The linux btrtl driver lists a whole slew of binary firmware blobs, but maybe they also produce a few modules which do not require them. Can you give me an exa

The linux btrtl driver lists a whole slew of binary firmware blobs, but maybe they also produce a few modules which do not require them. Can you give me an example of a realtek module which does not require any? I know that I've used a realtek USB <-> Ethernet adapter without firmware. Unfortunately, it did not work reliably unless firmware was loaded.