BSP RootFS 통합 — Buildroot·Yocto와 보드별 패키지 묶기

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bsp-mybsp/
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├── external.desc           # 트리 이름과 desc
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├── external.mk             # 추가 패키지의 Makefile include
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├── Config.in               # 추가 패키지의 Kconfig include
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├── configs/
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│   └── mybsp_defconfig
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├── board/
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│   └── mybsp/
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│       ├── linux.fragment   # kernel config 단편
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│       ├── busybox.fragment # busybox config 단편
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│       ├── genimage.cfg     # 이미지 조립
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│       ├── post-build.sh    # rootfs 후처리
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│       └── post-image.sh    # 최종 이미지 조립
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├── package/
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│   ├── mybsp-init/
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│   │   ├── Config.in
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│   │   ├── mybsp-init.mk
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│   │   └── mybsp-init.service
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│   └── mybsp-firmware/
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└── patches/
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    ├── linux/
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    │   └── 0001-arm-dts-add-mybsp.patch
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    └── uboot/
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        └── 0001-board-mybsp-fixup.patch

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name: MYBSP
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desc: BSP for MyBoard rev A/B

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# mybsp_defconfig 발췌
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BR2_arm=y
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BR2_cortex_a7=y
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BR2_LINUX_KERNEL=y
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BR2_LINUX_KERNEL_CUSTOM_GIT=y
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BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="v6.6.30"
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BR2_LINUX_KERNEL_DEFCONFIG="multi_v7"
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BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_MYBSP_PATH)/board/mybsp/linux.fragment"
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BR2_LINUX_KERNEL_INTREE_DTS_NAME="mybsp"
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BR2_GLOBAL_PATCH_DIR="$(BR2_EXTERNAL_MYBSP_PATH)/patches"
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BR2_PACKAGE_MYBSP_INIT=y
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BR2_PACKAGE_MYBSP_FIRMWARE=y
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BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_MYBSP_PATH)/board/mybsp/overlay"
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BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_MYBSP_PATH)/board/mybsp/post-build.sh"
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BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_MYBSP_PATH)/board/mybsp/post-image.sh"

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board/mybsp/overlay/
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├── etc/
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│   ├── hostname
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│   ├── network/interfaces
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│   └── ssh/
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│       └── sshd_config
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├── opt/
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│   └── mybsp/
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│       └── default.cfg
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└── usr/
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    └── lib/
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        └── firmware/
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            └── mybsp-fw.bin

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package/mybsp-init/
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├── Config.in
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└── mybsp-init.mk

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meta-mybsp/
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├── conf/
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│   ├── layer.conf
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│   ├── machine/
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│   │   └── mybsp.conf
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│   └── distro/
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│       └── mybsp-distro.conf
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├── recipes-bsp/
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│   ├── u-boot/
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│   │   ├── u-boot-mybsp_2024.04.bb
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│   │   └── u-boot-mybsp/
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│   │       └── 0001-board-mybsp.patch
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│   └── formfactor/
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├── recipes-kernel/
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│   └── linux/
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│       ├── linux-mybsp_6.6.bb
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│       └── linux-mybsp/
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│           ├── defconfig
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│           ├── mybsp.cfg
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│           └── 0001-arm-dts-mybsp.patch
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├── recipes-core/
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│   ├── images/
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│   │   └── mybsp-image.bb
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│   └── mybsp-init/
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│       └── mybsp-init_1.2.0.bb
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└── wic/
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    └── mybsp.wks

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BBPATH .= ":${LAYERDIR}"
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BBFILES += "${LAYERDIR}/recipes-*/*/*.bb"
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BBFILE_COLLECTIONS += "mybsp"
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BBFILE_PATTERN_mybsp = "^${LAYERDIR}/"
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BBFILE_PRIORITY_mybsp = "10"
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LAYERSERIES_COMPAT_mybsp = "kirkstone scarthgap"

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#@TYPE: Machine
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#@NAME: MyBoard Rev A
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#@DESCRIPTION: Machine configuration for MyBoard
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require conf/machine/include/arm/armv7a/tune-cortexa7.inc
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KERNEL_IMAGETYPE = "zImage"
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KERNEL_DEVICETREE = "mybsp.dtb"
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PREFERRED_PROVIDER_virtual/kernel = "linux-mybsp"
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PREFERRED_PROVIDER_virtual/bootloader = "u-boot-mybsp"
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UBOOT_MACHINE = "mybsp_defconfig"
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UBOOT_ENTRYPOINT = "0x40008000"
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UBOOT_LOADADDRESS = "0x40008000"
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SERIAL_CONSOLES = "115200;ttyS0"
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IMAGE_FSTYPES = "ext4 wic.bz2 wic.bmap"
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WKS_FILE = "mybsp.wks"
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MACHINE_FEATURES = "usbhost ext2 ext3 vfat alsa"