diff --git a/plat/arm/board/rdn2/include/platform_def.h b/plat/arm/board/rdn2/include/platform_def.h
index 3474016..8e63de58 100644
--- a/plat/arm/board/rdn2/include/platform_def.h
+++ b/plat/arm/board/rdn2/include/platform_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020-2023, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -92,6 +92,8 @@
 
 #if (CSS_SGI_PLATFORM_VARIANT == 1)
 #define PLAT_ARM_GICR_BASE		UL(0x30100000)
+#elif (CSS_SGI_PLATFORM_VARIANT == 3)
+#define PLAT_ARM_GICR_BASE		UL(0x30300000)
 #else
 #define PLAT_ARM_GICR_BASE		UL(0x301C0000)
 #endif
diff --git a/plat/arm/board/rdn2/platform.mk b/plat/arm/board/rdn2/platform.mk
index 7492fe5..b30e3fc 100644
--- a/plat/arm/board/rdn2/platform.mk
+++ b/plat/arm/board/rdn2/platform.mk
@@ -1,13 +1,13 @@
-# Copyright (c) 2020-2022, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2020-2023, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-RD_N2_VARIANTS	:= 0 1 2
+RD_N2_VARIANTS	:= 0 1 2 3
 ifneq ($(CSS_SGI_PLATFORM_VARIANT),\
 	$(filter $(CSS_SGI_PLATFORM_VARIANT),$(RD_N2_VARIANTS)))
- $(error "CSS_SGI_PLATFORM_VARIANT for RD-N2 should be 0, 1 or 2, currently set \
-     to ${CSS_SGI_PLATFORM_VARIANT}.")
+ $(error "CSS_SGI_PLATFORM_VARIANT for RD-N2 should be 0, 1, 2 or 3, currently \
+	set to ${CSS_SGI_PLATFORM_VARIANT}.")
 endif
 
 $(eval $(call CREATE_SEQ,SEQ,4))
diff --git a/plat/arm/css/sgi/include/sgi_variant.h b/plat/arm/css/sgi/include/sgi_variant.h
index 223ac3e..8f9529a 100644
--- a/plat/arm/css/sgi/include/sgi_variant.h
+++ b/plat/arm/css/sgi/include/sgi_variant.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2023, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -22,6 +22,7 @@
 
 /* SID Version values for RD-N2 variants */
 #define RD_N2_CFG1_SID_VER_PART_NUM		0x07B6
+#define RD_N2_CFG3_SID_VER_PART_NUM		0x07F1
 
 /* SID Version values for RD-V2 */
 #define RD_V2_SID_VER_PART_NUM			0x07F2
diff --git a/plat/arm/css/sgi/sgi_bl31_setup.c b/plat/arm/css/sgi/sgi_bl31_setup.c
index 9adcb7c..df2ce38 100644
--- a/plat/arm/css/sgi/sgi_bl31_setup.c
+++ b/plat/arm/css/sgi/sgi_bl31_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2022, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2023, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -80,7 +80,8 @@
 		sgi_plat_info.platform_id == RD_V1_SID_VER_PART_NUM ||
 		sgi_plat_info.platform_id == RD_N2_SID_VER_PART_NUM ||
 		sgi_plat_info.platform_id == RD_V2_SID_VER_PART_NUM ||
-		sgi_plat_info.platform_id == RD_N2_CFG1_SID_VER_PART_NUM) {
+		sgi_plat_info.platform_id == RD_N2_CFG1_SID_VER_PART_NUM ||
+		sgi_plat_info.platform_id == RD_N2_CFG3_SID_VER_PART_NUM) {
 		if (channel_id >= ARRAY_SIZE(plat_rd_scmi_info))
 			panic();
 		return &plat_rd_scmi_info[channel_id];