diff --git a/plat/arm/board/rdn1edge/rdn1edge_security.c b/plat/arm/board/rdn1edge/rdn1edge_security.c
new file mode 100644
index 0000000..ffa8935
--- /dev/null
+++ b/plat/arm/board/rdn1edge/rdn1edge_security.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2019, ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <platform_def.h>
+
+#include <common/debug.h>
+#include <drivers/arm/tzc_dmc620.h>
+
+uintptr_t rdn1edge_dmc_base[] = {
+	RDN1EDGE_DMC620_BASE0,
+	RDN1EDGE_DMC620_BASE1
+};
+
+static const tzc_dmc620_driver_data_t rdn1edge_plat_driver_data = {
+	.dmc_base = rdn1edge_dmc_base,
+	.dmc_count = ARRAY_SIZE(rdn1edge_dmc_base)
+};
+
+static const tzc_dmc620_acc_addr_data_t rdn1edge_acc_addr_data[] = {
+	{
+		.region_base = ARM_AP_TZC_DRAM1_BASE,
+		.region_top = ARM_AP_TZC_DRAM1_BASE + ARM_TZC_DRAM1_SIZE - 1,
+		.sec_attr = TZC_DMC620_REGION_S_RDWR
+	}
+};
+
+static const tzc_dmc620_config_data_t rdn1edge_plat_config_data = {
+	.plat_drv_data = &rdn1edge_plat_driver_data,
+	.plat_acc_addr_data = rdn1edge_acc_addr_data,
+	.acc_addr_count = ARRAY_SIZE(rdn1edge_acc_addr_data)
+};
+
+/* Initialize the secure environment */
+void plat_arm_security_setup(void)
+{
+	arm_tzc_dmc620_setup(&rdn1edge_plat_config_data);
+}