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dm385 USB 无设备

Other Parts Discussed in Thread: TVP5150

我在IPNC下加入UBOOT的USB PATCH, USB0_DRV_VBUS 信号能驱动TPS2051CDBV 产生VBUS ,而在LINUX内核下,配置成HOST 开启HID  USBVIDEO 插入USB设备确没有反应,在/dev 下没有USB类的设备! USB0_DRV_VBUS 也是低电平?这是怎么回事 ?谢谢!