Date: Thu, 28 Nov 1996 13:16:27 -0800 From: Erich Boleyn <erich@uruk.org> To: Steve Passe <smp@csn.net> Cc: Terje.N.Marthinussen@cc.uit.no, smp@freebsd.org Subject: XXPRESS bus Message-ID: <E0vTDop-0002oO-00@uruk.org> In-Reply-To: Your message of "Wed, 27 Nov 1996 14:02:34 MST." <199611272102.OAA16661@clem.systemsix.com>
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Steve Passe <smp@csn.net> 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): <erich@uruk.org> Mad Genius wanna-be, CyberMuffin \__ (finger me for other stats) Web: http://www.uruk.org/~erich/ Motto: "I'll live forever or die trying"
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