From owner-freebsd-smp Thu Nov 28 13:12:18 1996 Return-Path: owner-smp Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id NAA13470 for smp-outgoing; Thu, 28 Nov 1996 13:12:18 -0800 (PST) Received: from uruk.org (root@faustus.dev.com [198.145.95.253]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id NAA13465 for ; Thu, 28 Nov 1996 13:12:13 -0800 (PST) Received: from uruk.org [127.0.0.1] (erich) by uruk.org with esmtp (Exim 0.53 #1) id E0vTDop-0002oO-00; Thu, 28 Nov 1996 13:16:27 -0800 To: Steve Passe cc: Terje.N.Marthinussen@cc.uit.no, smp@freebsd.org Subject: XXPRESS bus In-reply-to: Your message of "Wed, 27 Nov 1996 14:02:34 MST." <199611272102.OAA16661@clem.systemsix.com> Date: Thu, 28 Nov 1996 13:16:27 -0800 From: Erich Boleyn Message-Id: Sender: owner-smp@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Steve Passe writes: > > >--- > > >> However then came: > > >> BIOS basemem (633K) != RTC basemem (640K), setting to BIOS value > > >> unknown bus type: 'XPRESS' > > >> > > >> Followed by panic... ... > > > > Well, I'm not really sure what the XPRESS bus is. I'm a bit new to these > > machines. I would suspect it to be the system bus? > > > > If so, I would suspect that the PCI busses and CPU cards are already on it? > > The only slots in it that is non pci/eisa are those that the CPU > > and memory cards are plugged into. > > the CPU/memory might be whats on the XXPRESS bus. > you have 2 PCI busses, as well as an EISA bus in addition to the XPRESS > bus: ... The XPRESS bus is basically the Pentium CPU/memory bus. There are many high-end (especially >2 CPU SMP) boxes with this bus explicitly supported to add expandability for RAM/CPU cards. The PCI and/or (E)ISA buses are bridged from the XPRESS bus. Note that although I've never seen a Pentium Pro that has it's CPU/memory bus explicitly listed in the MP Spec tables, they do all have a separate bus which the PCI and/or (E)ISA buses are bridged from. ...and yes, the Pentium Pro CPU/memory bus is totally different from the XPRESS bus. Actually, the (E)ISA bus is usually bridged from the PCI bus on the high-end boxes. -- Erich Stefan Boleyn \_ E-mail (preferred): Mad Genius wanna-be, CyberMuffin \__ (finger me for other stats) Web: http://www.uruk.org/~erich/ Motto: "I'll live forever or die trying"