diff --git a/plat/arm/board/n1sdp/aarch64/n1sdp_helper.S b/plat/arm/board/n1sdp/aarch64/n1sdp_helper.S
new file mode 100644
index 0000000..6eb01aa
--- /dev/null
+++ b/plat/arm/board/n1sdp/aarch64/n1sdp_helper.S
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <cortex_ares.h>
+#include <cpu_macros.S>
+#include <platform_def.h>
+
+	.globl	plat_arm_calc_core_pos
+	.globl	plat_reset_handler
+
+	/* -----------------------------------------------------
+	 * unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
+	 *
+	 * Helper function to calculate the core position.
+	 * (ClusterId * N1SDP_MAX_CPUS_PER_CLUSTER * N1SDP_MAX_PE_PER_CPU) +
+	 * (CPUId * N1SDP_MAX_PE_PER_CPU) +
+	 * ThreadId
+	 *
+	 * which can be simplified as:
+	 *
+	 * ((ClusterId * N1SDP_MAX_CPUS_PER_CLUSTER + CPUId) *
+	 * N1SDP_MAX_PE_PER_CPU) + ThreadId
+	 * ------------------------------------------------------
+	 */
+
+func plat_arm_calc_core_pos
+	mov	x3, x0
+
+	/*
+	 * The MT bit in MPIDR is always set for n1sdp and the
+	 * affinity level 0 corresponds to thread affinity level.
+	 */
+
+	/* Extract individual affinity fields from MPIDR */
+	ubfx	x0, x3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS
+	ubfx	x1, x3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS
+	ubfx	x2, x3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
+
+	/* Compute linear position */
+	mov	x4, #N1SDP_MAX_CPUS_PER_CLUSTER
+	madd	x1, x2, x4, x1
+	mov	x5, #N1SDP_MAX_PE_PER_CPU
+	madd	x0, x1, x5, x0
+	ret
+endfunc plat_arm_calc_core_pos
+
+	/* -----------------------------------------------------
+	 * void plat_reset_handler(void);
+	 *
+	 * Determine the CPU MIDR and disable power down bit for
+	 * that CPU.
+	 * -----------------------------------------------------
+	 */
+
+func plat_reset_handler
+	jump_if_cpu_midr CORTEX_ARES_MIDR, ARES
+	ret
+
+	/* -----------------------------------------------------
+	 * Disable CPU power down bit in power control register
+	 * -----------------------------------------------------
+	 */
+ARES:
+	mrs	x0, CORTEX_ARES_CPUPWRCTLR_EL1
+	bic	x0, x0, #CORTEX_ARES_CORE_PWRDN_EN_MASK
+	msr	CORTEX_ARES_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc plat_reset_handler
diff --git a/plat/arm/board/n1sdp/include/plat_macros.S b/plat/arm/board/n1sdp/include/plat_macros.S
new file mode 100644
index 0000000..fe9a66c
--- /dev/null
+++ b/plat/arm/board/n1sdp/include/plat_macros.S
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef __PLAT_MACROS_S__
+#define __PLAT_MACROS_S__
+
+#include <css_macros.S>
+
+/* ---------------------------------------------
+ * The below required platform porting macro
+ * prints out relevant platform registers
+ * whenever an unhandled exception is taken in
+ * BL31.
+ *
+ * There are currently no platform specific regs
+ * to print.
+ * ---------------------------------------------
+ */
+	.macro plat_crash_print_regs
+	.endm
+#endif /* __PLAT_MACROS_S__ */
diff --git a/plat/arm/board/n1sdp/include/platform_def.h b/plat/arm/board/n1sdp/include/platform_def.h
new file mode 100644
index 0000000..d26f559
--- /dev/null
+++ b/plat/arm/board/n1sdp/include/platform_def.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __PLATFORM_DEF_H__
+#define __PLATFORM_DEF_H__
+
+#include <arm_def.h>
+#include <board_css_def.h>
+#include <css_def.h>
+
+#if CSS_USE_SCMI_SDS_DRIVER
+#define N1SDP_SCMI_PAYLOAD_BASE			0x45400000
+#else
+#define PLAT_CSS_SCP_COM_SHARED_MEM_BASE	0x45400000
+#endif
+
+#define PLAT_ARM_TRUSTED_SRAM_SIZE		0x00080000	/* 512 KB */
+#define PLAT_ARM_MAX_BL31_SIZE			0X20000
+
+
+/*******************************************************************************
+ * N1SDP topology related constants
+ ******************************************************************************/
+#define N1SDP_MAX_CPUS_PER_CLUSTER		2
+#define PLAT_ARM_CLUSTER_COUNT			2
+#define N1SDP_MAX_PE_PER_CPU			1
+
+#define PLATFORM_CORE_COUNT			(PLAT_ARM_CLUSTER_COUNT *	\
+						N1SDP_MAX_CPUS_PER_CLUSTER *	\
+						N1SDP_MAX_PE_PER_CPU)
+
+
+/*
+ * PLAT_ARM_MMAP_ENTRIES depends on the number of entries in the
+ * plat_arm_mmap array defined for each BL stage.
+ */
+#define PLAT_ARM_MMAP_ENTRIES			3
+#define MAX_XLAT_TABLES				4
+
+#define PLATFORM_STACK_SIZE			0x400
+
+#define PLAT_ARM_NSTIMER_FRAME_ID		0
+#define PLAT_CSS_MHU_BASE			0x45000000
+#define PLAT_MAX_PWR_LVL			1
+
+#define PLAT_ARM_G1S_IRQS			ARM_G1S_IRQS,			\
+						CSS_IRQ_MHU
+#define PLAT_ARM_G0_IRQS			ARM_G0_IRQS
+
+#define PLAT_ARM_G1S_IRQ_PROPS(grp)		CSS_G1S_IRQ_PROPS(grp)
+#define PLAT_ARM_G0_IRQ_PROPS(grp)		ARM_G0_IRQ_PROPS(grp)
+
+
+#define N1SDP_DEVICE_BASE			(0x20000000)
+#define N1SDP_DEVICE_SIZE			(0x20000000)
+#define N1SDP_MAP_DEVICE			MAP_REGION_FLAT(	\
+						N1SDP_DEVICE_BASE,	\
+						N1SDP_DEVICE_SIZE,	\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+/* GIC related constants */
+#define PLAT_ARM_GICD_BASE			0x30000000
+#define PLAT_ARM_GICC_BASE			0x2C000000
+#define PLAT_ARM_GICR_BASE			0x300C0000
+
+/* Platform ID address */
+#define SSC_VERSION				(SSC_REG_BASE + SSC_VERSION_OFFSET)
+#endif /* __PLATFORM_DEF_H__ */
diff --git a/plat/arm/board/n1sdp/n1sdp_bl31_setup.c b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
new file mode 100644
index 0000000..65aad9c
--- /dev/null
+++ b/plat/arm/board/n1sdp/n1sdp_bl31_setup.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "../../css/drivers/scmi/scmi.h"
+#include "../../css/drivers/mhu/css_mhu_doorbell.h"
+#include <platform_def.h>
+
+static scmi_channel_plat_info_t n1sdp_scmi_plat_info = {
+		.scmi_mbx_mem = N1SDP_SCMI_PAYLOAD_BASE,
+		.db_reg_addr = PLAT_CSS_MHU_BASE + CSS_SCMI_MHU_DB_REG_OFF,
+		.db_preserve_mask = 0xfffffffe,
+		.db_modify_mask = 0x1,
+		.ring_doorbell = &mhu_ring_doorbell,
+};
+
+scmi_channel_plat_info_t *plat_css_get_scmi_info()
+{
+	return &n1sdp_scmi_plat_info;
+}
diff --git a/plat/arm/board/n1sdp/n1sdp_interconnect.c b/plat/arm/board/n1sdp/n1sdp_interconnect.c
new file mode 100644
index 0000000..908f41c
--- /dev/null
+++ b/plat/arm/board/n1sdp/n1sdp_interconnect.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+/*
+ * For N1SDP which support FCM (with automatic interconnect enter/exit),
+ * we should not do anything in these interface functions.
+ * They are used to override the weak functions in cci drivers.
+ */
+
+/******************************************************************************
+ * Helper function to initialize ARM interconnect driver.
+ *****************************************************************************/
+void plat_arm_interconnect_init(void)
+{
+}
+
+/******************************************************************************
+ * Helper function to place current master into coherency
+ *****************************************************************************/
+void plat_arm_interconnect_enter_coherency(void)
+{
+}
+
+/******************************************************************************
+ * Helper function to remove current master from coherency
+ *****************************************************************************/
+void plat_arm_interconnect_exit_coherency(void)
+{
+}
diff --git a/plat/arm/board/n1sdp/n1sdp_plat.c b/plat/arm/board/n1sdp/n1sdp_plat.c
new file mode 100644
index 0000000..8c057c5
--- /dev/null
+++ b/plat/arm/board/n1sdp/n1sdp_plat.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arm_def.h>
+#include <bl_common.h>
+#include <debug.h>
+#include <plat_arm.h>
+#include <platform.h>
+#include <platform_def.h>
+
+/*
+ * Table of regions to map using the MMU.
+ * Replace or extend the below regions as required
+ */
+
+const mmap_region_t plat_arm_mmap[] = {
+	ARM_MAP_SHARED_RAM,
+	N1SDP_MAP_DEVICE,
+	SOC_CSS_MAP_DEVICE,
+	{0}
+};
+
diff --git a/plat/arm/board/n1sdp/n1sdp_security.c b/plat/arm/board/n1sdp/n1sdp_security.c
new file mode 100644
index 0000000..d2a187b
--- /dev/null
+++ b/plat/arm/board/n1sdp/n1sdp_security.c
@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * TZC programming is currently not done.
+ */
+void plat_arm_security_setup(void)
+{
+}
diff --git a/plat/arm/board/n1sdp/n1sdp_topology.c b/plat/arm/board/n1sdp/n1sdp_topology.c
new file mode 100644
index 0000000..c3b4550
--- /dev/null
+++ b/plat/arm/board/n1sdp/n1sdp_topology.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <plat_arm.h>
+
+/* Topology */
+typedef struct n1sdp_topology {
+	const unsigned char *power_tree;
+	unsigned int plat_cluster_core_count;
+} n1sdp_topology_t;
+
+/*
+ * The power domain tree descriptor. The cluster power domains are
+ * arranged so that when the PSCI generic code creates the power domain tree,
+ * the indices of the CPU power domain nodes it allocates match the linear
+ * indices returned by plat_core_pos_by_mpidr().
+ */
+const unsigned char n1sdp_pd_tree_desc[] = {
+	PLAT_ARM_CLUSTER_COUNT,
+	N1SDP_MAX_CPUS_PER_CLUSTER,
+	N1SDP_MAX_CPUS_PER_CLUSTER
+};
+
+/* Topology configuration for n1sdp */
+const n1sdp_topology_t n1sdp_topology = {
+	.power_tree = n1sdp_pd_tree_desc,
+	.plat_cluster_core_count = N1SDP_MAX_CPUS_PER_CLUSTER
+};
+
+/*******************************************************************************
+ * This function returns the topology tree information.
+ ******************************************************************************/
+const unsigned char *plat_get_power_domain_tree_desc(void)
+{
+	return n1sdp_topology.power_tree;
+}
+
+/*******************************************************************************
+ * This function returns the core count within the cluster corresponding to
+ * `mpidr`.
+ ******************************************************************************/
+unsigned int plat_arm_get_cluster_core_count(u_register_t mpidr)
+{
+	return n1sdp_topology.plat_cluster_core_count;
+}
+
+/*******************************************************************************
+ * The array mapping platform core position (implemented by plat_my_core_pos())
+ * to the SCMI power domain ID implemented by SCP.
+ ******************************************************************************/
+const uint32_t plat_css_core_pos_to_scmi_dmn_id_map[PLATFORM_CORE_COUNT] = {
+	0, 1, 2, 3};
diff --git a/plat/arm/board/n1sdp/platform.mk b/plat/arm/board/n1sdp/platform.mk
new file mode 100644
index 0000000..c9acb49
--- /dev/null
+++ b/plat/arm/board/n1sdp/platform.mk
@@ -0,0 +1,67 @@
+#
+# Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+
+N1SDP_BASE		:=	plat/arm/board/n1sdp
+
+INTERCONNECT_SOURCES	:=	${N1SDP_BASE}/n1sdp_interconnect.c
+
+PLAT_INCLUDES		:=	-I${N1SDP_BASE}/include
+
+
+N1SDP_CPU_SOURCES	:=	lib/cpus/aarch64/cortex_ares.S
+
+
+N1SDP_GIC_SOURCES	:=	drivers/arm/gic/common/gic_common.c	\
+				drivers/arm/gic/v3/gicv3_main.c		\
+				drivers/arm/gic/v3/gicv3_helpers.c	\
+				plat/common/plat_gicv3.c		\
+				plat/arm/common/arm_gicv3.c		\
+				drivers/arm/gic/v3/gic600.c
+
+PLAT_BL_COMMON_SOURCES	:=	${N1SDP_BASE}/n1sdp_plat.c	        \
+				${N1SDP_BASE}/aarch64/n1sdp_helper.S
+
+
+BL31_SOURCES		:=	${N1SDP_CPU_SOURCES}			\
+				${INTERCONNECT_SOURCES}			\
+				${N1SDP_GIC_SOURCES}			\
+				${N1SDP_BASE}/n1sdp_bl31_setup.c	        \
+				${N1SDP_BASE}/n1sdp_topology.c	        \
+				${N1SDP_BASE}/n1sdp_security.c
+
+
+# TF-A not required to load the SCP Images
+override CSS_LOAD_SCP_IMAGES	  	:=	0
+
+# BL1/BL2 Image not a part of the capsule Image for n1sdp
+override NEED_BL1		  	:=	no
+override NEED_BL2		  	:=	no
+override NEED_BL2U		  	:=	no
+
+#TFA for n1sdp starts from BL31
+override RESET_TO_BL31            	:=	1
+
+# 32 bit mode not supported
+override CTX_INCLUDE_AARCH32_REGS 	:=	0
+
+override ARM_PLAT_MT              	:=	1
+
+# Select SCMI/SDS drivers instead of SCPI/BOM driver for communicating with the
+# SCP during power management operations and for SCP RAM Firmware transfer.
+CSS_USE_SCMI_SDS_DRIVER		  	:=	1
+
+# System coherency is managed in hardware
+HW_ASSISTED_COHERENCY			:=	1
+
+# When building for systems with hardware-assisted coherency, there's no need to
+# use USE_COHERENT_MEM. Require that USE_COHERENT_MEM must be set to 0 too.
+USE_COHERENT_MEM			:=	0
+include plat/arm/common/arm_common.mk
+include plat/arm/css/common/css_common.mk
+include plat/arm/soc/common/soc_css.mk
+include plat/arm/board/common/board_common.mk
+