linux-kernel - [PATCH] cmd_dtc: Enable generation of device tree symbols

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Message-Id: <20210125105757.661240-1-uwe@kleine-koenig.org>
Date:   Mon, 25 Jan 2021 11:57:57 +0100
From:   Uwe Kleine-König <uwe@...ine-koenig.org>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, cyril@...amax.com,
        Arnd Bergmann <arnd@...db.de>,
        Maxime Ripard <mripard@...nel.org>
Subject: [PATCH] cmd_dtc: Enable generation of device tree symbols

Adding the -@ switch to dtc results in the binary devicetrees containing
a list of symbolic references and their paths. This is necessary to
apply device tree overlays e.g. on Raspberry Pi as described on
https://www.raspberrypi.org/documentation/configuration/device-tree.md.

Obviously the downside of this change is an increas of the size of the
generated dtbs, for an arm out-of-tree build (multi_v7_defconfig):

	$ du -s arch/arm/boot/dts*
	101380	arch/arm/boot/dts-pre
	114308	arch/arm/boot/dts-post

so this is in average an increase of 12.8% in size.

Signed-off-by: Uwe Kleine-König <uwe@...ine-koenig.org>
---
 scripts/Makefile.lib | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 213677a5ed33..0683a5808f7f 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -319,7 +319,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
 
 quiet_cmd_dtc = DTC     $@
 cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
-	$(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
+	$(DTC) -@ -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
 		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
 	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
-- 
2.29.2