Trouble with rtc

Support for the Uninterruptible Power Supply
with Peripherals and I2C control Interface
Raspberry Pi® B+, A+, B, and A
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Posts: 15
Joined: Mon Apr 11, 2016 8:49 pm

Trouble with rtc

Post by treii28 » Sun Apr 23, 2017 7:55 pm

Are there any tricks to checking for problems with the RTC? I have the necessary entry in /boot/config.txt to set the dtoverlay for ds1307 but when I check the dmesg after a reboot, I see a whole slew of

Code: Select all

rtc-ds1307 1-0068: SET TIME!
errors followed by a single

Code: Select all

rtc-ds1307: probe of 1-0068 failed with error -5
I haven't powered up this box in a while and first did a full software and firmware update on my a+ before checking the status of the pico, when I noticed the hwclock set line in rc.local was throwing an error that it couldn't find a known method to access the clock.

Posts: 42
Joined: Sat Aug 15, 2015 12:14 pm

Re: Trouble with rtc

Post by Eppo » Thu Jun 08, 2017 3:43 pm

Your problem with RTC is most probably related to the i2c communication issues between the raspberry pi and the ups_pico module that surfaced when the kernel version was bumped from 4.4.50 yo 4.9.xx. It will hopefully be resolved as soon as the new firmware for the ups_pico HV1.0 and HV1.1 modules will be released.

also see: ... =12&t=6233
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