diff --git a/fdts/stm32mp157a-dk1.dts b/fdts/stm32mp157a-dk1.dts
index 9016b0f..b17d501 100644
--- a/fdts/stm32mp157a-dk1.dts
+++ b/fdts/stm32mp157a-dk1.dts
@@ -15,6 +15,8 @@
 
 	aliases {
 		serial0 = &uart4;
+		serial1 = &usart3;
+		serial2 = &uart7;
 	};
 
 	chosen {
@@ -176,6 +178,18 @@
 	status = "okay";
 };
 
+&uart7 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart7_pins_a>;
+	status = "disabled";
+};
+
+&usart3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usart3_pins_b>;
+	status = "disabled";
+};
+
 /* ATF Specific */
 #include <dt-bindings/clock/stm32mp1-clksrc.h>
 #include "stm32mp15-ddr3-1x4Gb-1066-binG.dtsi"
@@ -287,3 +301,11 @@
 		cfg = < 3 98 5 7 7 PQR(1,1,1) >;
 	};
 };
+
+&bsec {
+	board_id: board_id@ec {
+		reg = <0xec 0x4>;
+		status = "okay";
+		secure-status = "okay";
+	};
+};