1

I know the procedure to enable an external RTC, but I just wonder which are the available supported chip (in config.txt and to use with modprobe).

Where can I find such a list?

3

Read /boot/overlays/README particularly the i2c-rtc section.

DO NOT use modprobe use Device Tree!

Pick any of the listed modules.

I recommend ds3231 which is a good performer and works from 3.3V, although many of the others work well.

  • I also recommend DS3231, it (almost) never misses a beat. The DS1307 has been known to drift many minutes, even hours, every month. – user2497 Sep 26 '17 at 8:59

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