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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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WARNING: multiple messages have this Message-ID (diff)
From: Cyril Brulebois <cyril@debamax.com>
To: "Uwe Kleine-König" <uwe@kleine-koenig.org>
Cc: Michal Marek <michal.lkml@markovi.net>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-kbuild@vger.kernel.org,
	Masahiro Yamada <masahiroy@kernel.org>,
	linux-kernel@vger.kernel.org, Maxime Ripard <mripard@kernel.org>,
	linux-arm-kernel@lists.infradead.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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  reply	other threads:[~2021-01-25 13:14 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 [this message]
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

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