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应用AM335x,不能启动

首先,电路设计部分,是复制之前的成功电路设计,启动配置也与其相同,外接SD卡,因目前这块电路设计与之前完全相同,故软件部分也完全不用更改,上电启动后,显示CCCCC_,然后就不再启动,请问这是什么原因啊?是芯片有问题么?

经测,ARM的供电电源输出均正确,启动ARM后,电流也有200mA的变化,可是系统就是不能完全启动