Messages in this thread |  | | Date | Fri, 17 Nov 2000 12:03:21 -0500 | From | Jeff Garzik <> | Subject | Re: VGA PCI IO port reservations |
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Russell King wrote: > Jeff Garzik writes: > > If XFree86 not fbdev is using the hardware, you can always have a stub > > driver that does nothing but reserve the ports. Remember, too, that the > > ports claimed depend on register settings in the video card and PCI > > config space.. > > I wish. Unfortunately, ones of this nature tend to be rather fixed. No amount > of config space twiddling will move them. However, as someone else pointed out, > x86 gets around this problem by only allowing IO ports to be allocated in the > (addr & 0x0300) == 0 range, thereby avoiding the problem.
Dig through the video card docs, even older ISA video cards let you disable I/O decoding on all but a few ports, and/or relocate the ports it does use to other areas. Different with every video card, of course, but most of them can do this to a greater or lesser extent.
Jeff
-- Jeff Garzik | Building 1024 | The chief enemy of creativity is "good" sense MandrakeSoft | -- Picasso - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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