All of lore.kernel.org
 help / color / mirror / Atom feed
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


WARNING: multiple messages have this Message-ID (diff)
From: "Uwe Kleine-König" <uwe@kleine-koenig.org>
To: Masahiro Yamada <masahiroy@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>
Cc: Arnd Bergmann <arnd@arndb.de>,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	Maxime Ripard <mripard@kernel.org>,
	cyril@debamax.com, linux-arm-kernel@lists.infradead.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


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25 10:57 Uwe Kleine-König [this message]
2021-01-25 10:57 ` [PATCH] cmd_dtc: Enable generation of device tree symbols Uwe Kleine-König
2021-01-25 11:15 ` Cyril Brulebois
2021-01-25 11:15   ` Cyril Brulebois
2021-01-26 18:01   ` Frank Rowand
2021-01-26 18:01     ` Frank Rowand
2021-01-25 21:53 ` Masahiro Yamada
2021-01-25 21:53   ` Masahiro Yamada
2021-01-26  7:20   ` Uwe Kleine-König
2021-01-26  7:20     ` Uwe Kleine-König
2021-01-26  8:43     ` Geert Uytterhoeven
2021-01-26  8:43       ` Geert Uytterhoeven
2021-01-26 18:03       ` Frank Rowand
2021-01-26 18:03         ` Frank Rowand
2021-01-26 13:42     ` Rob Herring
2021-01-26 13:42       ` Rob Herring
2021-01-26 18:03     ` Frank Rowand
2021-01-26 18:03       ` Frank Rowand
2021-01-26 18:26       ` Frank Rowand
2021-01-26 18:26         ` Frank Rowand
2021-01-26 18:02   ` Frank Rowand
2021-01-26 18:02     ` Frank Rowand
2021-01-26 18:01 ` Frank Rowand
2021-01-26 18:01   ` Frank Rowand

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210125105757.661240-1-uwe@kleine-koenig.org \
    --to=uwe@kleine-koenig.org \
    --cc=arnd@arndb.de \
    --cc=cyril@debamax.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=masahiroy@kernel.org \
    --cc=michal.lkml@markovi.net \
    --cc=mripard@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.