meta-raspberrypi/recipes-bsp/rpi-u-boot-scr/files/boot.cmd.in

fdt addr ${fdt_addr} && fdt get value bootargs /chosen bootargs
fatload mmc 0:1 ${kernel_addr_r} @@KERNEL_IMAGETYPE@@
@@KERNEL_BOOTCMD@@ ${kernel_addr_r} - ${fdt_addr}