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+  <div class="section" id="op-build-linux-kernel">
+<h1>op-build Linux Kernel<a class="headerlink" href="#op-build-linux-kernel" title="Permalink to this headline">¶</a></h1>
+<p>The skiroot/Petitboot kernel is currently based on the 5.3 series.</p>
+<div class="section" id="submitting-a-patch">
+<h2>Submitting a patch<a class="headerlink" href="#submitting-a-patch" title="Permalink to this headline">¶</a></h2>
+<p>If you require a patch added to the firmware, follow these steps:</p>
+<ol class="arabic simple">
+<li>Submit your patch upstream. It doesn’t need to be upstream, but it
+should be on it’s way</li>
+<li>Send a pull request or a <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">format-patch</span></code> formatted patch series
+to <a class="reference external" href="mailto:openpower-firmware&#37;&#52;&#48;lists&#46;ozlabs&#46;org">openpower-firmware<span>&#64;</span>lists<span>&#46;</span>ozlabs<span>&#46;</span>org</a>, and cc <a class="reference external" href="mailto:joel&#37;&#52;&#48;jms&#46;id&#46;au">joel<span>&#64;</span>jms<span>&#46;</span>id<span>&#46;</span>au</a>. Be
+sure to use <code class="docutils literal notranslate"><span class="pre">--suppress-cc=sob</span></code> when generating the patches so we
+don’t spam the community. The current tree is based on 5.1-stable
+(although we will always move to the latest stable kernel ASAP).</li>
+</ol>
+</div>
+<div class="section" id="bug-fixes">
+<h2>Bug fixes<a class="headerlink" href="#bug-fixes" title="Permalink to this headline">¶</a></h2>
+<p>Whenever a stable release is tagged in
+<a class="reference external" href="https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/">https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/</a>,
+we will rebase our patches on top of that and create a new release.</p>
+<p>If you are submitting patches upstream that you want to be included,
+then ensure you cc stable as per the
+<a class="reference external" href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/Documentation/stable_kernel_rules.txt">rules</a>.</p>
+</div>
+<div class="section" id="versioning">
+<h2>Versioning<a class="headerlink" href="#versioning" title="Permalink to this headline">¶</a></h2>
+<p>Versions are the upstream version number, followed by <code class="docutils literal notranslate"><span class="pre">-openpowerN</span></code>,
+where N is the revision that counts up from 1 for the given upstream
+version number. These versions will be present as tags in the git
+repository hosted at <a class="reference external" href="https://github.com/open-power/linux">https://github.com/open-power/linux</a>.</p>
+<p>We aim to follow “the latest upstream release”.</p>
+<p>For op-build stable trees, we follow the latest stable release of the
+kernel that particular op-build release was made with. Since op-build
+stable releases may outlast how long an upstream kernel is maintain for,
+we will move up the kernel version we use until the next LTS kernel.
+Once on an LTS kernel, an op-build stable release will stick with that
+version.</p>
+</div>
+<div class="section" id="tree-and-patches">
+<h2>Tree and patches<a class="headerlink" href="#tree-and-patches" title="Permalink to this headline">¶</a></h2>
+<p>The kernel tree hosted at <a class="reference external" href="https://github.com/open-power/linux">https://github.com/open-power/linux</a> contains
+the current release plus a set of patches that we carry. Ideally there
+would be no patches carried, as everything should be upstream.</p>
+<p>We take the commits in this tree between the upstream tag and the
+openpower tag and generate a series of patches that are imported into
+the op-build Buildroot overlay, and placed in
+<a class="reference external" href="https://github.com/open-power/op-build/tree/master/openpower/linux">op-build/openpower/linux</a>.
+op-build then fetches the upstream tarball and applies these patches.
+This way we don’t have to clone an entire tree when doing an op-build
+build.</p>
+<p>All patches are to head upstream <em>first</em>. There is a zero chance that
+op-build will carry kernel patches for any time greater than “until the
+next kernel release”, and even then, only in <em>exceptional</em> circumstances.</p>
+</div>
+<div class="section" id="patches-in-the-tree">
+<h2>Patches in the tree<a class="headerlink" href="#patches-in-the-tree" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li>xhci: Reset controller on xhci shutdown</li>
+</ul>
+</div>
+</div>
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