Embedded Linux (eLinux) embedding for Flutter

This project was created to develop non-official embedded Linux embeddings of Flutter. This embedder is focusing on embedded Linux system use cases. It is also implemented based on Flutter desktop for Windows and has some unique features to use it in embedded systems.

Note that this project is the source code of the embedder, so flutter app developers should use flutter-elinux, which is a non-official extension to the Flutter SDK to build and debug Flutter apps for embedded Linux devices.

Objective & Goal

Our objective is to use Flutter in embedded systems. We're developing this embedder to use Flutter in embedded products. Ultimately we would like to propose and contribute this software to the mainline of Flutter Engine, which means we would like to add an embedded systems version into the Flutter repo for all embedded developers. Please note that this is just our ideal, not the official opinion of the Flutter community.

We would be grateful if you could give us feedback on bugs and new feature requests. We would like to cover the specifications of general-purpose embedded systems.

Features

Flutter embedder optimized for Embedded Systems
- Minimal dependent libraries
- Lightweight than Flutter desktop for Linux (Not using X11 and GTK)
- The main target of this embedder is Arm64 devices. We haven't confirmed in Arm 32bit (ARMv7, armhf) devices
Display backend support
- Wayland
- Direct rendering module (DRM)
  - Generic Buffer Management (GBM)
  - EGLStream for NVIDIA devices
Always single window fullscreen
- You can choose always-fullscreen or flexible-screen (any size) only when using Wayland/X11 backend
Keyboard, mouse and touch inputs support
Equivalent quality to Flutter desktops
API compatibility with Flutter desktop for Windows and GLFW
- APIs such as MethodChannel and EventChannel are completely the same with them

Companion repos

Repo	Purpose
flutter-elinux	Flutter tools for eLinux
flutter-elinux-plugins	Flutter plugins for eLinux
flutter-embedded-linux	eLinux embedding for Flutter
meta-flutter	Yocto recipes of eLinux embedding for Flutter

Documentation

Documentation for this software is summarised on the Wiki.

Supported platforms

This embedder supports x64 and Arm64 (aarch64, ARMv8) architectures on Linux which supports either Wayland backend or DRM backend.

Tested devices

Board / SoC	Vendor	OS / BSP	Backend	Status
Jetson Nano	NVIDIA	JetPack 4.3	Wayland	✔️
Jetson Nano	NVIDIA	JetPack 4.3	DRM	✔️ (#1)
Raspberry Pi 4 Model B	Raspberry Pi Foundation	Ubuntu 20.10	Wayland	✔️
Raspberry Pi 4 Model B	Raspberry Pi Foundation	Ubuntu 20.10	DRM	✔️ (#9)
i.MX 8MQuad EVK	NXP	Sumo (kernel 4.14.98)	Wayland	✔️
i.MX 8M Mini EVKB	NXP	Zeus (kernel 5.4.70)	Wayland	✔️
RB5 Development Kit	Qualcomm	Ubuntu 18.04.05	DRM	✔️
Zynq	Xilinx	-	-	Not tested
Desktop (x86_64)	Intel	Ubuntu 20.04	Wayland	✔️
Desktop (x86_64)	Intel	Ubuntu 20.04	DRM	✔️
Desktop (x86_64)	Intel	Ubuntu 20.04	X11	✔️
QEMU (x86_64)	QEMU	AGL (Automotive Grade Linux) koi	Wayland	✔️
QEMU (x86_64)	QEMU	AGL (Automotive Grade Linux) koi	DRM	✔️

Note

i.MX 8M platforms don't support applications using EGL on GBM, which means the DRM-GBM backend won't work on i.MX 8M devices.

Tested Wayland compositors


Weston	✔️	Sway	✔️	Wayfire	✔️	Gnome	✔️	Phosh	✔️
Cage	✔️	Lomiri	✔️	Plasma Wayland	✔️	Plasma Mobile	✔️	GlacierUX	✔️

Contributing

Now, we cannot accept any Pull Request (PR). Because We are building a system (e.g. CLA) to accept PRs, so please wait for a while the system is getting ready! However, we are always welcome to report bugs and request new features by creating issues.

With the assumption, our final goal of this software openly is to be merged this embedder into Flutter Engine after getting feedbacks. And Google CLA will be required when we do that in the future. Therefore, we cannot easily accept an external PR. However, you can free to create issues for reporting bugs and requesting new features.

See also: Contributing to the Flutter engine

License

Joanneyuy/flutter-embedded-linux

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