jffs2_get_inode_nodes(): Data CRC failed on NAND chip

Hi,

I've got a problem when using jffs2 filesystem on a nand flash device.

I've created a root file system image on my pc (little-endian) from /rootfs directory which contain all needed files. I burn this image into a nand flash (samsung k9f5608 - 32MB nand with 512+16 bytes per pages) on a board with a power pc processor (big-endian).

So, on the pc, i do :

# mkfs.jffs2 -p --root=/rootfs -e 16384 -b -o fs_img

My flash partitions are :

# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00400000 00004000 "Nand Flash Kernel"
mtd1: 01a00000 00004000 "Nand Flash RootFS"
mtd2: 00200000 00004000 "Nand Flash Test"

On my target, from an nfs mount root file system, i do :

# nandwrite -j /dev/mtd1 /fs_img

After that, I reboot my board and make the kernel boot from nand root file system. The first boot is ok but when i reboot one more time, I have the following message :
Empty flash at 0x0047b900 ends at 0x0047ba00 jffs2_get_inode_nodes(): Data CRC failed on node at 0x015fc000: Read 0x5a62bf55, calculated 0x349968c2

And each time I reboot, there is one message more. (I do nothing else than login and reboot)
Empty flash at 0x0047b900 ends at 0x0047ba00
Empty flash at 0x015fc268 ends at 0x015fc400 jffs2_get_inode_nodes(): Data CRC failed on node at 0x015fc000: Read 0x5a62bf55, calculated 0x349968c2
jffs2_get_inode_nodes(): Data CRC failed on node at 0x015fc778: Read 0xdf13fb17, calculated 0xbdff7e75

etc ...

Do you have any idea on what happens ?

Thanks

Frederic Janot

I have had similar problems to this. As you reboot you must make sure that root is remounted read only. If you don't a reboot can cause the JFFS2 garbage collector to be stopped mid operation. JFFS2 is verbose in error reporting. I suspect that your files are still ok. There was a bug in the JFFS2 layer which caused the garbage collector not to flush it's write buffer on remount read only. This would not screw up the filesystem but it would generate messages for uncleanly finished garbage operations. I have discussed this recently and it should be available via CVS now.

I have had discussions about the empty flash messages too. It seems it is not a problem. If the message concerns you move it to KERN_DEBUG

Hope this helps

Simon.

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Simon Haynes - Baydel
Phone : 44 (0) 1372 378811
Email : [email protected]
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