Date: Fri, 17 Jan 1997 23:59:41 -0500 (EST) From: Kenneth Merry <ken@housing1.stucen.gatech.edu> To: cbrown@aracnet.com Cc: smp@freebsd.org Subject: Re: Adaptec 3940UW and SMP Message-ID: <199701180459.XAA06284@housing1.stucen.gatech.edu> In-Reply-To: <32E04E41.5D04@aracnet.com> from Chris Browning at "Jan 17, 97 08:14:57 pm"
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Chris Browning wrote... > > There are only four IRQ's for 5 slots. Slots 4 and 5 share the > > same IRQ. So in order to have cards in both 4 and 5, I would assume that > > the cards would have to be able to share interrupts, or one of the cards > > would just not use an interrupt. (like a video card, perhaps) This is the > > setup I have now, it seems to work fine: > > > > Slot 1: Adaptec 3940UW (IRQ 11) > > Slot 2: Matrox Millenium (IRQ 10) > > Slot 3: Empty (IRQ 9) > > Slot 4: SMC 10/100 card (IRQ 15) > > Slot 5: Empty (shares IRQ w/ slot 4) > > > > The second channel of the 3940 grabs IRQ 10, and video still works > > fine. > Why not place the 3940UW in slot 4. That way, it will share an > interrupt with the other > channel of the 3940UW. It should be given that this card can share an > interrupt with itself. > I believe I have used this card in this configuration. Then you could > also move the Millenium to > Slot 5 and still have two empty, USABLE, PCI slots. I am pretty sure > that the Millenium doesn't > use any interrupt (as most video cards don't), so this should be a safe > configuration. Hmm, yeah, that might well work. It's working fine as-is, though. I'll probably get around to testing things with at least 4 slots full before too long, though. > Personally, I can't believe that they would design a MB with hardwired > interrupts. You should be > able to have a PCI slot without ANY interrupt assigned. In addition, > they all use INTA? That is > kinda a waste. Sounds like that kinda kludged the interrupt mapping > into the system. Well, actually, I hardwired the interrupts (11, 10, 9, etc.) in the BIOS. Normally they are automatically assigned, I just did them myself so I would know which interrupt was getting assigned to which slot. I could probably go back to automatic assignment without any problems. All of the slots do use INTA, though. (the manual is fairly clear on that) Ken -- Kenneth Merry ken@ulc199.residence.gatech.edu Disclaimer: I don't speak for GTRI, GT, or Elvis.
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