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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/build/gcc.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/doc/build/gcc.rst b/doc/build/gcc.rst index 0cdc307d57..6c4b4ad7a0 100644 --- a/doc/build/gcc.rst +++ b/doc/build/gcc.rst @@ -120,6 +120,27 @@ Further important build parameters are * O=<dir> - generate all output files in directory <dir>, including .config * V=1 - verbose build +Devicetree compiler +~~~~~~~~~~~~~~~~~~~ + +Boards that use `CONFIG_OF_CONTROL` (i.e. almost all of them) need the +devicetree compiler (dtc). Those with `CONFIG_PYLIBFDT` need pylibfdt, a Python +library for accessing devicetree data. Suitable versions of these are included +in the U-Boot tree in `scripts/dtc` and built automatically as needed. + +To use the system versions of these, use the DTC parameter, for example + +.. code-block:: bash + + DTC=/usr/bin/dtc make + +In this case, dtc and pylibfdt are not built. The build checks that the version +of dtc is new enough. It also makes sure that pylibfdt is present, if needed +(see `scripts_dtc` in the Makefile). + +Note that the :doc:`tools` are always built with the included version of libfdt +so it is not possible to build U-Boot tools with a system libfdt, at present. + Other build targets ~~~~~~~~~~~~~~~~~~~ |