path: root/arch/arm/boot/Makefile
diff options
authorStephen Warren <>2012-01-09 11:38:15 -0700
committerMichal Marek <>2012-01-15 00:04:35 +0100
commit7c43185138cf523b0810ffd2c9e18e2ecb356730 (patch)
tree24deed8741857d00f5575bf8febf0c6f66357af4 /arch/arm/boot/Makefile
parent136ec2049fea65aed0446d04ab7cfff2ae3070f1 (diff)
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 <> Acked-by: Shawn Guo <> [mmarek: Dropped arch/c6x part to avoid merging commits from the middle of the merge window] Signed-off-by: Michal Marek <>
Diffstat (limited to 'arch/arm/boot/Makefile')
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile
index a1edfd5a129a..816e91bce2f9 100644
--- a/arch/arm/boot/Makefile
+++ b/arch/arm/boot/Makefile
@@ -59,9 +59,11 @@ $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
+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))