HowTo: GPIO access, I2C, Kernel Building
by p3dt
from: https://forum.clockworkpi.com/t/howto-gpio-access-i2c-kernel-building/5036
Hi, it’s Paul again
Intro
I found some time over the last days to play with the GPIOs and I2C. And got all of them to work, as well as I2C support:

WARNING! This program can confuse your I2C bus