meta-flutter

Notice: Layer has moved to https://github.com/meta-flutter/meta-flutter. Redirection will be automatic in the next couple of weeks.

Yocto Layer for Flutter related artifacts.

Recommended development flow starts with making an embedder run on desktop, then target. This approach will save you a good deal of time and aggrevation.

Note: In theory Swift Shader (CPU render) engine builds should work with the right build flags. Be warned it won't work out of the box. Select a SoC with a GPU that supports OpenGL 3.0+ and save yourself the Engineering NRE.

Note: If you get a gray screen running the Gallery app, chances are you don't have LC_ALL set. Check /usr/share/locale/ on your target for available locale, and set LC_ALL appropriately. Example: export LC_ALL=en_GB

Layers dependencies

• meta-clang Toyota and Sony embedders

Overview

Target BSP is expected to have a GPU with OpenGLES v3.0+ support.

This layer includes recipes to build

• flutter-engine (channel selection, default is beta)
• flutter-sdk (channel selection, default is beta)
• fltter-gallery Application (interpreted and AOT - requires master channel override)
• flutter-pi (DRM w/VSync)
• flutter-wayland (basic POC) / waylandpp/ipugxml (archived)
• Toyota ivi-homescreen (Recommended)
• Sony embedders

Notes

Targets flutter-engine is known to work on

• AGL QEMU images - x86_64
• DragonBoard 410c - aarch64
• Intel MinnowBoard Max (BayTrail) - intel-icore7-64
• NVIDIA Nano Dev Kit - aarch64
• NVIDIA Xavier NX Dev Kit - aarch64
• Raspberry Pi 3 / Compute - aarch64 / armv7hf
• Raspberry Pi 4 / Compute - aarch64
• Renesas R-Car m3ulcb - aarch64
• STM32MP157x - cortexa7t2hf
• etc, etc

Building for ARM (32-bit) has an outstanding P4 bug on this: flutter/flutter#83765

NVIDIA Xavier/Nano

local.conf changes

TARGET_GCC_VERSION = "8.3.0"
FLUTTER_CHANNEL = "master"
IMAGE_INSTALL_append = " flutter-drm-eglstream-backend"
IMAGE_INSTALL_append = " flutter-gallery"

OR

TARGET_GCC_VERSION = "8.3.0"
FLUTTER_CHANNEL = "master"
CORE_IMAGE_EXTRA_INSTALL += "\
    flutter-drm-eglstream-backend \
    flutter-gallery \
"

Build EGL image

bitbake demo-image-egl

Run Flutter application on target (defaults to AOT)

FLUTTER_DRM_DEVICE=/dev/dri/card0 flutter-drm-eglstream-backend -b /usr/share/flutter-gallery/sony

NXP i.MX 8QuadXPlus MEK

repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-gatesgarth -m imx-5.10.9-1.0.0.xml
repo sync -j20
DISTRO=fslc-wayland MACHINE=imx8qxpmek source setup-environment build
pushd ../sources
git clone -b dunfell https://github.com/jwinarske/meta-flutter.git
popd
bitbake-layers add-layer ../sources/meta-clang ../sources/meta-flutter
echo -e 'TARGET_GCC_VERSION = "10.2.0"' >> conf/local.conf
echo -e 'FLUTTER_CHANNEL = "dev"' >> conf/local.conf
echo -e 'IMAGE_INSTALL_append = " flutter-wayland"' >> conf/local.conf
echo -e 'IMAGE_INSTALL_append = " flutter-gallery"' >> conf/local.conf
bitbake fsl-image-multimedia
...
Build Configuration:
BB_VERSION           = "1.48.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "aarch64-fslc-linux"
MACHINE              = "imx8qxpmek"
DISTRO               = "fslc-wayland"
DISTRO_VERSION       = "3.2-snapshot-20210616"
TUNE_FEATURES        = "aarch64 armv8a crc cortexa35 crypto"
TARGET_FPU           = ""

Raspberry PI 3/4 (aarch64)

export MACHINE=raspberrypi4-64

or

export MACHINE=raspberrypi3-64

mkdir rpi_yocto && cd rpi_yocto
repo init -u https://github.com/jwinarske/manifests.git -m rpi64.xml -b dunfell
repo sync -j20
source ./setup-environment $MACHINE
bitbake-layers add-layer ../sources/meta-clang ../sources/meta-flutter
echo -e 'FLUTTER_CHANNEL = "dev"' >> conf/local.conf
echo -e 'IMAGE_INSTALL_append = " flutter-pi"' >> conf/local.conf
echo -e 'IMAGE_INSTALL_append = " flutter-gallery"' >> conf/local.conf
bitbake core-image-minimal

Note: you may want/need to increase the GPU_MEM value. It's defaulting to 64.

STM32MP157x Discovery Board (doesn't include build hack)

Setup Ubuntu 16.04 for building Yocto images. envsetup.sh will complain if you're missing a package.

mkdir openstlinux-5.10-dunfell-mp1-21-03-31 && cd openstlinux-5.10-dunfell-mp1-21-03-31
repo init -u https://github.com/STMicroelectronics/oe-manifest.git -b refs/tags/openstlinux-5.10-dunfell-mp1-21-03-31
repo sync -j20
DISTRO=openstlinux-eglfs MACHINE=stm32mp1-disco source layers/meta-st/scripts/envsetup.sh
pushd ../layers
git clone -b dunfell https://github.com/jwinarske/meta-flutter.git
git clone -b dunfell https://github.com/kraj/meta-clang.git
popd
bitbake-layers add-layer ../layers/meta-flutter ../layers/meta-clang
echo -e 'MACHINE_FEATURES_remove = "fip"\n' >> conf/local.conf
echo -e 'DISTRO_FEATURES_remove = "wayland"\n' >> conf/local.conf
echo -e 'DISTRO_FEATURES_remove = "x11"\n' >> conf/local.conf
echo -e 'FLUTTER_CHANNEL = "master"\n' >> conf/local.conf
echo -e 'CORE_IMAGE_EXTRA_INSTALL += " \' >> conf/local.conf
echo -e '  flutter-pi \' >> conf/local.conf
echo -e '  flutter-drm-gbm-backend \' >> conf/local.conf
echo -e '  flutter-gallery \' >> conf/local.conf
echo -e '"' >> conf/local.conf
cat conf/local.conf
bitbake st-image-core
...
TARGET_SYS      = "arm-ostl-linux-gnueabi"
MACHINE         = "stm32mp1-disco"
DISTRO          = "openstlinux-eglfs"
DISTRO_VERSION  = "3.1-snapshot-20210602"
TUNE_FEATURES   = "arm vfp cortexa7 neon vfpv4 thumb callconvention-hard"
TARGET_FPU      = "hard"

See release notes regarding "fip": https://wiki.st.com/stm32mpu/wiki/STM32MP15_OpenSTLinux_release_note

Build EGL image

bitbake demo-image-egl

Run Flutter application on target (defaults to AOT)

FLUTTER_DRM_DEVICE=/dev/dri/card0 flutter-drm-eglstream-backend -b /usr/share/flutter-gallery/sony

General Yocto Notes

When building on systems with GCC version > than uninative in Yocto distro add the following to conf/local.conf

INHERIT_remove = "uninative"