Sunpuls github for Linux kernel 4.19 and 5.4 source code, it support BPI-F2S and BPI-F2P
wiki page documents:
https://sunplus-tibbo.atlassian.net/wiki/spaces/doc/overview
yocto linux github ,support by tibbotech
Banana Pi BPI-F2S/F2P BPS code with kernel 5.4.35 :