diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index 043af63..6031dd9 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -669,9 +669,10 @@
    SCP\_BL2U to the FIP and FWU\_FIP respectively, and enables them to be loaded
    during boot. Default is 1.
 
--  ``CSS_USE_SCMI_DRIVER``: Boolean flag which selects SCMI driver instead of
-   SCPI driver for communicating with the SCP during power management operations.
-   If this option is set to 1, then SCMI driver will be used. Default is 0.
+-  ``CSS_USE_SCMI_SDS_DRIVER``: Boolean flag which selects SCMI/SDS drivers
+   instead of SCPI/BOM driver for communicating with the SCP during power
+   management operations and for SCP RAM Firmware transfer. If this option
+   is set to 1, then SCMI/SDS drivers will be used. Default is 0.
 
 ARM FVP platform specific build options
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index 9d025f6..ac0769c 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -37,6 +37,9 @@
 #define CSS_IRQ_TZ_WDOG			86
 #define CSS_IRQ_SEC_SYS_TIMER		91
 
+/* MHU register offsets */
+#define MHU_CPU_INTR_S_SET_OFFSET	0x308
+
 /*
  * Define a list of Group 1 Secure interrupts as per GICv3 terminology. On a
  * GICv2 system or mode, the interrupts will be treated as Group 0 interrupts.
@@ -47,17 +50,24 @@
 					CSS_IRQ_TZ_WDOG,	\
 					CSS_IRQ_SEC_SYS_TIMER
 
+#if CSS_USE_SCMI_SDS_DRIVER
+/* Memory region for shared data storage */
+#define PLAT_ARM_SDS_MEM_BASE		ARM_SHARED_RAM_BASE
+#define PLAT_ARM_SDS_MEM_SIZE_MAX	0xDC0 /* 3520 bytes */
 /*
- * The lower Non-secure MHU channel is being used for SCMI for ARM Trusted
- * Firmware.
- * TODO: Move SCMI to Secure channel once the migration to SCMI in SCP is
- * complete.
+ * The SCMI Channel is placed right after the SDS region
  */
-#define MHU_CPU_INTR_L_SET_OFFSET	0x108
-#define MHU_CPU_INTR_H_SET_OFFSET	0x128
-#define CSS_SCMI_PAYLOAD_BASE		(NSRAM_BASE + 0x500)
-#define CSS_SCMI_MHU_DB_REG_OFF		MHU_CPU_INTR_L_SET_OFFSET
+#define CSS_SCMI_PAYLOAD_BASE		(PLAT_ARM_SDS_MEM_BASE + PLAT_ARM_SDS_MEM_SIZE_MAX)
+#define CSS_SCMI_MHU_DB_REG_OFF		MHU_CPU_INTR_S_SET_OFFSET
+
+/* Trusted mailbox base address common to all CSS */
+/* If SDS is present, then mailbox is at top of SRAM */
+#define PLAT_ARM_TRUSTED_MAILBOX_BASE	(ARM_SHARED_RAM_BASE + ARM_SHARED_RAM_SIZE - 0x8)
 
+/* Number of retries for SCP_RAM_READY flag */
+#define CSS_SCP_READY_10US_RETRIES		1000000 /* Effective timeout of 10000 ms */
+
+#else
 /*
  * SCP <=> AP boot configuration
  *
@@ -69,6 +79,12 @@
  */
 #define SCP_BOOT_CFG_ADDR		PLAT_CSS_SCP_COM_SHARED_MEM_BASE
 
+/* Trusted mailbox base address common to all CSS */
+/* If SDS is not present, then the mailbox is at the bottom of SRAM */
+#define PLAT_ARM_TRUSTED_MAILBOX_BASE	ARM_TRUSTED_SRAM_BASE
+
+#endif /* CSS_USE_SCMI_SDS_DRIVER */
+
 #define CSS_MAP_DEVICE			MAP_REGION_FLAT(		\
 						CSS_DEVICE_BASE,	\
 						CSS_DEVICE_SIZE,	\
@@ -152,9 +168,6 @@
 /* TZC related constants */
 #define PLAT_ARM_TZC_FILTERS		TZC_400_REGION_ATTR_FILTER_BIT_ALL
 
-/* Trusted mailbox base address common to all CSS */
-#define PLAT_ARM_TRUSTED_MAILBOX_BASE	ARM_TRUSTED_SRAM_BASE
-
 /*
  * Parsing of CPU and Cluster states, as returned by 'Get CSS Power State' SCP
  * command
diff --git a/plat/arm/board/common/board_css_common.c b/plat/arm/board/common/board_css_common.c
index 68f70a7..159bf86 100644
--- a/plat/arm/board/common/board_css_common.c
+++ b/plat/arm/board/common/board_css_common.c
@@ -56,15 +56,6 @@
 	ARM_MAP_SHARED_RAM,
 	V2M_MAP_IOFPGA,
 	CSS_MAP_DEVICE,
-#if CSS_USE_SCMI_DRIVER
-	/*
-	 * The SCMI payload area is currently in the Non Secure SRAM. This is
-	 * a potential security risk but this will be resolved once SCP
-	 * completely replaces SCPI with SCMI as the only communication
-	 * protocol.
-	 */
-	CSS_MAP_NSRAM,
-#endif
 	SOC_CSS_MAP_DEVICE,
 	{0}
 };
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 0b6e1da..6d8aa5f 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -117,7 +117,6 @@
 
 
 BL2_SOURCES		+=	drivers/io/io_semihosting.c			\
-				drivers/delay_timer/delay_timer.c		\
 				lib/semihosting/semihosting.c			\
 				lib/semihosting/${ARCH}/semihosting_call.S	\
 				plat/arm/board/fvp/fvp_bl2_setup.c		\
@@ -128,8 +127,6 @@
 
 ifeq (${FVP_USE_SP804_TIMER},1)
 BL2_SOURCES		+=	drivers/arm/sp804/sp804_delay_timer.c
-else
-BL2_SOURCES		+=	drivers/delay_timer/generic_delay_timer.c
 endif
 
 BL2U_SOURCES		+=	plat/arm/board/fvp/fvp_bl2u_setup.c		\
diff --git a/plat/arm/board/juno/include/platform_def.h b/plat/arm/board/juno/include/platform_def.h
index 873c569..f1714e1 100644
--- a/plat/arm/board/juno/include/platform_def.h
+++ b/plat/arm/board/juno/include/platform_def.h
@@ -82,13 +82,8 @@
 #endif
 
 #ifdef IMAGE_BL31
-# if CSS_USE_SCMI_DRIVER
-#  define PLAT_ARM_MMAP_ENTRIES		6
-#  define MAX_XLAT_TABLES		3
-# else
 #  define PLAT_ARM_MMAP_ENTRIES		5
 #  define MAX_XLAT_TABLES		2
-# endif
 #endif
 
 #ifdef IMAGE_BL32
@@ -168,7 +163,9 @@
 /*
  * Base address of the first memory region used for communication between AP
  * and SCP. Used by the BOM 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
@@ -178,6 +175,7 @@
 #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
 
 /*
  * PLAT_CSS_MAX_SCP_BL2_SIZE is calculated using the current
diff --git a/plat/arm/board/juno/juno_bl2_setup.c b/plat/arm/board/juno/juno_bl2_setup.c
index abceb0f..2771e0f 100644
--- a/plat/arm/board/juno/juno_bl2_setup.c
+++ b/plat/arm/board/juno/juno_bl2_setup.c
@@ -30,9 +30,12 @@
 	return err;
 }
 
+#if !CSS_USE_SCMI_SDS_DRIVER
 /*
  * We need to override some of the platform functions when booting SP_MIN
- * on Juno AArch32.
+ * on Juno AArch32. These needs to be done only for SCPI/BOM SCP systems as
+ * in case of SDS, the structures remain in memory and doesn't need to be
+ * overwritten.
  */
 
 static unsigned int scp_boot_config;
@@ -53,4 +56,6 @@
 	mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config);
 	VERBOSE("BL2: Restored SCP Boot config = 0x%x\n", scp_boot_config);
 }
+#endif
+
 #endif /* JUNO_AARCH32_EL3_RUNTIME */
diff --git a/plat/arm/common/arm_bl2_setup.c b/plat/arm/common/arm_bl2_setup.c
index 9182bd1..cab6113 100644
--- a/plat/arm/common/arm_bl2_setup.c
+++ b/plat/arm/common/arm_bl2_setup.c
@@ -11,6 +11,7 @@
 #include <console.h>
 #include <debug.h>
 #include <desc_image_load.h>
+#include <generic_delay_timer.h>
 #ifdef SPD_opteed
 #include <optee_utils.h>
 #endif
@@ -182,6 +183,7 @@
 void bl2_early_platform_setup(meminfo_t *mem_layout)
 {
 	arm_bl2_early_platform_setup(mem_layout);
+	generic_delay_timer_init();
 }
 
 /*
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 20372c2..0e14806 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -139,7 +139,9 @@
 BL1_SOURCES		+=	plat/arm/common/arm_pm.c
 endif
 
-BL2_SOURCES		+=	drivers/io/io_fip.c				\
+BL2_SOURCES		+=	drivers/delay_timer/delay_timer.c		\
+				drivers/delay_timer/generic_delay_timer.c	\
+				drivers/io/io_fip.c				\
 				drivers/io/io_memmap.c				\
 				drivers/io/io_storage.c				\
 				plat/arm/common/arm_bl2_setup.c			\
@@ -159,7 +161,9 @@
 endif
 endif
 
-BL2U_SOURCES		+=	plat/arm/common/arm_bl2u_setup.c
+BL2U_SOURCES		+=	drivers/delay_timer/delay_timer.c		\
+				drivers/delay_timer/generic_delay_timer.c	\
+				plat/arm/common/arm_bl2u_setup.c
 
 BL31_SOURCES		+=	plat/arm/common/arm_bl31_setup.c		\
 				plat/arm/common/arm_pm.c			\
diff --git a/plat/arm/css/common/aarch32/css_helpers.S b/plat/arm/css/common/aarch32/css_helpers.S
index f131e67..80aa24c 100644
--- a/plat/arm/css/common/aarch32/css_helpers.S
+++ b/plat/arm/css/common/aarch32/css_helpers.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -68,9 +68,27 @@
 	 * cpu (applicable ony after a cold boot)
 	 * -----------------------------------------------------
 	 */
+#if CSS_USE_SCMI_SDS_DRIVER
 func plat_is_my_cpu_primary
 	mov	r10, lr
 	bl	plat_my_core_pos
+	mov	r4, r0
+	bl	sds_get_primary_cpu_id
+	/* Check for error */
+	mov	r1, #0xffffffff
+	cmp	r0, r1
+	beq	1f
+	cmp	r0, r4
+	moveq	r0, #1
+	movne	r0, #0
+	bx	r10
+1:
+	no_ret	plat_panic_handler
+endfunc plat_is_my_cpu_primary
+#else
+func plat_is_my_cpu_primary
+	mov	r10, lr
+	bl	plat_my_core_pos
 	ldr	r1, =SCP_BOOT_CFG_ADDR
 	ldr	r1, [r1]
 	ubfx	r1, r1, #PLAT_CSS_PRIMARY_CPU_SHIFT, \
@@ -80,3 +98,4 @@
 	movne	r0, #0
 	bx	r10
 endfunc plat_is_my_cpu_primary
+#endif
diff --git a/plat/arm/css/common/aarch64/css_helpers.S b/plat/arm/css/common/aarch64/css_helpers.S
index 0cf8f86..59d9206 100644
--- a/plat/arm/css/common/aarch64/css_helpers.S
+++ b/plat/arm/css/common/aarch64/css_helpers.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -88,9 +88,26 @@
 	 * cpu (applicable ony after a cold boot)
 	 * -----------------------------------------------------
 	 */
+#if CSS_USE_SCMI_SDS_DRIVER
 func plat_is_my_cpu_primary
 	mov	x9, x30
 	bl	plat_my_core_pos
+	mov	x4, x0
+	bl	sds_get_primary_cpu_id
+	/* Check for error */
+	mov	x1, #0xffffffff
+	cmp	x0, x1
+	b.eq	1f
+	cmp	x0, x4
+	cset	w0, eq
+	ret	x9
+1:
+	no_ret	plat_panic_handler
+endfunc plat_is_my_cpu_primary
+#else
+func plat_is_my_cpu_primary
+	mov	x9, x30
+	bl	plat_my_core_pos
 	ldr	x1, =SCP_BOOT_CFG_ADDR
 	ldr	x1, [x1]
 	ubfx	x1, x1, #PLAT_CSS_PRIMARY_CPU_SHIFT, \
@@ -99,3 +116,4 @@
 	cset	w0, eq
 	ret	x9
 endfunc plat_is_my_cpu_primary
+#endif
diff --git a/plat/arm/css/common/css_bl2_setup.c b/plat/arm/css/common/css_bl2_setup.c
index c98b2ff..9b4800e 100644
--- a/plat/arm/css/common/css_bl2_setup.c
+++ b/plat/arm/css/common/css_bl2_setup.c
@@ -48,10 +48,14 @@
 	return ret;
 }
 
-#ifdef EL3_PAYLOAD_BASE
+#if !CSS_USE_SCMI_SDS_DRIVER
+# ifdef EL3_PAYLOAD_BASE
+
 /*
  * We need to override some of the platform functions when booting an EL3
- * payload.
+ * payload. These needs to be done only for SCPI/BOM SCP systems as
+ * in case of SDS, the structures remain in memory and doesn't need to be
+ * overwritten.
  */
 
 static unsigned int scp_boot_config;
@@ -82,4 +86,7 @@
 	zeromem((void *) ARM_SHARED_RAM_BASE, 128);
 	mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config);
 }
-#endif /* EL3_PAYLOAD_BASE */
+
+# endif /* EL3_PAYLOAD_BASE */
+
+#endif /* CSS_USE_SCMI_SDS_DRIVER */
diff --git a/plat/arm/css/common/css_common.mk b/plat/arm/css/common/css_common.mk
index 9381e4c..63e3059 100644
--- a/plat/arm/css/common/css_common.mk
+++ b/plat/arm/css/common/css_common.mk
@@ -9,7 +9,7 @@
 CSS_LOAD_SCP_IMAGES	?=	1
 
 # By default, SCMI driver is disabled for CSS platforms
-CSS_USE_SCMI_DRIVER	?=	0
+CSS_USE_SCMI_SDS_DRIVER	?=	0
 
 PLAT_INCLUDES		+=	-Iinclude/plat/arm/css/common			\
 				-Iinclude/plat/arm/css/common/aarch64
@@ -19,18 +19,14 @@
 
 BL1_SOURCES		+=	plat/arm/css/common/css_bl1_setup.c
 
-BL2_SOURCES		+=	plat/arm/css/common/css_bl2_setup.c		\
-				plat/arm/css/drivers/scpi/css_mhu.c		\
-				plat/arm/css/drivers/scpi/css_scpi.c
+BL2_SOURCES		+=	plat/arm/css/common/css_bl2_setup.c
 
-BL2U_SOURCES		+=	plat/arm/css/common/css_bl2u_setup.c		\
-				plat/arm/css/drivers/scpi/css_mhu.c		\
-				plat/arm/css/drivers/scpi/css_scpi.c
+BL2U_SOURCES		+=	plat/arm/css/common/css_bl2u_setup.c
 
 BL31_SOURCES		+=	plat/arm/css/common/css_pm.c			\
 				plat/arm/css/common/css_topology.c
 
-ifeq (${CSS_USE_SCMI_DRIVER},0)
+ifeq (${CSS_USE_SCMI_SDS_DRIVER},0)
 BL31_SOURCES		+=	plat/arm/css/drivers/scp/css_pm_scpi.c		\
 				plat/arm/css/drivers/scpi/css_mhu.c		\
 				plat/arm/css/drivers/scpi/css_scpi.c
@@ -56,19 +52,34 @@
     $(eval $(call FWU_FIP_ADD_IMG,SCP_BL2U,--scp-fwu-cfg))
   endif
 
-  BL2U_SOURCES		+=	plat/arm/css/drivers/scp/css_bom_bootloader.c
-  BL2_SOURCES		+=	plat/arm/css/drivers/scp/css_bom_bootloader.c
-endif
+  ifeq (${CSS_USE_SCMI_SDS_DRIVER},1)
+    BL2U_SOURCES	+=	plat/arm/css/drivers/scp/css_sds.c	\
+				plat/arm/css/drivers/sds/sds.c
 
-# Enable option to detect whether the SCP ROM firmware in use predates version
-# 1.7.0 and therefore, is incompatible.
-CSS_DETECT_PRE_1_7_0_SCP	:=	1
+    BL2_SOURCES		+=	plat/arm/css/drivers/scp/css_sds.c	\
+				plat/arm/css/drivers/sds/sds.c
+  else
+    BL2U_SOURCES	+=	plat/arm/css/drivers/scp/css_bom_bootloader.c	\
+				plat/arm/css/drivers/scpi/css_mhu.c		\
+				plat/arm/css/drivers/scpi/css_scpi.c
 
-# Process CSS_DETECT_PRE_1_7_0_SCP flag
-$(eval $(call assert_boolean,CSS_DETECT_PRE_1_7_0_SCP))
-$(eval $(call add_define,CSS_DETECT_PRE_1_7_0_SCP))
+    BL2_SOURCES		+=	plat/arm/css/drivers/scp/css_bom_bootloader.c	\
+				plat/arm/css/drivers/scpi/css_mhu.c		\
+				plat/arm/css/drivers/scpi/css_scpi.c
+    # Enable option to detect whether the SCP ROM firmware in use predates version
+    # 1.7.0 and therefore, is incompatible.
+    CSS_DETECT_PRE_1_7_0_SCP	:=	1
+
+    # Process CSS_DETECT_PRE_1_7_0_SCP flag
+    $(eval $(call assert_boolean,CSS_DETECT_PRE_1_7_0_SCP))
+    $(eval $(call add_define,CSS_DETECT_PRE_1_7_0_SCP))
+  endif
+endif
 
-# Process CSS_USE_SCMI_DRIVER flag
-$(eval $(call assert_boolean,CSS_USE_SCMI_DRIVER))
-$(eval $(call add_define,CSS_USE_SCMI_DRIVER))
+ifeq (${CSS_USE_SCMI_SDS_DRIVER},1)
+  PLAT_BL_COMMON_SOURCES	+=	plat/arm/css/drivers/sds/${ARCH}/sds_helpers.S
+endif
 
+# Process CSS_USE_SCMI_SDS_DRIVER flag
+$(eval $(call assert_boolean,CSS_USE_SCMI_SDS_DRIVER))
+$(eval $(call add_define,CSS_USE_SCMI_SDS_DRIVER))
diff --git a/plat/arm/css/common/sp_min/css_sp_min.mk b/plat/arm/css/common/sp_min/css_sp_min.mk
index 7423d78..28eb2db 100644
--- a/plat/arm/css/common/sp_min/css_sp_min.mk
+++ b/plat/arm/css/common/sp_min/css_sp_min.mk
@@ -8,7 +8,7 @@
 BL32_SOURCES		+=	plat/arm/css/common/css_pm.c			\
 				plat/arm/css/common/css_topology.c
 
-ifeq (${CSS_USE_SCMI_DRIVER},0)
+ifeq (${CSS_USE_SCMI_SDS_DRIVER},0)
 BL32_SOURCES		+=	plat/arm/css/drivers/scp/css_pm_scpi.c		\
 				plat/arm/css/drivers/scpi/css_mhu.c		\
 				plat/arm/css/drivers/scpi/css_scpi.c
diff --git a/plat/arm/css/drivers/scp/css_bom_bootloader.c b/plat/arm/css/drivers/scp/css_bom_bootloader.c
index 047e069..a92ce6b 100644
--- a/plat/arm/css/drivers/scp/css_bom_bootloader.c
+++ b/plat/arm/css/drivers/scp/css_bom_bootloader.c
@@ -6,12 +6,12 @@
 
 #include <arch_helpers.h>
 #include <assert.h>
-#include <cassert.h>
 #include <css_def.h>
 #include <debug.h>
 #include <platform.h>
 #include <stdint.h>
 #include "../scpi/css_mhu.h"
+#include "../scpi/css_scpi.h"
 
 /* ID of the MHU slot used for the BOM protocol */
 #define BOM_MHU_SLOT_ID		0
@@ -183,3 +183,11 @@
 
 	return 0;
 }
+
+int css_scp_boot_ready(void)
+{
+	VERBOSE("Waiting for SCP to signal it is ready to go on\n");
+
+	/* Wait for SCP to signal it's ready */
+	return scpi_wait_ready();
+}
diff --git a/plat/arm/css/drivers/scp/css_pm_scmi.c b/plat/arm/css/drivers/scp/css_pm_scmi.c
index 9098d3f..c39bc4b 100644
--- a/plat/arm/css/drivers/scp/css_pm_scmi.c
+++ b/plat/arm/css/drivers/scp/css_pm_scmi.c
@@ -324,8 +324,8 @@
 scmi_channel_plat_info_t plat_css_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 = 0xfffffffd,
-		.db_modify_mask = 0x2,
+		.db_preserve_mask = 0xfffffffe,
+		.db_modify_mask = 0x1,
 };
 
 void plat_arm_pwrc_setup(void)
diff --git a/plat/arm/css/drivers/scp/css_scp.h b/plat/arm/css/drivers/scp/css_scp.h
index 097a9f5..223e372 100644
--- a/plat/arm/css/drivers/scp/css_scp.h
+++ b/plat/arm/css/drivers/scp/css_scp.h
@@ -7,8 +7,9 @@
 #ifndef __CSS_SCP_H__
 #define __CSS_SCP_H__
 
+#include <cassert.h>
+#include <platform_def.h>
 #include <types.h>
-#include "../scpi/css_scpi.h"
 
 /* Forward declarations */
 struct psci_power_state;
@@ -28,10 +29,20 @@
  * API to wait for SCP to signal till it's ready after booting the transferred
  * image.
  */
-static inline int css_scp_boot_ready(void)
-{
-	VERBOSE("Waiting for SCP to signal it is ready to go on\n");
-	return scpi_wait_ready();
-}
+int css_scp_boot_ready(void);
+
+#if CSS_LOAD_SCP_IMAGES
+/*
+ * All CSS platforms load SCP_BL2/SCP_BL2U just below BL rw-data and above
+ * BL2/BL2U (this is where BL31 usually resides except when ARM_BL31_IN_DRAM is
+ * set. Ensure that SCP_BL2/SCP_BL2U do not overflow into BL1 rw-data nor
+ * BL2/BL2U.
+ */
+CASSERT(SCP_BL2_LIMIT <= BL1_RW_BASE, assert_scp_bl2_limit_overwrite_bl1);
+CASSERT(SCP_BL2U_LIMIT <= BL1_RW_BASE, assert_scp_bl2u_limit_overwrite_bl1);
+
+CASSERT(SCP_BL2_BASE >= BL2_LIMIT, assert_scp_bl2_overwrite_bl2);
+CASSERT(SCP_BL2U_BASE >= BL2U_LIMIT, assert_scp_bl2u_overwrite_bl2u);
+#endif
 
 #endif	/* __CSS_SCP_H__ */
diff --git a/plat/arm/css/drivers/scp/css_sds.c b/plat/arm/css/drivers/scp/css_sds.c
new file mode 100644
index 0000000..a7a51ba
--- /dev/null
+++ b/plat/arm/css/drivers/scp/css_sds.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <css_def.h>
+#include <debug.h>
+#include <delay_timer.h>
+#include <platform.h>
+#include <stdint.h>
+#include "../sds/sds.h"
+
+int css_scp_boot_image_xfer(void *image, unsigned int image_size)
+{
+	int ret;
+	unsigned int image_offset, image_flags;
+
+	ret = sds_init();
+	if (ret != SDS_OK) {
+		ERROR("SCP SDS initialization failed\n");
+		panic();
+	}
+
+	VERBOSE("Writing SCP image metadata\n");
+	image_offset = (uintptr_t) image - ARM_TRUSTED_SRAM_BASE;
+	ret = sds_struct_write(SDS_SCP_IMG_STRUCT_ID, SDS_SCP_IMG_ADDR_OFFSET,
+			&image_offset, SDS_SCP_IMG_ADDR_SIZE,
+			SDS_ACCESS_MODE_NON_CACHED);
+	if (ret != SDS_OK)
+		goto sds_fail;
+
+	ret = sds_struct_write(SDS_SCP_IMG_STRUCT_ID, SDS_SCP_IMG_SIZE_OFFSET,
+			&image_size, SDS_SCP_IMG_SIZE_SIZE,
+			SDS_ACCESS_MODE_NON_CACHED);
+	if (ret != SDS_OK)
+		goto sds_fail;
+
+	VERBOSE("Marking SCP image metadata as valid\n");
+	image_flags = SDS_SCP_IMG_VALID_FLAG_BIT;
+	ret = sds_struct_write(SDS_SCP_IMG_STRUCT_ID, SDS_SCP_IMG_FLAG_OFFSET,
+			&image_flags, SDS_SCP_IMG_FLAG_SIZE,
+			SDS_ACCESS_MODE_NON_CACHED);
+	if (ret != SDS_OK)
+		goto sds_fail;
+
+	return 0;
+sds_fail:
+	ERROR("SCP SDS write to SCP IMG struct failed\n");
+	panic();
+}
+
+/*
+ * API to wait for SCP to signal till it's ready after booting the transferred
+ * image.
+ */
+int css_scp_boot_ready(void)
+{
+	uint32_t scp_feature_availability_flags;
+	int ret, retry = CSS_SCP_READY_10US_RETRIES;
+
+
+	VERBOSE("Waiting for SCP RAM to complete its initialization process\n");
+
+	/* Wait for the SCP RAM Firmware to complete its initialization process */
+	while (retry > 0) {
+		ret = sds_struct_read(SDS_FEATURE_AVAIL_STRUCT_ID, 0,
+				&scp_feature_availability_flags,
+				SDS_FEATURE_AVAIL_SIZE,
+				SDS_ACCESS_MODE_NON_CACHED);
+		if (ret == SDS_ERR_STRUCT_NOT_FINALIZED)
+			continue;
+
+		if (ret != SDS_OK) {
+			ERROR(" sds_struct_read failed\n");
+			panic();
+		}
+
+		if (scp_feature_availability_flags &
+				SDS_FEATURE_AVAIL_SCP_RAM_READY_BIT)
+			return 0;
+
+		udelay(10);
+		retry--;
+	}
+
+	ERROR("Timeout of %d ms expired waiting for SCP RAM Ready flag\n",
+			CSS_SCP_READY_10US_RETRIES/100);
+
+	plat_panic_handler();
+}