How Much Non-Free Software Does The PineBook Pro Use?

[Arwen]

Here is a list of non-free software that I know of:

• TrackPad firmware
  
• Keyboard firmware, (but their is a modified version that is more open & generally available)
  
• WiFi firmware
  
• ATF, ARM Trusted Firmware, (their is an open sourced version available)
  
• Video drivers, (their is an open source version available with reduced functionality at present)
  

As you can see, it's mostly low level software or firmware. All the main software is both open source and free.

Their could be other items that I missed, (I don't pretend to be perfect :-).

The ATF is used early on, by U-Boot. Unless you make an effort, your U-Boot, (and what ATF it uses), is selected by the Linux distro you load.
I have heard that their are multiple versions of the WiFi firmware / driver, but I have not bothered to read further on that subject.
Someone had started to reverse engineer the TrackPad firmware, however that appears to be abandoned at present. Again, I am not following this subject.