自编译uboot和天嵌内核和文件系统问题（求大神）

自己编译的uboot，启动天嵌的已有在nand 内核 和文件系统是正常的。。但是擦除文件系统，然后再写入文件系统后，就不能够启动了。这是为什么？？？？

但是如果是通过我的uboot写入yaffs文件系统到nand 那么就挂载不成功了
注意：uboot上也像天嵌一样，（1）用1bit haming 码写入。。（2）write.yaffs格式写入。
我自己写入nand 的内核，然后读取内核，内核也能够启动，排除我编译的uboot nand启动问题。

打印下面信息。
yaffs: dev is 32505864 name is "mtdblock8" rw
yaffs: yaffs: Attempting MTD mount of 31.8,"mtdblock8"
yaffs: yaffs_read_super: is_checkpointed 0
VFS: Mounted root (yaffs2 filesystem) on device 31:8.
Freeing init memory: 248K
Failed to execute /init.  Attempting defaults...
Kernel panic - not syncing: No init found.  Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.
Backtrace:
[<c00181e0>] (dump_backtrace+0x0/0x10c) from [<c05f2250>] (dump_stack+0x18/0x1c)
r7:00000013 r6:c003f4f0 r5:c08b5250 r4:c08b5250
[<c05f2238>] (dump_stack+0x0/0x1c) from [<c05f22b8>] (panic+0x64/0x198)
[<c05f2254>] (panic+0x0/0x198) from [<c0008804>] (init_post+0x84/0xd4)
r3:fffffffe r2:00000005 r1:00000080 r0:c074dc00
[<c0008780>] (init_post+0x0/0xd4) from [<c08142fc>] (kernel_init+0xf4/0x124)
r5:c0851c30 r4:c08b42c0
[<c0814208>] (kernel_init+0x0/0x124) from [<c003f4f0>] (do_exit+0x0/0x69c)