> But it is needed for some devices for full functionality.
Examples? I can only think of PCI express error reporting, which
few drivers implement anyways and isn't really a show stopper
if it doesn't work. Besides I would be surprised if it even works
on the cheap desktop boards which have MCFG less BIOS.
> E.g. for perfmon (family 0x10/extended inerrupts) extended config space
> access is a prerequisite.
How so?
>
> IMHO it is best to try to use MMCONFIG if it's working and to use
> a fallback (e.g. CF8 ECS access for family 0x10) if available.
We only put in workarounds if there is a serious problem otherwise (e.g. not
booting etc.). I just don't see this here.
-Andi
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