From: Masahiro Yamada <masahiroy@kernel.org> To: "Uwe Kleine-König" <uwe@kleine-koenig.org> Cc: Michal Marek <michal.lkml@markovi.net>, Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, cyril@debamax.com, Arnd Bergmann <arnd@arndb.de>, Maxime Ripard <mripard@kernel.org>, DTML <devicetree@vger.kernel.org> Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols Date: Tue, 26 Jan 2021 06:53:22 +0900 [thread overview] Message-ID: <CAK7LNAS5t1wew0MMFjdB5HGCAMerhU7pAGiFhcTtCRUAAjGLpw@mail.gmail.com> (raw) In-Reply-To: <20210125105757.661240-1-uwe@kleine-koenig.org> On Mon, Jan 25, 2021 at 8:07 PM Uwe Kleine-König <uwe@kleine-koenig.org> wrote: > > 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> (CCing DT ML.) https://www.spinics.net/lists/linux-kbuild/msg27904.html See Rob's comment: "We've already rejected doing that. Turning on '-@' can grow the dtb size by a significant amount which could be problematic for some boards." > --- > 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 > -- Best Regards Masahiro Yamada
WARNING: multiple messages have this Message-ID (diff)
From: Masahiro Yamada <masahiroy@kernel.org> To: "Uwe Kleine-König" <uwe@kleine-koenig.org> Cc: DTML <devicetree@vger.kernel.org>, Michal Marek <michal.lkml@markovi.net>, Arnd Bergmann <arnd@arndb.de>, Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Maxime Ripard <mripard@kernel.org>, cyril@debamax.com, linux-arm-kernel <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols Date: Tue, 26 Jan 2021 06:53:22 +0900 [thread overview] Message-ID: <CAK7LNAS5t1wew0MMFjdB5HGCAMerhU7pAGiFhcTtCRUAAjGLpw@mail.gmail.com> (raw) In-Reply-To: <20210125105757.661240-1-uwe@kleine-koenig.org> On Mon, Jan 25, 2021 at 8:07 PM Uwe Kleine-König <uwe@kleine-koenig.org> wrote: > > 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> (CCing DT ML.) https://www.spinics.net/lists/linux-kbuild/msg27904.html See Rob's comment: "We've already rejected doing that. Turning on '-@' can grow the dtb size by a significant amount which could be problematic for some boards." > --- > 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 > -- Best Regards Masahiro Yamada _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-01-25 21:55 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-25 10:57 [PATCH] cmd_dtc: Enable generation of device tree symbols Uwe Kleine-König 2021-01-25 10:57 ` 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 [this message] 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
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