ath9k and batman-adv

I'm trying to use batman-adv with ath9k/openwrt. two boards(each board has one ath9k card and one ath5k card), ath9k on both boards are configured at the same channel(5), then I did :
#echo wlan1 > /proc/net/batman-adv/interfaces
on each of the board, however
#cat /proc/net/batman-adv/originators
showed up nothing.

Note: I have wlan0 with ath5k for AP, on different channels. I also have eth0 with local IP address but I did not add it to batman-adv.

I then tried to configure bat0 with IP address and then ping, of course it did not work.

anything else that I am missing here? anyone had success with ath9k/batman-adv?

thanks!
xxiao