how to force beagle board to do a USB re-enumeration with PC from command line without power cycle?

Hi,

Does anyone know if it is possible to force beagle board to do a USB
re-enumeration with PC from command line without power cycle?

My situation is like this: my beagle board is a modified one with a
different PHY, I guess the USB re-enumeration has to do the IC's
interrupt. I have not sort out the interrupt yet, so for the time
being, I need the capability to force my modified beagleboard to re-
enumerate with host PC at user's choice after the USB cable is
unplugged and plugged again.

Is this possible? preferably from command line.

Thank you very much

chuqdd