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Author Topic: UAE w/mmu patch...any success compiling?  (Read 2862 times)

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Offline Cymric

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Re: UAE w/mmu patch...any success compiling?
« on: August 02, 2004, 02:30:52 PM »
I dimly recall that a major difference between the 68040 and 68030 MMU is that the 68040 can only handle two page sizes (4 and 8 KB), while the 68030 is much more versatile with around eight or ten. The instruction set to handle the MMU is, from what I remember, more or less the same. Someone with better memory and access to Motorola reference manuals can probably explain things a lot better.
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Offline Cymric

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Re: UAE w/mmu patch...any success compiling?
« Reply #1 on: August 02, 2004, 11:01:41 PM »
Quote
Piru wrote:
Unfortunately not so. 68030 and 68040 use different supervisor instructions to access registers, (some) different supervisor registers and the register bit mappings are different, as well as page descriptors.

Ick. MMUs were never my strong point, I simply didn't understand what they were doing. And when I did, I knew I didn't want to get involved with them too much. Thanks for the info.
Some people say that cats are sneaky, evil and cruel. True, and they have many other fine qualities as well.