linux-kernel - Re: [PATCH 1/2] scripts/make_fit: Drop fdt image entry compatible string

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Date: Thu, 23 May 2024 11:19:01 -0600
From: Simon Glass <sjg@...omium.org>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 1/2] scripts/make_fit: Drop fdt image entry compatible string

Hi Chen-Yu,

On Tue, 21 May 2024 at 00:51, Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> According to the FIT image spec, the compatible string in the fdt image

Can you please add a link to where it says this in the spec? I cannot
find it after a short search.

I believe this patch is correct. Since the information is in the
configuration node it does not need to be in the FDT.

> node or any image node specifies the method to load the image, not the
> compatible string embedded in the FDT or used for matching.
>
> Drop the compatible string from the fdt image entry node.
>
> While at it also fix up a typo in the document section of output_dtb.
>
> Fixes: 7a23b027ec17 ("arm64: boot: Support Flat Image Tree")
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> ---
>  scripts/make_fit.py | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/scripts/make_fit.py b/scripts/make_fit.py
> index 3de90c5a094b..263147df80a4 100755
> --- a/scripts/make_fit.py
> +++ b/scripts/make_fit.py
> @@ -190,7 +190,7 @@ def output_dtb(fsw, seq, fname, arch, compress):
>      Args:
>          fsw (libfdt.FdtSw): Object to use for writing
>          seq (int): Sequence number (1 for first)
> -        fmame (str): Filename containing the DTB
> +        fname (str): Filename containing the DTB
>          arch: FIT architecture, e.g. 'arm64'
>          compress (str): Compressed algorithm, e.g. 'gzip'
>
> @@ -211,7 +211,6 @@ def output_dtb(fsw, seq, fname, arch, compress):
>          fsw.property_string('type', 'flat_dt')
>          fsw.property_string('arch', arch)
>          fsw.property_string('compression', compress)
> -        fsw.property('compatible', bytes(compat))
>
>          with open(fname, 'rb') as inf:
>              compressed = compress_data(inf, compress)
> --
> 2.45.0.215.g3402c0e53f-goog
>

Regards,
Simon