u-boot/doc/uImage.FIT/multi-with-fpga.its

/*
 * U-Boot uImage source file with multiple kernels, ramdisks and FDT blobs
 * This example makes use of the 'loadables' field
 */

/dts-v1/;

/ {
	description = "Configuration to load fpga before Kernel";
	#address-cells = <1>;

	images {
		fdt-1 {
			description = "zc706";
			data = /incbin/("/tftpboot/devicetree.dtb");
			type = "flat_dt";
			arch = "arm";
			compression = "none";
			load = <0x10000000>;
			hash-1 {
				algo = "md5";
			};
		};

		fpga {
			description = "FPGA";
			data = /incbin/("/tftpboot/download.bit");
			type = "fpga";
			arch = "arm";
			compression = "none";
			load = <0x30000000>;
			compatible = "u-boot,fpga-legacy"
			hash-1 {
				algo = "md5";
			};
		};

		linux_kernel {
			description = "Linux";
			data = /incbin/("/tftpboot/zImage");
			type = "kernel";
			arch = "arm";
			os = "linux";
			compression = "none";
			load = <0x8000>;
			entry = <0x8000>;
			hash-1 {
				algo = "md5";
			};
		};
	};

	configurations {
		default = "config-2";
		config-1 {
			description = "Linux";
			kernel = "linux_kernel";
			fdt = "fdt-1";
		};

		config-2 {
			description = "Linux with fpga";
			kernel = "linux_kernel";
			fdt = "fdt-1";
			loadables = "fpga";
		};
	};
};