Re: MMU questions?

From: Doug Little <doug_at_innerworkings.co.uk>
Date: Mon, 8 Jun 1998 11:28:41 +0100

>I think the original message was about implementing 040 PMMU support in
MiNT
>for memory protection and virtual memory. So if someone did, it would be
>a good idea to make it replace the TK as well, atleast the part of the TK
>which deals with the PMMU?


If MiNT gets PMMU support, then I would strongly suggest that users get rid
of the
TK driver completely - except when they boot under TOS.

I could solve all of these problems very easily by marking the entire STRam
block
as non-cacheable, leaving the FastRAM cacheable - but under TOS that would
be
slow because it keeps the stacks and other commonly used things in STRam and
it would probably hit performance a lot.

I tried moving the stacks into FastRAM, but TOS is so badly written that it
keeps
resetting the stacks back into STRam at hardwired locations. It's very bad.
I gave
up eventually.

Doug.
Received on ma. juni 08 1998 - 18:35:00 CEST