paulroyland,
I have the Belkin F5D7050 USB adapter which uses the Ralink RL2501USB chipset. According to hxxp://ralink.rapla.net/, this is the same chipset as your Linksys.
After booting BT4 (I am using BT4 Pre Final), insert the adapter and check dmesg, you should see something like this at the end.
Code:
root@bt:/#dmesg
...
usb 1-4: new high speed USB device using ehci_hcd and address 4
usb 1-4: configuration #1 chosen from 1 choice
cfg80211: Using static regulatory domain info
cfg80211: Regulatory domain: US
(start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
(2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2700 mBm)
(5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
(5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
(5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
(5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
(5735000 KHz - 5835000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)
cfg80211: Calling CRDA for country: US
cfg80211: Regulatory domain changed to country: US
(start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
(2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm)
(5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
(5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
(5490000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
(5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
wmaster0 (rt73usb): not using net_device_ops yet
phy0: Selected rate control algorithm 'minstrel'
wlan0 (rt73usb): not using net_device_ops yet
Registered led device: rt73usb-phy0:radio
Registered led device: rt73usb-phy0:assoc
Registered led device: rt73usb-phy0:quality
usbcore: registered new interface driver rt73usb
usbcore: registered new interface driver rt2500usb
In this case, my interface is wlan0.
Using lsmod and grepping for the rt modules shows that BT4 is using them.
Code:
root@bt:~# lsmod |grep rt73
rt73usb 25136 0
rt2x00usb 9772 2 rt2500usb,rt73usb
rt2x00lib 35500 3 rt2500usb,rt73usb,rt2x00usb
Useing iwconfig, i see the device.
Code:
root@bt:~# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wmaster0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:""
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Tx-Power=17 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
I can now use iwconfig, wicd, or any other utilities with the interface...
Hope this helps,
Enjoy