u-boot/tools/binman/test/067_fmap.dts

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

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

	binman {
		section@0 {
			read-only;
			name-prefix = "ro-";
			size = <0x10>;
			pad-byte = <0x21>;
			preserve;

			u-boot {
			};
		};
		section@1 {
			name-prefix = "rw-";
			size = <0x10>;
			pad-byte = <0x61>;

			u-boot {
			};
		};
		fmap {
		};
	};
};