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| <li class="toctree-l2"><a class="reference internal" href="smaller_vector_tables.html">Smaller Vector Tables</a></li> |
| <li class="toctree-l2 current"><a class="current reference internal" href="#">How to port</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="port_bootsequence.html">The diagram of boot sequence</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="port_relatedkernelconfigrations.html">The list of related kernel configurations</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#porting-procedure">Porting procedure</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="#porting-case-studies">Porting Case Studies</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="porting-case-studies/bcm2711-rpi4b.html">Porting to the BCM2711 (Raspberry Pi 4B)</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="porting-case-studies/port_arm_cm4.html">The case of ARM CM4 & cxd32xx @NuttX12.4.0</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="updating_release_system_elf.html">Updating a Release System with ELF Programs</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="fully_linked_elf.html">ELF Programs – No Symbol Tables</a></li> |
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| <section id="how-to-port"> |
| <h1>How to port<a class="headerlink" href="#how-to-port" title="Permalink to this heading"></a></h1> |
| <p>This guide explains “How to port NuttX”.</p> |
| <p>At this guide, the scope of porting is adding a new SoC or board directory, |
| which can be built and has a working example that boots to the NuttShell (NSH).</p> |
| <p>The goal of porting is to confirm the booting NuttShell(NSH), the pass of “ostest” |
| and the timer.</p> |
| <p>Porting a new SoC and board to NuttX requires modifications on arch, |
| SoC and board directories. |
| For the details, |
| see <a class="reference internal" href="../quickstart/organization.html"><span class="doc">Directory Structure</span></a>, |
| <a class="reference internal" href="../components/arch/index.html"><span class="doc">Architecture-Specific Code</span></a>, |
| <a class="reference internal" href="../components/boards.html"><span class="doc">Boards Support</span></a>.</p> |
| <p>To port NuttX properly, we have to understand the boot sequence and |
| related kernel configurations. |
| Following links explain them, although these depend on |
| specific kernel version and configurations. |
| (To understand them, we have to read the code deeply.)</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="port_bootsequence.html">The diagram of boot sequence</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="port_relatedkernelconfigrations.html">The list of related kernel configurations</a></li> |
| </ul> |
| </div> |
| <p>About the implementation, the build system tells you minimal implementation of SoC/Board directory, |
| these implementations are almost done by copying and pasting from other SoC/Board |
| directory if there is the source code for the target HW IP in upstream. |
| If there is not the source code in upstream, the porter has to implement it by himself.</p> |
| <section id="porting-procedure"> |
| <h2>Porting procedure<a class="headerlink" href="#porting-procedure" title="Permalink to this heading"></a></h2> |
| <p>At first, you have to read and execute <a class="reference internal" href="../quickstart/install.html"><span class="doc">Installing</span></a> and <a class="reference internal" href="../quickstart/compiling_make.html"><span class="doc">Compiling with Make</span></a>. |
| After that, try following procedure.</p> |
| <table class="docutils align-default"> |
| <tbody> |
| <tr class="row-odd"><td><p>Step</p></td> |
| <td><p>Process</p></td> |
| <td><p>Comment</p></td> |
| </tr> |
| <tr class="row-even"><td><p>1</p></td> |
| <td><p>Add the SoC</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>2</p></td> |
| <td><p>Add the Board</p></td> |
| <td><p>If the board was not sold in the market, |
| the board directory should be located out-of-tree. |
| For details see <a class="reference internal" href="customboards.html"><span class="doc">Custom Boards How-To</span></a>. |
| And if you wanted to add own apps, see <a class="reference internal" href="customapps.html"><span class="doc">Custom Apps How-to</span></a>.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>3</p></td> |
| <td><p>Configure</p></td> |
| <td><p>The configure needs to understand related kernel configurations. |
| see <a class="reference internal" href="port_relatedkernelconfigrations.html"><span class="doc">The list of related kernel configurations</span></a>.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>4</p></td> |
| <td><p>Compile</p></td> |
| <td><p>The compile tells you which source files are needed in SoC/Board |
| directory to pass the compile.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>5</p></td> |
| <td><p>Link</p></td> |
| <td><p>The link tells you which symbols are needed in SoC/Board directory |
| to pass the link.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>6</p></td> |
| <td><p>Implement</p></td> |
| <td><p>Do implement the symbols which are needed by the link.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>7</p></td> |
| <td><p>Verify</p></td> |
| <td><p>Do “apps/testing/ostest”. |
| I think the pass of ostest is the one of proof for proper porting. |
| And check the timer implementation whether the kernel could |
| count the time accurately or not.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </section> |
| <section id="porting-case-studies"> |
| <h2>Porting Case Studies<a class="headerlink" href="#porting-case-studies" title="Permalink to this heading"></a></h2> |
| <p>These porting guides depend on specific kernel versions, as some code structures have changed over time. They will still |
| provide a general idea on how to port.</p> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="porting-case-studies/bcm2711-rpi4b.html">Porting to the BCM2711 (Raspberry Pi 4B)</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="porting-case-studies/port_arm_cm4.html">The case of ARM CM4 & cxd32xx @NuttX12.4.0</a></li> |
| </ul> |
| </div> |
| </section> |
| </section> |
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