[7374] in linux-scsi channel archive
Re: HP NetServer LHr3/aic7xxx Help??
daemon@ATHENA.MIT.EDU (Gerard Roudier)
Tue Oct 19 14:40:11 1999
Date: Tue, 19 Oct 1999 20:58:19 +0200 (MET DST)
From: Gerard Roudier <groudier@club-internet.fr>
To: Doug Ledford <dledford@redhat.com>
cc: Jes Sorensen <Jes.Sorensen@cern.ch>,
"casler, heather" <casler_heather@emc.com>,
"'linux-kernel'" <linux-kernel@vger.rutgers.edu>,
"'linux-scsi'" <linux-scsi@vger.rutgers.edu>
In-Reply-To: <Pine.LNX.3.96.991019115544.1037C-100000@devserv.devel.redhat.com>
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On Tue, 19 Oct 1999, Doug Ledford wrote:
> On Mon, 18 Oct 1999, Gerard Roudier wrote:
>
> > The devices that appeared to be detected twice seem to be the ones that
> > reside on secondary PCI BUSes. At the time we have had to look into this
>
> Peer PCI busses to be more accurate. The problem is that the PCI probe
> code will probe the peer busses that are behind a 451NX chipset without
> needing a bridge device to guide them there (which is correct) but in
> order to make legacy PCI probe code from other OSes work on the system, HP
> put some "fake" bridge devices on pci bus 0 that *also* point to the same
> busses as the peer bus configuration registers on the 451NX chipset. Net
> result, we probe the bus twice. There is a patch that fixes this in the
> 2.2.12 kernel we shipped, and I also gave that patch to Martin and it has
> been forward ported to his 2.3 stuff. It handles more than just the 451NX
> chipset, it also does the two RCC chipsets that have peer busses and it
> handles the Compaq hot plug PCI chipset in use on most 8way x86 boxes
> today.
Thanks a lot, Doug, for your accurate explanation.
No more comments, given that your employer is throwing away any posting
from me for this discussion.
Gérard.
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