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Subject: RE: MTD Flash Howto ?
From: Lee Revell <rlrevell@joe-job.com>
To: "Ned W. Rhodes" <ned@softwaresystemsgroup.com>
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Date: Fri, 11 Aug 2006 17:26:34 -0400
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Cc: Leonid <Leonid@a-k-a.net>, linuxppc-embedded@ozlabs.org
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On Fri, 2006-08-04 at 10:20 -0400, Ned W. Rhodes wrote:
> The book Building Embedded Linux Systems has a good section on the use of
> flash file systems.
> 
> When you boot, you will see something like this, depending on the type of
> flash driver you have. Make sure you have defined your mtd map in
> kernel/drivers/mtd/map.
> 
> JFFS2 version 2.2. (NAND) (C) 2001-2003 Red Hat, Inc.
> JFS: nTxBlock = 965, nTxLock = 7720
> 

Is JFFS2 required to mount MTD devices?

Everything seems to be set up correctly here:

S29GL512N MirrorBit Flash: probing 16-bit flash bus
S29GL512N MirrorBit Flash: Found 1 x16 devices at 0x0 in 16-bit bank
 Amd/Fujitsu Extended Query Table at 0x0040
S29GL512N MirrorBit Flash: CFI does not contain boot bank location.
Assuming top.
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
Creating 2 MTD partitions on "S29GL512N MirrorBit Flash":
0x00000000-0x02a00000 : "Raw Area"
ftl_cs: FTL header not found.
0x02a00000-0x02b80000 : "User FS"
ftl_cs: FTL header not found.
blkmtd: version $Revision: 1.24 $
blkmtd: error: missing `device' name

cat /proc/mtd:

dev:    size   erasesize  name
mtd0: 02a00000 00020000 "Raw Area"
mtd1: 00180000 00020000 "User FS"

cat /proc/partitions:

major minor  #blocks  name

  31     0      43008 mtdblock0
  31     1       1536 mtdblock1

~ # ls -al /dev/mtdblock[01]
brw-r--r--    1 root     0         31,   0 Aug 11 14:27 /dev/mtdblock0
brw-r--r--    1 root     0         31,   1 Aug 11 14:27 /dev/mtdblock1

As you can see the major and minor numbers are correct, but I cannot
mount the MTD partitions:

~ # mount -t minix /dev/mtdblock1 foo
mount: Mounting /dev/mtdblock1 on /foo failed: No such device

What am I doing wrong?

Lee