前言：根据ubuntu2004的chroot开发环境的内容我们已经具备ubuntu2004的chroot环境了，基于此我们从零搭建OH的开发环境步骤如下

一、chroot脚本

#!/bin/bash
 
CHROOT_DIR=/data/squashfs-root/
 
# 挂载dev/proc/sys
! mountpoint -q  /${CHROOT_DIR}/dev/ && mount -o bind /dev /${CHROOT_DIR}/dev/
! mountpoint -q  /${CHROOT_DIR}/dev/pts && mount -t devpts devpts /${CHROOT_DIR}/dev/pts
! mountpoint -q  /${CHROOT_DIR}/proc/ && mount -t proc proc /${CHROOT_DIR}/proc/
! mountpoint -q  /${CHROOT_DIR}/sys/ && mount -t sysfs sys /${CHROOT_DIR}/sys/

根据此脚本可以正常进入2004的chroot环境

二、安装包

根据OH官网的文档，需要安装如下包

apt install default-jdk genext2fs mtd-utils scons gcc-arm-none-eabi gcc-arm-linux-gnueabi ccache
apt install libxinerama-dev libxcursor-dev libxrandr-dev libxi-dev curl python3-pip
apt-get install git git-lfs

三、配置环境

配置repo，拉取代码，安装hb脚本如下

mkdir ~/bin
curl https://gitee.com/oschina/repo/raw/fork_flow/repo-py3 -o ~/bin/repo 
chmod a+x ~/bin/repo
pip3 install -i https://repo.huaweicloud.com/repository/pypi/simple requests
vim ~/.bashrc # 编辑环境变量
export PATH=~/bin:$PATH # 在环境变量的最后添加一行repo路径信息
source ~/.bashrc # 应用环境变量
repo init -u git@gitee.com:openharmony/manifest.git -b master --no-repo-verify
repo sync -c
repo forall -c 'git lfs pull'
python3 -m pip install --user build/hb
export PATH=~/.local/bin:$PATH
build/prebuilts_download.sh

3.1 获取标准系统Openharmony4.0代码

repo init -u https://gitee.com/openharmony/manifest -b OpenHarmony-4.0-Release  --no-repo-verify -g ohos:standard
repo sync -c
repo forall -c 'git lfs pull'

四、编译代码

./build.sh --product-name rk3568 --ccache --no-prebuilt-sdk

4.1 编译rk3588

build/prebuilts_download.sh
./build.sh --product-name dayu210 --ccache

五、成果

out/rk3568/packages/phone/images/