I'm back !
So, I take a look to the post and ok for the driver.
I finally could make it and install it (r8712u.ko)
I installed netcfg to configure a profile :
$this->bbcode_second_pass_quote('', 'C')ONNECTION="wireless"
ESSID="MY_ESSID"
INTERFACE="wlan0"
DESCRIPTION="Automatically generated profile"
SCAN="yes"
IP="dhcp"
TIMEOUT="10"
SECURITY="wep"
KEY="WEP_CODE"
