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From: Simon Glass <sjg@chromium.org>
Date: Fri, 24 May 2024 07:01:06 -0600
Message-ID: <CAFLszTjeQdwEp1AgL8geK7AZFwQqDfTkdzj4V2JkYqU4F7Em4Q@mail.gmail.com>
Subject: Re: [PATCH 1/2] scripts/make_fit: Drop fdt image entry compatible string
To: Chen-Yu Tsai <wenst@chromium.org>
Cc: wens@kernel.org, Masahiro Yamada <masahiroy@kernel.org>, 
	Nathan Chancellor <nathan@kernel.org>, Nicolas Schier <nicolas@fjasle.eu>, 
	linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, 
	linux-kbuild@vger.kernel.org
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Hi ChenYu,

On Fri, 24 May 2024 at 00:30, Chen-Yu Tsai <wenst@chromium.org> wrote:
>
> Hi Simon,
>
> On Fri, May 24, 2024 at 1:38=E2=80=AFAM Simon Glass <sjg@chromium.org> wr=
ote:
> >
> > Hi ChenYu,
> >
> > On Thu, 23 May 2024 at 11:30, Chen-Yu Tsai <wens@kernel.org> wrote:
> > >
> > > On Fri, May 24, 2024 at 1:19=E2=80=AFAM Simon Glass <sjg@chromium.org=
> wrote:
> > > >
> > > > Hi Chen-Yu,
> > > >
> > > > On Tue, 21 May 2024 at 00:51, Chen-Yu Tsai <wenst@chromium.org> wro=
te:
> > > > >
> > > > > 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 cann=
ot
> > > > 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/sou=
rce/chapter2-source-file-format.rst?plain=3D1#L343

I see that but I am suggesting that it could explicitly mention that
the FDT should not have a compatible string for the model...that
should only be in the configuration node.

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

Yes mostly it is the same, but there were some changes. It has evolved
slowly over the years but the bones of it is stable.

Regards,
Simon

>
>
> 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, no=
t 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@chromium.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, compres=
s):
> > > > >      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, compres=
s):
> > > > >          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 =3D compress_data(inf, compress)
> > > > > --
> > > > > 2.45.0.215.g3402c0e53f-goog
> > > > >
> > > >
> > > > Regards,
> > > > Simon
> > > >
> > > > _______________________________________________
> > > > linux-arm-kernel mailing list
> > > > linux-arm-kernel@lists.infradead.org
> > > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel