BPI M2 Zero with Raspbian buster OS and RTC module

Question: For the Banana Pi M2 Zero, with Raspbian OS, buster with kernel 4.19.129-sunxi. installed, where can I find the uEnv.txt file? The reason why I ask this is that I would like to install a RTC module ds3231 or ds1307. I know how to make this to work on a RPI zero but it doesn’t work like that on a BPI M2 zero. If I add the i2c lines to /boot/config.txt, and try to activate the i2c interface at raspi-config, the system comes back with an error: Unknown parameter ‘i2c_arm’

AI sites do suggest to setup the uEnv.txt file correctly, but I can’t find that file. I defantly need help here. The below file is suggested by AI sites: boot/bananapi/bpi-m2z/linux/uEnv.txt

with the following text

overlay_prefix=bpi-m2z overlays=i2c0 i2c1 param_i2c1_speed = 100000

I solved the RTC problem. The Real Time Clock is working. i2c works as a sharm. How? Just try hard :slight_smile: