linux-kernel - Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well as x86

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Message-ID: <1270846862.1477.788.camel@groeck-laptop>
Date:	Fri, 9 Apr 2010 14:01:02 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
CC:	Yinghai <yinghai.lu@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Andy Isaacson <adi@...apodia.org>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well
 as x86_32

On Fri, 2010-04-09 at 16:44 -0400, H. Peter Anvin wrote:
> On 04/09/2010 01:31 PM, Guenter Roeck wrote:
> > 
> > It is used for a custom FPGA implementing a watchdog timer and some
> > other functionality.
> > 
> > This is not a matter of supporting such a device in Linux, it is a
> > matter of explicitly excluding non-VGA devices from using VGA memory
> > space.
> > 
> > If that is the decision, it might be worthwhile mentioning it somewhere
> > in the documentation, to prevent others from ever using that memory
> > space in an embedded system (and to save them the time needed to find
> > out about it and to identify and implement a workaround).
> > 
> 
> "Don't use legacy fixed-function addresses for nonstandard purposes."
> 
> There, there is your documentation.

Fair and good enough, as long as it is going to show up somewhere.

Guenter


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