Re: [hatari-devel] Mega ST(E)

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 13/06/2016 à 07:43, Thomas Huth a écrit :
> On 12.06.2016 20:31, Nicolas Pomarède wrote:
> ...
> > On a side note, I see that in the code you added in ioMem.c for
> > STF/MegaSTF, fix functions are called before filling the whole IO space.
> > This results in these kinds of warning :
> >
> > IoMem_Init: Warning: $ff820a (R) already defined
> > IoMem_Init: Warning: $ff820a (W) already defined
>
> Oh well, yet another stupid copy-n-paste error of mine... sorry! I just
> committed a fix.
>
> > It's harmless, but maybe we could fill default IO space first, then
> > apply fixes for each machine ?
>
> I'd like to keep the current order since that way you are informed about
> bugs (like above) ;-)

Hi

looking at the code when RTC is disabled for STF/STE, I see this in 
ioMem.c :

               for (addr = 0xfffc21; addr <= 0xfffc3f; addr++)
                {
                        pInterceptReadTable[addr - 0xff8000] = 
IoMem_VoidRead;     /* For 'read' */
                        pInterceptWriteTable[addr - 0xff8000] = 
IoMem_VoidWrite;   /* and 'write' */
		}

But in the TOS detection code, there's :

$00fc1f72 : 307c fc20                          movea.w   #$fc20,a0
$00fc1f76 : 2429 0008                          move.l    8(a1),d2
$00fc1f7a : 244f                               movea.l   sp,a2
$00fc1f7c : 237c 00fc 1fb6 0008                move.l    #$fc1fb6,8(a1)
$00fc1f84 : 117c 0009 001b                     move.b    #9,$1b(a0)

So I think TOS expects a bus error when RTC is not present and we try to 
read fffc29, but here bus error won't happen. Or is there something else ?

Nicolas