jffs2 mount failing

Hi All,

I am facing a problem while mounting a devices to use jffs2
filesystem.
Once i erase the device, mount is successful. But if i write a file,
it is throwing some crc errors
if i unmount it and mount it again, it fails with same errors.

Can anyone tell me what is going here.

# mount -t jffs2 /dev/mtdblock3 /test/
Magic bitmask is backwards at offset 0x00000000. Wrong endian
filesystem?
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000008:
0x60f0 instead
JFFS2: Erase block at 0x00000000 is not formatted. It will be erased
Magic bitmask is backwards at offset 0x00020000. Wrong endian
filesystem?
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00020008:
0x60f0 instead
JFFS2: Erase block at 0x00020000 is not formatted. It will be erased
....
....
Magic bitmask is backwards at offset 0x007c0000. Wrong endian
filesystem?
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x007c0008:
0x60f0 instead
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x007c000c:
0x8519 instead

Further such events for this erase block will not be printed
JFFS2: Erase block at 0x007c0000 is not formatted. It will be erased
Magic bitmask is backwards at offset 0x007e0000. Wrong endian
filesystem?
jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x007e0008:
0x60f0 instead
JFFS2: Erase block at 0x007e0000 is not formatted. It will be erased
Cowardly refusing to erase blocks on filesystem with no valid JFFS2
nodes
empty_blocks 0, bad_blocks 0, c->nr_blocks 64

# eraseall /dev/mtd3
Erased 8192 Kibyte @ 0 -- 100% complete.
# mount -t jffs2 /dev/mtdblock3 /test
#cd /test
# tftp -g 10.131.17.53 -r .config
Node CRC 974d5d84 != calculated CRC 9bab4047 for node at 007c07d0
Node CRC eab4e132 != calculated CRC b1b3e1b7 for node at 007c0c70
Node CRC eab4e132 != calculated CRC b1b3e1b7 for node at 007c0c70
Node CRC eab4e132 != calculated CRC b1b3e1b7 for node at 007c0c70
.....

On Jun 25, 4:00 pm, Tarmo Kuuse <tarmo.ku....TakeThisOut@mail.ee> wrote:
> vamshi wrote:
> > I am facing a problem while mounting a devices to use jffs2
> > filesystem.
> > Once i erase the device, mount is successful. But if i write a file,
> > it is throwing some crc errors
> > if i unmount it and mount it again, it fails with same errors.
>
> > Can anyone tell me what is going here.
>
> > # mount -t jffs2 /dev/mtdblock3  /test/
> > Magic bitmask is backwards at offset 0x00000000. Wrong endian
> > filesystem?
>
> I suggest initializing the file system with mkfs.jffs2 before mounting it..
>
> I don't think you can use mkfs.jffs2 to write directly into your MTD
> device so create an image file and burn it with nandwrite.
>
> Take care to choose the same endianness as your target CPU.
>
> I also suggest padding the file system with 0xFF in full length. I have
> seen systems which end up with 0 byte values in image and mount fails.
>
> --
> Kind regards,
> Tarmo Kuuse

Thank you for your inputs, my flash is a nor chip. can i still use
nandwrite?

Regards,
Vamshi