Improve welcome readme file (#1779)

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# Armbian #
<h3 align=center><a href="#armbian-build-tools"><img src=".github/armbian-logo.png" alt="Armbian logo" width="144"></a><br>
build tools</h3>
Debian based Linux for ARM based single-board computers
[https://www.armbian.com](https://www.armbian.com "Armbian")
<p align=right>&nbsp;</p>
## Table of contents
- [What this project does?](#what-this-project-does)
- [What do you need to get started?](#what-do-you-need-to-get-started)
- [How to build an image or a kernel?](#how-to-build-an-image-or-a-kernel)
- [Build parameter examples](#build-parameter-examples)
- [Compare with industry standards](#compare-with-industry-standards)
- [Where to download prebuilt images?](#where-to-download-prebuilt-images)
- [Additional information](#additional-information)
- [Build tools overview](#build-tools-overview)
- [Support](#support)
- [Contribute](#contribute)
- [Social](#social)
- [Credits](#credits)
- [Sponsors](#sponsors)
<p align=right>&nbsp;</p>
## What this project does?
- builds custom Debian based Linux system optimised for [supported single board computers](https://www.armbian.com/download/),
- covers root filesystem generation, kernel image compilation and bootloader compilation,
- maintains low-level control software for a [selection of hardware](https://www.armbian.com/download/),
- provides a consistent user experience by keeping system standards across different SBC platforms.
<p align=right>&nbsp;</p>
## What do you need to get started?
- x64 machine with at least 2GB of memory and ~30GB of disk space for the VM, container or native OS,
- 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,
- superuser rights (configured sudo or root access).
<p align=right><a href=#table-of-contents>⇧</a></p>
## How to build an image or a kernel?
```text
apt -y install git
git clone https://github.com/armbian/build
cd build
./compile.sh
```
<a href="#how-to-build-an-image-or-a-kernel"><img src=".github/README.gif" alt="Armbian logo" width="100%"></a>
<p align=right><a href=#table-of-contents>⇧</a></p>
## Build parameter examples
Show work in progress areas in interactive mode:
```text
./compile.sh EXPERT="yes"
```
Run build tools inside Docker container:
```text
./compile.sh docker
```
Build minimal CLI Debian buster based image for Odroid XU4. Use modern kernel and write image to the SD card:
```text
./compile.sh BOARD="odroidxu4" BRANCH="current" RELEASE="buster" CARD_DEVICE="/dev/sda" \
KERNEL_ONLY="no" KERNEL_CONFIGURE="no" INSTALL_HEADERS="yes" BUILD_DESKTOP="no" BUILD_MINIMAL="yes"
```
[Build parameters, advanced build options, user defined configuration, build with Docker?](#additional-information)
<p align=right><a href=#table-of-contents>⇧</a></p>
## Compare with industry standards
Check similarity, advantages and disadvantages compared with leading industry standard build software.
Function | Armbian | Yocto | Buildroot |
|:--|:--|:--|:--|
| Target | general purpose | embedded | embedded / IOT |
| U-boot and kernel | compiled from sources | compiled from sources | compiled from sources |
| Hardware support maintenance &nbsp;&nbsp; &nbsp; &nbsp;| complete | outside | outside |
| Root file system | Debian or Ubuntu based| custom | custom |
| Package manager | APT | any | none |
| Configurability | limited | large | large |
| Initramfs support | yes | yes | yes |
| Getting started | quick | very slow | slow |
| Cross compilation | yes | yes | yes |
<p align=right><a href=#table-of-contents>⇧</a></p>
## Where to download prebuilt images?
https://www.armbian.com/download/
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).
# How to build an image or a kernel?
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)).
<p align=right><a href=#table-of-contents>⇧</a></p>
- guest inside a [VirtualBox](https://www.virtualbox.org/wiki/Downloads) or other virtualization software,
- 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,
- 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),
- running natively on a dedicated PC or a server (**not** recommended),
- **25GB disk space** or more and **2GB RAM** or more available for the VM, container or native OS,
- superuser rights (configured `sudo` or root access).
## Additional information
**Execution**
- [Build parameters and advanced build options](https://docs.armbian.com/Developer-Guide_Build-Options/),
- [Make use of user defined configurations](https://docs.armbian.com/Developer-Guide_User-Configurations/),
- [Docker](https://docs.armbian.com/Developer-Guide_Building-with-Docker/) and [Vagrant](https://docs.armbian.com/Developer-Guide_Using-Vagrant/) building guides,
- Engage in [Armbian build framework forums](https://forum.armbian.com/forum/4-development/),
- Check [Jira project management application](https://armbian.atlassian.net/browse/AR) status,
- Make use of [central project search engine](https://www.armbian.com/search),
- Browse [IRC channel logs](http://irc.armbian.com) or interact at #armbian on [freenode](https://freenode.net/).
apt -y install git
git clone https://github.com/armbian/build
cd build
./compile.sh
<p align=right><a href=#table-of-contents>⇧</a></p>
Make sure that full path to the build script does not contain spaces.
## Build tools overview
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/).
```text
├── cache Work / cache directory
│   ├── rootfs Compressed vanilla Debian and Ubuntu rootfilesystem cache
│   ├── sources Kernel, u-boot and various drivers sources. Mainly C code
│   ├── toolchains External cross compilers from Linaro™ or ARM™
├── config Packages repository configurations
│   ├── targets.conf Board build target configuration
│   ├── boards Board configurations
│   ├── bootenv Initial boot loaders environments per family
│   ├── bootscripts Initial Boot loaders scripts per family
│   ├── kernel Kernel build configurations per family
│   ├── sources Kernel and u-boot sources locations and scripts
│   ├── templates User configuration templates which populate userpatches
│   └── torrents External compiler and rootfs cache torrents
├── lib Main build tools libraries
├── output Build artifact
│   └── deb Deb packages
│   └── images Bootable images - RAW or compressed
│   └── debug Patch and build logs
│   └── config Kernel configuration export location
│   └── patch Created patches location
├── packages Support scripts, binary blobs, packages
│   ├── blobs Wallpapers, various configs, closed source bootloaders
│   ├── bsp Scripts and configs overlay for rootfs
│   └── extras-buildpkgs Optional compilation and packaging engine
├── patch Collection of patches
│   ├── atf ARM trusted firmware
│   ├── kernel Linux kernel patches
| |   └── family-branch Per kernel family and branch
│   ├── misc Linux kernel packaging patches
│   └── u-boot Universal boot loader patches
| ├── u-boot-board For specific board
|    └── u-boot-family For entire kernel family
└── userpatches User: configuration patching area
├── lib.config User: tools common config/override file
├── config-default.conf User: default user config file
├── customize-image.sh User: script will execute just before closing the image
   ├── atf User: ARM trusted firmware
   ├── kernel User: Linux kernel per kernel family
   ├── misc User: various
   └── u-boot User: universal boot loader patches
```
Build process uses caching for the compilation and the debootstrap process, so consecutive runs with similar settings will be much faster.
<p align=right><a href=#table-of-contents>⇧</a></p>
# How to report issues?
## Support
Please read [this](https://github.com/igorpecovnik/lib/blob/master/.github/ISSUE_TEMPLATE.md) notice first before opening an issue.
- Have you found a bug in the **build tools**?
# How to contribute?
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).
- Do you have troubles **elsewhere**?
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/).
- [Fork](https://help.github.com/articles/fork-a-repo/) the project
- Make one or more well commented and clean commits to the repository.
- Perform a [pull request](https://help.github.com/articles/creating-a-pull-request/) in github's web interface.
- Personalized support?
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.
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).
If you are struggling, check [this detailed step by step guide on contributing](https://www.exchangecore.com/blog/contributing-concrete5-github/).
<p align=right><a href=#table-of-contents>⇧</a></p>
## Where to get more info?
## Contribute
- [Documentation](https://docs.armbian.com/Developer-Guide_Build-Preparation/ "Developer resources")
- [Prebuilt images](https://www.armbian.com/download/ "Download section")
- [Support forums](https://forum.armbian.com/ "Armbian support forum")
- Adding a new feature?
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.
- Join development?
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),
- Help elsewhere?
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).
<p align=right><a href=#table-of-contents>⇧</a></p>
## Social
- [Participate in Armbian forums](https://forum.armbian.com),
- Chat with fellow users on IRC [#armbian](https://webchat.freenode.net/?channels=armbian) on Freenode,
- Follow [@armbian on Twitter](https://twitter.com/armbian) or [LinkedIN](https://www.linkedin.com/company/armbian).
<p align=right><a href=#table-of-contents>⇧</a></p>
## Credits
- [Current and past contributors](https://github.com/armbian/build/graphs/contributors), our families and friends,
- [Support staff that keeps forums usable](https://forum.armbian.com/members/2-moderators/),
- [Individuals that help with their ideas](https://forum.armbian.com/), reports and [donations](https://www.armbian.com/donate).
<p align=right><a href=#table-of-contents>⇧</a></p>
## Sponsors
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.
[Do you want to see yourself below?](https://www.armbian.com/#contact)
<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">
<img src="https://www.armbian.com/wp-content/uploads/2018/03/kspace-150x150.png" width="144" height="144">
<img src="https://www.armbian.com/wp-content/uploads/2018/02/olimex-logo-150x150.png" width="144" height="144">
<img src="https://www.armbian.com/wp-content/uploads/2018/03/helios4_logo-150x150.png" width="144" height="144">
<p align=right><a href=#table-of-contents>⇧</a></p>