[yocto] [meta-raspberrypi][PATCH v4 4/5] linux-raspberrypi_4.4.inc: support for .dtbo files for dtb overlays

[Herve Jourdain]

Kernel 4.4.6+ on RaspberryPi support .dtbo files for overlays, instead of .dtb.
Patch the kernel, which has faulty rules to generate .dtbo the way yocto does

Signed-off-by: Herve Jourdain <herve.jourdain at neuf.fr>
---
 .../0001-fix-dtbo-rules.patch                      | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 recipes-kernel/linux/linux-raspberrypi-4.4/0001-fix-dtbo-rules.patch

diff --git a/recipes-kernel/linux/linux-raspberrypi-4.4/0001-fix-dtbo-rules.patch b/recipes-kernel/linux/linux-raspberrypi-4.4/0001-fix-dtbo-rules.patch
new file mode 100644
index 0000000..ef04a72
--- /dev/null
+++ b/recipes-kernel/linux/linux-raspberrypi-4.4/0001-fix-dtbo-rules.patch
@@ -0,0 +1,27 @@
+diff --git a/arch/arm/Makefile b/arch/arm/Makefile
+index a2e7cf7..673c1cb 100644
+--- a/arch/arm/Makefile
++++ b/arch/arm/Makefile
+@@ -333,6 +333,8 @@ $(INSTALL_TARGETS):
+ 
+ %.dtb: | scripts
+ 	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $(boot)/dts/$@
++%.dtbo: | scripts
++	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $(boot)/dts/$@
+ 
+ PHONY += dtbs dtbs_install
+ 
+diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
+index 3079c4f..6cc3766 100644
+--- a/scripts/Makefile.lib
++++ b/scripts/Makefile.lib
+@@ -293,7 +293,8 @@ $(obj)/%.dtb: $(src)/%.dts FORCE
+ 	$(call if_changed_dep,dtc)
+ 
+ quiet_cmd_dtco = DTCO    $@
+-cmd_dtco = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
++cmd_dtco = mkdir -p $(dir ${dtc-tmp}) ; \
++	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
+ 	$(objtree)/scripts/dtc/dtc -@ -H epapr -O dtb -o $@ -b 0 \
+ 		-i $(dir $<) $(DTC_FLAGS) \
+ 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
-- 
2.7.4