Date: Mon, 24 Jun 2002 11:04:53 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: "M. Warner Losh" <imp@village.org>, ticso@cicely.de, alpha@FreeBSD.ORG Subject: Re: Wither the nexus driver? Message-ID: <Pine.BSF.4.21.0206241101160.94821-100000@beppo> In-Reply-To: <15638.39243.635286.767878@grasshopper.cs.duke.edu>
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note that on 8X00 and 4100 systems that the PCI chipset is *not* the root nexus (or shouldn't be) The 8X00 main system bus is the TLSB (turbolaser), which has different memory, cpu or I/O modules. The I/O modules KFTIA/KTFTH then send hoses out to outlying boxes. One of these happens to be a DWLPX (pci controller), but many others are possible, including FutureBus (which shows you how *long* futurebus has been rolling around). The 4100 main system bus has MCbus as the main system bus. It has MCPCIA modules which are the PCI interfaces. This is has always been a peeve of mine about *BSD usage of root 'nexus'- the assumption that the PCI chipset is the one and only nexus. On Mon, 24 Jun 2002, Andrew Gallatin wrote: > > M. Warner Losh writes: > > In message: <20020623233355.GE53233@cicely5.cicely.de> > > Bernd Walter <ticso@cicely5.cicely.de> writes: > > : root node is the chipset: > > : [67]cicely9# devinfo > > : cia0 > > > > OK. Is cia the only chipset, or are there others? > > There are many more. > > apecs, dwlpx, irongate, lca, mcpcia, t2, tsunami. > And I'm probably leaving a few out. > > Drew > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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