155 lines
4.7 KiB
ReStructuredText
155 lines
4.7 KiB
ReStructuredText
.. include:: /substitutions.rst
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.. _configuring:
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Configuring
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===========
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Apache NuttX is a very configurable: nearly all features can be configured in or
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out of the system. This makes it possible to compile a build tailored for your
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hardware and application.
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The Apache NuttX configuration system uses Linux's
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`kconfig system <https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt>`_ which
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includes various frontends that allow you to modify configuration easily. Usually, the ``menuconfig``
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frontend is used, which is a console based menu system (more info `here <https://en.wikipedia.org/wiki/Menuconfig>`_).
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As previously explained in :doc:`compiling`, the first step is to load a premade configuration for
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your board. Then, you can modify this configuration to your liking. In this example, we will show
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how you modify the default configuration of the ``sim`` build, a build of NuttX which runs on your own
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computer.
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#. Initialize Board Configuration
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.. code-block:: console
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$ cd nuttx
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$ ./tools/configure.sh -l sim:nsh
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Copy files
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Select CONFIG_HOST_LINUX=y
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Refreshing...
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#. Build & run
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.. code-block:: console
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$ make clean; make
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$ ./nuttx
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login: admin
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password: Administrator
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User Logged-in!
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nsh>
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From another terminal window, kill the simulator:
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.. code-block:: console
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$ pkill nuttx
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#. Modify configuration
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In this case we will remove the login feature (which will boot straight to the prompt). To
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do so, we use the ``menuconfig`` frontend.
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.. code-block:: console
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$ make menuconfig
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Here's what you should see:
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.. image:: ../_static/images/menuconfig.png
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:width: 800px
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:align: center
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:alt: Screenshot of menuconfig system main screen
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The NSH Login setting is under :menuselection:`Application Configuration --> NSH Library`. You
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can use :kbd:`🢁` and :kbd:`🢃` keys to navigate and :kbd:`↵` to enter a submenu.
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To disable the corresponding setting go to :menuselection:`Console Login` and press :kbd:`spacebar` to
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it (so that it has a blank space instead of a star in it).
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Now you need to exit ``menuconfig`` and save the modified configuration. Use the :kbd:`🡸` and
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:kbd:`🡺` arrow keys to navigate the lower menu. If you select :menuselection:`Exit` you will be
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prompted to save the config.
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#. Build with the new Configuration
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.. code-block:: console
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$ make
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#. Run
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.. code-block:: console
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$ ./nuttx
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NuttShell (NSH) NuttX-8.2
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MOTD: username=admin password=Administrator
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Success!
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.. tip::
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If you find that message of the day (MOTD) annoying and want to turn that off, it's
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configured in :menuselection:`Application Configuration --> NSH Library --> Message of the Day (MOTD)`.
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Fast configuration changes
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--------------------------
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If you know exactly which configuration symbol you want to change, you can use the ``kconfig-tweak`` tool (comes with the ``kconfig-frontends`` package) to quickly change a setting without going into the configuration frontend. This is useful to change settings such as debug options:
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.. code-block:: console
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$ kconfig-tweak --disable CONFIG_DEBUG_NET
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$ make olddefconfig # needed to have the kconfig system check the config
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$ kconfig-tweak --enable CONFIG_DEBUG_NET
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$ make olddefconfig
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This is also useful to script configuration changes that you perform often:
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.. code-block:: bash
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#!/bin/bash
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kconfig-tweak --disable CONFIG_DEBUG_ALERT
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kconfig-tweak --disable CONFIG_DEBUG_FEATURES
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kconfig-tweak --disable CONFIG_DEBUG_ERROR
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kconfig-tweak --disable CONFIG_DEBUG_WARN
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kconfig-tweak --disable CONFIG_DEBUG_INFO
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kconfig-tweak --disable CONFIG_DEBUG_ASSERTIONS
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kconfig-tweak --disable CONFIG_DEBUG_NET
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kconfig-tweak --disable CONFIG_DEBUG_NET_ERROR
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kconfig-tweak --disable CONFIG_DEBUG_NET_WARN
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kconfig-tweak --disable CONFIG_DEBUG_NET_INFO
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kconfig-tweak --disable CONFIG_DEBUG_SYMBOLS
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kconfig-tweak --disable CONFIG_DEBUG_NOOPT
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kconfig-tweak --disable CONFIG_SYSLOG_TIMESTAMP
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make oldconfig
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Reference configuration
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--------------------------
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Defconfig supports the use of ``#include`` statements to reference other configuration files:
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.. code-block::
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CONFIG_XXX1=y
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CONFIG_XXX2=y
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#include "configs/system.config"
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#include "configs/net.config"
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The default header file search path includes:
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* Current directory;
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* ``${boards}/configs/common``;
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* ``${boards}/common/configs``;
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Merge configuration
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--------------------------
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Multiple config fragments can be merged manually using the tools/merge_config.py script.
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.. code-block:: console
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$ cd nuttx
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$ ./tools/merge_config.py -o defconfig .config1 .config2
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