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  <section id="p9-memory-hierarchy">
<h1>P9 memory hierarchy<a class="headerlink" href="#p9-memory-hierarchy" title="Permalink to this headline">¶</a></h1>
<p>P9 Nimbus supports direct attached DDR memory through 4 DDR ports per side
of the processor. Device tree contains memory hierarchy so that one can
traverse from chip to DIMM like below:</p>
<blockquote>
<div><p>xscom&#64;&lt;addr&gt;/mcbist&#64;&lt;mcbist_id&gt;/mcs&#64;&lt;mcs_id&gt;/mca&#64;&lt;mca_id&gt;/dimm&#64;&lt;resource_id&gt;</p>
</div></blockquote>
<p>Example of dimm node:</p>
<div class="highlight-dts notranslate"><div class="highlight"><pre><span></span><span class="nc">dimm</span><span class="nf">@d00e</span> <span class="p">{</span>
        <span class="nf">memory-id</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0xc</span><span class="p">&gt;;</span> <span class="cm">/* DRAM Device Type. 0xc = DDR4 */</span>
        <span class="nf">product-version</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0x32</span><span class="p">&gt;;</span> <span class="cm">/* Module Revision Code */</span>
        <span class="nf">device_type</span> <span class="o">=</span> <span class="s">&quot;memory-dimm-ddr4&quot;</span><span class="p">;</span>
        <span class="nf">serial-number</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0x15d9ad1c</span><span class="p">&gt;;</span>
        <span class="nf">status</span> <span class="o">=</span> <span class="s">&quot;okay&quot;</span><span class="p">;</span>
        <span class="nf">size</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0x4000</span><span class="p">&gt;;</span>
        <span class="nf">phandle</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0xd2</span><span class="p">&gt;;</span>
        <span class="nf">ibm,loc-code</span> <span class="o">=</span> <span class="s">&quot;UOPWR.0000000-Node0-DIMM14&quot;</span><span class="p">;</span>
        <span class="nf">part-number</span> <span class="o">=</span> <span class="s">&quot;36ASF2G72PZ-2G6B2   &quot;</span><span class="p">;</span>
        <span class="nf">reg</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0xd00e</span><span class="p">&gt;;</span>
        <span class="nf">manufacturer-id</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0x802c</span><span class="p">&gt;;</span> <span class="cm">/* Vendor ID, we can get vendor name from this ID */</span>
<span class="p">};</span>
</pre></div>
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