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nerves_system_openwrt_one

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Nerves System - OpenWRT One (MediaTek MT7981B / Filogic 820)

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nerves_system_openwrt_one nerves_defconfig
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nerves_defconfig 

BR2_aarch64=y

BR2_cortex_a53=y

BR2_ARM_FPU_VFPV4=y

BR2_TOOLCHAIN_EXTERNAL=y

BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y

BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y

BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/nerves-project/toolchains/releases/download/v14.2.0/nerves_toolchain_aarch64_nerves_linux_gnu-linux_${shell uname -m}-14.2.0-C3B80E7.tar.xz"

BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX="aarch64-nerves-linux-gnu"

BR2_TOOLCHAIN_EXTERNAL_GCC_14=y

# Acknowledge that rng-tools is no longer a forced dependency in Nerves

# (Linux >= 5.6 doesn't need it; if entropy ever becomes a real problem

# on this hardware we can re-enable it).

BR2_PACKAGE_NERVES_CONFIG_ACCEPT_RNG_NOTICE=y

BR2_TOOLCHAIN_EXTERNAL_HEADERS_5_4=y

BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y

# BR2_TOOLCHAIN_EXTERNAL_INET_RPC is not set

BR2_TOOLCHAIN_EXTERNAL_CXX=y

BR2_TOOLCHAIN_EXTERNAL_FORTRAN=y

BR2_TOOLCHAIN_EXTERNAL_OPENMP=y

BR2_TAR_OPTIONS="--no-same-owner"

BR2_BACKUP_SITE="http://dl.nerves-project.org"

BR2_ENABLE_DEBUG=y

BR2_GLOBAL_PATCH_DIR="${BR2_EXTERNAL_NERVES_PATH}/patches ${NERVES_DEFCONFIG_DIR}/patches"

BR2_REPRODUCIBLE=y

BR2_ROOTFS_SKELETON_CUSTOM=y

BR2_ROOTFS_SKELETON_CUSTOM_PATH="${BR2_EXTERNAL_NERVES_PATH}/board/nerves-common/skeleton"

BR2_INIT_NONE=y

BR2_ROOTFS_DEVICE_TABLE="${BR2_EXTERNAL_NERVES_PATH}/board/nerves-common/device_table.txt"

BR2_ENABLE_LOCALE_WHITELIST="locale-archive"

BR2_GENERATE_LOCALE="en_US.UTF-8"

BR2_ROOTFS_OVERLAY="${BR2_EXTERNAL_NERVES_PATH}/board/nerves-common/rootfs_overlay ${NERVES_DEFCONFIG_DIR}/rootfs_overlay"

BR2_ROOTFS_POST_BUILD_SCRIPT="${NERVES_DEFCONFIG_DIR}/post-build.sh ${BR2_EXTERNAL_NERVES_PATH}/board/nerves-common/post-build.sh"

BR2_ROOTFS_POST_IMAGE_SCRIPT="${NERVES_DEFCONFIG_DIR}/post-createfs.sh"



# Linux 6.18.12 (the version that ships with Buildroot 2025.11.2 in

# nerves_system_br 1.33.4). Our DTS additions live in patches/linux/.

# 6.18 mainline mt7981b-openwrt-one.dts is still minimal (15 lines)

# so we keep our full-DTS replacement patch.

BR2_LINUX_KERNEL=y

BR2_LINUX_KERNEL_CUSTOM_VERSION=y

BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.12"

BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y

BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="${NERVES_DEFCONFIG_DIR}/linux-6.18.defconfig"

BR2_LINUX_KERNEL_DTS_SUPPORT=y

BR2_LINUX_KERNEL_INTREE_DTS_NAME="mediatek/mt7981b-openwrt-one"

BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME=y

BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y

BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="Image"

BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y



# BusyBox configuration (use Nerves defaults)

BR2_PACKAGE_BUSYBOX_CONFIG="${BR2_EXTERNAL_NERVES_PATH}/board/nerves-common/busybox.config"



# Networking userspace

BR2_PACKAGE_CA_CERTIFICATES=y

BR2_PACKAGE_NFTABLES=y

BR2_PACKAGE_WIRELESS_REGDB=y

BR2_PACKAGE_WPA_SUPPLICANT=y

BR2_PACKAGE_WPA_SUPPLICANT_WIRED=y

BR2_PACKAGE_WPA_SUPPLICANT_AP_SUPPORT=y

BR2_PACKAGE_WPA_SUPPLICANT_MESH_NETWORKING=y

BR2_PACKAGE_WPA_SUPPLICANT_AUTOSCAN=y

BR2_PACKAGE_WPA_SUPPLICANT_HOTSPOT=y

BR2_PACKAGE_WPA_SUPPLICANT_DEBUG_SYSLOG=y

BR2_PACKAGE_WPA_SUPPLICANT_WPS=y

BR2_PACKAGE_WPA_SUPPLICANT_WPA3=y

BR2_PACKAGE_WPA_SUPPLICANT_CTRL_IFACE=y

BR2_PACKAGE_HOSTAPD=y

BR2_PACKAGE_IW=y



# MTD/UBI userspace tools (needed for fwup writing to UBI volumes

# at runtime, plus mtd-utils for general flash management).

# MKFSUBIFS gives us mkfs.ubifs so /data can be lazily formatted

# on first boot — see post-build.sh and rootfs_overlay/etc/init.d/.

BR2_PACKAGE_MTD=y

BR2_PACKAGE_MTD_MKFSUBIFS=y



# Random number generation

# BR2_PACKAGE_RNG_TOOLS_JITTERENTROPY_LIBRARY is not set



# Filesystem images

# Squashfs is the default Nerves rootfs format. We additionally produce

# cpio.gz so we can embed it as an initramfs in our FIT image for NAND

# boot — the OpenWRT One has 1 GB of RAM so loading the rootfs into RAM

# is fine for now.

BR2_TARGET_ROOTFS_CPIO=y

BR2_TARGET_ROOTFS_CPIO_GZIP=y

# BR2_TARGET_ROOTFS_TAR is not set



# Host tools required to build the FIT and UBI images for SPI NAND.

# FIT_SUPPORT compiles mkimage with CONFIG_FIT and pulls in host-dtc;

# without it, Buildroot's mkimage can't generate .itb from .its (the

# internal dtc invocation has an empty path and the shell errors with

# "sh: 1: -I: not found").

BR2_PACKAGE_HOST_UBOOT_TOOLS=y

BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y

BR2_PACKAGE_HOST_MTD=y

BR2_PACKAGE_HOST_KMOD_XZ=y



# Nerves system metadata

BR2_NERVES_SYSTEM_NAME="nerves_system_openwrt_one"

BR2_NERVES_ADDITIONAL_IMAGE_FILES="${NERVES_DEFCONFIG_DIR}/fwup.conf"



# Nerves runtime helpers

BR2_PACKAGE_NBTTY=y

BR2_PACKAGE_NERVES_CONFIG=y