Re: [hatari-devel] Microwire register value on Falcon

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Hi,

Thanks a lot too for the tests.

So, it seems that $ff8922 always return 0 and $ff8924 returns $7ff 
except the first time (a change, then the mask value).

I think it could be OK to just return $7ff, but a program may test if 
the value is different and then equal.
As I've never encountered this before, I think we can just return $7ff 
and add a comment in iomemtabfalcon for this $f800 value, for later if 
needed.

Thomas, instead of a return0 function, wouldn't it be better to have a 
returnFixValue (thevalue) one ?

we could do : returnFixValue(0) for $ff8922 and returnFixValue($7ff) for 
$ff8924

Regards

Laurent





01/02/2012 22:09, Thomas Huth a écrit :
> Am Wed, 1 Feb 2012 20:45:06 +0000
> schrieb "Konador, Cyprian"<cyprian.konador@xxxxxx>:
> [...]
> > Below you can find result in TXT
> >
> > CPU - Microwire Data read:
> > pass 1	pass 2	pass 3	pass 4
> > $0000	$0000	$0000	$0000
> > $0000	$0000	$0000	$0000
> > $0000	$0000	$0000	$0000
> > $0000	$0000	$0000	$0000
> > [...]
> >
> > CPU - Microwire Mask read:
> > pass 1	pass 2	pass 3	pass 4
> > $f800	$f800	$f800	$f800
> > $07ff	$07ff	$07ff	$07ff
> > $07ff	$07ff	$07ff	$07ff
> > $07ff	$07ff	$07ff	$07ff
> > [...]
> Ok, thanks a lot to everybody involved for the fast help here! I'm not
> quite sure how to interpret the $f800 in the mask register here
> (anybody got an idea why the Falcon would return the inverted value
> here?), but I think for the most programs, it should be enough to simply
> return the value that has been written to the register. What do you
> think?
>
>   Thomas