From owner-freebsd-questions Tue Sep 26 3: 1:20 2000 Delivered-To: freebsd-questions@freebsd.org Received: from guru.mired.org (zoom0-020.telepath.com [216.14.0.20]) by hub.freebsd.org (Postfix) with SMTP id 8494637B424 for ; Tue, 26 Sep 2000 03:01:17 -0700 (PDT) Received: (qmail 83144 invoked by uid 100); 26 Sep 2000 10:00:39 -0000 From: Mike Meyer MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14800.29639.637521.742184@guru.mired.org> Date: Tue, 26 Sep 2000 05:00:39 -0500 (CDT) To: Mike Ruhl Cc: questions@freebsd.org Subject: Re: sound vs. scsi In-Reply-To: <55037608@toto.iv> X-Mailer: VM 6.72 under 21.1 (patch 10) "Capitol Reef" XEmacs Lucid X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`;h9L,Yg`+vb1>RG% *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\ Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Mike Ruhl writes: > I recently added an Adaptec SCSI card (Adaptec 2940 Ultra SCSI > adapter) to my system. Since then I can no longer run anything that > accesses the sound card (AudioPCI ES1371) without winning a Fatal Trap > 12. > > A friend of mine suggested that the SCSI card and the sound card may > be trying to access the same DMA channel. However, I am not sure how > figure out which DMA channel is being used for either device. > > Can anybody tell me if this theory holds any water? And if so, do you > know how I can modify things to make this work again? If by "DMA channel" he means IRQ, then that's certainly something to check. > dmesg output: > > pcm0: port 0x1000-0x103f irq 11 at device 15.0 on > pci0 > > ahc0: port 0x1400-0x14ff mem > 0x48000000-0x48000fff irq 11 at device 13.0 on pci0 > ahc0: aic7880 Single Channel A, SCSI Id=7, 16/255 SCBs Note that they're both at irq 11. I would say that's almost certainly the problem, except my ahc7890 & AudioPCI 1370 work fine that way. However, try changing it and see what happens. You should be able to use your BIOS to force one of them to a fixed IRQ other than 11. Exactly what to use depends on the rest of your system.