u-boot-brain/arch/arm/dts/sunxi-u-boot.dtsi

#include <config.h>

/ {
	aliases {
		mmc1 = &mmc2;
	};

	binman {
		filename = "u-boot-sunxi-with-spl.bin";
		pad-byte = <0xff>;
		blob {
			filename = "spl/sunxi-spl.bin";
		};
		u-boot-img {
			offset = <CONFIG_SPL_PAD_TO>;
		};
	};
};