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How to generate a reverse rootfs.jffs2 ?

Hello guys,

I need to generate a reverse rootfs from my device and i'm using this command.

# mount -t jffs2 /dev/mtdblock4 /opt
# mkfs.jffs2 -r /opt -p -o /media/card/rootfs.jffs2 -e 128 --no-cleanmarkers

But when i turn on my device i look many messages like:

...bch correct(4 512 byte)
...bch correct(2 512 byte)
...bch correct(2 512 byte)
...bch correct(2 512 byte)
...bch correct(2 512 byte)
...bch correct(1 512 byte)
...bch correct(1 512 byte)
...bch correct(3 512 byte)
mtd->read(0x7c8 bytes from 0x37fc838) returned ECC error
...bch correct(3 512 byte)
mtd->read(0x835 bytes from 0x37fc000) returned ECC error
...bch correct(3 512 byte)
...bch correct(1 512 byte)
...bch correct(3 512 byte)
...bch correct(1 512 byte)
...bch correct(1 512 byte)
...bch correct(1 512 byte)
...bch correct(1 512 byte)
...bch correct(2 512 byte)
...bch correct(2 512 byte)
...bch correct(4 512 byte)
...bch correct(4 512 byte)

What does it wrong ?

Thanks