[kwlug-disc] unclear about PCI/USB host bus and device addressing

Robert P. J. Day rpjday at crashcourse.ca
Tue May 25 04:56:55 EDT 2010


On Mon, 24 May 2010, John Van Ostrand wrote:

> ----- "Robert P. J. Day" <rpjday at crashcourse.ca> wrote:
>
> > since i'm just about to rewrite some linux USB driver documentation,
> > i figure i should nail down the mechanics of PCI/USB addressing.
> >
> >   starting with PCI, as i've always understood it, a full PCI address
> > is
> >
> >   domain:bus:slot.func
> >
> > where the "domain" part is irrelevant unless you have more than
> > one host bridge on your system.
>
> Out of curiosity I checked some of the beefiest servers we have in
> production and none of them have more than one PCI domain.
>
> Too bad you didn't ask two weeks ago, we just had really big
> multi-chassis servers in here which might have had more than one PCI
> domain. It may be a while until I have another pair to check out.

    so we just have to wait until john gets a pair.  ok, then ...

rday

-- 

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA

            Linux Consulting, Training and Kernel Pedantry.

Web page:                                          http://crashcourse.ca
Twitter:                                       http://twitter.com/rpjday
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