之前为了嵌入式学习和开发，自己摸索着应用虚拟机搭建ubuntu系统。载使用中存在诸多不便。很幸运，WIN10系统内嵌了ubuntu系统。所以，立刻抽出时间搭建WSL系统，在安装WSL系统过程中，很快也很傻瓜，这里就不赘述了。
重点是，在这个WSL系统下怎么搭建嵌入式开发环境。下面具体介绍，并对使用过程中发现的问题解决方法也会简单介绍。
一、打开WSL终端
在WSL系统安装完成后，打开WSL有几种方式：
二、更改镜像源
1、打开镜像源列表文件 /etc/apt/sources.list，替换为：
# deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://mirrors.aliyun.com/ubuntu/ focal universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://mirrors.aliyun.com/ubuntu/ focal multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb-src http://us.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu focal partner
# deb-src http://archive.canonical.com/ubuntu focal partner
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://mirrors.aliyun.com/ubuntu/ focal-security universe
# deb-src http://security.ubuntu.com/ubuntu focal-security universe
deb http://mirrors.aliyun.com/ubuntu/ focal-security multiverse
# deb-src http://security.ubuntu.com/ubuntu focal-security multiverse
# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.
deb http://security.ubuntu.com/ubuntu/ focal-security main multiverse universe restricted
deb http://cz.archive.ubuntu.com/ubuntu trusty main
# deb-src http://cz.archive.ubuntu.com/ubuntu trusty main
2、执行：sudo apt-get update
三、安装交叉编译器
需要下 4.9版本的编译器，下载地址为：
https://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/arm-linux-gnueabihf/
安装下载工具：sudo apt-get install axel
使用下载工具：axel -n 50 https://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/arm-linux-gnueabihf/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf.tar.xz
1、下载后解压：sudo tar -vxf gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf.tar.xz
2、创建文件夹：sudo mkdir /usr/local/arm
3、拷贝到创建的文件夹：sudo cp gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf.tar.xz /usr/local/arm/ -f
4\、在/etc/profile和~/.bashrc最后一行添加：
export PATH=$PATH:/usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/lib
在/etc/sudoers的参数secure_path添加：usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin
5、执行命令：source ~/.bashrc
四、安装依赖
1、安装64位兼容库
如果ubuntu系统是64位的，而交叉编译器是32位的，因此需要安装兼容64位的库：lib32ncurses5 lib32z1 lib32bz2-1.0（旧版本ubuntu替换安装ia32-libs）
2、32位C++6标准库
lib32stdc++6
3、编译内核缺少的依赖包
解压缩依赖包： lzop
SSL证书依赖：libssl-dev
软件依赖包： dpkg-dev
命令lex依赖包： flex
执行make menuconfig时，需要curses字符终端处理，缺少依赖包： libncurses5-dev
语法分析器依赖包：bison
五、安装VSCODE并安装相关插件
1、默认安装VSCODE
官网地址下载：https://code.visualstudio.com/
2、安装扩展插件
六、VSCODE打开SWL文件夹
在ubuntu 命令终端，cd进入要打开的文件夹，然后执行命令(一定要复制哦)：code .
然后VSCODE就会打开文件夹。
在VSCODE菜单-》终端》新终端，打开bash终端，并直接进入当前文件夹路径：
注意：当VSCODE无权限保存linux文件，通过命令ls -al查看用户是root，而VSCODE连接的用户为普通用户。可以通过chown修改文件所属用户：
sudo chown -R username filedir
chown还具有更改用户组命令：
sudo chown nowusergroup:newusergourp filedir