bwi —
Broadcom BCM430x/4318 IEEE 802.11b/g wireless network
  driver
bwi* at pci? dev ? function ?
bwi* at cardbus? function ?
The bwi driver provides support for Broadcom
  BCM430x/4318 wireless network adapters. For more information on configuring
  this device, see ifconfig(8).
The following per-interface variables are implemented in the
  hw.bwiX branch of the
  sysctl(3) MIB.
  - debug
- Debug flags.
- dwell_time
- Channel dwell time during scan (msec).
- fw_version
- Firmware version.
- led_idle
- Number of ticks before LED enters idle state.
- led_blink
- Allow LED to blink.
- txpwr_calib
- Enable software TX power calibration.
The following cards are among those supported by thebwi
  driver:
  
    | Card | Chip | Bus | Standard | 
  
    | Buffalo WLI-CB-G54 | BCM4306 | CardBus | b/g | 
  
    | Buffalo WLI3-CB-G54L | BCM4318 | CardBus | b/g | 
  
    | Buffalo WLI-PCI-G54S | BCM4306 | PCI | b/g | 
  
    | Dell Wireless 1370 | BCM4318 | Mini PCI | b/g | 
  
    | Dell Wireless 1470 | BCM4318 | Mini PCI | b/g | 
  
    | Dell Truemobile 1400 | BCM4309 | Mini PCI | b/g | 
  
    | Dell Latitude D505 | BCM4306 | PCI | b/g | 
  
    | Apple AirPort Extreme |  |  | b/g | 
The firmware for the adapter is not shipped with NetBSD
  and must be obtained separately. An archive with firmware files that are known
  to work can be found at:
The firmware files conventionally reside in
    /libdata/firmware/bwi and will be loaded when the
    interface is brought up. Note: the v3 subdirectory in the
    above firmware archive should exist in the firmware folder. The full list of
    paths checked for firmware can be found in the
    hw.firmware.path
    sysctl(3) node.
The bwi driver first appeared in NetBSD
  6.0.
The bwi driver was written by Sepherosa
  Ziehau for Dragonfly BSD. It was ported to
  NetBSD by Taylor R. Campbell
  <riastradh@NetBSD.org>.
The hardware specification was reverse engineered by the people at
    http://bcm-specs.sipsolutions.net.
    Thanks go also to johill and mb on the #bcm-specs channel.
BCM4306 and BCM4309 chips do not work properly on channel 1, 2, and 3.