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<h1 id="build-switches">Build Switches<a class="headerlink" href="#build-switches" title="Permanent link">&para;</a></h1>
<p>These parameters are meant to be applied to the <code>./compile.sh</code> command. They are <strong>all</strong> optional. They can also be added to your <a href="../Developer-Guide_Build-Preparation/#providing-build-configuration">build configuration file</a> to save time. Default values are marked <strong>bold</strong> if applicable. </p>
<h3 id="user-space">User space<a class="headerlink" href="#user-space" title="Permanent link">&para;</a></h3>
<p><strong>BOARD</strong> ( <code>string</code> )</p>
<p>Set the name of the board manually to skip the dialog prompt. Name of the board is <a href="https://github.com/armbian/build/tree/main/config/boards">a filename without extension</a>.</p>
<p><strong>BRANCH</strong> ( <code>string</code> )</p>
<ul>
<li><code>vendor</code></li>
<li><code>legacy</code></li>
<li><code>current</code> (recommended)</li>
<li><code>edge</code></li>
</ul>
<p>Set kernel and U-Boot branch manually to skip dialog prompt</p>
<div class="admonition tip">
<p class="admonition-title">Note</p>
<p>Some branches may not be available for all devices.</p>
</div>
<p><strong>RELEASE</strong> ( <code>string</code> )</p>
<ul>
<li><code>bookworm</code></li>
<li><code>trixie</code></li>
<li><code>sid</code></li>
<li><code>jammy</code></li>
<li><code>noble</code></li>
</ul>
<p>Set packages release base manually to skip dialog prompt. Check here for <a href="https://github.com/armbian/build/tree/main/config/distributions">currently available releases</a>.</p>
<div class="admonition tip">
<p class="admonition-title">Note</p>
<p>Only stable and/or LTS upstream Debian or Ubuntu releases are officially supported. Others might work or not.</p>
</div>
<p><strong>BUILD_MINIMAL</strong> ( <code>string</code> )</p>
<ul>
<li><code>yes</code>: build a bare CLI image suitable for application deployment. This option is <strong>not compatible</strong> with <code>BUILD_DESKTOP="yes"</code></li>
<li><code>no</code>: (default)</li>
</ul>
<p><strong>BSPFREEZE</strong> ( <code>string</code> ) </p>
<ul>
<li><code>yes</code>: freeze (from upgrade) armbian firmware packages when building images (U-Boot, kernel, DTB, BSP)</li>
<li><code>no</code>: (default)</li>
</ul>
<p><strong>INSTALL_HEADERS</strong> ( <code>string</code> )</p>
<ul>
<li><code>yes</code>: pre-install kernel headers</li>
<li><code>no</code>: (default)</li>
</ul>
<hr>
<h3 id="networking">Networking<a class="headerlink" href="#networking" title="Permanent link">&para;</a></h3>
<p><strong>NETWORKING_STACK</strong> ( <code>string</code> )</p>
<ul>
<li><code>network-manager</code></li>
<li><code>systemd-networkd</code></li>
<li><code>none</code> (to not-add any networking extensions)</li>
</ul>
<p>Installs desired networking stack. If the parameter is undefined, it sets <code>systemd-networkd</code> for minimal images (MINIMAL=yes) and <code>network-manager</code> for the rest. Time synchronization is also changed; chrony is installed with network-manager, while systemd-timesyncd is used with systemd-networkd. In both cases, we control network settings using <strong>Netplan</strong>.</p>
<div class="admonition example">
<p class="admonition-title">Build switch example</p>
<div class="language-text highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Text Only</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1">1</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a>./compile.sh NETWORKING_STACK=&quot;network-manager&quot;
</span></code></pre></div></td></tr></table></div>
</div>
<hr>
<h3 id="host-environment">Host environment<a class="headerlink" href="#host-environment" title="Permanent link">&para;</a></h3>
<p><strong>EXPERT</strong> </p>
<ul>
<li><code>yes</code></li>
</ul>
<p>Show development features and boards regardless of their support status in interactive mode.</p>
<p><strong>CLEAN_LEVEL</strong> (comma-separated list)</p>
<p>Defines what should be cleaned. Changing this option can be useful when rebuilding images or building more than one image</p>
<ul>
<li><code>make-atf</code> = make clean for ATF, if it is built.</li>
<li><code>make-uboot</code> = make clean for uboot, if it is built.</li>
<li><code>make-kernel</code> = make clean for the kernel if it is built. very slow.<br></li>
<li><code>debs</code>, <code>alldebs</code> = delete all packages in &ldquo;./output/debs&rdquo;</li>
<li><code>images</code> = delete &ldquo;./output/images&rdquo;</li>
<li><code>cache</code> = delete &ldquo;./output/cache&rdquo;</li>
<li><code>sources</code> = delete <code>cache/sources</code> (all downloaded sources)</li>
<li><code>oldcache</code> = remove old cached rootfs except for the newest 8 files</li>
<li><code>extras</code> = delete additional packages for the current release in <code>output/debs/extra</code></li>
</ul>
<p><strong>CARD_DEVICE</strong> ( string )</p>
<ul>
<li><code>/dev/sdX</code> </li>
</ul>
<p>Set to the device of your flash media / SD card. The image will be burned and verified.</p>
<p><strong>PREFER_DOCKER</strong> ( string )</p>
<ul>
<li><code>yes</code> (default)</li>
<li><code>no</code></li>
</ul>
<p>Docker assisted compilation is on by default. Set to <code>no</code> if you prefer running compilation natively.</p>
<p><strong>DOCKER_ARMBIAN_BASE_IMAGE</strong> ( string )</p>
<ul>
<li><code>ubuntu:jammy</code> (default)</li>
<li><code>ubuntu:noble</code></li>
<li><code>debian:bookworm</code></li>
</ul>
<p>Defines the build host when using a Docker container (default). <a href="https://github.com/armbian/docker-armbian-build/pkgs/container/docker-armbian-build">Here</a>, you can see which other options are available.</p>
<ul>
<li><strong>CI</strong> ( string )<ul>
<li>true</li>
<li><strong>false</strong></li>
</ul>
</li>
</ul>
<p>If enabled (<code>true</code>), the Docker build container will receive Docker credentials from the host
(<code>${HOME}/.docker/config.json</code>) and the <code>OCI_TARGET_BASE</code> environment variable.</p>
<ul>
<li><strong>OCI_TARGET_BASE</strong> ( string )<ul>
<li>url/to/container_registry/path</li>
<li><strong>${GHCR_SOURCE}/armbian/*</strong> (GHCR_SOURCE is defined in <code>lib/functions/configuration/main-config.sh</code>)</li>
</ul>
</li>
</ul>
<p>Select the target for pull/push OCI cached images. If not set, default is used.</p>
<ul>
<li><strong>GHCR_MIRROR_ADDRESS</strong> (string)</li>
</ul>
<p>The default mirror address for ghcr.io, set by <code>GHCR_MIRROR=dockerproxy</code>, is ghcr.dockerproxy.com. When this address is unavailable, an alternative address can be set with <code>GHCR_MIRROR_ADDRESS</code>.</p>
<p>Example:
<div class="language-text highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Text Only</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1">1</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1"></a>./compile.sh GHCR_MIRROR=dockerproxy GHCR_MIRROR_ADDRESS=ghcr.libcuda.so
</span></code></pre></div></td></tr></table></div></p>
<ul>
<li><strong>KERNEL_COMPILER</strong> (string)</li>
</ul>
<p>The compiler used to compile the kernel. Usually, this option is set by the board config, but it can be set to <code>clang</code> to use LLVM to compile the kernel.</p>
<p>Example:
<div class="language-text highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Text Only</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-2-1">1</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1"></a>./compile.sh KERNEL_COMPILER=clang
</span></code></pre></div></td></tr></table></div></p>
<ul>
<li><strong>OPENSSHD_REGENERATE_HOST_KEYS</strong> (boolean)
- false (skip armbian-firstrun&rsquo;s OpenSSH host keys deletion and regeneration (eg: to let cloud-init set the SSH host keys)
- <strong>true</strong> (execute armbian-firstrun&rsquo;s OpenSSH host keys deletion + regeneration)</li>
</ul>
<p>Manage OpenSSH host key regeneration at armbian-firstrun service. </p>
<p>Example:
<div class="language-text highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Text Only</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-3-1">1</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1"></a>./compile.sh OPENSSHD_REGENERATE_HOST_KEYS=false
</span></code></pre></div></td></tr></table></div></p>
<hr>
<h3 id="filesystem">Filesystem<a class="headerlink" href="#filesystem" title="Permanent link">&para;</a></h3>
<p><strong>ROOTFS_TYPE</strong> ( string )</p>
<ul>
<li><code>ext4</code> (default)</li>
<li><code>f2fs</code></li>
<li><code>btrfs</code> </li>
<li><code>nilfs2</code></li>
<li><code>xfs</code></li>
<li><code>nfs</code> </li>
</ul>
<p>Create image with different root filesystems instead of default <code>ext4</code>. Requires setting <code>FIXED_IMAGE_SIZE</code> to something smaller than the size of your SD card for <code>F2FS</code></p>
<p><strong>BTRFS_COMPRESSION</strong> ( string )</p>
<ul>
<li><code>lzo</code></li>
<li><code>none</code></li>
<li><code>zlib</code> (default)</li>
<li><code>zstd</code></li>
</ul>
<p>When choosing <code>ROOTFS_TYPE=btrfs</code>, select <code>btrfs</code> filesystem compression method and compression level. By default, the compression is <code>zlib</code>.</p>
<div class="admonition tip">
<p class="admonition-title">Note</p>
<p>The script does not check the legality of the input variable (compression ratio). Input like <code>zlib:1234</code> is legal to the script but illegal to the kernel. Beware that setting this option does affect image creation only (shrinking disk size) and will not adjust <code>/etc/fstab</code>, so it is up to the user to later edit <code>/etc/fstab</code> if compression in daily operation is also wanted (beware of severe performance penalties with random IO patterns and heavy compression algorithms!).</p>
</div>
<p><strong>CRYPTROOT_ENABLE</strong> ( string )</p>
<ul>
<li>yes</li>
<li>no</li>
</ul>
<p>LUKS (Linux Unified Key Setup) is a specification for block device encryption. It establishes an on-disk format for the data, as well as a passphrase/key management policy. LUKS uses the kernel device mapper subsystem via the dm-crypt module.</p>
<div class="language-text highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">When enabled, you need to provide additional information:</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-4-1">1</a></span>
<span class="normal"><a href="#__codelineno-4-2">2</a></span>
<span class="normal"><a href="#__codelineno-4-3">3</a></span>
<span class="normal"><a href="#__codelineno-4-4">4</a></span>
<span class="normal"><a href="#__codelineno-4-5">5</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1"></a>CRYPTROOT_PASSPHRASE=&quot;MYSECRECTPASS&quot; # Mandatory
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2"></a>CRYPTROOT_SSH_UNLOCK=&quot;yes&quot; # Default: yes
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3"></a>CRYPTROOT_SSH_UNLOCK_PORT=&quot;2222&quot; # Default: 2022
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4"></a>CRYPTROOT_MAPPER=armbian-root` # Default: armbian-root
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5"></a>CRYPTROOT_PARAMETERS=&quot;custom cryptsetup options&quot; # Default: --pbkdf pbkdf2
</span></code></pre></div></td></tr></table></div>
<div class="admonition tip">
<p class="admonition-title">Tips and warnings</p>
<ul>
<li>Private key can be placed in <code>$USERPATCHES_PATH/dropbear_authorized_keys</code> or they will be generated in <code>output/images/*.key</code> file</li>
<li>If you want to do the encryption part from scratch, check out <a href="https://forum.armbian.com/topic/15618-full-root-filesystem%C2%A0encryption%C2%A0on-an-armbian-system-new-replaces-2017-tutorial-on-this-topic/">this</a> forum post.</li>
<li>This function might not work well with all distributions.</li>
<li>CRYPTROOT_MAPPER name might affect parallel image building</li>
<li>CRYPTROOT_PARAMETERS may not contain <code>=</code>; separate switches with spaces</li>
</ul>
</div>
<hr>
<h3 id="advanced">Advanced<a class="headerlink" href="#advanced" title="Permanent link">&para;</a></h3>
<p><strong>INCLUDE_HOME_DIR</strong> ( string )</p>
<ul>
<li><code>yes</code></li>
<li><code>no</code> (default)</li>
</ul>
<p>Include directories created inside /home in final image.</p>
<p><strong>ENABLE_EXTENSIONS</strong> (c omma-separated list )</p>
<p><a href="/Developer-Guide_Extensions/">Extensions</a> allows to extend the Armbian build system without overloading the core with specific functionality. Extensions, stored in folder <code>extensions</code> are called</p>
<div class="admonition example">
<p class="admonition-title">Build switch example</p>
<div class="language-text highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">Text Only</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-5-1">1</a></span>
<span class="normal"><a href="#__codelineno-5-2">2</a></span>
<span class="normal"><a href="#__codelineno-5-3">3</a></span>
<span class="normal"><a href="#__codelineno-5-4">4</a></span>
<span class="normal"><a href="#__codelineno-5-5">5</a></span>
<span class="normal"><a href="#__codelineno-5-6">6</a></span>
<span class="normal"><a href="#__codelineno-5-7">7</a></span>
<span class="normal"><a href="#__codelineno-5-8">8</a></span>
<span class="normal"><a href="#__codelineno-5-9">9</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1"></a>./compile.sh \
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2"></a>build \
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3"></a>BOARD=uefi-x86 \
</span><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4"></a>BRANCH=current \
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5"></a>BUILD_DESKTOP=no \
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6"></a>BUILD_MINIMAL=no \
</span><span id="__span-5-7"><a id="__codelineno-5-7" name="__codelineno-5-7"></a>KERNEL_CONFIGURE=no \
</span><span id="__span-5-8"><a id="__codelineno-5-8" name="__codelineno-5-8"></a>RELEASE=noble \
</span><span id="__span-5-9"><a id="__codelineno-5-9" name="__codelineno-5-9"></a>ENABLE_EXTENSIONS=mesa-vpu,nvidia \
</span></code></pre></div></td></tr></table></div>
</div>
<p><strong>CONSOLE_AUTOLOGIN</strong></p>
<ul>
<li><code>yes</code> (default)</li>
<li><code>no</code></li>
</ul>
<p>Automatically login as root for local consoles at first run. Disable if your security threat model requires.</p>
<h1 id="build-options-below-need-to-be-retested-and-added-above-could-be-deprecated">Build options below need to be retested and added above (COULD BE DEPRECATED)<a class="headerlink" href="#build-options-below-need-to-be-retested-and-added-above-could-be-deprecated" title="Permanent link">&para;</a></h1>
<p><img alt="⚠" class="twemoji" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/26a0.svg" title=":warning:" /> DO NOT USE! Obsolete documentation, new documentation above is in progress.</p>
<ul>
<li><strong>KERNEL_KEEP_CONFIG</strong> ( yes | no ):
- yes: use kernel config file from previous compilation for the same branch, device family, and version
- no: use default or user-provided config file </li>
<li><strong>BUILD_DESKTOP</strong> ( yes | no ):
- yes: build an image with a minimal desktop environment
- no: build image with console interface only </li>
<li><strong>CREATE_PATCHES</strong> ( yes | <strong>no</strong> ) <img alt="⚠" class="twemoji" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@15.1.0/assets/svg/26a0.svg" title=":warning:" /> <strong>Warning:</strong> This option is deprecated and may be removed in future releases - use the new <code>kernel-patch</code> / <code>uboot-patch</code> / <code>atf-patch</code> CLI commands instead.
- yes: prompt right before the compilation starts to make changes to the source code for both U-Boot and kernel. From these changes, patch files will be created and placed in the <code>output</code> directory. If you want these patches included in a normal run (without CREATE_PATCHES to say), these files must be copied to the appropriate directories. Also, see <a href="https://docs.armbian.com/Developer-Guide_User-Configurations/#user-provided-patches">user-provided patches</a>.</li>
<li><strong>EXT=rkdevflash</strong> to flash Rockchip images to eMMC either during image build or separately with flash CLI command (<a href="https://github.com/armbian/build/pull/5058">only works bare Linux, not Docker</a>)</li>
</ul>
<h2 id="hidden-options-to-minimize-user-input-for-build-automation">Hidden options to minimize user input for build automation<a class="headerlink" href="#hidden-options-to-minimize-user-input-for-build-automation" title="Permanent link">&para;</a></h2>
<ul>
<li><strong>ARMBIAN_CACHE_ROOTFS_PATH</strong> ( <code>string</code> ): bind mount cache/rootfs to defined folder</li>
<li><strong>ARMBIAN_CACHE_TOOLCHAIN_PATH</strong> ( <code>string</code> ): bind mount cache/toolchain path to defined folder</li>
</ul>
<h2 id="hidden-options-for-advanced-users-default-values-are-marked-bold">Hidden options for advanced users (default values are marked <strong>bold</strong>)<a class="headerlink" href="#hidden-options-for-advanced-users-default-values-are-marked-bold" title="Permanent link">&para;</a></h2>
<ul>
<li><strong>USERPATCHES_PATH</strong> ( <strong>userpatches/</strong> ): set alternate path for the location of the <code>userpatches</code> folder</li>
<li><strong>USE_CCACHE</strong> ( <strong>yes</strong> | no ): use a C compiler cache to speed up the build process</li>
<li><strong>PRIVATE_CCACHE</strong> ( yes | <strong>no</strong> ): use <code>$DEST/ccache</code> as ccache home directory</li>
<li><strong>SKIP_EXTERNAL_TOOLCHAINS</strong> ( yes | <strong>no</strong> ): don&rsquo;t download and use Linaro toolchains, by default placed in cache/toolchain (and configurable with <strong>ARMBIAN_CACHE_TOOLCHAIN_PATH</strong>)</li>
<li><strong>PROGRESS_DISPLAY</strong> ( none | <strong>plain</strong> | dialog ): way to display output of verbose processes - compilation, packaging, debootstrap</li>
<li><strong>PROGRESS_LOG_TO_FILE</strong> ( yes | <strong>no</strong> ): duplicate output, affected by the previous option, to log files <code>output/debug/*.log</code></li>
<li><strong>NO_APT_CACHER</strong> ( <strong>yes</strong> | no ): disable usage of APT cache. Default <code>yes</code> in containers, but can be overridden</li>
<li><strong>DISABLE_IPV6</strong> ( <strong>true</strong> | false ): The distant future, the year Two-Thousand. Set false to allow Aria2c to use a modern ip protocol.</li>
<li><strong>NO_HOST_RELEASE_CHECK</strong> ( yes | <strong>no</strong> ): overrides the check for a supported host system</li>
<li><strong>USE_MAINLINE_GOOGLE_MIRROR</strong> ( yes | <strong>no</strong> ): use the <code>googlesource.com</code> mirror for downloading mainline kernel sources, which may be faster than <code>git.kernel.org</code> depending on your location</li>
<li><strong>USE_GITHUB_UBOOT_MIRROR</strong> ( yes | <strong>no</strong> ): use an unofficial GitHub mirror for downloading mainline U-Boot sources, may be faster than <code>git.denx.de</code> depending on your location</li>
<li><strong>SYNC_CLOCK</strong> ( <strong>yes</strong> | no ): sync system clock on builder before start image creation process</li>
<li><strong>OFFLINE_WORK</strong> ( yes | <strong>no</strong> ): skip downloading and updating sources and time and host check. Set to &ldquo;yes,&rdquo; and you can collect packages without accessing the internet</li>
<li><strong>FORCE_USE_RAMDISK</strong> ( yes | no ): overrides autodetect for using tmpfs in new debootstrap and image creation process</li>
<li><strong>FIXED_IMAGE_SIZE</strong> ( <code>integer</code> ): create an image file of this size (in megabytes) instead of minimal</li>
<li><strong>BOOTSIZE</strong> ( <code>integer</code> <strong>96</strong> ): set size (in megabytes) for separate /boot filesystem. Used if <strong>ROOTFS_TYPE</strong> set to non-ext4</li>
<li><strong>COMPRESS_OUTPUTIMAGE</strong> (comma-separated list): create a compressed archive with an image file and GPG signature for redistribution
- sha: generate SHA256 hash for image
- gpg: sign image using gpg
- 7z: compress image, hash, and signature to 7z archive
- gz: compress image only using gz format
- xz: compress image only using xz format
- yes: compatibility shortcut for <code>sha,gpg,7z</code></li>
<li><strong>IMAGE_XZ_COMPRESSION_RATIO</strong> ( <strong>1</strong> - 9 ) images compression levels when using xz compressor. Beware of memory consumption when going higher</li>
<li><strong>SEVENZIP</strong> ( yes | <strong>no</strong> ): create .7z archive with extreme compression ratio instead of .zip</li>
<li><strong>BUILD_KSRC</strong> ( <strong>yes</strong> | no ): create kernel source packages while building&hellip;</li>
<li><strong>INSTALL_KSRC</strong> ( yes | <strong>no</strong> ): &hellip; and pre-install these kernel sources on the image </li>
<li><strong>FORCE_BOOTSCRIPT_UPDATE</strong> ( yes | no ):
- yes: force bootscript to get updated during bsp package upgrade</li>
<li><strong>NAMESERVER</strong> ( <code>IPv4 address</code> ): the DNS resolver used inside the build chroot. Does not affect the final image. Default: <code>1.0.0.1</code></li>
<li><strong>DOWNLOAD_MIRROR</strong> ( <code>china</code> | <code>bfsu</code> ): select download mirror for <code>toolchain</code> and <code>debian/ubuntu packages</code>
- <code>china</code>: use <code>mirrors.tuna.tsinghua.edu.cn</code>; it will be very fast thanks to Tsinghua University
- <code>bfsu</code>: use <code>mirrors.bfsu.edu.cn</code>, the mirror of Beijing Foreign Studies University<br />
- leave empty to use official source</li>
<li><strong>ARMBIAN_MIRROR</strong> (auto): override automated mirror selection, example &lsquo;ARMBIAN_MIRROR=&rdquo;<a href="https://yourlocalmirror.com">https://yourlocalmirror.com</a>&rdquo;&lsquo;</li>
<li><strong>MAINLINE_MIRROR</strong> ( <code>google</code> | <code>tuna</code> | <code>bfsu</code> ): select mainline mirror of <code>linux-stable.git</code>
- <code>google</code>: use the mirror provided by Google, the same as <code>USE_MAINLINE_GOOGLE_MIRROR=yes</code>
- <code>tuna</code>: use the mirror provided by Tsinghua University
- <code>bfsu</code>: use the mirror provided by Beijing Foreign Studies University, which is similar to <code>tuna</code>
- leave empty to use the official <code>git.kernel.org</code>, which may be very slow for mainland China users</li>
<li><strong>UBOOT_MIRROR</strong> （ <code>github</code> | <code>gitee</code> : select mainline mirror of <code>u-boot.git</code>
- <code>github</code>: use the mirror provided by github, the same as <code>USE_GITHUB_UBOOT_MIRROR=yes</code>
- <code>gitee</code>: use the mirror provided by Gitee, a Chinese git services
- leave empty to use the official <code>source.denx.de</code>, which may be very slow for mainland China users</li>
<li><strong>GITHUB_MIRROR</strong> ( <code>fastgit</code> | <code>gitclone</code> | <code>cnpmjs</code> ): select download mirror for GitHub hosted repository
- <code>fastgit</code>: use the mirror provided by fastgit.org
- <code>gitclone</code>: use the mirror provided by gitclone.com
- <code>cnpmjs</code>: use the mirror provided by cnpmjs.org
- leave empty to connect directly to GitHub, which may be very slow for mainland China users</li>
<li><strong>REGIONAL_MIRROR</strong> ( <code>china</code> ): select mirrors based on regional setting, will not overwrite explicitly specified mirror option
- <code>china</code>: MAINLINE_MIRROR=<code>tuna</code>, UBOOT_MIRROR=<code>gitee</code>, GITHUB_MIRROR=<code>fastgit</code>, DOWNLOAD_MIRROR=<code>china</code>
- leave empty to use default settings</li>
<li><strong>ROOT_FS_CREATE_ONLY</strong> ( yes | <strong>no</strong> ): set to yes to force local cache creation</li>
<li><strong>EXTRAWIFI</strong> ( <strong>yes</strong> | no ): include several drivers for <a href="https://github.com/armbian/build/blob/1914066729b7d0f4ae4463bba2491e3ec37fac84/lib/compilation-prepare.sh#L179-L507">WiFi adapters</a></li>
</ul>
</article>
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