Re: [jornada] Jornada 72x PM current status?

On Tue, May 17, 2005 at 09:59:54PM +0100, Colin Sauze wrote:
> if/when we get 2.6 kernels working we should be able to throttle the CPU
> speed back which should help.

After looking at the cpufreq code in kernel 2.6, I believe
clock-throttling is currently unsupported on the Jornada 720.
There are no sdram timing-values for the j720 in the 2.6 cpufreq-driver,
which automatically disables it on this machine.

I just hacked throttling to 59mhz when the fake "suspend" mode
is entered into my 2.4.30 port and added timing values for
the samsung sdrams at least some j720s use. This works fine on
my machine, but I can't tell if it will work on a 728...

The new kernel linux-2.4.30-vrs1-pxa1-j720-2 should be on my website
in a few minutes and you should see something like the following in
dmesg, when pressing the power-button:

Suspend!
Display OFF
Old CPU frequency: 206400, new CPU frequency: 59000

and "resume" again:
Suspend!
Old CPU frequency: 59000, new CPU frequency: 206400
Display ON

> I think some advantage might also be
> gained by turning off PCMCIA/CF cards and halting processes.

I'm working on it, but the kernel doesn't like when it's root device
is suddenly switched off. Need to find a solution for that first.

Regards,
  Michael
Received on Tue May 17 2005 - 19:58:37 EDT