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qemu / dtc / 1df7b047fe437708c70cbd2262557d19e40022a6
commit1df7b047fe437708c70cbd2262557d19e40022a6[log] [tgz]
authorDan Horák <dan@danny.cz>Thu Jun 27 17:32:37 2024 +0200
committerDavid Gibson <david@gibson.dropbear.id.au>Sat Jul 06 15:58:06 2024 +1000
tree58cfe7f05b1d8da9d332c06681fc2369a4f01348
parent61e88fdcec522c42320a7d97cd528edf3631ee41 [diff]
pylibfdt/Makefile.pylibfdt: use project's flags to compile the extension

Seems the project's CFLAGS are not used when compiling the python
extension's C code via the setup.py script. Some default flags are used
instead. Thus pass the CFLAGS explicitly. Unfortunately the SWIG generated
code is not clean and requires -Wno-error override to compile successfully,
because -Werror is used in the project's flags.

Signed-off-by: Dan Horák <dan@danny.cz>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed
tree: 58cfe7f05b1d8da9d332c06681fc2369a4f01348
  1. .github/
  2. Documentation/
  3. libfdt/
  4. pylibfdt/
  5. scripts/
  6. tests/
  7. .editorconfig
  8. .gitignore
  9. BSD-2-Clause
  10. checks.c
  11. CONTRIBUTING.md
  12. convert-dtsv0-lexer.l
  13. data.c
  14. dtc-lexer.l
  15. dtc-parser.y
  16. dtc.c
  17. dtc.h
  18. dtdiff
  19. fdtdump.c
  20. fdtget.c
  21. fdtoverlay.c
  22. fdtput.c
  23. flattree.c
  24. fstree.c
  25. GPL
  26. livetree.c
  27. Makefile
  28. Makefile.convert-dtsv0
  29. Makefile.dtc
  30. Makefile.utils
  31. MANIFEST.in
  32. meson.build
  33. meson_options.txt
  34. README.license
  35. README.md
  36. setup.py
  37. srcpos.c
  38. srcpos.h
  39. TODO
  40. treesource.c
  41. util.c
  42. util.h
  43. VERSION.txt
  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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