error trying to enable BBGW wifi on newest build

I’m using this image on my BBGW: https://rcn-ee.com/rootfs/bb.org/testing/2016-08-28/seeed-iot/BBGW-blank-debian-8.5-seeed-iot-armhf-2016-08-28-4gb.img.xz

Initial image write seems to work. Then I login with the debian username, and try to enable wifi, but I’m getting this:

$ sudo connmanctl enable wifi

Error wifi: Method “SetProperty” with signature “sv” on interface “net.connman.Technology” doesn’t exist

Google searches for this error seems to indicate that a driver does not exist (or wasn’t loaded) for the wifi hardware.

The only mention of the wl device I see in dmesg is the following:

[ 21.097679] input: ti-tsc as /devices/platform/ocp/44e0d000.tscadc/TI-am335x-tsc/input/input4
[ 22.655200] wl1271_sdio: probe of mmc2:0001:2 failed with error -16
[ 22.965578] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20

Anyone know what this could be or how to fix it?

Stéphane