Changelog of features / drivers removed from kernel?

Apologies if this comes off as a lazy question, but after a fair bit of searching I've been unable to find a changelog indicating which device drivers / features were dropped from various versions of the kernel. Does such a changelog exist? I'm specifically trying to narrow down why the PCI devices on a server I have work with 5.8 and don't work with 5.9+. The server is circa 2014, so I suppose there's an off chance support for some component got dropped. Thanks in advance, Evan -- Evan Mesterhazy etm2131@columbia.edu