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| <section id="p9-memory-hierarchy"> |
| <h1>P9 memory hierarchy<a class="headerlink" href="#p9-memory-hierarchy" title="Link to this heading">ΒΆ</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@<addr>/mcbist@<mcbist_id>/mcs@<mcs_id>/mca@<mca_id>/dimm@<resource_id></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"><</span><span class="mh">0xc</span><span class="p">>;</span> <span class="cm">/* DRAM Device Type. 0xc = DDR4 */</span> |
| <span class="nf">product-version</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x32</span><span class="p">>;</span> <span class="cm">/* Module Revision Code */</span> |
| <span class="nf">device_type</span> <span class="o">=</span> <span class="s">"memory-dimm-ddr4"</span><span class="p">;</span> |
| <span class="nf">serial-number</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x15d9ad1c</span><span class="p">>;</span> |
| <span class="nf">status</span> <span class="o">=</span> <span class="s">"okay"</span><span class="p">;</span> |
| <span class="nf">size</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x4000</span><span class="p">>;</span> |
| <span class="nf">phandle</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0xd2</span><span class="p">>;</span> |
| <span class="nf">ibm,loc-code</span> <span class="o">=</span> <span class="s">"UOPWR.0000000-Node0-DIMM14"</span><span class="p">;</span> |
| <span class="nf">part-number</span> <span class="o">=</span> <span class="s">"36ASF2G72PZ-2G6B2 "</span><span class="p">;</span> |
| <span class="nf">reg</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0xd00e</span><span class="p">>;</span> |
| <span class="nf">manufacturer-id</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x802c</span><span class="p">>;</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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