Re: Corrupted UBIFS, bad CRC

[Artem Bityutskiy <dedekind1@gmail.com>]

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To recap the most important things - but refer to my todays reply
anyway.

1. Pick printing fixes from ubifs-v3.2
2. Find out what UBIFS tells about your max_write_size
3. Check your _real_ buffer size from your flash docs and the driver and
verify that it is correct.
4. My theory that you should have 256 ore larger NOR flash write buffer
size.
5. With the hack I sent I can mount successfully. To verify my theory
you can test with this hack and see if you can reproduce the problem. If
you can, then either write-buffer is larger than 256 or my theory is
incorrect.

BTW, here is what I used to test your image in mtdram, just for
reference:

$ sudo dmesg -c > /dev/null && sudo ./unload_all.sh && sudo modprobe mtdram total_size=29440 && sudo dd if=~/tmp/Karsten/corrupt_mtd4_20120116.img of=/dev/mtd0 && sudo modprobe ubi mtd=0 && sudo modprobe ubifs && sudo sh -c 'echo "format \"UBIFS DBG\" +p" > /sys/kernel/debug/dynamic_debug/control' && sudo mount -t ubifs /dev/ubi0_0 /mnt/ubifs

Yeah, I know it is long and ugly, I wrote it on-the-spot to quickly
debug your issue. If you need, you can decompose it.

-- 
Best Regards,
Artem Bityutskiy

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