configs/raspberrypizero2w_poobs4

board/raspberrypi/config_zero2w_poobs4.txt

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+# Please note that this is only a sample, we recommend you to change it to fit
+# your needs.
+# You should override this file using BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE.
+# See http://buildroot.org/manual.html#rootfs-custom
+# and http://elinux.org/RPiconfig for a description of config.txt syntax
+
+start_file=start.elf
+fixup_file=fixup.dat
+
+kernel=zImage
+
+# To use an external initramfs file
+#initramfs rootfs.cpio.gz
+
+# Disable overscan assuming the display supports displaying the full resolution
+# If the text shown on the screen disappears off the edge, comment this out
+disable_overscan=1
+
+# How much memory in MB to assign to the GPU on Pi models having
+# 256, 512 or 1024 MB total memory
+gpu_mem_256=100
+gpu_mem_512=100
+gpu_mem_1024=100
+
+# fixes rpi (3B, 3B+, 3A+, 4B ,zero W and zero 2) ttyAMA0 serial console
+dtoverlay=miniuart-bt
+
+# enable autoprobing of Bluetooth driver without need of hciattach/btattach
+dtoverlay=krnbt=on
+
+#
+# pOOBs4 customization start
+#
+
+# DesignWare DWC2 driver overlay (USB OTG support)
+dtoverlay=dwc2
+
+# Disable the rainbow splash screen
+disable_splash=1
+
+# For debugging purpose
+#enable_uart=1

board/raspberrypi/rootfs_overlay_zero2w

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+rootfs_overlay_4

configs/raspberrypizero2w_poobs4_defconfig

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+BR2_arm=y
+BR2_cortex_a53=y
+BR2_ARM_FPU_NEON_VFPV4=y
+
+# Linux headers same as kernel, 5.10 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
+
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspberrypi,linux,0b54dbda3cca2beb51e236a25738784e90853b64)/linux-0b54dbda3cca2beb51e236a25738784e90853b64.tar.gz"
+BR2_LINUX_KERNEL_DEFCONFIG="bcm2709"
+
+# Build the DTB from the kernel sources
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2710-rpi-zero-2-w"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+
+BR2_PACKAGE_RPI_FIRMWARE=y
+BR2_PACKAGE_RPI_FIRMWARE_BOOTCODE_BIN=y
+BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI=y
+BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE="board/raspberrypizero2w/config_zero2w.txt"
+
+# MicroSD images generation tools
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+
+# Filesystem / image
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypizero2w/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/raspberrypizero2w/post-image.sh"
+
+#
+# pOOBs4 customization start
+#
+
+## Build Options
+BR2_CCACHE=y
+BR2_PACKAGE_OVERRIDE_FILE="$(BR2_EXTERNAL_pOOBs4_PATH)/package/package_override"
+
+## Toolchain
+BR2_TOOLCHAIN_BUILDROOT_WCHAR=y
+
+## Kernel
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_pOOBs4_PATH)/board/poobs4/common/linux-fragment.config"
+
+## Filesystem Images
+BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_pOOBs4_PATH)/board/raspberrypi/rootfs_overlay_4/ $(BR2_EXTERNAL_pOOBs4_PATH)/board/poobs4/common/rootfs_overlay/"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypizero2w/post-build.sh $(BR2_EXTERNAL_pOOBs4_PATH)/board/poobs4/common/post_build.sh"
+
+## Packages
+# use haveged for better entropy
+BR2_PACKAGE_URANDOM_SCRIPTS=n
+BR2_PACKAGE_HAVEGED=y
+
+# wireless support
+BR2_PACKAGE_IW=y
+BR2_PACKAGE_WIRELESS_TOOLS=y
+BR2_PACKAGE_WIRELESS_TOOLS_LIB=y
+BR2_PACKAGE_WPA_SUPPLICANT=y
+BR2_PACKAGE_WPA_SUPPLICANT_NL80211=y
+BR2_PACKAGE_WPA_SUPPLICANT_CLI=y
+
+# busybox
+BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config"
+BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_pOOBs4_PATH)/board/poobs4/common/busybox-fragment.config"
+
+# openssh
+BR2_PACKAGE_OPENSSH=y
+
+# hostapd
+BR2_PACKAGE_HOSTAPD=y
+
+# dnsmasq
+BR2_PACKAGE_DNSMASQ=y
+BR2_PACKAGE_DNSMASQ_DHCP=y
+
+# nano
+BR2_PACKAGE_NANO=y
+
+## Firmware
+BR2_PACKAGE_LINUX_FIRMWARE=y
+
+# ! On-board Wi-Fi module
+# BCM43XXX (fw), driver is included by kernel defconfig (bcm2709)
+BR2_PACKAGE_BRCMFMAC_SDIO_FIRMWARE_RPI=y
+BR2_PACKAGE_BRCMFMAC_SDIO_FIRMWARE_RPI_WIFI=y
+
+# ! Wi-Fi USB dongle
+# board doesn't have a USB host port
+
+# Raspberry Pi Configuration
+BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE="$(BR2_EXTERNAL_pOOBs4_PATH)/board/raspberrypi/config_zero2w_poobs4.txt"