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To support Xbox controllers on the RetroPie image for Raspberry Pi 2 units please use the following. This may work for other controllers, but I have no way to test.

NOTE: Use ls /dev/input/ to make sure the “input_player#_joypad_index = ” values are correct. For most they should be js0, js1, etc. You could have something weird like js1, 2, etc at which point you will need to adjust the player1 from 0 to 1 and then so on and so forth.

Edit the /opt/retropie/configs/all/retroarch.cfg file

Add the following to the end of the file

# Start
input_joypad_driver = linuxraw
input_player1_joypad_index = "0"
input_player1_up_axis = "-1"
input_player1_down_axis = "+1"
input_player1_left_axis = "-0"
input_player1_right_axis = "+0"
input_player1_a_btn = "0"
input_player1_b_btn = "1"
input_player1_x_btn = "2"
input_player1_y_btn = "3"
input_player1_select_btn = "6"
input_player1_start_btn = "7"
input_player2_joypad_index = "1"
input_player2_up_axis = "-1"
input_player2_down_axis = "+1"
input_player2_left_axis = "-0"
input_player2_right_axis = "+0"
input_player2_a_btn = "0"
input_player2_b_btn = "1"
input_player2_x_btn = "2"
input_player2_y_btn = "3"
input_player2_select_btn = "6"
input_player2_start_btn = "7"
input_player3_joypad_index = "2"
input_player3_up_axis = "-1"
input_player3_down_axis = "+1"
input_player3_left_axis = "-0"
input_player3_right_axis = "+0"
input_player3_a_btn = "0"
input_player3_b_btn = "1"
input_player3_x_btn = "2"
input_player3_y_btn = "3"
input_player3_select_btn = "6"
input_player3_start_btn = "7"
input_player4_joypad_index = "3"
input_player4_up_axis = "-1"
input_player4_down_axis = "+1"
input_player4_left_axis = "-0"
input_player4_right_axis = "+0"
input_player4_a_btn = "0"
input_player4_b_btn = "1"
input_player4_x_btn = "2"
input_player4_y_btn = "3"
input_player4_select_btn = "6"
input_player4_start_btn = "7"
input_exit_emulator_btn = "4"
input_menu_toggle_btn = "5"
# End

NOTE: I used http://howchoo.com/g/n2qyzdk5zdm/build-your-own-raspberry-pi-retro-gaming-rig to figure out how to build my RetroPie, though N64 isn’t working yet.