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

[Laurent Vivier]

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

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

Regards,
Laurent