Date: Fri, 4 Dec 1998 10:21:00 -0700 (MST) From: Kevin Van Maren <vanmaren@fast.cs.utah.edu> To: FreeBSD-gnats-submit@FreeBSD.ORG, freebsd-bugs@FreeBSD.ORG Subject: Re: kern/8928: 450NX-based computers only probe the first PCI bus Message-ID: <199812041721.KAA14050@fast.cs.utah.edu>
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Just a couple of things: The 2.2-STABLE patches have been tested (on an IBM 7000 M10), and they do work. The IBM allocates a PCI bus for every expansion slot in the system, in addition to the 3 busses (0-16 are "used"). The Dell PowerEdge 6300 also sets up the MIOC registers "wrong". However, the Dell just programs the "highest used bus number" to 255 on the last PXB. So the PCI code probes all 256 possible busses... So if (subordinatebus == 255), it should probably be set to (NBUS-2) for SMP, and presumably something "reasonable" otherwise. I can't tell how many "primary" PCI busses there are in the computer, but (because of the IBM 7000) that doesn't help much. I can read the lowest PCI bus number per PXB, but there is no easy way to infer the highest buds number. Perhaps we should just read the device id for every device on every PCI bus and program the subordinatebus to the highest bus number on which we found something. Yuck. Why is the BIOS on every 450NX-based Xeon screwed up? The intel bios didn't even bother to config the bus if it thought it was empty. Kevin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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