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+  <div class="section" id="release-notes-for-openpower-firmware-v2-0-5">
+<h1>Release Notes for OpenPower Firmware v2.0.5<a class="headerlink" href="#release-notes-for-openpower-firmware-v2-0-5" title="Permalink to this headline">¶</a></h1>
+<p>op-build v2.0.5 was released on Thursday July 19th, 2018 and replaces op-build v2.0.4 as the current stable release in the 2.0.x series.</p>
+<p>It is recommended that v2.0.4 be used over any previous v2.0.x version due to the bug fixes contained within.</p>
+<div class="section" id="updated-packages">
+<h2>Updated Packages<a class="headerlink" href="#updated-packages" title="Permalink to this headline">¶</a></h2>
+<table border="1" class="docutils">
+<colgroup>
+<col width="18%" />
+<col width="18%" />
+<col width="18%" />
+<col width="45%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">Package</th>
+<th class="head">Old Version</th>
+<th class="head">New Version</th>
+<th class="head">Platforms</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>skiboot</td>
+<td>v6.0.5</td>
+<td>v6.0.6</td>
+<td>openpower_mambo, firestone, firenze, garrison,
+zaius, p9dsu, palmetto, pseries, vesnin,
+witherspoon, habanero, openpower_p9_mambo, zz,
+barreleye, romulus</td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="section" id="skiboot-changes">
+<h2>Skiboot changes<a class="headerlink" href="#skiboot-changes" title="Permalink to this headline">¶</a></h2>
+<ul>
+<li><p class="first">phb4/CAPI: Reallocate PEC2 DMA-Read engines to improve GPU-Direct bandwidth</p>
+<p>We reallocate additional 16/8 DMA-Read engines allocated to stack0/1
+on PEC2 respectively. This is needed to improve bandwidth available to
+the Mellanox CX5 adapter when trying to read GPU memory (GPU-Direct).</p>
+<p>If kernel cxl driver indicates a request to allocate maximum possible
+DMA read engines when calling enable_capi_mode() and card is attached
+to PEC2/stack0 slot then we assume its a Mellanox CX5 adapter. We then
+allocate additional 16/8 extra DMA read engines to stack0 and stack1
+respectively on PEC2. This is done by populating the
+XPEC_PCI_PRDSTKOVR and XPEC_NEST_READ_STACK_OVERRIDE as suggested by
+the h/w team.</p>
+</li>
+<li><p class="first">phb4: Disable nodal scoped DMA accesses when PB pump mode is enabled</p>
+<p>By default when a PCIe device issues a read request via the PHB it is first
+issued with nodal scope. When accessing GPU memory the NPU does not know at the
+time of response if the requested memory page is off node or not. Therefore
+every read of GPU memory by a PHB is retried with larger scope which introduces
+bandwidth and latency issues.</p>
+<p>On smaller boxes which have pump mode enabled nodal and group scoped reads are
+treated the same and both types of request are broadcast to one chip. Therefore
+we can avoid the retry by disabling nodal scope on the PHB for these boxes. On
+larger boxes nodal (single chip) and group (multiple chip) scoped reads are
+treated differently. Therefore we avoid disabling nodal scope on large boxes
+which have pump mode disabled to avoid all PHB requests being broadcast to
+multiple chips.</p>
+</li>
+<li><p class="first">npu2/hw-procedures: Enable parity and credit overflow checks</p>
+<p>Enable these error checking features by setting the appropriate bits in
+our one-off initialization of each “NTL Misc Config 2” register.</p>
+<p>The exception is NDL RX parity checking, which should be disabled during
+the link training procedures.</p>
+</li>
+</ul>
+</div>
+</div>
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+<h3>Navigation</h3>
+<p class="caption"><span class="caption-text">Contents:</span></p>
+<ul class="current">
+<li class="toctree-l1"><a class="reference internal" href="../introduction.html">Introduction to OpenPOWER Firmware</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../testing.html">Testing op-build</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../process/index.html">Development Process</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../boot-devices.html">Supported Boot Devices</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../versioning.html">Version Scheme</a></li>
+<li class="toctree-l1 current"><a class="reference internal" href="index.html">op-build Release Notes</a><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="index.html#v1-21">v1.21</a></li>
+<li class="toctree-l2"><a class="reference internal" href="index.html#v1-22">v1.22</a></li>
+<li class="toctree-l2 current"><a class="reference internal" href="index.html#v2-0">v2.0</a></li>
+<li class="toctree-l2"><a class="reference internal" href="index.html#v2-1">v2.1</a></li>
+<li class="toctree-l2"><a class="reference internal" href="index.html#v2-2">v2.2</a></li>
+<li class="toctree-l2"><a class="reference internal" href="index.html#v2-3">v2.3</a></li>
+<li class="toctree-l2"><a class="reference internal" href="index.html#v2-4">v2.4</a></li>
+<li class="toctree-l2"><a class="reference internal" href="index.html#v2-5">v2.5</a></li>
+<li class="toctree-l2"><a class="reference internal" href="index.html#v2-6">v2.6</a></li>
+</ul>
+</li>
+</ul>
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+<h3>Related Topics</h3>
+<ul>
+  <li><a href="../index.html">Documentation overview</a><ul>
+  <li><a href="index.html">op-build Release Notes</a><ul>
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+      <li>Next: <a href="v2.0.6.html" title="next chapter">Release Notes for OpenPower Firmware v2.0.6</a></li>
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