path: root/dts/Makefile
diff options
authorMasahiro Yamada <>2014-02-04 17:24:24 +0900
committerTom Rini <>2014-02-19 11:07:50 -0500
commit9e4140329ee9a787d0f96ac2829d618d47f7973f (patch)
tree6a40432f6f6723ba9ac5309076af17aec3bc0a9b /dts/Makefile
parentd958002589cb724907e8d4360d546403d1e6b7d8 (diff)
kbuild: change out-of-tree build
This commit changes the working directory where the build process occurs. Before this commit, build process occurred under the source tree for both in-tree and out-of-tree build. That's why we needed to add $(obj) prefix to all generated files in makefiles like follows: $(obj)u-boot.bin: $(obj)u-boot Here, $(obj) is empty for in-tree build, whereas it points to the output directory for out-of-tree build. And our old build system changes the current working directory with "make -C <sub-dir>" syntax when descending into the sub-directories. On the other hand, Kbuild uses a different idea to handle out-of-tree build and directory descending. The build process of Kbuild always occurs under the output tree. When "O=dir/to/store/output/files" is given, the build system changes the current working directory to that directory and restarts the make. Kbuild uses "make -f $(srctree)/scripts/ obj=<sub-dir>" syntax for descending into sub-directories. (We can write it like "make $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <> Tested-by: Gerhard Sittig <>
Diffstat (limited to 'dts/Makefile')
1 files changed, 3 insertions, 3 deletions
diff --git a/dts/Makefile b/dts/Makefile
index 6c7198f65f..d81f32d914 100644
--- a/dts/Makefile
+++ b/dts/Makefile
@@ -26,7 +26,7 @@ DTC_FLAGS := -R 4 -p 0x1000 \
# Use a constant name for this so we can access it from C code.
# objcopy doesn't seem to allow us to set the symbol name independently of
# the filename.
-DT_BIN := $(obj)dt.dtb
+DT_BIN := $(obj)/dt.dtb
$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
$(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp
@@ -38,7 +38,7 @@ process_lds = \
# Run the compiler and get the link script from the linker
GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
-$(obj)dt.o: $(DT_BIN)
+$(obj)/dt.o: $(DT_BIN)
# We want the output format and arch.
# We also hope to win a prize for ugliest Makefile / shell interaction
# We look in the LDSCRIPT first.
@@ -62,7 +62,7 @@ $(obj)dt.o: $(DT_BIN)
cd $(dir ${DT_BIN}) && \
$(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
- $(notdir ${DT_BIN}) $@
+ $(notdir ${DT_BIN}) $(notdir $@)
rm $(DT_BIN)
obj-$(CONFIG_OF_EMBED) := dt.o
OpenPOWER on IntegriCloud