Re: [PATCH v2 2/5] x86/PCI: Support additional MMIO range capabilities

[Steffen Persvold]

On 29 Apr 2014, at 3:20 , Borislav Petkov <bp@xxxxxxx> wrote:

> On Tue, Apr 29, 2014 at 09:33:09AM +0200, Andreas Herrmann wrote:
>> I am sure, it's because some server systems had MMIO ECS access not
>> enabled in BIOS. I can't remember which systems were affected.
> 
> Ok, now AMD people: what's the story with IO ECS, can we assume that on
> everything after F10h, BIOS has a sensible MCFG and we can limit this to
> F10h only? I like Bjorn's idea but we need to make sure a working MCFG
> is ubiquitous.
> 
> Which begs the real question: Suravee, why are you even touching IO ECS
> provided F15h and later have a MCFG? Or, do they?
> 

Our experience with this is that Fam10h and later have a very well working MCFG setup, earlier generations not so much (hence IO ECS was needed).

Cheers,
Steffen

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