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| <li class="toctree-l2 current"><a class="current reference internal" href="#">etc romfs</a><ul> |
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| <li class="toctree-l3"><a class="reference internal" href="#customizing-romfs-image">Customizing ROMFS Image</a></li> |
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| |
| <section id="etc-romfs"> |
| <h1>etc romfs<a class="headerlink" href="#etc-romfs" title="Permalink to this heading"></a></h1> |
| <p>The ROMFS image is the contents of the <code class="docutils literal notranslate"><span class="pre">/etc</span></code> directory, including the start-up script |
| contains any command support by Nuttx, and other customized contents needed.</p> |
| <section id="configuration"> |
| <h2>Configuration<a class="headerlink" href="#configuration" title="Permalink to this heading"></a></h2> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">CONFIG_NSH_ROMFS /* Mount a ROMFS file system at "/etc" and provide a system init script at</span> |
| <span class="go"> "/etc/init.d.rc.sysinit" and a startup script at "etc/init.d/rcS". */</span> |
| <span class="go">CONFIG_ETC_ROMFSMOUNTPT /* The default mountpoint for the ROMFS volume is "/etc", but that can be</span> |
| <span class="go"> changed with this setting. This must be a absolute path beginning with '/'</span> |
| <span class="go"> and enclosed in quotes. */</span> |
| <span class="go">CONFIG_ETC_ROMFSDEVNO /* This is the minor number of the ROMFS block device. The default is '0'</span> |
| <span class="go"> corresponding to "/dev/ram0". */</span> |
| <span class="go">CONFIG_ETC_ROMFSSECTSIZE /* This is the sector size to use with the ROMFS volume. Since the default volume</span> |
| <span class="go"> is very small, this defaults to 64 but should be increased if the ROMFS volume</span> |
| <span class="go"> were to be become large. Any value selected must be a power of 2. */</span> |
| </pre></div> |
| </div> |
| <p>This capability also depends on:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">CONFIG_DISABLE_MOUNTPOINT /* If mount point support is disabled, then you cannot mount any file systems. */</span> |
| <span class="go">CONFIG_FS_ROMFS /* This option enables ROMFS file system support. */</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="start-up-scripts"> |
| <h2>Start up Scripts<a class="headerlink" href="#start-up-scripts" title="Permalink to this heading"></a></h2> |
| <p><strong>Start-Up Script</strong>. The start-up script contains any command support by Nuttx |
| (i.e., that you see when you enter ‘nsh> help’). The implementation that is provided is |
| intended to provide great flexibility for the use of Start-Up files. |
| This paragraph will discuss the general behavior when all of the |
| configuration options are set to the default values.</p> |
| <p>In this default case, enabling <code class="docutils literal notranslate"><span class="pre">CONFIG_ETC_ROMFS</span></code> will cause Nuttx to |
| behave as follows at Nuttx start-up time:</p> |
| <blockquote> |
| <div><ul> |
| <li><p>Nuttx will create a read-only RAM disk (a ROM disk), containing a tiny |
| ROMFS file system containing the following:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>`--init.d/ |
| `-- rcS |
| `-- rc.sysinit |
| </pre></div> |
| </div> |
| <p>Where <code class="docutils literal notranslate"><span class="pre">rcS</span></code> is the start-up script. |
| Where <code class="docutils literal notranslate"><span class="pre">rc.sysinit</span></code> is the system-init script.</p> |
| </li> |
| <li><p>Nuttx will then mount the ROMFS file system at <code class="docutils literal notranslate"><span class="pre">/etc</span></code>, resulting in:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>|--dev/ |
| | `-- ram0 |
| `--etc/ |
| `--init.d/ |
| `-- rcS |
| `-- rc.sysinit |
| </pre></div> |
| </div> |
| </li> |
| <li><p>By default, the contents of <code class="docutils literal notranslate"><span class="pre">rc.sysinit</span></code> script are:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span># Create a RAMDISK and mount it at /tmp |
| |
| mkrd -m 1 -s 512 1024 |
| mkfatfs /dev/ram1 |
| mount -t vfat /dev/ram1 /tmp |
| </pre></div> |
| </div> |
| </li> |
| <li><p>NSH will execute the script at <code class="docutils literal notranslate"><span class="pre">/etc/init.d/rc.sysinit</span></code> at system |
| init (before the first NSH prompt). After execution of the script, |
| the root FS will look like:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>|--dev/ |
| | |-- ram0 |
| | `-- ram1 |
| |--etc/ |
| | `--init.d/ |
| | `-- rcS |
| | `-- rc.sysinit |
| `--tmp/ |
| </pre></div> |
| </div> |
| </li> |
| </ul> |
| </div></blockquote> |
| <p><strong>Example Configurations</strong>. Here are some configurations that have |
| <code class="docutils literal notranslate"><span class="pre">CONFIG_ETC_ROMFS=y</span></code> in the NuttX configuration file. They might |
| provide useful examples:</p> |
| <blockquote> |
| <div><ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/arm/stm32/hymini-stm32v/nsh2</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/arm/dm320/ntosd-dm320/nsh</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/sim/sim/sim/nsh</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/sim/sim/sim/nsh2</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/sim/sim/sim/nx</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/sim/sim/sim/nx11</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/sim/sim/sim/touchscreen</span></code></p></li> |
| </ul> |
| </div></blockquote> |
| <p>In most of these cases, the configuration sets up the <em>default</em> |
| <code class="docutils literal notranslate"><span class="pre">/etc/init.d/rc.sysinit</span></code> and <code class="docutils literal notranslate"><span class="pre">/etc/init.d/rcS</span></code> script. The default |
| script is here: <code class="docutils literal notranslate"><span class="pre">apps/nshlib/rc.sysinit.template</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">apps/nshlib/rcS.template</span></code>. (The funny values in the rc.sysinit.template |
| like <code class="docutils literal notranslate"><span class="pre">XXXMKRDMINORXXX</span></code> get replaced via <code class="docutils literal notranslate"><span class="pre">sed</span></code> at build time). This |
| default configuration creates a ramdisk and mounts it at <code class="docutils literal notranslate"><span class="pre">/tmp</span></code> as |
| discussed above.</p> |
| </section> |
| <section id="customizing-start-up-scripts"> |
| <h2>Customizing Start up Scripts<a class="headerlink" href="#customizing-start-up-scripts" title="Permalink to this heading"></a></h2> |
| <p>In order to modify the start-up behavior, there are three things to study:</p> |
| <blockquote> |
| <div><ol class="arabic"> |
| <li><p><strong>Configuration Options.</strong> The additional <code class="docutils literal notranslate"><span class="pre">CONFIG_ETC_ROMFS</span></code> |
| configuration options discussed with <cite>Configuration</cite></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">tools/mkromfsimg.sh</span></code> <strong>Script</strong>. The script |
| <code class="docutils literal notranslate"><span class="pre">tools/mkromfsimg.sh</span></code> creates <code class="docutils literal notranslate"><span class="pre">etc_romfs.c</span></code>. It is not |
| automatically executed. If you want to change the configuration |
| settings associated with creating and mounting the <code class="docutils literal notranslate"><span class="pre">/tmp</span></code> |
| directory, then it will be necessary to re-generate this header file |
| using the <code class="docutils literal notranslate"><span class="pre">tools/mkromfsimg.sh</span></code> script.</p> |
| <p>The behavior of this script depends upon several things:</p> |
| <ol class="arabic simple"> |
| <li><p>The configuration settings then installed configuration.</p></li> |
| <li><p>The <code class="docutils literal notranslate"><span class="pre">genromfs</span></code> tool(available from |
| <a class="reference external" href="http://romfs.sourceforge.net/">http://romfs.sourceforge.net</a>) |
| or included within the NuttX buildroot toolchain. There is also a |
| snapshot available in the NuttX tools repository |
| <a class="reference external" href="https://bitbucket.org/nuttx/tools/src/master/genromfs-0.5.2.tar.gz">here</a>.</p></li> |
| <li><p>The <code class="docutils literal notranslate"><span class="pre">xxd</span></code> tool that is used to generate the C header files (xxd |
| is a normal part of a complete Linux or Cygwin installation, |
| usually as part of the <code class="docutils literal notranslate"><span class="pre">vi</span></code> package).</p></li> |
| <li><p>The file <code class="docutils literal notranslate"><span class="pre">include/arch/board/rc.sysinit.template</span></code> and |
| the file <code class="docutils literal notranslate"><span class="pre">include/arch/board/rcs.template</span></code></p></li> |
| </ol> |
| </li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">rc.sysinit.template</span></code>. The file <code class="docutils literal notranslate"><span class="pre">apps/nshlib/rc.sysinit.template</span></code> |
| contains the general form of the <code class="docutils literal notranslate"><span class="pre">rc.sysinit</span></code> file; configured values |
| are plugged into this template file to produce the final <code class="docutils literal notranslate"><span class="pre">rc.sysinit</span></code> file.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">rcS.template</span></code>. The file <code class="docutils literal notranslate"><span class="pre">apps/nshlib/rcS.template</span></code> contains the |
| general form of the <code class="docutils literal notranslate"><span class="pre">rcS</span></code> file; configured values are plugged into |
| this template file to produce the final <code class="docutils literal notranslate"><span class="pre">rcS</span></code> file.</p> |
| <p>To generate a custom <code class="docutils literal notranslate"><span class="pre">rc.sysinit</span></code> and <code class="docutils literal notranslate"><span class="pre">rcS</span></code> file a copy of |
| <code class="docutils literal notranslate"><span class="pre">rc.sysinit.template</span></code> and <code class="docutils literal notranslate"><span class="pre">rcS.template</span></code> needs to |
| be placed at <code class="docutils literal notranslate"><span class="pre">tools/</span></code> and changed according to the desired start-up |
| behaviour. Running <code class="docutils literal notranslate"><span class="pre">tools/mkromfsimg.h</span></code> creates <code class="docutils literal notranslate"><span class="pre">etc_romfs.c</span></code> |
| which needs to be copied to <code class="docutils literal notranslate"><span class="pre">arch/board/src</span></code> and compiled in Makefile</p> |
| </li> |
| </ol> |
| </div></blockquote> |
| <p>All of the startup-behavior is contained in <code class="docutils literal notranslate"><span class="pre">rc.sysinit.template</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">rcS.template</span></code>. The role of <code class="docutils literal notranslate"><span class="pre">mkromfsimg.sh</span></code> script is to (1) apply |
| the specific configuration settings to <code class="docutils literal notranslate"><span class="pre">rc.sysinit.template</span></code> to create |
| the final <code class="docutils literal notranslate"><span class="pre">rc.sysinit</span></code>, and <code class="docutils literal notranslate"><span class="pre">rcS.template</span></code> to create the final <code class="docutils literal notranslate"><span class="pre">rcS</span></code>, |
| and (2) to generate the source file <code class="docutils literal notranslate"><span class="pre">etc_romfs.c</span></code> containing the ROMFS file |
| system image. To do this, <code class="docutils literal notranslate"><span class="pre">mkromfsimg.sh</span></code> uses two tools that must be |
| installed in your system:</p> |
| <blockquote> |
| <div><ol class="arabic simple"> |
| <li><p>The <code class="docutils literal notranslate"><span class="pre">genromfs</span></code> tool that is used to generate the ROMFS file system |
| image.</p></li> |
| <li><p>The <code class="docutils literal notranslate"><span class="pre">xxd</span></code> tool that is used to create the C header file.</p></li> |
| </ol> |
| </div></blockquote> |
| </section> |
| <section id="customizing-romfs-image"> |
| <h2>Customizing ROMFS Image<a class="headerlink" href="#customizing-romfs-image" title="Permalink to this heading"></a></h2> |
| <p>The ROMFS image can be generated from the content in the corresponding |
| <code class="docutils literal notranslate"><span class="pre">board/arch/board/board/src/etc</span></code> directory, and added by Makefile.</p> |
| <p><strong>Example Configurations</strong>. Here are some configurations that have |
| <code class="docutils literal notranslate"><span class="pre">CONFIG_ETC_ROMFS=y</span></code> in the NuttX configuration file. They might |
| provide useful examples:</p> |
| <blockquote> |
| <div><ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/risc-v/bl808/ox64/src/etc</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/risc-v/qemu-rv/rv-virt/src/etc</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/risc-v/esp32c3/esp32c3-devkit/src/etc</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/risc-v/k230/canmv230/src/etc</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/risc-v/jh7110/star64/src/etc</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/arm64/rk3399/nanopi_m4/src/etc</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">boards/sim/sim/sim/src/etc</span></code></p></li> |
| </ul> |
| </div></blockquote> |
| </section> |
| </section> |
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