Hi Charles,

I will continue to work on your suggestions and try to find if there is 
any problem in writing oob data which marks blocks bad.

I tried to see bad block creation in NAND using various write operation & 
my observations are as below. I hope you can put some comment on this.

Writing data through nandwrite didnot create any bad block.
steps followed:-
        1) erased all bad blocks of nand flash in u-boot.
                # nand scrub
        2) booted with ramdisk image
        3) written file to one of the nand partition using nandwrite 
command.
                 # nandwrite -a -o /dev/mtd11 /tmp/rootrfs_1.yaffs2 
 
Writing data through cp after mounting flash drive as yaffs2 marked blocks 
as bad block.
steps followed:-
        1) erased all bad blocks of nand flash in u-boot.
                # nand scrub
        2) booted with ramdisk image
        3) erased and mounted one nand partition as yaffs2.
                # flash_eraseall /dev/mtd11
                # mount -t yaffs2 /dev/mtdblock11 /mnt/src
        4) written file to nand partiton using cp command.
                # cp /tmp/rootrfs_1.yaffs2 /mnt/src/

>From above test i could understand that there is some difference in data 
written through yaffs2 and nandwrite.

Please comment on where exactly it points.

One Request :- Please put me in CC when you reply to this message as i am 
not able to directly reply from forum(not sure why). 


Thanks
Rupesh