Re: [hatari-devel] Data cache Issues?

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 04/06/2015 21:39, Eero Tamminen a écrit :

> With this change, B-o-R game and Yepyha & Firestarter demos work.
>
> Whether issues are bug(s) in emulation or just related to timings
> changing slightly with data caches, I don't know.  At least
> none of these programs needs DSP, so it shouldn't be related to
> CPU<->DSP timings.

Hi

I think this is now fixed ; although loading data directly in RAM for 
gemdos HD emulation was very likely to cause a mismatch between current 
cache and new RAM content, which required to flush the data cache, 
writing directly to RAM could also cause mismatches between instruction 
cache and real program (that's less likely but still possible, which is 
why the crash were random)

In that case, as instruction cache was not flushed it could contain code 
dating before writing to RAM, so we would execute some wrong 680xx 
program because we prefetch some old 16 bit words.

I changed this to clear both data and instruction caches and I can now 
run Virtual City in prefetch/compatible or CE modes (those 2 modes make 
use of the instruction cache)

Please test again with Beats Of Rage and your other demos, it should 
hopefully work better.

Nicolas