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<section id="logging">
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<span id="id1"></span><h1>Logging<a class="headerlink" href="#logging" title="Permalink to this heading"></a></h1>
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<p>SBL provides logging for debugging purpose. It can be configured at build time
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for verbosity. One can control debug messages in multiple ways by modifying the following PCDs defined in <code class="docutils literal notranslate"><span class="pre">BootloaderCorePkg.yaml</span></code> file:</p>
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<table class="docutils align-default">
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<thead>
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<tr class="row-odd"><th class="head"><p>PCD Name</p></th>
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<th class="head"><p>Description</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td><p>PcdFixedDebugPrintErrorLevel</p></td>
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<td><p>Build time debug message level compiled into the image</p></td>
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</tr>
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<tr class="row-odd"><td><p>PcdDebugPropertyMask</p></td>
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<td><p>Runtime debug message level sent to the console</p></td>
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</tr>
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<tr class="row-even"><td><p>PcdDebugOutputDeviceMask</p></td>
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<td><p>Debug output destinations: serial console or log buffer</p></td>
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</tr>
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</tbody>
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</table>
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<p>Commonly used definitions for these PCDs are listed here.</p>
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<p><code class="docutils literal notranslate"><span class="pre">PcdFixedDebugPrintErrorLevel</span></code> definitions:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1">#define DEBUG_INIT 0x00000001 // Initialization</span>
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<span class="c1">#define DEBUG_WARN 0x00000002 // Warnings</span>
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<span class="c1">#define DEBUG_INFO 0x00000040 // Informational debug messages</span>
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<span class="c1">#define DEBUG_VERBOSE 0x00400000 // Detailed debug messages that may</span>
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<span class="o">//</span> <span class="n">significantly</span> <span class="n">impact</span> <span class="n">boot</span> <span class="n">performance</span>
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<span class="c1">#define DEBUG_ERROR 0x80000000 // Error</span>
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</pre></div>
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</div>
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<p><code class="docutils literal notranslate"><span class="pre">PcdDebugPropertyMask</span></code> definitions:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1">#define DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED 0x01</span>
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<span class="c1">#define DEBUG_PROPERTY_DEBUG_PRINT_ENABLED 0x02</span>
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<span class="c1">#define DEBUG_PROPERTY_DEBUG_CODE_ENABLED 0x04</span>
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<span class="c1">#define DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED 0x08</span>
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<span class="c1">#define DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED 0x10</span>
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<span class="c1">#define DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED 0x20</span>
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</pre></div>
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</div>
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<p><code class="docutils literal notranslate"><span class="pre">PcdDebugOutputDeviceMask</span></code> definitions:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1">#define DEBUG_OUTPUT_DEVICE_LOG_BUFFER BIT0</span>
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<span class="c1">#define DEBUG_OUTPUT_DEVICE_SERIAL_PORT BIT1</span>
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</pre></div>
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</div>
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<p>For more details, see <code class="docutils literal notranslate"><span class="pre">DebugLib.h</span></code> and <code class="docutils literal notranslate"><span class="pre">LoaderPlatformDataGuid.h</span></code>.</p>
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<p>An example of minimum debug output from SBL release build on QEMU emulator:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Intel</span> <span class="n">Slim</span> <span class="n">Bootloader</span>
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<span class="n">SBID</span><span class="p">:</span> <span class="n">SB_QEMU</span>
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<span class="n">ISVN</span><span class="p">:</span> <span class="mi">00001</span>
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<span class="n">IVER</span><span class="p">:</span> <span class="mf">000.00001.11095</span>
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<span class="n">BOOT</span><span class="p">:</span> <span class="n">BP0</span>
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<span class="n">MODE</span><span class="p">:</span> <span class="mi">0</span>
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<span class="n">BoardID</span><span class="p">:</span> <span class="mi">00</span>
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<span class="n">Memory</span> <span class="n">Init</span>
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<span class="n">PCI</span> <span class="n">Enum</span>
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<span class="n">ACPI</span> <span class="n">Init</span>
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<span class="n">MP</span> <span class="n">InitJump</span> <span class="n">to</span> <span class="n">payload</span>
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<span class="n">Payload</span> <span class="n">startup</span>
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</pre></div>
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