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<section id="up2-board">
<span id="id1"></span><h1>UP<sup>2</sup> Board<a class="headerlink" href="#up2-board" title="Permalink to this heading"></a></h1>
<p>The <a href="https://up-board.org/upsquared/specifications/" target="_blank">UP Squared board</a> (UP<sup>2</sup>) is an x86 maker board based on Intel platform Apollo Lake. The UP boards are used in IoT, industrial automation, digital signage areas etc.</p>
<section id="prerequisites">
<h2>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this heading"></a></h2>
<p>SBL supports UP<sup>2</sup> maker board. To start developing SBL, the following equipment, software and environments are required:</p>
<ul class="simple">
<li><p>UP<sup>2</sup> kit (<a href="https://up-shop.org/up-squared-series.html" target="_blank">Model N3350</a>)</p></li>
<li><p>Custom SPI flashing cable (<a href="https://wiki.up-community.org/BIOS_chip_flashing_on_UP_Squared" target="_blank">instructions</a>).</p></li>
<li><p><a href="https://up-shop.org/usb-2-0-pin-header-cable.html" target="_blank">USB 2.0 pin header cable</a> for debug uart output. OR <a class="reference internal" href="#up2-debug-uart-pinout">Make your own</a>.</p></li>
<li><p>DediProg SF100 or SF600 programmer</p></li>
<li><p>Linux host (see <a class="reference internal" href="../getting-started/build-host-setup.html#running-on-linux"><span class="std std-ref">Building on Linux</span></a> for details)</p></li>
<li><p>Internet access</p></li>
</ul>
</section>
<section id="board-setup">
<h2>Board Setup<a class="headerlink" href="#board-setup" title="Permalink to this heading"></a></h2>
<a class="reference internal image-reference" href="../_images/up2_setup.jpg"><img alt="|UP2| Board Setup" class="align-center" src="../_images/up2_setup.jpg" style="width: 600px;" /></a>
</section>
<section id="before-you-start">
<h2>Before You Start<a class="headerlink" href="#before-you-start" title="Permalink to this heading"></a></h2>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>As you plan to reprogram the SPI flash, it’s a good idea to backup the pre-installed BIOS image first.</p>
</div>
<p>Boot the board and enter BIOS setup menu to get familiar with the board features and settings.</p>
<p>UP<sup>2</sup> is pre-installed with Ubuntu Linux. Boot to Ubuntu and confirm the display, USB, network and other peripherals are working.</p>
<p id="up2-debug-uart-pinout">Early boot serial debug console can be reached via UART0 located on CN16 header on the UP<sup>2</sup> board. Make sure you can observe serial output message running the factory BIOS first.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>To make your own UART debug adapter by wiring, refer to CN16 Header Pinout for UART0:</p>
<table class="docutils align-default">
<tbody>
<tr class="row-odd"><td><p>Pin</p></td>
<td><p>Signal</p></td>
</tr>
<tr class="row-even"><td><p>8</p></td>
<td><p>GND</p></td>
</tr>
<tr class="row-odd"><td><p>9</p></td>
<td><p>UART_RX</p></td>
</tr>
<tr class="row-even"><td><p>10</p></td>
<td><p>UART_TX</p></td>
</tr>
</tbody>
</table>
</div>
<p>In order to boot Ubuntu from eMMC using SBL, it is required to copy the kernel image to the boot partition (FAT32 partition) on the eMMC.</p>
<p>Alternatively, you can boot Yocto OS from USB key without any changes.</p>
<p>You may use utilities (e.g. Rufus) to create a bootable USB key from the Yocto OS image downloaded.</p>
</section>
<section id="building">
<h2>Building<a class="headerlink" href="#building" title="Permalink to this heading"></a></h2>
<p>UP<sup>2</sup> board is based on Intel Apollo Lake platform. To build:</p>
<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">apl</span>
</pre></div>
</div>
<p>The output images are generated under <code class="docutils literal notranslate"><span class="pre">Outputs</span></code> directory.</p>
</section>
<section id="stitching">
<h2>Stitching<a class="headerlink" href="#stitching" title="Permalink to this heading"></a></h2>
<p>Stitch SBL images with factory BIOS image using the stitch tool:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="n">Platform</span><span class="o">/</span><span class="n">ApollolakeBoardPkg</span><span class="o">/</span><span class="n">Script</span><span class="o">/</span><span class="n">StitchLoader</span><span class="o">.</span><span class="n">py</span> <span class="o">-</span><span class="n">i</span> <span class="o">&lt;</span><span class="n">BIOS_IMAGE_NAME</span><span class="o">&gt;</span> <span class="o">-</span><span class="n">s</span> <span class="n">Outputs</span><span class="o">/</span><span class="n">apl</span><span class="o">/</span><span class="n">Stitch_Components</span><span class="o">.</span><span class="n">zip</span> <span class="o">-</span><span class="n">o</span> <span class="o">&lt;</span><span class="n">SBL_IFWI_IMAGE_NAME</span><span class="o">&gt;</span> <span class="o">-</span><span class="n">p</span> <span class="mh">0xAA00000E</span>
<span class="o">&lt;</span><span class="n">BIOS_IMAGE</span><span class="o">&gt;</span> <span class="p">:</span> <span class="n">Input</span> <span class="n">file</span><span class="o">.</span> <span class="n">Factory</span> <span class="n">BIOS</span> <span class="n">extracted</span> <span class="kn">from</span> <span class="nn">UP</span> <span class="n">Squared</span> <span class="n">board</span><span class="o">.</span>
<span class="o">&lt;</span><span class="n">SBL_IFWI_IMAGE</span><span class="o">&gt;</span> <span class="p">:</span> <span class="n">Output</span> <span class="n">file</span><span class="o">.</span> <span class="n">New</span> <span class="n">IFWI</span> <span class="n">image</span> <span class="k">with</span> <span class="n">SBL</span> <span class="ow">in</span> <span class="n">BIOS</span> <span class="n">region</span><span class="o">.</span>
<span class="o">-</span><span class="n">p</span> <span class="o">&lt;</span><span class="n">value</span><span class="o">&gt;</span> <span class="p">:</span> <span class="mi">4</span><span class="o">-</span><span class="n">byte</span> <span class="n">platform</span> <span class="n">data</span> <span class="k">for</span> <span class="n">platform</span> <span class="n">ID</span> <span class="ow">and</span> <span class="n">debug</span> <span class="n">UART</span> <span class="n">port</span> <span class="n">index</span><span class="o">.</span>
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>StitchLoader.py script works only if Boot Guard in the base image is not enabled, and the silicon is not fused with Boot Guard enabled.
If Boot Guard is enabled, please use StitchIfwi.py script instead.</p>
</div>
<p>See <a class="reference internal" href="../tools/StitchTool.html#stitch-tool"><span class="std std-ref">Stitch Tool</span></a> on how to stitch the IFWI image with SBL.</p>
</section>
<section id="slimbootloader-binary-for-capsule">
<h2>Slimbootloader binary for capsule<a class="headerlink" href="#slimbootloader-binary-for-capsule" title="Permalink to this heading"></a></h2>
<p>Creating Slimbootloader binary for capsule image requires the following steps:</p>
<p>Build SBL for UP<sup>2</sup>:</p>
<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">apl</span>
</pre></div>
</div>
<p>Run stitching process as described above to create a SBL IFWI binary <code class="docutils literal notranslate"><span class="pre">sbl_up2_ifwi.bin</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="n">Platform</span><span class="o">/</span><span class="n">ApollolakeBoardPkg</span><span class="o">/</span><span class="n">Script</span><span class="o">/</span><span class="n">StitchLoader</span><span class="o">.</span><span class="n">py</span> <span class="o">-</span><span class="n">i</span> <span class="o">&lt;</span><span class="n">BIOS_IMAGE_NAME</span><span class="o">&gt;</span> <span class="o">-</span><span class="n">s</span> <span class="n">Outputs</span><span class="o">/</span><span class="n">apl</span><span class="o">/</span><span class="n">Stitch_Components</span><span class="o">.</span><span class="n">zip</span> <span class="o">-</span><span class="n">o</span> <span class="n">sbl_up2_ifwi</span><span class="o">.</span><span class="n">bin</span> <span class="o">-</span><span class="n">p</span> <span class="mh">0xAA00000E</span>
</pre></div>
</div>
<p>Extract <code class="docutils literal notranslate"><span class="pre">bios.bin</span></code> from SBL IFWI image:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="n">BootloaderCorePkg</span><span class="o">/</span><span class="n">Tools</span><span class="o">/</span><span class="n">IfwiUtility</span><span class="o">.</span><span class="n">py</span> <span class="n">extract</span> <span class="o">-</span><span class="n">i</span> <span class="n">sbl_up2_ifwi</span><span class="o">.</span><span class="n">bin</span> <span class="o">-</span><span class="n">p</span> <span class="n">IFWI</span><span class="o">/</span><span class="n">BIOS</span> <span class="o">-</span><span class="n">o</span> <span class="n">bios</span><span class="o">.</span><span class="n">bin</span>
</pre></div>
</div>
<p>Generate capsule update image <code class="docutils literal notranslate"><span class="pre">FwuImage.bin</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">python</span> <span class="n">BootloaderCorePkg</span><span class="o">/</span><span class="n">Tools</span><span class="o">/</span><span class="n">GenCapsuleFirmware</span><span class="o">.</span><span class="n">py</span> <span class="o">-</span><span class="n">p</span> <span class="n">BIOS</span> <span class="n">bios</span><span class="o">.</span><span class="n">bin</span> <span class="o">-</span><span class="n">k</span> <span class="n">KEY_ID_FIRMWAREUPDATE_RSA2048</span> <span class="o">-</span><span class="n">o</span> <span class="n">FwuImage</span><span class="o">.</span><span class="n">bin</span>
</pre></div>
</div>
</section>
<section id="triggering-firmware-update">
<h2>Triggering Firmware Update<a class="headerlink" href="#triggering-firmware-update" title="Permalink to this heading"></a></h2>
<p>Sample implementation of trigerring firmware update is explained below</p>
<p>SBL for UP<sup>2</sup> uses BIT16 of PMC I/O register (Scratchpad for sharing data between BIOS and PMC Firmware (BIOS_SCRATCHPAD) - Offset 1090h) to trigger firmware update. When BIT16 is set, SBL will set the boot mode to FLASH_UPDATE.</p>
<p>please refer to IsFirmwareUpdate() function called in <code class="docutils literal notranslate"><span class="pre">Platform\ApollolakeBoardPkg\Library\Stage1BBoardInitLib\Stage1BBoardInitLib.c</span></code> to understand how SBL will detect firmware update mode.</p>
</section>
<section id="flashing">
<h2>Flashing<a class="headerlink" href="#flashing" title="Permalink to this heading"></a></h2>
<p>Flash the IFWI image to UP<sup>2</sup> board using a SPI programmer. See <a href="https://wiki.up-community.org/BIOS_chip_flashing_on_UP_Squared" target="_blank">instructions</a>.</p>
</section>
<section id="booting-yocto-linux-from-usb">
<span id="boot-yocto-usb"></span><h2>Booting Yocto Linux from USB<a class="headerlink" href="#booting-yocto-linux-from-usb" title="Permalink to this heading"></a></h2>
<p>You may need to change boot options to boot from USB. See <a class="reference internal" href="../how-tos/change-boot-option.html#change-boot-options"><span class="std std-ref">Change Boot Options</span></a>.</p>
<ol class="arabic simple">
<li><p>Download Apollo Lake platform <a class="reference external" href="http://downloads.yoctoproject.org/releases/yocto/yocto-2.0/machines/leafhill/leafhill-4.0-jethro-2.0.tar.bz2?bsp=leaf_hill">Yocto Linux</a>.</p></li>
<li><p>Create bootable USB key. For example: In Windows, Rufus can be used. In Linux, etcher app can be used.</p></li>
<li><p>Boot the bootable OS image from USB key on the board.</p></li>
</ol>
</section>
<section id="booting-pre-installed-ubuntu-from-emmc">
<span id="boot-ubuntu-emmc"></span><h2>Booting Pre-installed Ubuntu from eMMC<a class="headerlink" href="#booting-pre-installed-ubuntu-from-emmc" title="Permalink to this heading"></a></h2>
<p>Booting Ubuntu from SBL requires a few extra steps because SBL default payload (OsLoader) loads kernel directly from boot partition, compared to UEFI BIOS which relies on GRUB 2 to boot Ubuntu.</p>
<ol class="arabic simple">
<li><p>Boot to Yocto Linux from USB. See <a class="reference internal" href="#boot-yocto-usb"><span class="std std-ref">Booting Yocto Linux from USB</span></a> for more details.</p></li>
<li><p>Copy vmlinuz and initrd file to <code class="docutils literal notranslate"><span class="pre">/media/mmcblk0p1</span></code> directory</p></li>
</ol>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">cp</span> <span class="o">/</span><span class="n">media</span><span class="o">/</span><span class="n">mmcblk0p2</span><span class="o">/</span><span class="n">boot</span><span class="o">/</span><span class="n">vmlinuz</span><span class="o">-</span><span class="mf">4.10.0</span><span class="o">-</span><span class="mi">9</span><span class="o">-</span><span class="n">upboard</span> <span class="o">/</span><span class="n">media</span><span class="o">/</span><span class="n">mmcblk0p1</span><span class="o">/</span><span class="n">vmlinuz</span>
<span class="n">sudo</span> <span class="n">cp</span> <span class="o">/</span><span class="n">media</span><span class="o">/</span><span class="n">mmcblk0p2</span><span class="o">/</span><span class="n">boot</span><span class="o">/</span><span class="n">initrd</span><span class="o">.</span><span class="n">img</span><span class="o">-</span><span class="mf">4.10.0</span><span class="o">-</span><span class="mi">9</span><span class="o">-</span><span class="n">upboard</span> <span class="o">/</span><span class="n">media</span><span class="o">/</span><span class="n">mmcblk0p1</span><span class="o">/</span><span class="n">initrd</span>
</pre></div>
</div>
<ol class="arabic simple" start="3">
<li><p>Create <code class="docutils literal notranslate"><span class="pre">config.cfg</span></code> file containing the following kernel command line and save it <code class="docutils literal notranslate"><span class="pre">/media/mmcblk0p1</span></code> directory</p></li>
</ol>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">BOOT_IMAGE</span><span class="o">=/</span><span class="n">boot</span><span class="o">/</span><span class="n">vmlinuz</span><span class="o">-</span><span class="mf">4.10.0</span><span class="o">-</span><span class="mi">9</span><span class="o">-</span><span class="n">upboard</span> <span class="n">root</span><span class="o">=/</span><span class="n">dev</span><span class="o">/</span><span class="n">mmcblk0p2</span> <span class="n">earlycon</span><span class="o">=</span><span class="n">uart8250</span><span class="p">,</span><span class="n">mmio32</span><span class="p">,</span><span class="mh">0x82531000</span><span class="p">,</span><span class="mi">115200</span><span class="n">n8</span> <span class="o">&lt;</span><span class="n">eof</span><span class="o">&gt;</span>
</pre></div>
</div>
<p><strong>Good Luck!</strong></p>
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