Assuming you can find a kernel that will boot on the beast, yes [I kept
   not being able to find such a kernel, and it started out at 0xf00000000
   or some ungodly high-moby address and it wiped my NVRAM, which I then
   reset].

FWIW, this problem has been fixed, and no one has reported overwritten
NVRAM for months now :-)
   
   # Or do I have to hook up a cable to the serial port and use it via a remote
   # machine connected to the serial port?
   
   I wasn't sure that even THAT worked right yet.

serial console on the U5 has worked since before the U5 was capable of
reading disks....


.mrg.