[PATCH] implement AT_PLATFORM for powerpc

Kumar Gala galak at kernel.crashing.org
Wed Jan 11 17:10:02 EST 2006

On Jan 10, 2006, at 11:08 PM, Paul Mackerras wrote:

> Kumar Gala writes:
>> We should probably add two new AT_PLATFORM: "ppc8548" and "ppc5554".
>> "ppc8548" should be used for e500v2, and "ppc5554" for "e200z6".
> How different are they in user-level ISA or in instruction scheduling
> requirements?

8548 adds embedded double precision instructions.  e200/e500 are  
hugely different from a scheduling point of view.

>> You aren't seeting PPC_FEATURE_BOOKE for anything.  We need to be  
>> a little
>> careful since 'isel' isn't implemented in the very first 440's.
> Oops, I must have sent the wrong version of the patch.  Do we know
> which 440s have or don't have isel?

Not 100% sure, hopefully Matt Porter or someone else a bit more  
familiar with the 440's will chime in.

- k

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