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

Please check the archives. Hpcboot will *NOT* directly boot a linux elf
kernel image w/o modification to either hpcboot or the kernel startup
code. Details in the archive.

-ch

> -----Original Message-----
> From: jornada-admin_at_handhelds.org
> [mailto:jornada-admin_at_handhelds.org] On Behalf Of Peter Gerwinski
> Sent: Sunday, June 23, 2002 4:45 PM
> To: John Ankcorn
> Cc: jornada_at_handhelds.org
> Subject: 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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Received on Mon Jun 24 2002 - 03:09:42 EDT