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| <section id="device-tree"> |
| <h1>Device Tree<a class="headerlink" href="#device-tree" title="Permalink to this heading"></a></h1> |
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| <h2>Overview<a class="headerlink" href="#overview" title="Permalink to this heading"></a></h2> |
| <p>Currently, NuttX supports parsing of FDT(Flattened Device Tree) using libfdt, a |
| utility library for reading and manipulating the binary format:</p> |
| <p><a class="reference external" href="https://github.com/dgibson/dtc/">https://github.com/dgibson/dtc/</a></p> |
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| Device Tree support in NuttX will reduce the configuration of chips/boards, |
| it is not used in NuttX kernel framework yet.</p> |
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| <li><p>Enable Device Tree and libfdt</p></li> |
| </ol> |
| <p>Enable the Kconfig settings:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">CONFIG_DEVICE_TREE=y /* Enable Device Tree */</span> |
| <span class="go">CONFIG_LIBFDT=y /* Enable utility library */</span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <ol class="arabic simple" start="2"> |
| <li><p>Register the DTB address</p></li> |
| </ol> |
| <p>Use fdt_register to set the DTB Address in NuttX</p> |
| <ol class="arabic simple" start="3"> |
| <li><p>Parse the DTB</p></li> |
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| <p>Chip/board will use fdt_get to get the DTB Address, and then use fdt_* APIs to |
| parse the DTB properties.</p> |
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