scripts: dtc: Build fdtoverlay tool
We will start building overlays for platforms soon in the kernel and
would need fdtoverlay going forward. Lets start building it.
The fdtoverlay program applies one or more overlay dtb blobs to a base
dtb blob. The kernel build system would later use fdtoverlay to generate
the overlaid blobs based on platform specific configurations.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/4a201dea3ba11a00cab7e936dfc1140dac1a1ae3.1611904394.git.viresh.kumar@linaro.org
diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index 4852bf4..c8c21e0 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -1,13 +1,19 @@
# SPDX-License-Identifier: GPL-2.0
# scripts/dtc makefile
-hostprogs-always-$(CONFIG_DTC) += dtc
+hostprogs-always-$(CONFIG_DTC) += dtc fdtoverlay
hostprogs-always-$(CHECK_DT_BINDING) += dtc
dtc-objs := dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
srcpos.o checks.o util.o
dtc-objs += dtc-lexer.lex.o dtc-parser.tab.o
+# The upstream project builds libfdt as a separate library. We are choosing to
+# instead directly link the libfdt object files into fdtoverlay.
+libfdt-objs := fdt.o fdt_ro.o fdt_wip.o fdt_sw.o fdt_rw.o fdt_strerror.o fdt_empty_tree.o fdt_addresses.o fdt_overlay.o
+libfdt = $(addprefix libfdt/,$(libfdt-objs))
+fdtoverlay-objs := $(libfdt) fdtoverlay.o util.o
+
# Source files need to get at the userspace version of libfdt_env.h to compile
HOST_EXTRACFLAGS += -I $(srctree)/$(src)/libfdt
