Re: [PATCH 0/4] Atari kernel-in-FastRAM patches, take three

Finn Thain
2014-04-09T06:45:04Z

On Fri, 4 Apr 2014, I wrote:

> On Wed, 2 Apr 2014, Michael Schmitz wrote:
>
> > > It may be possible to boot Linux with MacOS running in 24-bit mode,
> > > and ISTR that this leads to a large number of memory chunks.
> >
> > The chunk size would still be 16 MB, perhaps?
>
> Looking at the Penguin source, findRAM() in Source/mmu_support.c sorts
> the boot info memory mappings so that the largest chunk comes first. In
> 32-bit mode, it will probably be the only chunk.

... but not always: Designing Cards & Drivers 3ed. p.28 says, "In the
Macintosh IIci and the Macintosh IIsi, physical memory is not in one
contiguous block, so the MMU of the 68030 joins the blocks of physical
memory to present contiguous logical memory to application software."

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