sample-extlinux.conf

TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options
# Sample extlinux.conf file for booting from USB
# You will need to set the root environment variable to match your system
#
# You can set the root to various levels of specificity
# If you have multiple USB storage devices, the PARTUUID approach is very useful
# PARTUUID is the PARTUUID of the USB device; most exact - recommended
# LABELNAME is a little more specific; root=LABEL=jetson_drive
# /dev/sda1 is the most general; root=/dev/sda1
# Note: The UUID options seems to have some issues on the Jetson
LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
      INITRD /boot/initrd
      APPEND ${cbootargs} quiet root=PARTUUID=32a76e0a-9aa7-4744-9954-dfe6f353c6a7 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 

# When testing a custom kernel, it is recommended that you create a backup of
# the original kernel and add a new entry to this file so that the device can
# fallback to the original kernel. To do this:
#
# 1, Make a backup of the original kernel
#      sudo cp /boot/Image /boot/Image.backup
#
# 2, Copy your custom kernel into /boot/Image
#
# 3, Uncomment below menu setting lines for the original kernel
#
# 4, Reboot

LABEL sdcard
      MENU LABEL primary kernel
      LINUX /boot/Image
      INITRD /boot/initrd
      APPEND ${cbootargs} quiet root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0