请教：烧写内核时遇到这问题该怎么办

Advanced Linux Sound Architecture Driver Version 1.0.20.
ALSA device list:
  No soundcards found.
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
lib80211: common routines for IEEE802.11 drivers
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
end_request: I/O error, dev mtdblock2, sector 0
FAT: unable to read boot sector
VFS: Cannot open root device "mtdblock2" or unknown-block(31,2)
Please append a correct "root=" boot option; here are the available partitions:
1f00             256 mtdblock0 (driver?)
1f01            3072 mtdblock1 (driver?)
1f02          257024 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2)
Backtrace:
[<c0027638>] (dump_backtrace+0x0/0x10c) from [<c02a1ff0>] (dump_stack+0x18/0x1c)
r6:c03a0e04 r5:c001e83c r4:c03a1420 r3:ffffffff
[<c02a1fd8>] (dump_stack+0x0/0x1c) from [<c02a2040>] (panic+0x4c/0x10c)
[<c02a1ff4>] (panic+0x0/0x10c) from [<c0008d6c>] (mount_block_root+0x174/0x228)
r3:ffffffff r2:00000000 r1:c381df58 r0:c032b4b8
r7:c032b520
[<c0008bf8>] (mount_block_root+0x0/0x228) from [<c0008ed8>] (mount_root+0xb8/0xf4)
[<c0008e20>] (mount_root+0x0/0xf4) from [<c000903c>] (prepare_namespace+0x128/0x180)
r6:00000000 r5:c001e851 r4:c03a0e04 r3:00000000
[<c0008f14>] (prepare_namespace+0x0/0x180) from [<c0008468>] (kernel_init+0xb8/0xe4)
r5:c001dd40 r4:c001dd40
[<c00083b0>] (kernel_init+0x0/0xe4) from [<c0039874>] (do_exit+0x0/0x61c)
r5:00000000 r4:00000000

原来如果用厂家的uboot的usb下载烧写，common_**.c结构体中,文件系统yaffs的位置不能为 0x500000 的~ 总算解决了这个.

是你的Nand Flash分区没有做好导致的。