Because of his refusal to produce a compatible fpu and mmu. He has repeatedly said that it won't have a compatible one. Even the disabled fpu doesn't produce the same results as a real fpu, because of his design.
This is just wrong. The publically not available FPU is fully 040 compatible. May be you are a little confused about the compatibility among the different Motorola FPUs? The FPU in the 080 can even reach 882-compatibility level with some microcode.
It's simple. He is only wasting scarce resources on developing SAGA because he can't use code from minimig/replay because he's keeping apollo closed source for his intended commercial use.
This is wrong for several two reasons but let me tell you the most obvious: he has an agreement with Thomas Hirsch of Natami fame to have access to the Natami AGA implementation. No license problems at all. However, he has decided to code the chipset himself because he thinks it will be easier to incorporate it into the design and to expand it to become SAGA if he writes the code himself. This in addition to the fact that he already had his own untested AGA-implementation to build on.
I know you want to believe the best in him
I don't believe in him, I have been working with him. I have his VHDL-code on my harddisk.
I don't think he'll succeed in the embedded market and it would be nicer if he'd focus on compatibility first.
There is no either-or question. If you pay him, he will make a ColdFire-derivative of his core for you. That doesn't mean the 080 as seen in the Vampire were ColdFire-compatible (and thus partly 68k-incompatible). There is an 80 bit FPU but it is obviously much slower than a 64 bit FPU, even more so if you use 64 bit FPU macros available in more recent FPGAs.
Apollo core in minimig on replay would be awesome, if we had the code then we could make changes where we don't like his decisions.
Yes, and you could save the cost for a M.D. by doing open heart surgery yourself, get yourself a knife. You have NO idea how complex the core is. The entire idea of doing changes to the core yourself is ludicrous. Just the instruction decoder of the 080 is FAR more complex than the ENTIRE open-source 68k cores available (which, btw, have no FPU or MMU AT ALL, are quite buggy, have only partial 020 support at best and thus are far less compatible than the 080 could ever be). I am a microchip developer by profession, I know VHDL. There is no chance in hell I could do architectural changes to Gunnar's core.