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<section id="exercise-feature-customization-boot-order">
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<span id="exercisefeaturecustombootorder"></span><h1>Exercise \- Feature Customization - Boot Order<a class="headerlink" href="#exercise-feature-customization-boot-order" title="Permalink to this heading"></a></h1>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p><strong>In this exercise, we’ll learn how to change boot order from source code.</strong></p>
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</div>
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<p>You can execute SBL with the following steps:</p>
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<ol class="arabic simple">
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<li><p>Check current boot order in QEMU:</p></li>
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</ol>
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<blockquote>
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<div><ul>
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<li><p>Look through the boot log on Command Prompt and locate string <code class="docutils literal notranslate"><span class="pre">Getting</span> <span class="pre">boot</span> <span class="pre">image</span> <span class="pre">from...</span></code> to determine the 1st boot device:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="n">BuildLoader</span><span class="o">.</span><span class="n">py</span> <span class="n">build</span> <span class="n">qemu</span>
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</pre></div>
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</div>
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</li>
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</ul>
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<img alt="Compile completed" class="align-center" src="../_images/ex7-1.jpg" />
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</div></blockquote>
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<ol class="arabic simple" start="2">
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<li><p>Modify board specific library,</p></li>
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</ol>
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<blockquote>
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<div><ul>
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<li><p>in file <code class="docutils literal notranslate"><span class="pre"><sbl_tree>\Platform\QemuBoardPkg\Library\Stage2BoardInitLib\Stage2BoardInitLib.c</span></code></p></li>
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<li><p>In function <code class="docutils literal notranslate"><span class="pre">UpdateOsBootMediumInfo</span> <span class="pre">()</span></code></p></li>
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<li><p>Add following at the end of the function to override the boot order:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">OsBootOptionList</span><span class="o">-></span><span class="n">CurrentBoot</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span>
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</pre></div>
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</div>
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</li>
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</ul>
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<img alt="Compile completed" class="align-center" src="../_images/ex7-2.jpg" />
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</div></blockquote>
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<div class="line-block">
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<div class="line"><br /></div>
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</div>
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<ol class="arabic" start="3">
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<li><p>Rebuild SBL by using the following command:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="n">BuildLoader</span><span class="o">.</span><span class="n">py</span> <span class="n">build</span> <span class="n">qemu</span>
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</pre></div>
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</div>
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</li>
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<li><p>Completion: you will see <code class="docutils literal notranslate"><span class="pre">Done</span> <span class="pre">[qemu]</span></code> on the screen after compile completed</p></li>
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<li><p>Execute SBL on QEMU by using the following command:</p></li>
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</ol>
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<blockquote>
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<div><ul>
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<li><p>Windows:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="s2">"C:\Program Files\qemu\qemu-system-x86_64.exe"</span> <span class="o">-</span><span class="n">m</span> <span class="mi">256</span><span class="n">M</span> <span class="o">-</span><span class="n">machine</span> <span class="n">q35</span> <span class="o">-</span><span class="n">serial</span> <span class="n">stdio</span> <span class="o">-</span><span class="n">pflash</span> <span class="n">Outputs</span>\<span class="n">qemu</span>\<span class="n">SlimBootloader</span><span class="o">.</span><span class="n">bin</span> <span class="o">-</span><span class="n">drive</span> <span class="nb">id</span><span class="o">=</span><span class="n">mydisk</span><span class="p">,</span><span class="k">if</span><span class="o">=</span><span class="n">none</span><span class="p">,</span><span class="n">file</span><span class="o">=..</span>\<span class="n">Misc</span>\<span class="n">QemuImg</span>\<span class="n">QemuSata</span><span class="o">.</span><span class="n">img</span><span class="p">,</span><span class="nb">format</span><span class="o">=</span><span class="n">raw</span> <span class="o">-</span><span class="n">device</span> <span class="n">ide</span><span class="o">-</span><span class="n">hd</span><span class="p">,</span><span class="n">drive</span><span class="o">=</span><span class="n">mydisk</span> <span class="o">-</span><span class="n">boot</span> <span class="n">order</span><span class="o">=</span><span class="n">d</span>
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</pre></div>
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</div>
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</li>
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<li><p>Linux:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span><span class="o">-</span><span class="n">system</span><span class="o">-</span><span class="n">x86_64</span> <span class="o">-</span><span class="n">m</span> <span class="mi">256</span><span class="n">M</span> <span class="o">-</span><span class="n">machine</span> <span class="n">q35</span> <span class="o">-</span><span class="n">serial</span> <span class="n">mon</span><span class="p">:</span><span class="n">stdio</span> <span class="o">-</span><span class="n">nographic</span> <span class="o">-</span><span class="n">pflash</span> <span class="n">Outputs</span><span class="o">/</span><span class="n">qemu</span><span class="o">/</span><span class="n">SlimBootloader</span><span class="o">.</span><span class="n">bin</span> <span class="o">-</span><span class="n">drive</span> <span class="nb">id</span><span class="o">=</span><span class="n">mydisk</span><span class="p">,</span><span class="k">if</span><span class="o">=</span><span class="n">none</span><span class="p">,</span><span class="n">file</span><span class="o">=../</span><span class="n">Misc</span><span class="o">/</span><span class="n">QemuImg</span><span class="o">/</span><span class="n">QemuSata</span><span class="o">.</span><span class="n">img</span><span class="p">,</span><span class="nb">format</span><span class="o">=</span><span class="n">raw</span> <span class="o">-</span><span class="n">device</span> <span class="n">ide</span><span class="o">-</span><span class="n">hd</span><span class="p">,</span><span class="n">drive</span><span class="o">=</span><span class="n">mydisk</span> <span class="o">-</span><span class="n">boot</span> <span class="n">order</span><span class="o">=</span><span class="n">d</span>
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</pre></div>
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</div>
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</li>
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</ul>
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</div></blockquote>
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<ol class="arabic simple" start="6">
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<li><p>Check the console Window to see the difference</p></li>
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</ol>
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<blockquote>
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<div><img alt="Compile completed" class="align-center" src="../_images/ex7-3.jpg" />
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</div></blockquote>
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<div class="admonition tip">
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<p class="admonition-title">Tip</p>
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<p>Board customization can be done through board specific libraries, such as <code class="docutils literal notranslate"><span class="pre"><sbl_tree>\Stage1ABoardInit/Stage1BBoardInit/Stage2BoardInit</span></code></p>
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