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Subject: Re: [RFC PATCH 0/3] Add device tree build information
To:     Alexandre Torgue <alexandre.torgue@st.com>, robh+dt@kernel.org,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        david@gibson.dropbear.id.au, sjg@chromium.org
Cc:     devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-kbuild@vger.kernel.org, devicetree-compiler@vger.kernel.org
References: <20200113181625.3130-1-alexandre.torgue@st.com>
From:   Frank Rowand <frowand.list@gmail.com>
Message-ID: <f21ad44d-f119-2035-b4ee-16b3619879af@gmail.com>
Date:   Wed, 15 Jan 2020 20:28:10 -0600
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On 1/13/20 12:16 PM, Alexandre Torgue wrote:
> Hi,
> 
> The goal of this series is to add device tree build information in dtb.
> This information can be dtb build date, where devicetree files come from,
> who built the dtb ... Actually, same kind of information that you can find
> in the Linux banner which is printout during kernel boot. Having the same
> kind of information for device tree is useful for debugging and maintenance.
> 
> To achieve that a new option "-B" (using an argument) is added to dtc. 
> The argument is a file containing a string with build information
> (e.g., From Linux 5.5.0-rc1 by alex the Mon Jan 13 18:25:38 CET 2020).
> DTC use it to append dts file with a new string property "Build-info".
> 
> of/fdt.c is modified to printout "Build-info" property during Kernel boot and 
> scripts/Makefile.lib is modified to use dtc -B option during kernel make (this
> last part could be improved for sure).

Please read through the thread at:

  https://lore.kernel.org/linux-arm-kernel/550A42AC.8060104@gmail.com/

which was my attempt to do something similar.

-Frank

> 
> Regards
> Alex
> 
> Alexandre Torgue (3):
>   dtc: Add dtb build information option
>   of: fdt: print dtb build information
>   scripts: Use -B dtc option to generate dtb build information.
> 
>  drivers/of/fdt.c           |  9 +++++++
>  scripts/Makefile.lib       | 11 +++++---
>  scripts/dtc/dtc.c          | 55 +++++++++++++++++++++++++++++++++-----
>  scripts/gen_dtb_build_info | 11 ++++++++
>  4 files changed, 76 insertions(+), 10 deletions(-)
>  create mode 100755 scripts/gen_dtb_build_info
>