RTC Time Suspended Between Power-Ups

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#1

Hi all,

Just wondering if anyone else has experienced this - I’ve a Beagleboard with RTC battery connected, but when the device is powered down, the clock stops ticking.

So if the time was 31/10/2014 23:58 at power down, it would be the same when the device came back up.

Is this just a small config error or something hardware-related?

Thanks,

Ben

#2

no way to battery backup the BBB RTC
you need to design in an external one

#3

Hi,

You’re referring to the Beaglebone Black though right? This is the XM that I’m talking about.

Thanks,

Ben

#4

You are correct. My bad, 99% of the posts here are BBB related.

#5

Hi,

You’re referring to the Beaglebone Black though right? This is the XM that I’m talking about.

Power management is currently broken and there is an attempt to address this deficiency in this thread:

https://lkml.org/lkml/2014/10/21/631

Regards,
John

#6

That thread looks as though it covers the Beaglebone Black, rather than the XM.

Is the principle the same for both devices, or is it completely different?