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<li class="breadcrumb-item active">‘virt’ generic virtual platform</li>
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<section id="virt-generic-virtual-platform">
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<h1>‘virt’ generic virtual platform<a class="headerlink" href="#virt-generic-virtual-platform" title="Link to this heading"></a></h1>
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<p>The <code class="docutils literal notranslate"><span class="pre">virt</span></code> board is a platform which does not correspond to any
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real hardware; it is designed for use in virtual machines.
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It is the recommended board type if you simply want to run
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a guest such as Linux and do not care about reproducing the
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idiosyncrasies and limitations of a particular bit of real-world
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hardware.</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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<blockquote>
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<div><ul class="simple">
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<li><p>PCI/PCIe devices</p></li>
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<li><p>8 virtio-mmio transport devices</p></li>
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<li><p>16550A UART</p></li>
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<li><p>Goldfish RTC</p></li>
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<li><p>SiFive Test device for poweroff and reboot</p></li>
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<li><p>SMP (OpenRISC multicore using ompic)</p></li>
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</ul>
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</div></blockquote>
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</section>
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<section id="boot-options">
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<h2>Boot options<a class="headerlink" href="#boot-options" title="Link to this heading"></a></h2>
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<p>The virt machine can be started using the <code class="docutils literal notranslate"><span class="pre">-kernel</span></code> and <code class="docutils literal notranslate"><span class="pre">-initrd</span></code> options
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to load a Linux kernel and optional disk image. For example:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>qemu-system-or1k<span class="w"> </span>-cpu<span class="w"> </span>or1220<span class="w"> </span>-M<span class="w"> </span>or1k-sim<span class="w"> </span>-nographic<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-device<span class="w"> </span>virtio-net-device,netdev<span class="o">=</span>user<span class="w"> </span>-netdev<span class="w"> </span>user,id<span class="o">=</span>user,net<span class="o">=</span><span class="m">10</span>.9.0.1/24,host<span class="o">=</span><span class="m">10</span>.9.0.100<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-device<span class="w"> </span>virtio-blk-device,drive<span class="o">=</span>d0<span class="w"> </span>-drive<span class="w"> </span><span class="nv">file</span><span class="o">=</span>virt.qcow2,id<span class="o">=</span>d0,if<span class="o">=</span>none,format<span class="o">=</span>qcow2<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-kernel<span class="w"> </span>vmlinux<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-initrd<span class="w"> </span>initramfs.cpio.gz<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>-m<span class="w"> </span><span class="m">128</span>
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</pre></div>
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</div>
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<section id="linux-guest-kernel-configuration">
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<h3>Linux guest kernel configuration<a class="headerlink" href="#linux-guest-kernel-configuration" title="Link to this heading"></a></h3>
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<p>The ‘virt_defconfig’ for Linux openrisc kernels includes the right drivers for
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the <code class="docutils literal notranslate"><span class="pre">virt</span></code> machine.</p>
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</section>
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<section id="hardware-configuration-information">
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<h3>Hardware configuration information<a class="headerlink" href="#hardware-configuration-information" title="Link to this heading"></a></h3>
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<p>The <code class="docutils literal notranslate"><span class="pre">virt</span></code> board automatically generates a device tree blob (“dtb”) which it
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passes to the guest. This provides information about the addresses, interrupt
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lines and other configuration of the various devices in the system.</p>
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<p>The location of the DTB will be passed in register <code class="docutils literal notranslate"><span class="pre">r3</span></code> to the guest operating
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system.</p>
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</section>
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