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如果，在上电这段时间内，是不是由5728对电源芯片进行配置？
按S1超过15秒，板子会断电。不要只接电源线，看一下下面板子的使用注意事项。http://processors.wiki.ti.com/index.php/AM572x_General_Purpose_EVM_HW_User_Guide#Important_Usage_Notes
