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AWI(4)                    OpenBSD Programmer's Manual                   AWI(4)

     awi - BayStack 650 IEEE 802.11FH PCMCIA wireless network device

     awi* at pcmcia?

     The awi driver provides support for wireless adapters based upon the AMD
     802.11 PCnet Mobile firmware.  The PCnet Mobile design is based on an AMD
     79c930 controller, which provides access to 32kb of memory shared between
     the controller and the host.  All host/device interaction is via this
     shared memory, which can be accessed either via PCMCIA memory space or
     I/O space.  The awi driver encapsulates all IP and ARP traffic as 802.11
     frames.  Transmit speed is fixed at 1Mbps.

     This card seems to take between 5 and 20 seconds after it has been
     brought up to synchronize with an AP.  When using dhclient(8) to automat-
     ically configure an address on this card, it may be advisable to delay
     the invocation of dhclient for about 10 seconds after the card is brought
     up using ifconfig(8).

     These are the modes the awi driver can operate in:

     BSS mode       Also known as infrastructure mode, this is used when asso-
                    ciating with an access point, through which all traffic
                    passes.  This is the only mode available for this card.

     The awi driver can be configured at runtime with ifconfig(8) or on boot
     with hostname.if(5) using the following parameters:

     bssid bssid
             Set the desired BSSID.

     -bssid  Unset the desired BSSID.  The interface will automatically select
             a BSSID in this mode, which is the default.

     chan n  Set the channel (radio frequency) to be used by the driver based
             on the given channel ID n.

     -chan   Unset the desired channel to be used by the driver.  The driver
             will automatically select a channel in this mode, which is the

     media media
             The awi driver supports the following media types:

             autoselect  Enable autoselection of the media type and options.
             FH1         Set legacy 802.11 FH 1Mbps operation.

     nwid id
             Set the network ID.  The id can either be any text string up to
             32 characters in length, or a series of hexadecimal digits up to
             64 digits.  An empty id string allows the interface to connect to
             any available access points.  By default the awi driver uses an
             empty string.  Note that network ID is synonymous with Extended
             Service Set ID (ESSID).

     -nwid   Set the network ID to the empty string to allow the interface to
             connect to any available access point.

     The following adapters are known to be supported:

           AMD Am79C930
           Bay Networks BayStack 650
           Bay Networks BayStack 660
           Bay Network AirSurfer Pro
           Farallon Communications SkyLINE Wireless
           Icom SL-200
           Nokia C020
           Zoom Air-4000

     The following hostname.if(5) example configures awi0 to join whatever
     network is available on boot, using channel 11, obtaining an IP address
     using DHCP:

           dhcp NONE NONE NONE chan 11

     Return awi0 to its default settings:

           # ifconfig awi0 -bssid -chan media autoselect nwid ""

     Join an existing BSS network, ``my_net'':

           # ifconfig awi0 netmask 0xffffff00 nwid my_net

     awi0: unable to allocate memory space; using i/o only  Indicates that the
     driver was not able to allocate 32kb of PCMCIA bus address space into
     which to map the device; the driver will use the (slightly slower) i/o-
     space only access methods to read and write to the shared memory.  This
     message is in some sense to be expected and should not be a cause for
     alarm.  See pcmcia(4) for information on how to increase the memory
     available to the PCMCIA controller.

     awi0: selftest failed (code %x)  The device failed to pass its internal

     awi0: device failed to complete selftest (code %x)  The device failed to
     complete its self test within 5 seconds.

     awi0: device timeout
     awi0: timeout waiting for command completion  The device failed to gener-
     ate an interrupt to acknowledge a command.

     awi0: transmit timeout  The device failed to generate an interrupt to ac-
     knowledge a transmitted packet.

     awi0: large frame truncated  The system handed the driver a packet which
     was too large to transmit in one piece.

     awi0: device enable failed  The system was unable to power on the card.

     awi0: associated with %s, SSID: %s  The device has successfully synchro-
     nized with the identified Access Point and is ready to relay traffic.

     awi0: no recent beacon from %s; rescanning  The device has not heard a
     beacon from its currently associated Access Point recently, and is look-
     ing for a new Access Point.

     awi0: received deauth  The Access Point the card was most recently asso-
     ciated with has forgotten about us.

     arp(4), ifmedia(4), intro(4), netintro(4), pcmcia(4), hostname.if(5),

     Am79C930 PCnet Mobile Single-Chip Wireless LAN Media Access Controller,

     The awi device driver first appeared in OpenBSD 2.7.

     The awi driver was written by Bill Sommerfeld <> and
     ported to OpenBSD by Angelos D. Keromytis <>.

     Doesn't support ad-hoc mode or WEP.  Round trip times seem higher than
     what one might expect.

OpenBSD 4.3                      May 31, 2007                                3