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AM3352从SD卡启动问题

Other Parts Discussed in Thread: AM3358, AM3352

设计了一块AM3352板卡,参考beagleboard AM3358板卡,利用beagleboard AM3358板卡的SD卡来启动AM3352板卡,一直启动不了,通过示波器测试SD的一个数据线,看到有一小段波形,之后就消失了。该AM3352板卡可以通过串口能够进行启动,而通过SD卡则不能启动,不知道问题出在哪里?对比了一下自己设计的板卡与beagleboard AM3358板卡,发现SD接口有一个MMC0_SDCD管脚,我连接到了MMC0_SDCD/GPIO3_14,而beagleboard AM3358板卡连接到MMC0_SDCD/GPIO0_6,不知这是否有影响,另外,还有什么可能导致不能从SD卡启动?请教各位!!!!