[v3,0/2] arm64: Add a build target for Flat Image Tree

Message

Simon Glass Nov. 7, 2023, 1:25 p.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 few minor clean-up patches.

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

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):
  kbuild: arm64: Add BOOT_TARGETS variable
  arm64: boot: Support Flat Image Tree

 MAINTAINERS                |   7 +
 arch/arm64/Makefile        |   7 +-
 arch/arm64/boot/.gitignore |   1 +
 arch/arm64/boot/Makefile   |   6 +-
 scripts/Makefile.lib       |  16 ++
 scripts/make_fit.py        | 289 +++++++++++++++++++++++++++++++++++++
 6 files changed, 324 insertions(+), 2 deletions(-)
 create mode 100755 scripts/make_fit.py