UCM-iMX95 Yocto Linux: RTC

There two RTC devices:

• SoC integrated rtc0 that can be used as wake-up source
• On board rtc1 - a low current battery powered time keeper

External - rtc1

• System information:

udevadm info -p /sys/class/rtc/rtc1

• Set the date and write to the RTC:

date -s "12 SEP 2019 10:00:00"

Thu Sep 12 10:00:00 UTC 2019
hwclock --systohc --rtc /dev/rtc1

• Read the RTC time and date:

hwclock --show --rtc /dev/rtc1

2023-06-16 12:01:37.935876+00:00