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cmdline.txt

# 1. Kernel messages are output via the UART pins.
# serial0 is magically replaced with ttyAMA0 or ttyS0 depending on the
# serial port configuration in config.txt.
# 2. To output kernel messages over HDMI, add
# "console=tty1 fbcon=scrollback:1024k consoleblank=0"
# https://www.raspberrypi.org/documentation/configuration/cmdline-txt.md
# 3. If you're experimenting with kernel commandline parameters, it's easist
# to modify this file on the MicroSD card via your development computer. To
# make changes permanent, you'll need to override the fwup.conf.
root=/dev/mmcblk0p2 rootwait console=serial0,115200 quiet