http://www.techjawab.com/2013/06/how-to-setup-mount-auto-mount-usb-hard.html
- Call it the mount “roms”, and soft link it into ~/RetroPie after removing the rome directory there.
sudo chown pi /opt/retropie/configs/all/retroarch.cfg cd /opt/retropie/emulators/RetroArch/installdir/bin sudo ./retroarch-joyconfig -j 1 >> /opt/retropie/configs/all/retroarch.cfg
http://blog.petrockblock.com/forums/topic/ps3-bluetooth-controller-correct-method-for-retropie-2-3/
arm_freq=1000
core_freq=500
sdram_freq=500
over_voltage=6