From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: Robert Hancock <hancockr@shaw.ca>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
bluesmoke-devel@lists.sourceforge.net
Subject: Re: [PATCH] pci-quirks: Unhide 'Overflow' device on i828{6,7}5P/PE chipsets
Date: Wed, 24 Dec 2008 00:54:51 +0100 [thread overview]
Message-ID: <20081223235451.GA1796@rere.qmqm.pl> (raw)
In-Reply-To: <495175B2.60307@shaw.ca>
On Tue, Dec 23, 2008 at 05:35:14PM -0600, Robert Hancock wrote:
> Michał Mirosław wrote:
> >As I found out from EDAC driver sources for i82875P some BIOSes for
> >i82875P/PE hide 'overflow' device 6. The same thing happens for
> >i82865P/PE chipsets.
> >
> >After testing this patch for couple of days on my laptop (i82856P)
> >it looks like something is resetting device 0 (MCH) config register
> >0xF4 to zero and effectively disabling the device again. The delay
> >looks random to me. I can easily update the register using
> >'hexedit /sys/bus/pci/devices/0000\:00\:00.0/config' and see
> >correct values in lspci output afterwards.
> Could be the BIOS is using the device in SMI code or something (and
> that's what disables it), therefore it may be unsafe to unhide this device.
I'm going to dig into this deeper in my spare time. Googling around
for 'System Management Mode' gave interesting pointers...
Best Regards,
Michał Mirosław
next prev parent reply other threads:[~2008-12-23 23:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-23 21:50 [PATCH] pci-quirks: Unhide 'Overflow' device on i828{6,7}5P/PE chipsets Michał Mirosław
2008-12-23 23:35 ` Robert Hancock
2008-12-23 23:54 ` Michał Mirosław [this message]
2009-01-01 19:02 ` [PATCH 2.6.28 1/3] PCI-quirks: Unhide MCH5/6 memory controller configuration device Michał Mirosław
2009-01-01 19:05 ` [PATCH 2.6.28 2/3] EDAC: Use 'overflow' device for binding i82875 EDAC driver Michał Mirosław
2009-01-01 19:06 ` [PATCH 2.6.28 3/3] EDAC: Add support for i82865P/PE chipsets Michał Mirosław
2009-01-05 19:20 ` [PATCH 2.6.28 1/3] PCI-quirks: Unhide MCH5/6 memory controller configuration device Jesse Barnes
2009-01-05 20:28 ` Michał Mirosław
2009-01-05 20:30 ` Michał Mirosław
2009-01-05 21:02 ` Jesse Barnes
2009-01-06 19:02 ` Bjorn Helgaas
2009-01-06 20:21 ` Jesse Barnes
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