diff --git a/plat/arm/css/sgi/include/sgi_soc_platform_def.h b/plat/arm/css/sgi/include/sgi_soc_platform_def.h
index d7a839a..405d62f 100644
--- a/plat/arm/css/sgi/include/sgi_soc_platform_def.h
+++ b/plat/arm/css/sgi/include/sgi_soc_platform_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,4 +12,22 @@
 #include <plat/arm/board/common/v2m_def.h>
 #include <plat/arm/soc/common/soc_css_def.h>
 
+/* Map the System registers to access from S-EL0 */
+#define CSS_SYSTEMREG_DEVICE_BASE	(0x1C010000)
+#define CSS_SYSTEMREG_DEVICE_SIZE	(0x00010000)
+#define PLAT_ARM_SECURE_MAP_SYSTEMREG	MAP_REGION_FLAT(		    \
+						CSS_SYSTEMREG_DEVICE_BASE,  \
+						CSS_SYSTEMREG_DEVICE_SIZE,  \
+						(MT_DEVICE | MT_RW |	    \
+						 MT_SECURE | MT_USER))
+
+/* Map the NOR2 Flash to access from S-EL0 */
+#define CSS_NOR2_FLASH_DEVICE_BASE	(0x10000000)
+#define CSS_NOR2_FLASH_DEVICE_SIZE	(0x04000000)
+#define PLAT_ARM_SECURE_MAP_NOR2	MAP_REGION_FLAT(                    \
+						CSS_NOR2_FLASH_DEVICE_BASE, \
+						CSS_NOR2_FLASH_DEVICE_SIZE, \
+						(MT_DEVICE | MT_RW |	    \
+						 MT_SECURE | MT_USER))
+
 #endif /* SGI_SOC_PLATFORM_DEF_H */