Are you seeing lots of dropped packets on wifi or?? Any tips you could give on how to confirm if wifi is working as it should or not? wavemon?
For me, I wanted to thank you for linking the u-boot updates, they have booting from sdcard working again (like you I am booting Manjaro from SD for some comparisons).
I have 2 main issues with armbian on the pbp: waking from suspend gives a black screen, need to force down the machine and restart, and no sound. I tried some with alsamixer but haven't succeeded on getting anything out of the speakers or headphone jack. Not sure if there are some additional patches I need for these issues? Both seem to now be resolved on Manjaro, but a few months ago suspend wasn't working there.... so maybe things will trickle into Armbian.
Thanks again for the attention to the pbp, I think it is strategically important for a good Armbian port for it as, in my opinion, it is the best Ubuntu base option around.
UPDATE: I used armbian-config to switch to the most recent 4.4 legacy kernel and all issues seem resolved: wake from suspend works (red led comes on when suspended), sound works, and video acceleration in youtube works (previously was very "stuttery" but now seems smooth).
So I am happy staying at this 4.4 kernel as everything seems quite usable. Not sure if others are running the newer 5.8.6 or not and if they have any of the above issues with it?