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I have a DS3231 attached and can read / write time successfully.

i2cdetect shows it accessible on i2c address 0x68 as you'd expect.

None of the advice about configuring an i2c-rtc driver in /boot/config.txt has any effect.

dmesg |grep 3231 returns nothing.

dmesg |grep rtc likewise, except for a message: Unknown kernel command line parameters "fixrtc splash", will be passed to user space

I note /boot/config-5.15.0-1015-raspi (the most recent of the config files) has mention of the DS1307, but there's no mention of the DS3231 in it - i.e.:

CONFIG_RTC_DRV_DS1307=m  
CONFIG_RTC_DRV_DS1307_CENTURY=y

Any clues or diagnostics would be welcome.

stonebreaker
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  • Are you running Ubuntu or Raspberry Pi OS? – David Sep 26 '22 at 12:44
  • Ubuntu 22.04 here, @David Just spotted an amazing guide that seems to solve this: https://forums.raspberrypi.com/viewtopic.php?t=330201#p1977333 – stonebreaker Sep 26 '22 at 13:15
  • Seconded - I also had difficulty getting a DS3231 working with Ubuntu 22.04 on a Raspberry Pi 4B and the link mentioned by stonebreaker worked (https://forums.raspberrypi.com/viewtopic.php?t=330201#p1977333) – Marinna Martini Sep 28 '22 at 13:44

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