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<li class="breadcrumb-item active">Arm Server Base System Architecture Reference board (<code class="docutils literal notranslate"><span class="pre">sbsa-ref</span></code>)</li>
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<section id="arm-server-base-system-architecture-reference-board-sbsa-ref">
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<h1>Arm Server Base System Architecture Reference board (<code class="docutils literal notranslate"><span class="pre">sbsa-ref</span></code>)<a class="headerlink" href="#arm-server-base-system-architecture-reference-board-sbsa-ref" title="Link to this heading"></a></h1>
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<p>While the <code class="docutils literal notranslate"><span class="pre">virt</span></code> board is a generic board platform that doesn’t match
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any real hardware the <code class="docutils literal notranslate"><span class="pre">sbsa-ref</span></code> board intends to look like real
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hardware. The <a class="reference external" href="https://developer.arm.com/documentation/den0029/latest">Server Base System Architecture</a> defines a
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minimum base line of hardware support and importantly how the firmware
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reports that to any operating system.</p>
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<p>It is intended to be a machine for developing firmware and testing
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standards compliance with operating systems.</p>
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<section id="supported-devices">
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<h2>Supported devices<a class="headerlink" href="#supported-devices" title="Link to this heading"></a></h2>
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<p>The <code class="docutils literal notranslate"><span class="pre">sbsa-ref</span></code> board supports:</p>
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<blockquote>
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<div><ul class="simple">
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<li><p>A configurable number of AArch64 CPUs</p></li>
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<li><p>GIC version 3</p></li>
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<li><p>System bus AHCI controller</p></li>
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<li><p>System bus XHCI controller</p></li>
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<li><p>CDROM and hard disc on AHCI bus</p></li>
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<li><p>E1000E ethernet card on PCIe bus</p></li>
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<li><p>Bochs display adapter on PCIe bus</p></li>
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<li><p>A generic SBSA watchdog device</p></li>
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</ul>
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</div></blockquote>
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</section>
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<section id="board-to-firmware-interface">
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<h2>Board to firmware interface<a class="headerlink" href="#board-to-firmware-interface" title="Link to this heading"></a></h2>
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<p><code class="docutils literal notranslate"><span class="pre">sbsa-ref</span></code> is a static system that reports a very minimal devicetree to the
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firmware for non-discoverable information about system components. This
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includes both internal hardware and parts affected by the qemu command line
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(i.e. CPUs and memory). As a result it must have a firmware specifically built
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to expect a certain hardware layout (as you would in a real machine).</p>
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<section id="devicetree-information">
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<h3>DeviceTree information<a class="headerlink" href="#devicetree-information" title="Link to this heading"></a></h3>
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<p>The devicetree provided by the board model to the firmware is not intended
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to be a complete compliant DT. It currently reports:</p>
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<blockquote>
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<div><ul class="simple">
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<li><p>CPUs</p></li>
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<li><p>memory</p></li>
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<li><p>platform version</p></li>
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<li><p>GIC addresses</p></li>
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</ul>
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</div></blockquote>
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</section>
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<section id="platform-version">
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<h3>Platform version<a class="headerlink" href="#platform-version" title="Link to this heading"></a></h3>
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<p>The platform version is only for informing platform firmware about
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what kind of <code class="docutils literal notranslate"><span class="pre">sbsa-ref</span></code> board it is running on. It is neither
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a QEMU versioned machine type nor a reflection of the level of the
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SBSA/SystemReady SR support provided.</p>
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<p>The <code class="docutils literal notranslate"><span class="pre">machine-version-major</span></code> value is updated when changes breaking
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fw compatibility are introduced. The <code class="docutils literal notranslate"><span class="pre">machine-version-minor</span></code> value
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is updated when features are added that don’t break fw compatibility.</p>
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<p>Platform version changes:</p>
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<dl class="simple">
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<dt>0.0</dt><dd><p>Devicetree holds information about CPUs, memory and platform version.</p>
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</dd>
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<dt>0.1</dt><dd><p>GIC information is present in devicetree.</p>
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</dd>
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<dt>0.2</dt><dd><p>GIC ITS information is present in devicetree.</p>
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</dd>
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<dt>0.3</dt><dd><p>The USB controller is an XHCI device, not EHCI</p>
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</dd>
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</dl>
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</section>
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</section>
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