How to get into AML-S905X-CC BIOS settings?

[angus]

Neither of those things are trivial.

I have no Idea how to hide the boot messages, and I personally wouldn’t, because if you have boot problems in the future they will be that much harder to debug.

As far as writing overlays that is a HUGE topic. It’s not feasible to write a complete how-to in a forum post. What specifically are you looking to do?

Info on applying existing Device Tree Overlays:

Libre Computer Wiring Tool

To install via apt: sudo apt update sudo apt install libretech-gpio libretech-dtoverlay libretech-gpio To get a list of headers for your board: lgpio headers To get a list of the header pins for a header: lgpio header HEADER For getting the information for a pin number on the main GPIO header of the board: lgpio info PIN# For getting the information for a pin number on a specific header of the board: lgpio info HEADER PIN# For getting the libgpiod chip and line number for a pin on th…

Here is a good resource for learning about the device tree by Thomas Petazzoni of Bootlin. He doesn’t get into overlays, but you kind of have to understand this first (EDIT: prepare yourself for some 0xBADCAFE):

Device Tree 101 10:00 AM UTC+1 session