BTW, I've committed a preliminary AP6212 integration for BPiM2+Ultra DTS.
But, to my surprise, BPiM2+Ultra WL-WAKEUP is not attached to some GPIO of the R40, so I've left it commented in the DTS.
This is may one of the reason with I wasn't able to make it work : the wlan0 appears but doesn't receive it DHCP response.
Or this is related to the fact that it is not a "A" version, since I'm now getting the same issue with plain BPiM2+, although it worked last week.