Messages in this thread | | | From | Jesse Barnes <> | 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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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.
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