It should be fairly simple to tailor this distribution for any Coldfire architectures. A few changes to the address space set up logic should do the trick. Data bus width may also necessitate some changes, but those should be fairly minor.
How about the rest of us using something other than the Coldfire processors (can't blame you!)? Well, the assembly start up code is less than 300 lines long (including comments). It should not take too long to rewrite that part for another architecture. The UART logic (uart.h and uart.c) combine to less than 300 lines also. Portions of gdb-rsp.c needs to be modified to handle the architecture dependent exception/interrupt logic, and this part is probably the most difficult.
If you do plan to port gdb-rsp-mon to another architecture, I would really appreciate it if you inform me (tauyeung@ieee.org) and join the development team hosted by www.sourceforge.net.