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Raspberry PI
Note: You only need this if you do not have an existing OpenEmbedded Yocto environment.
Make sure you install the repo command by Google first.
create a workspace for your yocto build:
$ mkdir -p rpi-yocto
Inside the newly created directory, initiate the repository
$ repo init -u ssh://git@github.com/WebPlatformForEmbedded/meta-wpe.git -b morty -m tools/manifests/rpi-yocto.xml
Fetch and sync all repositories:
$ repo sync
Initiate OE by invoking the oe init script:
source poky/oe-init-build-env rpi-ml-build
or at least for Morty build
source openembedded-core/oe-init-build-env rpi-ml-build
Add bb layers:
bitbake-layers add-layer ../meta-openembedded/meta-oe
bitbake-layers add-layer ../meta-openembedded/meta-python
bitbake-layers add-layer ../meta-openembedded/meta-multimedia
bitbake-layers add-layer ../meta-openembedded/meta-networking
bitbake-layers add-layer ../meta-raspberrypi
bitbake-layers add-layer ../meta-wpeEdit conf/local.conf and set the target machine:
MACHINE = "raspberrypi3"
Remove x11 from Distro features since we use wayland+westeros
DISTRO_FEATURES_remove = "x11"
Add opengl to Distro Features
DISTRO_FEATURES_append = " opengl"
you can use raspberrypi2 as well if you own raspberrypi2 machine.
To set a different GCC e.g. 6.3:
GCCVERSION = "6.%"
Build WPE with Westeros Compositor (DISTRO_FEATURES_append = " wayland" required):
$ bitbake wpe-westeros-image
Or build WPE with full screen EGL:
$ bitbake wpe-eglfs-image
To flash the sdimg on the sd card:
$ sudo dd if=tmp/deploy/images/raspberrypi3/wpe-westeros-image-raspberrypi3.rpi-sdimg of=/dev/sdX
Optionally it is possible to use the RPI directly on top of RPI userland for the EGL. To achieve this add the following lines to the local config:
WPE_BACKEND = "rpi libinput"
WPE_PLATFORM = "egl"
NETFLIX_BACKEND = "rpi"
DISTRO_FEATURES_remove = "wayland"
Use 4.9 kernel (optional), edit conf/local.conf and set:
PREFERRED_VERSION_linux-raspberrypi = "4.9%"
To build without Westeros/Wayland support on RPI (fullscreen EGL), edit conf/local.conf and set:
WPE_BACKEND_rpi = "rpi"
DISTRO_FEATURES_remove = "wayland"
Note WPE has many other view backends it can use. To select specific setting, like BCM Nexus or IntelCE edit your conf/local.conf and set the WPE_BACKEND = foo directly.
To build an initramfs image, edit conf/local.conf and set:
INITRAMFS_IMAGE_BUNDLE_rpi = "1"
INITRAMFS_IMAGE_rpi = "wpe-initramfs-image"
KERNEL_INITRAMFS = "-initramfs" BOOT_SPACE = "163840"
To install the initram fs, copy the zImage to the fat32 partition of your RPI.