UCM-iMX95 Yocto Linux: RTC

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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
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