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 few minor clean-up patches.
[1] https://github.com/open-source-firmware/flat-image-tree
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 | 291 ++++++++++++++++++++++++++++++ 7 files changed, 338 insertions(+), 3 deletions(-) create mode 100755 scripts/make_fit.py