[FB7|wireless]Atheros 5213 cannot search AP

[magnus]

I added a new minipci wireless card of Atheros 5213 chipset in my laptop last week, then I make a new kernel which contains necessary entries related "ath" and "wlan", that's all according to the handbook. After finished these works my freebsd7-stable recognized this new minipci card.
But if I search for any ssid it will stop and no further response.
Could someone help me diagnostic how to resolve this problem?
Thanks a lot.

# ifconfig ath0 up scan

#dmesg | grep ath0
ath0: <Atheros 5212> mem 0xfcfd0000-0xfcfdffff irq 9 at device 3.0 on pci1
ath0: [ITHREAD]
ath0: using obsoleted if_watchdog interface
ath0: Ethernet address: [numbers]
ath0: mac 5.9 phy 4.3 radio 4.6

#pciconf -lv
ath0@pci0:1:3:0:	class=0x020000 card=0x057e1014 chip=0x1014168c rev=0x01 hdr=0x00
    vendor     = 'Atheros Communications Inc.'
    device     = 'AR5212 Atheros AR5212 802.11abg wireless'
    class      = network
    subclass   = ethernet

#ifconfig ath0
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether [numbers]
	media: IEEE 802.11 Wireless Ethernet autoselect (autoselect)
	status: no carrier
	ssid "" channel 8 (2447 Mhz 11g)
	authmode OPEN privacy OFF txpower 31.5 bmiss 7 scanvalid 60 bgscan
	bgscanintvl 300 bgscanidle 250 roam:rssi11g 7 roam:rate11g 5
	protmode CTS burst