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Kbuild: Use dtc's -d (dependency) option 

This hooks dtc into Kbuild's dependency system.

Thus, for example, "make dtbs" will rebuild tegra-harmony.dtb if only
tegra20.dtsi has changed yet tegra-harmony.dts has not. The previous
lack of this feature recently caused me to have very confusing "git
bisect" results.

For ARM, it's obvious what to add to $(targets). I'm not familiar enough
with other architectures to know what to add there. Powerpc appears to
already add various .dtb files into $(targets), but the other archs may
need something added to $(targets) to work.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
[mmarek: Dropped arch/c6x part to avoid merging commits from the middle
of the merge window]
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Stephen Warren 2012-01-09 11:38:15 -07:00 committed by Michal Marek
parent 136ec2049f
commit 7c43185138
5 changed files with 10 additions and 8 deletions
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6
arch/arm/boot/Makefile
View File

@ -59,9 +59,11 @@ $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
endif
targets += $(dtb-y)
# Rule to build device tree blobs
$(obj)/%.dtb: $(src)/dts/%.dts
$(call cmd,dtc)
$(obj)/%.dtb: $(src)/dts/%.dts FORCE
$(call if_changed_dep,dtc)
$(obj)/dtbs: $(addprefix $(obj)/, $(dtb-y))

2
arch/microblaze/boot/Makefile
View File

@ -53,6 +53,6 @@ $(obj)/simpleImage.%: vmlinux FORCE
DTC_FLAGS := -p 1024
$(obj)/%.dtb: $(src)/dts/%.dts FORCE
$(call cmd,dtc)
$(call if_changed_dep,dtc)
clean-files += *.dtb simpleImage.*.unstrip linux.bin.ub

4
arch/openrisc/boot/Makefile
View File

@ -11,5 +11,5 @@ clean-files := *.dtb.S
#DTC_FLAGS ?= -p 1024
$(obj)/%.dtb: $(src)/dts/%.dts
$(call cmd,dtc)
$(obj)/%.dtb: $(src)/dts/%.dts FORCE
$(call if_changed_dep,dtc)

4
arch/powerpc/boot/Makefile
View File

@ -334,8 +334,8 @@ $(obj)/treeImage.%: vmlinux $(obj)/%.dtb $(wrapperbits)
$(call if_changed,wrap,treeboot-$*,,$(obj)/$*.dtb)
# Rule to build device tree blobs
$(obj)/%.dtb: $(src)/dts/%.dts
$(call cmd,dtc)
$(obj)/%.dtb: $(src)/dts/%.dts FORCE
$(call if_changed_dep,dtc)
# If there isn't a platform selected then just strip the vmlinux.
ifeq (,$(image-y))

2
scripts/Makefile.lib
View File

@ -264,7 +264,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb
$(call cmd,dt_S_dtb)
quiet_cmd_dtc = DTC $@
cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $<
cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $<
# Bzip2
# ---------------------------------------------------------------------------