diff --git a/fdts/stm32mp157a-dk1.dts b/fdts/stm32mp157a-dk1.dts
index cf0fe2889..68188be92 100644
--- a/fdts/stm32mp157a-dk1.dts
+++ b/fdts/stm32mp157a-dk1.dts
@@ -173,6 +173,7 @@
 /* ATF Specific */
 #include <dt-bindings/clock/stm32mp1-clksrc.h>
 #include "stm32mp15-ddr3-1x4Gb-1066-binG.dtsi"
+#include "stm32mp157c-security.dtsi"
 
 / {
 	aliases {
@@ -188,14 +189,6 @@
 		gpio25 = &gpioz;
 		i2c3 = &i2c4;
 	};
-
-	soc {
-		stgen: stgen@5C008000 {
-			compatible = "st,stm32-stgen";
-			reg = <0x5C008000 0x1000>;
-			status = "okay";
-		};
-	};
 };
 
 /* CLOCK init */
diff --git a/fdts/stm32mp157c-ed1.dts b/fdts/stm32mp157c-ed1.dts
index 0fadffbd6..820e4131e 100644
--- a/fdts/stm32mp157c-ed1.dts
+++ b/fdts/stm32mp157c-ed1.dts
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /*
- * Copyright (C) STMicroelectronics 2017 - All Rights Reserved
+ * Copyright (C) STMicroelectronics 2017-2019 - All Rights Reserved
  * Author: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
  */
 /dts-v1/;
@@ -191,6 +191,7 @@
 /* ATF Specific */
 #include <dt-bindings/clock/stm32mp1-clksrc.h>
 #include "stm32mp15-ddr3-2x4Gb-1066-binG.dtsi"
+#include "stm32mp157c-security.dtsi"
 
 / {
 	aliases {
@@ -208,14 +209,6 @@
 		gpio25 = &gpioz;
 		i2c3 = &i2c4;
 	};
-
-	soc {
-		stgen: stgen@5C008000 {
-			compatible = "st,stm32-stgen";
-			reg = <0x5C008000 0x1000>;
-			status = "okay";
-		};
-	};
 };
 
 /* CLOCK init */
diff --git a/fdts/stm32mp157c-security.dtsi b/fdts/stm32mp157c-security.dtsi
new file mode 100644
index 000000000..fb04e7ddd
--- /dev/null
+++ b/fdts/stm32mp157c-security.dtsi
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2017-2019, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+
+/ {
+	soc {
+		stgen: stgen@5C008000 {
+			compatible = "st,stm32-stgen";
+			reg = <0x5C008000 0x1000>;
+			status = "okay";
+		};
+	};
+};
+
+&bsec {
+	mac_addr: mac_addr@e4 {
+		reg = <0xe4 0x6>;
+		status = "okay";
+		secure-status = "okay";
+	};
+	/* Spare field to align on 32-bit OTP granularity  */
+	spare_ns_ea: spare_ns_ea@ea {
+		reg = <0xea 0x2>;
+		status = "okay";
+		secure-status = "okay";
+	};
+	board_id: board_id@ec {
+		reg = <0xec 0x4>;
+		status = "okay";
+		secure-status = "okay";
+	};
+};