This is the latest version of my Enhanced SpeedStep driver for cpufreq. 
It supports current Pentium M CPUs.

Intel has not fully documented the MSRs used to control CPU core
frequency and voltage, but they're fairly easy to work out with a bit of
experimentation and from the Intel documentation.

The driver uses built-in tables for all the operating points of known
Pentium M processors, derived from the Table 5 in the Intel Pentium M
datasheet (25261202.pdf).  The tables derived from the datasheet exactly
match the tables in ACPI on my 1.3GHz Pentium M IBM ThinkPad X31.

Because this driver is using undocumented registers, it is careful to
only apply to CPUs which I'm confident that it will work with. 
Therefore, not only does it look for the EST feature bit, but will only
work on Family 6, Model 9, Stepping 5 processors.  It also needs an
exact match on model name when choosing which operating point table to
use.

This is the 3rd iteration of this driver; it adds proper use of the
cpufreq frequency change notifier, which fixes problems with the TSC
changing rate.

It does not (yet) attempt to deal with the processor autonomously
changing performance operating point as part of its automatic thermal
control stuff.

I'm very interested in people trying this on other models of Pentium M
processor.  I've had to guess what the model name string is for other
speed grades, and I'm not sure I got it right.  I'm fairly sure this
driver can't cause physical damage, but it could well cause instability
and/or outright crashes when enabled, so be careful.  It works fine for
me though.

Patch is against 2.5.70-mm8, but it should apply to base 2.5.70.

	J