The open-graphics people had this question a while back, I think I took a look at some different platforms and BIOSes: http://lists.duskglow.com/open-graphics/2007-August/010402.html
Turning on the decoders for only one of each type of legacy device sounds right. On Mon, Dec 19, 2011 at 6:13 PM, She, Kerry <kerry....@amd.com> wrote: > Hello, Patrick > >> -----Original Message----- >> From: coreboot-boun...@coreboot.org > [mailto:coreboot-boun...@coreboot.org] >> On Behalf Of Patrick Georgi >> Sent: Tuesday, December 20, 2011 1:31 AM >> To: coreboot@coreboot.org >> Subject: Re: [coreboot] Patch set updated for coreboot: 6709bdd Fix >> multipleVGA cards resource conflict on Windows >> >> Am 19.12.2011 18:02, schrieb ron minnich: >> > I wonder if a better way to manage this is via a CMOS (aka NVRAM) >> > setting. >> No user visible configuration if it can be avoided, please. >> >> > I kind of hate to limit coreboot because Windows is limited. >> > But I'm a n00b in a sense, having just come back onto this project, > so >> > I'm happy to be told I'm wrong :-) >> It sounds just wrong to have IO/MEM decoding on the _same_ areas >> activated for two devices. > Yes, exactly. > >> vgaarb should still work with one of them having resources disabled by >> default, I think. > I have tested Linux vgaarb still works. > We just do a part of the vgaarb job in coreboot. > >> Otherwise coreboot would be the _only_ chance for vgaarb to work, as > all >> other boot systems will support Windows even to the detriment of Linux >> support. >> Which means that vgaarb wouldn't exist, given their position towards >> coreboot. > It make sense on the OS lacking a mechanism like vgaarb. > Anyway, more test on different OS is needed. > Thanks > >> >> > Changing circumstances mean I get to work on it >> > again, which is nice. >> Yay! >> >> >> Patrick >> >> -- >> coreboot mailing list: coreboot@coreboot.org >> http://www.coreboot.org/mailman/listinfo/coreboot > > > > -- > coreboot mailing list: coreboot@coreboot.org > http://www.coreboot.org/mailman/listinfo/coreboot -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot