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

[Rockblepotato]

How to get into AML-S905X-CC BIOS settings??? Can anyone help?? Thanks.

[librecomputer]

There is no BIOS. Only device tree (hardware description) handed to Linux which you can override via overlays. Then the Linux drivers determine how to use those overlays to drive the hardware.

[Rockblepotato]

Thanks for the reply! But can you please redirect me to how can I override via overlays. I’m new to this system. Also please tell me how can I hide this message displayed at the time of start(please refer the screen shot I have attached). Thank You

[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

[librecomputer]

That cannot be overridden through device tree. You need to compile your own bootloader and learn u-boot.