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you need to read the subject , instruction is english ! https://forum.recalbox.com/topic/15602/mapping-gpio-poru-game-hat/3 you need to download link for gpio driver and upload on recalbox
Hey, here's a step by step tutorial: https://forum.recalbox.com/topic/15602/mapping-gpio-poru-game-hat/12
The "mk_arcade_joystick_rpi.ko" file can be downloaded further up in the thread.
Thanks again to the people in the thread.