Re: [jornada] Re: Kernel source? (Power managememt for HP Jornada 720)

John Ankcorn wrote:
> I have just updated the sources in the handhelds.org
> linux source tree for the following functionality:
> 1) Power management support for the 720
> [...]

I just checked out linux/kernel from handhelds.org - 172.6 MB of
source code.

1) It does not compile until I comment out line 137 in pm.c:
     GFER = GPIO_H3800_AC_IN
   Since we do not have a H3800 this should make no difference.
   However this line should not be needed in the first place.

2) The compiled kernel does not boot. It stops after "Uncompressing
   Linux...".

> Note that if you are using the handhelds bootldr (i.e., you have
> an internal flash replacement card), there are also mandatory
> changes to allow wakeup after sleep. I am not sure how this
> is all going to work for the people running under Wince. [...]

All I have is hpcboot.

If there is a possibility to obtain a real bootloader for my Jornada
instead of MS-Windows CE, I would be interested in purchasing one.
Any pointers?

> Wince boot loader is nice enough to 1) recognize that it is
> waking up from sleep and 2) to just to a 'return' to pop the
> restart execution address off the stack, then the power on/off
> button should work.
>
> If you (or anyone else) tries to debug the power off/on logic
> under wince, I can point you at the relevant source files
> in the kernel tree (but you should go into this expecting
> a fair amount of pain!).

Hmm... does this mean that, although I booted Linux, MS-Windows CE
is still in the way when I want to use power management? No chance
to put Linux asleep until I press a key, or similar?

While a real power on/off would be great I would be satisfied for
now with the possibility to save battery power by turning the screen
backlight off because this would allow me to start _using_ my
Jornada.

Unless anyone has a better idea, I will try next to backport the PM
changes to the working linux-2.4.18-rmk2-hh2-jornada720 kernel.
(Although this is not related to MS-Windows CE, a pointer to the
relevant source files would be nice.)

    Peter

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