Re: [hatari-devel] little problem with 060 CPU and prefetch or cycle exact modes

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Hi Thomas,

I'm using the current dev version.

I got it when I select 060  + prefetch or cycle exact modes.

My params :

System :
Falcon
Wakestate3
Dsp : full

Blitter in st mode ON
Patch timerD off
Boot faster : off


CPU :
68060
clock : 32 Mhz (also 16 Mhz doesn't change anything to the problem)
Fpu : I've got the problem with both none, internal or 68882
Cpu parameters :

prefetch mode : on (does the problem)
cycle exact : on (does the problem too)
MMU disabled
24 bits enabled (or disabled doesn't change anything)


TOS 4.04 FR

14 Mb RAM


Yesterday evening, I changed parameters one by one to try to figure out 
which one does the problem.
It seems that 68060 + prefetch mode or cycle exact is the bad combo.

Regard
Laurent




Le 08/07/2017 à 10:12, Thomas Huth a écrit :
> Am Thu, 6 Jul 2017 10:42:54 +0200
> schrieb Nicolas Pomarède <npomarede@xxxxxxxxxxxx>:
>
> > Le 05/07/2017 à 23:45, Laurent Sallafranque a écrit :
> > > Hi all,
> > >
> > > I've got a problem with the 060 CPU :
> > >
> > > If I run hatari with 060 CPU and prefetch mode AND cycle exact
> > > unchecked, hatari runs well.
> > >
> > > But If I check (activate) either "prefetch mode" or "cycle exact",
> > > the desktop displays very very slowly.
> > >
> > > Is it a bug in hatari ?
> I can not reproduce that problem. What are your other CPU settings?
> CPU frequency, MMU, ...? Which TOS version are you using?
>
> Also, I assume you're using the mercurial tip? Or are you referring to
> the 2.0 release version?
>
> > For now, don't use prefetch or cycle exact for 68060, even it didn't
> > slow down Hatari, you wouldn't see any better results anyway (there's
> > no cycle exact mode for 68060).
> Yes, agreed, but we should try to fix that slow-down anyway to prevent
> that other users accidentially end up in this situation, too.
>
>   Thomas