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求助!AM3352 SD卡启动无法启动!

各位大神:大家好!

       购买的BEAGLEBONE BLACK板可以SD卡启动。后面我们自己开发的板,电源正常,串口能打印C,BOOT模式11100,插入SD卡后,检测脚为低,CLK口也能检测到波形,每3S左右。但就是无法SD卡启动,始终在打印CCCC。一样的笔记本一样的SD卡。可能是什么原因呢?原理图如下:

8306.8_KW_CCSK_OTHER.pdf