FreeBSD 5.2.1 usb problem

I have a problem with getting my usb mouse/keyboard combination running in 
FreeBSD. It's a Logitech diNovo, and although both keyboard and mouse both 
work fine under Linux I can only get the keyboard working under FreeBSD. 
The mouse is correctly recognised when booting, but is given the same usb 
device address as the keyboard. Using 'cat /dev/usm0' gives no output, and 
attempts to use /dev/usm0 reports that the device is busy. Is it possible 
to manually assign usb device addresses in order to try and work round 
this?


Mike