diff --git a/plat/st/stm32mp1/sp_min/sp_min_setup.c b/plat/st/stm32mp1/sp_min/sp_min_setup.c
index e1799ed..1f96239 100644
--- a/plat/st/stm32mp1/sp_min/sp_min_setup.c
+++ b/plat/st/stm32mp1/sp_min/sp_min_setup.c
@@ -77,7 +77,25 @@
 	return next_image_info;
 }
 
+CASSERT((STM32MP_SEC_SYSRAM_BASE == STM32MP_SYSRAM_BASE) &&
+	((STM32MP_SEC_SYSRAM_BASE + STM32MP_SEC_SYSRAM_SIZE) <=
+	 (STM32MP_SYSRAM_BASE + STM32MP_SYSRAM_SIZE)),
+	assert_secure_sysram_fits_at_begining_of_sysram);
+
+#ifdef STM32MP_NS_SYSRAM_BASE
+CASSERT((STM32MP_NS_SYSRAM_BASE >= STM32MP_SEC_SYSRAM_BASE) &&
+	((STM32MP_NS_SYSRAM_BASE + STM32MP_NS_SYSRAM_SIZE) ==
+	 (STM32MP_SYSRAM_BASE + STM32MP_SYSRAM_SIZE)),
+	assert_non_secure_sysram_fits_at_end_of_sysram);
+
+CASSERT((STM32MP_NS_SYSRAM_BASE & (PAGE_SIZE_4KB - U(1))) == 0U,
+	assert_non_secure_sysram_base_is_4kbyte_aligned);
+
+#define TZMA1_SECURE_RANGE \
+	(((STM32MP_NS_SYSRAM_BASE - STM32MP_SYSRAM_BASE) >> FOUR_KB_SHIFT) - 1U)
+#else
 #define TZMA1_SECURE_RANGE		STM32MP1_ETZPC_TZMA_ALL_SECURE
+#endif /* STM32MP_NS_SYSRAM_BASE */
 #define TZMA0_SECURE_RANGE		STM32MP1_ETZPC_TZMA_ALL_SECURE
 
 static void stm32mp1_etzpc_early_setup(void)
diff --git a/plat/st/stm32mp1/stm32mp1_def.h b/plat/st/stm32mp1/stm32mp1_def.h
index 0a12b6e..4fae2d7 100644
--- a/plat/st/stm32mp1/stm32mp1_def.h
+++ b/plat/st/stm32mp1/stm32mp1_def.h
@@ -56,6 +56,15 @@
 #define STM32MP_SYSRAM_BASE		U(0x2FFC0000)
 #define STM32MP_SYSRAM_SIZE		U(0x00040000)
 
+#define STM32MP_NS_SYSRAM_SIZE		PAGE_SIZE
+#define STM32MP_NS_SYSRAM_BASE		(STM32MP_SYSRAM_BASE + \
+					 STM32MP_SYSRAM_SIZE - \
+					 STM32MP_NS_SYSRAM_SIZE)
+
+#define STM32MP_SEC_SYSRAM_BASE		STM32MP_SYSRAM_BASE
+#define STM32MP_SEC_SYSRAM_SIZE		(STM32MP_SYSRAM_SIZE - \
+					 STM32MP_NS_SYSRAM_SIZE)
+
 /* DDR configuration */
 #define STM32MP_DDR_BASE		U(0xC0000000)
 #define STM32MP_DDR_MAX_SIZE		U(0x40000000)	/* Max 1GB */
@@ -81,18 +90,18 @@
 /* 256 Octets reserved for header */
 #define STM32MP_HEADER_SIZE		U(0x00000100)
 
-#define STM32MP_BINARY_BASE		(STM32MP_SYSRAM_BASE +		\
+#define STM32MP_BINARY_BASE		(STM32MP_SEC_SYSRAM_BASE +	\
 					 STM32MP_PARAM_LOAD_SIZE +	\
 					 STM32MP_HEADER_SIZE)
 
-#define STM32MP_BINARY_SIZE		(STM32MP_SYSRAM_SIZE -		\
+#define STM32MP_BINARY_SIZE		(STM32MP_SEC_SYSRAM_SIZE -	\
 					 (STM32MP_PARAM_LOAD_SIZE +	\
 					  STM32MP_HEADER_SIZE))
 
 #ifdef AARCH32_SP_OPTEE
 #define STM32MP_BL32_SIZE		U(0)
 
-#define STM32MP_OPTEE_BASE		STM32MP_SYSRAM_BASE
+#define STM32MP_OPTEE_BASE		STM32MP_SEC_SYSRAM_BASE
 
 #define STM32MP_OPTEE_SIZE		(STM32MP_DTB_BASE -  \
 					 STM32MP_OPTEE_BASE)
@@ -104,8 +113,8 @@
 #endif
 #endif
 
-#define STM32MP_BL32_BASE		(STM32MP_SYSRAM_BASE + \
-					 STM32MP_SYSRAM_SIZE - \
+#define STM32MP_BL32_BASE		(STM32MP_SEC_SYSRAM_BASE + \
+					 STM32MP_SEC_SYSRAM_SIZE - \
 					 STM32MP_BL32_SIZE)
 
 #ifdef AARCH32_SP_OPTEE
diff --git a/plat/st/stm32mp1/stm32mp1_private.c b/plat/st/stm32mp1/stm32mp1_private.c
index 779228d..fd60db2 100644
--- a/plat/st/stm32mp1/stm32mp1_private.c
+++ b/plat/st/stm32mp1/stm32mp1_private.c
@@ -30,13 +30,30 @@
 					 BOARD_ID_REVISION_SHIFT)
 #define BOARD_ID2BOM(_id)		((_id) & BOARD_ID_BOM_MASK)
 
-#define MAP_SRAM	MAP_REGION_FLAT(STM32MP_SYSRAM_BASE, \
+#if defined(IMAGE_BL2)
+#define MAP_SEC_SYSRAM	MAP_REGION_FLAT(STM32MP_SYSRAM_BASE, \
 					STM32MP_SYSRAM_SIZE, \
 					MT_MEMORY | \
 					MT_RW | \
 					MT_SECURE | \
 					MT_EXECUTE_NEVER)
+#elif defined(IMAGE_BL32)
+#define MAP_SEC_SYSRAM	MAP_REGION_FLAT(STM32MP_SEC_SYSRAM_BASE, \
+					STM32MP_SEC_SYSRAM_SIZE, \
+					MT_MEMORY | \
+					MT_RW | \
+					MT_SECURE | \
+					MT_EXECUTE_NEVER)
 
+/* Non-secure SYSRAM is used a uncached memory for SCMI message transfer */
+#define MAP_NS_SYSRAM	MAP_REGION_FLAT(STM32MP_NS_SYSRAM_BASE, \
+					STM32MP_NS_SYSRAM_SIZE, \
+					MT_DEVICE | \
+					MT_RW | \
+					MT_NS | \
+					MT_EXECUTE_NEVER)
+#endif
+
 #define MAP_DEVICE1	MAP_REGION_FLAT(STM32MP1_DEVICE1_BASE, \
 					STM32MP1_DEVICE1_SIZE, \
 					MT_DEVICE | \
@@ -53,7 +70,7 @@
 
 #if defined(IMAGE_BL2)
 static const mmap_region_t stm32mp1_mmap[] = {
-	MAP_SRAM,
+	MAP_SEC_SYSRAM,
 	MAP_DEVICE1,
 	MAP_DEVICE2,
 	{0}
@@ -61,7 +78,8 @@
 #endif
 #if defined(IMAGE_BL32)
 static const mmap_region_t stm32mp1_mmap[] = {
-	MAP_SRAM,
+	MAP_SEC_SYSRAM,
+	MAP_NS_SYSRAM,
 	MAP_DEVICE1,
 	MAP_DEVICE2,
 	{0}