What is the best way to enable uart?

[yrik]

What is the best way to enable uart?

[JeffyCN]

it's easy to enable uart in kernel dts, something like

&uartx {
status="okay"
};

so you might need to:
1/ use git clone to download the kernel source
2/ modify your kernel dts and git commit it
3/ set the kernel to use this local source(follow the readme.md of this repo's last section)

[yrik]

Thank you for the answer.
I was looking for a way to do it on the level of yocto configuration.
For example, for meta-raspberrypi I can do the following settings in conf/machine/rpi4.conf:

 # prevent using serial for linux output
CMDLINE_SERIAL = ""
 # modify boot commands
CMDLINE:append = "..."
 # modify device overlays 
RPI_KERNEL_DEVICETREE_OVERLAYS:append = "overlays/tc358743-overlay.dtbo"

In ideal case, I would need to have way to directly use https://github.com/radxa/overlays/blob/main/arch/arm64/boot/dts/rockchip/overlays/rk3588-uart3-m1.dts