Orin nano wont detect arduino /dev/ttyUSB* or /dev/ttyACM*

Appreciate your detailed explanation @linuxdev. From the official documentation on kernel customisation, I noticed the following command:

export CROSS_COMPILE=/bin/aarch64-buildroot-linux-gnu

I am wondering what does toolchain-path refer to? Could you please clarify on this? Also, how can I build the tegra_defconfig target as mentioned by you in the post Enable CONFIG_USB_SERIAL_PL2303 on kernel - #12 by linuxdev Specifically, what is the command that I have to execute to perform the build task? Thanks in advance.