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href=\"/documents\" data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" 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class=\"row\">\n\n            \n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n        <ol class=\"breadcrumb\">\n          <li >\n                  <a href=\"/features\">The best bits</a>\n              </li>\n          <li  class=\"active\">\n                  Simple to integrate\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>Simple to integrate</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/simple-integrate\" 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-puzzle-piece</div>\n          </div>\n\n            <div class=\"field field--name-body field--type-text-with-summary field--label-hidden field--item\">\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>\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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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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choice...</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-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. 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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Wed, 15 Nov 2017 23:02:11 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:8615:\"<!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=\"7JQ_lDzA4Y3opd6auT7TBTQVFlTU4QjOIRsVl7ksxzEgLrz6SJ2-HbTJrODg6TBBrYb5j-Is0A\">\n    <title>YAFFS talk - Slide 15 - Garbage Collection and Threads | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"7JQ_lDzA4Y3opd6auT7TBTQVFlTU4QjOIRsVl7ksxzEgLrz6SJ2-HbTJrODg6TBBrYb5j-Is0A\">\n    <js-placeholder 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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, 01 Dec 2017 07:27:33 GMT\";}}s:15:\"\0*\0cacheControl\";a:0:{}}s:10:\"\0*\0content\";s:8558:\"<!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=\"CBd6rwp834uVJTchGorDqElhMj5II-yCfBuxhdmZavSSbcGQApjofOzb_9-MpYIojYJimtvyGA\">\n    <title>YAFFS talk - Slide 18 - YAFFS in Use | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"CBd6rwp834uVJTchGorDqElhMj5II-yCfBuxhdmZavSSbcGQApjofOzb_9-MpYIojYJimtvyGA\">\n    <js-placeholder 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data-drupal-link-system-path=\"documents\">Documents</a>\n                  </li>\n                        <li>\n        <a href=\"/get-yaffs\" data-drupal-link-system-path=\"node/382\">Download</a>\n                  </li>\n                        <li>\n        <a href=\"/about-us\" data-drupal-link-system-path=\"node/325\">About us</a>\n                  </li>\n                        <li>\n        <a href=\"/contact\" data-drupal-link-system-path=\"node/73\">Contact</a>\n                  </li>\n        </ul>\n  \n\n\n  </nav>\n<div class=\"search-block-form block block-search block-search-form-block\" data-drupal-selector=\"search-block-form\" id=\"block-searchform\" role=\"search\">\n  \n    \n      <form action=\"/search/node\" method=\"get\" id=\"search-block-form\" accept-charset=\"UTF-8\">\n  <div class=\"form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group\">\n      <label for=\"edit-keys\" class=\"control-label 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\n            \n                  <section class=\"col-sm-12\">\n\n                                      <div class=\"highlighted\">  <div class=\"region region-highlighted\">\n      \n<drupal-render-placeholder callback=\"Drupal\\Core\\Render\\Element\\StatusMessages::renderMessages\" arguments=\"0\" token=\"_HAdUpwWmet0TOTe2PSiJuMntExoshbm1kh2wQzzzAA\"></drupal-render-placeholder>\n\n  </div>\n</div>\n                  \n                \n                \n                                      \n                  \n                          <a id=\"main-content\"></a>\n            <div class=\"region region-content\">\n        <h1 class=\"page-header\"><span>YAFFS talk - Slide 18 - YAFFS in Use</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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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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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:\"Thu, 16 Nov 2017 02:01:40 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=\"FqsamJZUABGJWpDvfr4fwEQ2t1QSVGbwobpgffrULuLeNmBaOTOmdCtKbPAtDPHBjP2Qk6cEnw\">\n    <title>YAFFS talk - Slide 9 - Filesystem Design | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"FqsamJZUABGJWpDvfr4fwEQ2t1QSVGbwobpgffrULuLeNmBaOTOmdCtKbPAtDPHBjP2Qk6cEnw\">\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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charset=UTF-8\";}s:13:\"cache-control\";a:1:{i:0;s:8:\"no-cache\";}s:4:\"date\";a:1:{i:0;s:29:\"Tue, 14 Nov 2017 11:05:15 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=\"Z0K1-nA3LnwNzG7iIwWX7tnvJ4KFbSAP8sOjX7gXqBDoUXJr6zmkk1kMvXXzEKe8BcQ1eZkNCg\">\n    <title>State of NAND MTD driver at start of project | Yaffs - A Flash File System for embedded use</title>\n    <css-placeholder token=\"Z0K1-nA3LnwNzG7iIwWX7tnvJ4KFbSAP8sOjX7gXqBDoUXJr6zmkk1kMvXXzEKe8BcQ1eZkNCg\">\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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