[OpenBIOS] [PATCH] pci: enable io/memory unconditionally

Laurent Vivier Laurent at vivier.eu
Thu Dec 10 01:20:23 CET 2009

Le mercredi 09 décembre 2009 à 17:53 +0200, Michael S. Tsirkin a écrit :
> VGA adapters need to claim memory and i/o
> transactions even if they do not have any
> i/o or memory bars. E.g. PCI spec, page 297,
> gives an example of such a device:
>     Programming interface 0000 0000b
>     VGA-compatible controller. Memory
>     addresses 0A 0000h through 0B
>     FFFFh. I/O addresses 3B0h to 3BBh
>     and 3C0h to 3DFh and all aliases of
>     these addresses.
> While bios could check for these devices and special-case them, it is
> easier to fix this by enabling i/o and memory space unconditionally:
> devices that do not support it will just ignore this setting.
> Signed-off-by: Michael S. Tsirkin <mst at redhat.com>

Applied, but could you give me an use case where previous behavior
breaks something ?

--------------------- laurent at vivier.eu ----------------------
"Tout ce qui est impossible reste à accomplir"    Jules Verne
"Things are only impossible until they're not" Jean-Luc Picard

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