Armbian for BPI-M5 and RTC module?

BPI-M5/BPI-M2 Pro/BPI-M2S/BPI-CM4/BPI-CM5
1

Armbian 23.02.2 (22.11.3 as well) does not detect RTC module DS3231 connected by I2C. Raspios can find it but does not remember the /dev/rtc0 device after reboot.

2

needs to be developed https://docs.armbian.com/User-Guide_FAQ/#why-does-hardware-feature-xy-work-in-old-kernel-but-not-in-more-recent-one