I'm facing another problem: when U-Disk inserted, serial port always
prompts:

host wakeup event happens
usb 2-1: new high speed USB device using fsl-ehci and address 6
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new high speed USB device using fsl-ehci and address 7
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new high speed USB device using fsl-ehci and address 8
usb 2-1: device not accepting address 8, error -71
usb 2-1: new high speed USB device using fsl-ehci and address 9
usb 2-1: device not accepting address 9, error -71
hub 2-0:1.0: unable to enumerate USB device on port 1
hcd_bus_suspend
ehci_bus_suspend

Could somebody please give any hint?

Thanks and regards,
Qingwei

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