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error using usb port

I'm using an am/dm37x  Evaluation Module with Linux (angstrom) sd card coming with the board.

When I connect an usb device (keyboard/mouse) into the usb port I get this error on console trace:

hub 2-0:1.0: Cannot enable port 2.  Maybe the USB cable is bad?
hub 2-0:1.0: Cannot enable port 2.  Maybe the USB cable is bad?
hub 2-0:1.0: Cannot enable port 2.  Maybe the USB cable is bad?
hub 2-0:1.0: unable to enumerate USB device on port 2

and the device is unusable.

I built an angstrom image on the Narcissus web site with this configurartion:

Machine: dm37x-evm

Image name: firefox-inside-dm37x-evm

Image type: tgz

Additional Packages:

angstrom-task-gnome

angstrom-uboot-scripts

bash-sh

fennec

firefox

gecko-mediaplayer-firefox-hack

initscripts

shadow

sysvinit

sysvinit-pidof

u-boot

x-load

and I got the same error:
hub 2-0:1.0: Cannot enable port 2.  Maybe the USB cable is bad?
hub 2-0:1.0: Cannot enable port 2.  Maybe the USB cable is bad?

hub 2-0:1.0: unable to enumerate USB device on port 2.

Our goal is to test fennex/firefox web browser include into angstrom on the evaluation board.

Please suggest us how to solve this hung.

Thanks in advance