diff --git a/include/lib/aarch64/arch_helpers.h b/include/lib/aarch64/arch_helpers.h
index 067b830..d1ad31d 100644
--- a/include/lib/aarch64/arch_helpers.h
+++ b/include/lib/aarch64/arch_helpers.h
@@ -194,6 +194,8 @@
 DEFINE_SYSOP_FUNC(sev)
 DEFINE_SYSOP_TYPE_FUNC(dsb, sy)
 DEFINE_SYSOP_TYPE_FUNC(dmb, sy)
+DEFINE_SYSOP_TYPE_FUNC(dmb, st)
+DEFINE_SYSOP_TYPE_FUNC(dmb, ld)
 DEFINE_SYSOP_TYPE_FUNC(dsb, ish)
 DEFINE_SYSOP_TYPE_FUNC(dmb, ish)
 DEFINE_SYSOP_FUNC(isb)
diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index b2db616..6049171 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -151,14 +151,10 @@
 #define ARM_G0_IRQS			ARM_IRQ_SEC_SGI_0,		\
 					ARM_IRQ_SEC_SGI_6
 
-#define ARM_SHARED_RAM_ATTR		((PLAT_ARM_SHARED_RAM_CACHED ?	\
-						MT_MEMORY : MT_DEVICE)	\
-						| MT_RW | MT_SECURE)
-
 #define ARM_MAP_SHARED_RAM		MAP_REGION_FLAT(		\
 						ARM_SHARED_RAM_BASE,	\
 						ARM_SHARED_RAM_SIZE,	\
-						ARM_SHARED_RAM_ATTR)
+						MT_DEVICE | MT_RW | MT_SECURE)
 
 #define ARM_MAP_NS_DRAM1		MAP_REGION_FLAT(		\
 						ARM_NS_DRAM1_BASE,	\
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index c900278..7a5d193 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -37,8 +37,6 @@
 /*************************************************************************
  * Definitions common to all ARM Compute SubSystems (CSS)
  *************************************************************************/
-#define MHU_PAYLOAD_CACHED		0
-
 #define NSROM_BASE			0x1f000000
 #define NSROM_SIZE			0x00001000
 
@@ -118,8 +116,6 @@
 
 #define SCP_BL2U_BASE			BL31_BASE
 
-#define PLAT_ARM_SHARED_RAM_CACHED	MHU_PAYLOAD_CACHED
-
 /* Load address of Non-Secure Image for CSS platform ports */
 #define PLAT_ARM_NS_IMAGE_OFFSET	0xE0000000