Date: Fri, 04 Apr 1997 14:55:52 -0700 From: Steve Passe <smp@csn.net> To: vanmaren@fast.cs.utah.edu (Kevin Van Maren) Cc: nishio@caleche.kecl.ntt.co.jp, freebsd-smp@freebsd.org Subject: Re: APIC_IO problem on Tyan S1668 Message-ID: <199704042155.OAA18505@Ilsa.StevesCafe.com> In-Reply-To: Your message of "Fri, 04 Apr 1997 13:23:54 MST." <199704042023.NAA20216@fast.cs.utah.edu>
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Hi, > Nope! There are two cards in the 5-PCI slot MotherBoard (NO bridge chips). > Note that they are both on PCI bus #0. The problem is that there are > 5 PCI slots, 4 PCI/ISA redirection registers, and 4 MP table entries. > Yes, it is a problem with the Tyan MB that it doesn't have all the PCI > slots in the table. I'll buy that. The PCI code is probably confused by a shared INT where one card is being handled via a lower INT and the other an upper APIC INT! The new gigabyte dual 686DX has five slots and its mptable looks like: INT active-lo level 0 8:A 2 16 INT active-lo level 0 9:A 2 17 INT active-lo level 0 10:A 2 18 INT active-lo level 0 11:A 2 19 INT active-lo level 0 7:A 2 19 INT active-lo level 0 12:A 2 16 why 6 entries I have no idea... this is with 2 PCI cards installed: ahc0 <Adaptec 2940 Ultra SCSI host adapter> rev 0 int a irq 16 on pci0:8:0 de0 <Digital 21140 Fast Ethernet> rev 17 int a irq 19 on pci0:11:0 --- I still believe it can be fixed with a bandaid in the kernel. This fix unfortunately will be SLOT specific, ie once installed in the kernel, the SMC card will have to stay in that specific slot to work. I think the correct long-term solution is going to be kernel code that rebuilds the mptable after PCI discovery has finished., ie we will toss the mptable provided by the MB. -- Steve Passe | powered by smp@csn.net | Symmetric MultiProcessor FreeBSD
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