3.0.8 fdisk -l error

[ZubairLK]

If you do an fdisk -l (the letter 'L' in lowercase) you get the following errors

[ 1052.076943] jz4780-bch jz4780-bch.0: uncorrectable errors when do request from jz4780-nand.0
[ 1052.093560] jz4780-bch jz4780-bch.0: uncorrectable errors when do request from jz4780-nand.0
[ 1052.110466] jz4780-bch jz4780-bch.0: uncorrectable errors when do request from jz4780-nand.0
[ 1052.127171] jz4780-bch jz4780-bch.0: uncorrectable errors when do request from jz4780-nand.0
[ 1052.143722] nand_do_read_ops: return -EBADMSG!
[ 1052.156056] end_request: I/O error, dev mtdblock0, sector 24
[ 1052.169310] Buffer I/O error on device mtdblock0, logical block 3
[ 1052.184283] jz4780-bch jz4780-bch.0: uncorrectable errors when do request from jz4780-nand.0
[ 1052.200971] jz4780-bch jz4780-bch.0: uncorrectable errors when do request from jz4780-nand.0

more detailed log here

http://pastebin.com/HEz6UkvW

Reproduced on 3.0.8 kernel compile boot from mmc. rootfs on mmc.
Reproduced on booting 3.0.8 from nand.

looks like when fdisk -l runs it probes devices.
it can probe the mmc driver correctly. but probing the nand device fails with dmesg outputs.

[jcowgill]

More specifically, this is caused by any reads from /dev/mtdblock0

Running this works:
dd if=/dev/mtdblock1 count=10 > /dev/null

Running this sort of works (extremely slow):
dd if=/dev/mtd0 count=10 > /dev/null

Running this fails with Input/output error
dd if=/dev/mtdblock0 count=10 > /dev/null

[aejsmith]

Reads from mtd0 can be expected to fail as it doesn't contain ECC data in the same format that the kernel uses - it contains the U-Boot SPL which uses a different ECC format required by the boot ROM.