transfer jffs2 rootFS to Nand flash

Saravanan Chanemouganandam
2007-08-29T14:11:27Z

Hi all,

I am fascing problem in mounting jffs2 root file system on the cm-x270 board
after flashing the jffs2 root file system image on to the MTD Nand partition
with the following steps....

1. boot cm-x270 with NAND, NOR and JFFS2 drivers built into kernel
2. mounted root file system via "nfs"
3. checked the partitions
cm-debian:~# cat /proc/partitions
major minor #blocks name
254 0 513576 nand
31 0 4096 mtdblock0 ( NOR)
31 1 524288 mtdblock1 (NAND)
cm-debian:~# cat /proc/mtd
dev: size erasesize name
mtd0: 00400000 00010000 "phys_mapped_flash"
mtd1: 20000000 00020000 "cmx270-0"
cm-debian:~#

4. cm-debian:~#flash_eraseall -j /dev/mtd1

5. on the host created jffs2 rootfs image using #mkfs.jffs2 -r cmrootfs -n -o
cmrootfs.img -e 0x20000 --pad=0x20000000

6. copied cmrootfs.img to the cm-x270 board

7. on the cm-x270, flashed rootfs image using mtd-utilities
cm-debian:~# nandwrite /dev/mtdblock1 /mnt/net/cmrootfs.img
.....
Writing data to block 1ffe0000
Data did not fit into device, due to bad blocks
: Success
cm-debian:~#

8. Tested the jffs2 rootFS using mount
cm-debian:~# mount -t jffs2 /dev/mtdblock1 /mnt/test

cm-debian:/mnt/net# ls /mnt/test
bin dev home lib media opt proc sbin sys usr
boot etc initrd lost+found mnt packages.txt root srv tmp var

After reboot, I am getting the kernel panic with boot option for root as
root=/dev/mtdblock1 rootfstype=jffs2"

...
...
IP-Config: Complete:
device=eth0, addr=192.168.6.202, mask=255.255.255.0, gw=192.168.6.1,
host=cm-x270, domain=, nis-domain=(none),
bootserver=192.168.6.1, rootserver=192.168.6.1, rootpath=
Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes
empty_blocks 0, bad_blocks 8, c->nr_blocks 4096
VFS: Cannot open root device "mtdblock1" or unknown-block(31,1)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(31,1)

Could anyone please tell me where I am wrong ? and why is the JFFS doesn't
mount the file system?

Thanks
Sara