U-boot cmdline

The Linux kernel cmdline can be customized by modifying the cmdline_append variable. If new arguments are added the existing value should also be included.

env set cmdline_append console=ttymxc0,115200 init=/sbin/init quiet
env save

You can also change the kernel command line from the onboard Linux. From the board's shell prompt run:

apt-get update && apt-get install u-boot-tools -y
echo "env set cmdline_append console=ttymxc0,115200 init=/sbin/init quiet" > /boot/boot.scr
mkimage -A arm -T script -C none -n 'tsimx6 boot script' -d /boot/boot.scr /boot/boot.ub

The boot.scr includes the plain text commands to be run in u-boot on startup. The mkimage tool adds a checksum and header to this file which can be loaded by u-boot. The ub file should not be edited directly.