The port in mtx is for a mini processor board that we have used to
build tunneling devices for people to connect to the work network
from home. We call them `bricks'. They're the size of a typical laptop
power supply and have an internal and external ethernet connector.
There are two ports in ppc, `blast' and `ucu'. The former is for the
8260 PowerQuicc II processor as used on a research experimental
cellular radio platform. The latter is for the PowerPC 750 processor
as found on one of the Lucent radio boards (which uses a saturn
chipset for ether, serial and clock).
We've done some of the work for a 8248 port and we're likely to do
an MPC860 port too.