Date: Tue, 9 Jan 1996 20:11:10 -0800 (PST) From: Neil Bradley <root@synthcom.com> To: Terry Lambert <terry@lambert.org> Cc: "Amancio Hasty Jr." <hasty@rah.star-gate.com>, terry@lambert.org, freebsd-hackers@FreeBSD.org Subject: Re: PnP problem... Message-ID: <Pine.BSD.3.91.960109195925.13432A-100000@synthcom.com> In-Reply-To: <199601100247.TAA13642@phaeton.artisoft.com>
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On Tue, 9 Jan 1996, Terry Lambert wrote: [ I got lost as to who said what, so if it appears that the wrong person is being quoted here, no harm intended ] > > > > Grand Total: 4 Interrupts, 3 DMA Channels, 7 sets of I/O ports... > > > One would think you could share interrupts... then ask where it was > > > coming from. ISA Interrupts are not shareable - they're edge triggered. > It makese sense that you would have one interrupt per card so you don't > run out between card slots and onboard devices... it's stupid that the > GUS doesn't have an interupt multiplex on board. You'll have to live > with it until you buy a pure PCI system instead of a PCI bridged off > of ISA. I recommend the Apple and Motorolla chipsets. 8-). Too bad no one makes extensive lines of boards for PCI Apples. ;-) PCI Isn't "bridged off" of ISA. It's the other way around. If that were the case, then PCI couldn't run faster than ISA, now could it. ;-) Besides, this isn't a problem with Intel/Mortorola, it's a problem with the ISA bus, and if you recall correctly was implemented by IBM - not Intel. > Conclusion: If you have problems, it's because your GUS is too greedy. You are right about sound cards being entirely too greedy. The setup on the cards themselves is pretty horrid - causing the whole machine major grief if they're set up even slightly incorrectly. Back when I designed BIOSes for P5 motherboards, we'd initialize ISA devices first. We'd start by shutting off all on-board capabilities in case someone plugged in an off-board IDE, Serial, Video, etc... card. After it did that, we'd take the existing user's setup and set up on-board devices. Then EISA. Then, from the pool of I/O, memory, and interrupts, we'd allocate space for PCI devices. PCI Devices always went to the end of the heap, because, by PCI's definition, it was a requirement that they not be fixed in BIOS. -->Neil ------------------------------------------------------------------------------- Synthcom System's homepage: http://www.synthcom.com/ Europa Upgrade, Synth patches (D-50, Xpander/Matrix 12), used gear pricelist
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