[PATCH] arc: dts - remove default value if CONFIG_ARC_BUILTIN_DTB_NAME is blank

From: Alexey Brodkin
Date: Sat Oct 31 2015 - 19:22:04 EST

As of today default .dtb will be built (and subsequently will be built-in
kernel binary) even if CONFIG_ARC_BUILTIN_DTB_NAME is not set.

But it is possible we're going to use external .dtb and so we don't want to
have .dtb built-in kernel binary.

For example that could be the case with:
a) U-Boot which loads .dtb in DDR and passes its address to the kernel
b) OpenWRT which embeds .dtb in existing kernel binary

This change excludes .dtb building if CONFIG_ARC_BUILTIN_DTB_NAME is

Signed-off-by: Alexey Brodkin <abrodkin@xxxxxxxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxxxx>
arch/arc/Makefile | 2 ++
arch/arc/boot/dts/Makefile | 6 ++----
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 8a27a48..b0cb6de 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -94,7 +94,9 @@ head-y := arch/arc/kernel/head.o
core-y += arch/arc/

# w/o this dtb won't embed into kernel binary
core-y += arch/arc/boot/dts/

core-$(CONFIG_ARC_PLAT_SIM) += arch/arc/plat-sim/
core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
diff --git a/arch/arc/boot/dts/Makefile b/arch/arc/boot/dts/Makefile
index b0e3f19..4dcab5b 100644
--- a/arch/arc/boot/dts/Makefile
+++ b/arch/arc/boot/dts/Makefile
@@ -1,13 +1,11 @@
# Built-in dtb
-builtindtb-y := nsim_700

builtindtb-y := $(patsubst "%",%,$(CONFIG_ARC_BUILTIN_DTB_NAME))
+ obj-y += $(builtindtb-y).dtb.o
+ targets += $(builtindtb-y).dtb

-obj-y += $(builtindtb-y).dtb.o
-targets += $(builtindtb-y).dtb
.SECONDARY: $(obj)/$(builtindtb-y).dtb.S

dtbs: $(addprefix $(obj)/, $(builtindtb-y).dtb)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/