Re: [PATCH V5 3/4] x86/PCI: Stop enabling ECS for AMD CPUs after Fam16h

[Suravee Suthikulanit]

On 5/23/2014 6:56 AM, Robert Richter wrote:
> On 22.05.14 20:54:54, Bjorn Helgaas wrote:
> > I'm going to go out on a limb and guess that Windows does not enable
> > ECS, so it probably uses ECAM.  Therefore, I suspect Linux's parsing
> > of MCFG is broken in some way, and we probably *could* use ECAM in all
> > these cases I'm seeing.
>
> Even if ECS is not enabled the system should be fine anyway, as ECS is
> only used to enable certain features. For family 10h this was
> originally the IBS EILVT (extended interrupt local vector table,
> needed for hw profiling) setup which need to be set by the OS which
> the BIOS didn't right. This should be fixed now and properly set by
> the BIOS on 15h+ systems.
>
> I don't remember what was added to 16h where ECS was needed, I think
> there was one (Suravee?). Not sure if this is essential.

I am not aware of anything specific in the family16h which require 
IO_ECS to be enabled.

Suravee

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