The card is Type 1 CF card and it doesn't have firmware in.
So we need to download the firmware image into the card before
touching it.
XXX downloading code should be written in generic (bus independent),
but I don't have enough information for now.
Roaming mode can change value into 'firm mode' and disable.
Authentication mode can change into 'Open System authentication'
and 'Shared Key Authentication' with Prism2 chip.
wi_get_id() was introduced in order that chip might judge automatically
whether it is Prism2 chip. Therefore, a pp_prism2 entry in
"struct wi_pcmcia_product" became unnecessary.