[PATCH 5/6] make: Use shell script to generate .dtb.S files

[Sascha Hauer]

Using shell in make to generate an assembly file is not very
readable and extendable. Add an external shell script instead.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 scripts/Makefile.lib | 18 +++---------------
 scripts/gen-dtb-s    | 14 ++++++++++++++
 2 files changed, 17 insertions(+), 15 deletions(-)
 create mode 100755 scripts/gen-dtb-s

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 0a6302b..ea086fe 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -210,21 +210,9 @@ cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 
 # Generate an assembly file to wrap the output of the device tree compiler
 quiet_cmd_dt_S_dtb = DTB     $@
-cmd_dt_S_dtb=							\
-(								\
-	echo '\#include <asm-generic/barebox.lds.h>';		\
-	echo '.section .dtb.rodata.$(subst -,_,$(*F)),"a"';	\
-	echo '.balign STRUCT_ALIGNMENT';			\
-	echo '.global __dtb_$(subst -,_,$(*F))_start';		\
-	echo '__dtb_$(subst -,_,$(*F))_start:';			\
-	echo '.incbin "$<" ';					\
-	echo '__dtb_$(subst -,_,$(*F))_end:';			\
-	echo '.global __dtb_$(subst -,_,$(*F))_end';		\
-	echo '.balign STRUCT_ALIGNMENT';			\
-) > $@
-
-$(obj)/%.dtb.S: $(obj)/%.dtb
-	$(call cmd,dt_S_dtb)
+cmd_dt_S_dtb= ( $(srctree)/scripts/gen-dtb-s $(subst -,_,$(*F)) $< > $@
+$(obj)/%.dtb.S: $(obj)/%.dtb $(srctree)/scripts/gen-dtb-s FORCE
+	$(call if_changed,dt_S_dtb)
 
 quiet_cmd_dtc = DTC     $@
 cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
diff --git a/scripts/gen-dtb-s b/scripts/gen-dtb-s
new file mode 100755
index 0000000..44136b0
--- /dev/null
+++ b/scripts/gen-dtb-s
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+name=$1
+dtb=$2
+
+echo "#include <asm-generic/barebox.lds.h>"
+echo ".section .dtb.rodata.${name},\"a\""
+echo ".balign STRUCT_ALIGNMENT"
+echo ".global __dtb_${name}_start"
+echo "__dtb_${name}_start:"
+echo ".incbin \"$dtb\""
+echo "__dtb_${name}_end:"
+echo ".global __dtb_${name}_end"
+echo ".balign STRUCT_ALIGNMENT"
-- 
2.0.1