On Tuesday 15 June 2010 10:21:06 Paul E Condon wrote:
> But for these packages, if the
> instruction set for the two classes of chip are the same, what is it that
> is different from the point of view of the kernel software requirements?

The micro-architecture.  Basically, how the instruction set is implemented in 
transistor layouts inside the IC.  Instruction ordering is part of it.

(Also, the instruction set used by -686 packages is actually larger than the 
instruction set used by -484 packages.)
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