u-boot/scripts/dtc
Simon Glass 48bf738e36 Allow Python packages to be dropped
When building in a portage chroot, we do not have the environment needed
to build pylibfdt. It is instead build as a separate package.

Provide a build option to tell U-Boot to skip this part of the build. We
still need it to use binman, etc. but don't need it to build its
dependencies.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
[s/build bytes/builds bytes in tools.rst]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2023-09-22 06:03:46 +08:00
..
libfdt scripts: dtc: libfdt: fdt_ro.c: always define fdt_check_full 2022-02-22 10:05:44 -07:00
pylibfdt pylibfdt: Allow version normalization to fail 2023-01-07 18:02:26 -05:00
.gitignore scripts/dtc: Re-sync with Linux 4.17-rc4 2018-05-31 08:53:11 -04:00
checks.c scripts/dtc: Update to upstream version v1.4.6-21-g84e414b0b5bc 2020-03-16 18:54:18 -04:00
data.c scripts/dtc: Update to upstream version v1.4.4 2017-09-23 17:33:06 -04:00
dtc-lexer.l dtc: add ability to make nodes conditional on them being referenced 2020-02-05 19:33:46 -07:00
dtc-parser.y scripts/dtc: Update to upstream version v1.4.6-21-g84e414b0b5bc 2020-03-16 18:54:18 -04:00
dtc.c scripts/dtc: Update to upstream version v1.4.6-9-gaadd0b65c987 2018-05-31 08:53:11 -04:00
dtc.h dtc: add ability to make nodes conditional on them being referenced 2020-02-05 19:33:46 -07:00
flattree.c scripts/dtc: Update to upstream version v1.4.6-9-gaadd0b65c987 2018-05-31 08:53:11 -04:00
fstree.c scripts/dtc: Update to upstream version v1.4.3 2017-09-23 17:33:03 -04:00
livetree.c scripts/dtc: Update to upstream version v1.4.6-21-g84e414b0b5bc 2020-03-16 18:54:18 -04:00
Makefile Allow Python packages to be dropped 2023-09-22 06:03:46 +08:00
Makefile.dtc scripts/dtc: Update to upstream version v1.4.3 2017-09-23 17:33:03 -04:00
README fdt: Move to setuptools 2022-10-29 07:36:33 -06:00
srcpos.c doc: replace @return by Return: 2022-01-19 18:11:34 +01:00
srcpos.h doc: replace @return by Return: 2022-01-19 18:11:34 +01:00
treesource.c WS cleanup: remove trailing empty lines 2021-09-30 08:08:56 -04:00
update-dtc-source.sh scripts/dtc: Re-sync with Linux 4.17-rc4 2018-05-31 08:53:11 -04:00
util.c scripts/dtc: Update to upstream version v1.4.4 2017-09-23 17:33:06 -04:00
util.h doc: replace @return by Return: 2022-01-19 18:11:34 +01:00
version_gen.h scripts/dtc: Update to upstream version v1.4.6-21-g84e414b0b5bc 2020-03-16 18:54:18 -04:00

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:

David Gibson <david@gibson.dropbear.id.au>
Jon Loeliger <loeliger@gmail.com>


Python library
--------------

A Python library 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.


Adding a new function to libfdt.h
---------------------------------

The shared library uses libfdt/version.lds to list the exported functions, so
add your new function there. Check that your function works with pylibfdt. If
it cannot be supported, put the declaration in libfdt.h behind #ifndef SWIG so
that swig ignores it.


Tests
-----

Test files are kept in the tests/ directory. Use 'make check' to build and run
all tests.

If you want to adjust a test file, be aware that tree_tree1.dts is compiled
and checked against a binary tree from assembler macros in trees.S. So
if you change that file you must change tree.S also.


Mailing list
------------
The following list is for discussion about dtc and libfdt implementation
mailto:devicetree-compiler@vger.kernel.org

Core device tree bindings are discussed on the devicetree-spec list:
mailto:devicetree-spec@vger.kernel.org