Date: Thu, 26 Jun 1997 18:07:09 -0700 From: David Greenman <dg@root.com> To: Jon Inouye <jinouye@cse.ogi.edu> Cc: "Jordan K. Hubbard" <jkh@time.cdrom.com>, freebsd-hardware@FreeBSD.ORG Subject: Re: IRQ assignment for PII motherboards Message-ID: <199706270107.SAA10980@implode.root.com> In-Reply-To: Your message of "Thu, 26 Jun 1997 17:12:45 PDT." <Pine.HPP.3.95.970626170217.4996F-100000@indurain.cse.ogi.edu>
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>However, sharing an IRQ between an Intel EtherExpress 10/100 and an >Adaptec 3940W is _not_ performance friendly - I expect timeout errors for >FreeBSD and see them occasionally on WindowsNT. You would think that >given some free IRQs (by disabling the serial, parallel, and USB ports) >the BIOS would set up a one-to-one mapping between PCI interrupts and ISA >IRQs. Unfortunately, it doesn't seem to want to and there appears to be >no hook to manually configure things. Oh, well, I sent off email to our >Intel sponsors and hope to get utility software from them - or a BIOS >upgrade. (Or perhaps even a RTFM on page xxx! ;-) I was able to get the Pro/100B, in a system with a pair of ahc3940's, to get assigned to a non-shared interrupt by playing around with which slots the cards were plugged into. It took about 3 tries to find the right order (including leaving a slot empty), but I finally found an arrangement that worked. My understanding is that the shared irq assignment isn't a function of the BIOS, but rather a function of the slot the card is in and how it is wired compared to the others. The motherboard I did this in wasn't made by Intel, but the same principles should still apply. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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