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From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Masahiro Yamada <masahiroy@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>
Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, cyril@debamax.com,
	Arnd Bergmann <arnd@arndb.de>, Maxime Ripard <mripard@kernel.org>
Subject: [PATCH] cmd_dtc: Enable generation of device tree symbols
Date: Mon, 25 Jan 2021 11:57:57 +0100	[thread overview]
Message-ID: <20210125105757.661240-1-uwe@kleine-koenig.org> (raw)

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@kleine-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


             reply	other threads:[~2021-01-26 19:37 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 10:57 Uwe Kleine-König [this message]
2021-01-25 11:15 ` [PATCH] cmd_dtc: Enable generation of device tree symbols Cyril Brulebois
2021-01-26 18:01   ` Frank Rowand
2021-01-25 21:53 ` Masahiro Yamada
2021-01-26  7:20   ` Uwe Kleine-König
2021-01-26  8:43     ` Geert Uytterhoeven
2021-01-26 18:03       ` Frank Rowand
2021-01-26 13:42     ` Rob Herring
2021-01-26 18:03     ` Frank Rowand
2021-01-26 18:26       ` Frank Rowand
2021-01-26 18:02   ` Frank Rowand
2021-01-26 18:01 ` Frank Rowand

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