When system start, can show system info on oled. Write codes named ‘hello.cpp’ based MikuPi https://github.com/bpiq/MikuPi
gcc -o hello hello.cpp -lMikuDuino
and put command at the end of /etc/rc.local
/home/pi/hello &
then restat BananaPi
thanks to small lu, big ball and home cat. sky god do it by nokia first.