On Fri, 2005-12-09 at 19:19 -0500, Nicolas Pitre wrote:
> The RTC count is lost on a hard reset. It survives sleep mode though.
>
> The fact is that PocketPC/WinCE is not meant to be "rebooted" and the
> RTC on the PXA was probably designed with that fact. The normal usage
> pattern is to go into sleep mode all the time.
Which is the aim of the Zaurus kernel although it doesn't help when
developing...
> > could we do something like storing time on system shutdown and
> > restoring it on bootup? That way at least time will be monotonic...
> > Ok, that's userland problem.
>
> I'd say so.
OpenZaurus/OE did have code to try and do this built into its images.
I'm not sure what its status is at the moment.
> > Is there way to reboot without "really" rebooting? That would help at
> > least in my usage case.
>
> You should be able to "soft" reboot which will also preserve the RTC
> count.
Based on past performance, the bootloader (in ROM) will probably
corrupt/reset the RTC but I'd like to be proved wrong.
Russell posted some rough code to linux-arm-kernel recently that allowed
you load a new kernel in a kexec sort of manner and that is probably the
best bet to preserve the RTC. This functionality would be useful on the
Zaurus in general.
Richard
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