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omapl138-lcdk 开发板,OTG只识别一次是为什么?

我们照着TI开发板画的自己板子,发现USB OTG 做主的时候,插入U盘,只有第一次可以识别,之后再次插拔就没反应了,不管插入鼠标,还是其他设备效果都一样。于是把TI的开发板又跑起来,发现OTG同样现象,都是用的TI SDK里面的uboot和kernel、rootfs。