diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-m4.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-m4.dts
index 60358ab8c7df..f8275574c7bc 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-m4.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-m4.dts
@@ -46,6 +46,17 @@ vcc5v0_usb2: vcc5v0-usb2 {
 		regulator-boot-on;
 		vin-supply = <&vcc5v0_sys>;
 	};
+
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+		secure_ddr: secure_ddr@8000000 {
+			reg = <0 0x8000000 0 0x2000000>;
+			alignment = <0x1000>;
+			no-map;
+		};
+	};
 };
 
 &vcc3v3_sys {