I managed to compile Nodejs for my Luckfox Pico Max, using the procedure described here:

https://stackoverflow.com/questions/75223634/nodejs-is-not-building-in-buildroot-because-va-list-has-not-been-declared

In short, there are just two files which need simple edits:

in sysdrv/source/buildroot ...

Thank you! It works when I put rts and cts pins into correct bank using iomux command. Now I will try to find why
pinctrl in the device tree isn't working as expected. Hopefully, the example with wireless module control will help me.

Hello,

I have a Luckfox Pico MAX. Serial communication works on all UARTs, when using only RX and TX pins, and no flow control.

UART0, UART1, and UART4 have available RTS and CTS pins, and I tried to use hardware flow control with them; however, without success.

In sysdrv/source/kernel/arch/arm ...

Hello,

According to documentation, LuckFox Pico Pro/Max has 5 serial ports (one of them - UART2 is always used as debug console). I want to use the remaining 4 ports, but only 3 shows up (UART1, UART3, UART4). How to enable UART0?

I tried luckfox-config, and also tried to manually edit /etc ...