本文基于 Ubuntu 20.04.4 LTS
1、环境准备
这个没啥好说的，都是搞机的，用之前编译 aosp 的 linux 环境就行，有小伙伴担心会把之前的环境搞崩，
也有用 docker 编译的，我这里就直接在 aosp 环境下搞了，还省事。
安装下面这三东西，是为了下载 Harmony 源码
sudo apt install curl
sudo apt install python3-pip
sudo apt install git-lfs
安装下面这五个东西，是为了解决编译到最后报错(头铁不信的，你可以试试，等最后再安装)
sudo apt install default-jdk
sudo apt install mtd-utils
sudo apt install scons
sudo apt install gcc-arm-none-eabi
sudo apt install gcc-arm-linux-gnueabi
2、安装 repo
务必按照此步骤安装repo。ubuntu默认提供的repo每次启动都会访问googlge服务器，会被墙。
此外20.04下需要root身份执行–否则提示没权限。
curl https://gitee.com/oschina/repo/raw/fork_flow/repo-py3 > /usr/local/bin/repo
chmod a+x /usr/local/bin/repo
pip3 install -i https://repo.huaweicloud.com/repository/pypi/simple requests
3、下载源码
[官网版本更新说明}(https://gitee.com/openharmony/docs/tree/master/zh-cn/release-notes)
目前最新为 4.0 版本，内核基于 5.10，老版本 2.x 1.x 已经停止维护，内核基于 4.19
参考官网下载方式
repo init -u https://gitee.com/openharmony/manifest -b OpenHarmony-4.0-Release --no-repo-verify
repo sync -c
repo forall -c ‘git lfs pull’
注意那个 4.0 之前没有 v，以前的版本是有这个 v 的，不然会初始化失败，还有就是注意检查电脑是否断网了
4、下载编译依赖工具包
源码下载完成后，进入根目录执行 bash build/prebuilts_download.sh
看你网速快慢，我这大概20分钟，下载完成后会多出 openharmony_prebuilts 文件夹
5、编译源码
./build.sh --product-name rk3568 --ccache
第一次编译前面阶段 2W 多个文件，后面阶段 6W 多个文件，整体时间看你电脑性能。
编译中间要是出错看提示就行，少啥就自行安装，比如这种
default-jdk is not installed. please install it.
mtd-utils is not installed. please install it.
scons is not installed. please install it.
gcc-arm-none-eabi is not installed. please install it.
gcc-arm-linux-gnueabi is not installed. please install it.
Missing dependencies, please check!
[OHOS INFO] Set cache size limit to 100.0 GB
[OHOS INFO] generated build prop info to /hom
6、烧写固件(劝你先别烧写)
最终固件路径 out\rk3568\packages\phone\images\
里面文件和普通 rk3568 aosp 项目大差不差，所以烧写方式也是一样的。
打开 rk 烧写工具，选择加载配置，选择 images 里的 config.cfg，把对应的 image
都重新选择替换就行。想要看图的可以去参考这个OpenHarmony 入门
7、内核及驱动移植
没有任何修改编译后的固件肯定是无法在板子上跑起来的，我这里修改了很长时间也没有搞定，这里记录一下一些心得。
主要原因就是内核版本差异太大，无法平行移植，有些小伙伴直接整个 kernel 替换了就成功跑起来了。
3568 有些版本的内核用的是 4.19(我这里就是),而最新的 harmony 都是基于 5.10 了
harmony 内核源码修改路径 out\kernel\src_tmp\linux-5.10
你要是内核版本一致就可以直接替换所有文件，然后稍微修改一下如下编译规则文件
out\kernel\src_tmp\linux-5.10\make-ohos.sh
替换原有 TOYBRICK_DTB 为你自己的，比如 MY3568_DTB, 总共 4 处修改
#!/bin/bash
set -e
SCRIPTPATH=$(dirname $realpath "$0")
export PATH=$(realpath $SCRIPTPATH/../../../../)/prebuilts/clang/ohos/linux-x86_64/llvm/bin/:$(realpath $SCRIPTPATH/../../../../)/prebuilts/develop_tools/pahole/bin/:$PATH
export PRODUCT_PATH=vendor/hihope/rk3568
IMAGE_SIZE=64 # 64M
IMAGE_BLOCKS=4096
ENABLE_LTO_O0=${
3}
CPUs=`sed -n "N;/processor/p" /proc/cpuinfo|wc -l`
MAKE="make LLVM=1 LLVM_IAS=1 CROSS_COMPILE=aarch64-linux-gnu-"
[ "${ENABLE_LTO_O0}" == "enable_lto_O0" ] && MAKE="${MAKE} KCFLAGS=-Wl,--lto-O0"
BUILD_PATH=boot_linux
EXTLINUX_PATH=${
BUILD_PATH}/extlinux
EXTLINUX_CONF=${
EXTLINUX_PATH}/extlinux.conf
# TOYBRICK_DTB=toybrick.dtb
MY3568_DTB=rk3568-evb1-ddr4-v10.dtb
if [ ${
KBUILD_OUTPUT} ]; then
OBJ_PATH=${
KBUILD_OUTPUT}/
fi
ID_MODEL=1
ID_ARCH=2
ID_UART=3
ID_DTB=4
ID_IMAGE=5
ID_CONF=6
model_list=(
"TB-RK3568X0 arm64 0xfe660000 rk3568-toybrick-x0-linux Image rockchip_linux_defconfig"
"TB-RK3568X10 arm64 0xfe660000 rk3568-toybrick-x10-linux Image rockchip_linux_defconfig"
"MYBOARD3568 arm64 0xfe660000 rk3568-evb1-ddr4-v10 Image rockchip_linux_defconfig"
)
function help()
{
echo "Usage: ./make-ohos.sh {BOARD_NAME}"
echo "e.g."
for i in "${model_list[@]}"; do
echo " ./make-ohos.sh $(echo $i | awk '{print $1}')"
done
}
function make_extlinux_conf()
{
dtb_path=$1
uart=$2
image=$3
echo "label rockchip-kernel-5.10" > ${
EXTLINUX_CONF}
echo " kernel /extlinux/${image}" >> ${
EXTLINUX_CONF}
# echo " fdt /extlinux/${TOYBRICK_DTB}" >> ${
EXTLINUX_CONF}
echo " fdt /extlinux/${MY3568_DTB}" >> ${
EXTLINUX_CONF}
cmdline="append earlycon=uart8250,mmio32,${uart} root=PARTUUID=614e0000-0000-4b53-8000-1d28000054a9 rw rootwait rootfstype=ext4"
echo " ${cmdline}" >> ${
EXTLINUX_CONF}
}
function make_kernel_image()
{
arch=$1
conf=$2
dtb=$3
if [ "$GPUDRIVER" == "mesa3d" ]; then
config_base="arch/${arch}/configs/${conf}"
config_frag="../../../../device/soc/rockchip/panfrost.config"
ARCH=${
arch} ./scripts/kconfig/merge_config.sh ${
config_base} ${
config_frag}
else
${
MAKE} ARCH=${
arch} ${
conf}
fi
if [ $? -ne 0 ]; then
echo "FAIL: ${MAKE} ARCH=${arch} ${conf}"
return -1
fi
${
MAKE} ARCH=${
arch} ${
dtb}.img -j${
CPUs}
if [ $? -ne 0 ]; then
echo "FAIL: ${MAKE} ARCH=${arch} ${dtb}.img"
return -2
fi
return 0
}
function make_ext2_image()
{
blocks=${
IMAGE_BLOCKS}
block_size=$((${
IMAGE_SIZE} * 1024 * 1024 / ${
blocks}))
if [ "`uname -m`" == "aarch64" ]; then
echo y | sudo mke2fs -b ${
block_size} -d boot_linux -i 8192 -t ext2 boot_linux.img ${
blocks}
else
genext2fs -B ${
blocks} -b ${
block_size} -d boot_linux -i 8192 -U boot_linux.img
fi
return $?
}
function make_boot_linux()
{
arch=${
!ID_ARCH}
uart=${
!ID_UART}
dtb=${
!ID_DTB}
image=${
!ID_IMAGE}
conf=${
!ID_CONF}
if [ ${
arch} == "arm" ]; then
dtb_path=arch/arm/boot/dts
else
dtb_path=arch/arm64/boot/dts/rockchip
fi
rm -rf ${
BUILD_PATH}
mkdir -p ${
EXTLINUX_PATH}
make_kernel_image ${
arch} ${
conf} ${
dtb}
if [ $? -ne 0 ]; then
exit 1
fi
make_extlinux_conf ${
dtb_path} ${
uart} ${
image}
cp -f ${
OBJ_PATH}arch/${
arch}/boot/${
image} ${
EXTLINUX_PATH}/
# cp -f ${
OBJ_PATH}${
dtb_path}/${
dtb}.dtb ${
EXTLINUX_PATH}/${
TOYBRICK_DTB}
cp -f ${
OBJ_PATH}${
dtb_path}/${
dtb}.dtb ${
EXTLINUX_PATH}/${
MY3568_DTB}
cp -f logo*.bmp ${
BUILD_PATH}/
if [ "enable_ramdisk" != "${ramdisk_flag}" ]; then
make_ext2_image
fi
}
ramdisk_flag=$2
found=0
for i in "${model_list[@]}"; do
if [ "$(echo $i | awk '{print $1}')" == "$1" ]; then
make_boot_linux $i
found=1
fi
done
device\board\hihope\rk3568\kernel\build_kernel.sh
修改内核编译指定使用刚刚的 MYBOARD3568，替换原来 TB-RK3568X0
# eval $MAKE_OHOS_ENV ./make-ohos.sh TB-RK3568X0 $RAMDISK_ARG ${
ENABLE_LTO_O0}
eval $MAKE_OHOS_ENV ./make-ohos.sh MYBOARD3568 $RAMDISK_ARG ${
ENABLE_LTO_O0}
再次执行 ./build.sh --product-name rk3568 --ccache 重新编译
8、编译错误举例
错误1、内核版本差异，dts 文件属性不兼容，出现在 rk3568-dram-default-timing.dtsi 中 260 行，去修改注释即可
[OHOS ERROR] DTC arch/arm64/boot/dts/rockchip/rk3568-evb1-ddr4-v10.dtb
[OHOS ERROR] Error: /home/ubuntu/code/OpenHarmony4.0/out/kernel/src_tmp/linux-5.10/arch/arm64/boot/dts/rockchip/rk3568-dram-default-timing.dtsi:260.27-28 syntax error
[OHOS ERROR] FATAL ERROR: Unable to parse input tree
[OHOS ERROR] make[3]: *** [scripts/Makefile.lib:329: arch/arm64/boot/dts/rockchip/rk3568-evb1-ddr4-v10.dtb] Error 1
[OHOS ERROR] make[2]: *** [/home/ubuntu/code/OpenHarmony4.0/out/kernel/src_tmp/linux-5.10/Makefile:1405: rockchip/rk3568-evb1-ddr4-v10.dtb] Error 2
[OHOS ERROR] make[2]: *** Waiting for unfinished jobs…
[OHOS ERROR] make[1]: *** [arch/arm64/Makefile:208: rk3568-evb1-ddr4-v10.img] Error 2
[OHOS ERROR] make[1]: Leaving directory ‘/home/ubuntu/code/OpenHarmony4.0/out/kernel/OBJ/linux-5.10’
[OHOS ERROR] make: *** [Makefile:185: __sub-make] Error 2
错误2、修改的配置文件有问题
[OHOS ERROR] FAILED: …/kernel/src_tmp/linux-5.10/boot_linux …/kernel/checkpoint/compile_check
[OHOS ERROR] /usr/bin/env …/…/device/board/hihope/rk3568/kernel/build_kernel.sh …/…/kernel/linux/linux-5.10 /home/ubuntu/code/OpenHarmony4.0/out/rk3568/packages/phone/images /home/ubuntu/code/OpenHarmony4.0/device/board/hihope/rk3568 vendor/hihope/rk3568 /home/ubuntu/code/OpenHarmony4.0 rockchip rk3568 hihope root default disable_lto_O0
9、开机 logo 替换
device\board\hihope\rk3568\kernel\logo.bmp
device\board\hihope\rk3568\kernel\logo_kernel.bmp
10、一些常见路径
applications\standard 系统核心应用，包括日历、电话、相机、联系人、Setting、SystemUI 等
out\kernel\src_tmp\linux-5.10 最终编译内核源码路径
out\kernel\OBJ\linux-5.10 内核源码编译 obj 路径
kernel\linux\linux-5.10 SDK自带原生 kernel 路径
device\board\hihope\rk3568 编译脚本路径
openharmony kernel 代码构成如下：
①、SDK 自带原生 kernel（kernel\linux\linux-5.10\）
②、openharmony HDF驱动补丁包 hdf.patch（kernel\linux\patches\linux-5.10\rk3568_patch\）
③、方案商需求的内核补丁包 kernel.patch（kernel\linux\patches\linux-5.10\rk3568_patch\）
由1中kernel加上2、3中的patch，组合成最终的kernel代码（out\kernel\src_tmp\linux-5.10）
该工作由 device\board\hihope\rk3568\kernel\build_kernel.sh完成
脚本每次执行会时开头都会删除 out\kernel\src_tmp\linux-5.10 目录，重新组合生成。