.\"     $OpenBSD: txp.4,v 1.21 2008/04/20 05:47:05 brad Exp $
.\"
.\" Copyright (c) 2001 Jason L. Wright (jason@thought.net)
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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.\"
.Dd $Mdocdate: April 20 2008 $
.Dt TXP 4
.Os
.Sh NAME
.Nm txp
.Nd 3Com 3XP Typhoon/Sidewinder (3CR990) 10/100 Ethernet device
.Sh SYNOPSIS
.Cd "txp* at pci?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the
.Tn 3Com
.Tn Typhoon/Sidewinder
Fast Ethernet chipset, including the following:
.Pp
.Bl -bullet -offset indent -compact
.It
3Com 3CR990-TX-95
.It
3Com 3CR990-TX-97
.It
3Com 3CR990SVR95
.It
3Com 3CR990SVR97
.El
.Pp
The
.Nm
driver supports VLAN tag insertion, IPv4 receive IP/TCP/UDP
checksum offloading and transmit IP checksum offloading.
.Pp
The
.Nm
driver supports the following media types:
.Bl -tag -width 100baseTX
.It Cm autoselect
Enable autoselection of the media type and options.
The user can manually override
the autoselected mode by adding media options to the appropriate
.Xr hostname.if 5
file.
.It Cm 10baseT
Set 10Mbps operation.
The
.Xr ifconfig 8
.Ic mediaopt
option can also be used to select either
.Cm full-duplex
or 
.Cm half-duplex
modes.
.It Cm 100baseTX
Set 100Mbps (Fast Ethernet) operation.
The
.Xr ifconfig 8
.Ic mediaopt
option can also be used to select either
.Cm full-duplex
or
.Cm half-duplex
modes.
.El
.Pp
The
.Nm
driver supports the following media options:
.Bl -tag -width full-duplex
.It Cm full-duplex
Force full duplex operation.
.It Cm half-duplex
Force half duplex operation.
.El
.Pp
For more information on configuring this device, see
.Xr ifconfig 8 .
.Sh FILES
The driver needs a firmware file,
which is loaded on demand when the device is attached:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It Pa /etc/firmware/3c990
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr ifmedia 4 ,
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr pci 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 2.9 .