linux-kernel - [PATCH v7 0/6] scripts/make_fit: Support ramdisks and faster operations

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Message-ID: <20251211140309.1910613-1-sjg@chromium.org>
Date: Thu, 11 Dec 2025 07:02:57 -0700
From: Simon Glass <sjg@...omium.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: Nicolas Schier <nicolas@...sle.eu>,
	Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	J . Neuschäfer <j.ne@...teo.net>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Tom Rini <trini@...sulko.com>,
	Ahmad Fatoum <a.fatoum@...gutronix.de>,
	Chen-Yu Tsai <wenst@...omium.org>,
	Simon Glass <sjg@...omium.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	David Sterba <dsterba@...e.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Kees Cook <kees@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Terrell <terrelln@...com>,
	Nicolas Schier <nsc@...nel.org>,
	Oleh Zadorozhnyi <lesorubshayan@...il.com>,
	Petr Mladek <pmladek@...e.com>,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v7 0/6] scripts/make_fit: Support ramdisks and faster operations

This series updates 'make image.fit' to support adding a ramdisk to the
FIT, provided as a parameter.

It also includes a few performance improvement, so that building a FIT
from ~450MB of kernel/module/devicetree files only takes a few seconds
on a modern machine.

For this version I have dropped inclusion of built modules, as there is
still more discussion to happen in that area.

Changes in v7:
- Add a note about the " -> ' change
- Add a new patch with the MAKE_FIT_FLAGS change
- Mention xz as well, in the commit message
- Drop patch 'scripts/make_fit: Provide a way to add built modules'
- Drop patch 'kbuild: Split out module targets into a variable'
- Drop patch 'kbuild: Allow adding modules into the FIT ramdisk'

Changes in v6:
- Drop the load address for ramdisk, as it is not needed
- Bring back the ramdisk 'compression' property, set to 'none'

Changes in v5:
- Fix 'use' typo

Changes in v4:
- Update the commit message

Changes in v3:
- Move the ramdisk chunk into the correct patch
- Add a comment at the top of the file about the -r option
- Count the ramdisk in the total files
- Update the commit message

Changes in v2:
- Don't compress the ramdisk as it is already compressed

Simon Glass (6):
  scripts/make_fit: Speed up operation
  scripts/make_fit: Support an initial ramdisk
  scripts/make_fit: Move dtb processing into a function
  kbuild: Support a MAKE_FIT_FLAGS environment variable
  scripts/make_fit: Support a few more parallel compressors
  scripts/make_fit: Compress dtbs in parallel

 scripts/Makefile.lib |   2 +-
 scripts/make_fit.py  | 179 ++++++++++++++++++++++++++++++++++---------
 2 files changed, 145 insertions(+), 36 deletions(-)

-- 
2.43.0

base-commit: d358e5254674b70f34c847715ca509e46eb81e6f
branch: fita7