| Re: [hatari-devel] New WinUAE core issue with Bad Mood? |
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On 6 Dec 2014 at 1:29, Nicolas Pomarède wrote:
> Le 06/12/2014 01:09, Roger Burrows a écrit :
> > On 6 Dec 2014 at 0:38, Nicolas Pomarède wrote:
> >> Le 04/12/2014 20:05, Eero Tamminen a écrit :
> >>> Some additional issues I noticed:
> >>>
> >>> - EmuTOS 512k doesn't boot up in TT or Falcon mode, it just endlessly
> >>> bus errors.
> >>
> >> regarding emutos, I think the problem is that if the cpu is 68030, then
> >> emutos expects the MMU to be available. I also get crashes if I don't
> >> select MMU when 68030 is selected.
> >> - 68020 without MMU -> emutos 0.93 OK
> >> - 68030 with MMU -> emutos 0.93 OK
> >> - 68030 without MMU -> emutos crashes
> >>
> > You're correct, the latest version of EmuTOS expects that a real 68030
> will
> > have the PMMU available. It sets up the PMMU tables just like TOS 3.06.
> > However, during startup, if the processor appears to be a 68030 but PMOVE
> from
> > TC gets an exception, EmuTOS will assume it's running on a 68ec030 which
> it
> > doesn't expect to have a PMMU.
> >
> thanks for the explanations.
>
> I need to check this, because so far 68030 without MMU will loop
> forever. This looks like an error in the cpu's core when it reaches
> e000b2, it seems prefetching is wrong and a wrong instruction gets
> executed, which creates an exception and a loop in the tos boot sequence..
>
Well, it could be an EmuTOS bug because I don't think that it's ever been run
on a real or emulated 68ec030. I'll look at the code around e000b2 and see
what exactly I think should happen.
Roger