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<section id="skiboot-console-log">
<h1>SkiBoot Console Log<a class="headerlink" href="#skiboot-console-log" title="Permalink to this headline">¶</a></h1>
<p>Skiboot maintains a circular textual log buffer in memory.</p>
<p>It can be accessed using any debugging method that can peek at
memory contents. While the debug_descriptor does hold the location
of the memory console, we’re pretty keen on keeping its location
static.</p>
<p>Events are logged in the following format:
<code class="docutils literal notranslate"><span class="pre">[S.T,L]</span> <span class="pre">message</span></code> where:</p>
<dl class="field-list simple">
<dt class="field-odd">S</dt>
<dd class="field-odd"><p>Seconds, which is the timebase divided by 512,000,000.
<strong>NOTE</strong>: The timebase is reset during boot, so zero is a few dozen
messages into skiboot booting.</p>
</dd>
<dt class="field-even">T</dt>
<dd class="field-even"><p>Remaining Timebase. It is <em>NOT</em> a fraction of a second, but rather
timebase%512000000</p>
</dd>
<dt class="field-odd">L</dt>
<dd class="field-odd"><p>Log level (see below)</p>
</dd>
</dl>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span> <span class="mf">2.223466021</span><span class="p">,</span><span class="mi">5</span><span class="p">]</span> <span class="n">FLASH</span><span class="p">:</span> <span class="n">Found</span> <span class="n">system</span> <span class="n">flash</span><span class="p">:</span> <span class="n">Macronix</span> <span class="n">MXxxL51235F</span> <span class="nb">id</span><span class="p">:</span><span class="mi">0</span>
<span class="p">[</span> <span class="mf">3.494892796</span><span class="p">,</span><span class="mi">7</span><span class="p">]</span> <span class="n">FLASH</span><span class="p">:</span> <span class="n">flash</span> <span class="n">subpartition</span> <span class="n">eyecatcher</span> <span class="n">CAPP</span>
</pre></div>
</div>
<p>You should use the new prlog() call for any log message and set the
log level/priority appropriately.</p>
<p>printf() is mapped to PR_PRINTF and should be phased out and replaced
with prlog() calls.</p>
<p>See timebase.h for full timebase explanation.</p>
<section id="log-levels">
<h2>Log levels<a class="headerlink" href="#log-levels" title="Permalink to this headline">¶</a></h2>
<table class="docutils align-default">
<colgroup>
<col style="width: 60%" />
<col style="width: 40%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Define</p></th>
<th class="head"><p>Value</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>PR_EMERG</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>PR_ALERT</p></td>
<td><p>1</p></td>
</tr>
<tr class="row-even"><td><p>PR_CRIT</p></td>
<td><p>2</p></td>
</tr>
<tr class="row-odd"><td><p>PR_ERR</p></td>
<td><p>3</p></td>
</tr>
<tr class="row-even"><td><p>PR_WARNING</p></td>
<td><p>4</p></td>
</tr>
<tr class="row-odd"><td><p>PR_NOTICE</p></td>
<td><p>5</p></td>
</tr>
<tr class="row-even"><td><p>PR_PRINTF</p></td>
<td><p>PR_NOTICE</p></td>
</tr>
<tr class="row-odd"><td><p>PR_INFO</p></td>
<td><p>6</p></td>
</tr>
<tr class="row-even"><td><p>PR_DEBUG</p></td>
<td><p>7</p></td>
</tr>
<tr class="row-odd"><td><p>PR_TRACE</p></td>
<td><p>8</p></td>
</tr>
<tr class="row-even"><td><p>PR_INSANE</p></td>
<td><p>9</p></td>
</tr>
</tbody>
</table>
<p>The console_log_levels byte in the debug_descriptor controls what
messages are written to any console drivers (e.g. fsp, uart) and
what level is just written to the in memory console (or not at all).</p>
<p>This enables (advanced) users to vary what level of output they want
at runtime in the memory console and through console drivers (fsp/uart)</p>
<p>You can vary two things by poking in the debug descriptor:</p>
<ol class="arabic simple">
<li><p>what log level is printed at all
e.g. only turn on PR_TRACE at specific points during runtime</p></li>
<li><p>what log level goes out the fsp/uart console, defaults to PR_PRINTF</p></li>
</ol>
<p>We use two 4bit numbers (1 byte) for this in debug descriptor (saving
some space, not needlessly wasting space that we may want in future).</p>
<p>The default is 0x75 (7=PR_DEBUG to in memory console, 5=PR_PRINTF to drivers</p>
<p>If you write 0x77 you will get debug info on uart/fsp console as
well as in memory. If you write 0x95 you get PR_INSANE in memory but
still only PR_NOTICE through drivers.</p>
<p>People who write something like 0x1f will get a very quiet boot indeed.</p>
</section>
<section id="debugging">
<h2>Debugging<a class="headerlink" href="#debugging" title="Permalink to this headline">¶</a></h2>
<p>You can change the log level of what goes to the in memory buffer and whta
goes to the driver (i.e. serial port / IPMI Serial over LAN) at boot time
by setting NVRAM variables:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">nvram</span> <span class="o">-</span><span class="n">p</span> <span class="n">ibm</span><span class="p">,</span><span class="n">skiboot</span> <span class="o">--</span><span class="n">update</span><span class="o">-</span><span class="n">config</span> <span class="n">log</span><span class="o">-</span><span class="n">level</span><span class="o">-</span><span class="n">driver</span><span class="o">=</span><span class="mi">7</span>
<span class="n">nvram</span> <span class="o">-</span><span class="n">p</span> <span class="n">ibm</span><span class="p">,</span><span class="n">skiboot</span> <span class="o">--</span><span class="n">update</span><span class="o">-</span><span class="n">config</span> <span class="n">log</span><span class="o">-</span><span class="n">level</span><span class="o">-</span><span class="n">memory</span><span class="o">=</span><span class="mi">7</span>
</pre></div>
</div>
<p>You can also use the named versions of emerg, alert, crit, err,
warning, notice, printf, info, debug, trace or insane. ie.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">nvram</span> <span class="o">-</span><span class="n">p</span> <span class="n">ibm</span><span class="p">,</span><span class="n">skiboot</span> <span class="o">--</span><span class="n">update</span><span class="o">-</span><span class="n">config</span> <span class="n">log</span><span class="o">-</span><span class="n">level</span><span class="o">-</span><span class="n">driver</span><span class="o">=</span><span class="n">insane</span>
</pre></div>
</div>
<p>You an also write to the debug_descriptor to change it at runtime.</p>
</section>
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<li><a class="reference internal" href="#">SkiBoot Console Log</a><ul>
<li><a class="reference internal" href="#log-levels">Log levels</a></li>
<li><a class="reference internal" href="#debugging">Debugging</a></li>
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