I have done some further research on this issue and have determined that
it is both an upstream and non-free issue, so it doesn’t belong here.
For posterity, however, I have found that:
- The WiFi card _is_ the “ethernet” device seen in ‘ip address’.
- The brcmfmac driver searches for the following missing files in the
firmware directory:
1. brcmfmac43602-pcie.txt
This file can be found in the attachments of this thread [1],
where others encountering this issue made it via
reverse-engineering.
2, brcmfmac43602-pcie.Apple Inc-<product name>.txt
3. brcmfmac43602-pcie.Apple Inc-<product name>.bin
Where <product name> is in my case ‘MacBookPro-12,1’.
These files are indicated to be searched for and missing by dmesg
[2], but I have no idea where these would be found. I’d guess that
some more “user-friendly” distros would ship them, so I’ll start
the search with their install images. Again, if the .txt file’s
licensing is OK, it should be in the libre kernel, I think?
I’m going to try to write a package that includes these missing files.
If anyone has any recommendations of relevant mailing lists or resources
for this problem, I would be very appreciative.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=193121
[2] https://askubuntu.com/questions/1217400/how-can-i-solve-problems-\
from-dual-boot-on-macbookproubuntu-wifi
