On Wed, Jan 8, 2014 at 2:48 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> On Wednesday 08 January 2014 15:43:20 Tomi Valkeinen wrote:
>> On 2013-12-18 01:37, Mark Brown wrote:
>> > From: Mark Brown <broonie@xxxxxxxxxx>
>> >
>> > arm64 is unlikely to have a VGA console and does not export screen_info
>> > causing build failures if the driver is build, for example in all*config.
>> > Add a dependency on !ARM64 to prevent this.
>> >
>> > This list is getting quite long, it may be easier to depend on a symbol
>> > which architectures that do support the driver can select.
>>
>> I agree, that depends on looks horrible =).
>
> I've suggested creating a "CONFIG_PC_IO" symbol before that could used
> to simplify this one and a couple of other similar Kconfig statements.
> It is unfortunately a bit tricky because out of the dozen drivers that
> are similar to this one, each one has a slightly different list of
> architectures, and it's not clear which of the differences are intentional
> rather than mistakes.
VGA is special, in that it uses "ISA memory space". This is not a subset of
"PCI memory space", but something different. Some PCI host bridges
(IIRC, e.g. on Mac) do not allow access to this space.
Most other "PC I/O" use ISA I/O space, which is a subset of PCI I/O space.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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