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uboot 启不起来,没有任何打印信息

板子电路是参考boneblack设计的,使用ti-processor-sdk-linux-am335x-evm-02.00.00.00-Linux-x86-Install.bin中的uboot代码,config文件用am335x_boneblack_defconfig,编译后没有任何打印信息;该怎么调试呢?