fml13v01-buildroot/board/freescale/imx7dsdb/rootfs_overlay/boot/extlinux/extlinux.conf

Label imx7d-sabresd-buildroot
  kernel /boot/zImage
  devicetree /boot/imx7d-sdb.dtb
  append root=PARTUUID=${uuid} rootwait rw console=${console},${baudrate}