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  <div class="section" id="configuring">
<span id="id1"></span><h1>Configuring<a class="headerlink" href="#configuring" title="Permalink to this headline">¶</a></h1>
<p>Apache NuttX is a very configurable operating system. Nearly all features can be configured in or
out of the system. This makes it possible to compile a build tailored for your hardware and
application. It also makes configuring the system complex at times.</p>
<p>There is a configuration system that can be used on the commandline or in a GUI. I’ve found
the easiest way to configured Apache NuttX is to use the <code class="docutils literal notranslate"><span class="pre">menuconfig</span></code> system. This is used
via a terminal program and allows quick access to all of Apache NuttX’s features via a system of
menus.</p>
<p>The Apache NuttX configuration system uses Linux’s
<a class="reference external" href="https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt">kconfig system</a> adapted for use with Apache
NuttX. Here’s info on Linux’s kconfig <a class="reference external" href="https://en.wikipedia.org/wiki/Menuconfig">menuconfig</a> system.</p>
<p>After you’ve configured your board (see <a class="reference internal" href="compiling.html#compiling"><span class="std std-ref">Compiling</span></a>), you can use the menuconfig system
to change the configuration. Once you’ve configured, you can compile to make a build that
has your configuration options selected.</p>
<ol class="arabic">
<li><p>Initialize Board Configuration</p>
<p>Here we’ll use the simulator since that’s the simplest to explain. You can do this with
any board and base configuration.  Note here you should be supplying <cite>configure.sh</cite> the correct flag
for your build environment:</p>
<blockquote>
<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>-l selects the Linux <span class="o">(</span>l<span class="o">)</span> host environment.
-m selects the macOS <span class="o">(</span>m<span class="o">)</span> host environment.
-c selects the Windows host and Cygwin <span class="o">(</span>c<span class="o">)</span> environment.
-g selects the Windows host and MinGW/MSYS environment.
-n selects the Windows host and Windows native <span class="o">(</span>n<span class="o">)</span> environment.
</pre></div>
</div>
</div></blockquote>
<p>Select the simulator configuration for a Linux host:</p>
<blockquote>
<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> nuttx
$ make distclean  <span class="c1"># make a clean start, clearing out old configurations</span>
$ ./tools/configure.sh -l sim:nsh
  Copy files
  Select <span class="nv">CONFIG_HOST_LINUX</span><span class="o">=</span>y
  Refreshing...
</pre></div>
</div>
</div></blockquote>
</li>
<li><p>Make</p>
<blockquote>
<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make clean<span class="p">;</span> make
$ ./nuttx
login:
</pre></div>
</div>
</div></blockquote>
<p>From another terminal window, kill the simulator:</p>
<blockquote>
<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ pkill nuttx
</pre></div>
</div>
</div></blockquote>
</li>
<li><p>Menu Configuration</p>
<p>Showing that <code class="docutils literal notranslate"><span class="pre">login:</span></code> is annyoing. Let’s use the <code class="docutils literal notranslate"><span class="pre">menuconfig</span></code> system to turn it off.</p>
<blockquote>
<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make menuconfig
</pre></div>
</div>
</div></blockquote>
<p>Here’s what you should see:</p>
<a class="reference internal image-reference" href="../_images/menuconfig.png"><img alt="Screenshot of menuconfig system main screen" class="align-center" src="../_images/menuconfig.png" style="width: 800px;" /></a>
<p><br/></p>
</li>
<li><p>Application Configuration</p>
<p>The NSH Login setting is under <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span> <span class="pre">&gt;</span> <span class="pre">NSH</span> <span class="pre">Library</span></code>. Use
the up and down arrows to navigate to <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span></code>; hit <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> to
select it. Now you’re in the <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span></code> menu. Use the arrows to go
down to <code class="docutils literal notranslate"><span class="pre">NSH</span> <span class="pre">Library</span></code> and select that. Now navigate down to <code class="docutils literal notranslate"><span class="pre">Console</span> <span class="pre">Login</span></code> and use
the spacebar to uncheck that setting (so that it has a blank space instead of a star in it).</p>
<p>Now let’s save. Use the right and left arrow keys to select the <code class="docutils literal notranslate"><span class="pre">Exit</span></code> menu item at the
bottom of the screen. Hit <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> to select it, hit <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> again, and again, finally
hitting <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> in the <code class="docutils literal notranslate"><span class="pre">Save</span> <span class="pre">Configuration</span></code> dialog box.</p>
</li>
<li><p>Make the New Configuration</p>
<blockquote>
<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make clean<span class="p">;</span> make
</pre></div>
</div>
</div></blockquote>
</li>
<li><p>Run</p>
<blockquote>
<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ./nuttx
NuttShell <span class="o">(</span>NSH<span class="o">)</span> NuttX-8.2
MOTD: <span class="nv">username</span><span class="o">=</span>admin <span class="nv">password</span><span class="o">=</span>Administrator
</pre></div>
</div>
</div></blockquote>
<p>Success!</p>
<p>If you find that message of the day (MOTD) annoying and want to turn that off, it’s
configured in <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span> <span class="pre">&gt;</span> <span class="pre">NSH</span> <span class="pre">Library</span> <span class="pre">&gt;&gt;</span> <span class="pre">Message</span> <span class="pre">of</span> <span class="pre">the</span> <span class="pre">Day</span> <span class="pre">(MOTD)</span></code>.</p>
</li>
</ol>
<hr class="docutils" />
<p>Next up is <a class="reference internal" href="debugging.html#debugging"><span class="std std-ref">Debugging</span></a>.</p>
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