| Re: [hatari-devel] SCU/VME register access? |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] SCU/VME register access?
- From: Christian Zietz <czietz@xxxxxxx>
- Date: Wed, 8 Apr 2020 21:01:14 +0200
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Eero Tamminen schrieb:
>> MFP & SCC interrupts are enabled in VME mask:
>> https://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k.git/tree/arch/m68k/atari/ataints.c#n303
On real hardware, this is indeed important. Even interrupts *not*
originating from the VME bus are routed through the SCU. If you mask
them there, they're not registered by the system anymore. See this issue
we had a long time ago in EmuTOS where SCC drivers would not see any SCC
interrupts because EmuTOS didn't enable them in the SCU:
https://sourceforge.net/p/emutos/mailman/message/36421899/
Whether it's worth emulating that masking in Hatari, I don't know.
Regards
Christian
--
Christian Zietz - CHZ-Soft - czietz@xxxxxxx
WWW: https://www.chzsoft.de/
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