Re: [hatari-devel] Tests of Falcon games

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Would it be possible

Le 06/10/2020 à 00:48, Eero Tamminen a écrit :
Hi,

On 10/5/20 11:20 PM, Nicolas Pomarède wrote:
Le 04/10/2020 à 18:59, Eero Tamminen a écrit :
capy : not tested

Dies now to:
WARN : Bus Error reading at address $ff9c00, PC=$3dfe2 addr_e3=3dfe2 op_e3=4cd8

This is *regression* from Hatari v2.2.1.

(FF9C00 is just after normal VIDEL regs.)

Sokoban by FUN : game freeze (black screen) after Bus Error writing at address $ff97fe, PC=$e12bce addr_e3=e12bce op_e3=4ad5

same.

according to our test results for bus errors in falcon mode, we can see that we have different results depending on compatibility mode with ste (bit 5 at ff8007).

in falcon mode :
  $FF9C00 - $FFA200 : gives bus error
  $FF9224 - $FF9800 : gives bus error
  -> access to ff9c00 and ff97fe should give bus error

in compatible mode :
  $FF9000 - $FFA000 : no bus error
  -> access ff9c00 and ff97fe should not give bus error

So, are those games really supposed to run in plain falcon mode or should compatible mode be used ? I don't see why the games would access these 2 addresses that don't seem to be used for anything.

When tracing the compat bit:
b (0xff8007).b & 0x20 ! (0xff8007).b & 0x20 :trace

It seems to be set (= Falcon mode) at boot, before
TOS memory test.

Neither of these games clears that bit to STE bus
mode.


With current Hatari, Capy works if MMU is enabled [1], fails if MMU is disabled. With earlier Hatari
version, it worked regardless of whether MMU was
enabled or not.

(Which is confusing... Didn't the Falcon bus mode
work properly earlier?  If it now works correctly,
how this game ever worked on real Falcon them?)


Isn't it possible that the game remaps some falcon memory areas with the MMU to avoid the bus adressses ?

After all, we've done all our previous tests with MMU off, but as it improved a lot these months, I've decided to test with MMU = ON (as it is in the real Falcon).

Laurent





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