I'm getting to work on a PowerPC-based NAS appliance, based around an MPC8241 micro. There appears to be a standard 16-pin COP port on the board. Apparently nobody else in the entire universe has ever used this port, though.
I have a (genuine Macraigor! Accept no substitutes!) JTAG wiggler that was originally bought for ARM development, and has the standard 20-pin ARM header. However, the wiggler PCB has (stuffed) connectors for SuperH and also COP, and I'm wondering if I can simply add the appropriate 16-pin ribbon cable and use it on my PowerPC target.
One thing that puzzles/concerns me is power for the wiggler. The target is missing its series current-limiting resistor on Vtarget, so I'll have to put something on those pads if the wiggler needs target power. The wiggler PCB has a three-pin jumper strip that appears to have something to do with selecting onboard or target voltage levels on the output buffers. But there is no shorting block on either of those pins (and I know the wiggler works properly, at least on 3.3V ARM targets).