diff --git a/target/linux/mediatek/dts/mt7981b-jcg-q30-ubootmod.dts b/target/linux/mediatek/dts/mt7981b-jcg-q30-ubootmod.dts
index 952f81fe75..b2c1345161 100644
--- a/target/linux/mediatek/dts/mt7981b-jcg-q30-ubootmod.dts
+++ b/target/linux/mediatek/dts/mt7981b-jcg-q30-ubootmod.dts
@@ -25,6 +25,10 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	memory {
+		reg = <0 0x40000000 0 0x10000000>;
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 
diff --git a/target/linux/mediatek/dts/mt7981b-livinet-zr-3020.dtsi b/target/linux/mediatek/dts/mt7981b-livinet-zr-3020.dtsi
index 3bcaba95dc..4a4bc820a6 100644
--- a/target/linux/mediatek/dts/mt7981b-livinet-zr-3020.dtsi
+++ b/target/linux/mediatek/dts/mt7981b-livinet-zr-3020.dtsi
@@ -22,6 +22,10 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	memory {
+		reg = <0 0x40000000 0 0x10000000>;
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 
diff --git a/target/linux/mediatek/dts/mt7981b-qihoo-360t7-ubootmod.dts b/target/linux/mediatek/dts/mt7981b-qihoo-360t7-ubootmod.dts
index 4413164372..f09f11b4e4 100644
--- a/target/linux/mediatek/dts/mt7981b-qihoo-360t7-ubootmod.dts
+++ b/target/linux/mediatek/dts/mt7981b-qihoo-360t7-ubootmod.dts
@@ -22,6 +22,10 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	memory {
+		reg = <0 0x40000000 0 0x10000000>;
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";