Hi Balbes150,
I've been following this topic, and others related to your Linux development efforts on Amlogic platforms for a few weeks now.
I'm curious about the function of the Fn button inside the headphone jack. When that button is held, does the device change its boot order, and use the u-boot installed on the SD card, or does it simply change the stock u-boot's environment?
Is it possible to create an SD card with a custom u-boot that's bootable in an unmodified (no multiboot) TV box like the Mini M8S II simply by holding the recovery/Fn button?