Revision as of 10:20, 22 June 2009

Overo Air and Overo Fire COMs have a 802.11(g) wireless module "on board". This page gives some details about the hardware and software configuration for this Wifi module.

Hardware

This section gives some infos about various hardware related topics regarding Overo Wifi.

Module

Overo Wifi solution is based on an Wi2Wi chip based on Marvell's industry leading 88W8686 which brings 802.11(b/g) wifi.

MMC

Overo fire's WiFi port connected to MMC port 2 in 4 bit configuration.

Connector

Wifi antenna has to be connected to J2 (see picture WIFI ANT) on Overo Air or Fire COMs.

Note: J3 is BlueTooth connector and can use same antenna.

Antenna

Gumstix' u.fl Antenna is compatible to Overo Air and Fire connectors.

Software

Official Overo pre-built Linux images or developer images contain already support for Overo Wifi. However, wifi configuration depending on your local wifi environment still has to be done.

Boot messages

At Overo boot, you should get something like

...
libertas_sdio: Libertas SDIO driver
libertas_sdio: Copyright Pierre Ossman
libertas_sdio mmc1:0001:1: firmware: requesting sd8686_helper.bin
libertas_sdio mmc1:0001:1: firmware: requesting sd8686.bin
libertas: 00:19:88:05:b5:31, fw 9.70.3p24, cap 0x00000303
libertas: PREP_CMD: command 0x00a3 failed: 2
libertas: PREP_CMD: command 0x00a3 failed: 2
libertas: eth0: Marvell WLAN 802.11 adapter 
...

Note: The two “command 0×00a3 failed” messages are harmless, and have to do with features that are not supported.

Test

For test of basic functionality, do the following at command line (after log in as root / no password):

root@overo:~# iwconfig wlan0 essid any
root@overo:~# ifconfig wlan0 up
root@overo:~# iwlist wlan0 scan

what should list the wifi's visible, then.

Unencypted wifi

tbd.

WEP encryption

• Edit /etc/network/interfaces to have only for wlan0 (don't touch the other entries):

iwconfig wlan0 essid "My Wireless Network"
iwconfig wlan0 key my-hex-key
ifdown wlan0
ifup wlan0

WPA encryption

• Edit /etc/network/interfaces to have only for wlan0 (don't touch the other entries):

allow-hotplug wlan0
iface wlan0 inet dhcp
      pre-up wpa_supplicant -Dwext -iwlan0 -c/etc/wpa_supplicant.conf -B
      down killall wpa_supplicant

• Create /etc/wpa_supplicant.conf containing:

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
eapol_version=1
ap_scan=1
fast_reauth=1

network={
      ssid="add-your-ascii-ssid"
      proto=WPA2
      key_mgmt=WPA-PSK
      pairwise=CCMP TKIP
      group=CCMP TKIP
      scan_ssid=1
      psk="add-your-ascii-passphrase"
      priority=10
} 

Links

• Wi2Wi W2CBW003 Wifi/Bluetooth module review