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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 <jdl@jdl.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 python-dev The library provides an Fdt class which you can use like this: $ PYTHONPATH=../pylibfdt python >>> import libfdt >>> fdt = libfdt.Fdt(open('test_tree1.dtb').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=%r' % (prop.name, prop.value) compatible=bytearray(b'subnode1\x00') >>> print '%s=%s' % (prop.name, prop.value) compatible=subnode1 >>> node2 = fdt.path_offset('/') >>> print fdt.getprop(node2, 'compatible') 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 $ python -c "import libfdt; help(libfdt)" If you add new features, please check code coverage: $ sudo apt-get install python-pip python-pytest $ sudo pip install coverage $ cd tests $ coverage run pylibfdt_tests.py $ coverage html # Open 'htmlcov/index.html' in your browser More work remains to support all of libfdt, including access to numeric values. 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
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