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It is widely used with Linux, RTOSs, or no OS at all, in consumer devices and critical infrastructure. It is available under GNU Public License, GPL, or on commercial terms from Aleph One.\" />\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. It is widely used with Linux, RTOSs, or no OS at all, in consumer devices and critical infrastructure. 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Archive\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\">Documents - Archive</h1>\n\n      <nav class=\"tabs\" role=\"navigation\" aria-label=\"Tabs\">\n        <h2 class=\"visually-hidden\">Primary tabs</h2>\n  <ul class=\"tabs--primary nav nav-tabs\"><li><a href=\"/documents\" data-drupal-link-system-path=\"documents\">Main</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 class=\"active\"><a href=\"/documents/archive\" data-drupal-link-system-path=\"documents/archive\" class=\"is-active\">Archive<span class=\"visually-hidden\">(active tab)</span></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_4 js-view-dom-id-a971dc3991ce0f6d4952f672ace85150446f2df15cdce60c34e4c1afda214f44\">\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=\"/archives/yaffs-original-specification\" hreflang=\"und\">Yaffs Original Specification</a>The initial specification for Yaffs. Circa 2002. Details of the filing system, including short backgrounder. Read this if you want to know what it is, what it does and how it works. This specification does not cover Yaffs2.        </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=\"/archives/yaffs-development-notes\" hreflang=\"und\">Yaffs (Yaffs1) Development Notes</a>\n<p>Notes on how to use Yaffs (Yaffs1) and some details of the internal structures - useful if you want to mess with the code. This document is included in the Yaffs1 download.</p>\n        </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=\"/archives/howto-incorporate-yaffs-linux\" hreflang=\"und\">HOWTO incorporate YAFFS in Linux</a>Simple HOWTO for getting started with YAFFS and using it as a root filesystem. If you just want the <i>quick start</i> info - read this.        </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=\"/archive/jffs2-and-nand-study\" hreflang=\"und\">JFFS2 and NAND study</a>Discussion of the characteristics of NAND and NOR flash and how those interact with JFFS2 to produce significant boot-time delays and high RAM consumption, especially with large flash chips.        </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=\"/archives/state-nand-mtd-driver-start-project\" hreflang=\"und\">State of NAND MTD driver at start of project</a>\n<p>Details of Dec 2001 state of nand driver, and overview of how drivers fit together for use with different hardware and filesystems. Not really intended for public consumption, but a useful backgrounder and explanation of the evolution of YAFFS.</p>\n        </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=\"/archives/yaffs-history\" hreflang=\"und\">Yaffs History</a>\n<p>A chronology and list of milestones in Yaffs development.</p>\n        </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=\"/archives/fuel-embedded-database-use-yaffs\" hreflang=\"und\">FUEL Embedded Database for use with YAFFS</a>\n<p>YAFFS and the new FUEL Database from ITTIA work together. ITTIA has released the first beta of an all-new database for mobile and embedded systems.&nbsp;</p>\n        </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=\"/archives/paper-investigating-log-management-crash-recovery-mechanism\" hreflang=\"und\">Paper investigating a log management &amp; crash recovery mechanism</a><p>This provides a link to a PDF of a paper by Taiwanese scholars.</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=\"/archives/yaffs-talk-pdf-slides-celf-2007\" hreflang=\"und\">Yaffs Talk - PDF of slides from CELF, 2007</a><p>Attached is a PDF with slides from the Yaffs talk at CELF\'s Embedded Linux Conference Europe 2007. If you are able to view Ogg Theora video files, the talk is also <a href=\"http://free-electrons.com/pub/video/2007/elce/elce-2007-wookey-yaffs.ogg\">online</a>. Ogg Theora is a Free video format. Free players are available for all platforms. See the list <a href=\"http://wiki.xiph.org/index.php/TheoraSoftwarePlayers\">here</a>. If in doubt, VLC is probably available for your operating system.</p><p>If you prefer to go straight to the .pdf if clides  click <a href=\"http://www.yaffs.net/sites/yaffs.net/files/yaffs.pdf\">http://www.yaffs.net/sites/yaffs.net/files/yaffs.pdf</a></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\"><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/yaffs.pdf\" type=\"application/pdf; length=177635\" title=\"Open file in new window\" target=\"_blank\" data-toggle=\"tooltip\" data-placement=\"bottom\">yaffs.pdf</a></span><span class=\"file-size\">173.47 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; 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=\"active\">\n                  Considerations in Choosing a Flash File System\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>Considerations in Choosing a Flash File System</span>\n</h1>\n\n  <article role=\"article\" about=\"/documents/considerations-choosing-flash-file-system\" 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/laurie\" typeof=\"schema:Person\" property=\"schema:name\" datatype=\"\">Laurie</span></span>\n on <span>28 May, 2014 - 1:53pm</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/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></div>\n          </div>\n  \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p>We have been developing flash file system for embedded systems since 1995. During that time, we have gained a wealth of knowledge and experience.</p>\n<p>This document outlines some of the major issues that must be considered when selecting a Flash File system for embedded use. It also explains how using the Yaffs File System increases reliability, reduces risk and saves money.</p>\n<h1 class=\"western\" style=\"page-break-before: always\">Introduction</h1>\n<p>As embedded system complexity increases and flash storage prices decrease, we see more use of embedded file systems to store data, and so data corruption and loss has become an important cause of system failure.</p>\n<p>When Aleph One began the development of Yaffs in late 2001, we built on experience in flash file system design since 1995. This experience helped to identify the key factors in making Yaffs a fast and robust flash file system now being widely used around the world.</p>\n<p>Although it was originally developed for Linux, Yaffs was designed to be highly portable. This has allowed Yaffs to be ported to many different OSs (including Linux, BSD, Windows CE) and numerous RTOSs (including VxWorks, eCos and pSOS).</p>\n<p>Yaffs is written in fully portable C code and has been used on many different CPU architectures – both little- and big-endian. These include ARM, x86 and PowerPC, soft cores such as NIOS and Microblaze and even various DSP architectures.</p>\n<p>We believe that the Yaffs code base has been used on more OS types and more CPU types than any other file system code base.</p>\n<p>Since its introduction, Yaffs has been used in hundreds of different products and hundreds of millions of different devices in widely diverse application areas from mining to aerospace and everything in between.</p>\n<p>Specific examples include:</p>\n<ul>\n<li>\n<p>communications (two-way radios and infrastructure, mobile phones, cell towers, modems, routers...)</p>\n </li>\n<li>\n<p>retail (point of sale, inventory control...)</p>\n </li>\n<li>\n<p>entertaiment (video cameras, TV sets, DVD players, set-top boxes...)</p>\n </li>\n<li>\n<p>sewing machines and office copiers</p>\n </li>\n<li>\n<p>industrial equipment (PLCs, machinery control...)</p>\n </li>\n<li>\n<p>construction/surveying equipment (theodolites, machinery control...)</p>\n </li>\n<li>\n<p>avionics and satellite equipment</p>\n </li>\n<li>\n<p>transport (bus, train and traffic-signal management/information systems...)</p>\n </li>\n<li>\n<p>and many more.</p>\n </li>\n</ul>\n<p><br />\n<br />\n</p>\n<p><i><b>You may be using Yaffs every day without even realising it.</b></i></p>\n<p><i><b>We have a gratifying number of repeat customers for licences.</b></i></p>\n<h1 class=\"western\"><br />\n<br />\n</h1>\n<h1 class=\"western\" style=\"page-break-before: always\">Do Embedded Systems have different file system needs?</h1>\n<p>To answer this question, we really have to start by asking a slightly different question:</p>\n<p><i>How are embedded systems different than regular computers?</i></p>\n<p style=\"font-style: normal\">When a customer buys a regular computer system, they go shopping for a computer. They talk to the salesperson about Gigabytes, Megahertz and operating systems. They treat it as a computer and expect it to behave like a computer (including shutting it down properly and occasionally having file system problems or needing upgrades).</p>\n<p style=\"font-style: normal\">When they buy a fancy sewing machine, it probably has an embedded file system controlling it. The customer went shopping for a sewing machine and bought a computer that they don\'t even know about. They don\'t treat it like a computer, but like a sewing machine; they certainly do not expect it to have file system problems.</p>\n<h4 class=\"western\">How people treat computers differently from embedded systems</h4>\n<table cellpadding=\"4\" style=\"page-break-inside: avoid; width: 100%; border-spacing: 0px;\">\n<col width=\"85*\" /> <col width=\"85*\" /> <col width=\"85*\" />\n<tr valign=\"top\">\n <td style=\"border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0.1cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\"><b>Issue</b></span></p>\n  </td>\n <td style=\"border-top: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0.1cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\"><b>Computer</b></span></p>\n  </td>\n <td style=\"border: 1px solid #000000; padding: 0.1cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\"><b>Embedded system</b></span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Shut down</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">User expects to do a clean shut down.</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">User just unplugs device.</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Reinstalling software</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Users expect to have to deal with corruption and reinstall software occasionally.</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Users do not expect to deal with upgrades or data loss or corruption.</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%; height: 11px;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Software Upgrade Failure</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Annoying</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Can be devastating</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Attitude to data loss</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Annoying, but expected</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">System has failed.</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Cost of failure</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Relatively minor</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Can shut down factory or even cause injury/death.</span></p>\n  </td>\n</tr>\n<tr valign=\"top\">\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Delayed boot due to file system recovery</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: none; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Annoying, but expected.</span></p>\n  </td>\n <td style=\"border-top: none; border-bottom: 1px solid #000000; border-left: 1px solid #000000; border-right: 1px solid #000000; padding-top: 0cm; padding-bottom: 0.1cm; padding-left: 0.1cm; padding-right: 0.1cm; width: 33%;\">\n <p><span style=\"font-size: 11pt; font-size: small; font-size: small;\">This is as bad as a failure.</span></p>\n  </td>\n</tr>\n</table>\n<p style=\"font-style: normal\"><br />\n<br />\n</p>\n<p>So people have different attitudes to computers and embedded systems. As a result, embedded systems need to be designed differently from computers. That is particularly important with reliability issues.</p>\n<p style=\"margin-bottom: 0.01cm\"><i><b>Data corruption is a leading cause of embedded system failure, </b></i> </p>\n<p style=\"margin-bottom: 0.01cm\"><i><b>product returns and warranty costs.</b></i> </p>\n<p style=\"margin-bottom: 0.01cm\"><br />\n<br />\n</p>\n<p>The differences outlined above show some of the reasons why embedded systems must perform differently to regular computers, particularly in the way data storage is handled. These examples allow us to identify some very important product-level criteria for embedded file systems:</p>\n<ul>\n<li>\n<p>High resilience against data corruption, particularly in the event of power loss.</p>\n </li>\n<li>\n<p>Prompt file system recovery after power loss - no excessive time penalty</p>\n </li>\n<li>\n<p>Simple data integrity model to ensure data is not compromised.</p>\n </li>\n</ul>\n<p>Of course we also want the embedded file system to have some other very useful features:</p>\n<ul>\n<li>\n<p>High read/write performance with low latency.</p>\n </li>\n<li>\n<p>Familiar programming models to facilitate development.</p>\n </li>\n<li>\n<p>Proven track record to reduce risk.</p>\n </li>\n<li>\n<p>Full source code access to aid development.</p>\n </li>\n<li>\n<p>Portability to provide a future-proof solution for new products.</p>\n </li>\n</ul>\n<p><i><b>Selecting an appropriate file system is crucial to product success.</b></i></p>\n<h1 class=\"western\" style=\"page-break-before: always\">Why does power failure corrupt data?</h1>\n<p>Most power fail data loss in a File System is caused through two mechanisms:</p>\n<ul>\n<li>\n<p>Corruption of allocation tables </p>\n </li>\n<li>\n<p>Loss of cached data that was not yet written to the flash.</p>\n </li>\n</ul>\n<h2 class=\"western\">Corruption of allocation tables and similar structures.</h2>\n<p>Most file systems have allocation tables, bitmaps or similar structures which hold pointers showing which parts of the file storage medium are being used and which parts of which file are stored there. These tables are critical to looking up files and data in the file system. If they are corrupted, then files and data become corrupted. In the most dramatic cases, table corruption can destroy the whole system. </p>\n<p>Some file systems make these tables more robust by keeping two copies, or by using journaling (which keeps a short log of changes, allowing the tables to be fixed up if the table changing gets interrupted) but this causes extra writes to the media, making the file system slower.</p>\n<p>These tables are typically updated many times during writing any file, so there are multiple opportunities for the tables to be corrupted or left in an inconsistent state due to a power loss.</p>\n<p>If power is interrupted at a critical point, then some restoration (such as Microsoft chkdsk or booting in <span style=\"font-style: normal\">safe mode</span>) is often required to try to restore the tables. This may be automatic, but then system start-up is delayed.</p>\n<p>Yaffs is very different; it is a log structured file system which writes tagged data to the flash, and does not store allocation tables or such.</p>\n<p><i><b>If it isn\'t even stored, it can\'t be corrupted!</b></i></p>\n<p>This has three dramatic effects:</p>\n<ul>\n<li>\n<p>Yaffs has no tables, so is immune to these failure modes.</p>\n </li>\n<li>\n<p>There are no extra tables to be written, so Yaffs does not have to resort to caching to achieve good performance.</p>\n </li>\n<li>\n<p>Fewer flash writes means less flash wear, improving product life and reducing power consumption.</p>\n </li>\n</ul>\n<p>When a Yaffs file system is booted, the normal boot up sequence takes care of building up system state. There is thus no need for any special restoration code to be run. A boot up after a power failure is not a special recovery condition, it is just a normal boot up.</p>\n<p><i><b>Yaffs does not have, or need, special recovery handling.</b></i></p>\n<h2 class=\"western\" style=\"page-break-after: avoid\"><span style=\"font-family: Liberation Sans, sans-serif;\"><i><b>Trade-off in cached data</b></i></span></h2>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\">File systems tend to be inefficient in the way they write data. Writing just one file requires many changes to the allocation tables; writing many files requires far more changes, often to those same tables. By delaying those writes and holding data in RAM briefly the file system can do fewer writes to achieve the same set of changes. This can improve write speed, at a price.</span></span></p>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Data which has not been written but just cached in RAM is vulnerable while it is there; it can all be lost if power fails, even including some that the FS had apparently written already.</span></span></p>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Most file systems support functions to reduce this inefficiency and force the cache to be written out, but this may take many seconds, leaving a significant period of vulnerability, and delaying system operations. Excessive use of these functions to improve reliability will typically impair write performance.</span></span></p>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\">A particularly serious example of critical data loss can occur if power or communication fails during a firmware upgrade. Such a failure cripples the product, which must be returned for servicing. Yaffs has caching policies and data integrity models which make it easier to avoid this kind of fatal failure, and which have been tested very extensively. </span></span> </p>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\">Since Yaffs is inherently faster and simpler, it does not need deep caching. The Yaffs cache is small and used only for data alignment purposes and improving the throughput of very small reads and writes. Yaffs files are always flushed from the cache when they are closed. Yaffs also provides its own cache-flushing functions, but these are very fast because the cache is small.</span></span></p>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\"><i><b>By the time Yaffs closes a file, all the data is guaranteed to be safe on the flash.</b></i></span></span></p>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\">This simple caching policy makes it very easy for programmers to write software that is robust against power loss and avoids obscure failure modes. The simplicity confers more reliable operation, faster product development and huge savings in development and maintenance costs.</span></span></p>\n<p><span style=\"font-family: Liberation Sans, sans-serif;\"><span style=\"font-size: 11pt; font-size: small; font-size: small;\"><i><b>Reliable file systems pay for themselves many times over.</b></i></span></span></p>\n<h1 class=\"western\" style=\"page-break-before: always\">Product risk reduction</h1>\n<p>At first glance, a file system seems like it should be a simple body of code: just a few functions that read, write data and look things up by name. However, the reality is much more complex than that.</p>\n<p>One of the most challenging aspects of file systems is that errors are stored and incremental. Unlike most software errors which can be cleared by a reset, storage errors are persistent.</p>\n<p><i><b>A reboot will typically not fix file-system errors.</b></i></p>\n<p>Customers might tolerate a product that needs to be reset once in a while, but file system failures are often fatal. As a result, file system issues can be very damaging to long-term product reliability.</p>\n<p>This is further complicated by flash memory. NAND flash is the only type of semiconductor hardware which leaves the factory with known variable errors, expecting the file system software to handle the problems.</p>\n<p>Flash, NAND in particular, has its own failure modes and these are best handled by a file system specifically designed for NAND.</p>\n<p><i><b>Yaffs was specifically designed to use with NAND and NOR flash chips.</b></i></p>\n<p>Flash memory chip errors may only show up after the product has been used a while, or in a fraction of the flash parts. Typical testing during development (e.g. bench testing) will often fail to expose all types of flash chip error, and others will only be exposed during pilot- or early-production. These put release dates at risk, which can cause huge revenue losses.</p>\n<p>We have a few clients who only determined that they had file system issues when they did a pilot run. That prompted them to try Yaffs and get their products shipping. While we are glad they ended up with a good product, unfortunately they lost revenue and customer goodwill.</p>\n<p><i><b>Finding problems late in development creates business risk.</b></i></p>\n<p>It is thus not surprising that much of our business is repeat business. </p>\n<h1 class=\"western\" style=\"page-break-before: always\">Yaffs testing</h1>\n<p>Testing on its own does not create good software but it does help to verify that the software is working correctly.</p>\n<p>Yaffs has many automated tests that are run on a regular basis. Automated tests allow the testing to be run without human intervention, thus allowing more testing to be done.</p>\n<p>The tests are too numerous to discuss completely (see the Further Information below). W<span style=\"font-weight: normal\">e</span> highlight one: the power-fail stress test.</p>\n<p>The power-fail stress test is a test harness that uses software simulations of flash devices and some software and scripts to simulate the effects of removing power from a Yaffs-based system <span style=\"font-weight: normal\">while it is writing</span> to flash. This test is normally run for 100,0000 to 1 million power-fail simulation cycles, taking many days.</p>\n<p>This particular test suite was originally developed in 2008 during the development of some new features. The tests are very rigorous. In the beginning, this test suite would find a problem after less than 100 power fail iterations. As we identified and fixed the bugs, this number crept up and we now run millions of cycles without seeing a single problem.</p>\n<p><i><b>Yaffs survives millions of power failures in simulation test benches.</b></i></p>\n<p>In addition, many of our clients have also run hardware power failure tests, using a relay and a micro-controller to kill power to the device under test. They have been very satisfied with the results.</p>\n<p style=\"margin-bottom: 0cm; orphans: 0; widows: 0; page-break-before: auto\"><br />\n</p>\n<p><span style=\"font-size: 16pt; font-size: large; font-size: large;\"><b>Licensing</b></span></p>\n<p>Yaffs is available under GNU Public License V2, GPL2, from our git repository at <a href=\"http://www.yaffs.net/\">www.yaffs.net</a>. You may use that code for testing free of charge and for as long as you want.</p>\n<p style=\"font-weight: normal\"><i>You will be using it under the conditions of GPL2 with the obligation to release your associated source code when you start to sell or distribute a product.</i></p>\n<p style=\"font-weight: normal\"><i>We can then sell you a Licence to use Yaffs which removes that obligation and protects your intellectual property.</i></p>\n<p><i><b>With Yaffs you can try before you buy!</b></i></p>\n<h1 class=\"western\">Conclusions</h1>\n<p>Selecting a robust flash file system is key to :</p>\n<ul>\n<li>\n<p>building a successful product.</p>\n </li>\n<li>\n<p>reducing risk, warranty costs and liability.</p>\n </li>\n<li>\n<p>reducing development costs.</p>\n </li>\n</ul>\n<p><i><b>Yaffs has proven itself and can pay for itself many times over.</b></i></p>\n<h1 class=\"western\">Further information</h1>\n<p>This document is intentionally brief. There are many documents at <a href=\"http://www.yaffs.net/\">http://www.yaffs.net</a> for those that want more information, including:</p>\n<p><b>How Yaffs Works:</b> detailed description of internal design.</p>\n<p><b>Yaffs Robustness and Testing:</b> how we know Yaffs handles various flash failure scenarios.</p>\n<p><br />\n<br />\n</p>\n<p>For further information please contact <a href=\"denied:mailto:info@yaffs.net\">info@yaffs.net</a> or access <a href=\"http://www.yaffs.net/\">http://www.yaffs.net</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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Detail\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\">Documents - Detail</h1>\n\n      <nav class=\"tabs\" role=\"navigation\" aria-label=\"Tabs\">\n        <h2 class=\"visually-hidden\">Primary tabs</h2>\n  <ul class=\"tabs--primary nav nav-tabs\"><li><a href=\"/documents\" data-drupal-link-system-path=\"documents\">Main</a></li>\n<li class=\"active\"><a href=\"/documents/detail\" data-drupal-link-system-path=\"documents/detail\" class=\"is-active\">Detail<span class=\"visually-hidden\">(active tab)</span></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_2 js-view-dom-id-25f6aee311f54165ace887a5353b5396dc1032bb498cbd1674f11ba637a1f99b\">\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-2-specification\" hreflang=\"und\">Yaffs 2 Specification</a>\n<p>The initial specification for Yaffs version 2. Describes the development of Yaffs to deal with next-generation NAND chips which have larger (2Kb) pages and don\'t allow page rewrites. This newer design is be significantly faster (write: 1.5x-5x, delete: 4x, garbage collection: 2x) and has 25-50% lower RAM footfrint.</p>\n        </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=\"/internal-history-yaffs\" hreflang=\"und\">The Internal History of YAFFS</a>A brief look into the history of YAFFS through a look at the the internals.        </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=\"/comparison-between-yaffs-yaffs2-and-jffs2\" hreflang=\"und\">Comparison between Yaffs (Yaffs2) and JFFS2</a>If you are trying to decide between Yaffs and JFFS2 then this note will give you an idea of the relative advantages of each.        </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-porting-guide\" hreflang=\"und\">Yaffs Porting Guide</a>The purpose of this document is to describe how to bring up Yaffs2 on a board previously unsupported using the Yaffs Direct Interface, with an example using eCos on a Balloon board.        </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/yaffs-robustness-and-testing\" hreflang=\"und\">YAFFS Robustness and Testing</a>\n<p>This document describes some of the important design criteria and design features used to achieve a robust design suitable for modern embedded systems which need to store critical data.&nbsp; The test methodologies are also described.</p>\n        </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/YaffsRobustnessAndTesting.pdf\" type=\"application/pdf; length=143414\" title=\"Open file in new window\" target=\"_blank\" data-toggle=\"tooltip\" data-placement=\"bottom\">YaffsRobustnessAndTesting.pdf</a></span><span class=\"file-size\">140.05 KB</span></span>        </td>\n          </tr>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/running-yaffs-direct-tests\" hreflang=\"und\">Running Yaffs Direct Tests</a>\n<p>This provides a outline to the various tests that are incorporated into Yaffs Direct. Most of these tests were written as debug tools to test error response by various Yaffs functions. These and others can be used to check if Yaffs is working properly.</p>\n        </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/YaffsDirectTests.pdf\" type=\"application/pdf; length=53457\" title=\"Open file in new window\" target=\"_blank\" data-toggle=\"tooltip\" data-placement=\"bottom\">YaffsDirectTests.pdf</a></span><span class=\"file-size\">52.2 KB</span></span>        </td>\n          </tr>\n      <tr>\n                                                                                            <td class=\"views-field views-field-title views-field-body\"><a href=\"/documents/yaffs-nand-flash-failure-mitigation\" hreflang=\"und\">Yaffs NAND flash failure mitigation</a>NAND flash is one of very few types of electronic device which are knowingly shipped with errors and are expected to generate further errors without causing system failure. This document describes the most important failure modes and how they may be addressed in software.        </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/YaffsNandFailureMitigation.pdf\" type=\"application/pdf; length=235109\" title=\"Open file in new window\" target=\"_blank\" data-toggle=\"tooltip\" data-placement=\"bottom\">YaffsNandFailureMitigation.pdf</a></span><span class=\"file-size\">229.6 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; 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 has been used with many different OSs, including Linux, eCos, Windows CE, ThreadX, pSOS and vXworks. It is POSIX-compliant, so commands in an application calling POSIX functions will usually work.</p>\n\n<p>Windows CE uses the Microsoft file handling model and is not POSIX-like. The difference is handled in the Windows CE wrapper.  Contact us for more information.</p>\n\n<p>Work on closer integration of Yaffs into the Linux kernel started in 2010 and the goal is to have Yaffs merged into the mainline Linux kernel.</p>\n\n<p>The Yaffs Direct Interface, YDI, is the heart of Yaffs and usually stands between the Application, on one side, and the Flash chips, and any OS, on the other side:-</p>\n\n<h3><em>What CPU can you use with Yaffs?</em></h3>\n\n<p>Yaffs has been used with many 32-bit and 64-bit CPUs including MIPS, 68000, ColdFire, PowerPC, x86 variants and many ARM-cored CPUs. It should work with 16-bit CPUs but has not been tested.</p>\n\n<h3><em>Does Yaffs care Which-Endian the CPU is?</em></h3>\n\n<p>No, Yaffs works with Big-Endian and Little-Endian CPUs</p>\n\n<h3><em>How big can the whole file system be, and how big can individual files be?</em></h3>\n\n<p>Yaffs2, which is now standard, can handle a File System (FS) of many Gigabytes total storage; some people are using it with 6GB satisfactorily. <em>Individual</em> files are currently limited to 2GB. The basic Yaffs architecture can handle larger single files and some changes would be required to support individual files greater than 2G bytes. There is an upper limit of around 32GB with the present 2k bytes granularity of \'chunks\' or page size, and the limit of about 16 million chunks per file.</p>\n\n<p>A coarser granularity of larger chunks can probably be obtained, with knock-on effects in other parameters like RAM usage.</p>\n\n<h3><em>How many files can there be?</em></h3>\n\n<p>There is no hard limit. Available flash and RAM will limit this.</p>\n\n<h3><em>What about directories etc?</em></h3>\n\n<p>Yaffs supports many different objects including: directories, regular files, hard links, symbolic links and device nodes.</p>\n\n<p>Yaffs supports long file names, attributes, extended attributes and Unicode.</p>\n\n<h3><em>How much RAM does it need?</em></h3>\n\n<p>This depends particularly on the number of tnodes, which in turn depends on the file size, and is therefore a dynamic variable.</p>\n\n<p>However, Yaffs compares favourably with other similar systems specialised for Flash, and includes robust error handling.</p>\n\n<h4><em>How are errors handled?</em></h4>\n\n<p>Error Correction Code (ECC) is used to correct for single-bit errors.</p>\n\n<p>ECC may use built-in code or that provided from other sources (flash controllers, ECC libraries etc).</p>\n\n<p>Yaffs is frequently tested on a \"fuzzer\" test harness. This randomly corrupts bits of the file system image to check that the file system still mounts and loads correctly.</p>\n\n<h3><em>What about Multi-level cell (MLC) chips?</em></h3>\n\n<p>Because a bit is represented by a smaller amount of charge in the MLC chip compared to a SLC chip, MLC chips are more prone to corruption than SLC.</p>\n\n<p>MLC also has various write restrictions, which are obeyed by Yaffs2.</p>\n\n<p>Yaffs2 has some features such as block refreshing to help alleviate the problems associated with MLC.</p>\n\n<p>MLC generally requires multi-bit ECC. Hardware ECC is preferred since it is faster and requires less computation than software multi-bit correction..</p>\n\n<h3><em>How robust is Yaffs ?</em></h3>\n\n<p>Yaffs is designed specifically to take account of manufacturing faults in, and of accumulated wear in, individual cells, and also to handle power failures during use.</p>\n\n<p>Yaffs allocates flash blocks in a way that gives statistical or implicit wear levelling; when a block is freed up it is released into a <em>free pool</em> and the next allocation comes from this <em>free pool. </em>This randomness tends to spread the blocks in use, giving some wear levelling, rather than one part of the file always being worked intensively.</p>\n\n<p>Accelerated lifetime testing has been carried out to seek evidence for excessive wear. For example on one professional PDA-style device used by surveyors in the field we determined that extreme lifetime usage would be:</p>\n\n<ul><li>20MB per day.</li>\n	<li>200 days per year</li>\n	<li>10 year lifetime</li>\n	<li>Total 40Gbytes lifetime write.</li>\n</ul><p>We then ran well over 200Gbytes of writing through a specially designed File System Exerciser, a multi-threaded application that writes, reads, verifies, then deletes, repeatedly. There was no sign of a single bit of corruption at the end of the test.</p>\n\n<p>Another test applied randomly timed power failures repeatedly while running test code. Millions of cycles have been executed without any errors being observed.</p>\n\n<p>Yaffs is used (under GPL) in the Android mobile phones sold by Google and others. Extensive use in the field like this helps to ensure its robustness.</p>\n\n<h3><em>How big is its code?</em></h3>\n\n<p>That depends on how much of it you need; it is modular in organisation. The innermost or core part is about 11k lines of code, the the Yaffs Direct Interface giving file handle access and a Posix-like interface is around 2k lines.</p>\n\n<h3>Glossary and useful links.</h3>\n\n<table><colgroup><col /><col /></colgroup><tr><td>\n			<p>Big-endian and Little-endian</p>\n			</td>\n			<td>\n			<p>Big-endian is when the most significant data chunk is listed first. Little-endian is when the least significant data chunk is listed first.</p>\n\n			<p><em>http://en.wikipedia.org/wiki/Endianness</em></p>\n			</td>\n		</tr><tr><td>\n			<p>tnodes</p>\n			</td>\n			<td>\n			<p>Tnodes are yaffs data structures used to build trees that map from a file to the file data chunks stored in flash. A large file will have multiple data chunks scattered throughout the flash and will need a larger tnode tree.</p>\n\n			<p>See the HowYaffs Works document for more information.</p>\n			</td>\n		</tr><tr><td>\n			<p>ECC</p>\n			</td>\n			<td>\n			<p>Error correction codes, See the <em>Yaffs Error mitigation</em> document.</p>\n			</td>\n		</tr><tr><td>\n			<p>MLC</p>\n			</td>\n			<td>\n			<p>Multi-level cell, allows more than one bit state to be stored in a memory cell. MLC Flash often allows four state (ie. 2 bits) to be stored in one cell. <em>http://en.wikipedia.org/wiki/Multi-level_cell</em></p>\n\n			<p> </p>\n			</td>\n		</tr></table><p> </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 widely used with Linux, RTOSs, or no OS at all, in consumer devices and critical infrastructure. 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only a few interface functions are required. 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field--type-text-with-summary field--label-hidden field--item\"><p>If you want to use Yaffs on an Open Source project, then go ahead and <a href=\"/downloads\">download</a> the GNU General Public Licence v.2 now. You can get it straight away from the link on the right of the page.</p>\n\n<p>Yaffs is also available under a Commercial Licence for projects that don\'t want to disclose their source code.  This Licence does not have the obligations of GPL, but is perpetual, world-wide, non-exclusive and carries no continuing royalty.</p>\n\n<p>You can use the Open Source code to investigate and evaluate Yaffs, then before shipping your product to anyone outside of your organisation you buy a licence from Aleph One which does not have the GNU GPL obligation to release your Source Code.  Contact  sales@aleph1.co.uk  for more information or have a look at our <a href=\"/downloads\">licensing information</a>.</p></div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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class=\"active\">\n                  Tried and tested in millions of devices...\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>Tried and tested in millions of devices...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/tried-and-tested-millions-devices\" class=\"what-is-special-about-yaffs is-promoted full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n  <div class=\"field field--name-field-icon-text field--type-string field--label-above\">\n    <div class=\"field--label\">Icon - text</div>\n              <div class=\"field--item\">fa-mobile-phone</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Yaffs is the leading Flash file system, running in millions of devices. It\'s been used on Linux computers, in cameras, mobile phones, hard drives, and on many custom boards. People and companies trust it to keep their data safe. Read more about <a href=\"/documents/yaffs-robustness-and-testing\">how we test Yaffs in our Robustness and Testing white paper</a>.</p></div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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         </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 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class=\"active\">\n                  Yaffs is fully supported...\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>Yaffs is fully supported...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/yaffs-fully-supported\" 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-map-signs</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Yaffs support is available through the Yaffs 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class=\"active\">\n                  Yaffs is Open Source...\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>Yaffs is Open Source...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/yaffs-open-source\" 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-heart</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Yaffs is downloadable with a GNU General Public Licence v.2, as at  http://www.gnu.org/licenses/gpl-2.0.html   You get the source code, with all the benefits that brings. And of course, if you buy a commercial licence, you get the source code too, but without the encumberance of your responsibilities under the GNU GPL</p>\n\n<p>Because it\'s Open Source, you can always see what the code is doing and trace through; and having the code means you\'ll never be in a situation where you are critically dependent on us, either from a technical or a business perspective.</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=\"active\">\n                  Yaffs is a safe choice...\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>Yaffs is a safe choice...</span>\n</h1>\n\n  <article role=\"article\" about=\"/features/yaffs-safe-choice\" 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-bullseye</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>Having started in 2002 Yaffs embodies more than ten years of experience with Flash memory and its specialised needs, coupled with continued growth in the number of people and companies using Yaffs.</p>\n\n<p>Since its inception numerous features and refinements have been added. The code continues to evolve, growing in value to users whilst retaining backward compatibility. The community of users continues to grow as more and more people and companies opt to use Yaffs, providing a pool of knowledge which is accessible to new users. </p>\n\n<p>The availability of the GNU General Public Licence version means that there\'s always an exit route for open source projects, and since it\'s open-source, existing commercial projects will at the very least always have the source code and the licence to continue to use it, and likely much more. Plus commercial projects benefit from the open source experience in Yaffs - both with respect to developers and knowledge. </p>\n\n<p>Yaffs is a safe choice for any project needing a Flash file system: it has well over ten years of history, proven sustainability, a continuously improving codebase, a growing user base, and exit routes, since it will continue to be available regardless of Yaffs.net.</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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aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n\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\">The best bits</h1>\n\n  <div class=\"views-element-container form-group\"><div class=\"view view-highlighted-yaffs-features view-id-highlighted_yaffs_features view-display-id-page_1 js-view-dom-id-e3f4979459e2968b937de0087679b8fdfcfb02cfb5806497096d45cc485a9a42\">\n  \n    \n      \n      <div class=\"view-content\">\n      <div id=\"views-bootstrap-highlighted-yaffs-features-page-1\"  class=\"grid views-view-grid horizontal\">\n            <div class=\"row\">\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-thumbs-up\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"384\">Royalty Free... </h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><p><strong>100% ROYALTY FREE</strong></p>\n\n<p>Of course there\'s no royalty when you use Yaffs under the GPL; it\'s the GPL!</p>\n\n<p>Our commercial licences are paid for once at the time of buying the Licence, and so they are also royalty free. No accounting and no need to worry about increasing costs as you make or sell more units.</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-shield\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"385\">A robust flash file system...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><p>As part of our regular testing, we run power-fail tests. Whether it\'s during a read or a write, Yaffs is designed to preserve your existing data during a device power failure. And because Yaffs is open source, you can download the tests and run them yourself in the most severe conditions you expect the product to encounter. See:- http://www.yaffs.net/documents/yaffs-robustness-and-testing</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-heart\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"388\">Yaffs is Open Source...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><p>Yaffs is downloadable with a GNU General Public Licence v.2, as at  http://www.gnu.org/licenses/gpl-2.0.html   You get the source code, with all the benefits that brings. And of course, if you buy a commercial licence, you get the source code too, but without the encumberance of your responsibilities under the GNU GPL</p>\n\n<p>Because it\'s Open Source, you can always see what the code is doing and trace through; and having the code means you\'ll never be in a situation where you are critically dependent on us, either from a technical or a business perspective.</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n              </div>\n          <div class=\"row\">\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-mobile-phone\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"389\">Tried and tested in millions of devices...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><p>Yaffs is the leading Flash file system, running in millions of devices. It\'s been used on Linux computers, in cameras, mobile phones, hard drives, and on many custom boards. People and companies trust it to keep their data safe. Read more about <a href=\"/documents/yaffs-robustness-and-testing\">how we test Yaffs in our Robustness and Testing white paper</a>.</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-space-shuttle\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"407\">Booting is fast...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><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></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-users\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"408\">An active community...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><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></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n              </div>\n          <div class=\"row\">\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-cogs\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"414\">Suitable for open and closed source projects...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><p>If you want to use Yaffs on an Open Source project, then go ahead and <a href=\"/downloads\">download</a> the GNU General Public Licence v.2 now. You can get it straight away from the link on the right of the page.</p>\n\n<p>Yaffs is also available under a Commercial Licence for projects that don\'t want to disclose their source code.  This Licence does not have the obligations of GPL, but is perpetual, world-wide, non-exclusive and carries no continuing royalty.</p>\n\n<p>You can use the Open Source code to investigate and evaluate Yaffs, then before shipping your product to anyone outside of your organisation you buy a licence from Aleph One which does not have the GNU GPL obligation to release your Source Code.  Contact  sales@aleph1.co.uk  for more information or have a look at our <a href=\"/downloads\">licensing information</a>.</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-credit-card\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"415\">For closed source projects - try before you buy...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><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. Check out our documentation and videos.</p>\n\n<p>It\'s perfectly acceptable and safe to use the GNU GPL code inside your company, providing you don\'t ship a binary to anyone beyond it. That\'s when code disclosure and licensing provisions of the GNU GPL kick in. So before you do that, you\'ll want to talk to us about acquiring a paid Licence.</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-bullseye\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"416\">Yaffs is a safe choice...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><p>Having started in 2002 Yaffs embodies more than ten years of experience with Flash memory and its specialised needs, coupled with continued growth in the number of people and companies using Yaffs.</p>\n\n<p>Since its inception numerous features and refinements have been added. The code continues to evolve, growing in value to users whilst retaining backward compatibility. The community of users continues to grow as more and more people and companies opt to use Yaffs, providing a pool of knowledge which is accessible to new users. </p>\n\n<p>The availability of the GNU General Public Licence version means that there\'s always an exit route for open source projects, and since it\'s open-source, existing commercial projects will at the very least always have the source code and the licence to continue to use it, and likely much more. Plus commercial projects benefit from the open source experience in Yaffs - both with respect to developers and knowledge. </p>\n\n<p>Yaffs is a safe choice for any project needing a Flash file system: it has well over ten years of history, proven sustainability, a continuously improving codebase, a growing user base, and exit routes, since it will continue to be available regardless of Yaffs.net.</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n              </div>\n          <div class=\"row\">\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-map-signs\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"417\">Yaffs is fully supported...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><p>Yaffs support is available through the Yaffs community - primarily via the mail list - with help coming from our key developers as well as other people who use Yaffs. For those times when you don\'t feel comfortable asking a question in a public forum, perhaps because the project is sensitive, we will normally answer a few questions off-list before we offer you the opportunity of consultancy and direct access to our developers. And of course we are always willing to discuss other forms of support for customers who buy licences.</p></div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-lock\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"418\">Data is safe with Yaffs...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><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></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-stethoscope\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"426\">High and low level interfaces...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><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></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n              </div>\n          <div class=\"row\">\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-truck\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"427\">Cross-platform and portable...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><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></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-microchip\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"428\">A file system designed for Flash memory...</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\"><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></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-plug\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"433\">Predictable and performance oriented</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\">\n<p>Yaffs has highly optimised and predictable garbage collection strategies. This makes it high performance and very deterministic when compared with similar file systems.</p>\n</div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n              </div>\n          <div class=\"row\">\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-sort-amount-asc\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"434\">Memory efficiency</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\">\n<p>Yaffs has a lower memory footprint than most other log-structured Flash file systems.&nbsp; Because it is log-structured, RAM is required to build up runtime data structures for acceptable performance. As a rule of thumb, Yaffs uses approximately 2 bytes per chunk of NAND flash, where a chunk is typically one page of NAND. For NAND with 512byte pages, a budget of approximately 4kbytes of RAM per 1Mbyte of NAND is usually sensible. And for 2kbyte page devices a budget of approximately 1kbyte per 1Mbyte of NAND usually suffices.</p>\n<p>You can find out details of Yaffs memory use in the document&nbsp; <a href=\"http://www.yaffs.net/documents/how-yaffs-works\">http://www.yaffs.net/documents/how-yaffs-works</a></p>\n</div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-check-square\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"435\">Highly configurable - matches your Flash memory</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\">\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></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n                  <div class=\"col col-xs-12 col-sm-12 col-md-4 col-lg-4 \">\n            <div class=\"views-field views-field-field-icon-text\"><div class=\"field-content\"><i class=\"fa fa-puzzle-piece\"></i></div></div><div class=\"views-field views-field-title\"><span class=\"field-content\"><h3 id=\"436\">Simple to integrate</h3></span></div><div class=\"views-field views-field-body\"><div class=\"field-content\">\n<p>Yaffs Direct Interface is simple to integrate in a system – only a few interface functions are required. Yaffs also includes a POSIX interface. It has been used with Android, VXWorks, Windows, Linux, bare metal, and more; on ARM (32 and 64), x86 (32 and 64), Atmel, and more. </p>\n<p>You can find details in the Yaffs Direct guide.</p>\n</div></div><div class=\"views-field views-field-edit-node\"><span class=\"field-content\"></span></div>\n          </div>\n              </div>\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; 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=\"For experimental purposes you can grab Yaffs free of charge right now from our GIT repository.\nIf you distribute a product using Yaffs you must release all your linked source code in accordance with the GNU General Public Licence. 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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\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifBold-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifBoldItalic-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifItalic-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifRegular-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSansBoldItalic-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"shortcut icon\" href=\"/sites/default/files/yaffs_favicon.png\" type=\"image/png\" />\n<link rel=\"canonical\" href=\"/get-yaffs\" />\n<link rel=\"shortlink\" href=\"/node/382\" />\n<link rel=\"revision\" href=\"/get-yaffs\" />\n\n    <title>Get Yaffs | 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-page navbar-is-fixed-top has-glyphicons\">\n    <a href=\"#main-content\" class=\"visually-hidden focusable skip-link\">\n      Skip to main content\n    </a>\n    <div style=\"background-color: ; color: \" id=\"environment-indicator\">\n  \n    </div>\n\n              <header class=\"navbar navbar-default navbar-fixed-top\" id=\"navbar\" role=\"banner\">\n              <div class=\"container\">\n            <div class=\"navbar-header\">\n          <div class=\"region region-navigation\">\n          <a class=\"logo navbar-btn pull-left\" href=\"/\" title=\"Home\" rel=\"home\">\n      <img src=\"/themes/custom/yaffs/logo.svg\" alt=\"Home\" />\n    </a>\n      \n  </div>\n\n                          <button type=\"button\" class=\"navbar-toggle\" data-toggle=\"collapse\" data-target=\"#navbar-collapse\">\n            <span class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\" class=\"is-active\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label sr-only\">Search</label>\n  \n  \n  <div class=\"input-group\"><input title=\"Enter the terms you wish to search for.\" data-drupal-selector=\"edit-keys\" class=\"form-search form-control\" placeholder=\"Search\" type=\"search\" id=\"edit-keys\" name=\"keys\" value=\"\" size=\"15\" maxlength=\"128\" data-toggle=\"tooltip\" /><span class=\"input-group-btn\"><button type=\"submit\" value=\"Search\" class=\"button js-form-submit form-submit btn-primary btn icon-only\" name=\"\"><span class=\"sr-only\">Search</span><span class=\"icon glyphicon glyphicon-search\" aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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name=\"description\" content=\"For experimental purposes you can grab Yaffs free of charge right now from our GIT repository.\nIf you distribute a product using Yaffs you must release all your linked source code in accordance with the GNU General Public Licence. 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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\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifBold-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifBoldItalic-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifItalic-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSerifRegular-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"stylesheet\" href=\"https://yaffs.net/sites/default/files/fontyourface/fontsquirrel/LiberationSansBoldItalic-fontfacekit/fontyourface-stylesheet.css\" media=\"all\" />\n<link rel=\"shortcut icon\" href=\"/sites/default/files/yaffs_favicon.png\" type=\"image/png\" />\n<link rel=\"canonical\" href=\"/get-yaffs\" />\n<link rel=\"shortlink\" href=\"/node/382\" />\n<link rel=\"revision\" href=\"/get-yaffs\" />\n\n    <title>Get Yaffs | 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-page navbar-is-fixed-top has-glyphicons\">\n    <a href=\"#main-content\" class=\"visually-hidden focusable skip-link\">\n      Skip to main content\n    </a>\n    <div style=\"background-color: ; color: \" id=\"environment-indicator\">\n  \n    </div>\n\n              <header class=\"navbar navbar-default navbar-fixed-top\" id=\"navbar\" role=\"banner\">\n              <div class=\"container\">\n            <div class=\"navbar-header\">\n          <div class=\"region region-navigation\">\n          <a class=\"logo navbar-btn pull-left\" href=\"/\" title=\"Home\" rel=\"home\">\n      <img src=\"/themes/custom/yaffs/logo.svg\" alt=\"Home\" />\n    </a>\n      \n  </div>\n\n                          <button type=\"button\" class=\"navbar-toggle\" data-toggle=\"collapse\" data-target=\"#navbar-collapse\">\n            <span class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li class=\"active\">\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label sr-only\">Search</label>\n  \n  \n  <div class=\"input-group\"><input title=\"Enter the terms you wish to search for.\" data-drupal-selector=\"edit-keys\" class=\"form-search form-control\" placeholder=\"Search\" type=\"search\" id=\"edit-keys\" name=\"keys\" value=\"\" size=\"15\" maxlength=\"128\" data-toggle=\"tooltip\" /><span class=\"input-group-btn\"><button type=\"submit\" value=\"Search\" class=\"button js-form-submit form-submit btn-primary btn icon-only\" name=\"\"><span class=\"sr-only\">Search</span><span class=\"icon glyphicon glyphicon-search\" aria-hidden=\"true\"></span></button></span></div>\n\n  \n  \n  </div>\n<div class=\"form-actions form-group js-form-wrapper form-wrapper\" data-drupal-selector=\"edit-actions\" id=\"edit-actions\"></div>\n\n</form>\n\n  </div>\n\n  </div>\n\n        </div>\n                    </div>\n          </header>\n  \n  <div role=\"main\" class=\"main-container container js-quickedit-main-content\">\n    <div class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">Get Yaffs</span>\n</h1>\n\n  <article role=\"article\" about=\"/get-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"Get Yaffs\" class=\"hidden\"></span>\n\n\n  \n  <div class=\"content\">\n    \n            <div property=\"schema:text\" class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<h2>Licences</h2>\n<p>Yaffs belongs to Aleph One Limited. It&nbsp;is available under two licences:</p>\n<ul>\n<li>The <a href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html\">GPL Version 2</a> (GNU Public Licence, Version 2). You can try it for free under this licence, and you can use Yaffs&nbsp;in GPL licensed software.&nbsp;</li>\n<li>A proprietary, <a href=\"commercial-licences\">commercial licence</a> from Aleph One Limited, for use with proprietary, or closed-source software.&nbsp;These licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product.</li>\n</ul>\n<p>Yaffs functionality is the same under both licences, and both licences are royalty-free, but the terms of the GPL place significant obligations on<strong>&nbsp;all who&nbsp;use Yaffs under GPL</strong>. Please be certain to <a href=\"/yaffs-gpl\">understand these legal obligations</a> before distributing any software together with Yaffs.</p>\n<h2>Download options</h2>\n<p>We use <a href=\"https://git-scm.com/\">Git</a> to manage our software development.</p>\n<ul>\n<li>To browse or download code,&nbsp;<strong><a href=\"http://www.aleph1.co.uk/gitweb?p=yaffs2.git;a=summary\" target=\"_self\">access our Git repository over the web</a></strong>. This is also the best option if you are behind a firewall that does not allow direct Git&nbsp;access.</li>\n<li>To get a tarball of the top of the tree, just click \'snapshot\' for the release that you want, or to quickly obtain a snapshot of the top of the tree you can <a href=\"http://aleph1.co.uk/gitweb?p=yaffs2.git;a=snapshot;h=HEAD;\" target=\"_self\">use this URL</a>.</li>\n<li>Clone Yaffs using:</li>\n</ul>\n<pre>\ngit clone git://www.aleph1.co.uk/yaffs2\n</pre>\n<ul>\n<li>If you are a registered developer with a server account you can get read/write access using:</li>\n</ul>\n<pre>\ngit clone ssh://www.aleph1.co.uk/home/aleph1/git/yaffs2</pre>\n<p>&nbsp;&nbsp;</p>\n<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; <a href=\"denied:mailto:sales@aleph1.co.uk\">sales@aleph1.co.uk</a>&nbsp; or see our Contacts page:-&nbsp; <a href=\"http://www.aleph1.co.uk/contact\">http://www.aleph1.co.uk/contact</a></p>\n</div>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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