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qemu / dtc / refs/heads/master
commit9197f1ccd95c9475006677aa97bf39727c1e8aa5[log] [tgz]
authorAndrew Davis <afd@ti.com>Fri Aug 22 12:10:38 2025 -0500
committerDavid Gibson <david@gibson.dropbear.id.au>Mon Aug 25 11:39:08 2025 +1000
treec7c2f8e8ffd5ed5c6ec58843212e04343a2f253e
parente1284ee5dc20f94097bc6424ede9c3e433dba77d [diff]
checks: Do not check overlays for alias paths

The path given as an alias inside an overlay can be a path to a node
in the base DT. The path check searches only the overlay as that is
the only tree available leading to false check failures.

Skip this check when checking an overlay.

Signed-off-by: Andrew Davis <afd@ti.com>
Message-ID: <20250822171038.190122-1-afd@ti.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed
tree: c7c2f8e8ffd5ed5c6ec58843212e04343a2f253e
  1. .github/
  2. Documentation/
  3. libfdt/
  4. pylibfdt/
  5. scripts/
  6. tests/
  7. .cirrus.yml
  8. .clang-format
  9. .editorconfig
  10. .gitignore
  11. .gitlab-ci.yml
  12. BSD-2-Clause
  13. checks.c
  14. CONTRIBUTING.md
  15. convert-dtsv0-lexer.l
  16. data.c
  17. dtc-lexer.l
  18. dtc-parser.y
  19. dtc.c
  20. dtc.h
  21. dtdiff
  22. fdtdump.c
  23. fdtget.c
  24. fdtoverlay.c
  25. fdtput.c
  26. flattree.c
  27. fstree.c
  28. GPL
  29. livetree.c
  30. Makefile
  31. Makefile.convert-dtsv0
  32. Makefile.dtc
  33. Makefile.utils
  34. meson.build
  35. meson_options.txt
  36. pyproject.toml
  37. README.license
  38. README.md
  39. srcpos.c
  40. srcpos.h
  41. TODO
  42. treesource.c
  43. util.c
  44. util.h
  45. VERSION.txt
  46. version_gen.h.in
  47. yamltree.c
README.md

Device Tree Compiler and libfdt

The source tree contains the Device Tree Compiler (dtc) toolchain for working with device tree source and binary files and also libfdt, a utility library for reading and manipulating the binary format.

dtc and libfdt are maintained by:

Python library

A Python library wrapping libfdt is also available. To build this you will need to install swig and Python development files. On Debian distributions:

$ sudo apt-get install swig python3-dev

The library provides an Fdt class which you can use like this:

$ PYTHONPATH=../pylibfdt python3
>>> import libfdt
>>> fdt = libfdt.Fdt(open('test_tree1.dtb', mode='rb').read())
>>> node = fdt.path_offset('/subnode@1')
>>> print(node)
124
>>> prop_offset = fdt.first_property_offset(node)
>>> prop = fdt.get_property_by_offset(prop_offset)
>>> print('%s=%s' % (prop.name, prop.as_str()))
compatible=subnode1
>>> node2 = fdt.path_offset('/')
>>> print(fdt.getprop(node2, 'compatible').as_str())
test_tree1

You will find tests in tests/pylibfdt_tests.py showing how to use each method. Help is available using the Python help command, e.g.:

$ cd pylibfdt
$ python3 -c "import libfdt; help(libfdt)"

If you add new features, please check code coverage:

$ sudo apt-get install python3-coverage
$ cd tests
# It's just 'coverage' on most other distributions
$ python3-coverage run pylibfdt_tests.py
$ python3-coverage html
# Open 'htmlcov/index.html' in your browser

The library can be installed with pip from a local source tree:

$ pip install . [--user|--prefix=/path/to/install_dir]

Or directly from a remote git repo:

$ pip install git+git://git.kernel.org/pub/scm/utils/dtc/dtc.git@main

The install depends on libfdt shared library being installed on the host system first. Generally, using --user or --prefix is not necessary and pip will use the default location for the Python installation which varies if the user is root or not.

You can also install everything via make if you like, but pip is recommended.

To install both libfdt and pylibfdt you can use:

$ make install [PREFIX=/path/to/install_dir]

To disable building the python library, even if swig and Python are available, use:

$ make NO_PYTHON=1

More work remains to support all of libfdt, including access to numeric values.

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