Re: Atari TT (next)

Michael Schmitz
2012-01-08T23:42:25Z

Hi Geert,

>>> Being on the Zorro II bus (first 16 MiB), it's slow on most machines and doesn't
>>> support RMW cycles (needed for page tables) on Zorro III-capable machines.
>>> In general, we don't use Z2 RAM as system memory on Z3 capable machines.
>>
>> But is its physical address lower than the kernel segment's, as in this case?
>
> Yes, Zorro II space is the first 16 MiB.

Thanks, so there would be a similar situation where Z2 RAM would not
be accessible to mem_init on Amiga.

> But it's handled completely separately from system RAM.
> Its mapping is set up in mmu_init_amiga() in head.S.

Looks like we may need to do the same for the TT then.

Cheers,

Michael