From: Cyril Brulebois <cyril@debamax.com>
To: "Uwe Kleine-König" <uwe@kleine-koenig.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Arnd Bergmann <arnd@arndb.de>, Maxime Ripard <mripard@kernel.org>
Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols
Date: Mon, 25 Jan 2021 12:15:20 +0100 [thread overview]
Message-ID: <20210125111520.mgqe7u7fh5425ywl@debamax.com> (raw)
In-Reply-To: <20210125105757.661240-1-uwe@kleine-koenig.org>
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Hi,
Uwe Kleine-König <uwe@kleine-koenig.org> (2021-01-25):
> 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
(as spotted by Uwe right after sending →) increase
> 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>
Tested-by: Cyril Brulebois <cyril@debamax.com>
with:
- a Raspberry Pi CM3
- a carrier board designed after the official IO Board V3
- an RTC accessible over I²C, made functional via a DTB overlay, that
can only be enabled once bcm2710-rpi-cm3.dtb has been generated with
this patch applied.
Cheers,
--
Cyril Brulebois -- Debian Consultant @ DEBAMAX -- https://debamax.com/
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next prev parent reply other threads:[~2021-01-25 13:14 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 [this message]
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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