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  <section id="sysparams">
<span id="device-tree-ibm-opal-sysparams"></span><h1>sysparams<a class="headerlink" href="#sysparams" title="Permalink to this headline">¶</a></h1>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/* System parameter permission */</span><span class="w"></span>
<span class="k">enum</span><span class="w"> </span><span class="n">OpalSysparamPerm</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">     </span><span class="n">OPAL_SYSPARAM_READ</span><span class="w">  </span><span class="o">=</span><span class="w"> </span><span class="mh">0x1</span><span class="p">,</span><span class="w"></span>
<span class="w">     </span><span class="n">OPAL_SYSPARAM_WRITE</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mh">0x2</span><span class="p">,</span><span class="w"></span>
<span class="w">     </span><span class="n">OPAL_SYSPARAM_RW</span><span class="w">    </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">OPAL_SYSPARAM_READ</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">OPAL_SYSPARAM_WRITE</span><span class="p">),</span><span class="w"></span>
<span class="p">};</span><span class="w"></span>
</pre></div>
</div>
<div class="highlight-dts notranslate"><div class="highlight"><pre><span></span><span class="nc">sysparams</span> <span class="p">{</span>
             <span class="nf">compatible</span> <span class="o">=</span> <span class="s">&quot;ibm,opal-sysparams&quot;</span><span class="p">;</span>
             <span class="nf">param-id</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0xf0000001</span> <span class="mh">0xf0000003</span> <span class="mh">0xf0000012</span> <span class="mh">0xf0000016</span> <span class="mh">0xf000001d</span> <span class="mh">0xf0000023</span> <span class="mh">0xf0000024</span> <span class="mh">0xf0000025</span> <span class="mh">0xf0000026</span> <span class="mh">0xf0000027</span><span class="p">&gt;;</span>
             <span class="nf">param-name</span> <span class="o">=</span> <span class="s">&quot;surveillance&quot;, &quot;hmc-management&quot;, &quot;cupd-policy&quot;, &quot;plat-hmc-managed&quot;, &quot;fw-license-policy&quot;, &quot;world-wide-port-num&quot;, &quot;default-boot-device&quot;, &quot;next-boot-device&quot;, &quot;console-select&quot;, &quot;boot-device-path&quot;</span><span class="p">;</span>
             <span class="nf">param-perm</span> <span class="o">=</span> <span class="p">[</span><span class="mo">03</span> <span class="mo">01</span> <span class="mo">03</span> <span class="mo">03</span> <span class="mo">03</span> <span class="mo">02</span> <span class="mo">03</span> <span class="mo">03</span> <span class="mo">03</span> <span class="mo">03</span><span class="p">];</span>
             <span class="nf">phandle</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0x10000032</span><span class="p">&gt;;</span>
             <span class="nf">param-len</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0x4</span> <span class="mh">0x4</span> <span class="mh">0x4</span> <span class="mh">0x4</span> <span class="mh">0x4</span> <span class="mh">0xc</span> <span class="mh">0x1</span> <span class="mh">0x1</span> <span class="mh">0x1</span> <span class="mh">0x30</span><span class="p">&gt;;</span>
             <span class="nf">linux,phandle</span> <span class="o">=</span> <span class="p">&lt;</span><span class="mh">0x10000032</span><span class="p">&gt;;</span>
<span class="p">};</span>
</pre></div>
</div>
<p>Device tree node for system parameters accessible through the
<a class="reference internal" href="../../opal-api/opal-param-89-90.html#opal-sysparams"><span class="std std-ref">Get/Set System Parameters</span></a> calls <a class="reference internal" href="../../opal-api/opal-param-89-90.html#opal-get-param"><span class="std std-ref">OPAL_GET_PARAM</span></a> and <a class="reference internal" href="../../opal-api/opal-param-89-90.html#opal-set-param"><span class="std std-ref">OPAL_SET_PARAM</span></a>.</p>
<p>While many systems and platforms will support parameters and configuration via
either nvram or over IPMI, some platforms may have parameters that need to be
set a different way.</p>
<p>Some parameters may be set Read Only, so the <cite>param-perm</cite> property indicates
permissions.</p>
<p>Currently, this is only something that exists on FSP based systems.</p>
</section>


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