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Getting DS3231 to work on a Raspberry Pi 4


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I'm trying to get to the point where I can read time from the DS3231 RTC module on a Raspberry Pi 4. From what I understand, I first need to activate i2c bus, then load the kernel module that would work with the clock itself. 

So far i2cdetect tool fails to detect anything. There are no i2c-* devices in /dev either.


I've read about "Hardware" option in armbian-config, but it's not showing up in the menu. I've also read that it's a matter of adding a device tree overlay. Does that apply for RPI4? The folder structure in /boot seems different from what documentation and several threads describe for other boards. 


What would be the steps for activating i2c bus on RPI4?

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