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38<span id="versioning"></span><h1>Version Scheme<a class="headerlink" href="#version-scheme" title="Permalink to this headline"></a></h1>
39<p>Each firmware component has its own versioning scheme, and <cite>op-build</cite> brings
40all of these components together in one image with one global version
41number.</p>
42<p>Firmware versions are exposed to the user through both the device tree
43(<span class="xref std std-ref">device-tree/ibm,firmware-versions</span>) and the VERSION firmware
44partition. As such, firmware versioning numbers <strong>MUST</strong> follow the
45requirements in order for some functionality to be correct.</p>
46<dl class="docutils">
47<dt>skiboot</dt>
48<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>
49<dt>Hostboot</dt>
50<dd>Currently just uses the git SHA1 of the commit</dd>
51<dt>OCC</dt>
52<dd>Currently just uses the git SHA1 of the commit</dd>
53<dt>Petitboot</dt>
54<dd>Uses a X.Y.Z versioning scheme.</dd>
55<dt>Linux</dt>
56<dd>We use the upstream Linux kernel version, and always append <code class="docutils literal notranslate"><span class="pre">-openpowerN</span></code>
57where N is a number starting at 1 that increases for each change we make
58to any additional patches carried in <cite>op-build</cite> for that specific kernel
59version.
60We follow the stable tree and have an “upstream <em>first</em>” policy in place.</dd>
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83<li class="toctree-l1"><a class="reference internal" href="introduction.html">Introduction to OpenPOWER Firmware</a></li>
84<li class="toctree-l1"><a class="reference internal" href="testing.html">Testing op-build</a></li>
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86<li class="toctree-l1"><a class="reference internal" href="boot-devices.html">Supported Boot Devices</a></li>
87<li class="toctree-l1 current"><a class="current reference internal" href="#">Version Scheme</a></li>
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