Buildroot/
├── Config.in              # 顶层配置入口
├── Makefile               # 主构建逻辑
├── package/              # 软件包目录（每个软件包一个子目录）
│   ├── hello/
│   │   ├── Config.in      # 包配置选项
│   │   └── hello.mk      # 包构建规则
│   └── python3/
├── system/                # 系统骨架（rootfs模板）
└── output/                # 构建输出目录
    ├── build/            # 源码解压目录
    ├── host/             # 交叉工具链
    ├── images/           # 最终镜像
    └── target/          # 根文件系统（未打包）

yocto-project/
├── poky/
│   ├── bitbake/          # 构建引擎
│   ├── meta/             # OE-Core基础层
│   └── meta-poky/        # Poky参考层
├── meta-openembedded/    # 大量软件包
├── meta-qt5/             # Qt5支持层
├── meta-rockchip/        # RK平台BSP层
└── your-meta-layer/      # 你的自定义层

# ===== 宿主机：安装依赖 =====
sudo apt update
sudo apt install -y build-essential git make gcc g++ \
    python3 bc unzip dosfstools mtools parted \
    libncurses-dev libssl-dev bison flex

# ===== 克隆Buildroot =====
git clone https://github.com/buildroot/buildroot.git
cd buildroot

# ===== 选择RK平台默认配置 =====
make list-defconfigs | grep -i rockchip
# 输出：rockchip_rk356x_defconfig
make rockchip_rk356x_defconfig

# 打开图形配置界面
make menuconfig

# 常用配置项：
# Target options → 目标架构（ARM/ARM64/RISC-V）
# Build options → 并行编译核心数
# Toolchain → 交叉工具链配置
# System configuration → 主机名/root密码/初始化系统
# Kernel → 内核版本和配置
# Target packages → 应用软件（BusyBox/Network/wifi工具等）
# Filesystem images → 输出镜像格式（ext4/squashfs/ubi）

# ===== 开始构建（8核并行）=====
make -j$(nproc)

# ===== 构建完成，查看产物 =====
ls output/images/
# ├── rootfs.ext4          # 根文件系统镜像
# ├── rootfs.squashfs      # 压缩只读根文件系统
# ├── rk356x-sdcard.img    # 可启动SD卡镜像
# └── u-boot.itb           # Bootloader

# ===== 常用命令 =====
make defconfig          # 恢复默认配置（从defconfig恢复）
make savedefconfig      # 保存当前配置为defconfig
make clean              # 清理构建产物
make clean-all          # 完全清理（包含工具链）

# ===== 创建hello软件包 ======
mkdir package/hello
cat > package/hello/Config.in << 'EOF'
config BR2_PACKAGE_HELLO
    bool "hello"
    help
        A simple hello world program
EOF

cat > package/hello/hello.mk << 'EOF'
HELLO_VERSION = 1.0
HELLO_SITE = /home/user/src
HELLO_SITE_METHOD = local
HELLO_PROGRAMS = hello
define HELLO_BUILD_CMDS
    $(MAKE) CC="$(TARGET_CC)" CFLAGS="$(TARGET_CFLAGS)" -C $(HELLO_SRCDIR)
endef
define HELLO_INSTALL_TARGET_CMDS
    $(INSTALL) -D -m 0755 $(HELLO_SRCDIR)/hello $(TARGET_DIR)/usr/bin/hello
endef
$(eval $(generic-package))
EOF

# ===== 在配置中启用 =====
make menuconfig
# 找到 Target packages → hello → 勾选

# ===== 重新编译 =====
make hello-rebuild all

# ===== 宿主机：安装依赖 =====
sudo apt install -y gawk wget git-core diffstat \
    python3 gcc build-essential chrpath cpio \
    texinfo libsdl1.2-dev xterm locales

# ===== 克隆Poky（Yocto参考发行版）=====
git clone https://github.com/yoctoproject/poky.git
cd poky
git checkout dunfell  # dunfell为官方长期支持版本，生产环境优先选用

# ===== 初始化构建环境 =====
source oe-init-build-env build_qemu

# ===== 查看支持的机器 ======
ls conf/local.conf
# MACHINE ??= "qemux86-64"  # 默认QEMU虚拟机

# ===== 克隆RK BSP层 ======
cd ..
git clone https://github.com/rockchip-linux/meta-rockchip.git

# ===== 添加到构建环境 ======
source oe-init-build-env build_rk356x
bitbake-layers add-layer ../../meta-rockchip

# ===== 配置local.conf ======
cat >> conf/local.conf << 'EOF'
MACHINE = "rockchip-rk356x-64"
ACCEPT_FSL_EULA = "1"
EOF

# ===== 构建镜像 =====
bitbake core-image-minimal

# ===== 查看产物 =====
ls tmp/deploy/images/rockchip-rk356x-64/
# ├── core-image-minimal-rockchip-rk356x-64.rootfs.ext4
# ├── modules-5.10.72-rockchip-rk356x-64.ipk
# └── zImage -> vmlinuz-5.10.72-rockchip-rk356x-64.bin

# ===== 创建新Layer ======
bitbake-layers create-layer meta-myproduct
cd meta-myproduct

# ===== 查看Layer结构 =====
ls
# ├── conf/
# │   └── layer.conf          # Layer配置文件
# ├── recipes-core/
# │   └── images/              # 镜像定义
# └── recipes-example/
#     └── example/
#         └── example_1.0.bb  # Recipe文件

# ===== 编写Recipe（示例）=====
cat > recipes-example/example/example_1.0.bb << 'EOF'
SUMMARY = "Example application"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d799439710da5d3cf"

SRC_URI = "git://github.com/myrepo/example.git;branch=main"
SRCREV = "${AUTOREV}"

do_compile() {
    oe_runmake
}

do_install() {
    install -d ${D}${bindir}
    install -m 0755 ${S}/example ${D}${bindir}
}
EOF

# ===== 添加到构建环境 ======
bitbake-layers add-layer ../../meta-myproduct
bitbake example

# ===== 克隆OpenWrt源码 ======
git clone https://github.com/openwrt/openwrt.git
cd openwrt

# ===== 选择稳定分支 ======
git checkout openwrt-23.05  # 23.05稳定版

# ===== 安装依赖 ======
./scripts/feeds update -a
./scripts/feeds install -a

# ===== 预下载源码（避免编译中断）=====
make download

# ===== 图形化配置 =====
make menuconfig

# 关键配置项：
# Target System → ARM ARMv8 (64-bit)
# Subtarget → Rockchip ARMv8
# Target Profile → Rockchip RK356x
# LuCI → Web管理界面
# Network → 网络相关（WiFi/VPN等）

# ===== 编译 ======
# V=s 表示输出完整编译日志，方便定位报错
make V=s -j1

# 或并行编译（机器够强的话）
make -j$(nproc)

# ===== 配置WiFi（通过UCI，不用改源码）=====
# 编辑 /etc/config/wireless
config wifi-device 'radio0'
    option type 'mac80211'
    option channel '36'
    option hwmode '11a'
    option htmode 'VHT80'

config wifi-iface
    option device 'radio0'
    option network 'lan'
    option mode 'ap'
    option ssid 'MyRouter'
    option encryption 'psk2'
    option key 'mypassword'

# ===== 应用配置 ======
wifi config
/etc/init.d/network restart

# ===== 通过命令行快速配置 ======
uci set wireless.radio0.channel='6'
uci set wireless.@wifi-iface[0].ssid='NewSSID'
uci commit wireless
wifi

# ===== Buildroot调试 =====
make clean                      # 清理构建
make clean-all                  # 完全清理
make savedefconfig              # 保存当前配置
make list-defconfigs            # 列出可用配置

# ===== Yocto调试 =====
bitbake -c cleanall <package>   # 清理包构建
bitbake -e <package> | head     # 查看包变量
bitbake -g <package>            # 生成依赖图
bitbake-layers show-recipes     # 显示所有recipes

# ===== OpenWrt调试 =====
./scripts/feeds update           # 更新软件源
./scripts/feeds install <pkg>   # 安装软件包
make defconfig                  # 检查配置依赖
make kernel_menuconfig          # 内核单独配置