On Thu, May 24, 2012 at 5:21 PM, Stefan Hajnoczi <stefanha@xxxxxxxxx> wrote: > 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. thanks > >>> 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 -- Regards, Zhi Yong Wu -- 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
