diff --git a/plat/intel/soc/agilex/include/socfpga_plat_def.h b/plat/intel/soc/agilex/include/socfpga_plat_def.h
index 4e3397f..d752354 100644
--- a/plat/intel/soc/agilex/include/socfpga_plat_def.h
+++ b/plat/intel/soc/agilex/include/socfpga_plat_def.h
@@ -16,6 +16,11 @@
 /* Platform Setting */
 #define PLATFORM_MODEL				PLAT_SOCFPGA_AGILEX
 #define BOOT_SOURCE				BOOT_SOURCE_SDMMC
+/* 1 = Flush cache, 0 = No cache flush.
+ * Default for Agilex is No cache flush.
+ * For Agilex FP8, set to Flush cache.
+ */
+#define CACHE_FLUSH				0
 #define PLAT_PRIMARY_CPU			0
 #define PLAT_CLUSTER_ID_MPIDR_AFF_SHIFT		MPIDR_AFF1_SHIFT
 #define PLAT_CPU_ID_MPIDR_AFF_SHIFT		MPIDR_AFF0_SHIFT
diff --git a/plat/intel/soc/agilex5/include/socfpga_plat_def.h b/plat/intel/soc/agilex5/include/socfpga_plat_def.h
index 5789261..2b0ad01 100644
--- a/plat/intel/soc/agilex5/include/socfpga_plat_def.h
+++ b/plat/intel/soc/agilex5/include/socfpga_plat_def.h
@@ -17,6 +17,10 @@
 /* Platform Setting */
 #define PLATFORM_MODEL						PLAT_SOCFPGA_AGILEX5
 #define BOOT_SOURCE						BOOT_SOURCE_SDMMC
+/* 1 = Flush cache, 0 = No cache flush.
+ * Default for Agilex5 is Cache flush.
+ */
+#define CACHE_FLUSH							1
 #define MMC_DEVICE_TYPE						1  /* MMC = 0, SD = 1 */
 #define XLAT_TABLES_V2						U(1)
 #define PLAT_PRIMARY_CPU_A55					0x000
diff --git a/plat/intel/soc/common/aarch64/plat_helpers.S b/plat/intel/soc/common/aarch64/plat_helpers.S
index cbd0121..6ce4148 100644
--- a/plat/intel/soc/common/aarch64/plat_helpers.S
+++ b/plat/intel/soc/common/aarch64/plat_helpers.S
@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2019-2023, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019-2023, Intel Corporation. All rights reserved.
+ * Copyright (c) 2024, Altera Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -19,6 +21,7 @@
 	.globl  plat_crash_console_flush
 	.globl	platform_mem_init
 	.globl	plat_secondary_cpus_bl31_entry
+	.globl	invalidate_cache_low_el
 
 	.globl plat_get_my_entrypoint
 
@@ -213,3 +216,18 @@
 		_exception_vectors=runtime_exceptions		\
 		_pie_fixup_size=BL31_LIMIT - BL31_BASE
 endfunc plat_secondary_cpus_bl31_entry
+
+/* --------------------------------------------------------
+	 * Invalidate for NS EL2 and EL1
+	 * --------------------------------------------------------
+	 */
+func invalidate_cache_low_el
+	mrs	x0,SCR_EL3
+	orr	x1,x0,#SCR_NS_BIT
+	msr	SCR_EL3, x1
+	isb
+	tlbi	ALLE2
+	dsb	sy
+	tlbi	ALLE1
+	dsb	sy
+endfunc invalidate_cache_low_el
diff --git a/plat/intel/soc/common/drivers/ccu/ncore_ccu.c b/plat/intel/soc/common/drivers/ccu/ncore_ccu.c
index ca76b6a..931ffcf 100644
--- a/plat/intel/soc/common/drivers/ccu/ncore_ccu.c
+++ b/plat/intel/soc/common/drivers/ccu/ncore_ccu.c
@@ -1,10 +1,12 @@
 /*
  * Copyright (c) 2019-2023, Intel Corporation. All rights reserved.
+ * Copyright (c) 2024, Altera Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 #include <assert.h>
 #include <common/debug.h>
+#include <drivers/delay_timer.h>
 #include <errno.h>
 #include <lib/mmio.h>
 #include <platform_def.h>
@@ -16,7 +18,24 @@
 
 uint32_t poll_active_bit(uint32_t dir);
 
-#define SMMU_DMI			1
+#define SMMU_DMI					1
+#define CCU_DMI0_DMIUSMCMCR				SOCFPGA_CCU_NOC_REG_BASE + 0x7340
+#define CCU_DMI0_DMIUSMCMAR				SOCFPGA_CCU_NOC_REG_BASE + 0x7344
+#define CCU_DMI0_DMIUSMCMCR_MNTOP			GENMASK(3, 0)
+#define MAX_DISTRIBUTED_MEM_INTERFACE			2
+#define FLUSH_ALL_ENTRIES				0x4
+#define CCU_DMI0_DMIUSMCMCR_ARRAY_ID			GENMASK(21, 16)
+#define ARRAY_ID_TAG					0x0
+#define ARRAY_ID_DATA					0x1
+#define CACHE_OPERATION_DONE				BIT(0)
+#define TIMEOUT_200MS					200
+
+#define __bf_shf(x)					(__builtin_ffsll(x) - 1)
+
+#define FIELD_PREP(_mask, _val)						\
+	({ \
+		((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask);	\
+	})
 
 #if PLATFORM_MODEL == PLAT_SOCFPGA_AGILEX5
 ncore_ccu_reg_t ncore_ccu_modules[] = {
@@ -632,3 +651,61 @@
 	mmio_write_32(SOCFPGA_SYSMGR(TSN_TBU_STREAM_CTRL_REG_3_TSN1), ENABLE_STREAMID);
 	mmio_write_32(SOCFPGA_SYSMGR(TSN_TBU_STREAM_CTRL_REG_3_TSN2), ENABLE_STREAMID);
 }
+
+#if PLATFORM_MODEL == PLAT_SOCFPGA_AGILEX5
+/* TODO: Temp added this here*/
+static int poll_idle_status(uint32_t addr, uint32_t mask, uint32_t match, uint32_t delay_ms)
+{
+	int time_out = delay_ms;
+
+	while (time_out-- > 0) {
+
+		if ((mmio_read_32(addr) & mask) == match) {
+			return 0;
+		}
+		udelay(1000);
+	}
+
+	return -ETIMEDOUT;
+}
+
+int flush_l3_dcache(void)
+{
+	int i;
+	int ret = 0;
+
+	/* Flushing all entries in CCU system memory cache */
+	for (i = 0; i < MAX_DISTRIBUTED_MEM_INTERFACE; i++) {
+		mmio_write_32(FIELD_PREP(CCU_DMI0_DMIUSMCMCR_MNTOP, FLUSH_ALL_ENTRIES) |
+			   FIELD_PREP(CCU_DMI0_DMIUSMCMCR_ARRAY_ID, ARRAY_ID_TAG),
+			   (uintptr_t)(CCU_DMI0_DMIUSMCMCR + (i * 0x1000)));
+
+		/* Wait for cache maintenance operation done */
+		ret = poll_idle_status((CCU_DMI0_DMIUSMCMAR +
+				(i * 0x1000)), CACHE_OPERATION_DONE,
+				CACHE_OPERATION_DONE, TIMEOUT_200MS);
+
+		if (ret != 0) {
+			VERBOSE("%s: Timeout while waiting for flushing tag in DMI%d done\n",
+					__func__, i);
+			return ret;
+		}
+
+		mmio_write_32(FIELD_PREP(CCU_DMI0_DMIUSMCMCR_MNTOP, FLUSH_ALL_ENTRIES) |
+			   FIELD_PREP(CCU_DMI0_DMIUSMCMCR_ARRAY_ID, ARRAY_ID_DATA),
+			   (uintptr_t)(CCU_DMI0_DMIUSMCMCR + (i * 0x1000)));
+
+		/* Wait for cache maintenance operation done */
+		ret = poll_idle_status((CCU_DMI0_DMIUSMCMAR +
+				(i * 0x1000)), CACHE_OPERATION_DONE,
+				CACHE_OPERATION_DONE, TIMEOUT_200MS);
+
+		if (ret != 0) {
+			VERBOSE("%s: Timeout while waiting for flushing data in DMI%d done\n",
+					__func__, i);
+		}
+	}
+
+	return ret;
+}
+#endif
diff --git a/plat/intel/soc/common/drivers/ccu/ncore_ccu.h b/plat/intel/soc/common/drivers/ccu/ncore_ccu.h
index e00c4b7..a89c098 100644
--- a/plat/intel/soc/common/drivers/ccu/ncore_ccu.h
+++ b/plat/intel/soc/common/drivers/ccu/ncore_ccu.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2019-2023, Intel Corporation. All rights reserved.
+ * Copyright (c) 2024, Altera Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -452,5 +453,6 @@
 uint32_t init_ncore_ccu(void);
 void ncore_enable_ocram_firewall(void);
 void setup_smmu_stream_id(void);
+int flush_l3_dcache(void);
 
 #endif
diff --git a/plat/intel/soc/common/include/socfpga_private.h b/plat/intel/soc/common/include/socfpga_private.h
index 041c282..b54b402 100644
--- a/plat/intel/soc/common/include/socfpga_private.h
+++ b/plat/intel/soc/common/include/socfpga_private.h
@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2019-2022, Intel Corporation. All rights reserved.
+ * Copyright (c) 2019-2023, Intel Corporation. All rights reserved.
+ * Copyright (c) 2024, Altera Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -64,4 +65,6 @@
 
 void plat_secondary_cpus_bl31_entry(void);
 
+void invalidate_cache_low_el(void);
+
 #endif /* SOCFPGA_PRIVATE_H */
diff --git a/plat/intel/soc/common/socfpga_psci.c b/plat/intel/soc/common/socfpga_psci.c
index 623843e..8baa8dd 100644
--- a/plat/intel/soc/common/socfpga_psci.c
+++ b/plat/intel/soc/common/socfpga_psci.c
@@ -17,8 +17,10 @@
 #include <lib/mmio.h>
 #include <lib/psci/psci.h>
 #include <plat/common/platform.h>
+#include "ccu/ncore_ccu.h"
 #include "socfpga_mailbox.h"
 #include "socfpga_plat_def.h"
+#include "socfpga_private.h"
 #include "socfpga_reset_manager.h"
 #include "socfpga_sip_svc.h"
 #include "socfpga_system_manager.h"
@@ -190,6 +192,14 @@
 	if (intel_rsu_update_address) {
 		mailbox_rsu_update(addr_buf);
 	} else {
+#if CACHE_FLUSH
+		/* ATF Flush and Invalidate Cache */
+		dcsw_op_all(DCCISW);
+		invalidate_cache_low_el();
+#if PLATFORM_MODEL == PLAT_SOCFPGA_AGILEX5
+		flush_l3_dcache();
+#endif
+#endif
 		mailbox_reset_cold();
 	}
 
diff --git a/plat/intel/soc/stratix10/platform.mk b/plat/intel/soc/stratix10/platform.mk
index afcf514..0a33c3d 100644
--- a/plat/intel/soc/stratix10/platform.mk
+++ b/plat/intel/soc/stratix10/platform.mk
@@ -1,6 +1,7 @@
 #
 # Copyright (c) 2019-2023, ARM Limited and Contributors. All rights reserved.
-# Copyright (c) 2019-2022, Intel Corporation. All rights reserved.
+# Copyright (c) 2019-2023, Intel Corporation. All rights reserved.
+# Copyright (c) 2024, Altera Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -26,6 +27,7 @@
 			lib/xlat_tables/xlat_tables_common.c 		\
 			plat/intel/soc/common/aarch64/platform_common.c \
 			plat/intel/soc/common/aarch64/plat_helpers.S	\
+			plat/intel/soc/common/drivers/ccu/ncore_ccu.c	\
 			plat/intel/soc/common/socfpga_delay_timer.c	\
 			plat/intel/soc/common/soc/socfpga_firewall.c