编译流程

单板信息

#---- device/milkv-duos-sd/boardconfig.sh
export MV_BOARD=milkv-duos-sd
export MV_BOARD_CPU=cv1813h
export MV_VENDOR=milkv
export MV_BUILD_ENV=milkvsetup.sh
export MV_BOARD_LINK=cv1813h_milkv_duos_sd 

通用编译脚本：build.sh

#---- build.sh
...
get_available_board              	# 查看device目录下支持的单板MILKV_BOARD_ARRAY=( $(find device ... # 收集所有单板到数组MILKV_BOARD_ARRAY中...if [ $# -ge 1 ]; thenif [ "$1" = "lunch" ]; then		# 脚本参数为lunch时，执行lunch动作choose_board || exit 0			...read -p "Which would you like: " index	# 手动选择目标单板if [[ -n $index && $index =~ ^[0-9]+$ && $index -ge 1 && $index -le $MILKV_BOARD_ARRAY_LEN ]]; thenMILKV_BOARD="${MILKV_BOARD_ARRAY[$((index - 1))]}"    	# 确认目标单板elseif [[ ${MILKV_BOARD_ARRAY[@]} =~ (^|[[:space:]])"${1}"($|[[:space:]]) ]]; then	# 检索数据MILKV_BOARD_ARRAY，查找匹配的单板MILKV_BOARD=${1}				# 确认目标单板
...									# 其他参数检查MILKV_BOARD_CONFIG=device/${MILKV_BOARD}/boardconfig.sh	# 单板配置文件get_toolchainif [ ! -d host-tools ]; then    	# 如果不存在host-tools目录，下载相关工具链toolchain_url="https://sophon-file.sophon.cn/sophon-prod-s3/drive/23/03/07/16/host-tools.tar.gz"wget ${toolchain_url} -O ${toolchain_file}export MILKV_BOARD="${MILKV_BOARD}"prepare_envsource ${MILKV_BOARD_CONFIG}							# 加载单板配置脚本，Duo S为：device/milkv-duos-sd/boardconfig.shsource build/${MV_BUILD_ENV} > /dev/null 2>&1         # 加载环境变量配置脚本： build/milkvsetup.shdefconfig ${MV_BOARD_LINK} > /dev/null 2>&1			# 加载单板配置文件，Duo S为：build/boards/cv181x/cv1813h_milkv_duos_sd/cv1813h_milkv_duos_sd_defconfig#   含Buildroot相关信息，文件：build/common_functions.sh
build_info
milkv_build										# 编译过程clean_allbuild_all										#   完整编译
milkv_pack

通用shell函数定义脚本

#---- build/common_functions.sh
function defconfig()		# defconfig依据单板配置文件推导出.config文件board=$1chip_arch=`"${BUILD_PATH}/scripts/boards_scan.py" --get-chip-arch --board_name ${board}`# if input is chip series, then list boards by chip seriesif [ "${chip_arch}" != "" ]; then_call_kconfig_script "${FUNCNAME[0]}" "${BUILD_PATH}/boards/${chip_arch}/${board}/${board}_defconfig"script=$1shift    cd $BUILD_PATH || return${BUILD_PATH}/scripts/${script}.py $@			# 生成.config文件，对Duo S为：build/scripts/defconfig.py build/.../cv1813h_milkv_duos_sd_defconfig    cvi_setup_env || return $?					# Buildroot配置，文件：build/milkvsetup.shfunction pack_rootfs		# 打包根文件系统，含根文件系统Buildroot的编译...cd "$BUILD_PATH" || returnmake rootfs										# 执行make操作，编译Buildroot，查看文件：build/Makefile

通用环境变量配置脚本

#---- build/milkvsetup.sh
function cvi_setup_env()		# 环境变量设置，截取Buidroot相关...# buildroot configexport BR_DIR="$TOP_DIR"/buildroot-2021.05export BR_BOARD=${MV_BOARD}_${SDK_VER}export BR_OVERLAY_DIR=${BR_DIR}/board/${MV_VENDOR}/${MV_BOARD}/overlayexport BR_DEFCONFIG=${BR_BOARD}_defconfig            	# Buildroot配置文件export BR_ROOTFS_DIR="$OUTPUT_DIR"/tmp-rootfsexport BR_MV_VENDOR_DIR=${BR_DIR}/board/${MV_VENDOR} function build_all()			# 完整编译build_uboot  || return $?build_kernel || return $?build_osdrv  || return $?build_middleware              || return $?pack_access_guard_turnkey_app || return $?pack_ipc_turnkey_app          || return $?pack_boot   || return $?pack_cfg    || return $?pack_rootfs || return $?						# 打包根文件系统pack_datapack_system || return $?copy_toolspack_upgrade

执行make，Makefile文件为：build/Makefile

#---- build/Makefile
...
br-rootfs-pack: export TARGET_OUTPUT_DIR=$(BR_DIR)/output/$(BR_BOARD)
br-rootfs-pack:$(call print_target)${Q}$(MAKE) -C $(BR_DIR) $(BR_DEFCONFIG) BR2_TOOLCHAIN_EXTERNAL_PATH=$(CROSS_COMPILE_PATH)	// 配置文件，Duo S为：milkv-duos-sd_musl_riscv64_defconfig${Q}$(BR_DIR)/utils/brmake -j${NPROC} -C $(BR_DIR)											// brmake工具执行编译...