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Hi,

I have written a driver for AMD's POWERNOW function on K7 CPUs. It
enables CPU frequency scaling which allows laptops with AMD K7 CPUs to
have longer battery life and stay cool.

http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_10220_1022=
1%5E964,00.html

I have made it compatible to i386/est.c (Intel SpeedStep) sysctl's interfac=
e.

example :

# sysctl machdep.powernow.
machdep.powernow.frequency.target =3D 1795
machdep.powernow.frequency.current =3D 1795
machdep.powernow.frequency.available =3D 532 665 798 931 1330 1795

# sysctl -w machdep.powernow.frequency.target=3D532
machdep.powernow.frequency.target: 1795 -> 532

I have included patches to make this driver work with NetBSD 2.0G,
make sure you add "options POWERNOW_K7" in your kernel configuration
file.

Todo:
- Multiprocessor support?
- line 181 of pnow_k7.c (cpuid =3D=3D 0x?60 .. ignored for now)
...

Enjoy=20

Martin V=E9giard

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