Hi
I think this is falling down on the "dd" commands.
AFAIK, "dd" will be ignoring the OOB stuff which is required by YAFFS.
Go look in the mtd tools, I think there are some nand specific tools like
damddump or some such that will also extract the OOB info.
-- Charles
On Thursday 21 October 2004 11:23, you wrote:
> I'm trying to dump an image of a YAFFS partition so that I can reload
> it later. Things are not working the way I expect. Here is an
> example of where I'm unable to copy an image onto a partition and
> mount it. Any clues for sale?
>
> 1. create a new YAFFS filesystem on mtd partition 2 using a
> pregenerated yaffs.dat file, mount it, and verify that the etc and
> home directories are listed as expected:
>
> # cd /path/to/mounted/CF/card
> # /sbin/mkyaffs /dev/mtd/2 /yaffs.dat
> # /bin/mount -n /dev/mtdblock/2 /mnt/flash0 -t yaffs
> # ls /mnt/flash0
> etc home lost+found
> #
>
> 2. unmount that and dump it to a file:
>
> # umount /mnt/flash0
> # /sbin/mkyaffs /dev/mtd/2 /yaffs.dat
> argc 3 sh 0 optcnt 1
> Erasing and programming NAND
> Erasing block at 0x080
> Erasing block at 0x0810000
> <snipping much Erasage...>
> Erasing block at 0x08354000
> OK
> # dd if=/dev/mtd/2 of=mtd2.img bs=16384
> 214+0 records in
> 214+0 records out
> #
>
> 3. copy zeros onto the partition and verify that we can't mount it
> anymore
>
> # dd if=/dev/zero of=/dev/mtd/2 bs=16384 count=214
> 214+0 records in
> 214+0 records out
> # mount -n /dev/mtdblock/2 /tmp/yaffs -t yaffs
> yaffs: dev is 7938 name is "1f:02"
> mount: Mounting /dev/mtdblock/2 on /tmp/yaffs failed: Not a directory
> #
>
> 4. copy the backup image onto the partition, try (and fail) to mount
> it, and wonder what I'm doing wrong:
>
> # dd if=mtd2.img of=/dev/mtd/2 bs=16384
> 214+0 records in
> 214+0 records out
> # /bin/mount -n /dev/mtdblock/2 /mnt/flash0 -t yaffs
> yaffs: dev is 7938 name is "1f:02"
> mount: Mounting /dev/mtdblock/2 on /tmp/yaffs failed: Not a directory
> #
>
>
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