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AM1808 引导问题

Other Parts Discussed in Thread: AM1808, OMAP-L138

你好,调试 AM1808系统,我用这个工具sfh_OMAP-L138.exe -flash -targetType OMAPL138 -flashType NAND   ubl_OMAPL138_NAND.bin u-boot.bin -P COM1

烧了nandflash ,提示都是成功,

但是上电出现

OMAP-L138 initialization passed!
Booting TI User Boot Loader
 UBL Version: 1.65
 UBL Flashtype: NAND
Starting NAND Copy...
No valid boot image found!
NAND Boot failed.
Aborting...

uboot 起不来?为什么? 

而且我把参考版上的nandflash拆下来,在我们自己的板子上焊上,uboot可以正常被引导。但是单独用 OMAP-L!38.exe一烧,就出现上诉提示

谢谢专家解答!