Some questions about 40-pin expansion header

[witchol]

Hello everyone！
The official document defines 40-pin as follows：

So I have some dumb questions about ROCK 5B 's 40-pin expansion header.

• These pins have many functions, But what is the default function of each pin
• If I don’t want to use these default functions, how can I change the function of each pin
  Thanks a lot!

[dominik]

These pins have many functions, But what is the default function of each pin

Function 1

If I don’t want to use these default functions, how can I change the function of each pin

Like on almost every sbc - by loading device tree overlays files.

[witchol]

Thank u very much！