JFFS2 mount problem on NAND flash

Sameer
2008-01-03T13:22:51Z

Hi,
I am working on omap based board with 16bit, small page Samsung NAND of size 64MB.
I have enabled hardware ecc functionality in the driver code. To test the functionality I run the
Following tests.
1. When the kernel comes up, >>cat /proc/mtd
mtd0: 00040000 00020000 "bootloader"
mtd1: 00020000 00020000 "params"
mtd2: 00200000 00020000 "kernel"
mtd3: 03da0000 00020000 "filesystem"
mtd4: 00080000 00004000 "NAND-X-Loader"
mtd5: 00080000 00004000 "NAND-U-Boot"
mtd6: 00040000 00004000 "NAND-U-Boot Environment"
mtd7: 00400000 00004000 "NAND-Kernel"
mtd8: 03ac0000 00004000 "NAND-File System"
2. I erase the NAND flash filesystem partition
./flash_eraseall /dev/mtd8
This function passes. I have verified the erase functionality using the debugger.
3 mount -t jffs2 /dev/mtdblock8 /mnt/nand. I have enabled the low level jffs2 fs debugging
Following is the error message

JFFS2: Erase block at 0x00000000 is not formatted. It will be erased
JFFS2: Erase block at 0x00004000 is not formatted. It will be erased
JFFS2: Erase block at 0x00008000 is not formatted. It will be erased
JFFS2: Erase block at 0x0000c000 is not formatted. It will be erased
JFFS2: Erase block at 0x00010000 is not formatted. It will be erased
JFFS2: Erase block at 0x00014000 is not formatted. It will be erased
JFFS2: Erase block at 0x00018000 is not formatted. It will be erased
JFFS2: Erase block at 0x0001c000 is not formatted. It will be erased
-----
=----
upto--

JFFS2: Erase block at 0x03a9c000 is not formatted. It will be erased
JFFS2: Erase block at 0x03aa0000 is not formatted. It will be erased
JFFS2: Erase block at 0x03aa4000 is not formatted. It will be erased
JFFS2: Erase block at 0x03aa8000 is not formatted. It will be erased
FFS2: Erase block at 0x03aac000 is not formatted. It will be erased
JFFS2: Erase block at 0x03ab0000 is not formatted. It will be erased
JFFS2: Erase block at 0x03ab4000 is not formatted. It will be erased
JFFS2: Erase block at 0x03ab8000 is not formatted. It will be erased
JFFS2: Erase block at 0x03abc000 is not formatted. It will be erased
Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes
mpty_blocks 0, bad_blocks 0, c->nr_blocks 3760
mount: Mounting /dev/mtdblock8 on /mnt/nand failed: Input/output error

But when I enable the SW_ECC functionalilty I am able to mount the jffs2 fs and perform the fs operations

I am beginner for JFFS2 fs.Could you please let me know what causes this error.

Regards,
-Sameer