vexpress a9的
https://github.com/QQxiaoming/vexpress_v2p_ca9
http://115.28.165.193/down/arm/ve/DUI0448G_v2p_ca9_trm.pdf
https://blog.csdn.net/jingshaoyou/article/details/105489943 里的
https://www.cnblogs.com/kele-dad/category/1009200.html
https://github.com/QQxiaoming/vexpress_v2p_ca9
http://115.28.165.193/down/arm/ve/DUI0448G_v2p_ca9_trm.pdf
https://blog.csdn.net/jingshaoyou/article/details/105489943 里的
https://www.cnblogs.com/kele-dad/category/1009200.html