PXA310 U2DC Controller support

[éé]

Hi, Robert
     I'm woking with a board which integrated PXA310 on it. While
Debugging U2DC controller, found that once U2DC Controller have been
started, It couldn't be stopped completely.  The windows shows unknown
device while Stopping U2DC and Usb line haven't been unplugged from PC

     Have you ever meet the problem? or could you give me some advice?
or you  have the right procedure to stop U2DC?

Thank you very much
waiting for your reply

-- 
Best Regards.