linux-kernel - Re: [PATCH] cmd_dtc: Enable generation of device tree symbols

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Date:   Mon, 25 Jan 2021 12:15:20 +0100
From:   Cyril Brulebois <cyril@...amax.com>
To:     Uwe Kleine-König <uwe@...ine-koenig.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Arnd Bergmann <arnd@...db.de>,
        Maxime Ripard <mripard@...nel.org>
Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols

Hi,

Uwe Kleine-König <uwe@...ine-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@...ine-koenig.org>

Tested-by: Cyril Brulebois <cyril@...amax.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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