From owner-freebsd-hardware Thu Jun 26 18:06:10 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id SAA24570 for hardware-outgoing; Thu, 26 Jun 1997 18:06:10 -0700 (PDT) Received: from implode.root.com (implode.root.com [198.145.90.17]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id SAA24563 for ; Thu, 26 Jun 1997 18:06:05 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by implode.root.com (8.8.5/8.8.5) with SMTP id SAA10980; Thu, 26 Jun 1997 18:07:09 -0700 (PDT) Message-Id: <199706270107.SAA10980@implode.root.com> X-Authentication-Warning: implode.root.com: localhost [127.0.0.1] didn't use HELO protocol To: Jon Inouye cc: "Jordan K. Hubbard" , freebsd-hardware@FreeBSD.ORG Subject: Re: IRQ assignment for PII motherboards In-reply-to: Your message of "Thu, 26 Jun 1997 17:12:45 PDT." From: David Greenman Reply-To: dg@root.com Date: Thu, 26 Jun 1997 18:07:09 -0700 Sender: owner-hardware@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk >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