Beagleboard B7 USB OTG Host Mode

Hi,

Today I found my Beagleboard (B7) again and wanted to try a current
Angstrom build. The board boots fine but how do I get USB working now?
I tried to find a clue here one the list. I know that it is because of
the newer C revision boards. Do I need to build a kernel for my B7
board with OTG host mode support?

"cat /sys/devices/platform/musb_hdrc/mode" returnes after startup
"b_idle" and I see that the g_cdc module is loaded. After "echo host>/
sys/devices/platform/musb_hdrc/mode" the mode does not change. After
removing the g_cdc module the state changes to "UNDEFINDED" and
setting the mode to host does also not work.

I'm using a working USB-OTG cable as USB was working before (with
older images that I don't have any more).