custom configuration for Raspberry Pi Zero W

conf/layer.conf

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+# We have a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have recipes-* directories, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
+			${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "helium-rpi"
+BBFILE_PATTERN_helium-rpi = "^${LAYERDIR}/"
+BBFILE_PRIORITY_helium-rpi = "6"
+
+# This should only be incremented on significant changes that will
+# cause compatibility issues with other layers
+LAYERVERSION_helium-rpi = "2"
+
+
+LAYERDEPENDS_helium-rpi = "core raspberrypi helium"
+LAYERSERIES_COMPAT_helium-rpi = "mickledore"
+
+LICENSE_FLAGS_ACCEPTED = "synaptics-killswitch"

conf/machine/include/rpi-common.inc

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+# Raspberry Pi Helium common configuration
+
+ENABLE_UART = "1"
+ENABLE_I2C = "1"
+ENABLE_SPI_BUS = "1"
+ENABLE_W1 = "1"

conf/machine/rpi-zero-w.conf

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+#@TYPE: Machine
+#@NAME: RaspberryPi Zero WiFi Development Board
+
+require conf/machine/include/rpi-common.inc
+require conf/machine/raspberrypi0-wifi.conf
+
+KBUILD_DEFCONFIG:rpi-zero-w = "bcmrpi_defconfig"
+RPI_KERNEL_DEVICETREE = "bcm2708-rpi-zero-w.dtb"

recipes-bsp/bootfiles/rpi-bootfiles.bbappend

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+# Enable UART output from bootcode.bin
+
+do_configure() {
+	sed -i -e "s/BOOT_UART=0/BOOT_UART=1/" ${S}/bootcode.bin
+}

recipes-core/images/helium-image-rpi.bb

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+SUMMARY = "Helium image for Raspberry Pi"
+LICENSE = "MIT"
+
+require recipes-core/images/helium-image-default.bb
+DEPENDS += "rpi-bootfiles"
+