From: Frank Rowand <frowand.list@gmail.com>
To: "Uwe Kleine-König" <uwe@kleine-koenig.org>,
"Masahiro Yamada" <masahiroy@kernel.org>,
"Michal Marek" <michal.lkml@markovi.net>,
"Frank Rowand" <frowand.list@gmail.com>
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: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols
Date: Tue, 26 Jan 2021 12:01:16 -0600 [thread overview]
Message-ID: <a5c324a7-b1e9-0f80-a66a-a1afa960ea09@gmail.com> (raw)
In-Reply-To: <20210125105757.661240-1-uwe@kleine-koenig.org>
+frank
On 1/25/21 4:57 AM, Uwe Kleine-König 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>
> ---
> 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)
>
prev parent reply other threads:[~2021-01-27 7:09 UTC|newest]
Thread overview: 12+ 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 11:15 ` 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 [this message]
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