according to the answer by Lub/Olimex in topic " Re: Whichi USB-Wifi dongle are supported by iMX233-OLinuXino-MICRO", I bought a TL-WN722n
I don't succeed booting with the path given on olimex web, whose modules seems: 3.1.10-11-ARCH .
(see another post)
So I followed: http://archlinuxarm.org/platforms/armv5/olinuxino .
I created a ScCard, it boots.
When I plug usb adapter, it appears as Vid 0cf3, Pid 9271 by Atheros, p/n: 12345.
Howto use it ?
Wathching /usr/lib/modules/2.6.35-6-ARCH+/kernel/drivers/net/wireless I found 4 folders: hostap, rt2x00, rtl818x, zd1211r.