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am335x uboot usb start

In the uboot when I call the 'usb start' more than once, following error occurred.

Will inevitable?

U-Boot# usb start
(Re)start USB...
USB0:   scanning bus 0 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
U-Boot# usb start
(Re)start USB...
USB0:  
lowlevel init failed
USB error: all controllers failed lowlevel init

 

My environment:

 u-boot-2014.07-g7e537bf

 am335x_evm_spiboot_config