[v12,0/2] arm64: Add a build target for Flat Image Tree

Message

Simon Glass March 29, 2024, 3:28 a.m. UTC

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 v12:
- Avoid showing FIT message if V=0

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              |  16 ++
 scripts/make_fit.py               | 290 ++++++++++++++++++++++++++++++
 7 files changed, 337 insertions(+), 3 deletions(-)
 create mode 100755 scripts/make_fit.py

Comments

Will Deacon April 12, 2024, 4:06 p.m. UTC | #1

On Fri, 29 Mar 2024 16:28:34 +1300, Simon Glass wrote:
> 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.
> 
> [...]

Applied to arm64 (for-next/kbuild), thanks!

[1/2] arm64: Add BOOT_TARGETS variable
      https://git.kernel.org/arm64/c/0dc1670bd0ce
[2/2] arm64: boot: Support Flat Image Tree
      https://git.kernel.org/arm64/c/7a23b027ec17

Cheers,