USB Debug Port for KGDB

["matthew sporleder" <msporleder%gmail.com@localhost>]

Capability register at 0x58
 type: 0x0a (Debug Port)

I'm interested in exploiting my usb port as an outlet for kgdb and was
wondering if anyone had any ideas on how to make this work (I don't
have serial on anything anymore).  Does a driver need to be written to
attach com to that usb port?  Does it just work?

Any hints are appreciated.
Matt