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| <div class="section" id="mynewt-faq-bootloader-and-firmware-upgrade"> |
| <h1>Mynewt FAQ - Bootloader and Firmware Upgrade<a class="headerlink" href="#mynewt-faq-bootloader-and-firmware-upgrade" title="Permalink to this headline">¶</a></h1> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#firmware-upgrade-capability" id="id1">Firmware Upgrade Capability</a></p></li> |
| <li><p><a class="reference internal" href="#bootloader-documentation" id="id2">Bootloader Documentation</a></p></li> |
| <li><p><a class="reference internal" href="#mcuboot-vs-mynewt-bootloader" id="id3">MCUboot vs. Mynewt Bootloader</a></p></li> |
| <li><p><a class="reference internal" href="#boot-serial-vs-bootutil" id="id4"><code class="docutils literal notranslate"><span class="pre">boot_serial</span></code> vs. <code class="docutils literal notranslate"><span class="pre">bootutil</span></code></a></p></li> |
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| <div class="section" id="firmware-upgrade-capability"> |
| <h2><a class="toc-backref" href="#id1">Firmware Upgrade Capability</a><a class="headerlink" href="#firmware-upgrade-capability" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Q</strong>: I wanted to check if the stack provides firmware upgrade capability and if so, is there an example you can |
| provide on how it is being done?</p> |
| <p><strong>A</strong>: The <code class="docutils literal notranslate"><span class="pre">newtmgr</span></code> tool is used to upgrade Mynewt devices. <code class="docutils literal notranslate"><span class="pre">newtmgr</span></code> is a command line tool, but there are |
| other client libraries available. There is some information listed under the “Image Upgrade” header in the |
| <a class="reference internal" href="../os/modules/split/split.html"><span class="doc">Split Image documentation</span></a>.</p> |
| </div> |
| <div class="section" id="bootloader-documentation"> |
| <h2><a class="toc-backref" href="#id2">Bootloader Documentation</a><a class="headerlink" href="#bootloader-documentation" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Q</strong>: Is there any documentation on using the bootloader? It sounds like it has baked-in support for serial loading, |
| but I can’t find any details on serial protocol, or how to do a serial boot load. I assume we set a <code class="docutils literal notranslate"><span class="pre">GPREGRET</span></code> |
| flag that tells the bootloader to expect to be flashed by serial, then it handles the rest. Is that true?</p> |
| <p><strong>A</strong>: The serial bootloader would inspect a GPIO to see whether to wait for image upload commands or not. The protocol |
| is the same newtmgr protocol we use for usual image uploads. For some the state reporting is simplified (omitted), and |
| image upload goes to slot 0 instead of slot 1. The serial bootloading is built into newtmgr. For more information, refer |
| to the documentation on the <a class="reference internal" href="../os/modules/bootloader/bootloader.html"><span class="doc">Mynewt bootloader</span></a>.</p> |
| </div> |
| <div class="section" id="mcuboot-vs-mynewt-bootloader"> |
| <h2><a class="toc-backref" href="#id3">MCUboot vs. Mynewt Bootloader</a><a class="headerlink" href="#mcuboot-vs-mynewt-bootloader" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Q</strong>: Is there any major difference between MCUboot and the Mynewt bootloader?</p> |
| <p><strong>A</strong>: They use different formats. The header is different as well, since you need to pass an extra flag |
| (e.g. -2 to newt for <code class="docutils literal notranslate"><span class="pre">create-image</span></code> for MCUboot). Visit the MCUboot page for more documentation.</p> |
| </div> |
| <div class="section" id="boot-serial-vs-bootutil"> |
| <h2><a class="toc-backref" href="#id4"><code class="docutils literal notranslate"><span class="pre">boot_serial</span></code> vs. <code class="docutils literal notranslate"><span class="pre">bootutil</span></code></a><a class="headerlink" href="#boot-serial-vs-bootutil" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Q</strong>: What is the difference between <code class="docutils literal notranslate"><span class="pre">boot_serial</span></code> and <code class="docutils literal notranslate"><span class="pre">bootutil</span></code>?</p> |
| <p><strong>A</strong>: <code class="docutils literal notranslate"><span class="pre">boot_serial</span></code> is used only for downloading images over the serial port. If you are using newtmgr to upload |
| image over serial, it is handled in <code class="docutils literal notranslate"><span class="pre">boot_serial</span></code>. All other bootloader code is in <code class="docutils literal notranslate"><span class="pre">bootutil</span></code>.</p> |
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