[coreboot] Patch set updated for coreboot: 6709bdd Fix multipleVGA cards resource conflict on Windows

[She, Kerry]

Hello, Ron

> -----Original Message-----
> From: coreboot-bounces+kerry.she=amd.com at coreboot.org [mailto:coreboot-
> bounces+kerry.she=amd.com at coreboot.org] On Behalf Of ron minnich
> Sent: Monday, December 19, 2011 1:07 PM
> To: Kerry Sheh
> Cc: coreboot at coreboot.org
> Subject: Re: [coreboot] Patch set updated for coreboot: 6709bdd Fix
> multipleVGA cards resource conflict on Windows
> 
> > +               /* It isn't safe to enable multiple VGA cards.
> > +                * Windows will report resource conflict when more than
> one
> > +                * VGA-compatible legacy graphic card in the system.
> > +                */
> > +#if CONFIG_VGA_BRIDGE_SETUP == 1
> > +               extern device_t vga_pri;
> > +               if (((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) &&
> > +                       (dev != vga_pri)) {
> > +                       if (((vga_pri->class >> 8) ==
> PCI_CLASS_DISPLAY_VGA) &&
> > +                               ((dev->class >> 8) ==
> PCI_CLASS_DISPLAY_VGA)) {
> > +                               dev->command &= ~(PCI_COMMAND_IO |
> PCI_COMMAND_MEMORY);
> > +                       }
> > +               }
> > +#endif
> 
> What do Linux or *BSD do in the same situation? Do they handle it cleanly?
Linux VGA Arbiter module(vgaarb) will handle this explicitly.
So dual vga card would works together, even coreboot not disable IO& MEM decoding on the second vga card.
thanks

 
> thanks
> 
> ron
> 
> --
> coreboot mailing list: coreboot at coreboot.org
> http://www.coreboot.org/mailman/listinfo/coreboot