beagle bone. uhub2: device problem, disabling port 2

[Aleksey Cheusov <cheusov%tut.by@localhost>]

Hi. I'm trying to play with Beagle Bone but I cannot see console during
boot process.

dmesg says

    ugen0: FTDI BeagleBone, rev 2.00/7.00, addr 3

and after some delay

    uhub2: device problem, disabling port 2

cu(1) says the following

    asrock# cu -115200 -l /dev/dtyU0
    cu: /dev/dtyU0: Device not configured
    cu: link down
    asrock#

I'm completely new to embedded world. Any help?

-- 
Best regards, Aleksey Cheusov.