1.2.3 Chosen

The chosen node is used to define key system parameters required by the operating system or bootloader, such as the default console, boot arguments and the location of the initramfs (initial RAM filesystem).

Example:

chosen {
        bootargs = "console=ttyS0,115200 root=/dev/mmcblk0p2 rw";
        stdout-path = "serial0:115200";
        initrd-start = <0x800000>;
        initrd-end = <0x880000>;
    }; 

In the above example, the serial0:115200n8 string specifies that the standard output should use the serial0 port (as defined in the aliases node), with a configuration of 115200 baud, 8 data bits, no parity and 1 stop bit.