Autostart program like minicom at console at boot

Install minicom

sudo apt-get install minicom

setup your system to auto ;login into a commandline session
[use sudo raspi-config]

then at the end of .bashrc put in

if [ $(tty) == /dev/tty1 ]; then
   minicom -s  ##change this to be the thing you want or even a script [full path to]

then reboot your rpi