.\"	$OpenBSD: awi.4,v 1.23 2006/11/10 20:06:58 mk Exp $
.\"     $NetBSD: awi.4,v 1.1 1999/11/04 19:36:01 sommerfeld Exp $
.\"
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Bill Sommerfeld
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    must display the following acknowledgement:
.\"        This product includes software developed by the NetBSD
.\"        Foundation, Inc. and its contributors.
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.\"    contributors may be used to endorse or promote products derived
.\"    from this software without specific prior written permission.
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.Dd March 20, 2004
.Dt AWI 4
.Os
.Sh NAME
.Nm awi
.Nd BayStack 650 IEEE 802.11FH PCMCIA wireless network device
.Sh SYNOPSIS
.Cd "awi* at pcmcia?"
.Sh DESCRIPTION
The
.Nm
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
.Nm
driver encapsulates all IP and ARP traffic as 802.11 frames.
Transmit speed is fixed at 1Mbps.
.Pp
This card seems to take between 5 and 20 seconds after it has been brought up
to synchronize with an AP.
When using
.Xr dhclient 8
to automatically 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
.Xr ifconfig 8 .
.Pp
These are the modes the
.Nm
driver can operate in:
.Bl -tag -width "IBSS-masterXX"
.It BSS mode
Also known as
.Em infrastructure
mode, this is used when associating with an access point, through
which all traffic passes.
This is the only mode available for this card.
.El
.Sh CONFIGURATION
The
.Nm
driver can be configured at runtime with
.Xr ifconfig 8
or on boot with
.Xr hostname.if 5
using the following parameters:
.Bl -tag -width Ds
.It Cm bssid Ar bssid
Set the desired BSSID.
.It Fl bssid
Unset the desired BSSID.
The interface will automatically select a BSSID in this mode, which is
the default.
.It Cm chan Ar n
Set the channel (radio frequency) to be used by the driver based on
the given channel ID
.Ar n .
.It Fl 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.
.It Cm media Ar media
The
.Nm
driver supports the following
.Ar media
types:
.Pp
.Bl -tag -width autoselect -compact
.It Cm autoselect
Enable autoselection of the media type and options.
.It Cm FH1
Set legacy 802.11 FH 1Mbps operation.
.El
.It Cm nwid Ar id
Set the network ID.
The
.Ar 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
.Ar id
string allows the interface to connect to any available access points.
By default the
.Nm
driver uses an empty string.
Note that network ID is synonymous with Extended Service Set ID (ESSID).
.It Fl nwid
Set the network ID to the empty string to allow the interface to connect
to any available access point.
.El
.Sh HARDWARE
The following adapters are known to be supported:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It AMD Am79C930
.It Bay Networks BayStack 650
.It Bay Networks BayStack 660
.It Bay Network AirSurfer Pro
.It Farallon Communications SkyLINE Wireless
.It Icom SL-200
.It Nokia C020
.It Zoom Air-4000
.El
.Sh EXAMPLES
The following
.Xr hostname.if 5
example configures awi0 to join whatever network is available on boot,
using channel 11, obtaining an IP address using DHCP:
.Bd -literal -offset indent
dhcp NONE NONE NONE chan 11
.Ed
.Pp
Return awi0 to its default settings:
.Bd -literal -offset indent
# ifconfig awi0 -bssid -chan media autoselect nwid ""
.Ed
.Pp
Join an existing BSS network,
.Dq my_net :
.Bd -literal -offset indent
# ifconfig awi0 192.168.1.1 netmask 0xffffff00 nwid my_net
.Ed
.Sh DIAGNOSTICS
.Bl -diag
.It "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
.Xr pcmcia 4
for information on how to increase the memory available to the PCMCIA
controller.
.It "awi0: selftest failed (code %x)"
The device failed to pass its internal selftest.
.It "awi0: device failed to complete selftest (code %x)"
The device failed to complete its self test within 5 seconds.
.It "awi0: device timeout"
.It "awi0: timeout waiting for command completion"
The device failed to generate an interrupt to acknowledge a command.
.It "awi0: transmit timeout"
The device failed to generate an interrupt to acknowledge a
transmitted packet.
.It "awi0: large frame truncated"
The system handed the driver a packet which was too large to transmit
in one piece.
.It "awi0: device enable failed"
The system was unable to power on the card.
.It "awi0: associated with %s, SSID: %s"
The device has successfully synchronized with the identified Access
Point and is ready to relay traffic.
.It "awi0: no recent beacon from %s; rescanning"
The device has not heard a beacon from its currently associated Access
Point recently, and is looking for a new Access Point.
.It "awi0: received deauth"
The Access Point the card was most recently associated with has
forgotten about us.
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr ifmedia 4 ,
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr pcmcia 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8
.Rs
.%T Am79C930 PCnet Mobile Single-Chip Wireless LAN Media Access Controller
.%O http://www.amd.com
.Re
.Sh HISTORY
The
.Nm
device driver first appeared in
.Ox 2.7 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Bill Sommerfeld Aq sommerfeld@netbsd.org
and ported to
.Ox
by
.An Angelos D. Keromytis Aq angelos@dsl.cis.upenn.edu .
.Sh BUGS
Doesn't support ad-hoc mode or WEP.
Round trip times seem higher than what one might expect.