Setup examples for various peripherals
Wireless: TP-Link TL-WN722N USB wireless adaptor (Debian 6)
This will serve as a general guide for USB wireless devices but may need modifying for your specific one.
Edit /etc/apt/sources.list to add the non-free archive and backports:
deb http://ftp.us.debian.org/debian/ squeeze main non-free deb http://security.debian.org/ squeeze/updates main non-free deb http://ftp.us.debian.org/debian/ squeeze-updates main non-free deb http://backports.debian.org/debian-backports squeeze-backports main non-free
Update tha package cache:
Download the required firmware and put it in the correct location - you may not need to do this for your adaptor.
wget http://linuxwireless.org/download/htc_fw/1.3/htc_9271.fw cp htc_9271.fw /lib/firmware
Plug in adaptor
Confirm adaptor is present:
root@raspberrypi:~# iwconfig lo no wireless extensions. eth0 no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off
If no wlanx device is shown, you might need to download firmware for your USB wifi device (or track down other compatible drivers if they are available). To confirm this, check the dmesg output when you plug in your adaptor - typing dmesg at the command prompt may be sufficient - and look for information related to your adaptor - the example dmesg output below shows what is seen in the event of the TP-Link firmware not being present - notice that the name of the required firmware file is given (htc_9271.fw), the driver name (ath9k_htc) and an error -22 message:
usb 1-18.104.22.168: ath9k_htc: Firmware - htc_9271.fw not found ath9k_htc: probe of 1-22.214.171.124:1.0 failed with error -22 usbcore: registered new interface driver ath9k_htc
Armed with this information, try a web search for the name of the driver or driver file and/or head over to http://linuxwireless.org