IPW2200_EEPROM_MAC
val = ipw2200_rom_get16(sc, IPW2200_EEPROM_MAC + 0);
val = ipw2200_rom_get16(sc, IPW2200_EEPROM_MAC + 1);
val = ipw2200_rom_get16(sc, IPW2200_EEPROM_MAC + 2);