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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!newshost.telstra.net!act.news.telstra.net!psgrain!rainrgnews0!stargate.lbcc.cc.or.us!newsfeed.orst.edu!news.orst.edu!news.cvo.oneworld.com!news.pdx.oneworld.com!uunet!in2.uu.net!news.mathworks.com!zombie.ncsc.mil!cs.umd.edu!not-for-mail From: torek@elf.bsdi.com (Chris Torek) Newsgroups: comp.unix.bsd.bsdi.misc Subject: Re: multiple pci cards [shared IRQs] Date: 12 Mar 1996 03:16:01 -0800 Organization: Berkeley Software Design, Inc. Lines: 27 Message-ID: <4i3mdh$ab4@elf.bsdi.com> References: <313E5821.6D78@execpc.com> <4i0002$qg@raid.us.dell.com> <3144A92A.31FC@execpc.com> <1996Mar11.202048.1@spcvxb.spc.edu> Reply-To: torek@bsdi.com NNTP-Posting-Host: elf.bsdi.com In article <1996Mar11.202048.1@spcvxb.spc.edu> Terry Kennedy, Operations Mgr. <terry@spcvxb.spc.edu> writes: > I've had no problem using multiple PCI cards that share an interrupt, >although in my case it's been multiple identical cards. BSDI added this >support during the 2.0 (yes, 2.0, not 2.1) beta test period. Indeed, 2.0 and 2.1 do handle IRQ sharing on those cards that support it. The 2.1 release does a somewhat better job in that it knows that certain cards `definitely do' support sharing and omits the warning message excerpted below in that case. (Clearly it needs another special case here :-) .) Not all *cards* support sharing, and it is even possible that some PCI motherboard/BIOS/card combinations require the use of edge-triggered interrupts, which are not easily shared (ask your local hardware expert about edge vs. level triggering, and open-collector wire-OR circuits, if you really want to know). [this configuration ...] >BSDI BSD/OS 2.1 Kernel #0: Fri Jan 12 15:01:30 MST 1996 >bha0 at isa0 iobase 0x330 irq 9: Buslogic EISA/PCI/VLB rev 42 (32-bit) >WARNING: conflict at irq 9 >bha1 at isa0 iobase 0x334 irq 9: Buslogic EISA/PCI/VLB rev 42 (32-bit) [... works for several people.] -- In-Real-Life: Chris Torek, Berkeley Software Design Inc El Cerrito, CA Domain: torek@bsdi.com +1 510 234 3167