FVP: make usage of Trusted DRAM optional at build time
This patch groups the current contents of the Trusted DRAM region at
address 0x00_0600_0000 (entrypoint mailboxes and BL3-1 parameters) in
a single shared memory area that may be allocated to Trusted SRAM
(default) or Trusted DRAM at build time by setting the
FVP_SHARED_DATA_LOCATION make variable. The size of this shared
memory is 4096 bytes.
The combination 'Shared data in Trusted SRAM + TSP in Trusted DRAM'
is not currently supported due to restrictions in the maximum number
of mmu tables that can be created.
Documentation has been updated to reflect these changes.
Fixes ARM-software/tf-issues#100
Change-Id: I26ff04d33ce4cacf8d770d1a1e24132b4fc53ff0
diff --git a/plat/fvp/platform.mk b/plat/fvp/platform.mk
index 945a300..8a33a60 100644
--- a/plat/fvp/platform.mk
+++ b/plat/fvp/platform.mk
@@ -28,6 +28,17 @@
# POSSIBILITY OF SUCH DAMAGE.
#
+# Shared memory may be allocated at the top of Trusted SRAM (tsram) or at the
+# base of Trusted SRAM (tdram)
+FVP_SHARED_DATA_LOCATION := tsram
+ifeq (${FVP_SHARED_DATA_LOCATION}, tsram)
+ FVP_SHARED_DATA_LOCATION_ID := FVP_IN_TRUSTED_SRAM
+else ifeq (${FVP_SHARED_DATA_LOCATION}, tdram)
+ FVP_SHARED_DATA_LOCATION_ID := FVP_IN_TRUSTED_DRAM
+else
+ $(error "Unsupported FVP_SHARED_DATA_LOCATION value")
+endif
+
# On FVP, the TSP can execute either from Trusted SRAM or Trusted DRAM.
# Trusted SRAM is the default.
FVP_TSP_RAM_LOCATION := tsram
@@ -39,7 +50,14 @@
$(error "Unsupported FVP_TSP_RAM_LOCATION value")
endif
+ifeq (${FVP_SHARED_DATA_LOCATION}, tsram)
+ ifeq (${FVP_TSP_RAM_LOCATION}, tdram)
+ $(error Shared data in Trusted SRAM and TSP in Trusted DRAM is not supported)
+ endif
+endif
+
# Process flags
+$(eval $(call add_define,FVP_SHARED_DATA_LOCATION_ID))
$(eval $(call add_define,FVP_TSP_RAM_LOCATION_ID))
PLAT_INCLUDES := -Iplat/fvp/include/