[Yaffs] nandwrite/nanddump question

Hi,

I have a partition that has some bad blocks and would like to dump
it to a file (including the bad block markings), then write this same
file to a good partition of the same size/type along with the bad
blocks. What I'm looking for is a byte-for-byte copy. Is this
possible with nandwrite/nanddump? I tried it but it doesn't seem to
work that way. Or maybe I don't have the right options

./nandwrite -f -y -n -o /dev/mtd2 /root/ryan.fs2.bin # done on bad NAND
./nanddump -i /dev/mtd2 > /root/ryan.fs2.test.bin # done on good NAND
cmp /root/ryan.fs2.bin /root/ryan.fs2.test.bin # different!

Thanks very much for any help.

Rick Bronson


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Here are my Linux 2.6.22 specifics:

yaffs2 version:

yaffs2-ian-20070523.tgz

NAND chip (512/16):

Flash chip found:                                                               
         Manufacturer ID: 0x98, Chip ID: 0x75 (Toshiba TC58256FT/DC)            
1 flash chips found. Total nand_chip size: 32 MB                                

kernel:

Linux acq 2.6.22-rc1 #170 Thu Jul 5 13:58:14 PDT 2007 armv4tl GNU/Linux

.config file:

CONFIG_YAFFS_FS=y
CONFIG_YAFFS_YAFFS1=y
CONFIG_YAFFS_9BYTE_TAGS=y
CONFIG_YAFFS_YAFFS2=y
CONFIG_YAFFS_AUTO_YAFFS2=y
# CONFIG_YAFFS_DISABLE_LAZY_LOAD is not set
CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS=10
# CONFIG_YAFFS_DISABLE_WIDE_TNODES is not set
# CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED is not set