This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

am3352 uboot中usb0当做host使用,USB0_DRVVBUS一直输出低电平



在uboot中,配置usb0和usb1都为host模式,实际测试只有usb1能够正常识别u盘,测量引脚电平发现USB0_DRVVBUS引脚输出低电平,而USB1_DRVVBUS能够正常输出高电平。因USB0_DRVVBUS为低导致无法给U盘设备上电。

usb phy已经配置上电,在uboot中读取usb0 usb1 phy电源配置寄存器如下:

=> md 0x44e10620 1
44e10620: 3c186004                               .`.<
=> md 0x44e10628                                     
44e10628: 3c186004                               .`.<