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qemu / dtc / f1657b2fb5be12d85ceb6a50d2db8a006dee830c
commitf1657b2fb5be12d85ceb6a50d2db8a006dee830c[log] [tgz]
authorJohannes Beisswenger <johannes.beisswenger@cetitec.com>Fri Apr 14 15:17:34 2023 +0200
committerDavid Gibson <david@gibson.dropbear.id.au>Sun May 07 18:47:40 2023 +1000
treece8459f9beb12885c5d27dac6cd3fe752f0abb13
parent44bb89cafd3d96b8df0f324b652c7bf804b38c05 [diff]
tests: Add test cases for bad endpoint node and remote-endpoint prop checks

Signed-off-by: Johannes Beisswenger <johannes.beisswenger@cetitec.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
5 files changed
tree: ce8459f9beb12885c5d27dac6cd3fe752f0abb13
  1. Documentation/
  2. libfdt/
  3. pylibfdt/
  4. scripts/
  5. tests/
  6. .cirrus.yml
  7. .editorconfig
  8. .gitignore
  9. .travis.yml
  10. BSD-2-Clause
  11. checks.c
  12. CONTRIBUTING.md
  13. convert-dtsv0-lexer.l
  14. data.c
  15. dtc-lexer.l
  16. dtc-parser.y
  17. dtc.c
  18. dtc.h
  19. dtdiff
  20. fdtdump.c
  21. fdtget.c
  22. fdtoverlay.c
  23. fdtput.c
  24. flattree.c
  25. fstree.c
  26. GPL
  27. livetree.c
  28. Makefile
  29. Makefile.convert-dtsv0
  30. Makefile.dtc
  31. Makefile.utils
  32. MANIFEST.in
  33. meson.build
  34. meson_options.txt
  35. README.license
  36. README.md
  37. setup.py
  38. srcpos.c
  39. srcpos.h
  40. TODO
  41. treesource.c
  42. util.c
  43. util.h
  44. version_gen.h.in
  45. 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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