求助，ok6410裸板不通过jlink烧写问题

roxy

我没有jlink，想直接通过uboot进行裸板实验，发现无法成功点亮led。另外led.bin是正确的，因为我把它改名为u-boot.bin,通过sd一键烧写的方法能成功点亮led
uboot的log如下：
SMDK6410 # tftp 30000000 led.bin
Found DM9000 ID:90000a46 at address 18000300 !
DM9000 work in 16 bus width
bd->bi_entaddr: 00:40:5c:26:0a:5b
[eth_init]MAC:0:40:5c:26:a:5b:
TFTP from server 192.168.111.22; our IP address is 192.168.111.11
Filename 'led.bin'.
Load address: 0x30000000
Loading: T #
done
Bytes transferred = 64 (40 hex)
SMDK6410 # nand erase 0 200000
NAND erase: device 0 offset 0x0, size 0x200000
Erasing at 0x180000 -- 100% complete.
OK
SMDK6410 # nand write.uboot 30000000 0 200000
NAND write: device 0 offset 0x0, size 0x200000
1032192 bytes written: OK
SMDK6410 #

各位帮忙看看到底哪里有问题？？？？？感谢！！！