@asian1:
* Pano logic's terminal lacks RAM.
* Coldfire => incompability problems.
* 68040, major rework. And actually only 68020+mmu or 68030 is needed for "unix".
However you could proberbly implemement some mmu and memory protection mode with the FPGA and add the needed code changes in NetBSD and make minimig run unix properly. This would not be particulary compatible however. Except maybe for m68k userland applications.
@Matt_H:
Actually asfaik, FPU is not a requirement. But at least for NetBSD/68k MMU is (and likely linux too).