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我在使用AM3358时，出现一个usb接口的问题，usb接2.0协议的u盘可以识别并且能读写，接3.0的u盘就识别不了，报协议错误，能否帮忙看下。非常感谢。
错误的时候log如下：
[ 225.596241] usb 2-1: new high-speed USB device number 12 using musb-hdrc
[ 225.716354] usb 2-1: device descriptor read/64, error -71
[ 225.946256] usb 2-1: device descriptor read/64, error -71
[ 226.176328] usb 2-1: new high-speed USB device number 13 using musb-hdrc
[ 226.316247] usb 2-1: device descriptor read/64, error -71
[ 226.546275] usb 2-1: device descriptor read/64, error -71
[ 226.776382] usb 2-1: new high-speed USB device number 14 using musb-hdrc
[ 226.807217] usb 2-1: device descriptor read/8, error -71
[ 226.937088] usb 2-1: device descriptor read/8, error -71
[ 227.166337] usb 2-1: new high-speed USB device number 15 using musb-hdrc
[ 227.187235] usb 2-1: device descriptor read/8, error -71
[ 227.317174] usb 2-1: device descriptor read/8, error -71
[ 227.426315] usb usb2-port1: unable to enumerate USB device
[ 380.876347] usb 2-1: new high-speed USB device number 16 using musb-hdrc
[ 381.006249] usb 2-1: device descriptor read/64, error -71
[ 381.236374] usb 2-1: device descriptor read/64, error -71
[ 381.466246] usb 2-1: new high-speed USB device number 17 using musb-hdrc
[ 381.586332] usb 2-1: device descriptor read/64, error -71
[ 381.816242] usb 2-1: device descriptor read/64, error -71
[ 382.046381] usb 2-1: new high-speed USB device number 18 using musb-hdrc
[ 382.077156] usb 2-1: device descriptor read/8, error -71
[ 382.207185] usb 2-1: device descriptor read/8, error -71
[ 382.436246] usb 2-1: new high-speed USB device number 19 using musb-hdrc
[ 382.457182] usb 2-1: device descriptor read/8, error -71
[ 382.587090] usb 2-1: device descriptor read/8, error -71
[ 382.696477] usb usb2-port1: unable to enumerate USB device
Shine：
AM335x不支持USB3.0协议，无法连接USB3.0设备。
