I didn't notice Coldfire had already been mentioned - I guess I'll just blame bad eyesight or the fact it was getting late or something lame. I think more coffee is in order...!
There are code differences between 68000, 68020/030 and 68040 strains inside the 680x0 family that stop code written for one running on the others, but it's not caused any issues in Mac OS because the OS was programmed or amended to run on the later 68k chips.
I see no reason why the same would not apply to CF68k chips, given the correct intermediary, possibly on the form of a FPGA, between the computer and the CF68k chip. It'd not be ideal but the commands that are mentioned in the FAQ are well documented so they could be trapped and redirected or re-coded to legal routines if you had an experienced programmer on the case. Either that or you need a pre-boot patch ROM that loads the necessary patches to 'patch' the Mac OS ROM. Daystar's Turbo cards do this, so it's possible.
IMHO that would be required to use either a 68060 or a Coldfire as both vary slightly from earlier models and there's no way to patch the OS at a low enough level as to sort it out before code execution takes place, short of loading it from ROM at power-on otherwise.
Of course this is all pretty moot as it's never going to happen, but it makes for interesting speculation
There are code differences between 68000, 68020/030 and 68040 strains inside the 680x0 family that stop code written for one running on the others, but it's not caused any issues in Mac OS because the OS was programmed or amended to run on the later 68k chips.
I see no reason why the same would not apply to CF68k chips, given the correct intermediary, possibly on the form of a FPGA, between the computer and the CF68k chip. It'd not be ideal but the commands that are mentioned in the FAQ are well documented so they could be trapped and redirected or re-coded to legal routines if you had an experienced programmer on the case. Either that or you need a pre-boot patch ROM that loads the necessary patches to 'patch' the Mac OS ROM. Daystar's Turbo cards do this, so it's possible.
IMHO that would be required to use either a 68060 or a Coldfire as both vary slightly from earlier models and there's no way to patch the OS at a low enough level as to sort it out before code execution takes place, short of loading it from ROM at power-on otherwise.
Of course this is all pretty moot as it's never going to happen, but it makes for interesting speculation