On Thu, May 24, 2012 at 9:56 AM, Zhi Yong Wu <zwu.kernel@xxxxxxxxx> wrote: > On Thu, May 24, 2012 at 4:37 PM, Stefan Hajnoczi <stefanha@xxxxxxxxx> wrote: >> On Thu, May 24, 2012 at 9:26 AM, Zhi Yong Wu <zwu.kernel@xxxxxxxxx> wrote: >>> Does anyone let me know what cardbus bridge is used for? What is the >>> difference between it and comon pci bridge? >> >> CardBus is PCMCIA (PC Card): >> >> http://en.wikipedia.org/wiki/PC_Card#CardBus >> >> It's not used very much anymore. There is PCI <-> PCMCIA integration >> and that's why you see it come up in PCI code. > got it. thanks. >> >>> By the way, someone usually mentioned pci host bridge, pci root >>> bridge. What the differences among them are? >> >> I'm not sure what the exact difference is. PCI "root" bridge refers >> to the hierarchical nature of PCI, while PCI "host" bridge refers to > You mean that PCI "root" bridge is one alias of another some bridge? The root bridge is the root of a tree of PCI busses. It's the bus that the host interacts with - there may be PCI bridges that attach additional busses. BTW I don't know the terminology, maybe it's PCI "domains" not "busses". Again, you'd have to look at the PCI specification to get the exact definition. >> connecting the computer to the PCI bus. > I guess that PCI "host" bridge is the one which connects PCI bus 0 to > host bus, and it should be contained in PMC chipset (PCI Bridge and > Memory Controller) Yes. Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
