linux-kernel - Re: [PATCH v3 5/5] kbuild: Allow adding modules into the FIT ramdisk

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Message-ID: <CAFLszTjZX4raMaxG0mk1Tbborh8=ZBJWSCxAL_=4H-G1fQ6f-Q@mail.gmail.com>
Date: Tue, 23 Sep 2025 05:41:25 -0600
From: Simon Glass <sjg@...omium.org>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: linux-arm-kernel@...ts.infradead.org, Nicolas Schier <nicolas@...sle.eu>, 
	Tom Rini <trini@...sulko.com>, Ahmad Fatoum <a.fatoum@...gutronix.de>, 
	J . Neuschäfer <j.ne@...teo.net>, 
	Masahiro Yamada <masahiroy@...nel.org>, Chen-Yu Tsai <wenst@...omium.org>, 
	Ard Biesheuvel <ardb@...nel.org>, Han Shen <shenhan@...gle.com>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Kees Cook <kees@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas.schier@...ux.dev>, Rong Xu <xur@...gle.com>, 
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] kbuild: Allow adding modules into the FIT ramdisk

Hi Randy,

On Mon, 22 Sept 2025 at 17:08, Randy Dunlap <rdunlap@...radead.org> wrote:
>
> Hi,
>
> On 9/22/25 3:48 PM, Simon Glass wrote:
> > Support 'make image.fit FIT_MODULES=1' to put all the modules into a
> > ramdisk image within the FIT.
> >
> > Signed-off-by: Simon Glass <sjg@...omium.org>
> > Suggested-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> > ---
>
> Regarding $subject, a comment in scripts/make_fit.py says:
>
>   Note that this tool does not yet support adding a ramdisk / initrd.
>
> Is the comment incorrect or are you changing that feature here?

I am changing it (in patch 2 of this series).

Regards,
Simon

>
> Thanks.
>
> >
> > (no changes since v1)
> >
> >  scripts/Makefile.lib | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> > index 1d581ba5df66..2e880d9b4706 100644
> > --- a/scripts/Makefile.lib
> > +++ b/scripts/Makefile.lib
> > @@ -398,9 +398,15 @@ MAKE_FIT := $(srctree)/scripts/make_fit.py
> >  # Use this to override the compression algorithm
> >  FIT_COMPRESSION ?= gzip
> >
> > +# Set this to 1 to include an initrd with all the kernel modules
> > +FIT_MODULES ?= 0
> > +ifeq ($(FIT_MODULES),1)
> > +EXTRA := -B $(objtree) -m
> > +endif
> > +
> >  quiet_cmd_fit = FIT     $@
> >        cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \
> > -             --name '$(UIMAGE_NAME)' \
> > +             --name '$(UIMAGE_NAME)' $(EXTRA) \
> >               $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \
> >               $(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \
> >               --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
>
> --
> ~Randy
>