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1、首先下载repo
mkdir ~/bin (this step may not be needed if the bin folder already exists)
curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
因为国内防火墙的原因，把repo 的url 地址改为国内
REPO_URL = 'https://mirrors.tuna.tsinghua.edu.cn/git/git-repo'
2、再根目录下新建bin文件加。把repo 文件放入bin下，执行下面的命令
mkdir ~/bin
cp repo ~/bin
chmod a+x ~/bin/repo
export PATH=~/bin:$PATH
3、如果第一次下载使用git ，需要配置git 相关的环境变量
git config --global user.name "Your Name"
git config --global user.email "Your Email"
git config --list
4、下载源码
mkdir imx-yocto-bsp
cd imx-yocto-bsp
repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-sumo -m imx-4.14.98-2.0.0_ga.xml
repo sync
下载和同步时间比较长，
error: command ‘git://git.freescale.com/imx/fsl-arm-yocto-bsp.git’ requires repo to be installed first.
Use “repo init” to install it here.
需要替换 /etc/hosts
就可以正常下载了