\">        </td>\n                                                                      <td class=\"priority-low views-field views-field-upload\" headers=\"view-upload-table-column\">        </td>\n          </tr>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/yaffs-licence-faqs\" hreflang=\"und\">Yaffs Licence FAQs</a><p>Some questions about the commercial licence for Yaffs and how we arrive at one.</p>        </td>\n                                                                      <td headers=\"view-draggableviews-table-column\" class=\"views-field views-field-draggableviews\">        </td>\n                                                                      <td class=\"priority-low views-field views-field-upload\" headers=\"view-upload-table-column\">        </td>\n          </tr>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/documents/faq\" hreflang=\"und\">FAQ</a><p>Common questions about Yaffs technical issues.</p>        </td>\n                                                                      <td headers=\"view-draggableviews-table-column\" class=\"views-field views-field-draggableviews\">        </td>\n                                                                      <td class=\"priority-low views-field views-field-upload\" headers=\"view-upload-table-column\">        </td>\n          </tr>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/licences-more-background-and-detail\" hreflang=\"und\">Licences - more background and detail</a><p>More on the details and background of Licences for Yaffs</p>        </td>\n                                                                      <td headers=\"view-draggableviews-table-column\" class=\"views-field views-field-draggableviews\">        </td>\n                                                                      <td class=\"priority-low views-field views-field-upload\" headers=\"view-upload-table-column\">        </td>\n          </tr>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/documents/considerations-choosing-flash-file-system\" hreflang=\"und\">Considerations in Choosing a Flash File System</a>Failures in an embedded File System in a product are much more serious to the user than failures in an office computer.&nbsp; Power failures and failures to cache data properly can be avoided by choosing a FFS specifically designed for reliability from the ground up.        </td>\n                                                                      <td headers=\"view-draggableviews-table-column\" class=\"views-field views-field-draggableviews\">        </td>\n                                                                      <td class=\"priority-low views-field views-field-upload\" headers=\"view-upload-table-column\"><span class=\"file file--mime-application-pdf file--application-pdf icon-before\"><span class=\"file-icon\"><span class=\"icon glyphicon glyphicon-file text-primary\" aria-hidden=\"true\"></span></span><span class=\"file-link\"><a href=\"https://yaffs.net/sites/default/files/downloads/ConsiderationsInChoosingAFlashFileSystem_0.pdf\" type=\"application/pdf; length=131376\" title=\"Open file in new window\" target=\"_blank\" data-toggle=\"tooltip\" data-placement=\"bottom\">ConsiderationsInChoosingAFlashFileSystem.pdf</a></span><span class=\"file-size\">128.3 KB</span></span>        </td>\n          </tr>\n    </tbody>\n</table>\n  </div>\n\n    </div>\n  \n          </div>\n</div>\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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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        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  An active community...\n              </li>\n      </ol>\n\n\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>An active community...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/active-community\" 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-users</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>You can learn from the experience of people and companies who are working with Yaffs. Thousands of developers have used Yaffs successfully, and commercially-licensed Yaffs has many customers that use it repeatedly. Have a look at the mailing list - it\'s a great place to start if you have some questions.<br /><a href=\"http://stoneboat.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs\">http://stoneboat.aleph1.co.uk/cgi-bin/mailman/listinfo/yaffs</a></p>\n\n<p>The searchable archive of postings is at <a href=\"http://lists.aleph1.co.uk/lurker/list/yaffs.html\">http://lists.aleph1.co.uk/lurker/list/yaffs.html   </a>Or search online to see the variety of work done with Yaffs as its basis - from research papers through to skunkworks projects for testing particular concepts.</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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name=\"description\" content=\"It is important for a Flash filesystem to boot fast, so boot speed was a fundamental consideration in the design of Yaffs.\" />\n<meta name=\"abstract\" content=\"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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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        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Booting is fast...\n              </li>\n      </ol>\n\n\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>Booting is fast...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/booting-fast\" 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-space-shuttle</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Being quick to boot was one of the fundamental requirements in Yaffs\' design. Boot-time scanning to build the file structure lists should require just one pass reading NAND memory.</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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try before you buy... | Yaffs - A Flash File System for embedded use</title>\n    <link rel=\"stylesheet\" href=\"/sites/default/files/css/css_YGKHk3qOgVcGqV_6s_kZUGJkGYQEouHb462Ja18qfRA.css?ozekku\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"/sites/default/files/css/css_6qeLA6GBkZNPHWp9GdQIYovV3tYuKU-ts-HicZ-WeQQ.css?ozekku\" media=\"all\" />\n\n    \n<!--[if lte IE 8]>\n<script src=\"/sites/default/files/js/js_VtafjXmRvoUgAzqzYTA3Wrjkx9wcWhjP0G4ZnnqRamA.js\"></script>\n<![endif]-->\n\n  </head>\n  <body class=\"fontyourface path-node page-node-type-what-is-special-about-yaffs 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        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  For closed source projects - try before you buy...\n              </li>\n      </ol>\n\n\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>For closed source projects - try before you buy...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/closed-source-projects-try-you-buy\" 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-credit-card</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>When shopping for a software component, it\'s always useful to be able to try it out before buying.</p>\n\n<p>For your proprietary projects, the GPL version of Yaffs lets you do just that - download it, examine the code and test it out. 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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        <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\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  <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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It is available under GNU Public License, GPL, or on commercial terms from Aleph One.\" />\n<meta name=\"keywords\" content=\"flash File System, flash, file System, flash storage, NAND flash, NOR flash, Yaffs\" />\n<meta name=\"Generator\" content=\"Drupal 8 (https://www.drupal.org)\" />\n<meta name=\"MobileOptimized\" content=\"width\" />\n<meta name=\"HandheldFriendly\" content=\"true\" />\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSansRegular-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSansItalic-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSansBold-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" 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class=\"active\">\n                  Data is safe with Yaffs...\n              </li>\n      </ol>\n\n\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>Data is safe with Yaffs...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/data-safe-yaffs\" 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-lock</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Yaffs provides bad block handling and ECC algorithms to handle deficiencies in NAND flash.</p>\n\n<p>It is a log-structured file system which makes it very robust to corruptions caused by power failures.</p>\n\n<p>We spend about 60% of development time on testing Yaffs, and our test harness is available for download so you can check the testing and perform some yourself.</p>\n\n<p>We\'ve performed hundreds of thousands of tests to make sure that Yaffs is as safe as we can make it, even in the even of a power failure during a firmware update.</p>\n\n<p>You can find full details of the Yaffs testing regime in our paper <a href=\"http://www.yaffs.net/documents/yaffs-robustness-and-testing\">http://www.yaffs.net/documents/yaffs-robustness-and-testing</a>  including all the details on the power-fail stress tests, the Yaffs Direct API tests for commercial RTOSs, Linux testing, and fuzz testing where we deliberately corrupt Yaffs file systems to check that Yaffs can still mount.</p></div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n           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class=\"active\">\n                  A file system designed for Flash memory...\n              </li>\n      </ol>\n\n\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 file system designed for Flash memory...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/file-system-designed-flash-memory\" 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-microchip</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Yaffs was designed from the ground up for Flash memory. It is best with NAND Flash but can be used with NOR too. It has mechanisms for wear-levelling, and special attention has been paid to the safety of the system even under power-failure. It is works well with MLC Nand, as well as SLC; it is compatible with a wide range of Flash, including Toshiba/Sandisk MLC parts.  See also the document   Considerations in Using a Flash File System  for a discussion of the importance of reliability.</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=\"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                  High and low level interfaces...\n              </li>\n      </ol>\n\n\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>High and low level interfaces...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/high-and-low-level-interfaces\" 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-stethoscope</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>We provide a high level interface with the GPL version of Yaffs, so it\'s easy to use with Linux and other OS\'s that support POSIX.  This support includes directories, symbolic and hard links, through standard file system interface calls.</p>\n\n<p>But when you want to integrate Yaffs directly into your OS or your code, you\'ll most likely want to make use of the Yaffs Direct Interface or other low-level interfaces:</p>\n\n<ul><li>Application Interface: This is the interface that the application code uses to access the YAFFS file system.</li>\n	<li>RTOS Integration Interface: These are the functions that much be provided for YAFFS to access the RTOS system resources.</li>\n	<li>NAND Configuration and Access Interface: These are the functions that must be provided for YAFFS to access the NAND flash.</li>\n</ul><p>Have a look at the guides in the Documents section, to find out more about <a href=\"/documents\">integrating Yaffs</a>.</p></div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              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matches your Flash memory | Yaffs - A Flash File System for embedded use</title>\n    <link rel=\"stylesheet\" href=\"/sites/default/files/css/css_YGKHk3qOgVcGqV_6s_kZUGJkGYQEouHb462Ja18qfRA.css?ozekku\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"/sites/default/files/css/css_6qeLA6GBkZNPHWp9GdQIYovV3tYuKU-ts-HicZ-WeQQ.css?ozekku\" media=\"all\" />\n\n    \n<!--[if lte IE 8]>\n<script src=\"/sites/default/files/js/js_VtafjXmRvoUgAzqzYTA3Wrjkx9wcWhjP0G4ZnnqRamA.js\"></script>\n<![endif]-->\n\n  </head>\n  <body class=\"fontyourface path-node page-node-type-what-is-special-about-yaffs 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        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Highly configurable - matches your Flash memory\n              </li>\n      </ol>\n\n\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>Highly configurable - matches your Flash memory</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/highly-configurable-matches-your-flash-memory\" 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-check-square</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p>Yaffs is adaptable to suit the Flash geometries, caching options, Error Correction strategies and other features that you need.</p>\n<p>Details of the configuration options can be found in the Linux menuconfig compile options tool, and in&nbsp; <a href=\"http://www.yaffs.net/yaffs-tuning-and-configuration\">http://www.yaffs.net/yaffs-tuning-and-configuration</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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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. 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class=\"active\">\n                  Predictable and performance oriented\n              </li>\n      </ol>\n\n\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  <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. 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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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