NAND flash mounting problem

[Indrek Kruusa]

Ühel kenal päeval (kolmapäev 28 veebruar 2007 9:52 am) kirjutas doodiexx 
doodiexx:
> Hi,
>
> We are using Atmel's AT32AP7000 processor and ST 512Mbit NAND Flash
> and having problems in creating a JFFS2 fs.
>
> The mtd system detects the flash and I think everything is fine with
> the kernel startup:
>
> NAND device: Manufacturer ID: 0x20, Chip ID: 0x76 (ST Micro NAND 64MiB
> 3,3V 8-bit)
> Scanning device for bad blocks
> Bad eraseblock 2995 at 0x02ecc000
> Bad eraseblock 4078 at 0x03fb8000
> Creating 1 MTD partitions on "NAND 64MiB 3,3V 8-bit":
> 0x00000000-0x04000000 : "rootfs"
>
> I try to flash_eraseall -j and it completes without any error, but
> when I try to mount it I get :
> # mount /dev/mtd1 /mnt/nand
> mount: mounting /dev/mtd1 on /mnt/nand failed

Is it busybox? The error message is not too verbose. I suppose you missed -t 
jffs2 here. This and other nice hints can be found:

http://linux-mtd.infradead.org/faq/jffs2.html

cheers,
Indrek



>
> nanddump gives:
>
> # ./nanddump -l 512 -p /dev/mtd1
> Block size 16384, page size 512, OOB size 16
> Dumping data starting at 0x00000000 and ending at 0x00000200...
> 0x00000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> <skipping.., all values are ff >
> 0x000001f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>   OOB Data: ff ff ff ff ff ff ff ff 19 85 20 03 00 00 00 08
>
> The 1985 and 2003 parts seem to be wrong endian ??
>
> Any ideas to solve the problem ?
>
> The processor is big endian,
> kernel version 2.6.18
> flash_eraseall is from the git repo at git.infradead.org/mtd-utils.git
> busybox version is the latest (1.4.1)
>
> BR,
> J.Doo
>
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