linux-kernel - Re: SNB PCI root information

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Message-ID: <CAE9FiQWBB0JVCLWa40k9qYJXGrv_z=RgspgQW4x2di0uCUFXmA@mail.gmail.com>
Date:	Thu, 21 Jun 2012 12:24:07 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Brice Goglin <brice.goglin@...il.com>
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

On Wed, Jun 20, 2012 at 10:56 PM, Brice Goglin <brice.goglin@...il.com> wrote:
>> 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?
>

log from 2.6.27 should be good enough for this.

BIOS _PXM return 0 for both pci root buses?

those systems with two IOHs really deserve good BIOS.

Hope we can have more updated machines with open sourced firmware.

Thanks

Yinghai
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