u-boot-brain/tools/binman/test/088_expand_size.dts

// SPDX-License-Identifier: GPL-2.0+
/dts-v1/;

/ {
	binman {
		size = <40>;
		fill {
			expand-size;
			fill-byte = [61];
			size = <0>;
		};
		u-boot {
			offset = <8>;
		};
		section {
			expand-size;
			pad-byte = <0x62>;
			intel-mrc {
			};
		};
		u-boot2 {
			type = "u-boot";
			offset = <16>;
		};
		section2 {
			type = "section";
			fill {
				expand-size;
				fill-byte = [63];
				size = <0>;
			};
			u-boot {
				offset = <8>;
			};
		};
		fill2 {
			type = "fill";
			expand-size;
			fill-byte = [64];
			size = <0>;
		};
	};
};