Re: [hatari-devel] Re:Microwire register value on Falcon |
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Hi,
I think it needs a few more tests here (especially for $ff8924).
For $ff8922, does it still read 0 after a write of a value != 0 in the register ?
I mean does it still read 0 after a MOVE.B #$A5,$FF8922.B (or any value you want instead of $A5).
For $FF8924, according to what I saw in team.prg (a soccer game that is supposed to run on STE and Falcon),
the program loops forever into :
$0397bc : 31fc 07ff 8924 move.w #$7ff,$ffff8924.w
$0397c2 : 0c78 07ff 8924 cmpi.w #$7ff,$ffff8924.w
$0397c8 : 66f2 bne.s $397bc
I bypassed this by removing the microwire from the ioMemTabFalcon.c, but that's obviously not the good way to fix this (it was just for the test).
Again I would like to be sure that writing a value to $ff8924 should return this value instead of 0.
Could you do these 2 tests please ?
Regards
Laurent
----- Mail Original -----
De: "Thomas Huth" <th.huth@xxxxxx>
À: hatari-devel@xxxxxxxxxxxxxxxxxxx
Envoyé: Mardi 31 Janvier 2012 22h34:32 GMT +01:00 Amsterdam / Berlin / Berne / Rome / Stockholm / Vienne
Objet: Re: [hatari-devel] Re:Microwire register value on Falcon
Am Tue, 31 Jan 2012 13:37:05 -0500
schrieb "Roger Burrows" <rfburrows@xxxxxxxxx>:
> On 30 Jan 2012 at 21:04, Thomas Huth wrote:
> >
> > Can somebody check what you get when reading $ff8922 on a real
> > Falcon? Looking at this piece of code, I'd guess that $ff8922 is
> > hard-wired to zero on the Falcon...
> >
> >
> > > Thomas, should we remove the microwire addresses from the
> > > IoMemTabFalcon.c as I did (There's really no microwire in the
> > > Falcon) ? I know you did a lot of tests on the bus errors.
> > >
> > > Actually, it looks like :
> > > // { 0xff8922, SIZE_WORD, IoMem_VoidRead, IoMem_VoidWrite
> > > }, /* Microwire data */
> > > // { 0xff8924, SIZE_WORD, IoMem_VoidRead, IoMem_VoidWrite
> > > }, /* Microwire mask */
> >
> > According to the bus error tester (see
> > tests/buserror/results/fal_n_w.txt), the Falcon does not generate a
> > bus error here, so you should not remove these entries. I'd rather
> > guess that the Falcon always returns 0 when reading the ff8922
> > register...
> >
> That's correct, I just tested on my Falcon. It doesn't bus error (in
> supervisor state :-), and it returns zero.
Great, thanks for the test, Roger, I've fixed Hatari now accordingly.
Thomas