imx8mm yocto_bsp 编译
在实际的项目中，根据使用的具体版本来进行下载。
其中-b 选择分支
https://source.codeaurora.org/external/imx/imx-manifest/tree/README?h=imx-linux-zeus
mkdir imx-yocto-bsp
sudo chmod 777 imx-yocto-bsp
cd imx-yocto-bsp
repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-sumo -m imx-4.14.98-2.0.0_ga.xml
repo sync
fsl-setup-release.sh脚本会对参数如下的三个参数进行解析
DISTRO=fsl-imx-wayland
MACHINE=imx8mmevk source
-b imx8mmevk_wayland
DISTRO=fsl-imx-wayland MACHINE=imx8mmevk source fsl-setup-release.sh -b imx8mmevk_wayland
这个命令使用sources文件夹，
fsl-setup-release.sh以及setup-environment生成imx8mmevk_wayland目录以及子目local/local.conf文件。
如果想在local.conf中增加内容，
比如增加CORE_IMAGE_EXTRA_INSTALL += "dhcp-server iperf2"，那么可以在fsl-setup-release.sh文件中
echo BSPDIR=$BSPDIR之前增加以下命令：
echo "CORE_IMAGE_EXTRA_INSTALL += \"dhcp-server iperf2\"" >> $BUILD_DIR/conf/local.conf
然后执行DISTRO=fsl-imx-wayland MACHINE=imx8mmevk source fsl-setup-release.sh -b imx8mmevk_wayland，就会更新local.conf文件
bitbake fsl-image-validation-imx 编译基于wayland 的支持GUI 的测试镜像
在下面的链接中下载文档，主要参考i.MX_Yocto_Project_User's_Guide.pdfi.MX Developer Resources | NXP Semiconductors
https://www.nxp.com/design/i-mx-developer-resources:IMXSW_HOME
下面的链接中也有对imx_linux_zeus 这个分子进行介绍说明如何编译
README - imx-manifest - i.MX Release Manifesthttps://source.codeaurora.org/external/imx/imx-manifest/tree/README?h=imx-linux-zeus
可以在下面的链接中搜索想要编译到文件系统中的bb recipes，其中已tcpdump为例
OpenEmbedded Layer Index - recipeshttp://layers.openembedded.org/layerindex/branch/master/recipes/?q=tcpdump
2：内核编译(Image-imx8mmevk.bin)
注意看其中的linux-imx_4.14.98.bb
bitbake -v -c clean linux-imx
bitbake -v linux-imx
对应编译日志如下：由此可以知道上面bb中的mkdir -p ${B} B只的是build
$<50>+ do_copy_defconfig
+ install -d /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/linux-imx/4.14.98-r0/build
$<50>+ [ no = yes ]
+ mkdir -p /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/linux-imx/4.14.98-r0/build
$<50>+ cp /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/linux-imx/4.14.98-r0/git/arch/arm64/configs/defconfig /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/linux-imx/4.14.98-r0/build/.config
$<50>+ cp /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/linux-imx/4.14.98-r0/git/arch/arm64/configs/defconfig /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/linux-imx/4.14.98-r0/build/../defconfig
编译完成之后，有如何生成的文件
如果要能烧写到imx中还需要额外的文件 先将系统中内核挂载出来。
root@imx8mmevk:~/kernel# cat /proc/partitions
major minor #blocks name
31 0 32768 mtdblock0
179 0 7761920 mmcblk1
179 1 65536 mmcblk1p1
179 2 1613824 mmcblk1p2
179 32 15388672 mmcblk2
179 33 4096 mmcblk2p1
179 34 4096 mmcblk2p2
179 35 65536 mmcblk2p3
179 36 65536 mmcblk2p4
179 37 65536 mmcblk2p5
179 38 65536 mmcblk2p6
179 39 4096 mmcblk2p7
179 40 16384 mmcblk2p8
179 41 1024 mmcblk2p9
179 42 4194304 mmcblk2p10
179 43 9127936 mmcblk2p11
179 44 1024 mmcblk2p12
179 45 1024 mmcblk2p13
179 46 1024 mmcblk2p14
179 128 4096 mmcblk2rpmb
179 96 4096 mmcblk2boot1
179 64 4096 mmcblk2boot0
root@imx8mmevk:~/kernel# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 1.5G 1.2G 146M 90% /
devtmpfs 659M 4.0K 659M 1% /dev
tmpfs 979M 0 979M 0% /dev/shm
tmpfs 979M 8.5M 971M 1% /run
tmpfs 979M 0 979M 0% /sys/fs/cgroup
tmpfs 979M 0 979M 0% /tmp
tmpfs 979M 248K 979M 1% /var/volatile
/dev/mmcblk2p8 12M 176K 11M 2% /run/media/mmcblk2p8
/dev/mmcblk1p1 64M 23M 42M 36% /home/root/kernel
tmpfs 196M 0 196M 0% /run/user/0
root@imx8mmevk:~/kernel# ls -alh //home/root/kernel
total 23M
drwxrwx--- 3 root disk 16K Jan 1 1970 .
drwx------ 5 root root 4.0K Sep 19 23:42 ..
-rwxrwx--- 1 root disk 23M Mar 11 2022 Image
drwxrwx--- 2 root disk 2.0K Mar 11 2022 System Volume Information
-rwxrwx--- 1 root disk 44K Mar 11 2022 fsl-imx8mm-ddr4-evk-rm67191.dtb
-rwxrwx--- 1 root disk 44K Mar 11 2022 fsl-imx8mm-ddr4-evk.dtb
-rwxrwx--- 1 root disk 44K Mar 11 2022 fsl-imx8mm-ddr4-qca9377-evk.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-ak4497.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-ak5558.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-audio-tdm.dtb
-rwxrwx--- 1 root disk 22K Mar 11 2022 fsl-imx8mm-evk-inmate.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-m4.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-revb-rm67191.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-revb.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-rm67191.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk-root.dtb
-rwxrwx--- 1 root disk 43K Mar 11 2022 fsl-imx8mm-evk.dtb
-rwxrwx--- 1 root disk 6.2K Mar 11 2022 imx8mm_m4_TCM_hello_world.bin
-rwxrwx--- 1 root disk 17K Mar 11 2022 imx8mm_m4_TCM_rpmsg_lite_pingpong_rtos_linux_remote.bin
-rwxrwx--- 1 root disk 17K Mar 11 2022 imx8mm_m4_TCM_rpmsg_lite_str_echo_rtos.bin
-rwxrwx--- 1 root disk 40K Mar 11 2022 imx8mm_m4_TCM_sai_low_power_audio.bin
root@imx8mmevk:~/kernel# 在执行bitbake -c compile -v fsl-image-validation-imx 得日志过程中
其中image_types_fsl.bbclass包含升级可升级的boot.img的过程
linshubin@fcrdsw-13:~/origin_imx-yocto-bsp/sources$ grep -srn "_generate_boot_image" ./
./meta-fsl-bsp-release/imx/meta-bsp/classes/image_types_fsl.bbclass:123:_generate_boot_image() {
./meta-fsl-bsp-release/imx/meta-bsp/classes/image_types_fsl.bbclass:259: _generate_boot_image 1
./meta-fsl-bsp-release/imx/meta-bsp/classes/image_types_fsl.bbclass:337: _generate_boot_image 2
linshubin@fcrdsw-13:~/origin_imx-yocto-bsp/sources$
linshubin@fcrdsw-13:~/origin_imx-yocto-bsp/sources$ grep -srn "BOOT_SCRIPTS" ./
./meta-fsl-bsp-release/imx/meta-bsp/classes/image_types_fsl.bbclass:143: for item in ${BOOT_SCRIPTS}; do
linshubin@fcrdsw-13:~/origin_imx-yocto-bsp/sources$ 
其烧写文件为：boot.img 由下面的个文件组成
3: 文件系统
dd if=/dev/zero of=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.ext4 seek=1400832 count=0 bs=1024
先生成空文件fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.ext4
之后再使用mkfs.ext4
mkfs.ext4 -F -i 4096 /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.ext4 -d /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/rootfs
r
分区信息如下：
4：BootLoader
bitbake imx-boot 制作启动文件，其中包含了:
bitbake u-boot-imx 这个才是我们平时所谓的u-boot.bin 及u-boot-spl.bin
im8mm的boot 有多个文件组合而成的，并非仅仅只有一个传统的uboot文件
SD卡Image
有上面整个打包过程可以知道：SDimage有三部分组成
1：imx-boot-imx8mmevk-sd.bin 这个就是flash.bin
2：boot.img
3：fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.ext4
dd if=/dev/zero of=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard bs=1 count=0 seek=1518338048
parted -s /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard mklabel msdos
parted -s /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard unit KiB mkpart primary fat32 8192 73728
parted -s /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard unit KiB mkpart primary 73728 1474560
parted /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard print
Disk /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard: 1518MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 8389kB 75.5MB 67.1MB primary lba
2 75.5MB 1510MB 1434MB primary
dd if=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/deploy/images/imx8mmevk/imx-boot-imx8mmevk-sd.bin of=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard conv=notrunc seek=33 bs=1K
dd if=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/boot.img of=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard conv=notrunc,fsync seek=1 bs=8388608
dd if=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.ext4 of=/home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard conv=notrunc,fsync seek=1 bs=75497472
pbzip2 -f -k fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard
rm fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard
fsl-image-validation-imx-1.0-r0 do_image_sdcard: Creating symlink: /home/linshubin/origin_imx-yocto-bsp/imx8mmevk_wayland/tmp/work/imx8mmevk-poky-linux/fsl-image-validation-imx/1.0-r0/deploy-fsl-image-validation-imx-image-complete/fsl-image-validation-imx-imx8mmevk.sdcard.bz2 -> fsl-image-validation-imx-imx8mmevk-20220329061930.rootfs.sdcard.bz2