Make SCP_BL2(U) image loading configurable on CSS platforms
Current code mandates loading of SCP_BL2/SCP_BL2U images for all
CSS platforms. On future ARM CSS platforms, the Application
Processor (AP) might not need to load these images. So, these
items can be removed from the FIP on those platforms.
BL2 tries to load SCP_BL2/SCP_BL2U images if their base
addresses are defined causing boot error if the images are not
found in FIP.
This change adds a make flag `CSS_LOAD_SCP_IMAGES` which if set
to `1` does:
1. Adds SCP_BL2, SCP_BL2U images to FIP.
2. Defines the base addresses of these images so that AP loads
them.
And vice-versa if it is set to `0`. The default value is set to
`1`.
Change-Id: I5abfe22d5dc1e9d80d7809acefc87b42a462204a
diff --git a/plat/arm/css/common/css_common.mk b/plat/arm/css/common/css_common.mk
index 6a8773d..65e125e 100644
--- a/plat/arm/css/common/css_common.mk
+++ b/plat/arm/css/common/css_common.mk
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2015-2016, 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:
@@ -28,6 +28,10 @@
# POSSIBILITY OF SUCH DAMAGE.
#
+
+# By default, SCP images are needed by CSS platforms.
+CSS_LOAD_SCP_IMAGES ?= 1
+
PLAT_INCLUDES += -Iinclude/plat/arm/css/common \
-Iinclude/plat/arm/css/common/aarch64
@@ -38,12 +42,10 @@
BL2_SOURCES += plat/arm/css/common/css_bl2_setup.c \
plat/arm/css/common/css_mhu.c \
- plat/arm/css/common/css_scp_bootloader.c \
plat/arm/css/common/css_scpi.c
BL2U_SOURCES += plat/arm/css/common/css_bl2u_setup.c \
plat/arm/css/common/css_mhu.c \
- plat/arm/css/common/css_scp_bootloader.c \
plat/arm/css/common/css_scpi.c
BL31_SOURCES += plat/arm/css/common/css_mhu.c \
@@ -51,17 +53,25 @@
plat/arm/css/common/css_scpi.c \
plat/arm/css/common/css_topology.c
-ifneq (${TRUSTED_BOARD_BOOT},0)
-$(eval $(call FWU_FIP_ADD_IMG,SCP_BL2U,--scp-fwu-cfg))
-endif
ifneq (${RESET_TO_BL31},0)
$(error "Using BL31 as the reset vector is not supported on CSS platforms. \
Please set RESET_TO_BL31 to 0.")
endif
-# Subsystems require a SCP_BL2 image
-$(eval $(call FIP_ADD_IMG,SCP_BL2,--scp-fw))
+# Process CSS_LOAD_SCP_IMAGES flag
+$(eval $(call assert_boolean,CSS_LOAD_SCP_IMAGES))
+$(eval $(call add_define,CSS_LOAD_SCP_IMAGES))
+
+ifeq (${CSS_LOAD_SCP_IMAGES},1)
+ $(eval $(call FIP_ADD_IMG,SCP_BL2,--scp-fw))
+ ifneq (${TRUSTED_BOARD_BOOT},0)
+ $(eval $(call FWU_FIP_ADD_IMG,SCP_BL2U,--scp-fwu-cfg))
+ endif
+
+ BL2U_SOURCES += plat/arm/css/common/css_scp_bootloader.c
+ BL2_SOURCES += plat/arm/css/common/css_scp_bootloader.c
+endif
# Enable option to detect whether the SCP ROM firmware in use predates version
# 1.7.0 and therefore, is incompatible.