diff --git a/plat/arm/board/juno/include/platform_def.h b/plat/arm/board/juno/include/platform_def.h
index 924eb0a..0cffbe8 100644
--- a/plat/arm/board/juno/include/platform_def.h
+++ b/plat/arm/board/juno/include/platform_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -100,6 +100,20 @@
 #define PLAT_ARM_GICV_BASE		0x2c06f000
 
 /*
+ * Base address of the first memory region used for communication between AP
+ * and SCP. Used by the BOM and SCPI protocols.
+ *
+ * Note that this is located at the same address as SCP_BOOT_CFG_ADDR, which
+ * means the SCP/AP configuration data gets overwritten when the AP initiates
+ * communication with the SCP. The configuration data is expected to be a
+ * 32-bit word on all CSS platforms. On Juno, part of this configuration is
+ * which CPU is the primary, according to the shift and mask definitions below.
+ */
+#define PLAT_CSS_SCP_COM_SHARED_MEM_BASE	(ARM_TRUSTED_SRAM_BASE + 0x80)
+#define PLAT_CSS_PRIMARY_CPU_SHIFT		8
+#define PLAT_CSS_PRIMARY_CPU_BIT_WIDTH		4
+
+/*
  * Define a list of Group 1 Secure and Group 0 interrupts as per GICv3
  * terminology. On a GICv2 system or mode, the lists will be merged and treated
  * as Group 0 interrupts.
diff --git a/plat/arm/css/common/aarch64/css_helpers.S b/plat/arm/css/common/aarch64/css_helpers.S
index 2747618..0763a3e 100644
--- a/plat/arm/css/common/aarch64/css_helpers.S
+++ b/plat/arm/css/common/aarch64/css_helpers.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -117,7 +117,8 @@
 	bl	plat_my_core_pos
 	ldr	x1, =SCP_BOOT_CFG_ADDR
 	ldr	x1, [x1]
-	ubfx	x1, x1, #PRIMARY_CPU_SHIFT, #PRIMARY_CPU_BIT_WIDTH
+	ubfx	x1, x1, #PLAT_CSS_PRIMARY_CPU_SHIFT, \
+			#PLAT_CSS_PRIMARY_CPU_BIT_WIDTH
 	cmp	x0, x1
 	cset	w0, eq
 	ret	x9
diff --git a/plat/arm/css/common/css_scp_bootloader.c b/plat/arm/css/common/css_scp_bootloader.c
index c01f42f..8bfaa87 100644
--- a/plat/arm/css/common/css_scp_bootloader.c
+++ b/plat/arm/css/common/css_scp_bootloader.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -60,7 +60,7 @@
  * Unlike the SCPI protocol, the boot protocol uses the same memory region
  * for both AP -> SCP and SCP -> AP transfers; define the address of this...
  */
-#define BOM_SHARED_MEM		SCP_COM_SHARED_MEM_BASE
+#define BOM_SHARED_MEM		PLAT_CSS_SCP_COM_SHARED_MEM_BASE
 #define BOM_CMD_HEADER		((bom_cmd_t *) BOM_SHARED_MEM)
 #define BOM_CMD_PAYLOAD		((void *) (BOM_SHARED_MEM + sizeof(bom_cmd_t)))
 
diff --git a/plat/arm/css/common/css_scpi.c b/plat/arm/css/common/css_scpi.c
index 0a4eafe..9e1f973 100644
--- a/plat/arm/css/common/css_scpi.c
+++ b/plat/arm/css/common/css_scpi.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -37,8 +37,9 @@
 #include "css_mhu.h"
 #include "css_scpi.h"
 
-#define SCPI_SHARED_MEM_SCP_TO_AP	SCP_COM_SHARED_MEM_BASE
-#define SCPI_SHARED_MEM_AP_TO_SCP	(SCP_COM_SHARED_MEM_BASE + 0x100)
+#define SCPI_SHARED_MEM_SCP_TO_AP	PLAT_CSS_SCP_COM_SHARED_MEM_BASE
+#define SCPI_SHARED_MEM_AP_TO_SCP	(PLAT_CSS_SCP_COM_SHARED_MEM_BASE \
+								 + 0x100)
 
 #define SCPI_CMD_HEADER_AP_TO_SCP		\
 	((scpi_cmd_t *) SCPI_SHARED_MEM_AP_TO_SCP)