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From: Warren Block <wblock@wonkity.com>
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Subject: Testing 802.11n
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-CURRENT plus yesterday's patch.  The kernel config is just

   include GENERIC
   nocpu   I486_CPU
   ident   TEST11N

   option  ATH_ENABLE_11N

ifconfig wlan0 shows

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
 	ether --
 	inet 192.168.1.102 netmask 0xffffff00 broadcast 192.168.1.255
 	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
 	media: IEEE 802.11 Wireless Ethernet MCS mode 11ng
 	status: associated
 	ssid -- channel 6 (2437 MHz 11g ht/20) bssid --
 	regdomain 100 indoor ecm authmode WPA2/802.11i privacy ON
 	deftxkey UNDEF AES-CCM 2:128-bit txpower 20 bmiss 7 scanvalid 450
 	bgscan bgscanintvl 300 bgscanidle 250 roam:rssi 7 roam:rate 64
 	protmode CTS -ampdutx ampdurx ampdulimit 32k ampdudensity 8 shortgi
 	wme burst roaming MANUAL

Should this work?

# ifconfig wlan0 mode 11n
ifconfig: SIOCSIFMEDIA (media): Device not configured