diff --git a/fdts/stm32mp13-fw-config.dtsi b/fdts/stm32mp13-fw-config.dtsi
index dc8ca1b43..28f7086c3 100644
--- a/fdts/stm32mp13-fw-config.dtsi
+++ b/fdts/stm32mp13-fw-config.dtsi
@@ -13,11 +13,9 @@
 #endif
 
 #define DDR_NS_BASE	STM32MP_DDR_BASE
-#define DDR_SEC_SIZE	0x01e00000
+#define DDR_SEC_SIZE	0x02000000
 #define DDR_SEC_BASE	(STM32MP_DDR_BASE + (DDR_SIZE - DDR_SEC_SIZE))
-#define DDR_SHARE_SIZE	0x00200000
-#define DDR_SHARE_BASE	(DDR_SEC_BASE - DDR_SHARE_SIZE)
-#define DDR_NS_SIZE	(DDR_SHARE_BASE - DDR_NS_BASE)
+#define DDR_NS_SIZE	(DDR_SEC_BASE - DDR_NS_BASE)
 
 /dts-v1/;
 
@@ -48,8 +46,6 @@
 		compatible = "st,mem-firewall";
 		memory-ranges = <
 			DDR_NS_BASE DDR_NS_SIZE TZC_REGION_S_NONE TZC_REGION_NSEC_ALL_ACCESS_RDWR
-			DDR_SHARE_BASE DDR_SHARE_SIZE TZC_REGION_S_NONE
-			TZC_REGION_ACCESS_RDWR(STM32MP1_TZC_A7_ID)
 			DDR_SEC_BASE DDR_SEC_SIZE TZC_REGION_S_RDWR 0>;
 	};
 };