Re: APIC version and 8-bit APIC IDs

[Martin Wilck <martin.wilck@fujitsu-siemens.com>]

Maciej W. Rozycki wrote:

>  You are unfortunately mistaken -- the spec is explicit about *local* APIC 
> IDs having to start at 0.  There are at least two places in the spec that 
> refer to that.

I see. Thanks for the clarification.

>  You can always assign 0, 16, 17, etc. to local APICs and then 1, 2, 3, 
> etc. for I/O APICs.  

Actually, that's what we did (I messed thinks up in my posting). I think 
that's an ugly configuration, though, and totally misleading in terms of 
system topology.

> Frankly I don't know what the actual justification 
> behind the requirement is.  Note that the ID of 0 need not necessarily 
> belong to the BSP.

Starting both local APICs and IO-APICs at 0 isa working and 
aesthetically pleasing solution. We're pursuing that now.

Thanks again, Martin

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