I2C of RK3328CC

Hello, does anyone know how to enable the interface of I2c of RK3328CC ?
The firmware I used is Raw Firmware ubuntu16.04 provided by Firefly official. I have seen the solution in the site following: https://forum.armbian.com/topic/8856-solved-how-to-add-an-external-rtc-module-to-rock64-board/, while it doesn’t work. It always tell me “Your kernel does not support CONFIG OF OVERLAY”, and my folder /sys/kernel/config is vide.
Need I compile linux firmware by myself ? Thanks a lot :smiley:

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