If you are unsure about the documentation then invoke $ grep -r -A5 -B5 "BUILD_OPTION_HERE" /path/to/local/armbian/build/repository to get context to the option from the source code.

BOARD_NAME ( company product version ): defines the board name used in welcome text, hostname and others relevant usage.The general convention is COMPANY PRODUCT VERSION - Often used as part of the scripting logic (namely for hacks) so follow the name declared in the board configuration.
- Example: OLIMEX Teres A64
BOARDFAMILY ( board-family ): defines the family of the board to apply board-specific configuration during build time such as adjustments for the temperature, LED behavior, etc..
- Refer to sources table
- Example: sun50iw1
BOARD_MAINTAINER ( space-separated list of Github login ): Declares the maintainer of the board
BOOTCONFIG ( u-boot identifier ): declares the name of the u-boot configuration for the build without the '_defconifig' suffix
- Refer to the u-boot source tree to find configuration for the board
- Example: teres-i
BOOTSIZE ( int ): Declares the size of the boot partitin in Mib
- Default: 256
- Example: 256
BOOT_LOGO ( string ): defines whether to use a eyecandy during bootloader phase
- Values:
  - yes: Show the armbian boot logo
  - desktop: Show the armbian boot logo when BUILD_DESKTOP is set to yes
- Default: not set
CRUSTCONFIG ( crust identifier ): declares the name of the crust defconfig configuration for the build. Specify only if the board has Allwinner CPU with AR100 coprocessor and SOC is supported by crust firmware.
- Refer to the crust source tree to find configuration for the board
- Example: nanopi_m1_defconfig
IMAGE_PARTITION_TABLE ( string ): defines which disklabel type to use
- Values:
  - msdos: Use dos/msdos disklabel
  - gpt: Use GPT disklabel
- Default: msdos
BOOTFS_TYPE ( filesystem ): defines the expected filesystem for the boot file system
- Values:
  - none: Uses /boot on the root filesystem
  - ext4: Use the Fourth Extended Filesystem
  - ext2: Use the Second Extended Filesystem
  - fat: Use the File Allocation Table 32
- Default: ext4
DEFAULT_OVERLAYS ( space-separated list list of dtb overlays ): defines dtb overlays that are enabled by default. There is a basic dtb for each family but they have different level of used SoC features. Board X might have four USB ports but others might not. Therefore other does not need to have those enabled while board X does.
- Examples:
  - usbhost0
  - usbhost2
  - usbhost3
  - cir
  - analog-codec
  - gpio-regulator-1.3v
  - uart1
DEFAULT_CONSOLE ( string ): declares default console for the boot output
- Values:
  - serial: Output boot messages to serial console
- Default: not set
MODULES ( space-separated list of kernel modules ): appends modules to the kernel command line for all kernel branches
MODULES_LEGACY ( space-separated list of kernel modules ): appends modules to the kernel command line for legacy kernel
MODULES_CURRENT ( space-separated list of kernel modules ): appends modules to the kernel command line for current kernel
MODULES_EDGE ( space-separated list of kernel modules ): appends modules to the kernel command line for edge kernel
MODULES_BLACKLIST ( space-separated list of kernel modules ): appends modules to the kernel's blacklist/deny list for all kernel branches
MODULES_BLACKLIST_LEGACY ( space-separated list of kernel modules ): appends modules to the kernel's blacklist/deny list for legacy kernel
MODULES_BLACKLIST_CURRENT ( space-separated list of kernel modules ): appends modules to the kernel's blacklist/deny list for current kernel
MODULES_BLACKLIST_EDGE ( space-separated list of kernel modules ): appends modules to the kernel's blacklist/deny list for edge kernel
SERIALCON ( comma-separated list of terminal interfaces [:bandwidth] ): declares which serial console should be used on the system
- Example: ttyS0:15000000,ttyGS1
SKIP_ARMBIAN_REPO ( boolean ): Whether to include the armbian repository in the built image
- Values:
  - yes: Include (default)
  - no: Do NO include
HAS_VIDEO_OUTPUT ( boolean ): defines whether the system has video output such as eye candy, bootsplash, etc..
- Values:
  - yes: Enable video-related configuration
  - no: Disable video-related configuration
KERNEL_TARGET ( comma-separated list of kernel releases or branches ): declares which kernels should be used for the build
- Values:
  - legacy: Use legacy kernel
  - current: Use current kernel
  - edge: Use edge kernel
  - [branch]: Use specified [branch] kernel
  - [none]: Exits with error
KERNEL_TEST_TARGET ( comma-separated list of kernel releases or branches ): if test targets are different for testings (internal switch)
FULL_DESKTOP ( boolean ): defines whether to install desktop stack of applications such as office, thunderbird, etc..
- Values:
  - yes: install desktop stack
  - no: doesn't install desktop stack
DESKTOP_AUTOLOGIN ( boolean ): Toggle desktop autologin
- Values:
  - yes: Automatically login to the desktop
  - no: disable desktop autologin
- Default: no
PACKAGE_LIST_BOARD ( space-separated list of packages ): Declares which packages should be installed on the system
PACKAGE_LIST_BOARD_REMOVE ( space-separated list of packages ): Declares packages to be removed from the system
BOOT_FDT_FILE ( device tree configuration ): Force to load specific device tree configuration if different from the one defined by u-boot
- Values:
  - [family]/[file.dtb]: Replace device tree with the one specified
  - none: Do not use device tree configuration
- Example: rockchip/rk3568-rock-3-a.dtb
CPUMIN ( minimum CPU frequency to scale in Hz ): Set minimal CPU frequency of the system
- Default: Differs per family 480000 for sunxi8 boards
CPUMAX ( minimum CPU frequency to scale in Hz ): Set maximal CPU frequency of the system
- Default: Differs per family 1400000 for sunxi8 boards
FORCE_BOOTSCRIPT_UPDATE ( boolean ): Force bootscript installation if they are not present
- Values:
  - yes: Enable
  - no: Disable
OVERLAY_PREFIX ( prefix ): Prefix for device tree and overlay file paths which will be set while creating an image
- Example: sun8i-h3

Deprecated

BOOTCONFIG_LEGACY ( u-boot identifier ): use BOOTCONFIG instead
BOOTCONFIG_CURRENT ( u-boot identifier ): use BOOTCONFIG instead
BOOTCONFIG_EDGE ( u-boot identifier ): use BOOTCONFIG instead
PACKAGE_LIST_BOARD_DESKTOP ( space-separated list of packages ): use PACKAGE_LIST_BOARD instead
PACKAGE_LIST_BOARD_DESKTOP_REMOVE ( space-separated list of packages ): use PACKAGE_LIST_BOARD instead

File extensions

Statuses displayed at the login prompt:

file type	description
.csc or .tvb	community creations or no active maintainer
.wip	work in progress
.eos	end of life