debug a BCM43224 bwn WiFi in a Lenovo laptop, ALPHA3

I have a Lenovo E420 with the BCM43224.

FreeBSD-13-ALPHA3, locally compiled kernel. (I have built the
requisite WIFI kernel with the PHY_N and DEBUG options) and now, I can
see a bwn0 instance with a blob loaded.

But when I configure it into rc.conf as the wlan0 instance and do
wpa_supplicant.conf it hangs,
and it hangs during boot, if its enabled during boot for this task.

Happy to supply all and any input as directed.

If you want this done in the send-pr I can do that too. (hoping
there's a known fix)

-G