As i play catch up its non stop with Switch releases:
@DarkMelman from GBATemp reports he been able to get the payloads launching for TegraRCM from a Raspberry Pi 3, and has shared his 'working script' for it on GITHub, check it out below:
udev_rule_fusee_gelee_pi3
This scrip creates a script file to run fusee gelee after connecting the switch in RCM mode to a Raspberry Pi 3