Re: [gentoo-user] Two RTCs - how to choose in dependence of existence to eth0

[Florian Philipp <lists@binarywings.net>]

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Am 22.08.2013 19:24, schrieb meino.cramer@gmx.de:
> Hi,
> 
> there are two RTC in my system. One is powered by the 
> power of the system itsself and will forget space and
> time if the system is powered off. This is RTC0.
> The second one is powered by a little CR3216. This one
> will not forget the time. This is RTC1
> The system itsself is portable and will be used with and
> without access to the internet (no ethernet, no eth0).
> 
> Surely it is possible to hack together a script which will
> run at boot time to figure out the source of the valid time.
> But this is somehow less elegant and gentoo-ish as it should be.
> 
> I didnt found an application (via eix) which address this "problem".
> 
> What is the recommended way to accomplish this task?
> 
> Thank you very much in advance for any help!
> Best regards,
> mcc
> 

I'm slightly confused. Do you need to use rtc0 at all? You can simply
configure your kernel to use rtc1 with CONFIG_RTC_HCTOSYS_DEVICE.

And for the hwclock init script you could add "-f /dev/rtc1" to the options.

What else is there to do?

Regards,
Florian Philipp


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