Arjan van de Ven wrote:
On Mon, 14 Jan 2008 08:01:01 -0500
Tony Camuso <[EMAIL PROTECTED]> wrote:
>>
If we're going to differentiate MMCONFIG from
some other access mechanism, it only needs to be done at the
Northbridge level. Devices are electrically ignorant of the protocol
used between CPU and Northbridge to get the Northbridge to assert
config cycles on the bus.
Again this is about having systems that don't need extended config space not
use it. At all.
The only way to do that is have the drivers say they need it, and not use it
otherwise.
It has NOTHING to do with how things are wired up. It's pure a kernel level
policy decision
about whether to use extended config space AT ALL.
The problem with compelling device drivers to determine the PCI
config mechanism is that it must be forced upon arches that
have no PCI configuration quirks or don't even use the same
PCI config mechanisms as x86.
I don't think that's a good policy.
Better to confine arch-specific quirks to the arch-specific code
whenever possible.
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