diff --git a/plat/arm/board/sgm775/fdts/sgm775_fw_config.dts b/plat/arm/board/sgm775/fdts/sgm775_fw_config.dts
deleted file mode 100644
index 5d478e9..0000000
--- a/plat/arm/board/sgm775/fdts/sgm775_fw_config.dts
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <common/tbbr/tbbr_img_def.h>
-
-/dts-v1/;
-
-/ {
-	dtb-registry {
-		compatible = "fconf,dyn_cfg-dtb_registry";
-
-		tb_fw-config {
-			load-address = <0x0 0x4001300>;
-			max-size = <0x200>;
-			id = <TB_FW_CONFIG_ID>;
-		};
-	};
-};
diff --git a/plat/arm/board/sgm775/fdts/sgm775_tb_fw_config.dts b/plat/arm/board/sgm775/fdts/sgm775_tb_fw_config.dts
deleted file mode 100644
index 49eda27..0000000
--- a/plat/arm/board/sgm775/fdts/sgm775_tb_fw_config.dts
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-/dts-v1/;
-
-/ {
-	tb_fw-config {
-		compatible = "arm,tb_fw";
-
-		/* Disable authentication for development */
-		disable_auth = <0x0>;
-
-		/*
-		 * The following two entries are placeholders for Mbed TLS
-		 * heap information. The default values don't matter since
-		 * they will be overwritten by BL1.
-		 * In case of having shared Mbed TLS heap between BL1 and BL2,
-		 * BL1 will populate these two properties with the respective
-		 * info about the shared heap. This info will be available for
-		 * BL2 in order to locate and re-use the heap.
-		 */
-		mbedtls_heap_addr = <0x0 0x0>;
-		mbedtls_heap_size = <0x0>;
-	};
-};
diff --git a/plat/arm/board/sgm775/include/platform_def.h b/plat/arm/board/sgm775/include/platform_def.h
deleted file mode 100644
index e83cd57..0000000
--- a/plat/arm/board/sgm775/include/platform_def.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#ifndef PLATFORM_DEF_H
-#define PLATFORM_DEF_H
-
-#include <sgm_base_platform_def.h>
-
-#define PLAT_MAX_CPUS_PER_CLUSTER	U(8)
-#define PLAT_MAX_PE_PER_CPU		U(1)
-
-#define PLAT_ARM_DRAM2_BASE		ULL(0x880000000)
-#define PLAT_ARM_DRAM2_SIZE		ULL(0x180000000)
-
-/*
- * Physical and virtual address space limits for MMU in AARCH64 & AARCH32 modes
- */
-#ifdef __aarch64__
-#define PLAT_PHY_ADDR_SPACE_SIZE	(1ULL << 36)
-#define PLAT_VIRT_ADDR_SPACE_SIZE	(1ULL << 36)
-#else
-#define PLAT_PHY_ADDR_SPACE_SIZE	(1ULL << 32)
-#define PLAT_VIRT_ADDR_SPACE_SIZE	(1ULL << 32)
-#endif
-
-#endif /* PLATFORM_DEF_H */
diff --git a/plat/arm/board/sgm775/platform.mk b/plat/arm/board/sgm775/platform.mk
deleted file mode 100644
index f8df1a7..0000000
--- a/plat/arm/board/sgm775/platform.mk
+++ /dev/null
@@ -1,39 +0,0 @@
-#
-# Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
-#
-# SPDX-License-Identifier: BSD-3-Clause
-#
-
-$(warning Platform ${PLAT} is deprecated. Some of the features might not work as expected)
-
-include plat/arm/css/sgm/sgm-common.mk
-
-SGM775_BASE= plat/arm/board/sgm775
-
-# Add the FDT_SOURCES and options for Dynamic Config
-FDT_SOURCES		+=      ${SGM775_BASE}/fdts/${PLAT}_fw_config.dts	\
-				${SGM775_BASE}/fdts/${PLAT}_tb_fw_config.dts
-FW_CONFIG		:=      ${BUILD_PLAT}/fdts/${PLAT}_fw_config.dtb
-TB_FW_CONFIG		:=      ${BUILD_PLAT}/fdts/${PLAT}_tb_fw_config.dtb
-
-# Add the FW_CONFIG to FIP and specify the same to certtool
-$(eval $(call TOOL_ADD_PAYLOAD,${FW_CONFIG},--fw-config,${FW_CONFIG}))
-# Add the TB_FW_CONFIG to FIP and specify the same to certtool
-$(eval $(call TOOL_ADD_PAYLOAD,${TB_FW_CONFIG},--tb-fw-config,${TB_FW_CONFIG}))
-
-PLAT_INCLUDES +=-I${SGM775_BASE}/include/
-
-BL1_SOURCES		+=	${SGM775_BASE}/sgm775_err.c
-
-BL2_SOURCES		+=	lib/utils/mem_region.c                  \
-				${SGM775_BASE}/sgm775_err.c		\
-				plat/arm/common/arm_nor_psci_mem_protect.c
-
-BL31_SOURCES		+=	drivers/cfi/v2m/v2m_flash.c		\
-				lib/utils/mem_region.c			\
-				plat/arm/common/arm_nor_psci_mem_protect.c
-
-ifeq (${TRUSTED_BOARD_BOOT}, 1)
-BL1_SOURCES		+=	${SGM775_BASE}/sgm775_trusted_boot.c
-BL2_SOURCES		+=	${SGM775_BASE}/sgm775_trusted_boot.c
-endif
diff --git a/plat/arm/board/sgm775/sgm775_err.c b/plat/arm/board/sgm775/sgm775_err.c
deleted file mode 100644
index dc114f0..0000000
--- a/plat/arm/board/sgm775/sgm775_err.c
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright (c) 2019-2020, Arm Limited. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <plat/arm/common/plat_arm.h>
-
-/*
- * sgm775 error handler
- */
-void __dead2 plat_arm_error_handler(int err)
-{
-	while (true) {
-		wfi();
-	}
-}
diff --git a/plat/arm/board/sgm775/sgm775_trusted_boot.c b/plat/arm/board/sgm775/sgm775_trusted_boot.c
deleted file mode 100644
index 4592b8f..0000000
--- a/plat/arm/board/sgm775/sgm775_trusted_boot.c
+++ /dev/null
@@ -1,26 +0,0 @@
-/*
- * Copyright (c) 2020, Arm Limited. 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
- * }
- */
-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/sgm775/tsp/tsp-sgm775.mk b/plat/arm/board/sgm775/tsp/tsp-sgm775.mk
deleted file mode 100644
index 129b586..0000000
--- a/plat/arm/board/sgm775/tsp/tsp-sgm775.mk
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
-#
-# SPDX-License-Identifier: BSD-3-Clause
-#
-
-include plat/arm/css/sgm/tsp/tsp-sgm.mk
\ No newline at end of file
diff --git a/plat/arm/css/sgm/aarch64/css_sgm_helpers.S b/plat/arm/css/sgm/aarch64/css_sgm_helpers.S
deleted file mode 100644
index 32ca1bb..0000000
--- a/plat/arm/css/sgm/aarch64/css_sgm_helpers.S
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <arch.h>
-#include <asm_macros.S>
-#include <platform_def.h>
-#include <cortex_a75.h>
-#include <cortex_a55.h>
-#include <cpu_macros.S>
-
-	.globl	plat_arm_calc_core_pos
-	.globl	plat_reset_handler
-
-	/* ---------------------------------------------------------------------
-	 * unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
-	 *
-	 * Function to calculate the core position on FVP.
-	 *
-	 * (ClusterId * MAX_CPUS_PER_CLUSTER * MAX_PE_PER_CPU) +
-	 * (CPUId * MAX_PE_PER_CPU) +
-	 * ThreadId
-	 *
-	 * which can be simplified as:
-	 *
-	 * ((ClusterId * MAX_CPUS_PER_CLUSTER + CPUId) * MAX_PE_PER_CPU)
-	 * + ThreadId
-	 * ---------------------------------------------------------------------
-	 */
-func plat_arm_calc_core_pos
-	/*
-	 * Check for MT bit in MPIDR. If not set, shift MPIDR to left to make it
-	 * look as if in a multi-threaded implementation.
-	 */
-	tst	x0, #MPIDR_MT_MASK
-	lsr	x3, x0, #MPIDR_AFFINITY_BITS
-	csel	x3, x3, x0, eq
-
-	/* 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, #PLAT_MAX_CPUS_PER_CLUSTER
-	madd	x1, x2, x4, x1
-	mov	x5, #PLAT_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_A75_MIDR, A75
-	jump_if_cpu_midr CORTEX_A55_MIDR, A55
-	ret
-
-	/* -----------------------------------------------------
-	 * Disable CPU power down bit in power control register
-	 * -----------------------------------------------------
-	 */
-A75:
-	mrs	x0, CORTEX_A75_CPUPWRCTLR_EL1
-	bic	x0, x0, #CORTEX_A75_CORE_PWRDN_EN_MASK
-	msr	CORTEX_A75_CPUPWRCTLR_EL1, x0
-	isb
-	ret
-A55:
-	mrs	x0, CORTEX_A55_CPUPWRCTLR_EL1
-	bic	x0, x0, #CORTEX_A55_CORE_PWRDN_EN_MASK
-	msr	CORTEX_A55_CPUPWRCTLR_EL1, x0
-	isb
-	ret
-endfunc plat_reset_handler
diff --git a/plat/arm/css/sgm/fdts/sgm_tb_fw_config.dts b/plat/arm/css/sgm/fdts/sgm_tb_fw_config.dts
deleted file mode 100644
index 54b2423..0000000
--- a/plat/arm/css/sgm/fdts/sgm_tb_fw_config.dts
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- * Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-/dts-v1/;
-
-/ {
-	/* Platform Config */
-	tb_fw-config {
-		compatible = "arm,tb_fw";
-		hw_config_addr = <0x0 0x83000000>;
-		hw_config_max_size = <0x01000000>;
-		/*
-		 * The following two entries are placeholders for Mbed TLS
-		 * heap information. The default values don't matter since
-		 * they will be overwritten by BL1.
-		 * In case of having shared Mbed TLS heap between BL1 and BL2,
-		 * BL1 will populate these two properties with the respective
-		 * info about the shared heap. This info will be available for
-		 * BL2 in order to locate and re-use the heap.
-		 */
-		mbedtls_heap_addr = <0x0 0x0>;
-		mbedtls_heap_size = <0x0>;
-	};
-};
diff --git a/plat/arm/css/sgm/include/plat_macros.S b/plat/arm/css/sgm/include/plat_macros.S
deleted file mode 100644
index 715ded2..0000000
--- a/plat/arm/css/sgm/include/plat_macros.S
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * 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 <cci_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
-print_cci_regs
-.endm
-
-#endif /* PLAT_MACROS_S */
diff --git a/plat/arm/css/sgm/include/sgm_base_platform_def.h b/plat/arm/css/sgm/include/sgm_base_platform_def.h
deleted file mode 100644
index 2d8e677..0000000
--- a/plat/arm/css/sgm/include/sgm_base_platform_def.h
+++ /dev/null
@@ -1,242 +0,0 @@
-/*
- * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#ifndef SGM_BASE_PLATFORM_DEF_H
-#define SGM_BASE_PLATFORM_DEF_H
-
-#include <drivers/arm/tzc400.h>
-#include <drivers/arm/tzc_common.h>
-#include <plat/arm/board/common/board_css_def.h>
-#include <plat/arm/board/common/v2m_def.h>
-#include <plat/arm/common/arm_def.h>
-#include <plat/arm/css/common/css_def.h>
-#include <plat/arm/soc/common/soc_css_def.h>
-#include <plat/common/common_def.h>
-
-/* CPU topology */
-#define PLAT_ARM_CLUSTER_COUNT		U(1)
-#define PLAT_ARM_CLUSTER_CORE_COUNT	U(8)
-#define PLATFORM_CORE_COUNT		PLAT_ARM_CLUSTER_CORE_COUNT
-
-#define PLAT_MAX_PWR_LVL		ARM_PWR_LVL2
-#define PLAT_NUM_PWR_DOMAINS		(ARM_SYSTEM_COUNT + \
-					PLAT_ARM_CLUSTER_COUNT + \
-					PLATFORM_CORE_COUNT)
-
-/*
- * 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) \
-			CSS_G1S_IRQ_PROPS(grp), \
-			ARM_G1S_IRQ_PROPS(grp)
-
-#define PLAT_ARM_G0_IRQ_PROPS(grp)	ARM_G0_IRQ_PROPS(grp)
-
-/* GIC related constants */
-#define PLAT_ARM_GICD_BASE		0x30000000
-#define PLAT_ARM_GICR_BASE		0x300C0000
-#define PLAT_ARM_GICC_BASE		0x2c000000
-
-#define CSS_GIC_SIZE			0x00200000
-
-#define CSS_MAP_GIC_DEVICE		MAP_REGION_FLAT(	\
-					PLAT_ARM_GICD_BASE,	\
-					CSS_GIC_SIZE,		\
-					MT_DEVICE | MT_RW | MT_SECURE)
-
-/* Platform ID address */
-#define SSC_VERSION                     (SSC_REG_BASE + SSC_VERSION_OFFSET)
-#ifndef __ASSEMBLER__
-/* SSC_VERSION related accessors */
-/* Returns the part number of the platform */
-#define GET_PLAT_PART_NUM                                       \
-		GET_SSC_VERSION_PART_NUM(mmio_read_32(SSC_VERSION))
-/* Returns the configuration number of the platform */
-#define GET_PLAT_CONFIG_NUM                                     \
-		GET_SSC_VERSION_CONFIG(mmio_read_32(SSC_VERSION))
-#endif /* __ASSEMBLER__ */
-
-
-/*************************************************************************
- * Definitions common to all SGM CSS based platforms
- *************************************************************************/
-
-/* TZC-400 related constants */
-#define PLAT_ARM_TZC_BASE		0x2a500000
-#define TZC_NSAID_ALL_AP		0  /* Note: Same as default NSAID!! */
-#define TZC_NSAID_HDLCD0		2
-#define TZC_NSAID_HDLCD1		3
-#define TZC_NSAID_GPU			9
-#define TZC_NSAID_VIDEO			10
-#define TZC_NSAID_DISP0			11
-#define TZC_NSAID_DISP1			12
-
-
-/*************************************************************************
- * Required platform porting definitions common to all SGM CSS based
- * platforms
- *************************************************************************/
-
-#define PLAT_ARM_TRUSTED_SRAM_SIZE	0x00040000	/* 256 KB */
-
-/* MHU related constants */
-#define PLAT_CSS_MHU_BASE		0x2b1f0000
-
-#define PLAT_ARM_TRUSTED_ROM_BASE	0x00000000
-#define PLAT_ARM_TRUSTED_ROM_SIZE	0x00080000
-
-#define PLAT_ARM_CCI_BASE		0x2a000000
-
-/* Cluster to CCI slave mapping */
-#define PLAT_ARM_CCI_CLUSTER0_SL_IFACE_IX	6
-#define PLAT_ARM_CCI_CLUSTER1_SL_IFACE_IX	5
-
-/* System timer related constants */
-#define PLAT_ARM_NSTIMER_FRAME_ID	0
-
-/* TZC related constants */
-#define PLAT_ARM_TZC_NS_DEV_ACCESS	(				\
-		TZC_REGION_ACCESS_RDWR(TZC_NSAID_ALL_AP)	|	\
-		TZC_REGION_ACCESS_RDWR(TZC_NSAID_HDLCD0)	|	\
-		TZC_REGION_ACCESS_RDWR(TZC_NSAID_HDLCD1)	|	\
-		TZC_REGION_ACCESS_RDWR(TZC_NSAID_GPU)	|	\
-		TZC_REGION_ACCESS_RDWR(TZC_NSAID_VIDEO)	|	\
-		TZC_REGION_ACCESS_RDWR(TZC_NSAID_DISP0)	|	\
-		TZC_REGION_ACCESS_RDWR(TZC_NSAID_DISP1))
-
-/* Display Processor register definitions to setup the NSAIDs */
-#define MALI_DP_BASE           0x2cc00000
-#define DP_NPROT_NSAID_OFFSET     0x1000c
-#define W_NPROT_NSAID_SHIFT            24
-#define LS_NPORT_NSAID_SHIFT           12
-
-/*
- * Base address of the first memory region used for communication between AP
- * and SCP. Used by the BootOverMHU and SCPI protocols.
- */
-#if !CSS_USE_SCMI_SDS_DRIVER
-/*
- * Note that this is located at the same address as SCP_BOOT_CFG_ADDR, which
- * means the SCP/AP configuration data gets overwritten when the AP initiates
- * communication with the SCP. The configuration data is expected to be a
- * 32-bit word on all CSS platforms. Part of this configuration is
- * which CPU is the primary, according to the shift and mask definitions below.
- */
-#define PLAT_CSS_SCP_COM_SHARED_MEM_BASE	(ARM_TRUSTED_SRAM_BASE + 0x80)
-#define PLAT_CSS_PRIMARY_CPU_SHIFT		8
-#define PLAT_CSS_PRIMARY_CPU_BIT_WIDTH		4
-#endif
-
-/*
- * SCP_BL2 uses up whatever remaining space is available as it is loaded before
- * anything else in this memory region and is handed over to the SCP before
- * BL31 is loaded over the top.
- */
-#define PLAT_CSS_MAX_SCP_BL2_SIZE \
-	((SCP_BL2_LIMIT - ARM_FW_CONFIG_LIMIT) & ~PAGE_SIZE_MASK)
-
-#define PLAT_CSS_MAX_SCP_BL2U_SIZE	PLAT_CSS_MAX_SCP_BL2_SIZE
-
-/*
- * Most platform porting definitions provided by included headers
- */
-
-/*
- * PLAT_ARM_MMAP_ENTRIES depends on the number of entries in the
- * plat_arm_mmap array defined for each BL stage.
- */
-#if defined(IMAGE_BL31)
-# define PLAT_ARM_MMAP_ENTRIES		8
-# define MAX_XLAT_TABLES		5
-#elif defined(IMAGE_BL32)
-# define PLAT_ARM_MMAP_ENTRIES		8
-# define MAX_XLAT_TABLES		5
-#elif !USE_ROMLIB
-# define PLAT_ARM_MMAP_ENTRIES		11
-# define MAX_XLAT_TABLES		5
-#else
-# define PLAT_ARM_MMAP_ENTRIES		12
-# define MAX_XLAT_TABLES		6
-#endif
-
-/*
- * PLAT_ARM_MAX_BL1_RW_SIZE is calculated using the current BL1 RW debug size
- * plus a little space for growth.
- */
-#define PLAT_ARM_MAX_BL1_RW_SIZE	0xB000
-
-/*
- * PLAT_ARM_MAX_ROMLIB_RW_SIZE is define to use a full page
- */
-
-#if USE_ROMLIB
-#define PLAT_ARM_MAX_ROMLIB_RW_SIZE	0x1000
-#define PLAT_ARM_MAX_ROMLIB_RO_SIZE	0xe000
-#else
-#define PLAT_ARM_MAX_ROMLIB_RW_SIZE	0
-#define PLAT_ARM_MAX_ROMLIB_RO_SIZE	0
-#endif
-
-/*
- * PLAT_ARM_MAX_BL2_SIZE is calculated using the current BL2 debug size plus a
- * little space for growth.
- */
-#if TRUSTED_BOARD_BOOT
-# define PLAT_ARM_MAX_BL2_SIZE		0x1D000
-#else
-# define PLAT_ARM_MAX_BL2_SIZE		0x12000
-#endif
-
-/*
- * Since BL31 NOBITS overlays BL2 and BL1-RW, PLAT_ARM_MAX_BL31_SIZE is
- * calculated using the current BL31 PROGBITS debug size plus the sizes of
- * BL2 and BL1-RW
- */
-#define PLAT_ARM_MAX_BL31_SIZE		0x3B000
-
-/*
- * Size of cacheable stacks
- */
-#if defined(IMAGE_BL1)
-# if TRUSTED_BOARD_BOOT
-#  define PLATFORM_STACK_SIZE 0x1000
-# else
-#  define PLATFORM_STACK_SIZE 0x440
-# endif
-#elif defined(IMAGE_BL2)
-# if TRUSTED_BOARD_BOOT
-#  define PLATFORM_STACK_SIZE 0x1000
-# else
-#  define PLATFORM_STACK_SIZE 0x400
-# endif
-#elif defined(IMAGE_BL2U)
-# define PLATFORM_STACK_SIZE 0x400
-#elif defined(IMAGE_BL31)
-# define PLATFORM_STACK_SIZE 0x400
-#elif defined(IMAGE_BL32)
-# define PLATFORM_STACK_SIZE 0x440
-#endif
-
-/*******************************************************************************
- * Memprotect definitions
- ******************************************************************************/
-/* PSCI memory protect definitions:
- * This variable is stored in a non-secure flash because some ARM reference
- * platforms do not have secure NVRAM. Real systems that provided MEM_PROTECT
- * support must use a secure NVRAM to store the PSCI MEM_PROTECT definitions.
- */
-#define PLAT_ARM_MEM_PROT_ADDR		(V2M_FLASH0_BASE + \
-					 V2M_FLASH0_SIZE - V2M_FLASH_BLOCK_SIZE)
-
-/* System power domain level */
-#define CSS_SYSTEM_PWR_DMN_LVL		ARM_PWR_LVL2
-
-/* Number of SCMI channels on the platform */
-#define PLAT_ARM_SCMI_CHANNEL_COUNT	U(1)
-
-#endif /* SGM_BASE_PLATFORM_DEF_H */
diff --git a/plat/arm/css/sgm/include/sgm_plat_config.h b/plat/arm/css/sgm/include/sgm_plat_config.h
deleted file mode 100644
index 29b98d4..0000000
--- a/plat/arm/css/sgm/include/sgm_plat_config.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#ifndef SGM_PLAT_CONFIG_H
-#define SGM_PLAT_CONFIG_H
-
-#include <drivers/arm/ccn.h>
-#include <drivers/arm/gicv3.h>
-
-/* The type of interconnect */
-typedef enum {
-	ARM_CCI = 0,
-	ARM_CCN,
-	ARM_CMN
-} css_inteconn_type_t;
-
-typedef ccn_desc_t inteconn_desc_t;
-
-/* Interconnect configurations */
-typedef struct css_inteconn_config {
-	css_inteconn_type_t ip_type;
-	const inteconn_desc_t *plat_inteconn_desc;
-} css_inteconn_config_t;
-
-/* Topology configurations */
-typedef struct css_topology {
-	const unsigned char *power_tree;
-	unsigned int plat_cluster_core_count;
-} css_topology_t;
-
-typedef struct css_plat_config {
-	const gicv3_driver_data_t *gic_data;
-	const css_inteconn_config_t *inteconn;
-	const css_topology_t *topology;
-} css_plat_config_t;
-
-void plat_config_init(void);
-css_plat_config_t *get_plat_config(void);
-
-#endif /* SGM_PLAT_CONFIG_H */
diff --git a/plat/arm/css/sgm/include/sgm_variant.h b/plat/arm/css/sgm/include/sgm_variant.h
deleted file mode 100644
index 859ddb5..0000000
--- a/plat/arm/css/sgm/include/sgm_variant.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#ifndef SGM_VARIANT_H
-#define SGM_VARIANT_H
-
-/* SSC_VERSION values for sgm */
-#define SGM775_SSC_VER_PART_NUM		0x0790
-
-/* DMC configuration for sgm */
-#define SGM_DMC_SIZE			0x40000
-#define SGM775_DMC_COUNT		4
-
-#endif /* SGM_VARIANT_H */
diff --git a/plat/arm/css/sgm/sgm-common.mk b/plat/arm/css/sgm/sgm-common.mk
deleted file mode 100644
index 5b954f8..0000000
--- a/plat/arm/css/sgm/sgm-common.mk
+++ /dev/null
@@ -1,76 +0,0 @@
-#
-# Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
-#
-# SPDX-License-Identifier: BSD-3-Clause
-#
-
-CSS_USE_SCMI_SDS_DRIVER	:=	1
-
-CSS_SGM_BASE		:=	plat/arm/css/sgm
-
-PLAT_INCLUDES		:=	-I${CSS_SGM_BASE}/include
-
-PLAT_BL_COMMON_SOURCES	:=	${CSS_SGM_BASE}/sgm_mmap_config.c	\
-				${CSS_SGM_BASE}/aarch64/css_sgm_helpers.S
-
-SECURITY_SOURCES	:=	drivers/arm/tzc/tzc_dmc500.c		\
-				plat/arm/common/arm_tzc_dmc500.c	\
-				${CSS_SGM_BASE}/sgm_security.c
-
-SGM_CPU_SOURCES		:=	lib/cpus/aarch64/cortex_a55.S		\
-				lib/cpus/aarch64/cortex_a75.S
-
-INTERCONNECT_SOURCES	:=	${CSS_SGM_BASE}/sgm_interconnect.c
-
-# GIC-600 configuration
-GICV3_SUPPORT_GIC600	:=	1
-
-# Include GICv3 driver files
-include drivers/arm/gic/v3/gicv3.mk
-
-SGM_GIC_SOURCES		:=	${GICV3_SOURCES}			\
-				plat/common/plat_gicv3.c		\
-				plat/arm/common/arm_gicv3.c
-
-BL1_SOURCES		+=	$(SGM_CPU_SOURCES)			\
-				${INTERCONNECT_SOURCES}			\
-				${CSS_SGM_BASE}/sgm_bl1_setup.c		\
-				${CSS_SGM_BASE}/sgm_plat_config.c	\
-				drivers/arm/sp805/sp805.c
-
-BL2_SOURCES		+=	${SECURITY_SOURCES}			\
-				${CSS_SGM_BASE}/sgm_plat_config.c
-
-BL2U_SOURCES		+=	${SECURITY_SOURCES}
-
-BL31_SOURCES		+=	$(SGM_CPU_SOURCES)			\
-				${INTERCONNECT_SOURCES}			\
-				${SECURITY_SOURCES}			\
-				${SGM_GIC_SOURCES}			\
-				${CSS_SGM_BASE}/sgm_topology.c		\
-				${CSS_SGM_BASE}/sgm_bl31_setup.c	\
-				${CSS_SGM_BASE}/sgm_plat_config.c
-
-ifneq (${RESET_TO_BL31},0)
-  $(error "Using BL31 as the reset vector is not supported on ${PLAT} platform. \
-  Please set RESET_TO_BL31 to 0.")
-endif
-
-# sgm uses CCI-500 as Cache Coherent Interconnect
-ARM_CCI_PRODUCT_ID	:=	500
-
-# System coherency is managed in hardware
-HW_ASSISTED_COHERENCY	:=	1
-
-# When building for systems with hardware-assisted coherency, there's no need to
-# use USE_COHERENT_MEM. Require that USE_COHERENT_MEM must be set to 0 too.
-USE_COHERENT_MEM	:=	0
-
-override ARM_PLAT_MT	:=	1
-
-$(eval $(call add_define,SGM_PLAT))
-
-include plat/arm/common/arm_common.mk
-include plat/arm/board/common/board_common.mk
-include plat/arm/css/common/css_common.mk
-include plat/arm/soc/common/soc_css.mk
diff --git a/plat/arm/css/sgm/sgm_bl1_setup.c b/plat/arm/css/sgm/sgm_bl1_setup.c
deleted file mode 100644
index 5fd9655..0000000
--- a/plat/arm/css/sgm/sgm_bl1_setup.c
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <common/bl_common.h>
-#include <common/debug.h>
-#include <plat/arm/common/plat_arm.h>
-#include <plat/arm/soc/common/soc_css.h>
-#include <plat/arm/common/arm_def.h>
-#include <drivers/arm/sp805.h>
-#include <sgm_plat_config.h>
-
-void bl1_early_platform_setup(void)
-{
-
-	/* Initialize the console before anything else */
-	arm_bl1_early_platform_setup();
-
-	/* Initialize the platform configuration structure */
-	plat_config_init();
-
-#if !HW_ASSISTED_COHERENCY
-	/*
-	 * Initialize Interconnect for this cluster during cold boot.
-	 * No need for locks as no other CPU is active.
-	 */
-	plat_arm_interconnect_init();
-	/*
-	 * Enable Interconnect coherency for the primary CPU's cluster.
-	 */
-	plat_arm_interconnect_enter_coherency();
-#endif
-}
-
-void plat_arm_secure_wdt_start(void)
-{
-	sp805_start(ARM_SP805_TWDG_BASE, ARM_TWDG_LOAD_VAL);
-}
-
-void plat_arm_secure_wdt_stop(void)
-{
-	sp805_stop(ARM_SP805_TWDG_BASE);
-}
diff --git a/plat/arm/css/sgm/sgm_bl31_setup.c b/plat/arm/css/sgm/sgm_bl31_setup.c
deleted file mode 100644
index 907e9fd..0000000
--- a/plat/arm/css/sgm/sgm_bl31_setup.c
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <common/bl_common.h>
-#include <common/debug.h>
-#include <drivers/arm/css/css_mhu_doorbell.h>
-#include <drivers/arm/css/scmi.h>
-#include <plat/arm/common/plat_arm.h>
-
-#include <sgm_plat_config.h>
-
-static scmi_channel_plat_info_t sgm775_scmi_plat_info = {
-		.scmi_mbx_mem = CSS_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(int channel_id)
-{
-	return &sgm775_scmi_plat_info;
-}
-
-void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
-				u_register_t arg2, u_register_t arg3)
-{
-	uint32_t plat_version;
-	bl_params_node_t *bl_params;
-
-	bl_params = ((bl_params_t *)arg0)->head;
-
-	/* Initialize the platform configuration structure */
-	plat_config_init();
-
-	while (bl_params) {
-		if (bl_params->image_id == BL33_IMAGE_ID) {
-			plat_version = mmio_read_32(SSC_VERSION);
-			bl_params->ep_info->args.arg2 = plat_version;
-			break;
-		}
-
-		bl_params = bl_params->next_params_info;
-	}
-
-	arm_bl31_early_platform_setup((void *)arg0, arg1, arg2, (void *)arg3);
-}
-
-const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
-{
-	return css_scmi_override_pm_ops(ops);
-}
diff --git a/plat/arm/css/sgm/sgm_interconnect.c b/plat/arm/css/sgm/sgm_interconnect.c
deleted file mode 100644
index 5b45341..0000000
--- a/plat/arm/css/sgm/sgm_interconnect.c
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <cdefs.h>
-
-/*
- * As the SGM platform supports 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 __init 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/css/sgm/sgm_mmap_config.c b/plat/arm/css/sgm/sgm_mmap_config.c
deleted file mode 100644
index e5b4b03..0000000
--- a/plat/arm/css/sgm/sgm_mmap_config.c
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <platform_def.h>
-
-#include <common/bl_common.h>
-#include <common/debug.h>
-#include <plat/arm/common/plat_arm.h>
-
-#include <sgm_variant.h>
-
-/*
- * Table of regions for different BL stages to map using the MMU.
- * This doesn't include Trusted RAM as the 'mem_layout' argument passed to
- * arm_configure_mmu_elx() will give the available subset of that.
- */
-#if IMAGE_BL1
-const mmap_region_t plat_arm_mmap[] = {
-	ARM_MAP_SHARED_RAM,
-	V2M_MAP_FLASH0_RO,
-	V2M_MAP_IOFPGA,
-	CSS_MAP_DEVICE,
-	CSS_MAP_GIC_DEVICE,
-	SOC_CSS_MAP_DEVICE,
-#if TRUSTED_BOARD_BOOT
-	ARM_MAP_NS_DRAM1,
-#endif
-	{0}
-};
-#endif
-#if IMAGE_BL2
-const mmap_region_t plat_arm_mmap[] = {
-	ARM_MAP_SHARED_RAM,
-	V2M_MAP_FLASH0_RO,
-	V2M_MAP_IOFPGA,
-	CSS_MAP_DEVICE,
-	CSS_MAP_GIC_DEVICE,
-	SOC_CSS_MAP_DEVICE,
-	ARM_MAP_NS_DRAM1,
-#ifdef SPD_tspd
-	ARM_MAP_TSP_SEC_MEM,
-#endif
-#ifdef SPD_opteed
-	ARM_OPTEE_PAGEABLE_LOAD_MEM,
-#endif
-#if TRUSTED_BOARD_BOOT && !BL2_AT_EL3
-	ARM_MAP_BL1_RW,
-#endif
-	{0}
-};
-#endif
-#if IMAGE_BL2U
-const mmap_region_t plat_arm_mmap[] = {
-	ARM_MAP_SHARED_RAM,
-	CSS_MAP_DEVICE,
-	CSS_MAP_GIC_DEVICE,
-	SOC_CSS_MAP_DEVICE,
-	{0}
-};
-#endif
-#if IMAGE_BL31
-const mmap_region_t plat_arm_mmap[] = {
-	ARM_MAP_SHARED_RAM,
-	V2M_MAP_IOFPGA,
-	CSS_MAP_DEVICE,
-	CSS_MAP_GIC_DEVICE,
-	SOC_CSS_MAP_DEVICE,
-	{0}
-};
-#endif
-#if IMAGE_BL32
-const mmap_region_t plat_arm_mmap[] = {
-	V2M_MAP_IOFPGA,
-	CSS_MAP_DEVICE,
-	CSS_MAP_GIC_DEVICE,
-	SOC_CSS_MAP_DEVICE,
-	{0}
-};
-#endif
-
-ARM_CASSERT_MMAP
-
-const mmap_region_t *plat_arm_get_mmap(void)
-{
-	return plat_arm_mmap;
-}
diff --git a/plat/arm/css/sgm/sgm_plat_config.c b/plat/arm/css/sgm/sgm_plat_config.c
deleted file mode 100644
index eed3631..0000000
--- a/plat/arm/css/sgm/sgm_plat_config.c
+++ /dev/null
@@ -1,80 +0,0 @@
-/*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <assert.h>
-#include <string.h>
-
-#include <platform_def.h>
-
-#include <common/debug.h>
-#include <plat/common/platform.h>
-#include <plat/arm/common/plat_arm.h>
-
-#include <sgm_plat_config.h>
-#include <sgm_variant.h>
-
-static css_plat_config_t *css_plat_info;
-
-/* Interconnect */
-const css_inteconn_config_t sgm_inteconn = {
-	.ip_type = ARM_CCI,
-	.plat_inteconn_desc = NULL
-};
-
-/* Special definition for SGM775 */
-/* Topology configuration for SGM775 */
-const unsigned char sgm775_power_domain_tree_desc[] = {
-	/* No of root nodes */
-	ARM_SYSTEM_COUNT,
-	/* No of children for the root node */
-	PLAT_ARM_CLUSTER_COUNT,
-	/* No of children for the first cluster node */
-	PLAT_ARM_CLUSTER_CORE_COUNT,
-};
-
-const css_topology_t sgm775_topology = {
-	.power_tree = sgm775_power_domain_tree_desc,
-	.plat_cluster_core_count = PLAT_ARM_CLUSTER_CORE_COUNT
-};
-
-/* Configuration structure for SGM775 */
-css_plat_config_t sgm775_config = {
-	.inteconn = &sgm_inteconn,
-	.topology = &sgm775_topology
-};
-
-/*******************************************************************************
- * This function initializes the platform structure.
- ******************************************************************************/
-void plat_config_init(void)
-{
-	/* Get the platform configurations */
-	switch (GET_PLAT_PART_NUM) {
-	case SGM775_SSC_VER_PART_NUM:
-		css_plat_info = &sgm775_config;
-
-		break;
-	default:
-		ERROR("Not a valid sgm variant!\n");
-		panic();
-	}
-}
-
-/*******************************************************************************
- * This function returns the platform structure pointer.
- ******************************************************************************/
-css_plat_config_t *get_plat_config(void)
-{
-	assert(css_plat_info != NULL);
-	return css_plat_info;
-}
-
-#if TRUSTED_BOARD_BOOT
-int plat_get_mbedtls_heap(void **heap_addr, size_t *heap_size)
-{
-	return get_mbedtls_heap_helper(heap_addr, heap_size);
-}
-#endif
diff --git a/plat/arm/css/sgm/sgm_security.c b/plat/arm/css/sgm/sgm_security.c
deleted file mode 100644
index 21d5306..0000000
--- a/plat/arm/css/sgm/sgm_security.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <common/debug.h>
-#include <drivers/arm/tzc_dmc500.h>
-#include <plat/arm/common/plat_arm.h>
-#include <plat/arm/soc/common/soc_css.h>
-
-#include <sgm_variant.h>
-
-/* Is populated with the DMC-500 controllers base addresses */
-static tzc_dmc500_driver_data_t plat_driver_data;
-
-void plat_sgm_dp_security_setup(void)
-{
-	unsigned int nprot_nsaid;
-
-	/*
-	 * At reset the Mali display processors start with NSAIDs set to zero
-	 * so the firmware must set them up to the expected values for ARM sgm
-	 * platforms.
-	 */
-
-	nprot_nsaid = mmio_read_32(MALI_DP_BASE + DP_NPROT_NSAID_OFFSET);
-	nprot_nsaid &= ~((0xF << W_NPROT_NSAID_SHIFT) |
-			(0xF << LS_NPORT_NSAID_SHIFT));
-	nprot_nsaid |= ((TZC_NSAID_DISP1 << W_NPROT_NSAID_SHIFT) |
-			(TZC_NSAID_DISP0 << LS_NPORT_NSAID_SHIFT));
-	mmio_write_32(MALI_DP_BASE + DP_NPROT_NSAID_OFFSET, nprot_nsaid);
-}
-
-void plat_arm_security_setup(void)
-{
-	unsigned int i;
-	unsigned int part_num = GET_PLAT_PART_NUM;
-
-	INFO("part_num: 0x%x\n", part_num);
-
-	/*
-	 * Initialise plat_driver_data with platform specific DMC_BASE
-	 * addresses
-	 */
-	switch (part_num) {
-	case SGM775_SSC_VER_PART_NUM:
-		for (i = 0; i < SGM775_DMC_COUNT; i++)
-			plat_driver_data.dmc_base[i] = PLAT_ARM_TZC_BASE
-					+ SGM_DMC_SIZE * i;
-		plat_driver_data.dmc_count = SGM775_DMC_COUNT;
-		break;
-	default:
-		/* Unexpected platform */
-		ERROR("Unexpected platform\n");
-		panic();
-	}
-	/* Initialize the TrustZone Controller in DMC-500 */
-	arm_tzc_dmc500_setup(&plat_driver_data, NULL);
-
-	/* Do DP NSAID setup */
-	plat_sgm_dp_security_setup();
-	/* Do ARM CSS SoC security setup */
-	soc_css_security_setup();
-}
diff --git a/plat/arm/css/sgm/sgm_topology.c b/plat/arm/css/sgm/sgm_topology.c
deleted file mode 100644
index 2d9552d..0000000
--- a/plat/arm/css/sgm/sgm_topology.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <plat/arm/common/plat_arm.h>
-
-#include <sgm_plat_config.h>
-
-/*******************************************************************************
- * This function returns the topology tree information.
- ******************************************************************************/
-const unsigned char *plat_get_power_domain_tree_desc(void)
-{
-	return get_plat_config()->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 get_plat_config()->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, 4, 5, 6, 7 };
diff --git a/plat/arm/css/sgm/tsp/sgm_tsp_setup.c b/plat/arm/css/sgm/tsp/sgm_tsp_setup.c
deleted file mode 100644
index 5f40c4c..0000000
--- a/plat/arm/css/sgm/tsp/sgm_tsp_setup.c
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <plat/arm/common/plat_arm.h>
-
-#include <sgm_plat_config.h>
-
-void tsp_early_platform_setup(void)
-{
-	/* Initialize the platform configuration structure */
-	plat_config_init();
-
-	arm_tsp_early_platform_setup();
-}
diff --git a/plat/arm/css/sgm/tsp/tsp-sgm.mk b/plat/arm/css/sgm/tsp/tsp-sgm.mk
deleted file mode 100644
index de5e5b7..0000000
--- a/plat/arm/css/sgm/tsp/tsp-sgm.mk
+++ /dev/null
@@ -1,11 +0,0 @@
-#
-# Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
-#
-# SPDX-License-Identifier: BSD-3-Clause
-#
-
-BL32_SOURCES		+= 	${SGM_GIC_SOURCES}			\
-				${CSS_SGM_BASE}/sgm_plat_config.c	\
-				plat/arm/css/sgm/tsp/sgm_tsp_setup.c
-
-include plat/arm/common/tsp/arm_tsp.mk