get_cycles/get_tbl on 405

[Benjamin Herrenschmidt]

>I wanted to do some quick time measurements of some things on a driver
>running of the 405GP and I eneded up using get_tbl(). It seems like
>get_cycles should be the more standard way to get a tick count but
>it seems to return 0. I don't get the __ftr_fixup stuff in timex.h
>so I am not sure what it is trying to do differently from get_tbl.

The __ftr_fixup in timex.h adds a reference to this code in the
feature fixup section. This allow the code that access the TB to
be nop'ed out on CPUs that don't implement it (601)

Ben.


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