transfer jffs2 rootFS to Nand flash

Saravanan Chanemouganandam schane at
Wed Aug 29 10:10:50 EDT 2007

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"

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

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=, mask=, gw=,
     host=cm-x270, domain=, nis-domain=(none),
     bootserver=, rootserver=, 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

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


More information about the linux-mtd mailing list