Hi,
as we now have the first prototypes running so far, I was able to do
some testings with them.
Right now, the OMAP5 seems to eat quite a bit of power, even when
basically doing nothing (a LOT more than the DM3730 or OMAP3 uses).
Having it idling around doesn't use less power than running LibreOffice
and typing a text, for example.
Right now, I get about 6 - 7 hours of usage with a 6000mAh battery (and
everything enabled), whereas I have about 8 hours with a 4400mAh
battery (and also everything enabled) on the Pandora.
I think Nikolaus mentioned at some time that power saving features for
the OMAP5 are missing in the kernel (SmartReflex maybe?), so I wanted
to check for the status about that and what can be improved.
In theory, the OMAP5 should use less power for the same tasks the
DM3730 or OMAP4 can do, but use more power for more CPU usage (which
sounds logical).
Right now, it seems the kernel is fixed to 1GHz and 1,5GHz (or 500Mhz
and 1GHz on our kernel, as we changed the settings).
If I understood correctly, it only uses these settings.
Does that mean it will always use at least the power it needs to run at
500Mhz? AFAIR, the DM3730 / OMAP3 can go down to around 30Mhz.
So the question is, how can we improve that?
* Add more voltages so it can scale better? (how low can the OMAP5 go?)
* Is SmartReflex active, can this be checked? Is that something that
can be improved?
Idling around, the Pandora can hold up to 40 hours... so the Pyra
should be able to do more with a 6000mAh battery.
And at least my Smartphone with an OMAP4 can idle for over 20 hours with
a 1500mAh battery, the OMAP5 can't be that much different.
What are we missing here?
--
Mit freundlichen Grüßen,
Michael Mrozek
-----------------------
OpenPandora GmbH
Geschäftsführer: Michael Mrozek
Schäffbräustr. 11
85049 Ingolstadt
Deutschland
Tel.: 0841 / 990 5548
http://www.openpandora.de/
HRB 4879, Amtsgericht Ingolstadt
-----------------------
eMail: mrozek(a)openpandora.org