To: linux-kernel@vger.kernel.org
From: hpa@zytor.com (H. Peter Anvin)
Subject: Re: Patch to control VGA bus routing and active VGA device.
Date: Tue, 18 Jan 2005 19:38:44 +0000 (UTC)
Organization: Mostly alphabetical, except Q, which We do not fancy
Message-ID: <csjok4$gn3$1@terminus.zytor.com>
References: <9e47339105011719436a9e5038@mail.gmail.com> <200501180946.47026.jbarnes@engr.sgi.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7BIT
NNTP-Posting-Date: Tue, 18 Jan 2005 19:38:44 +0000 (UTC)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 945
Lines: 23

Followup to:  <200501180946.47026.jbarnes@engr.sgi.com>
By author:    Jesse Barnes <jbarnes@engr.sgi.com>
In newsgroup: linux.dev.kernel
>
> On Monday, January 17, 2005 7:43 pm, Jon Smirl wrote:
> > Attached is a patch to control VGA bus routing and the active VGA
> > device. It works by adding sysfs attributes to bridge and VGA devices.
> > The bridge attribute is read only and indicates if the bridge is
> > routing VGA. The attribute on the device has four values:
> 
> How is it supposed to work?  Is VGA routing determined by the chipset?  Is it 
> separate from other legacy I/O and memory addresses?
> 

Yes, there are special control bits in any PCI bridge header for the
VGA ports.

	-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/