docs/wiki/asus-grouper-(Google-Nexus-7-2012)/index.html


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<h1>asus grouper (Google Nexus 7 2012)</h1>
<h2>Contributors</h2>
<ul>
<li>antonok</li>
</ul>
<h2>What works</h2>
<ul>
<li>Boot process</li>
<li>Telnet/SSH over USB</li>
<li>Screen</li>
<li>USB keyboard, mouse</li>
<li>Touchscreen</li>
</ul>
<h2>What does not work</h2>
<ul>
<li>weston-keyboard</li>
<li>Wifi + other untested parts</li>
</ul>
<h2>How to enter flash mode</h2>
<ul>
<li>Connect a USB cable</li>
<li>Power the device off</li>
<li>Hold power + volume down</li>
<li><code>fastboot</code> should work when the green android appears on the screen</li>
</ul>
<h2>Notes</h2>
<ul>
<li>I am using the LineageOS kernel found <a href="https://github.com/LineageOS/android_kernel_asus_grouper">here</a></li>
<li>The kernel cannot be compiled on versions of gcc newer than 4.9 without a patch, found <a href="https://lists.yoctoproject.org/pipermail/meta-xilinx/2015-September/001181.html">here</a></li>
<li>I could not get UART debugging through the headphone jack to work - as far as I can tell, the 2012 version of the Nexus 7 does not have this feature.</li>
<li>CONFIG_VT had to be enabled for graphics to work. In menuconfig this is located under Device Drivers -&gt; Character devices -&gt; Virtual terminal.</li>
<li>/sys/class/graphics/fb0/mode is empty on boot, it must have U:800x1280p-0. This uses the same initfs hook as many other devices.</li>
<li>xwayland does not work.</li>
<li>weston with fbdev-backend.so uses pixman-type=3 (PIXMAN_TYPE_ABGR), which now does not require configuration.</li>
<li>The touchscreen input device is named <code>elan-touchscreen</code>.</li>
<li>The wifi chip is the Broadcom 4330.</li>
<li>This device was once officially supported on Ubuntu, so it has a firmware package in the <a href="https://packages.ubuntu.com/trusty/linux-firmware-nexus7">Ubuntu repositories</a>.</li>
</ul>
<h2>Image</h2>
<p><img alt="" src="http://i.imgur.com/P2QlXCR.jpg" /></p>
<p><em>Fun fact: <code>grouper</code> is the first tablet to run pmOS!</em></p>

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