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设计了一个am335x的底板，核心板是买的，选择了从tf卡启动不了，如果不插卡，串口0间歇性打印c，每打印8个c然后停止，间隔20多s再次打印，依次类推，什么问题呢？4377.EVB-335.pdf
这是原理图，外接的led引脚目前都没有焊接
