linux-kernel - Re: SNB PCI root information

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Date:	Thu, 21 Jun 2012 07:56:24 +0200
From:	Brice Goglin <brice.goglin@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ulrich Drepper <drepper@...il.com>, jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lenb@...nel.org, x86@...nel.org, linux-pci@...r.kernel.org
Subject: Re: SNB PCI root information

Le 21/06/2012 04:43, Yinghai Lu a écrit :
> On Wed, Jun 20, 2012 at 12:57 PM, Brice Goglin <brice.goglin@...il.com> wrote:
>> Le 20/06/2012 21:28, Yinghai Lu a écrit :
>>> On Wed, Jun 20, 2012 at 11:46 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> I agree that the most common problem is that _PXM is missing. But I've
>> seen at least some HP Westmere-EP platforms where _PXM exists but it is
>> wrong. Last time we checked, there was no BIOS update, even if we
>> reported the bug a while ago.
>>
> Do you have boot log or acpi dump?
>
> I suspected that could be other problem. intel system before
> sandbridge does not have IIO.
> they will have ioh instead, and one ioh would connect to two cpu sockets.
> but _PXM for root bus in dsdt only can return one value. Aka it is
> acpi spec limitation.

The machines I am talking about have two IOHs (one connected to each
socket). I only have an old 2.6.27 boot log at hand, I'll ask my admins
for more. Do you want the 2.6.27 dmesg anyway?

Brice

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