diff --git a/plat/arm/board/diphda/common/diphda_bl2_mem_params_desc.c b/plat/arm/board/diphda/common/diphda_bl2_mem_params_desc.c
new file mode 100644
index 0000000..916c868
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_bl2_mem_params_desc.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <common/desc_image_load.h>
+
+#include <platform_def.h>
+
+/*******************************************************************************
+ * Following descriptor provides BL image/ep information that gets used
+ * by BL2 to load the images and also subset of this information is
+ * passed to next BL image. The image loading sequence is managed by
+ * populating the images in required loading order. The image execution
+ * sequence is managed by populating the `next_handoff_image_id` with
+ * the next executable image id.
+ ******************************************************************************/
+static bl_mem_params_node_t bl2_mem_params_descs[] = {
+
+	/* Fill BL31 related information */
+	{
+		.image_id = BL31_IMAGE_ID,
+
+		SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
+			VERSION_2, entry_point_info_t,
+			SECURE | EXECUTABLE | EP_FIRST_EXE),
+		.ep_info.pc = BL31_BASE,
+		.ep_info.spsr = SPSR_64(MODE_EL3, MODE_SP_ELX,
+			DISABLE_ALL_EXCEPTIONS),
+			.ep_info.args.arg3 = ARM_BL31_PLAT_PARAM_VAL,
+		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
+			VERSION_2, image_info_t, IMAGE_ATTRIB_PLAT_SETUP),
+		.image_info.image_base = BL31_BASE,
+		.image_info.image_max_size = BL31_LIMIT - BL31_BASE,
+
+		.next_handoff_image_id = BL32_IMAGE_ID,
+	},
+
+	/* Fill BL32 related information */
+	{
+		.image_id = BL32_IMAGE_ID,
+
+		SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
+			VERSION_2, entry_point_info_t, SECURE | EXECUTABLE),
+		.ep_info.pc = BL32_BASE,
+			.ep_info.args.arg0 = DIPHDA_TOS_FW_CONFIG_BASE,
+		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
+			VERSION_2, image_info_t, 0),
+		.image_info.image_base = BL32_BASE,
+		.image_info.image_max_size = BL32_LIMIT - BL32_BASE,
+
+		.next_handoff_image_id = BL33_IMAGE_ID,
+	},
+
+	/* Fill TOS_FW_CONFIG related information */
+	{
+		.image_id = TOS_FW_CONFIG_ID,
+		.image_info.image_base = DIPHDA_TOS_FW_CONFIG_BASE,
+		.image_info.image_max_size = DIPHDA_TOS_FW_CONFIG_LIMIT - \
+			DIPHDA_TOS_FW_CONFIG_BASE,
+		SET_STATIC_PARAM_HEAD(ep_info, PARAM_IMAGE_BINARY,
+			VERSION_2, entry_point_info_t, SECURE | NON_EXECUTABLE),
+		SET_STATIC_PARAM_HEAD(image_info, PARAM_IMAGE_BINARY,
+		VERSION_2, image_info_t, 0),
+		.next_handoff_image_id = INVALID_IMAGE_ID,
+	},
+
+	/* Fill BL33 related information */
+	{
+		.image_id = BL33_IMAGE_ID,
+		SET_STATIC_PARAM_HEAD(ep_info, PARAM_EP,
+			VERSION_2, entry_point_info_t, NON_SECURE | EXECUTABLE),
+		.ep_info.pc = PLAT_ARM_NS_IMAGE_BASE,
+
+		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP,
+			VERSION_2, image_info_t, 0),
+		.image_info.image_base = PLAT_ARM_NS_IMAGE_BASE,
+		.image_info.image_max_size = ARM_DRAM1_BASE + ARM_DRAM1_SIZE
+			- PLAT_ARM_NS_IMAGE_BASE,
+
+		.next_handoff_image_id = INVALID_IMAGE_ID,
+	},
+};
+
+REGISTER_BL_IMAGE_DESCS(bl2_mem_params_descs)
diff --git a/plat/arm/board/diphda/common/diphda_err.c b/plat/arm/board/diphda/common/diphda_err.c
new file mode 100644
index 0000000..89a3b82
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_err.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <plat/arm/common/plat_arm.h>
+
+/*
+ * diphda error handler
+ */
+void __dead2 plat_arm_error_handler(int err)
+{
+	while (1) {
+		wfi();
+	}
+}
diff --git a/plat/arm/board/diphda/common/diphda_helpers.S b/plat/arm/board/diphda/common/diphda_helpers.S
new file mode 100644
index 0000000..c9d2a88
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_helpers.S
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <platform_def.h>
+
+	.globl	plat_secondary_cold_boot_setup
+	.globl	plat_get_my_entrypoint
+	.globl	plat_is_my_cpu_primary
+	.globl	plat_arm_calc_core_pos
+
+	/* --------------------------------------------------------------------
+	 * void plat_secondary_cold_boot_setup (void);
+	 *
+	 * For AArch32, cold-booting secondary CPUs is not yet
+	 * implemented and they panic.
+	 * --------------------------------------------------------------------
+	 */
+func plat_secondary_cold_boot_setup
+cb_panic:
+	b	cb_panic
+endfunc plat_secondary_cold_boot_setup
+
+	/* ---------------------------------------------------------------------
+	 * unsigned long plat_get_my_entrypoint (void);
+	 *
+	 * Main job of this routine is to distinguish between a cold and warm
+	 * boot. On diphda, this information can be queried from the power
+	 * controller. The Power Control SYS Status Register (PSYSR) indicates
+	 * the wake-up reason for the CPU.
+	 *
+	 * For a cold boot, return 0.
+	 * For a warm boot, Not yet supported.
+	 *
+	 * TODO: PSYSR is a common register and should be
+	 * 	accessed using locks. Since it is not possible
+	 * 	to use locks immediately after a cold reset
+	 * 	we are relying on the fact that after a cold
+	 * 	reset all cpus will read the same WK field
+	 * ---------------------------------------------------------------------
+	 */
+func plat_get_my_entrypoint
+	/* TODO support warm boot */
+	/* Cold reset */
+	mov	x0, #0
+	ret
+endfunc plat_get_my_entrypoint
+
+	/* -----------------------------------------------------
+	 * unsigned int plat_is_my_cpu_primary (void);
+	 *
+	 * Find out whether the current CPU is the primary
+	 * CPU.
+	 * -----------------------------------------------------
+	 */
+func plat_is_my_cpu_primary
+	mrs	x0, mpidr_el1
+	mov_imm	x1, MPIDR_AFFINITY_MASK
+	and	x0, x0, x1
+	cmp	x0, #DIPHDA_PRIMARY_CPU
+	cset	w0, eq
+	ret
+endfunc plat_is_my_cpu_primary
diff --git a/plat/arm/board/diphda/common/diphda_plat.c b/plat/arm/board/diphda/common/diphda_plat.c
new file mode 100644
index 0000000..28d15a5
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_plat.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <common/bl_common.h>
+
+#include <plat/arm/common/plat_arm.h>
+#include <plat/common/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,
+	ARM_MAP_NS_SHARED_RAM,
+	ARM_MAP_NS_DRAM1,
+	DIPHDA_MAP_DEVICE,
+	DIPHDA_EXTERNAL_FLASH,
+	{0}
+};
+
+/* diphda only has one always-on power domain and there
+ * is no power control present
+ */
+void __init plat_arm_pwrc_setup(void)
+{
+}
+
+unsigned int plat_get_syscnt_freq2(void)
+{
+	/* Returning the Generic Timer Frequency */
+	return SYS_COUNTER_FREQ_IN_TICKS;
+}
+
+
+/*
+ * 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)
+{
+}
+
+/*
+ * This function is invoked during Mbed TLS library initialisation to get a heap
+ * The function simply returns the default allocated heap.
+ */
+
+#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
diff --git a/plat/arm/board/diphda/common/diphda_pm.c b/plat/arm/board/diphda/common/diphda_pm.c
new file mode 100644
index 0000000..12b322e
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_pm.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <lib/psci/psci.h>
+#include <plat/arm/common/plat_arm.h>
+
+/*******************************************************************************
+ * Export the platform handlers via plat_arm_psci_pm_ops. The ARM Standard
+ * platform layer will take care of registering the handlers with PSCI.
+ ******************************************************************************/
+plat_psci_ops_t plat_arm_psci_pm_ops = {
+	/* dummy struct */
+	.validate_ns_entrypoint = NULL
+};
+
+const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
+{
+	return ops;
+}
diff --git a/plat/arm/board/diphda/common/diphda_security.c b/plat/arm/board/diphda/common/diphda_security.c
new file mode 100644
index 0000000..bf172af
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_security.c
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * We assume that all security programming is done by the primary core.
+ */
+void plat_arm_security_setup(void)
+{
+	/*
+	 * If the platform had additional peripheral specific security
+	 * configurations, those would be configured here.
+	 */
+}
diff --git a/plat/arm/board/diphda/common/diphda_stack_protector.c b/plat/arm/board/diphda/common/diphda_stack_protector.c
new file mode 100644
index 0000000..6228b63
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_stack_protector.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdint.h>
+
+#include <arch_helpers.h>
+#include <plat/common/platform.h>
+
+static uint32_t plat_generate_random_number(void)
+{
+	uintptr_t return_addr = (uintptr_t)__builtin_return_address(0U);
+	uintptr_t frame_addr = (uintptr_t)__builtin_frame_address(0U);
+	uint64_t cntpct = read_cntpct_el0();
+
+	/* Generate 32-bit pattern: saving the 2 least significant bytes
+	 * in random_lo and random_hi
+	 */
+	uint16_t random_lo = (uint16_t)(
+			(((uint64_t)return_addr) << 13) ^ frame_addr ^ cntpct
+			);
+
+	uint16_t random_hi = (uint16_t)(
+			(((uint64_t)frame_addr) << 15) ^ return_addr ^ cntpct
+			);
+
+	return (((uint32_t)random_hi) << 16) | random_lo;
+}
+
+u_register_t plat_get_stack_protector_canary(void)
+{
+	return  plat_generate_random_number(); /* a 32-bit pattern returned */
+}
diff --git a/plat/arm/board/diphda/common/diphda_topology.c b/plat/arm/board/diphda/common/diphda_topology.c
new file mode 100644
index 0000000..9dfd05d
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_topology.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <plat/arm/common/plat_arm.h>
+#include <plat/common/platform.h>
+
+/* The diphda power domain tree descriptor */
+static unsigned char diphda_power_domain_tree_desc[PLAT_ARM_CLUSTER_COUNT
+							+ 2];
+/*******************************************************************************
+ * This function dynamically constructs the topology according to
+ * CLUSTER_COUNT and returns it.
+ ******************************************************************************/
+const unsigned char *plat_get_power_domain_tree_desc(void)
+{
+	int i;
+
+	/*
+	 * The highest level is the system level. The next level is constituted
+	 * by clusters and then cores in clusters.
+	 */
+	diphda_power_domain_tree_desc[0] = 1;
+	diphda_power_domain_tree_desc[1] = PLAT_ARM_CLUSTER_COUNT;
+
+	for (i = 0; i < PLAT_ARM_CLUSTER_COUNT; i++)
+		diphda_power_domain_tree_desc[i + 2] = PLATFORM_CORE_COUNT;
+
+	return diphda_power_domain_tree_desc;
+}
+
+/******************************************************************************
+ * This function implements a part of the critical interface between the PSCI
+ * generic layer and the platform that allows the former to query the platform
+ * to convert an MPIDR to a unique linear index. An error code (-1) is
+ * returned in case the MPIDR is invalid.
+ *****************************************************************************/
+int plat_core_pos_by_mpidr(u_register_t mpidr)
+{
+	return plat_arm_calc_core_pos(mpidr);
+}
diff --git a/plat/arm/board/diphda/common/diphda_trusted_boot.c b/plat/arm/board/diphda/common/diphda_trusted_boot.c
new file mode 100644
index 0000000..da8b87c
--- /dev/null
+++ b/plat/arm/board/diphda/common/diphda_trusted_boot.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <plat/arm/common/plat_arm.h>
+
+/*
+ * Return the ROTPK hash in the following ASN.1 structure in DER format:
+ *
+ * AlgorithmIdentifier  ::=  SEQUENCE  {
+ *     algorithm         OBJECT IDENTIFIER,
+ *     parameters        ANY DEFINED BY algorithm OPTIONAL
+ * }
+ *
+ * DigestInfo ::= SEQUENCE {
+ *     digestAlgorithm   AlgorithmIdentifier,
+ *     digest            OCTET STRING
+ * }
+ *
+ * The function returns 0 on success. Any other value is treated as error by the
+ * Trusted Board Boot. The function also reports extra information related
+ * to the ROTPK in the flags parameter: ROTPK_IS_HASH, ROTPK_NOT_DEPLOYED.
+ *
+ * Refer to the TF-A porting-guide document for more details.
+ */
+int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
+			unsigned int *flags)
+{
+	return arm_get_rotpk_info(cookie, key_ptr, key_len, flags);
+}
diff --git a/plat/arm/board/diphda/common/fdts/diphda_spmc_manifest.dts b/plat/arm/board/diphda/common/fdts/diphda_spmc_manifest.dts
new file mode 100644
index 0000000..def04cd
--- /dev/null
+++ b/plat/arm/board/diphda/common/fdts/diphda_spmc_manifest.dts
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+/dts-v1/;
+
+/ {
+	compatible = "arm,ffa-core-manifest-1.0";
+	#address-cells = <2>;
+	#size-cells = <1>;
+
+	/*
+	 * BL32 image details needed by SPMC
+	 *
+	 * Note:
+	 * binary_size: size of BL32 + TOS_FW_CONFIG
+	 */
+
+	attribute {
+		spmc_id = <0x8000>;
+		maj_ver = <0x1>;
+		min_ver = <0x0>;
+		exec_state = <0x0>;
+		load_address = <0x0 0x2002000>;
+		entrypoint = <0x0 0x2002000>;
+		binary_size = <0xae000>;
+	};
+
+};
diff --git a/plat/arm/board/diphda/common/include/platform_def.h b/plat/arm/board/diphda/common/include/platform_def.h
new file mode 100644
index 0000000..37fd71b
--- /dev/null
+++ b/plat/arm/board/diphda/common/include/platform_def.h
@@ -0,0 +1,416 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PLATFORM_DEF_H
+#define PLATFORM_DEF_H
+
+#include <common/tbbr/tbbr_img_def.h>
+#include <lib/utils_def.h>
+#include <lib/xlat_tables/xlat_tables_defs.h>
+#include <plat/arm/board/common/v2m_def.h>
+#include <plat/arm/common/arm_spm_def.h>
+#include <plat/arm/common/smccc_def.h>
+#include <plat/common/common_def.h>
+#include <plat/arm/soc/common/soc_css_def.h>
+
+#define ARM_ROTPK_HEADER_LEN			19
+#define ARM_ROTPK_HASH_LEN			32
+
+/* Special value used to verify platform parameters from BL2 to BL31 */
+#define ARM_BL31_PLAT_PARAM_VAL		ULL(0x0f1e2d3c4b5a6978)
+
+/* PL011 UART related constants */
+#ifdef V2M_IOFPGA_UART0_CLK_IN_HZ
+#undef V2M_IOFPGA_UART0_CLK_IN_HZ
+#endif
+
+#ifdef V2M_IOFPGA_UART1_CLK_IN_HZ
+#undef V2M_IOFPGA_UART1_CLK_IN_HZ
+#endif
+
+#define V2M_IOFPGA_UART0_CLK_IN_HZ		50000000
+#define V2M_IOFPGA_UART1_CLK_IN_HZ		50000000
+
+/* Core/Cluster/Thread counts for diphda */
+#define DIPHDA_CLUSTER_COUNT			U(1)
+#define DIPHDA_MAX_CPUS_PER_CLUSTER		U(4)
+#define DIPHDA_MAX_PE_PER_CPU			U(1)
+#define DIPHDA_PRIMARY_CPU			U(0)
+
+#define PLAT_ARM_CLUSTER_COUNT		DIPHDA_CLUSTER_COUNT
+
+#define PLATFORM_CORE_COUNT			(PLAT_ARM_CLUSTER_COUNT *      \
+						DIPHDA_MAX_CPUS_PER_CLUSTER *  \
+						DIPHDA_MAX_PE_PER_CPU)
+
+/* UART related constants */
+#define PLAT_ARM_BOOT_UART_BASE		0x1a510000
+#define PLAT_ARM_BOOT_UART_CLK_IN_HZ		V2M_IOFPGA_UART0_CLK_IN_HZ
+#define PLAT_ARM_RUN_UART_BASE		0x1a520000
+#define PLAT_ARM_RUN_UART_CLK_IN_HZ		V2M_IOFPGA_UART1_CLK_IN_HZ
+#define ARM_CONSOLE_BAUDRATE			115200
+#define PLAT_ARM_CRASH_UART_BASE		PLAT_ARM_RUN_UART_BASE
+#define PLAT_ARM_CRASH_UART_CLK_IN_HZ		PLAT_ARM_RUN_UART_CLK_IN_HZ
+
+/* Memory related constants */
+
+/* SRAM (CVM) memory layout
+ *
+ * <ARM_TRUSTED_SRAM_BASE>
+ *
+ *         partition size: sizeof(meminfo_t) = 16 bytes
+ *
+ *         content: memory info area used by the next BL
+ *
+ * <ARM_FW_CONFIG_BASE>
+ *
+ *         partition size: 4080 bytes
+ *
+ * <ARM_BL2_MEM_DESC_BASE>
+ *
+ *         partition size: 4 KB
+ *
+ *         content:
+ *
+ *             Area where BL2 copies the images descriptors
+ *
+ * <ARM_BL_RAM_BASE> = <BL32_BASE>
+ *
+ *         partition size: 688 KB
+ *
+ *         content:
+ *
+ *             BL32 (optee-os)
+ *
+ * <DIPHDA_TOS_FW_CONFIG_BASE> = 0x20ae000
+ *
+ *         partition size: 8 KB
+ *
+ *         content:
+ *
+ *             BL32 config (TOS_FW_CONFIG)
+ *
+ * <BL31_BASE>
+ *
+ *         partition size: 140 KB
+ *
+ *         content:
+ *
+ *             BL31
+ *
+ * <BL2_SIGNATURE_BASE>
+ *
+ *     partition size: 4 KB
+ *
+ *     content:
+ *
+ *         MCUBOOT data needed to verify TF-A BL2
+ *
+ * <BL2_BASE>
+ *
+ *     partition size: 176 KB
+ *
+ *         content:
+ *
+ *             BL2
+ *
+ * <ARM_NS_SHARED_RAM_BASE> = <ARM_TRUSTED_SRAM_BASE> + 1 MB
+ *
+ *         partition size: 3 MB
+ *
+ *         content:
+ *
+ *             BL33 (u-boot)
+ */
+
+/* DDR memory */
+#define ARM_DRAM1_BASE			UL(0x80000000)
+#define ARM_DRAM1_SIZE			UL(0x80000000)
+#define ARM_DRAM1_END				(ARM_DRAM1_BASE +	\
+						ARM_DRAM1_SIZE - 1)
+
+/* DRAM1 and DRAM2 are the same for diphda */
+#define ARM_DRAM2_BASE			ARM_DRAM1_BASE
+#define ARM_DRAM2_SIZE			ARM_DRAM1_SIZE
+#define ARM_DRAM2_END				ARM_DRAM1_END
+
+#define ARM_NS_DRAM1_BASE			ARM_DRAM1_BASE
+#define ARM_NS_DRAM1_SIZE			ARM_DRAM1_SIZE
+#define ARM_NS_DRAM1_END			(ARM_NS_DRAM1_BASE +	\
+						ARM_NS_DRAM1_SIZE - 1)
+
+/* The first 8 KB of Trusted SRAM are used as shared memory */
+#define ARM_TRUSTED_SRAM_BASE			UL(0x02000000)
+#define ARM_SHARED_RAM_SIZE			UL(0x00002000)  /* 8 KB */
+#define ARM_SHARED_RAM_BASE			ARM_TRUSTED_SRAM_BASE
+
+/* The remaining Trusted SRAM is used to load the BL images */
+
+#define PLAT_ARM_TRUSTED_SRAM_SIZE		UL(0x00100000)  /* 1 MB */
+
+#define PLAT_ARM_MAX_BL2_SIZE			UL(0x0002d000)  /* 180 KB */
+
+#define PLAT_ARM_MAX_BL31_SIZE		UL(0x00023000)  /* 140 KB */
+
+#define ARM_BL_RAM_BASE			(ARM_SHARED_RAM_BASE +	\
+						ARM_SHARED_RAM_SIZE)
+#define ARM_BL_RAM_SIZE			(PLAT_ARM_TRUSTED_SRAM_SIZE -	\
+						ARM_SHARED_RAM_SIZE)
+
+#define BL2_SIGNATURE_SIZE			UL(0x00001000)  /* 4 KB */
+#define BL2_SIGNATURE_BASE			(BL2_LIMIT - \
+						PLAT_ARM_MAX_BL2_SIZE)
+#define BL2_BASE				(BL2_LIMIT - \
+						PLAT_ARM_MAX_BL2_SIZE + \
+						BL2_SIGNATURE_SIZE)
+#define BL2_LIMIT				(ARM_BL_RAM_BASE + \
+						ARM_BL_RAM_SIZE)
+
+#define BL31_BASE				(BL2_SIGNATURE_BASE - \
+						PLAT_ARM_MAX_BL31_SIZE)
+#define BL31_LIMIT				BL2_SIGNATURE_BASE
+
+#define DIPHDA_TOS_FW_CONFIG_BASE		(BL31_BASE - \
+						DIPHDA_TOS_FW_CONFIG_SIZE)
+#define DIPHDA_TOS_FW_CONFIG_SIZE		UL(0x00002000)  /* 8 KB */
+#define DIPHDA_TOS_FW_CONFIG_LIMIT		BL31_BASE
+
+#define BL32_BASE				ARM_BL_RAM_BASE
+#define PLAT_ARM_MAX_BL32_SIZE		(DIPHDA_TOS_FW_CONFIG_BASE - \
+						BL32_BASE)     /* 688 KB */
+#define BL32_LIMIT				(BL32_BASE + \
+						PLAT_ARM_MAX_BL32_SIZE)
+
+/* SPD_spmd settings */
+
+#define PLAT_ARM_SPMC_BASE			BL32_BASE
+#define PLAT_ARM_SPMC_SIZE			PLAT_ARM_MAX_BL32_SIZE
+
+/* NS memory */
+
+/* The last 3 MB of the SRAM is allocated to the non secure area */
+#define ARM_NS_SHARED_RAM_BASE		(ARM_TRUSTED_SRAM_BASE + \
+						PLAT_ARM_TRUSTED_SRAM_SIZE)
+#define ARM_NS_SHARED_RAM_SIZE		UL(0x00300000)  /* 3 MB */
+
+/* end of the definition of SRAM memory layout */
+
+/* NOR Flash */
+
+#define PLAT_ARM_FIP_BASE			UL(0x08131000)
+#define PLAT_ARM_FIP_MAX_SIZE			UL(0x1ff000)  /* 1.996 MB */
+
+#define PLAT_ARM_NVM_BASE			V2M_FLASH0_BASE
+#define PLAT_ARM_NVM_SIZE			UL(0x02000000)  /* 32 MB */
+
+#define PLAT_ARM_FLASH_IMAGE_BASE		PLAT_ARM_FIP_BASE
+#define PLAT_ARM_FLASH_IMAGE_MAX_SIZE		PLAT_ARM_FIP_MAX_SIZE
+
+/*
+ * Some data must be aligned on the biggest cache line size in the platform.
+ * This is known only to the platform as it might have a combination of
+ * integrated and external caches.
+ */
+#define CACHE_WRITEBACK_GRANULE		(U(1) << ARM_CACHE_WRITEBACK_SHIFT)
+#define ARM_CACHE_WRITEBACK_SHIFT		6
+
+/*
+ * Define FW_CONFIG area base and limit. Leave enough space for BL2 meminfo.
+ * FW_CONFIG is intended to host the device tree. Currently, This area is not
+ * used because diphda platform doesn't use a device tree at TF-A level.
+ */
+#define ARM_FW_CONFIG_BASE			(ARM_SHARED_RAM_BASE \
+						+ sizeof(meminfo_t))
+#define ARM_FW_CONFIG_LIMIT			(ARM_SHARED_RAM_BASE \
+						+ (ARM_SHARED_RAM_SIZE >> 1))
+
+/*
+ * Boot parameters passed from BL2 to BL31/BL32 are stored here
+ */
+#define ARM_BL2_MEM_DESC_BASE			ARM_FW_CONFIG_LIMIT
+#define ARM_BL2_MEM_DESC_LIMIT		ARM_BL_RAM_BASE
+
+/*
+ * The max number of regions like RO(code), coherent and data required by
+ * different BL stages which need to be mapped in the MMU.
+ */
+#define ARM_BL_REGIONS			3
+#define PLAT_ARM_MMAP_ENTRIES			8
+#define MAX_XLAT_TABLES			5
+#define MAX_MMAP_REGIONS			(PLAT_ARM_MMAP_ENTRIES + \
+						ARM_BL_REGIONS)
+#define MAX_IO_DEVICES			2
+#define MAX_IO_HANDLES			3
+#define MAX_IO_BLOCK_DEVICES			1
+
+/* GIC related constants */
+#define PLAT_ARM_GICD_BASE			0x1C010000
+#define PLAT_ARM_GICC_BASE			0x1C02F000
+
+/* MHUv2 Secure Channel receiver and sender */
+#define PLAT_SDK700_MHU0_SEND			0x1B800000
+#define PLAT_SDK700_MHU0_RECV			0x1B810000
+
+/* Timer/watchdog related constants */
+#define ARM_SYS_CNTCTL_BASE			UL(0x1a200000)
+#define ARM_SYS_CNTREAD_BASE			UL(0x1a210000)
+#define ARM_SYS_TIMCTL_BASE			UL(0x1a220000)
+
+#define SYS_COUNTER_FREQ_IN_TICKS	UL(50000000) /* 50MHz */
+
+#define DIPHDA_IRQ_TZ_WDOG			32
+#define DIPHDA_IRQ_SEC_SYS_TIMER		34
+
+#define PLAT_MAX_PWR_LVL			2
+/*
+ * Macros mapping the MPIDR Affinity levels to ARM Platform Power levels. The
+ * power levels have a 1:1 mapping with the MPIDR affinity levels.
+ */
+#define ARM_PWR_LVL0				MPIDR_AFFLVL0
+#define ARM_PWR_LVL1				MPIDR_AFFLVL1
+#define ARM_PWR_LVL2				MPIDR_AFFLVL2
+
+/*
+ *  Macros for local power states in ARM platforms encoded by State-ID field
+ *  within the power-state parameter.
+ */
+/* Local power state for power domains in Run state. */
+#define ARM_LOCAL_STATE_RUN			U(0)
+/* Local power state for retention. Valid only for CPU power domains */
+#define ARM_LOCAL_STATE_RET			U(1)
+/* Local power state for OFF/power-down. Valid for CPU and cluster
+ * power domains
+ */
+#define ARM_LOCAL_STATE_OFF			U(2)
+
+#define PLAT_ARM_TRUSTED_MAILBOX_BASE		ARM_TRUSTED_SRAM_BASE
+#define PLAT_ARM_NSTIMER_FRAME_ID		U(1)
+
+#define PLAT_ARM_NS_IMAGE_BASE		(ARM_NS_SHARED_RAM_BASE)
+
+#define PLAT_PHY_ADDR_SPACE_SIZE		(1ULL << 32)
+#define PLAT_VIRT_ADDR_SPACE_SIZE		(1ULL << 32)
+
+/*
+ * This macro defines the deepest retention state possible. A higher state
+ * ID will represent an invalid or a power down state.
+ */
+#define PLAT_MAX_RET_STATE			1
+
+/*
+ * This macro defines the deepest power down states possible. Any state ID
+ * higher than this is invalid.
+ */
+#define PLAT_MAX_OFF_STATE			2
+
+#define PLATFORM_STACK_SIZE			UL(0x440)
+
+#define DIPHDA_EXTERNAL_FLASH			MAP_REGION_FLAT(	\
+						PLAT_ARM_NVM_BASE,	\
+						PLAT_ARM_NVM_SIZE,	\
+						MT_DEVICE | MT_RO | MT_SECURE)
+
+#define ARM_MAP_SHARED_RAM			MAP_REGION_FLAT(	\
+						ARM_SHARED_RAM_BASE,	\
+						ARM_SHARED_RAM_SIZE,	\
+						MT_MEMORY | MT_RW | MT_SECURE)
+
+#define ARM_MAP_NS_SHARED_RAM			MAP_REGION_FLAT(	\
+						ARM_NS_SHARED_RAM_BASE, \
+						ARM_NS_SHARED_RAM_SIZE, \
+						MT_MEMORY | MT_RW | MT_NS)
+
+#define ARM_MAP_NS_DRAM1			MAP_REGION_FLAT(	\
+						ARM_NS_DRAM1_BASE,	\
+						ARM_NS_DRAM1_SIZE,	\
+						MT_MEMORY | MT_RW | MT_NS)
+
+#define ARM_MAP_BL_RO				MAP_REGION_FLAT(	\
+						BL_CODE_BASE,		\
+						BL_CODE_END		\
+							- BL_CODE_BASE, \
+						MT_CODE | MT_SECURE),	\
+						MAP_REGION_FLAT(	\
+						BL_RO_DATA_BASE,	\
+						BL_RO_DATA_END	\
+						- BL_RO_DATA_BASE,	\
+						MT_RO_DATA | MT_SECURE)
+#if USE_COHERENT_MEM
+#define ARM_MAP_BL_COHERENT_RAM		MAP_REGION_FLAT(	\
+						BL_COHERENT_RAM_BASE,	\
+						BL_COHERENT_RAM_END	\
+						- BL_COHERENT_RAM_BASE, \
+						MT_DEVICE | MT_RW | MT_SECURE)
+#endif
+
+/*
+ * Map the region for the optional device tree configuration with read and
+ * write permissions
+ */
+#define ARM_MAP_BL_CONFIG_REGION		MAP_REGION_FLAT(	\
+						ARM_FW_CONFIG_BASE,	\
+						(ARM_FW_CONFIG_LIMIT-   \
+						ARM_FW_CONFIG_BASE),   \
+						MT_MEMORY | MT_RW | MT_SECURE)
+
+#define DIPHDA_DEVICE_BASE			(0x1A000000)
+#define DIPHDA_DEVICE_SIZE			(0x26000000)
+#define DIPHDA_MAP_DEVICE			MAP_REGION_FLAT(	\
+						DIPHDA_DEVICE_BASE,	\
+						DIPHDA_DEVICE_SIZE,	\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+#define ARM_IRQ_SEC_PHY_TIMER			29
+
+#define ARM_IRQ_SEC_SGI_0			8
+#define ARM_IRQ_SEC_SGI_1			9
+#define ARM_IRQ_SEC_SGI_2			10
+#define ARM_IRQ_SEC_SGI_3			11
+#define ARM_IRQ_SEC_SGI_4			12
+#define ARM_IRQ_SEC_SGI_5			13
+#define ARM_IRQ_SEC_SGI_6			14
+#define ARM_IRQ_SEC_SGI_7			15
+
+/*
+ * Define a list of Group 1 Secure and Group 0 interrupt properties as per GICv3
+ * terminology. On a GICv2 system or mode, the lists will be merged and treated
+ * as Group 0 interrupts.
+ */
+#define ARM_G1S_IRQ_PROPS(grp) \
+	INTR_PROP_DESC(ARM_IRQ_SEC_PHY_TIMER, GIC_HIGHEST_SEC_PRIORITY, \
+		(grp), GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(ARM_IRQ_SEC_SGI_1, GIC_HIGHEST_SEC_PRIORITY,	\
+		(grp), GIC_INTR_CFG_EDGE), \
+	INTR_PROP_DESC(ARM_IRQ_SEC_SGI_2, GIC_HIGHEST_SEC_PRIORITY,	\
+		(grp), GIC_INTR_CFG_EDGE), \
+	INTR_PROP_DESC(ARM_IRQ_SEC_SGI_3, GIC_HIGHEST_SEC_PRIORITY,	\
+		(grp), GIC_INTR_CFG_EDGE), \
+	INTR_PROP_DESC(ARM_IRQ_SEC_SGI_4, GIC_HIGHEST_SEC_PRIORITY,	\
+		(grp), GIC_INTR_CFG_EDGE), \
+	INTR_PROP_DESC(ARM_IRQ_SEC_SGI_5, GIC_HIGHEST_SEC_PRIORITY,	\
+		(grp), GIC_INTR_CFG_EDGE), \
+	INTR_PROP_DESC(ARM_IRQ_SEC_SGI_7, GIC_HIGHEST_SEC_PRIORITY,	\
+		(grp), GIC_INTR_CFG_EDGE)
+
+#define ARM_G0_IRQ_PROPS(grp) \
+	INTR_PROP_DESC(ARM_IRQ_SEC_SGI_6, GIC_HIGHEST_SEC_PRIORITY, (grp), \
+		GIC_INTR_CFG_EDGE)
+
+/*
+ * Define a list of Group 1 Secure and Group 0 interrupts as per GICv3
+ * terminology. On a GICv2 system or mode, the lists will be merged and treated
+ * as Group 0 interrupts.
+ */
+#define PLAT_ARM_G1S_IRQ_PROPS(grp)	\
+	ARM_G1S_IRQ_PROPS(grp), \
+	INTR_PROP_DESC(DIPHDA_IRQ_TZ_WDOG, GIC_HIGHEST_SEC_PRIORITY, \
+		(grp), GIC_INTR_CFG_LEVEL), \
+	INTR_PROP_DESC(DIPHDA_IRQ_SEC_SYS_TIMER, \
+		GIC_HIGHEST_SEC_PRIORITY, (grp), GIC_INTR_CFG_LEVEL)
+
+#define PLAT_ARM_G0_IRQ_PROPS(grp)	ARM_G0_IRQ_PROPS(grp)
+
+#endif /* PLATFORM_DEF_H */
diff --git a/plat/arm/board/diphda/include/plat_macros.S b/plat/arm/board/diphda/include/plat_macros.S
new file mode 100644
index 0000000..4de8f95
--- /dev/null
+++ b/plat/arm/board/diphda/include/plat_macros.S
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2021, 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.
+ * ---------------------------------------------
+ */
+	.macro plat_crash_print_regs
+	css_print_gic_regs
+	.endm
+
+#endif /* PLAT_MACROS_S */
diff --git a/plat/arm/board/diphda/platform.mk b/plat/arm/board/diphda/platform.mk
new file mode 100644
index 0000000..62d7184
--- /dev/null
+++ b/plat/arm/board/diphda/platform.mk
@@ -0,0 +1,68 @@
+#
+# Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# Making sure the diphda platform type is specified
+ifeq ($(filter ${TARGET_PLATFORM}, fpga fvp),)
+	$(error TARGET_PLATFORM must be fpga or fvp)
+endif
+
+DIPHDA_CPU_LIBS	+=lib/cpus/aarch64/cortex_a35.S
+
+PLAT_INCLUDES		:=	-Iplat/arm/board/diphda/common/include	\
+				-Iplat/arm/board/diphda/include		\
+				-Iinclude/plat/arm/common			\
+				-Iinclude/plat/arm/css/common/aarch64
+
+override NEED_BL1	:=	no
+
+override NEED_BL2	:=	yes
+FIP_BL2_ARGS := tb-fw
+
+override NEED_BL2U	:=	no
+override NEED_BL31	:=	yes
+NEED_BL32		:=	yes
+override NEED_BL33	:=	yes
+
+# Include GICv2 driver files
+include drivers/arm/gic/v2/gicv2.mk
+
+DIPHDA_GIC_SOURCES	:=	${GICV2_SOURCES}			\
+				plat/common/plat_gicv2.c		\
+				plat/arm/common/arm_gicv2.c
+
+
+BL2_SOURCES		+=	plat/arm/board/diphda/common/diphda_security.c		\
+				plat/arm/board/diphda/common/diphda_err.c		\
+				plat/arm/board/diphda/common/diphda_trusted_boot.c	\
+				lib/utils/mem_region.c					\
+				plat/arm/board/diphda/common/diphda_helpers.S		\
+				plat/arm/board/diphda/common/diphda_plat.c		\
+				plat/arm/board/diphda/common/diphda_bl2_mem_params_desc.c \
+				${DIPHDA_CPU_LIBS}					\
+
+
+BL31_SOURCES	+=	drivers/cfi/v2m/v2m_flash.c				\
+			lib/utils/mem_region.c					\
+			plat/arm/board/diphda/common/diphda_helpers.S		\
+			plat/arm/board/diphda/common/diphda_topology.c		\
+			plat/arm/board/diphda/common/diphda_security.c		\
+			plat/arm/board/diphda/common/diphda_plat.c		\
+			plat/arm/board/diphda/common/diphda_pm.c		\
+			${DIPHDA_CPU_LIBS}					\
+			${DIPHDA_GIC_SOURCES}
+
+
+FDT_SOURCES		+=	plat/arm/board/diphda/common/fdts/diphda_spmc_manifest.dts
+DIPHDA_TOS_FW_CONFIG	:=	${BUILD_PLAT}/fdts/diphda_spmc_manifest.dtb
+
+# Add the SPMC manifest to FIP and specify the same to certtool
+$(eval $(call TOOL_ADD_PAYLOAD,${DIPHDA_TOS_FW_CONFIG},--tos-fw-config,${DIPHDA_TOS_FW_CONFIG}))
+
+# Adding TARGET_PLATFORM as a GCC define (-D option)
+$(eval $(call add_define,TARGET_PLATFORM_$(call uppercase,${TARGET_PLATFORM})))
+
+include plat/arm/common/arm_common.mk
+include plat/arm/board/common/board_common.mk