Re: [hatari-devel] TOS bootup tester results

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

What if in WinUAE core we default to 32-bit addressing on TT,
as with that RAM detection seems to work in all cases?

Do you think that would cause issues somewhere else?


	- Eero

On perjantai 26 kesäkuu 2015, Nicolas Pomarède wrote:
> Le 26/06/2015 00:55, Eero Tamminen a écrit :
> > Enabling MMU doesn't help, but enabling 32-bit addressing makes TOS v3
> > work also with 4MB of RAM.  I.e. it was actually 32-bit addressing,
> > not TT-RAM, that helped.
> > 
> > Why things work without 32-bit addressing when there's >4MB of ST-RAM?
> 
> Hi
> 
> memory above 4 MB was not a standard MMU confirguration. In that case, a
> patched version of the TOS is needed (or some programs in auto/ that
> will reconfigure the TOS memory map).
> In Hatari, we force a few system variables in stMemory.c to skip the
> hardware ram detection. When we skip the ram detection, I guess we also
> skip some parts of the boot process that requires 32 bit and that once
> the ram detection is done (or skipped), TOS doesn't try to access 32 bit
> address, only the ram that was declared in TOS.
> 
> Nicolas