Changes to support execution in AArch32 state for JUNO
Following steps are required to boot JUNO in AArch32 state:
1> BL1, in AArch64 state, loads BL2.
2> BL2, in AArch64 state, initializes DDR.
Loads SP_MIN & BL33 (AArch32 executable)images.
Calls RUN_IMAGE SMC to go back to BL1.
3> BL1 writes AArch32 executable opcodes, to load and branch
at the entrypoint address of SP_MIN, at HI-VECTOR address and
then request for warm reset in AArch32 state using RMR_EL3.
This patch makes following changes to facilitate above steps:
* Added assembly function to carry out step 3 above.
* Added region in TZC that enables Secure access to the
HI-VECTOR(0xFFFF0000) address space.
* AArch32 image descriptor is used, in BL2, to load
SP_MIN and BL33 AArch32 executable images.
A new flag `JUNO_AARCH32_EL3_RUNTIME` is introduced that
controls above changes. By default this flag is disabled.
NOTE: BL1 and BL2 are not supported in AArch32 state for JUNO.
Change-Id: I091d56a0e6d36663e6d9d2bb53c92c672195d1ec
Signed-off-by: Yatharth Kochar <yatharth.kochar@arm.com>
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 891e2fb..f7ec57e 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -137,8 +137,14 @@
plat/arm/common/arm_bl2_setup.c \
plat/arm/common/arm_io_storage.c
ifeq (${LOAD_IMAGE_V2},1)
-BL2_SOURCES += plat/arm/common/${ARCH}/arm_bl2_mem_params_desc.c\
- plat/arm/common/arm_image_load.c \
+# Because BL1/BL2 execute in AArch64 mode but BL32 in AArch32 we need to use
+# the AArch32 descriptors.
+ifeq (${JUNO_AARCH32_EL3_RUNTIME},1)
+BL2_SOURCES += plat/arm/common/aarch32/arm_bl2_mem_params_desc.c
+else
+BL2_SOURCES += plat/arm/common/${ARCH}/arm_bl2_mem_params_desc.c
+endif
+BL2_SOURCES += plat/arm/common/arm_image_load.c \
common/desc_image_load.c
endif