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 0000000000000000000000000000000000000000..6eb01aa57bcbaedb3c6fb144b015007f7775d56e
--- /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 0000000000000000000000000000000000000000..fe9a66c3dcbda45effee32c0ff365f28e623d3b8
--- /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 0000000000000000000000000000000000000000..d26f5592157d7e177d7408e6e37d963303d98ee2
--- /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 0000000000000000000000000000000000000000..65aad9cf23fa143b51351b1299332f0f86212690
--- /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 0000000000000000000000000000000000000000..908f41c39f071d9d34ef89233b248f42b6ae721c
--- /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 0000000000000000000000000000000000000000..8c057c55ebac347c17a1cf3ea944411efda75b98
--- /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 0000000000000000000000000000000000000000..d2a187ba10fe762931dcff90aa4b1715e9a41fb6
--- /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 0000000000000000000000000000000000000000..c3b4550d0928d87a543677e747b69f789e4497b0
--- /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 0000000000000000000000000000000000000000..c9acb49112a1a4f11845b5efea1f5a4d7c71afef
--- /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
+