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 <p>You can create builds for Nexus devices using Android Open Source Project
 (AOSP) builds and the relevant hardware-specific binaries. For available
 Android builds and targeted devices, see
 <a href="/source/build-numbers.html#source-code-tags-and-builds">Source Code,
 Tags, and Builds</a>.</p>

 <p class="note"><strong>Note:</strong> Due to hardware differences, do not use
 Android 4.1.1 on a Nexus 7 originally sold with Android 4.1.2 or later.</p>

 <p>You can also create builds for
 <a href="https://android.googlesource.com/device/linaro/hikey/">HiKey</a>
 Android reference boards, which are designed to help non-Nexus component vendors
 develop and port drivers to Android releases. Using a reference board can ease
 upgrade efforts, reduce time-to-market for new Android devices, lower device
 costs by enabling ODM/OEMs to choose from a wider range of compatible
 components, and increase the speed of innovation among component suppliers.</p>

 <p>Google supports <a href="#960hikey">HiKey960</a> and
 <a href="#620hikey">HiKey</a> certified
 <a href="https://www.96boards.org/products/ce/hikey/">96Boards</a> as Android
 reference boards. AOSP provides kernel source and board support for HiKey so
 developers can easily create and debug new and existing peripheral drivers, do
 kernel development, and perform other tasks with fewer OEM encumbrances.</p>


 <h2 id="960hikey">HiKey960 boards</h2>

 <p>The HiKey960 board is available in a 3GB RAM configuration from LeMaker (via
 <a href="https://www.amazon.com/dp/B071RD3V34">Amazon.com</a>) and from
 <a href=" http://www.lenovator.com/product/132.html">Lenovator<a/>.</a></p>

 <img src="images/hikey960.png" alt="HiKey960 board image" />
 <p class="img-caption"><strong>Figure 2.</strong> HiKey960 board by Lenovator</p>

 <p>Additional resources:</p>
 <ul>
 <li>
 <a href="https://github.com/96boards/documentation/blob/master/ConsumerEdition/HiKey960/HardwareDocs/HiKey960_Schematics.pdf">HiKey960
 schematics</a></li>
 <li>
 <a href="http://www.96boards.org/documentation/ConsumerEdition/HiKey960/HardwareDocs/HardwareUserManual.md/">HiKey960
 user guide</a></li>
 <li>
 <a href="https://github.com/96boards/documentation/wiki/">96boards wiki</a></li>
 </ul>

 <p>Use the following commands to download, build, and run Android on the
 HiKey960 board.</p>

 <h3 id="960userspace">Compiling userspace</h3>
 <ol>
   <li>Download the Android source tree:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">repo init -u <a href="https://android.googlesource.com/platform/manifest">https://android.googlesource.com/platform/manifest</a> -b master</code>
 <code class="devsite-terminal">repo sync -j24</code>
 </pre>
   </li>
   <li>Download and extract binaries into the Android source tree:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">wget https://dl.google.com/dl/android/aosp/arm-hikey960-NOU-7ad3cccc.tgz</code>
 <code class="devsite-terminal">tar xzf arm-hikey960-NOU-7ad3cccc.tgz</code>
 <code class="devsite-terimnal">./extract-arm-hikey960.sh</code>
 </pre>
   </li>
   <li>Build:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">. ./build/envsetup.sh</code>
 <code class="devsite-terminal">lunch hikey960-userdebug</code>
 <code class="devsite-terminal">make -j32</code>
 </pre>
   </li>
 </ol>

 <h3 id="960fastboot">Installing initial images</h3>
 <ol>
   <li>Select fastboot mode turning ON switch 1 and 3 (for details, refer to the
 HiKey960 user guide).</li>
   <li>Power the board.</li>
   <li>Flash initial images:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">cd device/linaro/hikey/installer/hikey960</code>
 <code class="devsite-terminal">./flash-all.sh</code>
 </pre>
   </li>
   <li>Turn OFF switch 3 and power cycle the board.</li>
 </ol>

 <h3 id="960images">Flashing images</h3>
 <ol>
   <li>Enter fastboot mode by turning ON switch 1 and 3.</li>
   <li>Flash images by running the following commands:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">fastboot flash boot out/target/product/hikey960/boot.img</code>
 <code class="devsite-terminal">fastboot flash dts out/target/product/hikey960/dt.img</code>
 <code class="devsite-terminal">fastboot flash system out/target/product/hikey960/system.img</code>
 <code class="devsite-terminal">fastboot flash cache out/target/product/hikey960/cache.img</code>
 <code class="devsite-terminal">fastboot flash userdata out/target/product/hikey960/userdata.img</code>
 </pre>
   </li>
   <li>Turn OFF switch 3 and power cycle the board.</li>
 </ol>

 <h3 id="960kernel">Building the kernel</h3>
 <ol>
   <li>Run the following commands:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">git clone <a href="https://android.googlesource.com/kernel/hikey-linaro">https://android.googlesource.com/kernel/hikey-linaro</a></code>
 <code class="devsite-terminal">cd hikey-linaro</code>
 <code class="devsite-terminal">git checkout -b android-hikey-linaro-4.4 origin/android-hikey-linaro-4.4</code>
 <code class="devsite-terminal">make ARCH=arm64 hikey960_defconfig</code>
 <code class="devsite-terminal">make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j24</code>
 </pre>
   </li>
   <li>Update the kernel in the boot image.
     <ul>
       <li>Copy hi3660-hikey960.dtb (<code>arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dtb</code>) to the hikey-kernel directory as file hi3660-hikey960.dtb.</li>
       <li>Copy the Image file <code>(arch/arm64/boot/Image.gz</code>) to the hikey-kernel directory as file Image.gz-hikey960.</li>
     </ul>
   <li>Make the boot image:
 <pre class="devsite-terminal devsite-click-to-copy">
 make bootimage -j24
 </pre>
   </li>
 </ol>

 <h3 id="960serial">Setting serial number</h3>
 <p>To set random serial number, run:
 <pre class="devsite-terminal devsite-click-to-copy">
 fastboot getvar nve:SN@<var>16_DIGIT_NUMBER</var>
 </pre>
 <p>Bootloader exports the generated serial number to kernel via
 <code>androidboot.serialno=</code>.

 <h3 id="960resolution">Setting monitor resolution</h3>
 <p>Edit the <code>device/linaro/hikey/hikey960/BoardConfig.mk</code> parameter
 <code>BOARD_KERNEL_CMDLINE</code> and configure the <code>video</code> setting.
 Example setting for a 24" monitor is <code>video=HDMI-A-1:1280x800@60</code>.
 </p>

 <h2 id="620hikey">HiKey boards</h2>

 <p>The HiKey board (also known as HiKey620) is available in
 <a href="http://www.lenovator.com/product/86.html">1GB RAM</a> and
 <a href="http://www.lenovator.com/product/90.html">2GB RAM</a> configurations
 from <a href="http://www.lenovator.com">Lenovator</a>:</p>

 <img src="images/hikey620.png" alt="HiKey620 board image" />
 <p class="img-caption"><strong>Figure 1.</strong> HiKey board by Lenovator</p>

 <p>Additional resources:</p>
 <ul>
 <li>
 <a href="https://github.com/96boards/documentation/blob/master/ConsumerEdition/HiKey960/HardwareDocs/HiKey960_Schematics.pdf">HiKey
 schematics</a></li>
 <li>
 <a href="http://www.96boards.org/documentation/ConsumerEdition/HiKey960/HardwareDocs/HardwareUserManual.md/">HiKey
 user guide</a></li>
 <li><a href="https://github.com/96boards/documentation/wiki/">96boards wiki</a></li>
 </ul>

 <p>Use the following commands to download, build, and run Android on the HiKey
 board.</p>

 <h3 id="620userspace">Compiling userspace</h3>
 <ol>
   <li>Download the Android source tree:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">repo init -u <a href="https://android.googlesource.com/platform/manifest">https://android.googlesource.com/platform/manifest</a> -b master</code>
 <code class="devsite-terminal">repo sync -j24</code>
 </pre>
   </li>
   <li>Download and extract HDMI binaries into the Android source tree:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">wget <a href="https://dl.google.com/dl/android/aosp/linaro-hikey-20170523-4b9ebaff.tgz">https://dl.google.com/dl/android/aosp/linaro-hikey-20170523-4b9ebaff.tgz</a></code>
 <code class="devsite-terminal">tar xzf linaro-hikey-20170523-4b9ebaff.tgz</code>
 <code class="devsite-terminal">./extract-linaro-hikey.sh</code>
 </pre>
   </li>
   <li>Install mcopy utility:
 <pre class="devsite-terminal devsite-click-to-copy">
 apt-get install mtools
 </pre>
   </li>
   <li>Build:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">. ./build/envsetup.sh</code>
 <code class="devsite-terminal">lunch hikey-userdebug</code>
 <code class="devsite-terminal">make -j32</code>
 </pre>
   </li>
 </ol>

 <p class="note"><strong>Note:</strong> For 4GB eMMC, instead of <code>$ make -j32</code>
 use: <code>$ make -j32 TARGET_USERDATAIMAGE_4GB=true</code>.</p>

 <h3 id="620fastboot">Installing initial fastboot and ptable</h3>
 <ol>
   <li>Select special bootloader mode by linking J15 1-2 and 3-4 pins (for details,
 refer to the
 <a href="https://www.96boards.org/wp-content/uploads/2015/02/HiKey_User_Guide_Rev0.2.pdf">HiKey
 user guide</a>).</li>
   <li>Connect USB to PC to get ttyUSB device (ex: <code>/dev/ttyUSB1</code>).</li>
   <li>Power the board:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">cd device/linaro/hikey/installer/hikey</code>
 <code class="devsite-terminal">./flash-all.sh /dev/ttyUSB1 [4g]</code>
 </pre>
   </li>
   <li>Remove jumper 3-4 and power the board.</li>
 </ol>

 <h3 id="620images">Flashing images</h3>
 <ol>
   <li>Enter fastboot mode by linking J15 1-2 and 5-6 pins.</li>
   <li>Run the following commands:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">fastboot flash boot out/target/product/hikey/boot.img</code>
 <code class="devsite-terminal">fastboot flash -w system out/target/product/hikey/system.img</code>
 </pre>
   </li>
   <li>Remove jumper 5-6 and power the board.</li>
 </ol>

 <h3 id="620kernel">Building the kernel</h3>
 <ol>
   <li>Run the following commands:
 <pre class="devsite-click-to-copy">
 <code class="devsite-terminal">git clone <a href="https://android.googlesource.com/kernel/hikey-linaro">https://android.googlesource.com/kernel/hikey-linaro</a></code>
 <code class="devsite-terminal">cd hikey-linaro</code>
 <code class="devsite-terminal">git checkout -b android-hikey-linaro-4.9 origin/android-hikey-linaro-4.9</code>
 <code class="devsite-terminal">make ARCH=arm64 hikey_defconfig</code>
 <code class="devsite-terminal">make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j24</code>
 </pre>
   </li>
   <li>Copy output to the hikey kernel directory (<code>/kernel/hikey-linaro</code>):
     <ul>
       <li>Copy hi6220-hikey.dtb (<code>arch/arm64/boot/dts/hisilicon/hi6220-hikey.dtb</code>) to the
 hikey-kernel directory as file hi6220-hikey.dtb-4.9.</li>
   <li>Copy the Image file <code>(arch/arm64/boot/Image-dtb</code>) to the
 hikey-kernel directory as file Image-dtb-4.9.</li>
     </ul>
   <li>Make the boot image:
 <pre class="devsite-terminal devsite-click-to-copy">
 make bootimage -j24
 </pre>
   </li>
 </ol>

 <h3 id="620resolution">Setting monitor resolution</h3>
 <p>Edit <code>device/linaro/hikey/hikey/BoardConfig.mk</code> parameter
 <code>BOARD_KERNEL_CMDLINE</code> and configure the <code>video</code> setting.
 Example setting for a 24" monitor: <code>video=HDMI-A-1:1280x800@60</code>.</p>

 <h3 id="620serial">Configuring kernel serial output (uart3)</h3>
 <p>Set the J2 low speed expansion connector to 1 - Gnd, 11 - Rx, 13 - Tx. For
 details, refer to the
 <a href="https://www.96boards.org/wp-content/uploads/2015/02/HiKey_User_Guide_Rev0.2.pdf">HiKey
 user guide</a>.</p>

   </body>
 </html>
	<html devsite>
	<head>
	<title>Using Reference Boards</title>
	<meta name="project_path" value="/_project.yaml" />
	<meta name="book_path" value="/_book.yaml" />
	</head>
	<body>
	<!--
	Copyright 2017 The Android Open Source Project

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
	-->


	<p>You can create builds for Nexus devices using Android Open Source Project
	(AOSP) builds and the relevant hardware-specific binaries. For available
	Android builds and targeted devices, see
	<a href="/source/build-numbers.html#source-code-tags-and-builds">Source Code,
	Tags, and Builds</a>.</p>

	<p class="note"><strong>Note:</strong> Due to hardware differences, do not use
	Android 4.1.1 on a Nexus 7 originally sold with Android 4.1.2 or later.</p>

	<p>You can also create builds for
	<a href="https://android.googlesource.com/device/linaro/hikey/">HiKey</a>
	Android reference boards, which are designed to help non-Nexus component vendors
	develop and port drivers to Android releases. Using a reference board can ease
	upgrade efforts, reduce time-to-market for new Android devices, lower device
	costs by enabling ODM/OEMs to choose from a wider range of compatible
	components, and increase the speed of innovation among component suppliers.</p>

	<p>Google supports <a href="#960hikey">HiKey960</a> and
	<a href="#620hikey">HiKey</a> certified
	<a href="https://www.96boards.org/products/ce/hikey/">96Boards</a> as Android
	reference boards. AOSP provides kernel source and board support for HiKey so
	developers can easily create and debug new and existing peripheral drivers, do
	kernel development, and perform other tasks with fewer OEM encumbrances.</p>


	<h2 id="960hikey">HiKey960 boards</h2>

	<p>The HiKey960 board is available in a 3GB RAM configuration from LeMaker (via
	<a href="https://www.amazon.com/dp/B071RD3V34">Amazon.com</a>) and from
	<a href=" http://www.lenovator.com/product/132.html">Lenovator<a/>.</a></p>

	<img src="images/hikey960.png" alt="HiKey960 board image" />
	<p class="img-caption"><strong>Figure 2.</strong> HiKey960 board by Lenovator</p>

	<p>Additional resources:</p>
	<ul>
	<li>
	<a href="https://github.com/96boards/documentation/blob/master/ConsumerEdition/HiKey960/HardwareDocs/HiKey960_Schematics.pdf">HiKey960
	schematics</a></li>
	<li>
	<a href="http://www.96boards.org/documentation/ConsumerEdition/HiKey960/HardwareDocs/HardwareUserManual.md/">HiKey960
	user guide</a></li>
	<li>
	<a href="https://github.com/96boards/documentation/wiki/">96boards wiki</a></li>
	</ul>

	<p>Use the following commands to download, build, and run Android on the
	HiKey960 board.</p>

	<h3 id="960userspace">Compiling userspace</h3>
	<ol>
	<li>Download the Android source tree:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">repo init -u <a href="https://android.googlesource.com/platform/manifest">https://android.googlesource.com/platform/manifest</a> -b master</code>
	<code class="devsite-terminal">repo sync -j24</code>
	</pre>
	</li>
	<li>Download and extract binaries into the Android source tree:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">wget https://dl.google.com/dl/android/aosp/arm-hikey960-NOU-7ad3cccc.tgz</code>
	<code class="devsite-terminal">tar xzf arm-hikey960-NOU-7ad3cccc.tgz</code>
	<code class="devsite-terimnal">./extract-arm-hikey960.sh</code>
	</pre>
	</li>
	<li>Build:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">. ./build/envsetup.sh</code>
	<code class="devsite-terminal">lunch hikey960-userdebug</code>
	<code class="devsite-terminal">make -j32</code>
	</pre>
	</li>
	</ol>

	<h3 id="960fastboot">Installing initial images</h3>
	<ol>
	<li>Select fastboot mode turning ON switch 1 and 3 (for details, refer to the
	HiKey960 user guide).</li>
	<li>Power the board.</li>
	<li>Flash initial images:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">cd device/linaro/hikey/installer/hikey960</code>
	<code class="devsite-terminal">./flash-all.sh</code>
	</pre>
	</li>
	<li>Turn OFF switch 3 and power cycle the board.</li>
	</ol>

	<h3 id="960images">Flashing images</h3>
	<ol>
	<li>Enter fastboot mode by turning ON switch 1 and 3.</li>
	<li>Flash images by running the following commands:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">fastboot flash boot out/target/product/hikey960/boot.img</code>
	<code class="devsite-terminal">fastboot flash dts out/target/product/hikey960/dt.img</code>
	<code class="devsite-terminal">fastboot flash system out/target/product/hikey960/system.img</code>
	<code class="devsite-terminal">fastboot flash cache out/target/product/hikey960/cache.img</code>
	<code class="devsite-terminal">fastboot flash userdata out/target/product/hikey960/userdata.img</code>
	</pre>
	</li>
	<li>Turn OFF switch 3 and power cycle the board.</li>
	</ol>

	<h3 id="960kernel">Building the kernel</h3>
	<ol>
	<li>Run the following commands:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">git clone <a href="https://android.googlesource.com/kernel/hikey-linaro">https://android.googlesource.com/kernel/hikey-linaro</a></code>
	<code class="devsite-terminal">cd hikey-linaro</code>
	<code class="devsite-terminal">git checkout -b android-hikey-linaro-4.4 origin/android-hikey-linaro-4.4</code>
	<code class="devsite-terminal">make ARCH=arm64 hikey960_defconfig</code>
	<code class="devsite-terminal">make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j24</code>
	</pre>
	</li>
	<li>Update the kernel in the boot image.
	<ul>
	<li>Copy hi3660-hikey960.dtb (<code>arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dtb</code>) to the hikey-kernel directory as file hi3660-hikey960.dtb.</li>
	<li>Copy the Image file <code>(arch/arm64/boot/Image.gz</code>) to the hikey-kernel directory as file Image.gz-hikey960.</li>
	</ul>
	<li>Make the boot image:
	<pre class="devsite-terminal devsite-click-to-copy">
	make bootimage -j24
	</pre>
	</li>
	</ol>

	<h3 id="960serial">Setting serial number</h3>
	<p>To set random serial number, run:
	<pre class="devsite-terminal devsite-click-to-copy">
	fastboot getvar nve:SN@<var>16_DIGIT_NUMBER</var>
	</pre>
	<p>Bootloader exports the generated serial number to kernel via
	<code>androidboot.serialno=</code>.

	<h3 id="960resolution">Setting monitor resolution</h3>
	<p>Edit the <code>device/linaro/hikey/hikey960/BoardConfig.mk</code> parameter
	<code>BOARD_KERNEL_CMDLINE</code> and configure the <code>video</code> setting.
	Example setting for a 24" monitor is <code>video=HDMI-A-1:1280x800@60</code>.
	</p>

	<h2 id="620hikey">HiKey boards</h2>

	<p>The HiKey board (also known as HiKey620) is available in
	<a href="http://www.lenovator.com/product/86.html">1GB RAM</a> and
	<a href="http://www.lenovator.com/product/90.html">2GB RAM</a> configurations
	from <a href="http://www.lenovator.com">Lenovator</a>:</p>

	<img src="images/hikey620.png" alt="HiKey620 board image" />
	<p class="img-caption"><strong>Figure 1.</strong> HiKey board by Lenovator</p>

	<p>Additional resources:</p>
	<ul>
	<li>
	<a href="https://github.com/96boards/documentation/blob/master/ConsumerEdition/HiKey960/HardwareDocs/HiKey960_Schematics.pdf">HiKey
	schematics</a></li>
	<li>
	<a href="http://www.96boards.org/documentation/ConsumerEdition/HiKey960/HardwareDocs/HardwareUserManual.md/">HiKey
	user guide</a></li>
	<li><a href="https://github.com/96boards/documentation/wiki/">96boards wiki</a></li>
	</ul>

	<p>Use the following commands to download, build, and run Android on the HiKey
	board.</p>

	<h3 id="620userspace">Compiling userspace</h3>
	<ol>
	<li>Download the Android source tree:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">repo init -u <a href="https://android.googlesource.com/platform/manifest">https://android.googlesource.com/platform/manifest</a> -b master</code>
	<code class="devsite-terminal">repo sync -j24</code>
	</pre>
	</li>
	<li>Download and extract HDMI binaries into the Android source tree:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">wget <a href="https://dl.google.com/dl/android/aosp/linaro-hikey-20170523-4b9ebaff.tgz">https://dl.google.com/dl/android/aosp/linaro-hikey-20170523-4b9ebaff.tgz</a></code>
	<code class="devsite-terminal">tar xzf linaro-hikey-20170523-4b9ebaff.tgz</code>
	<code class="devsite-terminal">./extract-linaro-hikey.sh</code>
	</pre>
	</li>
	<li>Install mcopy utility:
	<pre class="devsite-terminal devsite-click-to-copy">
	apt-get install mtools
	</pre>
	</li>
	<li>Build:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">. ./build/envsetup.sh</code>
	<code class="devsite-terminal">lunch hikey-userdebug</code>
	<code class="devsite-terminal">make -j32</code>
	</pre>
	</li>
	</ol>

	<p class="note"><strong>Note:</strong> For 4GB eMMC, instead of <code>$ make -j32</code>
	use: <code>$ make -j32 TARGET_USERDATAIMAGE_4GB=true</code>.</p>

	<h3 id="620fastboot">Installing initial fastboot and ptable</h3>
	<ol>
	<li>Select special bootloader mode by linking J15 1-2 and 3-4 pins (for details,
	refer to the
	<a href="https://www.96boards.org/wp-content/uploads/2015/02/HiKey_User_Guide_Rev0.2.pdf">HiKey
	user guide</a>).</li>
	<li>Connect USB to PC to get ttyUSB device (ex: <code>/dev/ttyUSB1</code>).</li>
	<li>Power the board:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">cd device/linaro/hikey/installer/hikey</code>
	<code class="devsite-terminal">./flash-all.sh /dev/ttyUSB1 [4g]</code>
	</pre>
	</li>
	<li>Remove jumper 3-4 and power the board.</li>
	</ol>

	<h3 id="620images">Flashing images</h3>
	<ol>
	<li>Enter fastboot mode by linking J15 1-2 and 5-6 pins.</li>
	<li>Run the following commands:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">fastboot flash boot out/target/product/hikey/boot.img</code>
	<code class="devsite-terminal">fastboot flash -w system out/target/product/hikey/system.img</code>
	</pre>
	</li>
	<li>Remove jumper 5-6 and power the board.</li>
	</ol>

	<h3 id="620kernel">Building the kernel</h3>
	<ol>
	<li>Run the following commands:
	<pre class="devsite-click-to-copy">
	<code class="devsite-terminal">git clone <a href="https://android.googlesource.com/kernel/hikey-linaro">https://android.googlesource.com/kernel/hikey-linaro</a></code>
	<code class="devsite-terminal">cd hikey-linaro</code>
	<code class="devsite-terminal">git checkout -b android-hikey-linaro-4.9 origin/android-hikey-linaro-4.9</code>
	<code class="devsite-terminal">make ARCH=arm64 hikey_defconfig</code>
	<code class="devsite-terminal">make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j24</code>
	</pre>
	</li>
	<li>Copy output to the hikey kernel directory (<code>/kernel/hikey-linaro</code>):
	<ul>
	<li>Copy hi6220-hikey.dtb (<code>arch/arm64/boot/dts/hisilicon/hi6220-hikey.dtb</code>) to the
	hikey-kernel directory as file hi6220-hikey.dtb-4.9.</li>
	<li>Copy the Image file <code>(arch/arm64/boot/Image-dtb</code>) to the
	hikey-kernel directory as file Image-dtb-4.9.</li>
	</ul>
	<li>Make the boot image:
	<pre class="devsite-terminal devsite-click-to-copy">
	make bootimage -j24
	</pre>
	</li>
	</ol>

	<h3 id="620resolution">Setting monitor resolution</h3>
	<p>Edit <code>device/linaro/hikey/hikey/BoardConfig.mk</code> parameter
	<code>BOARD_KERNEL_CMDLINE</code> and configure the <code>video</code> setting.
	Example setting for a 24" monitor: <code>video=HDMI-A-1:1280x800@60</code>.</p>

	<h3 id="620serial">Configuring kernel serial output (uart3)</h3>
	<p>Set the J2 low speed expansion connector to 1 - Gnd, 11 - Rx, 13 - Tx. For
	details, refer to the
	<a href="https://www.96boards.org/wp-content/uploads/2015/02/HiKey_User_Guide_Rev0.2.pdf">HiKey
	user guide</a>.</p>

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