Re: pci bus 1

From: H. Peter Anvin (hpa@transmeta.com)
Date: Tue Apr 04 2000 - 17:27:15 EST


Followup to: <Pine.LNX.4.10.10004041654420.20176-100000@saturn.homenet>
By author: Tigran Aivazian <tigran@veritas.com>
In newsgroup: linux.dev.kernel
>
> Hi Seven o'clock,
>
> I suspect you are joking because, of course, Linux PCI subsystem goes
> recursively scanning all PCI buses. If you look at the way, e.g.
> pcibios_allocate_bus_resources() calls itself recursively for all its
> "children", you will understand what's going on.
>
> If Linux was limited to one PCI bus it wouldn't have become the #1
> enterprise level general purpose operating system.
>

It might be worth checking out if it handles "host peer bridges"
(multiple host-pci bus bridges) correctly, that is more than one PCI
bus hanging off the host bus. This means not all PCI busses are
reachable from bus 0.

          -hpa

-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."

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