My USB wireless adapter ???

[lin shane]

Hello,
I'm using USB wireless adapter-> Senao SL2511ub
on FreeBSD 4.11 Release,

now dmesg shows that

ugen0: Intersil Prism2.x or Atmel WLAN rev 1.10/1.32, addr2

but I try to do this:
# ifconfig ugen0 up

it doesn't work....

Could anyone help me to UP this adapter?
thanks!! thanks!!