Building WPE with Yocto for Raspberry Pi Zero W

wpe-yocto.md

Repositories Cloning

BRANCH=master  # or 'rocko'
xargs -n 1 git clone -b $BRANCH <<'__EOF__'
git://git.yoctoproject.org/poky
git://git.openembedded.org/meta-openembedded
git://github.com/agherzan/meta-raspberrypi
git://github.com/webplatformforembedded/meta-wpe
__EOF__

Patching

In rocko, fix building of mesa-gl in meta-raspberrypi for ARMv6 (source):

cat <<'__EOF__' >> meta-raspberrypi/recipes-graphics/mesa/mesa-gl_%.bbappend
CFLAGS_append_armv6 = " -DMISSING_64BIT_ATOMICS"
__EOF__

Image Building

Build dependencies (install user or system wide once):

• chrpath: https://chrpath.alioth.debian.org/
• diffstats: http://invisible-island.net/diffstat/

Create build directory and add layers:

source poky/oe-init-build-env
xargs -n 1 bitbake-layers add-layer <<'__EOF__'
../meta-openembedded/meta-oe
../meta-openembedded/meta-python
../meta-openembedded/meta-multimedia
../meta-openembedded/meta-networking
../meta-raspberrypi
../meta-wpe
__EOF__

Configure the build:

cat <<'__EOF__' >> conf/local.conf
    
# configuration
MACHINE = "raspberrypi0-wifi"
SERIAL_CONSOLE = ""
DISABLE_RPI_BOOT_LOGO = "1"
DISABLE_OVERSCAN = "1"
DISABLE_SPLASH = "1"
BOOT_DELAY = "0"
GPU_MEM_256 = "128"
GPU_MEM_512 = "196"
GPU_MEM_1024 = "396"
DISTRO_FEATURES_remove = "x11"
DISTRO_FEATURES_append = " opengl"
PACKAGE_CLASSES = "package_ipk"
IMAGE_INSTALL_append = " chrony"
IMAGE_INSTALL_append = " linux-firmware-bcm43430 wpa-supplicant"
IMAGE_FSTYPES = "tar.bz2 ext4 rpi-sdimg"
SDIMG_ROOTFS_TYPE = "ext4"
__EOF__

For basic Bluetooth support:

cat <<'__EOF__' >> conf/local.conf
IMAGE_INSTALL_append = " bluez5 udev-rules-rpi"
__EOF__

Westeros Backend

Build the image:

bitbake wpe-westeros-image

EGLFS Backend

Remove wayland and set the WPE backend and platform to rpi:

cat <<'__EOF__' >> conf/local.conf
WPE_BACKEND = "rpi"
WPE_PLATFORM = "rpi"
DISTRO_FEATURES_remove = "wayland"
__EOF__

Build the image:

bitbake wpe-eglfs-image

Running Image Configuration

Networking Setup

• Set wlan0 to auto in /etc/network/interfaces.
• Remove auto from eth0 in /etc/network/interfaces.
• Edit /etc/wpa_supplicant.conf to add your wireless networks configuration.

Bluetooth Setup

You need to attach the firmware to the HCI:

/usr/bin/hciattach /dev/serial1 bcm43xx 921600 noflow -

This is an old thread, but for those (like me) who come across this later, there is support for headless configuratio. Add the following line to your local.conf:
ENABLE_DWC2_PERIPHERAL = "1"
And the Raspberry-Pi can be run in device mode.