linux-kernel - Re: [PATCH] x86, HPET: ignore any PCI BARs that match an HPET we already know about

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Message-ID: <4C9A7CE4.2070406@zytor.com>
Date:	Wed, 22 Sep 2010 15:02:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Venkatesh Pallipadi <venki@...gle.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Simon Arlott <simon@...e.lp0.eu>, x86@...nel.org,
	Clemens Ladisch <clemens@...isch.de>,
	linux-kernel@...r.kernel.org, Marc Jones <marcj303@...il.com>,
	Jordan Crouse <jcrouse@...eaurora.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86, HPET: ignore any PCI BARs that match an HPET we
 already know about

On 09/22/2010 02:52 PM, Bjorn Helgaas wrote:
> 
> It really doesn't look like Windows, and therefore BIOS writers,
> share your expectations about PCI BARs in E820 reserved areas.
> It's likely still *safe* to make them fixed resources, but we might
> be able to fix more issues if we knew how Windows avoids the problem.
> 

*Which Windows*!?  Each version of Windows works differently, with
different quirks and bugs, and the BIOS vendors only ever test the
currently shipping version (except sometimes on server boards.)

	-hpa
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