RTC for iMX8MP-SOM-EVB-IND

[ilario]

On A64-OLinuXino there was an exposed contact for adding an external battery powering the Real Time Clock present on the board, as explained here, and it was very useful.

Is there something like this for the iMX8MP-SOM-EVB-IND?

Maybe using a UEXT module like the MOD-RTC2? But then, how should one use it? Should one write a Systemd unit probing the RTC and updating the system time? Is there something like that ready to use?

[LubOlimex]

I have to check about built in RTC of iMX8, but using external module like MOD-RTC2 is not very hard as long the I2C communication is properly working. MOD-RTC2 uses a battery to keep the time and I2C for communication and when board get powered on you update system clock from the I2C, there is a demo for A20 board take a look:

https://github.com/OLIMEX/OLINUXINO/tree/master/SOFTWARE/A20/A20-OLinuXino-Micro%20with%20MOD-RTC2