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SubjectRe: 256 apic id for amd64
On Fri, Jan 07, 2005 at 04:26:57PM -0800, James Cleverdon wrote:
> Already done, although not dividing along AMD vs. Intel lines.
> phys_pkg_id() indirects through the subarch table. See
> genapic_cluster.c and genapic_flat.c for details.
>
> We may need a third subarch for AMD's Extended APIC mode boxes.

I'm not convinced we do. Things seem to work with BSP APIC-ID = 0.
Is there any real reason to not just require that?

>
> Can you suggest some heuristics for detecting such a system and
> discerning it from a clustered APIC box? (Hopefully, without using MPS
> or ACPI table ID string lookups.)

Early PCI scan would work in the worst case. All Opterons have a builtin
northbridge with a specific ID. There is already other code that
checks for these.

-Andi

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