I have seen many tutorials about connecting real time clock hardware on Orange Pi and Raspberry Pi. What i didn't like was removing of fake-hwclock service, because I want that RTC works when it is connected, and fake-hwclock when RTC is not connected. Therefore, I changed /sbin/fake-hwclock script to work in this way.   So, here is how to do this, tested on OrangePi+2E, Armbian Ubuntu legacy kernel: Purchase cheap DS3231 module on eBay (cca. $1) like this one: http://www.eb