Flippy固件内核的构建

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获取编译源码

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git clone --depth=1 https://github.com/unifreq/linux-5.10.y-rk35xx
cd linux-5.10.y-rk35xx

wget -O .config https://raw.githubusercontent.com/unifreq/arm64-kernel-configs/main/config-5.10.160-rk3588-flippy-2407a
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j$(nproc) LOCALVERSION=
# 添加 LOCALVERSION= 可解决内核版本带+ 的问题，查看内核版本号：cat include/config/kernel.release

# 开始安装内核到指定位置，最好切换到root用户再安装模块，否则可能模块权限将混乱
KERNEL_PATH=/home/leux/kernel
sudo mkdir -p ${KERNEL_PATH}/boot/			# INSTALL_PATH不存在会报错
sudo make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- install INSTALL_PATH=${KERNEL_PATH}/boot/
sudo make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- modules_install INSTALL_MOD_PATH=${KERNEL_PATH}/
sudo make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- dtbs_install INSTALL_DTBS_PATH=${KERNEL_PATH}/boot/dtb-5.10.160-leux

压缩打包内核

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# 设置内核的存放路径以及版本号
KERNEL_PATH=/home/leux/kernel
LOC_VERSION=5.10.160-leux

# 先将boot目录和modules目录拷到其他arm64主机上制作映像文件，直接在X86上制作会导致映像内可执行文件是x86的而引导失败
# 也可以通过binfmt和qemu通过chroot在x86下制作，然后将生成的initrd.img-xxx和uInitrd-xxx拷回本地boot目录中
sudo cp -r ${KERNEL_PATH}/boot /boot/
sudo cp -r ${KERNEL_PATH}/lib/modules/${LOC_VERSION} /lib/modules/
sudo mkinitramfs -c xz -o /boot/initrd.img-${LOC_VERSION} ${LOC_VERSION}
sudo mkimage -A arm64 -T ramdisk -C none -n uInitrd -d /boot/initrd.img-${LOC_VERSION} /boot/uInitrd-${LOC_VERSION}

# 打包内核镜像
cd ${KERNEL_PATH}/boot && \
tar --exclude="dtb-${LOC_VERSION}" -czf ${KERNEL_PATH}/boot-${LOC_VERSION}.tar.gz *

# 打包设备树包
cd ${KERNEL_PATH}/boot/dtb-${LOC_VERSION}/rockchip && \
tar -czf ${KERNEL_PATH}/dtb-rockchip-${LOC_VERSION}.tar.gz .

# 打包内核模块
cd ${KERNEL_PATH}/lib/modules && \
tar -czf ${KERNEL_PATH}/modules-${LOC_VERSION}.tar.gz *


# 内核头文件的打包，最好刚克隆下来或者清理后再打包
KERNEL_SOURCE=/home/leux/linux-5.10.y-rk35xx
cd ${KERNEL_PATH}/usr/
cp ${KERNEL_SOURCE}/.config ${KERNEL_PATH}/usr/
cp ${KERNEL_SOURCE}/Makefile ${KERNEL_PATH}/usr/
cp ${KERNEL_SOURCE}/Module.symvers ${KERNEL_PATH}/usr/

cp -r ${KERNEL_SOURCE}/include/ ${KERNEL_PATH}/usr/include/
cp -r ${KERNEL_SOURCE}/scripts/ ${KERNEL_PATH}/usr/scripts/

mkdir -p ${KERNEL_PATH}/usr/arch/arm64/kvm/hyp/include/
cp -r ${KERNEL_SOURCE}/arch/arm64/Makefile ${KERNEL_PATH}/usr/arch/arm64/
cp -r ${KERNEL_SOURCE}/arch/arm64/Makefile.postlink ${KERNEL_PATH}/usr/arch/arm64/
cp -r ${KERNEL_SOURCE}/arch/arm64/include/ ${KERNEL_PATH}/usr/arch/arm64/include/
cp -r ${KERNEL_SOURCE}/arch/arm64/kvm/hyp/include/* ${KERNEL_PATH}/usr/arch/arm64/kvm/hyp/include/

cd ${KERNEL_PATH}/usr && \
tar -czf ${KERNEL_PATH}/header-${LOC_VERSION}.tar.gz .

双系统的切换

  1. Flippy固件的分区布局
分区 路径 大 小 挂 载 点
u-boot 或者是分区表 4MB~16MB
boot /dev/mmcblk0p1 128MB~512MB /boot
主rootfs /dev/mmcblk0p2 720MB~1GB /
副rootfs /dev/mmcblk0p3 720MB~1GB /mnt/xx
数据分区 /dev/mmcblk0p4 >=5GB /mnt/yy
一半内存 /dev/shm 内存的一半 /tmp

注：每次在线升级后，副rootfs变成主rootfs，主rootfs变成副rootfs，个人数据、下载数据、DOCKER数据可放数据分区

  1. 了解完分区布局后，我们想让主rootfs存放LEDE系统，而副rootfs存放Debian系统，通过更改/boot/armbianEnv.txt中UUID的值来切换
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# 如下配置为将默认启动LEDE改为默认启动Debian，UUID请调整为你设备的
OPENWRT_UUID=18d0ca60-ff01-47e6-bb64-10b94c9df2c9	# 主ROOTFS的UUID，用来存放OPENWRT系统
ARMBIAN_UUID=3165642e-87be-4db8-837c-262c96b31020	# 副ROOTFS的UUID，用来存放 Debian系统
IMG_PATH=/mnt/mmcblk1p4/rootfs.img			# Debian RootFS镜像文件（来自Armbian）
TEMP_PATH=/mnt/rootfs					# Debian 镜像文件挂载点
ROOT_PATH=/mnt/mmcblk0p4				# Debian RootFS 存放处
mkdir -p "${TEMP_PATH}" "${ROOT_PATH}"

losetup -f -P "${IMG_PATH}"				# 挂载镜像文件
mount -t "ext4" "/dev/loop0" "${TEMP_PATH}"
cp -r ${TEMP_PATH}/* ${ROOT_PATH}/			# 拷贝Debian RootFS到副rootfs

cp /etc/fstab ${ROOT_PATH}/etc/fstab			# 更改挂载点来切换使用副rootfs
sed -i "s/${OPENWRT_UUID}/${ARMBIAN_UUID}/" ${ROOT_PATH}/etc/fstab
sed -i "s/${OPENWRT_UUID}/${ARMBIAN_UUID}/" /boot/armbianEnv.txt

losetup -D						# 卸载Debian RootFS镜像文件
umount /dev/loop0

rm -rf ${ROOT_PATH}/usr/lib/firmware/*			# 去除Armbian的固件和模块并替换为LEDE的
cp -r /lib/firmware/* ${ROOT_PATH}/usr/lib/firmware/
rm -rf ${ROOT_PATH}/usr/lib/modules/*
cp -r /lib/modules/* ${ROOT_PATH}/lib/modules/

# 替换内核进入Debian系统后执行如下命令可保持内核不更新
sudo apt-mark hold linux-image-legacy-rk35xx linux-dtb-legacy-rk35xx \
linux-u-boot-hinlink-ht2-legacy armbian-bsp-cli-hinlink-ht2-legacy
sudo apt-mark unhold


# 双系统切换之更换到OPENWRT
sed -i "s/${ARMBIAN_UUID}/${OPENWRT_UUID}/" /boot/armbianEnv.txt

# 双系统切换之更换到Debian
sed -i "s/${OPENWRT_UUID}/${ARMBIAN_UUID}/" /boot/armbianEnv.txt