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无法从SD卡启动?



大家好:

       ti-processor-sdk-linux-am335x-evm-05.01.00.11

       编译配置am335x_evm_defconfig

       编译成功后,拷贝MLO和u-boot.img到SD卡中,然后将板子设置为从SD卡启动,重新上电后,串口打印:

U-Boot SPL 2011.09 (Jun 05 2015 - 11:22:05)
Texas Instruments Revision detection unimplemented
EFUSE_SMA: 0x00013C2F, max freq reg: 0X1C2F
Set MPU freq to 1000 MHz
Booting from MMC...
OMAP SD/MMC: 0
reading u-boot.img
mkimage signature not found - ih_magic = edfe0dd0
Assuming u-boot.bin ..
reading u-boot.img

       然后就停在这里,没有任何其它信息了。

       请问这是怎么回事?哪里配置可能做得不对?