MMU/JIT toggle on native mode

jotd · 14 September 2009, 21:36

Toni,

The coolest option ever would be: use MMU when in native mode and no JIT (PAL/NTSC) and JIT (and no MMU) when in Picasso/RTG board mode =>

1) perfect memory model to run whdload games and debug them
2) fastest development machine ever

whatcha think?

Toni Wilen · 15 September 2009, 11:56

I don't like these kinds of automatic configuration changes because there is always some situation that works badly, and then it needs to be disabled..

For example, it isn't good idea to get insta-crash if RAM suddenly disappears because MMU isn't translating it anymore..

Better to use either uae-configuration or directly use "uae boot rom hooks" (there is also uae.resource in recent versions, I can send example code)

jotd · 15 September 2009, 21:18

ok Toni, I'd like some example code about this.

Toni Wilen · 18 September 2009, 20:36

uae-configuration.s in amiga programs/sources.zip (comes with winuae archive) should be good starting point.

(just ignore old style absolute address 0xf0xxxx stuff, better only use uae.resource method)

I am not yet sure how to "officially" support MMU on/off but I guess something like

"mmu_model 0" (disable MMU)
"cachesize 8192" (enable JIT)

"cachesize 0" (disable JIT)
"mmu_model 68040" (enable MMU)

should work.

Of course you shouldn't do this if CPU is not 68040

14 September 2009, 21:36	#1
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,161	MMU/JIT toggle on native mode Toni, The coolest option ever would be: use MMU when in native mode and no JIT (PAL/NTSC) and JIT (and no MMU) when in Picasso/RTG board mode => 1) perfect memory model to run whdload games and debug them 2) fastest development machine ever whatcha think?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Native mode scanlines grey, not black...	mingle	support.WinUAE	1	05 February 2012 02:02
Is it possible to have scanlines enabled in native mode but disabled in RTG?	Dr.Venom	support.WinUAE	4	22 May 2011 10:04
WinUAE crashes when switching from MMU to JIT	jotd	support.WinUAE	1	19 November 2010 21:34
WinUAE 2.01 screen mode problem (native vs. RTG)	StingRay	support.WinUAE	13	28 January 2010 14:23
Unstable display in Native mode.	Ed Cruse	support.WinUAE	8	09 June 2009 16:08

15 September 2009, 11:56	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	I don't like these kinds of automatic configuration changes because there is always some situation that works badly, and then it needs to be disabled.. For example, it isn't good idea to get insta-crash if RAM suddenly disappears because MMU isn't translating it anymore.. Better to use either uae-configuration or directly use "uae boot rom hooks" (there is also uae.resource in recent versions, I can send example code)

15 September 2009, 21:18	#3
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,161	ok Toni, I'd like some example code about this.

18 September 2009, 20:36	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	uae-configuration.s in amiga programs/sources.zip (comes with winuae archive) should be good starting point. (just ignore old style absolute address 0xf0xxxx stuff, better only use uae.resource method) I am not yet sure how to "officially" support MMU on/off but I guess something like "mmu_model 0" (disable MMU) "cachesize 8192" (enable JIT) "cachesize 0" (disable JIT) "mmu_model 68040" (enable MMU) should work. Of course you shouldn't do this if CPU is not 68040

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)