Sean's speech at ESC about making a 3G device

Carsten Haitzler (The Rasterman) raster at
Sun Apr 5 12:19:31 CEST 2009

On Sun, 05 Apr 2009 11:45:28 +0200 Gunnar AAstrand Grimnes
<gunnar.grimnes at> said:

> > Upgrade S3C2442B to S3C6410.
> Not that it matters, but the N810 seems to achieve really good
> suspend/resume behaviour and excellent battery life with a dual core

it never suspends/resumes. it is always runing. it uses an omap feature called
"zero clock" - the cpu literally stops its clock. registers self-refresh (and
ram) like suspend, but on any interrupt (timer, device) it starts running again
really fast - nothing is shut down and brought up like suspend/resume. its more
like a really smart cpufreq that has a 0mhz option. :)

> CPU, i.e. one high-performance core that suspends and another one that
> watches for touch-screen events, etc. and wakes up the other one when
> something happens. Samsung doesn't make anything like this?

no. though you could use a pm for this... but really. "zero clock" does this
effectively.. on 1 core. :)

> (n810 uses the omap2420:
> - Gunnar
> _______________________________________________
> Openmoko community mailing list
> community at

------------- Codito, ergo sum - "I code, therefore I am" --------------
The Rasterman (Carsten Haitzler)    raster at

More information about the community mailing list