problem with build jffs2 filesystem

[fyaowen]

Hi, all
I am running linux-2.4.2-rmk2-np2 on Assabet + Neponset.
There is total 64M flash memory on them. I have patitioned it 
as follows:
  length      device      name      
0x00040000     mtd0     bootloader   \
0x000c0000     mtd1     kernel        |
0x00300000     mtd2     ramdisk       |  on Assabet (32M)
0x01c00000     mtd3     apps         /
0x00040000     mtd4     bootloader1  \
0x000c0000     mtd5     kernel1       | 
0x00300000     mtd6     ramdisk1      |  on Neponset(32M) 
0x00e00000     mtd7     apps1         |
0x00e00000     mtd8     apps2        /

I want to make jffs2 filesystem on mtd7: 
   mkfs.jffs2 -e 0x00040000 -p -r some/dir -o jffs2.image
   (build a jffs2 image, am I right?)

   dd if=jffs2.image of=/dev/mtd7
   mount -t jffs2 /dev/mtd7 /mnt

After I gave out this instruction, all partitions on Neponset were erased. 

This is the messages from the kernel.
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00000000: 0xffff instead
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00000004: 0xffff instead
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00000008: 0xffff instead
JFFS2: Erase block at 0x00000000 is not formatted. It will be erased
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00040000: 0xffff instead
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00040004: 0xffff instead
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00040008: 0xffff instead
JFFS2: Erase block at 0x00040000 is not formatted. It will be erased
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00080000: 0xffff instead
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00080004: 0xffff instead
jffs2_scan_eraseblock(): Magic bitmask 0x1984 not found at 0x00080008: 0xffff instead
JFFS2: Erase block at 0x00080000 is not formatted. It will be erased

What's wrong with it? 
Any help is appreciated.

fyaowen

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