USB ethernet on Panda

I just built U-Boot 2012.04 for the OMAP4 PandaBoard, hoping that the USB ethernet would work. Sadly, it does not - the board hangs during the initial USB scan:

U-Boot 2012.04 (Apr 30 2012 - 18:08:55)

CPU : OMAP4430 ES2.2
Board: OMAP4 Panda

   I2C:   ready
   DRAM:  1 GiB
   MMC:   OMAP SD/MMC: 0

Using default environment

   In:    serial
   Out:   serial
   Err:   serial
   Net:   No ethernet found.

Hit any key to stop autoboot: 0
Panda # usb start
(Re)start USB...
USB: Register 1313 NbrPorts 3
USB EHCI 1.00
scanning bus for devices...

At this point, it's dead - ^C does not work, nor does the RESET button.

Any ideas how I can get this working?

------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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Interestingly, I unplugged the USB hub I had connected (in addition to the built-in SMSC95xx ethernet) and now it works. It seems that the USB scanning code is not very happy with either the hub or the mouse+keyboard I had attached. I'll try to look into this later; for now I'm happy that I can use the ethernet.

------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------