Sorry about that, you need proxy server
If you cannot download the repo from google, please try this one:
Git Repo | 镜像站使用帮助 | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror
You can refer to https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/Compiling-L5-4-3-1-0-0-BSP-On-Ubuntu-180...