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  <div class="section" id="power-management">
<h1>Power Management<a class="headerlink" href="#power-management" title="Permalink to this headline">¶</a></h1>
<p>See <a class="reference internal" href="device-tree/ibm,opal/power-mgt.html#power-mgt-devtree"><span class="std std-ref">ibm,opal/power-mgt device tree entries</span></a> for device tree structure describing power management facilities.</p>
<div class="section" id="debugging">
<h2>Debugging<a class="headerlink" href="#debugging" title="Permalink to this headline">¶</a></h2>
<p>There exist a few debug knobs that can be set via nvram settings. These are
<strong>not</strong> ABI and may be changed or removed at <em>any</em> time.</p>
<div class="section" id="disabling-specific-stop-states">
<h3>Disabling specific stop states<a class="headerlink" href="#disabling-specific-stop-states" title="Permalink to this headline">¶</a></h3>
<p>On boot, specific stop states can be disabled via setting a mask. For example,
to disable all but stop 0,1,2, use ~0xE0000000.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">nvram</span> <span class="o">-</span><span class="n">p</span> <span class="n">ibm</span><span class="p">,</span><span class="n">skiboot</span> <span class="o">--</span><span class="n">update</span><span class="o">-</span><span class="n">config</span> <span class="n">opal</span><span class="o">-</span><span class="n">stop</span><span class="o">-</span><span class="n">state</span><span class="o">-</span><span class="n">disable</span><span class="o">-</span><span class="n">mask</span><span class="o">=</span><span class="mh">0x1FFFFFFF</span>
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<li><a class="reference internal" href="#">Power Management</a><ul>
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