1 The source tree contains the Device Tree Compiler (dtc) toolchain for 2 working with device tree source and binary files and also libfdt, a 3 utility library for reading and manipulating the binary format. 4 5 DTC and LIBFDT are maintained by: 6 7 David Gibson <david (a] gibson.dropbear.id.au> 8 Jon Loeliger <jdl (a] jdl.com> 9 10 11 Python library 12 -------------- 13 14 A Python library is also available. To build this you will need to install 15 swig and Python development files. On Debian distributions: 16 17 sudo apt-get install swig python-dev 18 19 The library provides an Fdt class which you can use like this: 20 21 $ PYTHONPATH=../pylibfdt python 22 >>> import libfdt 23 >>> fdt = libfdt.Fdt(open('test_tree1.dtb').read()) 24 >>> node = fdt.path_offset('/subnode@1') 25 >>> print node 26 124 27 >>> prop_offset = fdt.first_property_offset(node) 28 >>> prop = fdt.get_property_by_offset(prop_offset) 29 >>> print '%s=%r' % (prop.name, prop.value) 30 compatible=bytearray(b'subnode1\x00') 31 >>> print '%s=%s' % (prop.name, prop.value) 32 compatible=subnode1 33 >>> node2 = fdt.path_offset('/') 34 >>> print fdt.getprop(node2, 'compatible') 35 test_tree1 36 37 You will find tests in tests/pylibfdt_tests.py showing how to use each 38 method. Help is available using the Python help command, e.g.: 39 40 $ cd pylibfdt 41 $ python -c "import libfdt; help(libfdt)" 42 43 If you add new features, please check code coverage: 44 45 $ sudo apt-get install python-pip python-pytest 46 $ sudo pip install coverage 47 $ cd tests 48 $ coverage run pylibfdt_tests.py 49 $ coverage html 50 # Open 'htmlcov/index.html' in your browser 51 52 53 To install the library via the normal setup.py method, use: 54 55 ./pylibfdt/setup.py [--prefix=/path/to/install_dir] 56 57 If --prefix is not provided, the default prefix is used, typically '/usr' 58 or '/usr/local'. See Python's distutils documentation for details. You can 59 also install via the Makefile if you like, but the above is more common. 60 61 To install both libfdt and pylibfdt you can use: 62 63 make install [SETUP_PREFIX=/path/to/install_dir] \ 64 [PREFIX=/path/to/install_dir] 65 66 To disable building the python library, even if swig and Python are available, 67 use: 68 69 make NO_PYTHON=1 70 71 72 More work remains to support all of libfdt, including access to numeric 73 values. 74 75 76 Mailing list 77 ------------ 78 The following list is for discussion about dtc and libfdt implementation 79 mailto:devicetree-compiler (a] vger.kernel.org 80 81 Core device tree bindings are discussed on the devicetree-spec list: 82 mailto:devicetree-spec (a] vger.kernel.org 83
