Re: PCI: cardbus bridge

[Zhi Yong Wu <zwu.kernel@xxxxxxxxx>]

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?
> 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)
>
> If you want to know the exact meanings, try the PCI and PCI Express
> specifications.
>
> Stefan



-- 
Regards,

Zhi Yong Wu
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