linux-kernel - [PATCH v11 0/2] arm64: Add a build target for Flat Image Tree

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Date: Thu, 14 Mar 2024 17:26:57 +1300
From: Simon Glass <sjg@...omium.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: Ahmad Fatoum <a.fatoum@...gutronix.de>,
	Nicolas Schier <nicolas@...sle.eu>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Simon Glass <sjg@...omium.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Jonathan Corbet <corbet@....net>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Terrell <terrelln@...com>,
	Will Deacon <will@...nel.org>,
	linux-doc@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	workflows@...r.kernel.org
Subject: [PATCH v11 0/2] arm64: Add a build target for Flat Image Tree

Flat Image Tree (FIT) is a widely used file format for packaging a
kernel and associated devicetree files[1]. It is not specific to any
one bootloader, as it is supported by U-Boot, coreboot, Linuxboot,
Tianocore and Barebox.

This series adds support for building a FIT as part of the kernel
build. This makes it easy to try out the kernel - just load the FIT
onto your tftp server and it will run automatically on any supported
arm64 board.

The script is written in Python, since it is easy to build a FIT using
the Python libfdt bindings. For now, no attempt is made to compress
files in parallel, so building the 900-odd files takes a while, about
6 seconds with my testing.

The series also includes a minor clean-up patch.

[1] https://github.com/open-source-firmware/flat-image-tree

Changes in v11:
- Use dtbslist file in image.fit rule
- Update cmd_fit rule as per Masahiro
- Don't mention ignoring files without a .dtb prefix
- Use argparse fromfile_prefix_chars feature
- Add a -v option and use it for output (with make V=1)
- rename srcdir to dtbs
- Use -o for the output file instead of -f

Changes in v10:
- Make use of dtbs-list file
- Mention dtbs-list and FIT_COMPRESSION
- Update copyright year
- Update cover letter to take account of an applied patch

Changes in v9:
- Move the compression control into Makefile.lib

Changes in v8:
- Drop compatible string in FDT node
- Correct sorting of MAINTAINERS to before ARM64 PORT
- Turn compress part of the make_fit.py comment in to a sentence
- Add two blank lines before parse_args() and setup_fit()
- Use 'image.fit: dtbs' instead of BUILD_DTBS var
- Use '$(<D)/dts' instead of '$(dir $<)dts'
- Add 'mkimage' details Documentation/process/changes.rst
- Allow changing the compression used
- Tweak cover letter since there is only one clean-up patch

Changes in v7:
- Drop the kbuild tag
- Add Image as a dependency of image.fit
- Drop kbuild tag
- Add dependency on dtbs
- Drop unnecessary path separator for dtbs
- Rebase to -next

Changes in v6:
- Drop the unwanted .gz suffix

Changes in v5:
- Drop patch previously applied
- Correct compression rule which was broken in v4

Changes in v4:
- Use single quotes for UIMAGE_NAME

Changes in v3:
- Drop temporary file image.itk
- Drop patch 'Use double quotes for image name'
- Drop double quotes in use of UIMAGE_NAME
- Drop unnecessary CONFIG_EFI_ZBOOT condition for help
- Avoid hard-coding "arm64" for the DT architecture

Changes in v2:
- Drop patch previously applied
- Add .gitignore file
- Move fit rule to Makefile.lib using an intermediate file
- Drop dependency on CONFIG_EFI_ZBOOT
- Pick up .dtb files separately from the kernel
- Correct pylint too-many-args warning for write_kernel()
- Include the kernel image in the file count
- Add a pointer to the FIT spec and mention of its wide industry usage
- Mention the kernel version in the FIT description

Simon Glass (2):
  arm64: Add BOOT_TARGETS variable
  arm64: boot: Support Flat Image Tree

 Documentation/process/changes.rst |   9 +
 MAINTAINERS                       |   7 +
 arch/arm64/Makefile               |  11 +-
 arch/arm64/boot/.gitignore        |   1 +
 arch/arm64/boot/Makefile          |   6 +-
 scripts/Makefile.lib              |  15 ++
 scripts/make_fit.py               | 290 ++++++++++++++++++++++++++++++
 7 files changed, 336 insertions(+), 3 deletions(-)
 create mode 100755 scripts/make_fit.py

-- 
2.34.1