u-boot/tools/binman/test/44_x86_optional_ucode.dts

/dts-v1/;

/ {
	#address-cells = <1>;
	#size-cells = <1>;

	binman {
		sort-by-pos;
		end-at-4gb;
		size = <0x200>;
		u-boot-with-ucode-ptr {
			optional-ucode;
		};

		u-boot-dtb-with-ucode {
		};

		u-boot-ucode {
		};
	};

	microcode {
		update@0 {
			data = <0x12345678 0x12345679>;
		};
		update@1 {
			data = <0xabcd0000 0x78235609>;
		};
	};
};