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Date: Fri, 20 Apr 2007 15:41:57 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Mikko Tiihonen <mikko.tiihonen@iki.fi>
Cc: Andi Kleen <andi@firstfloor.org>, linux-kernel@vger.kernel.org,
       Andy Currid <ACurrid@nvidia.com>
Subject: Re: [PATCH v3] hpet: Detect hidden HPET on NVidia motherboards
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On Wed, 18 Apr 2007 00:57:48 +0300
Mikko Tiihonen <mikko.tiihonen@iki.fi> wrote:

> Enables HPET for NVidia motherboards with broken BIOS. The patch reads
> the HPET address from the pci config space. The patch should also work
> if ACPI is disabled.
> 
> The new quirk activates use of HPET only run if
> - CONFIG_HPET_NFORCE_DETECT is enabled
> - nohpet boot option is not set
> - main chipset is from NVidia
> - ACPI tables do not list HPET
> - matching PCI ID for device with HPET is found
> - BIOS has set up the HPET to some address
> - there is no other resource allocated at the HPET address
> 
> This is true at least for some Asus, Gigabyte and DFI motherboards.
> 
> Patch is against 2.6.21-rc6-git7 but should apply cleanly to most
> kernels.

I looked at applying this but

a) there have been rather a lot of underlying changes in Andi's devel tree and

b) we still haven't heard from Andy?