[Yaffs] yaffs_tagscompat problem

Hi:
I have a problem :
when my kernel mount the rootfs (yaffs 1 ),there are many yaffs ecc error:

[42949455.170000] **>>yaffs ecc error unfixed on chunk 1741:0
[42949455.180000] **>>yaffs ecc error unfixed on chunk 1741:1
[42949455.180000] **>>Block 54 marked for retirement
[42949455.190000] **>>yaffs ecc error unfixed on chunk 1742:0
[42949455.190000] **>>yaffs ecc error unfixed on chunk 1742:1
[42949455.200000] **>>Block 54 marked for retirement
[42949455.200000] **>>yaffs ecc error unfixed on chunk 1743:0
[42949455.210000] **>>yaffs ecc error unfixed on chunk 1743:1
[42949455.210000] **>>Block 54 marked for retirement
[42949455.220000] **>>yaffs ecc error unfixed on chunk 1744:0
[42949455.230000] **>>Block 54 marked for retirement
[42949455.230000] **>>yaffs ecc error unfixed on chunk 1745:0
[42949455.240000] **>>yaffs ecc error unfixed on chunk 1745:1
[42949455.240000] **>>Block 54 marked for retirement

.....................


this error message is printed by yaffs_ReadChunkFromNAND(yaffs_tagscompat.c)
,yaffs_Scan call this function.
I mount the root as yaffs ( my flash chip is 512B page ,kernel
2.6.12,yaffs2 source ),
so I think whether yaffs1 tag compatible with the yaffs2 cource I use?