Re: adding machdep frequency support?

[mlelstv%serpens.de@localhost (Michael van Elst)]

joerg%britannica.bec.de@localhost (Joerg Sonnenberger) writes:

>Not relevant for the EST discussion. Hm. it has EST in features2, so it
>should normally be enabled. Can you get a boot -x dmesg please?

The processor will report minimum and maximum values for EST and
est.c will interpolate some intermediate values and poke the
corresponding registers.

However, modern CPUs will report minimum == maximum and est.c 
will just ignore EST because it has no means to guess correct
values.

The only supported way for frequency control on such a CPU is
to use ACPI, which we do not support.

This is especially true on those CPUs that support 'overdrive',
i.e. clocking one core higher if a second core isn't used.

-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."