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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] VME access
- From: Christian Zietz <czietz@xxxxxxx>
- Date: Sun, 3 Jan 2021 11:47:27 +0100
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Thorsten Otto schrieb:
On Sonntag, 3. Januar 2021 10:02:19 CET Thomas Huth wrote:
> Couldn't you please try to come
> up with enough VME emulation instead to fix Linux on the TT? That would
> be the better direction.
Wouldn't it make more sense to pretend no VME is available? To emulate
VME, you would need to specify which kind of VME card should be emulated
(AFAIK could be either memory expansion, or graphics-card, or network
card). That would be a pain.
Hm, think there's a misunderstanding here -- or rather: unclear
terminology. Eero's patch does not deal with emulating the VME bus per
se, but with configuring bus errors for *SCU* registers. The SCU (System
Control Unit?) is an ASIC in the TT and MegaSTE that -- among other
things -- takes care of interrupt routing, for the onboard interrupt
sources as well as for interrupts from the VME bus.
For sure, a proper emulation of the SCU (at least as far as interrupt
routing is concerned) should be the long-term goal for Atari, imho.
Regards
Christian
--
Christian Zietz - CHZ-Soft - czietz@xxxxxxx
WWW: https://www.chzsoft.de/
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