diff --git a/plat/st/stm32mp1/bl2_plat_setup.c b/plat/st/stm32mp1/bl2_plat_setup.c
index bd3903d..24ecb32 100644
--- a/plat/st/stm32mp1/bl2_plat_setup.c
+++ b/plat/st/stm32mp1/bl2_plat_setup.c
@@ -440,8 +440,7 @@
 				paged_mem_params = get_bl_mem_params_node(BL32_EXTRA2_IMAGE_ID);
 				if (paged_mem_params != NULL) {
 					paged_mem_params->image_info.image_base = STM32MP_DDR_BASE +
-						(dt_get_ddr_size() - STM32MP_DDR_S_SIZE -
-						 STM32MP_DDR_SHMEM_SIZE);
+						(dt_get_ddr_size() - STM32MP_DDR_S_SIZE);
 					paged_mem_params->image_info.image_max_size =
 						STM32MP_DDR_S_SIZE;
 				}
diff --git a/plat/st/stm32mp1/platform.mk b/plat/st/stm32mp1/platform.mk
index ddc5289..c411edf 100644
--- a/plat/st/stm32mp1/platform.mk
+++ b/plat/st/stm32mp1/platform.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2015-2024, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -60,11 +60,6 @@
 # STM32 image header version v1.0
 STM32_HEADER_VERSION_MAJOR:=	1
 STM32_HEADER_VERSION_MINOR:=	0
-
-# Add OP-TEE reserved shared memory area in mapping
-STM32MP15_OPTEE_RSV_SHM	:=	0
-$(eval $(call add_defines,STM32MP15_OPTEE_RSV_SHM))
-
 STM32MP_CRYPTO_ROM_LIB :=	1
 
 # Decryption support
diff --git a/plat/st/stm32mp1/stm32mp1_fip_def.h b/plat/st/stm32mp1/stm32mp1_fip_def.h
index e37e2e6..165f152 100644
--- a/plat/st/stm32mp1/stm32mp1_fip_def.h
+++ b/plat/st/stm32mp1/stm32mp1_fip_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2023, STMicroelectronics - All Rights Reserved
+ * Copyright (C) 2021-2024, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -7,13 +7,7 @@
 #ifndef STM32MP1_FIP_DEF_H
 #define STM32MP1_FIP_DEF_H
 
-#if STM32MP15_OPTEE_RSV_SHM
-#define STM32MP_DDR_S_SIZE		U(0x01E00000)	/* 30 MB */
-#define STM32MP_DDR_SHMEM_SIZE		U(0x00200000)	/* 2 MB */
-#else
 #define STM32MP_DDR_S_SIZE		U(0x02000000)	/* 32 MB */
-#define STM32MP_DDR_SHMEM_SIZE		U(0)		/* empty */
-#endif
 
 #if TRUSTED_BOARD_BOOT && !STM32MP_USE_EXTERNAL_HEAP
 #if STM32MP15