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<div class="section" id="reserved-memory-device-tree-nodes">
<h1>reserved-memory device tree nodes<a class="headerlink" href="#reserved-memory-device-tree-nodes" title="Permalink to this headline">ΒΆ</a></h1>
<p>OPAL exposes reserved memory through a top-level reserved-memory node,
containing subnodes that represent each reserved memory region.</p>
<p>This follows the Linux specification for the /reserved-memory node,
described in the kernel source tree, in:</p>
<blockquote>
<div>Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt</div></blockquote>
<p>The top-level /reserved-memory node contains:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1">#size-cells = <2></span>
<span class="c1">#address-cells = <2></span>
</pre></div>
</div>
<p>Addresses and sizes are all 64-bits.</p>
<dl class="docutils">
<dt><code class="docutils literal notranslate"><span class="pre">ranges</span></code></dt>
<dd>the empty ranges node indicates no translation of physical
addresses in the subnodes.</dd>
</dl>
<p>The sub-nodes under the /reserved-memory node contain:</p>
<dl class="docutils">
<dt><code class="docutils literal notranslate"><span class="pre">reg</span> <span class="pre">=</span> <span class="pre"><address</span> <span class="pre">size></span></code></dt>
<dd>the address and size of the reserved memory region. The address
and size values are two cells each, as signified by the top-level
<code class="docutils literal notranslate"><span class="pre">#{address,size}-cells</span></code></dd>
<dt><code class="docutils literal notranslate"><span class="pre">ibm,prd-label</span> <span class="pre">=</span> <span class="pre">"string"</span></code></dt>
<dd>a string token for use by the prd system. Specific ranges may be
used by prd - those will be referenced by this label.</dd>
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