From laurie@aleph1.co.uk Thu Jun 18 09:23:42 2009 Received: from [213.165.225.113] (helo=knossos) by stoneboat.aleph1.co.uk with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.69) (envelope-from ) id 1MHCuK-00047W-5t; Thu, 18 Jun 2009 09:23:42 +0100 Received: from dellbox ([194.70.44.5]) by knossos with esmtp (Exim 4.69) (envelope-from ) id 1MHCuI-0006GF-RW; Thu, 18 Jun 2009 09:23:38 +0100 From: Laurie van Someren To: yaffs@lists.aleph1.co.uk Content-Type: text/plain Organization: Aleph One Ltd Date: Thu, 18 Jun 2009 09:23:37 +0100 Message-Id: <1245313418.6249.25.camel@dellbox> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 213.165.225.113 X-SA-Exim-Mail-From: laurie@aleph1.co.uk X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on stoneboat.aleph1.co.uk X-Spam-Level: X-Spam-Status: No, score=-2.5 required=5.0 tests=AWL,BAYES_00,RDNS_NONE autolearn=no version=3.2.5 X-SA-Exim-Version: 4.2.1 (built Wed, 25 Jun 2008 17:14:11 +0000) X-SA-Exim-Scanned: Yes (on stoneboat.aleph1.co.uk) Subject: [Yaffs] Small NAND chips becoming extinct X-BeenThere: yaffs@lists.aleph1.co.uk X-Mailman-Version: 2.1.11 Precedence: list List-Id: Discussion of YAFFS NAND flash filesystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Jun 2009 08:23:43 -0000 Hello! Since some manufacturers are ceasing to produce NAND Flash chips with a page size of 512 Byte, we have had a couple of enquiries recently about the impact of this on use of YAFFS. The original version of YAFFS works with chips of 512B page size, but not larger. When manufacturers introduced chips with a larger page size we adapted YAFFS to accommodate them, and the revised version was called YAFFS2. This version (and its successors) work with larger page sizes, such as the 2kB- and 4kB-page chips now common. If you want to create larger 'virtual pages' of 8kB- or 16kB you can do so and YAFFS2 will work with them (and you will have fewer pages in total). YAFFS2 using in-band tags also works with pages sizes of 512B and greater. Separately, if you are interested in using YAFFS with Windows CE please let us know, as we are testing a 'wrapper' to make this easier. LvS -- Laurie van Someren Aleph One Ltd Old Courthouse Bottisham CAMBRIDGE CB25 9BA UK t: +44 (0)1 223 811 679 www.aleph1.co.uk