Nand dump Jffs2

[Eric]

Hi,

My Linux kernel v2.4.7-vrs1, Nand flash Sumsong k9f5608x0d (page size: 512 bytes, OOB 16 bytes, 32 pages per block, total 2048 blocks and 32M).

After I mount an erased nand flash as JFFS2 file system, I dump the flash, and I find the first page of the first block is:
0x00 85  19   3  20   c   0   0   0  b1  b0  1e  e4  ff  ff  ff  ff  
0x10 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x20 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x30 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x40 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x50 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x60 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x70 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x80 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x90 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0xa0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0xb0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x c0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0xd0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0xe0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0xf0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x100 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x110 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x120 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x130 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x140 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x150 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x160 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x170 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x180 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x190 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x1a0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x1b0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x1c0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x1d0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x1e0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
0x1f0 ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  
---OOB ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  ff  

It seems that the first 8 bytes are JFFS2 cleanmarker. However, the Linux MTD web page (http://www.linux-mtd.infradead.org/doc/nand.html) says the cleanmarker starts at offset 0x08 of OOB area.

If I use Linux kernel v2.6.21, the first block of the first page is:
0x00000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000010: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000020: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000030: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000040: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000050: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000060: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000070: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000090: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000000a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000000b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000000c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000000d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000000e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000000f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000110: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000120: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000130: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000140: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000150: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000160: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000170: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x00000190: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000001a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000001b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000001c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000001d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000001e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x000001f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
OOB Data: ff ff ff ff ff ff ff ff 85 19 03 20 08 00 00 00
 
I think this is OK.

Any idea?

Thanks and Regards
Eric