Makefile: Add ability to build dtb
This is a revamp of the original approach in:
https://github.com/ARM-software/arm-trusted-firmware/pull/747
Current build system has no means to automatically generate dtbs from
dts, instead, stores the dtbs in the fdts/ folder. While this makes
perfect sense for many reference platforms, this becomes a minor
breakage in development flow for newer platforms.
However, this can be solved by providing a rule for the dtbs while
building the ATF binaries by purely describing which dts sources we
need.
For example, with this change, we will now be able to describe the
dtbs we need for the platform in the corresponding platform.mk file:
FDT_SOURCES += fdts/abc.dts
This should be able to generate the abc.dtb appropriately.
Since device trees are specification of hardware, we don't tie the rule
to any specific BL, instead a generic rule is introduced.
Further, this approach allows us to generate appropriate dtbs which may be
need to be regenerated when a common dtsi gets updated, by just
restricting changes to the dtsi alone, instead of synchronizing all the
dtbs as well.
If dtc is not available in default paths, but is available in an
alternate location, it can be chosen by overriding the DTC variable
such as 'make DTC=~/dtc/dtc ....`
NOTE: dtbs are built only with the explicit make dtbs command. The rule
is only available if the platform defines a FDT_SOURCES variable.
Signed-off-by: Benjamin Fair <b-fair@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index e59a64b..fd8eb05 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -336,3 +336,49 @@
endef
+define SOURCES_TO_DTBS
+ $(notdir $(patsubst %.dts,%.dtb,$(filter %.dts,$(1))))
+endef
+
+# MAKE_FDT macro defines the targets and options to build each FDT binary
+# Arguments: (none)
+define MAKE_FDT
+ $(eval DTB_BUILD_DIR := ${BUILD_PLAT}/fdts)
+ $(eval DTBS := $(addprefix $(DTB_BUILD_DIR)/,$(call SOURCES_TO_DTBS,$(FDT_SOURCES))))
+ $(eval TEMP_DTB_DIRS := $(sort $(dir ${DTBS})))
+ # The $(dir ) function leaves a trailing / on the directory names
+ # Rip off the / to match directory names with make rule targets.
+ $(eval DTB_DIRS := $(patsubst %/,%,$(TEMP_DTB_DIRS)))
+
+$(eval $(foreach objd,${DTB_DIRS},$(call MAKE_PREREQ_DIR,${objd},${BUILD_DIR})))
+
+fdt_dirs: ${DTB_DIRS}
+
+endef
+
+# MAKE_DTB generate the Flattened device tree binary (device tree binary)
+# $(1) = output directory
+# $(2) = input dts
+define MAKE_DTB
+
+$(eval DOBJ := $(1)/$(patsubst %.dts,%.dtb,$(notdir $(2))))
+$(eval DEP := $(patsubst %.dtb,%.d,$(DOBJ)))
+
+$(DOBJ): $(2) | fdt_dirs
+ @echo " DTC $$<"
+ $$(Q)$$(DTC) $$(DTC_FLAGS) -d $(DEP) -o $$@ $$<
+
+-include $(DEP)
+
+endef
+
+# MAKE_DTBS builds flattened device tree sources
+# $(1) = output directory
+# $(2) = list of flattened device tree source files
+define MAKE_DTBS
+ $(eval DOBJS := $(filter %.dts,$(2)))
+ $(eval REMAIN := $(filter-out %.dts,$(2)))
+ $(eval $(foreach obj,$(DOBJS),$(call MAKE_DTB,$(1),$(obj))))
+
+ $(and $(REMAIN),$(error Unexpected s present: $(REMAIN)))
+endef