从零开始打造 OpenSTLinux 6.6 Yocto 系统（基于STM32CubeMX）（九）

设备树移植

1. 和uboot设备树修改的内容同步到kernel
2. 将设备树stm32mp157d-stm32mp157daa1-mx.dts复制到内核源码目录下

源码修改及编译

1. 修改arch/arm/boot/dts/st/Makefile，新增设备树编译

   		stm32mp157f-ev1-m4-examples.dtb \
   		stm32mp157d-stm32mp157daa1-mx.dtb

2. 修改网络驱动 - 参考正点原子

   【正点原子】STM32MP157开发板（A盘）-基础资料\01、程序源码\08、模块驱动源码\01、YT8511驱动源码\linux内核下修改方法

3. 编译kernel - 参考README.HOW_TO.txt

   source ~/sdk6.6
   export OUTPUT_BUILD_DIR=$PWD/../build
   mkdir -p ${OUTPUT_BUILD_DIR}
   make O="${OUTPUT_BUILD_DIR}" defconfig fragment*.config
   for f in `ls -1 ../fragment*.config`; do scripts/kconfig/merge_config.sh -m -r -O ${OUTPUT_BUILD_DIR} ${OUTPUT_BUILD_DIR}/.config $f; done
   (yes '' || true) | make oldconfig O="${OUTPUT_BUILD_DIR}"
   
   
   [ "${ARCH}" = "arm" ] && imgtarget="uImage" || imgtarget="Image.gz"
   echo $imgtarget
   export IMAGE_KERNEL=${imgtarget}
   make ${IMAGE_KERNEL} vmlinux dtbs LOADADDR=0xC2000040 O="${OUTPUT_BUILD_DIR}"
   make modules O="${OUTPUT_BUILD_DIR}"
   make INSTALL_MOD_PATH="${OUTPUT_BUILD_DIR}/install_artifact" modules_install O="${OUTPUT_BUILD_DIR}"
   mkdir -p ${OUTPUT_BUILD_DIR}/install_artifact/boot/
   cp ${OUTPUT_BUILD_DIR}/arch/${ARCH}/boot/${IMAGE_KERNEL} ${OUTPUT_BUILD_DIR}/install_artifact/boot/
   find ${OUTPUT_BUILD_DIR}/arch/${ARCH}/boot/dts/ -name 'st*.dtb' -exec cp '{}' ${OUTPUT_BUILD_DIR}/install_artifact/boot/ \;
   
   make dtbs O="${OUTPUT_BUILD_DIR}"
   find ${OUTPUT_BUILD_DIR}/arch/${ARCH}/boot/dts/ -name 'st*.dtb' -exec cp '{}' ${OUTPUT_BUILD_DIR}/install_artifact/boot/ \;
   cp /home/niuke/STM32/STM32MP1/develop/linux-stm32mp-6.6.48-stm32mp-r1-r0/linux-6.6.48/../build/arch/arm/boot/dts/st/stm32mp157d-stm32mp157daa1-mx.dtb ~/tftpboot/

uboot网络配置

setenv ipaddr 192.168.156.11 
setenv ethaddr b8:ae:1d:01:01:00 
setenv gatewayip 192.168.156.1 
setenv netmask 255.255.255.0 
setenv serverip 192.168.156.10 
saveenv

设置tftp启动

setenv bootcmd 'tftp c2000000 uImage;tftp c4000000 stm32mp157d-stm32mp157daa1-mx.dtb;bootm c2000000 - c4000000'
saveenv
reset

制作ext4文件

dd if=/dev/zero of=bootfs.ext4 bs=1M count=16
mkfs.ext4 -L bootfs bootfs.ext4
sudo mount bootfs.ext4 /mnt/bootfs/
sudo cp uImage stm32mp157d-stm32mp157daa1-mx.dtb /mnt/bootfs/
sudo umount /mnt/bootfs

下载到板子上验证

1. 新增flash.tsv

   #Opt	Id	Name	Type	Device	Offset	Binary
   -	0x01	fsbl-boot	Binary	none	0x0	new/tf-a-stm32mp157d-stm32mp157daa1-mx-optee-programmer-usb.stm32
   -	0x03	fip-boot	Binary	none	0x0	new/fip-stm32mp157d-stm32mp157daa1-mx-optee-programmer-usb.bin
   P	0x04	fsbl1	Binary	mmc0	boot1	new/tf-a-stm32mp157d-stm32mp157daa1-mx-optee-emmc.stm32
   P	0x05	fsbl2	Binary	mmc0	boot2	new/tf-a-stm32mp157d-stm32mp157daa1-mx-optee-emmc.stm32
   PD	0x06	metadata1	FWU_MDATA	mmc0	0x00080000	new/metadata.bin
   PD	0x07	metadata2	FWU_MDATA	mmc0	0x00100000	new/metadata.bin
   P	0x08	fip-a	FIP	mmc0	0x00180000	new/fip-stm32mp157d-stm32mp157daa1-mx-optee-emmc.bin
   PED	0x09	fip-b	FIP	mmc0	0x00580000	none
   PED	0x0A	u-boot-env	ENV	mmc0	0x00980000	none

思考

1. 如何解决问题missing clock-frequency ？

   [ 0.004619] /cpus/cpu@0 missing clock-frequency property
   [ 0.004716] /cpus/cpu@1 missing clock-frequency property

2. 以下问题为什么出现？

   [ 4.073306] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---