=> usb start
starting USB...
Bus usb@31000000: generic_phy_get_bulk : no phys property
Register 1000840 NbrPorts 1
Starting the controller
USB XHCI 1.10
scanning bus usb@31000000 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
=> usb reset
resetting USB...
Host not halted after 16000 microseconds.
Bus usb@31000000: generic_phy_get_bulk : no phys property
Register 1000840 NbrPorts 1
Starting the controller
USB XHCI 1.10
scanning bus usb@31000000 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
=>