📄 yaffs_on_mtd.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD> <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=iso-8859-1"> <TITLE></TITLE> <META NAME="GENERATOR" CONTENT="StarOffice/5.2 (Linux)"> <META NAME="CREATED" CONTENT="20020517;23103700"> <META NAME="CHANGEDBY" CONTENT=" "> <META NAME="CHANGED" CONTENT="20021126;14003000"></HEAD><BODY><H2 ALIGN=CENTER>Running up YAFFS using the MTD interface</H2><P>Here are the steps required to get YAFFS going with theNANDemulation MTD that I have written.</P><P><FONT COLOR="#800000"><FONT SIZE=4 STYLE="font-size: 16pt"><I><U><B>Warning:This is experimental stuff that plugs into the kernel. It has onlybeen lightly tested. Don't play with this on a box you are notprepared to reboot.</B></U></I></FONT></FONT></P><P>There are a few things you need to do. This document assumes thatyou're working from the 2.4.18 kernel code base.</P><H3>Preparing the kernel</H3><P>First off, you need to patch the mtdcore services.</P><OL> <LI><P>Replace the mtd files with the latest from the mtd cvs. This fixes problems where special NAND functions are not being copied through the partition handler. </P> <LI><P>Build the kernel including the following configurations to support mtd.</P></OL><P STYLE="margin-left: 2cm">CONFIG_MTD=y Turn on MTD support</P><P STYLE="margin-left: 2cm">CONFIG_MTD_PARTITIONS=y Turn on partitionsupport</P><P STYLE="margin-left: 2cm">CONFIG_MTD_CHAR=y Need char drivers toaccess the data from user space.</P><P STYLE="margin-left: 2cm">CONFIG_MTD_BLOCK=y Block driver interfaceused only to find the device for mounting</P><P STYLE="margin-left: 2cm">may as well also set:</P><P STYLE="margin-left: 2cm">CONFIG_MTD_DEBUG=y</P><OL> <P>CONFIG_MTD_DEBUG_VERBOSE=3</P></OL><H3 ALIGN=LEFT>Setting up yaffs</H3><OL> <LI><P>Run the mtd utility MAKEDEV to make the /dev/mtdxxx entries.</P> <LI><P>Load up the NANDemul MTD by typing<BR><FONT FACE="Courier, monospace">#/sbin/insmod mtdemul/nandemul.o</FONT><BR>You should now be able to see the device in the mtd list by typing <BR>#<FONT FACE="Courier, monospace">cat /proc/mtd</FONT><BR>If all is well, the device will now be accessible as <FONT FACE="Courier, monospace">/dev/mtd0</FONT> and <FONT FACE="Courier, monospace">/dev/mtdblock0</FONT> (or whatever).</P> <LI><P>Now load up the yaffs filesystem module by typing<BR><FONT FACE="Courier, monospace">#/sbin/insmod mtdemul/yaffs.o<BR><FONT FACE="Times, serif">You should now be able to see the yaffs file systems by typing</FONT><BR>#cat /proc/filesystems</FONT></P> <LI><P><FONT FACE="Times, serif">Now create a mount point:<BR><FONT FACE="Courier, monospace">#mkdir /mnt/y</FONT></FONT></P> <LI><P><FONT FACE="Times, serif">Mount the file system:<BR><FONT FACE="Courier, monospace">#mount -t yaffs /dev/mtdblock0 /mnt/y</FONT></FONT></P> <LI><P><FONT FACE="Times, serif">Well if that all worked you have YAFFS running on the /mnt/y mount point using the NANDemul mtd.</FONT></P></OL><H3>What about real NAND?</H3><P><FONT FACE="Times, serif">You might want to try getting going on areal NAND device.</FONT></P><P><FONT FACE="Times, serif">I have not yet done this, but theNANDemul tests out the mtd interface so in theory it should work onreal NAND too.</FONT></P><P><FONT FACE="Times, serif">Note though that since YAFFS applies theECC and verify, it does not expect the NAND device to be applying ECCor verification. </FONT></P><P><FONT FACE="Times, serif">You probably need to configure the NANDwith the following disabled:</FONT></P><P><FONT FACE="Times, serif">CONFIG_MTD_NAND_ECC</FONT></P><P><FONT FACE="Times, serif">CONFIG_MTD_NAND_VERIFY_WRITE</FONT></P><P><FONT FACE="Times, serif">Nick Banes has had YAFFS working on realNAND, with a few issues. </FONT></P><P><BR><BR></P><P><FONT FACE="Times, serif">$Id: yaffs_on_mtd.html,v 1.3 2002/11/26 01:15:38 charles Exp $</FONT></P><P><BR><BR></P><P><BR><BR></P><P><BR><BR></P></BODY></HTML>⌨️ 快捷键说明
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