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<title>Version Scheme &#8212; OpenPOWER Firmware v2.6-257-g5b5624c2
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<div class="section" id="version-scheme">
<span id="versioning"></span><h1>Version Scheme<a class="headerlink" href="#version-scheme" title="Permalink to this headline"></a></h1>
<p>Each firmware component has its own versioning scheme, and <cite>op-build</cite> brings
all of these components together in one image with one global version
number.</p>
<p>Firmware versions are exposed to the user through both the device tree
(<span class="xref std std-ref">device-tree/ibm,firmware-versions</span>) and the VERSION firmware
partition. As such, firmware versioning numbers <strong>MUST</strong> follow the
requirements in order for some functionality to be correct.</p>
<dl class="docutils">
<dt>skiboot</dt>
<dd><a class="reference external" href="https://open-power.github.io/skiboot/doc/process/versioning.html#versioning" title="(in skiboot vv6.7-45-g4b9ca02)"><span>Versioning Scheme of skiboot</span></a></dd>
<dt>Hostboot</dt>
<dd>Currently just uses the git SHA1 of the commit</dd>
<dt>OCC</dt>
<dd>Currently just uses the git SHA1 of the commit</dd>
<dt>Petitboot</dt>
<dd>Uses a X.Y.Z versioning scheme.</dd>
<dt>Linux</dt>
<dd>We use the upstream Linux kernel version, and always append <code class="docutils literal notranslate"><span class="pre">-openpowerN</span></code>
where N is a number starting at 1 that increases for each change we make
to any additional patches carried in <cite>op-build</cite> for that specific kernel
version.
We follow the stable tree and have an “upstream <em>first</em>” policy in place.</dd>
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<li class="toctree-l1"><a class="reference internal" href="introduction.html">Introduction to OpenPOWER Firmware</a></li>
<li class="toctree-l1"><a class="reference internal" href="testing.html">Testing op-build</a></li>
<li class="toctree-l1"><a class="reference internal" href="process/index.html">Development Process</a></li>
<li class="toctree-l1"><a class="reference internal" href="boot-devices.html">Supported Boot Devices</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Version Scheme</a></li>
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