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If you need serial port console access, then following
settings are useful. Add them to local.conf file.
Note that these are only applicaple if you are using
syslinux as your boot loader.

<--snip-->

# This setting ensures that:
# 1) all kernel output is redirected to the serial console
# 2) the kernel output is logged to the text console
SYSLINUX_DEFAULT_CONSOLE = "console=ttyS0 console=tty0"

# Enforce kernel to print all kernel messages to the console
SYSLINUX_KERNEL_ARGS = "ignore_loglevel"

<--snip-->