is there any way to configure the bpi-r2, that it boots in case of power failure and power comes back without any push at power button? I don’t need a backup battery, I can live with the rare situations of power failure. But it would be nice if I don’t need to be aside the board to switch it on again.
There is another way as well. No need of soldering. You just to have to bring 5V voltage to the microUSB port of R2, as shown here: BPI-R2 boot / power suppy.