Date: Thu, 3 Apr 2003 15:30:17 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: "Kevin A. Pieckiel" <kpieckiel@smartrafficenter.org> Cc: freebsd-alpha@freebsd.org Subject: Re: AS1200 Message-ID: <16012.39385.672997.35768@grasshopper.cs.duke.edu> In-Reply-To: <20030403201620.GC90878@pacer.dmz.smartrafficenter.org> References: <20030403131752.GA90878@pacer.dmz.smartrafficenter.org> <20030403185510.GA6302@freebie.xs4all.nl> <20030403193738.GB90878@pacer.dmz.smartrafficenter.org> <16012.37153.407140.240893@grasshopper.cs.duke.edu> <20030403201620.GC90878@pacer.dmz.smartrafficenter.org>
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Kevin A. Pieckiel writes: > On Thu, Apr 03, 2003 at 02:53:05PM -0500, Andrew Gallatin wrote: > > > Bear in mind that there are some circumstances where 4.x doesn't work > > on a 1200. Most notably when there is an NCR scsi controller on a > > non-zero hose. If you have problems installing 4.x, you may need to > > use 5.0. > > Non-zero hose? I've not heard that terminology before. Would you please > define/explain this? I'm pretty sure (but not positive) it has an NCR > controller. I'll verify when I actually have my hands on the machine > within a few weeks. > Alpha do peer buses differently. Rather than having multiple connections to the host system appear as fake pci-pci bridges like x86s do, each connection to the host system is called a "hose". Each hose has its own address space, and has its own tree of pci buses. Eg, hose 0 has a pci bus #0, and #1, etc, hose 1 has a pci bus #0, #1 #2, etc. The address space on hoses other than hose #0 is handled via a hack in 4.x, and some boards don't work because of that. This is done right in 5.x You can search the archives for more info. Drewhome | help
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