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about=\"/archives/fuel-embedded-database-use-yaffs\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"FUEL Embedded Database for use with 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<p>DB FUEL and YAFFS team up to offer new generation of database and flash memory solutions for developers of Mobile Handsets and Consumer Electronics.</p>\n<p>Revolutions in flash memory technology have greatly increased the practical uses of flash technology. Aleph One Ltd, a British company focusing on embedded device development, has released YAFFS, a superior file system for storing data on flash. ITTIA is partnering with Aleph One to provide the best data solution for embedded devices requiring persistent storage. The companies have confirmed compatibility between their product lines and will work together to promote the use of their technologies.</p>\n<p>Mobile devices and embedded systems that need to store persistent information have a limited number of choices. The shock resistance, power usage and smaller form factor makes flash memory a superior storage medium in most cases. However, developers using flash face some unique challenges. For example, too many writes to the same location on the flash disk can render that location inoperable. Developers must take these and other characteristics into consideration. In order to help developers overcome these challenges, YAFFS can either be used as a filesystem driver in the operating system, or be linked directly with FUEL to bypass the operating system – even if no operating system is available. This arrangement ensures that data is stored in an optimal format to take advantage of flash memory.</p>\n<p>“We developed YAFFS to provide a high reliability/high performance embedded file system on NAND flash and are delighted that YAFFS has been selected by ITTIA as a partner for their FUEL database,” said Laurie van Someren, Aleph One’s General Manager. “We believe the products combine to provide a highly effective embedded data storage solution and look forward to further cooperation and developments.”</p>\n<p>FUEL has been designed with enough flexibility to support the unique circumstances faced by embedded developers, such as persistent storage on a battery-powered (unreliably powered) device. Because FUEL is fast and small-footprint, it is a perfect match for mobile devices and embedded systems.</p>\n<p>ITTIA and Aleph One are a natural match for other reasons as well. Both companies have a commitment to provide top-notch support at whatever level the customer needs, and can provide development services and support to ensure an optimal solution. “We begin 2006 by emphasizing on meaningful business relationship and we are delighted to announce our solution offering with Aleph One,” said Sasan Montaseri, President of ITTIA, in Bellevue, WA. “Aleph One has served the embedded market for many years and our total solution add special value to our customers.”</p>\n<p>For more information about FUEL, visit <a href=\"http://www.ITTIA.com/fuel/fuel.html\">www.ITTIA.com/fuel/fuel.html</a>.</p>\n<p>For more information about YAFFS, visit <a href=\"http://www.yaffs.net\">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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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Fri, 27 Oct 2017 01:26:31 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:8571:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"61t513Mng8MLTMLX0c2MSR46NLRdGmVeV6VWzQCQqk2Tt3fJyx6gQ-NmzK7B8clwIGQfewbnOA\">\n    <title>YAFFS talk - Slide 9 - Filesystem Design | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"61t513Mng8MLTMLX0c2MSR46NLRdGmVeV6VWzQCQqk2Tt3fJyx6gQ-NmzK7B8clwIGQfewbnOA\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>YAFFS talk - Slide 9 - Filesystem Design</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" 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 <span class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Yaffs is Open Source...\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>Yaffs is Open Source...</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/features/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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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>YAFFS talk - Slide 2 - Intro</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/yaffs-talk-slide-2-intro\" 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Fri, 27 Oct 2017 01:08:38 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:14196:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"MfUfKEHHA2KNXg6KZVxD8oij4HamDWG6eMKJpJFZoXqOn1NjUnV7irEaANs_iSB_hYusYPpQaw\">\n    <title>State of NAND MTD driver at start of project | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"MfUfKEHHA2KNXg6KZVxD8oij4HamDWG6eMKJpJFZoXqOn1NjUnV7irEaANs_iSB_hYusYPpQaw\">\n    <js-placeholder 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span property=\"schema:name\">State of NAND MTD driver at start of project</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/archives/state-nand-mtd-driver-start-project\" typeof=\"schema:WebPage\" class=\"page full clearfix\">\n\n  \n      <span property=\"schema:name\" content=\"State of NAND MTD driver at start of project\" 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<h3>Current state of NAND MTD</h3>\n<p>The current NAND MTD supports basic read/write functions. The code is hard-wired to support the NAND devices on a SPIA board. The ECC code supports 256 byte sectors.</p>\n<p>There are 3 files:</p>\n<p>nand.c: nand support algorithms. Unfortunately there is no hardware abstraction (ie. the hardware is assumed to be the SPIA board). but this is relatively easy to add.</p>\n<p>spia.c: this initialises the spia hardware to set up the addresses for the hardware access.</p>\n<p>ecc.c: ECC for 256 byte pages.</p>\n<p>What needs to be done at this level:</p>\n<ul>\n<li>\n<p>Hardware abstraction of nand.c. This allows this code to be used with different hardware configurations.</p>\n </li>\n<li>\n<p>The larger memory sizes use 512 byte pages. The memory sizes supported by 256-byte pages are obsolete. 512-byte pages are treated as two sub-pages of 256 bytes each. The Samsung code is calculation based (ie. maybe slow). The Toshiba code is table based and probably faster. Check if they are equivalent.</p>\n </li>\n<li>\n<p>Write a software emulation for a NAND device. The purpose of the software emulator is:</p>\n<ul>\n <li>\n <p>Allow debugging without the need for hardware.</p>\n  </li>\n <li>\n <p>NAND file systems need to be fault tolerant. The hardware can\'t be forced to fail to test out bad block detection/handling etc. A software emulator can be forced to fail.</p>\n  </li>\n</ul>\n </li>\n</ul>\n<p>&nbsp;</p>\n<h3>Overall flash system diagram<img alt=\"\" height=\"402\" src=\"/sites/yaffs.net/sv16516600.gif\" width=\"399\" /></h3>\n<p>A diagrammatic representation of support for SmartMedia, NAND and NOR as well as both FAT16 and JFFS2 might look like the above.</p>\n<p>The NAND flash sub-system uses common layers for:</p>\n<ul>\n<li>\n<p>hardware access</p>\n </li>\n<li>\n<p>ECC, bad block handling and low-level formatting. (based on Smart Media low-level specs). By using the same low level formatting and ECC as much as possible we gain some benefit in testing, reuse etc. The low-level formatting would differ in that fields used to store the LBA and reserved fields might be used for something else (??journaling tags??)</p>\n </li>\n</ul>\n<h3>Concerns with using JFFS2 on NAND</h3>\n<p>There are some reasons why JFFS and NAND might not work together that well.</p>\n<p>Two particular concerns re booting</p>\n<ul>\n<li>\n<p>NAND devices are typically much larger than NOR (eg. 128MB is currently a large NAND chip while 16MB would be considered a large NOR chip), thus the data structures associated with flash management are likely to be much larger. Also, JFFS2 scans the media on boot to build data structures representing the nodes in the system. This increases the boot time.</p>\n </li>\n<li>\n<p>NAND is not random access but must be read serially. This means that the scanning routine can\'t just merrily skip through the flash, instead the whole flash must be read and ECC\'d first. This slows scanning and hence booting.</p>\n </li>\n</ul>\n<p>Thus booting a 128MB NAND-based JFFS2 is likely to look something like this:</p>\n<ul>\n<li>\n<p>Read and ECC every last byte on the device even if we only need a few bytes per page for journaling headers and digest the contents. At say 5MB/second this will take ~25 seconds.</p>\n </li>\n<li>\n<p>Each node requires a 16-byte structure (struct jffs2_raw_node_ref). If nodes were 512-bytes then that\'s 4MB of RAM!</p>\n </li>\n</ul>\n<p>These are probably unacceptable for the product being used. We therefore need to run something better than this.</p>\n<p>Two approaches spring to mind:</p>\n<ul>\n<li>\n<p>Just run FAT16. ie. Just treat all NAND as SmartMedia. Benefits: one code base. Down-side: reliability.</p>\n </li>\n<li>\n<p>I\'m reluctant to store critical files in a FAT16 file system because these can be so unreliable. I\'m convinced that a journaling file system is superior. Maybe what we need is a light weight journaling file system (using common code with JFFS) modified in such a way as sidestep some of the nasty issues raised above.</p>\n </li>\n</ul>\n<p>&nbsp;</p>\n<h3>What I\'m working towards</h3>\n<p>Right now I\'m investigating the idea of trying to do something more appropriate. My current avenue of exploration is to use a journaling approach as follows:</p>\n<ul>\n<li>\n<p>The journaling records are stored in fixed-size 512-byte pages.</p>\n </li>\n<li>\n<p>The journaling tags are stored in the 16-byte-per-page \"management space\", semi-consistent with SmartMedia, using the 8 bytes of reserved space and LBA space to store journaling tags. ie something like:</p>\n </li>\n<li>\n<p>20 bits of page id within inode</p>\n </li>\n<li>\n<p>20 bits of inode id</p>\n </li>\n<li>\n<p>9 bits length (bytes used in this page).</p>\n </li>\n<li>\n<p>7 bits flags etc.</p>\n </li>\n<li>\n<p>8 bits of hamming code on this area.</p>\n </li>\n</ul>\n<p>Each page id identifies where the page fits into the file. When a page is replaced (ie file data is overwritten) a new page with the same page id is written and the old one is wiped out. During garbage collection, the pages containing valid data are copied and the wiped out data is discarded.</p>\n<p>The benefits of this approach are:</p>\n<ul>\n<li>\n<p>NAND-friendly since it works within the write limitations of NAND.</p>\n </li>\n<li>\n<p>Less stuff to read to reconstruct file structures (only read management data).</p>\n </li>\n</ul>\n<p>Down sides:</p>\n<ul>\n<li>\n<p>No compression. But is that an issue considering the target data is already compressed and NAND is far less precious than NOR (thanks to higher densities and lower price).</p>\n </li>\n</ul>\n<p>Still need to see if a new data structure is going to reduce the overhead of jffs2_raw_node_ref somewhat.</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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 <span class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Yaffs is fully supported...\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>Yaffs is fully supported...</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/features/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 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>\n      \n  </div>\n\n</article>\n\n\n  </div>\n\n              </section>\n\n                </div>\n  </div>\n\n      <footer class=\"footer container\" role=\"contentinfo\">\n        <div class=\"primary_footer row\">\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col1\">\n    <section id=\"block-yaffs-block-6\" class=\"block block-block-content block-block-content6c2d4b45-4dba-4b2d-8b9f-76701bf27533 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<ul class=\"fa-ul\">\n<li><i class=\"fa-li fa fa-phone\"></i>+44 (0)1223 811679</li>\n<li><i class=\"fa-li fa fa-envelope\"></i><a href=\"denied:mailto:info@aleph1.co.uk?Subject=Website contact\" target=\"_top\">info@aleph1.co.uk</a></li>\n</ul>\n</div>\n      \n  </section>\n\n\n  </div>\n\n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                \n            </div>\n            <div class=\"col-sm-3\">\n                  <div class=\"region region-footer-col4\">\n    <section id=\"block-footerlegal\" class=\"block block-block-content block-block-content78ab593d-35b6-4772-a141-30216e7fcbb2 clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-right\">&nbsp;<a href=\"/legal\">Legal &amp; Cookies</a></p>\n</div>\n      \n  </section>\n\n<section id=\"block-cookieinfo\" class=\"block block-block-content block-block-content4848c58d-90df-4819-81d8-0f9568eeeaac clearfix\">\n  \n    \n\n      \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\n<p class=\"text-align-justify\"><br />\nWe use <a href=\"/legal\">cookies on this site</a>. 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/documents\">Documents</a>\n              </li>\n          <li  class=\"active\">\n                  Considerations in Choosing a Flash File System\n              </li>\n      </ol>\n\n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>Considerations in Choosing a Flash File System</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/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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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Sat, 04 Nov 2017 02:30:47 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:9170:\"<!DOCTYPE html>\n<html  lang=\"en\" dir=\"ltr\" prefix=\"content: http://purl.org/rss/1.0/modules/content/  dc: http://purl.org/dc/terms/  foaf: http://xmlns.com/foaf/0.1/  og: http://ogp.me/ns#  rdfs: http://www.w3.org/2000/01/rdf-schema#  schema: http://schema.org/  sioc: http://rdfs.org/sioc/ns#  sioct: http://rdfs.org/sioc/types#  skos: http://www.w3.org/2004/02/skos/core#  xsd: http://www.w3.org/2001/XMLSchema# \">\n  <head>\n    <head-placeholder token=\"K8uXvOx2IozKC-RXktHb9171SzSeGSIUFS15YOpudI4GDtf2WWtn-MecXmHcLtt73JQcDeGupg\">\n    <title>Case history | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"K8uXvOx2IozKC-RXktHb9171SzSeGSIUFS15YOpudI4GDtf2WWtn-MecXmHcLtt73JQcDeGupg\">\n    <js-placeholder 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class=\"sr-only\">Toggle navigation</span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n            <span class=\"icon-bar\"></span>\n          </button>\n              </div>\n\n                    <div id=\"navbar-collapse\" class=\"navbar-collapse collapse\">\n            <div class=\"region region-navigation-collapsible\">\n    <nav role=\"navigation\" aria-labelledby=\"block-mainnavigation-menu\" id=\"block-mainnavigation\">\n            <h2 class=\"sr-only\" id=\"block-mainnavigation-menu\">Main navigation</h2>\n\n      \n              <ul class=\"menu nav navbar-nav\">\n                            <li>\n        <a href=\"/\" data-drupal-link-system-path=\"&lt;front&gt;\">Home</a>\n                  </li>\n                        <li>\n        <a href=\"/support\" title=\"Help for Yaffs\" data-drupal-link-system-path=\"node/380\">Support</a>\n                  </li>\n                        <li>\n        <a href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>Case history</span>\n</h1>\n\n<drupal-render-placeholder callback=\"Drupal\\block\\BlockViewBuilder::lazyBuilder\" arguments=\"0=yaffs_local_tasks&amp;1=full&amp;2\" token=\"w23j7iE363xxUJCXKAtJQdcjG4ZZoQ4QEIV26-ZdK5w\"></drupal-render-placeholder>  <article role=\"article\" about=\"/books/case-history\" class=\"book full clearfix\">\n\n  \n    \n\n  \n  <div class=\"content\">\n    \n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\"><p>An example of the application of Yaffs in a demanding environment</p>\n\n<p><strong>NASA TESS Mission </strong>This <strong>Transiting Exoplanet Survey Satellite (TESS)</strong> will discover thousands of exoplanets in orbit around the brightest stars in the sky.</p>\n\n<p>It is a project regularly using our Yaffs File System to store incoming data and preserve it, in the rigours of the space environment, before sending it back to Earth.</p>\n\n<p>In a two-year survey of the solar neighborhood, TESS will monitor more than 200,000 stars for temporary drops in brightness caused by planetary transits. This first-ever spaceborne all-sky transit survey will identify planets ranging from Earth-sized to gas giants, around a wide range of stellar types and orbital distances. No ground-based survey can achieve this feat.</p>\n\n<p>Some File Systems are not robust enough to be suitable for such exacting work.</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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