I'm trying to get the wifi PCIe NIC (based on Atheros 9287) working on my setup. Obviously, it's not working so I'm hoping you can help me out. 
After reading various discussions and the handbook and FreeBSD Diary, I made:
1. some changes to rc.conf and added some entries
2. created a new file called /boot/loader.conf and added some entries
Once rebooting my desktop, ifconfig ath0 and ifconfig wlan0 will say no carrier. If I run /etc/rc.d/wpa_supplicant start wlan0, running ifconfig ath0 and wlan0 will show some hope but ultimately, I still have no internet.
Numerous discussions have mentioned running [cmd=]ifconfig wlan create wlandev ath0[/cmd] I tried running it myself and keep on getting an errors that says "create: bad value".
I have taken pictures of my setup just because the desktop has no net at all and I might make errors if I retype them here.
Please see attached screenshots. thank you

After reading various discussions and the handbook and FreeBSD Diary, I made:
1. some changes to rc.conf and added some entries
2. created a new file called /boot/loader.conf and added some entries
Once rebooting my desktop, ifconfig ath0 and ifconfig wlan0 will say no carrier. If I run /etc/rc.d/wpa_supplicant start wlan0, running ifconfig ath0 and wlan0 will show some hope but ultimately, I still have no internet.
Numerous discussions have mentioned running [cmd=]ifconfig wlan create wlandev ath0[/cmd] I tried running it myself and keep on getting an errors that says "create: bad value".
I have taken pictures of my setup just because the desktop has no net at all and I might make errors if I retype them here.
Please see attached screenshots. thank you