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

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Message-ID: <CAGXv+5Eajy55kAcNzyZtsp9MJhD7EnNONW-JYsoadctaTjnxgA@mail.gmail.com>
Date: Fri, 24 May 2024 14:29:53 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Simon Glass <sjg@...omium.org>
Cc: wens@...nel.org, 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 Simon,

On Fri, May 24, 2024 at 1:38 AM Simon Glass <sjg@...omium.org> wrote:
>
> Hi ChenYu,
>
> On Thu, 23 May 2024 at 11:30, Chen-Yu Tsai <wens@...nel.org> wrote:
> >
> > On Fri, May 24, 2024 at 1:19 AM Simon Glass <sjg@...omium.org> wrote:
> > >
> > > 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.
> >
> > (Quick reply from my other email before I forget.)
> >
> > From the FIT source file format document, found in U-boot source
> > "doc/usage/fit/source_file_format.rst", or on the website:
> > https://docs.u-boot.org/en/latest/usage/fit/source_file_format.html
> >
> > Under "'/images' node" -> "Conditionally mandatory property", the
> > "compatible" property is described as "compatible method for loading image."
> >
> > I'll add the reference in the next version.
>
> OK thank you.
>
> There is also a spec version at [1] - it might be worth adding mention
> of this explicitly for the fdt nodes.

It seems that this is already mentioned?

See https://github.com/open-source-firmware/flat-image-tree/blob/main/source/chapter2-source-file-format.rst?plain=1#L343

It looks like it was copied from U-boot directly.

Regards,
ChenYu

> Regards,
> Simon
>
> [1] https://github.com/open-source-firmware/flat-image-tree/
>
> >
> >
> > ChenYu
> >
> > > 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
> > >
> > > _______________________________________________
> > > linux-arm-kernel mailing list
> > > linux-arm-kernel@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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