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

["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.

Roger Burrows