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| <section id="reserved-memory-device-tree-nodes"> |
| <h1>reserved-memory device tree nodes<a class="headerlink" href="#reserved-memory-device-tree-nodes" title="Link to this heading">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><p>Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt</p> |
| </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="simple"> |
| <dt><code class="docutils literal notranslate"><span class="pre">ranges</span></code></dt><dd><p>the empty ranges node indicates no translation of physical |
| addresses in the subnodes.</p> |
| </dd> |
| </dl> |
| <p>The sub-nodes under the /reserved-memory node contain:</p> |
| <dl class="simple"> |
| <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><p>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></p> |
| </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><p>a string token for use by the prd system. Specific ranges may be |
| used by prd - those will be referenced by this label.</p> |
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