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Improve welcome readme file (#1779)
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Igor Pečovnik
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# Armbian #
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<h3 align=center><a href="#armbian-build-tools"><img src=".github/armbian-logo.png" alt="Armbian logo" width="144"></a><br>
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build tools</h3>
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Debian based Linux for ARM based single-board computers
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<p align=right> </p>
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[https://www.armbian.com](https://www.armbian.com "Armbian")
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## Table of contents
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- [What this project does?](#what-this-project-does)
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- [What do you need to get started?](#what-do-you-need-to-get-started)
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- [How to build an image or a kernel?](#how-to-build-an-image-or-a-kernel)
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- [Build parameter examples](#build-parameter-examples)
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- [Compare with industry standards](#compare-with-industry-standards)
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- [Where to download prebuilt images?](#where-to-download-prebuilt-images)
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- [Additional information](#additional-information)
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- [Build tools overview](#build-tools-overview)
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- [Support](#support)
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- [Contribute](#contribute)
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- [Social](#social)
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- [Credits](#credits)
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- [Sponsors](#sponsors)
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# How to build an image or a kernel?
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<p align=right> </p>
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Supported build environment is **Ubuntu Bionic 18.04 x64** ([minimal iso image](http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-amd64/current/images/netboot/mini.iso)).
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## What this project does?
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- guest inside a [VirtualBox](https://www.virtualbox.org/wiki/Downloads) or other virtualization software,
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- guest managed by [Vagrant](https://docs.armbian.com/Developer-Guide_Using-Vagrant/). This uses Virtualbox (as above) but does so in an easily repeatable way,
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- inside a [Docker](https://docs.armbian.com/Developer-Guide_Building-with-Docker/), [systemd-nspawn](https://www.freedesktop.org/software/systemd/man/systemd-nspawn.html) or other container environment [(example)](https://github.com/armbian/build/pull/255#issuecomment-205045273),
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- running natively on a dedicated PC or a server (**not** recommended),
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- **25GB disk space** or more and **2GB RAM** or more available for the VM, container or native OS,
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- superuser rights (configured `sudo` or root access).
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- builds custom Debian based Linux system optimised for [supported single board computers](https://www.armbian.com/download/),
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- covers root filesystem generation, kernel image compilation and bootloader compilation,
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- maintains low-level control software for a [selection of hardware](https://www.armbian.com/download/),
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- provides a consistent user experience by keeping system standards across different SBC platforms.
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**Execution**
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<p align=right> </p>
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## What do you need to get started?
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- x64 machine with at least 2GB of memory and ~30GB of disk space for the VM, container or native OS,
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- Ubuntu Bionic 18.04 / Focal 20.04 x64 for native building or any [Docker](https://docs.armbian.com/Developer-Guide_Building-with-Docker/) capable x64 Linux for containerised,
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- superuser rights (configured sudo or root access).
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## How to build an image or a kernel?
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```text
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apt -y install git
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git clone https://github.com/armbian/build
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cd build
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./compile.sh
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```
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<a href="#how-to-build-an-image-or-a-kernel"><img src=".github/README.gif" alt="Armbian logo" width="100%"></a>
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Make sure that full path to the build script does not contain spaces.
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<p align=right><a href=#table-of-contents>⇧</a></p>
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You will be prompted with a selection menu for a build option, a board name, a kernel branch and an OS release. Please check the documentation for [advanced options](https://docs.armbian.com/Developer-Guide_Build-Options/) and [additional customization](https://docs.armbian.com/Developer-Guide_User-Configurations/).
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## Build parameter examples
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Build process uses caching for the compilation and the debootstrap process, so consecutive runs with similar settings will be much faster.
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Show work in progress areas in interactive mode:
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# How to report issues?
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```text
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./compile.sh EXPERT="yes"
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```
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Please read [this](https://github.com/igorpecovnik/lib/blob/master/.github/ISSUE_TEMPLATE.md) notice first before opening an issue.
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Run build tools inside Docker container:
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# How to contribute?
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```text
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./compile.sh docker
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```
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- [Fork](https://help.github.com/articles/fork-a-repo/) the project
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- Make one or more well commented and clean commits to the repository.
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- Perform a [pull request](https://help.github.com/articles/creating-a-pull-request/) in github's web interface.
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Build minimal CLI Debian buster based image for Odroid XU4. Use modern kernel and write image to the SD card:
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If it is a new feature request, don't start the coding first. Remember to [open an issue](https://guides.github.com/features/issues/) to discuss the new feature.
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```text
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./compile.sh BOARD="odroidxu4" BRANCH="current" RELEASE="buster" CARD_DEVICE="/dev/sda" \
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KERNEL_ONLY="no" KERNEL_CONFIGURE="no" INSTALL_HEADERS="yes" BUILD_DESKTOP="no" BUILD_MINIMAL="yes"
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```
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If you are struggling, check [this detailed step by step guide on contributing](https://www.exchangecore.com/blog/contributing-concrete5-github/).
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[Build parameters, advanced build options, user defined configuration, build with Docker?](#additional-information)
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## Where to get more info?
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<p align=right><a href=#table-of-contents>⇧</a></p>
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- [Documentation](https://docs.armbian.com/Developer-Guide_Build-Preparation/ "Developer resources")
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- [Prebuilt images](https://www.armbian.com/download/ "Download section")
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- [Support forums](https://forum.armbian.com/ "Armbian support forum")
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## Compare with industry standards
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Check similarity, advantages and disadvantages compared with leading industry standard build software.
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Function | Armbian | Yocto | Buildroot |
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|:--|:--|:--|:--|
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| Target | general purpose | embedded | embedded / IOT |
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| U-boot and kernel | compiled from sources | compiled from sources | compiled from sources |
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| Hardware support maintenance | complete | outside | outside |
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| Root file system | Debian or Ubuntu based| custom | custom |
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| Package manager | APT | any | none |
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| Configurability | limited | large | large |
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| Initramfs support | yes | yes | yes |
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| Getting started | quick | very slow | slow |
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| Cross compilation | yes | yes | yes |
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Where to download prebuilt images?
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https://www.armbian.com/download/
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Armbian [releases](https://docs.armbian.com/Release_Changelog/) quarterly at the end of [February, May, August, November](https://github.com/armbian/documentation/blob/master/docs/Process_Release-Model.md). You are welcome to propose changes to our default [images build list](https://github.com/armbian/build/blob/master/config/targets.conf).
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Additional information
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- [Build parameters and advanced build options](https://docs.armbian.com/Developer-Guide_Build-Options/),
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- [Make use of user defined configurations](https://docs.armbian.com/Developer-Guide_User-Configurations/),
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- [Docker](https://docs.armbian.com/Developer-Guide_Building-with-Docker/) and [Vagrant](https://docs.armbian.com/Developer-Guide_Using-Vagrant/) building guides,
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- Engage in [Armbian build framework forums](https://forum.armbian.com/forum/4-development/),
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- Check [Jira project management application](https://armbian.atlassian.net/browse/AR) status,
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- Make use of [central project search engine](https://www.armbian.com/search),
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- Browse [IRC channel logs](http://irc.armbian.com) or interact at #armbian on [freenode](https://freenode.net/).
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Build tools overview
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```text
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├── cache Work / cache directory
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│ ├── rootfs Compressed vanilla Debian and Ubuntu rootfilesystem cache
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│ ├── sources Kernel, u-boot and various drivers sources. Mainly C code
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│ ├── toolchains External cross compilers from Linaro™ or ARM™
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├── config Packages repository configurations
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│ ├── targets.conf Board build target configuration
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│ ├── boards Board configurations
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│ ├── bootenv Initial boot loaders environments per family
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│ ├── bootscripts Initial Boot loaders scripts per family
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│ ├── kernel Kernel build configurations per family
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│ ├── sources Kernel and u-boot sources locations and scripts
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│ ├── templates User configuration templates which populate userpatches
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│ └── torrents External compiler and rootfs cache torrents
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├── lib Main build tools libraries
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├── output Build artifact
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│ └── deb Deb packages
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│ └── images Bootable images - RAW or compressed
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│ └── debug Patch and build logs
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│ └── config Kernel configuration export location
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│ └── patch Created patches location
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├── packages Support scripts, binary blobs, packages
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│ ├── blobs Wallpapers, various configs, closed source bootloaders
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│ ├── bsp Scripts and configs overlay for rootfs
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│ └── extras-buildpkgs Optional compilation and packaging engine
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├── patch Collection of patches
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│ ├── atf ARM trusted firmware
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│ ├── kernel Linux kernel patches
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| | └── family-branch Per kernel family and branch
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│ ├── misc Linux kernel packaging patches
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│ └── u-boot Universal boot loader patches
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| ├── u-boot-board For specific board
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| └── u-boot-family For entire kernel family
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└── userpatches User: configuration patching area
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├── lib.config User: tools common config/override file
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├── config-default.conf User: default user config file
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├── customize-image.sh User: script will execute just before closing the image
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├── atf User: ARM trusted firmware
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├── kernel User: Linux kernel per kernel family
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├── misc User: various
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└── u-boot User: universal boot loader patches
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```
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Support
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- Have you found a bug in the **build tools**?
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Try to recreate it with a clean build tools clone. Then search for [existing and closed issues](https://github.com/armbian/build/issues). If you don't find it there, [open a new issue](https://github.com/armbian/build/issues/new).
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- Do you have troubles **elsewhere**?
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Armbian is free software and provides **best effort help** through [community forums](https://forum.armbian.com/). If you can't find answer there and/or with help of [general project search](https://www.armbian.com/search) engine, consider [hiring an expert](https://www.debian.org/consultants/).
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- Personalized support?
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It is limited to active project supporters and sponsors. The shortest way to become one and receive our attention is a four figure [donation to our non-profit project](https://www.armbian.com/donate).
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Contribute
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- Adding a new feature?
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You are welcome to suggest or contribute directly to the code with a pull request. In case your proposed changes are large, remember to discuss them prior to development.
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- Join development?
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Join regulars on their active missions, start maintaining any part of the code: patches, drivers or scripted applications like [armbian-config](https://github.com/armbian/config), address [community wishes](https://github.com/armbian/build/issues),
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- Help elsewhere?
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Maintain and develop [documentation](https://github.com/armbian/documentation), [CI](https://github.com/armbian/ci-testing-tools), [autotests](https://github.com/armbian/autotests), [seed torrents](https://forum.armbian.com/topic/4198-seed-our-torrents/), help on [forum moderating](https://forum.armbian.com/topic/12631-help-on-forum-moderating/), [project administration](https://forum.armbian.com/forum/39-armbian-project-administration/), [costs](https://www.armbian.com/donate).
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Social
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- [Participate in Armbian forums](https://forum.armbian.com),
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- Chat with fellow users on IRC [#armbian](https://webchat.freenode.net/?channels=armbian) on Freenode,
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- Follow [@armbian on Twitter](https://twitter.com/armbian) or [LinkedIN](https://www.linkedin.com/company/armbian).
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Credits
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- [Current and past contributors](https://github.com/armbian/build/graphs/contributors), our families and friends,
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- [Support staff that keeps forums usable](https://forum.armbian.com/members/2-moderators/),
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- [Individuals that help with their ideas](https://forum.armbian.com/), reports and [donations](https://www.armbian.com/donate).
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<p align=right><a href=#table-of-contents>⇧</a></p>
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## Sponsors
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Most of the project is sponsored with a work done by volunteer collaborators, while some part of the project costs are being covered by the industry. We would not be able to get this far without their help.
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[Do you want to see yourself below?](https://www.armbian.com/#contact)
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<img src="https://www.armbian.com/wp-content/uploads/2018/03/orangepi-logo-150x150.png" alt="Armbian logo" width="144" height="144"><img src="https://www.armbian.com/wp-content/uploads/2018/02/friendlyelec-logo-150x150.png" alt="Armbian logo" width="144" height="144">
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<img src="https://www.armbian.com/wp-content/uploads/2018/03/kspace-150x150.png" width="144" height="144">
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<img src="https://www.armbian.com/wp-content/uploads/2018/02/olimex-logo-150x150.png" width="144" height="144">
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<img src="https://www.armbian.com/wp-content/uploads/2018/03/helios4_logo-150x150.png" width="144" height="144">
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<p align=right><a href=#table-of-contents>⇧</a></p>
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