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关于USB-OTG 识别U盘出现的电源问题

Other Parts Discussed in Thread: AM3715

环境:AM3715 +Linux2.6.32

问题:1.调试USB-OTG时,插入U盘,出现总线电流不足以提供给设备。通过文件系统解除后可以识别?是电源芯片TWL问题还是系统问题?

            2.拔掉U盘后,再插入,已经不能再识别U盘??

如下: