I've got an ASUS usb wireless adapter and hopefully found a Ralink driver worked for it. It'd be perfect if it can connect itself to the AP at boot. Presently, I connect manually with the commands (with root privileges):
# I dun know why I have to do it everytime but I dun do it, it fails to work
# I want it to have a static ip 192.168.0.12
ifconfig rausb0 up
# I dun endorse any encryption policy for testing purpose
iwconfig rausb0 essid "default"
# I've checked the routing table, the "default" always doesnt show up after boot
route add default gw 192.168.0.1 rausb0