I've an TL-WN951N (AR5416+AR5008) using ath9k module running an hostapd and a dhcp for it.
So hostapd starts fine:

$ hostapd wifi.test 
Configuration file: wifi.test
Using interface int1 with hwaddr f4:ec:38:9b:d4:93 and ssid 'test'

hostapd.conf:

interface=int1
driver=nl80211
ssid=test
channel=1

But nobody seems to find it or being able to see it or connect to it by setting BSSID to 'test'.
I'm quite frustrated now, I find 'howto' after 'howto' from people with same chipsets and it always seemed to work out great for them - but not here...
iw list even shows up the AP mode being present at the interface...

Thanks for your help