From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from web54402.mail.yahoo.com ([206.190.49.132]) by canuck.infradead.org with smtp (Exim 4.63 #1 (Red Hat Linux)) id 1IQNpg-0006KH-U7 for linux-mtd@lists.infradead.org; Wed, 29 Aug 2007 09:43:49 -0400 Date: Wed, 29 Aug 2007 06:37:02 -0700 (PDT) From: David Anders Subject: Re: Direct Access to flash chips To: "Jörn" Engel , John Klonatos In-Reply-To: <20070829103108.GD23020@lazybastard.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Message-ID: <154983.97140.qm@web54402.mail.yahoo.com> Cc: linux-mtd@lists.infradead.org, David Woodhouse List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Jörn, the alauda based card readers are getting pretty hard to find. although they work, they aren't a long term solution for accessing raw NAND flash. by far the best solution i've run across is to use the FTDI FT2232 chip to bit bang NAND flash access. there are both an opensource library and proprietary library for the FT2232 usage under linux.(see projects like OpenOCD for example usage). chip information: http://www.ftdichip.com/Products/FT2232C.htm prototype modules: http://www.dlpdesign.com/usb/2232m.shtml there are some other products that would work as well including the EZ-Usb products, however they do require custom firmware to properly access the NAND flash. http://moin.elinux.org/wiki/EzUsb there are several NAND flash vendors that have NAND flash evaluation kits that include a device for accessing NAND flash, but these are generally beyond the cost of most developers. Dave Anders > On Wed, 29 August 2007 11:30:46 +0300, John Klonatos wrote: > > > > I am new to flash technology. From what i understand so far > > in order to use the mtd layer, one must have direct access to the > > flash chip. > > If this is correct in the first place, i would like to know > > how one can achieve this kind of direct connection. I have searched > > through the web and so far nothing. I know there are card flash > > readers (SmartMedia and Xd-Picture) but what the host system see is > > the usb interface. > > So, is there a (free) platform available to make possible this > > type of direct connection. Or it is enough to use the usb > > interface/protocol. > > Olympus MAUSB-10 and Fijufilm DPC-R1 allow raw access. You can use this > driver: > http://logfs.org/~joern/patches/alauda_mtd.patch.26 > > David, any reason not to merge it? > > Jörn > > -- > In America you can have either a flimsy box banged together out of two > by fours and drywall, or a McMansion -- a flimsy box banged together > out of two by fours and drywall, but larger, more dramatic-looking, > and full of expensive fittings. > -- Paul Graham > > ______________________________________________________ > Linux MTD discussion mailing list > http://lists.infradead.org/mailman/listinfo/linux-mtd/ > ____________________________________________________________________________________ Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545469