> Wouldn't it work to use legacy mode access for console
> access all the time or would it interfere badly with
> normal interrupt driven I/O?
No, it wouldn't work.  Once the kernel USB driver starts it "owns"
the USB host controller.  Handing it back and forth between the
kernel and BIOS would be excedingly tricky, the OHCI specs have
some provision for it, but with UHCI you're out of luck.

     -- Lennart