linux-kernel-module-cheat/buildroot_config_fragment

BR2_GLOBAL_PATCH_DIR="../global_patch_dir"
BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="../busybox_config_fragment"
BR2_PACKAGE_KERNEL_MODULE=y
BR2_PACKAGE_OVERRIDE_FILE="../buildroot_override"
BR2_PACKAGE_STRACE=y
BR2_ROOTFS_OVERLAY="../rootfs_overlay"
BR2_ROOTFS_POST_BUILD_SCRIPT="../rootfs_post_build_script"
BR2_ROOTFS_USERS_TABLES="../user_table"
# Generate output/images/rootfs.cpio
BR2_TARGET_ROOTFS_CPIO=y

# Host GDB
BR2_GDB_VERSION="7.11.1"
BR2_GDB_VERSION_7_10=n
BR2_GDB_VERSION_7_11=y
BR2_GDB_VERSION_7_12=n
BR2_PACKAGE_HOST_GDB=y
BR2_PACKAGE_HOST_GDB_PYTHON=y
BR2_PACKAGE_HOST_GDB_SIM=y
BR2_PACKAGE_HOST_GDB_TUI=y

# gdbserver
BR2_DEBUG_3=y
BR2_ENABLE_DEBUG=y
BR2_OPTIMIZE_0=y
BR2_PACKAGE_GDB=y
BR2_PTHREAD_DEBUG=y

# QEMU
BR2_PACKAGE_HOST_QEMU=y
# False because otherwise we need the host to be as recent as guest, and the build fails with:
# package/qemu/qemu.mk:110: *** "Refusing to build qemu-user: target Linux version newer than host's.".  Stop.
BR2_PACKAGE_HOST_QEMU_LINUX_USER_MODE=n
BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
BR2_PACKAGE_HOST_QEMU_VDE2=y

# ftrace
BR2_PACKAGE_TRACE_CMD=y

# GPIO: lsgpio, gpio-event-mon, gpio-hammer
# Breask MIPS build in 2017-02:
# https://bugs.busybox.net/show_bug.cgi?id=10276
BR2_PACKAGE_LINUX_TOOLS=y
BR2_PACKAGE_LINUX_TOOLS_GPIO=y

# DTC
BR2_PACKAGE_DTC=y
BR2_PACKAGE_DTC_PROGRAMS=y
BR2_PACKAGE_HOST_DTC=y

# Provides setpci and a lspci more advanced than Busybox's
#
# setpci can read and write to PCI configuration registers.
#
# Read is possible from Linux with:
#
#     hexdump /sys/bus/pci/devices/0000:00:05.0/config
#
# and /dev/mem can of course do both reads and writes,
# but setpci provies nice human readable register names, e.g.:
#
#     setpci --dumpregs
#
# then and then get the values with either bus or device id:
#
#     setpci -s 0000:00:05.0 BASE_ADDRESS_0
#     setpci -d 1234:11e9 BASE_ADDRESS_0
#
# Note however that BASE_ADDRESS_0 also appears when you do:
#
#     lspci -v
#
# Then you can try messing with that address with:
#
#     devmem2 0xfeb52000 w 0x12345678
#
# which for our pci_min device fires interrupts.
#
BR2_PACKAGE_PCIUTILS=y