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authorYuval Adam <_@yuv.al>2017-08-07 22:05:24 +0300
committerYuval Adam <_@yuv.al>2017-08-07 22:05:24 +0300
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tree64822a223696279b0869417a59a8112a7de5ad66 /docs/wiki/asus-grouper-(Google-Nexus-7-2012)
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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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