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OK335xD板子启动不了Uboot



用tftp移植嵌入式linux系统,并修改了NANDFLASH分区,启动超级终端

在终端Uboot中,清除nandflash的数据,并从内存写入nandflash

完成这些操作之后,重新启动了了Uboot,然后出现如下:

U-Boot SPL 2011.09-00000-g2cfed4f-dirty (Jan 23 2014 - 09:43:37)
Texas Instruments Revision detection unimplemented
Booting from NAND...
mkimage signature not found - ih_magic = 40000506
Assuming u-boot.bin..

一直卡在这里,就执行不下去了,不知道是怎么回事

希望大神帮忙看下,小弟感激不尽