How add Board_RK3568 into platformIO?

---------------- In English ----------------
[Question]
As title shows : How add Board_RK3568 into platformIO? I found that the platformIO board list not have "Board_RK3568", but I wanna add this "Board_RK3568" and use platformIO to build Linux Driver project for learning.
Dear author or warmhearted anyone else, please help me to figure this problem out.
Thanks a lot!
---------------- In Chinese ----------------
【问题】
正如标题说的，怎么把RK3568开发板添加到platformIO里，我想在这个插件里学习Linux内核驱动的知识。
亲爱的作者或者别的热心人，请帮助我解决这个问题。
万分感谢。