From: Jesse Barnes <jbarnes@engr.sgi.com>
To: "H.Peter Anvin" <hpa@zytor.com>
Subject: Re: Patch to control VGA bus routing and active VGA device.
Date: Tue, 18 Jan 2005 13:06:03 -0800
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References: <9e47339105011719436a9e5038@mail.gmail.com> <200501180946.47026.jbarnes@engr.sgi.com> <csjok4$gn3$1@terminus.zytor.com>
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On Tuesday, January 18, 2005 11:38 am, H. Peter Anvin wrote:
> > 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.

Well, not all of them, which is why I asked.  Though obviously this patch will 
need some very platform specific bits at any rate.

Jesse
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