Date: Mon, 24 May 1999 15:14:55 -0700 From: gil <gil@truepath.com> To: AIC7xxx@FreeBSD.ORG Subject: Re: How to change IRQ??? Message-ID: <3749CF5F14A.0FB6GIL@mail.truepath.com> In-Reply-To: <3742DB23.57AE9E21@redhat.com> References: <37428D24172.543AGIL@mail.truepath.com> <3742DB23.57AE9E21@redhat.com>
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Hi, I'm pretty confused about an IRQ conflict between an Adaptec 2940 that is built into the motherboard on my IBM 704 server and a raid controller card. Both are PCI cards and are vying for IRQ 11. Can I change the default IRQ by using some kind of append="aic7xxx=...." in lilo.conf? Or how about compiling the aic7xxx driver as a module and using insmod? I tried moving the raid controller card to another slot as was suggested below, but it still looks for IRQ 11. I would really appreciate some education on PCI's. I guess I'm just use to the old style cards that have jumper settings. Those seemed to be eaiser to figure out :-) Looking forward to your reply. I'm running Red Hat 5.2 (Linux 2.0.36). Gil > gil wrote: > > > > Hi, > > > > I am trying to install a back up system in an IBM 704 running Linux Red > > Hat 5.2. The IBM 704 has two built in Adaptec 2940's using the 7880 > > chipset. > > > > When I compile in the AIC7xxx driver and reboot, there is a conflict > > between the SCSI RAID controller card and the 2940. It appears that the > > 2940 is trying to take IRQ 11 which is also being used by the SCSI > > controller. > > > > How do I resolve this? How do I change the IRQ of the 2940? I checked > > the CMOS settings and I can enable and disable the two 2940's, but I > > see no way of assigning an IRQ. > > Since the 7880 chips are on the motherboard, their IRQ is likely hard > wired and can't be changed. In order to get the conflict resolved, you > need to try moving the RAID controller around to different PCI slots > until the RAID controller and the aic7xxx chips don't share an IRQ. If > that doesn't work, then it would be time to go in and fix the RAID > controller's driver to use shared interrupts (which the aic7xxx driver > already does, but the kernel requires both drivers to register their > IRQs as sharable before it will actually allow them to be shared). > > -- > Doug Ledford <dledford@redhat.com> > Opinions expressed are my own, but > they should be everybody's. > in His grip, Gil http://www.truepath.com your Christ-centered web host To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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