When I soft reset or my jornada 720 run out of battery I can't boot anymore my 720 on wince

when I run the ppc, it hang on a super bright screen with the hp logo.

I've to remove the battery and the cr2032 to pass this screen !!!

what is the problem

my 720 run mongo with 2.6.19-rc6 kernel

I've the same prob. I do not have a backup battery in my Jornada 710. I try to never reboot my J.

This will most likely never be fixed. The reason is simply that when you soft reset the jornada
the bootrom expects the wince information to be left inside the ram so it simply can pick up from where it left of.
Since we are running linux before softreset the memory doesnt contain anything relevant from wince, so when the bootrom tries to jump into wince memory it instead finds everything
messed up and simply freezes.
Only way to fix this is to reset the jornada and let wince start from zero again.

A way to fix this would be to create an memory image of the ram and move that back into ram before entering suspend/halt. This is hard since we already mess with the memory inside the bootloader.
We could also use the semi-suspend mode which filip worked on. But it will never draw as little power as true suspend.

On the flashboards this problem doesnt exist, since we control the content of the rom and
can adapt it the way we want.

hope that explains it somewhat.

Thank you very much for the explanation. I've learned some more about how Jornada's hardware works.

ok the device also freeze after sometime when I push the power button.
and waiting an hours without touching it.

anybody can explain me if I can hard reset my jornada 720 without removing the backup battery.

pretty anoying to take screwdriver with me all the time.

If one uses Jlime then there is no reason to have the backup battery in there. Because every time one restarts Jlime the internal memory is completely wiped. And the backup battery is only there to preserve the internal memory (if the regular battery should run out of power or if one replaces it). That way WinCE can take off where it left (see Kristoffer's explanation).

The backup battery is only there for WindowsCE. If you use both WinCE and Jlime then the backup battery is useless. Because every time you switch from WinCE to Jlime the internal memory is wiped.

I'm afraid you should remove the backup battery as long as you use another ooperating system next to Jlime.

[semi off topic]
Is there one particular application you still use WinCE for? It may not be necessary for you to use WinCE. See for instance my entries in the Jlime homepage Wiki on all the things I use my Jornada for. Chances are you do not need to reboot into WinCE anymore.

thanks for your explanations.

Yes i don't want to use wince.

all my machines work with linux.

I don't known if the backup battery was used to keep time settings.