linux-kernel - Re: [Patch 1/1] x86 pci: Add option to not assign BAR's if not already assigned

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Message-ID: <4BEDDACD.9040704@zytor.com>
Date:	Fri, 14 May 2010 16:20:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Mike Travis <travis@....com>, Bjorn Helgaas <bjorn.helgaas@...com>,
	Mike Habeck <habeck@....com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Jacob Pan <jacob.jun.pan@...el.com>, Tejun Heo <tj@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai <yinghai.lu@...cle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Myron Stowe <myron.stowe@...com>
Subject: Re: [Patch 1/1] x86 pci: Add option to not assign BAR's if not already
 assigned

On 05/14/2010 03:47 PM, Jesse Barnes wrote:
> 
> Wow and they're using cards that want to use I/O space?  Funky.  It's
> too late to get this into 2.6.34, but that can't be what you were
> expecting... I don't see a problem with getting something like this in
> for 2.6.35.
> 

Most cards on the market provide I/O BARs as a convenience to legacy
BIOSes; they don't need the I/O BAR functionality from inside a
full-featured OS.  There are a few, key, exceptions, mainly in the form
of legacy-interface devices like UARTs and VGA (note that VGA has its
own routing bits and is therefore unaffected by this problem.)

	-hpa
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