Date: Tue, 12 May 1998 05:12:58 -0700 From: David Greenman <dg@root.com> To: Stephen Roome <steve@visint.co.uk> Cc: Terry Lambert <tlambert@primenet.com>, freebsd-current@FreeBSD.ORG Subject: Re: Intel Etherexpress PRO/100+ PCI Message-ID: <199805121212.FAA23850@implode.root.com> In-Reply-To: Your message of "Tue, 12 May 1998 11:56:49 BST." <Pine.BSF.3.96.980512102848.18433C-100000@dylan.visint.co.uk>
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>On Mon, 11 May 1998, Terry Lambert wrote: >% I find it unlikely that they are both on INT a. This may be a bug in >% the probe routines, or in your motherboard BIOS. It could also account >% for the start IRQ (say one was on 'INT b', but it wasn't seen). > >I think this is possibly probe related, although I can't be sure, but I've >just checked another six machines none of which use are probed as using >anything but int A. Terry just doesn't understand how interrupts work on the PCI bus, despite providing a nice picture. :-) All of the PCI cards with a single interrupt will use INT A - that's just how it works and is the reason for the interrupts being cascaded the way they are on the bus. INT A on one slot is not the same interrupt on another. >Which is really unlikely! Especially machines like this: > >chip1 <Intel 82371SB PCI-ISA bridge> rev 1 on pci0:7:0 > I/O Recovery Timing: 8-bit 3 clocks, 16-bit 2 clocks > Extended BIOS: enabled > Lower BIOS: enabled > Coprocessor IRQ13: enabled > Mouse IRQ12: disabled > Interrupt Routing: A: disabled, B: IRQ11, C: IRQ10, D: IRQ9 > ^^^^^^^^^ > MB0: IRQ15, MB1: >chip2 <Intel 82371SB IDE interface> rev 0 on pci0:7:1 > mapreg[20] type=1 addr=0000f000 size=0010. > Primary IDE: enabled > Secondary IDE: enabled >de0 <Digital 21140A Fast Ethernet> rev 32 int a irq 11 on pci0:10 > ^^^^^^^^^^^^ >That looks wrong to me, shouldn't that de0 be on int b ? >(I've got more machines that tell me this as well.) No. INT A on one slot is another's INT B. >I moved everything around as you suggest, but everything always comes up >as int A in the card probe, if what you say is true then it looks like >it's got to be the probe code, in more than one version. That's not your goal. You want them to each use a different _irq_ not a different INT letter. ...but none of this matters because it's not what is causing your problem. :-) -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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