diff --git a/plat/arm/board/n1sdp/n1sdp_plat.c b/plat/arm/board/n1sdp/n1sdp_plat.c
index 951a562..502268c 100644
--- a/plat/arm/board/n1sdp/n1sdp_plat.c
+++ b/plat/arm/board/n1sdp/n1sdp_plat.c
@@ -1,16 +1,13 @@
 /*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2022, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <platform_def.h>
+#include <assert.h>
 
-#include <common/bl_common.h>
-#include <common/debug.h>
-#include <plat/arm/common/plat_arm.h>
-#include <plat/common/platform.h>
 #include <drivers/arm/sbsa.h>
+#include <plat/arm/common/plat_arm.h>
 
 #include "n1sdp_def.h"
 
@@ -19,17 +16,51 @@
  * Replace or extend the below regions as required
  */
 
+#if IMAGE_BL1
+const mmap_region_t plat_arm_mmap[] = {
+	ARM_MAP_SHARED_RAM,
+	N1SDP_MAP_DEVICE,
+	N1SDP_MAP_NS_SRAM,
+	ARM_MAP_DRAM1,
+	{0}
+};
+#endif
+
+#if IMAGE_BL2
 const mmap_region_t plat_arm_mmap[] = {
 	ARM_MAP_SHARED_RAM,
 	N1SDP_MAP_DEVICE,
 	N1SDP_MAP_NS_SRAM,
 	ARM_MAP_DRAM1,
 	ARM_MAP_DRAM2,
+#if TRUSTED_BOARD_BOOT && !BL2_AT_EL3
+	ARM_MAP_BL1_RW,
+#endif
+	{0}
+};
+#endif
+
+#if IMAGE_BL31
+const mmap_region_t plat_arm_mmap[] = {
+	ARM_MAP_SHARED_RAM,
+	N1SDP_MAP_DEVICE,
+	N1SDP_MAP_NS_SRAM,
 	N1SDP_MAP_REMOTE_DEVICE,
 	N1SDP_MAP_REMOTE_DRAM1,
 	N1SDP_MAP_REMOTE_DRAM2,
 	{0}
 };
+#endif
+
+#if TRUSTED_BOARD_BOOT
+int plat_get_mbedtls_heap(void **heap_addr, size_t *heap_size)
+{
+	assert(heap_addr != NULL);
+	assert(heap_size != NULL);
+
+	return arm_get_mbedtls_heap(heap_addr, heap_size);
+}
+#endif
 
 void plat_arm_secure_wdt_start(void)
 {