August H
örandl wrote:
>
> Nicolas Pitre wrote:
> >
> > On Wed, 23 Aug 2000, Vasant Ramasubramanian wrote:
> >
> > > On Tue, 22 Aug 2000, Dwayne Jacques Fontenot wrote:
> > >
> > > > in related news they have discovered how to overclock the ipaq to
> > > > 236MHz (they say). no info yet on how or what the success rate is
> > > > or addition power consumption.
> > >
> > > Not really a big discovery, one just has to update a particular (and
> > > documented ) register. The more important question is are they
> > > appropriately calculating and changing DRAM parameters accordingly?
> >
> > ... and my SA1100 patch actually includes a driver that does just that at
> > run-time for the LART and Assabet.
>
>
> is this two-way -- speeding down to save a lot of battery power when
> the speed isn't needed ?
>
Gustl,
Yes, it does save battery power when the CPU speed is lowered. And in
theory the voltage to CPU could also be adjusted down for further power savings
(although I'm not sure how to do this on the iPAQ).
I have just released a patch on the sa1100-linux@pa.dec.com list that should
enable the bidirectional clock scaling work on the iPAQ (plus it does the
appropriate recalibration of the kernel's timing code (loops_per_sec kernel
variable). I did note that the iPAQ initially boots linux at 191.7 MHz instead
of the 206 MHz I expected.
Enjoy,
Erik
--------------------------------------------------------------------------------
Erik Bunce (mailto:ebunce@lhsl.com)
Chief Software Engineer
Innovations Group
L&H Technologies
Lernout & Hauspie Speech Products, N. V.
Received on Wed Aug 23 09:26:40 2000
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