Date: Sat, 12 Apr 1997 23:40:28 -0600 From: vanmaren@fast.cs.utah.edu (Kevin Van Maren) To: Bruce.Albrecht@seag.fingerhut.com, terry@lambert.org Cc: freebsd-smp@freebsd.org Subject: Re: Tyan ATX 1668 Message-ID: <199704130540.XAA15914@fast.cs.utah.edu>
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>> I've got one of these on order, and I understand that there's a >> problem with the 5th PCI slot, which is not currently a problem for me >> since I'm currently planning to use 3 slots. However, I was wondering >> if this problem is a hardware problem or a BIOS problem, and whether >> it matters which BIOS (AMI/Award) one is using. If it's BIOS, what's >> the change that Tyan will have the BIOS manufacturers fix it if we all >> complain? Only the Award BIOS is available from Tyan (If you can find the AMI, let me know; I'd really like to try it!). Award BIOS in general has a problem in that it supports at Most 1 PCI bridge, even w/o SMP. Tyan's Award BIOS also has the annoying feature in that on every soft-reboot it does the complete (slow) memory `test' (bad memory can `pass' and still cause a FreeBSD panic as soon as it boots). The BIOS also has the limitation mentioned in that only 4 entries are reserved for PCI cards, when the system has 5 slots. Also note that the BIOS has the number of processors `hard-wired' to 2. >The 5th slot shares the same interrupt map as the fourth slot, [...] I believe that the 5th slot shares with the First slot. If you put a card that doesn't use interrupts in it, you should be fine (ie, a video card). >The BIOS problem is that the mptable does not refect the correct number >of PCI busses on the motherboard (it says there is one and there are 2), >and so the second bus's APIC is incorrectly configured to an ISA >interrupt (you can get more information on this by searching the SMP >list archives on www.freebsd.org). No. They Tyan S1662/S1668 has only 1 (one) PCI bus. All 5 slots are on the same PCI bus. Of course, there are two PCI busses if you use an Adaptec 3940 or other device with a PCI-PCI bridge on it. But the particular problem referred to was the missing entry for the 5th slot. > Terry Lambert Kevin
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