diff --git a/plat/arm/common/arm_bl1_setup.c b/plat/arm/common/arm_bl1_setup.c
index d141f64..34e0a29 100644
--- a/plat/arm/common/arm_bl1_setup.c
+++ b/plat/arm/common/arm_bl1_setup.c
@@ -144,7 +144,7 @@
 	 * in order to release secondary CPUs from their holding pen and make
 	 * them jump there.
 	 */
-	arm_program_trusted_mailbox(ep_info->pc);
+	plat_arm_program_trusted_mailbox(ep_info->pc);
 	dsbsy();
 	sev();
 #endif
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 5330847..67b574d 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -166,7 +166,7 @@
 				plat/arm/common/arm_err.c			\
 				plat/arm/common/arm_io_storage.c
 ifdef EL3_PAYLOAD_BASE
-# Need the arm_program_trusted_mailbox() function to release secondary CPUs from
+# Need the plat_arm_program_trusted_mailbox() function to release secondary CPUs from
 # their holding pen
 BL1_SOURCES		+=	plat/arm/common/arm_pm.c
 endif
diff --git a/plat/arm/common/arm_pm.c b/plat/arm/common/arm_pm.c
index 4632099..73d7106 100644
--- a/plat/arm/common/arm_pm.c
+++ b/plat/arm/common/arm_pm.c
@@ -14,8 +14,9 @@
 #include <platform_def.h>
 #include <psci.h>
 
-/* Allow ARM Standard platforms to override this function */
+/* Allow ARM Standard platforms to override these functions */
 #pragma weak plat_arm_psci_override_pm_ops
+#pragma weak plat_arm_program_trusted_mailbox
 
 /* Standard ARM platforms are expected to export plat_arm_psci_pm_ops */
 extern plat_psci_ops_t plat_arm_psci_pm_ops;
@@ -192,11 +193,11 @@
 }
 
 /*******************************************************************************
- * Private function to program the mailbox for a cpu before it is released
+ * ARM platform function to program the mailbox for a cpu before it is released
  * from reset. This function assumes that the Trusted mail box base is within
  * the ARM_SHARED_RAM region
  ******************************************************************************/
-void arm_program_trusted_mailbox(uintptr_t address)
+void plat_arm_program_trusted_mailbox(uintptr_t address)
 {
 	uintptr_t *mailbox = (void *) PLAT_ARM_TRUSTED_MAILBOX_BASE;
 
@@ -221,6 +222,6 @@
 	*psci_ops = plat_arm_psci_override_pm_ops(&plat_arm_psci_pm_ops);
 
 	/* Setup mailbox with entry point. */
-	arm_program_trusted_mailbox(sec_entrypoint);
+	plat_arm_program_trusted_mailbox(sec_entrypoint);
 	return 0;
 }
diff --git a/plat/arm/css/drivers/scp/css_pm_scmi.c b/plat/arm/css/drivers/scp/css_pm_scmi.c
index 715bf98..7032267 100644
--- a/plat/arm/css/drivers/scp/css_pm_scmi.c
+++ b/plat/arm/css/drivers/scp/css_pm_scmi.c
@@ -306,6 +306,28 @@
 		.ring_doorbell = &mhu_ring_doorbell,
 };
 
+static int scmi_ap_core_init(scmi_channel_t *ch)
+{
+#if PROGRAMMABLE_RESET_ADDRESS
+	uint32_t version;
+	int ret;
+
+	ret = scmi_proto_version(ch, SCMI_AP_CORE_PROTO_ID, &version);
+	if (ret != SCMI_E_SUCCESS) {
+		WARN("SCMI AP core protocol version message failed\n");
+		return -1;
+	}
+
+	if (!is_scmi_version_compatible(SCMI_AP_CORE_PROTO_VER, version)) {
+		WARN("SCMI AP core protocol version 0x%x incompatible with driver version 0x%x\n",
+			version, SCMI_AP_CORE_PROTO_VER);
+		return -1;
+	}
+	INFO("SCMI AP core protocol version 0x%x detected\n", version);
+#endif
+	return 0;
+}
+
 void plat_arm_pwrc_setup(void)
 {
 	channel.info = &plat_css_scmi_plat_info;
@@ -315,6 +337,10 @@
 		ERROR("SCMI Initialization failed\n");
 		panic();
 	}
+	if (scmi_ap_core_init(&channel) < 0) {
+		ERROR("SCMI AP core protocol initialization failed\n");
+		panic();
+	}
 }
 
 /******************************************************************************
@@ -386,3 +412,18 @@
 	 */
 	return 0;
 }
+
+#if PROGRAMMABLE_RESET_ADDRESS
+void plat_arm_program_trusted_mailbox(uintptr_t address)
+{
+	int ret;
+
+	assert(scmi_handle);
+	ret = scmi_ap_core_set_reset_addr(scmi_handle, address,
+		SCMI_AP_CORE_LOCK_ATTR);
+	if (ret != SCMI_E_SUCCESS) {
+		ERROR("CSS: Failed to program reset address: %d\n", ret);
+		panic();
+	}
+}
+#endif