On Nov 24, 2004, at 10:19 AM, John Baldwin wrote: >> I've been wrong before, but please double-check diagrams like: >> >> http://www.intel.com/design/chipsets/850/pix/850_800.gif >> http://www.viatech.com/en/products/chipsets/p4-series/pt880/ [ ... ] > The northbridge is the host-pci bridge. It contains a virtual PCI-PCI > bridge/bus that represents AGP. Agreed, although AGP is something of a special case. > The chipset uses a propietary interconnect to the southbridge... Such as VIA's V-link. > ...such that the devices the north and south bridges connect > to show up as one pci bus (bus 0). You could build a system without a > southbridge (just PCI-X bridges or some such) and it would still have a > host-pci bridge. You and Scott are correct. pciconf claims that something like a 440BX northbridge (82443BX) contains both a HOST-PCI and a PCI-PCI bridge, whereas the PIIX4 southbridge (82371AB) has a PCI-ISA bridge, as well as ATA and the other things I'd mentioned. I apologize if I confused the person I was trying to answer. -- -ChuckReceived on Wed Nov 24 2004 - 16:27:07 UTC
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