Date: Tue, 26 Sep 2000 05:00:39 -0500 (CDT) From: Mike Meyer <mwm@mired.org> To: Mike Ruhl <mruhl@cips.nokia.com> Cc: questions@freebsd.org Subject: Re: sound vs. scsi Message-ID: <14800.29639.637521.742184@guru.mired.org> In-Reply-To: <55037608@toto.iv>
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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: <AudioPCI ES1371> port 0x1000-0x103f irq 11 at device 15.0 on > pci0 > > ahc0: <Adaptec 2940 Ultra SCSI adapter> 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. <mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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