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     txp — 3Com 3XP Typhoon/Sidewinder (3CR990) Ethernet interface


     To compile this driver into the kernel, place the following line in your
     kernel configuration file:

           device txp

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):



     The txp interface provides access to the 10Mb/s and 100Mb/s Ethernet
     networks via the 3Com Typhoon/Sidewinder chipset.

     Basic Ethernet functions are provided as well as support for vlan(4) tag
     removal and insertion assistance, receive ip(4), tcp(4), and udp(4)
     checksum offloading, and transmit ip(4) checksum offloading.  There is
     currently no support for transmit tcp(4) or udp(4) checksum offloading,
     tcp(4) segmentation, nor ipsec(4) acceleration.

     Each of the host's network addresses is specified at boot time with an
     SIOCSIFADDR ioctl(2).  The txp interface employs the address resolution
     protocol described in arp(4) to dynamically map between Internet and
     Ethernet addresses on the local network.

     When a txp interface is brought up, by default, it will attempt to auto-
     negotiate the link speed and duplex mode.  The speeds, in order of
     attempt, are: 100Mb/s Full Duplex, 100Mb/s Half Duplex, 10 Mb/s Full
     Duplex, and 10 Mb/s Half Duplex.

     The txp supports several media types, which are selected via the
     ifconfig(8) command.  The supported media types are:

     media autoselect
             Attempt to autoselect the media type (default)

     media 100baseTX mediaopt full-duplex
             Use 100baseTX, full duplex

     media 100baseTX [mediaopt half-duplex]
             Use 100baseTX, half duplex

     media 10baseT mediaopt full-duplex
             Use 10baseT, full duplex

     media 10baseT [mediaopt half-duplex]
             Use 10baseT, half duplex


     The txp driver supports the following cards:

           ·   3Com 3CR990-TX-95
           ·   3Com 3CR990-TX-97
           ·   3Com 3cR990B-TXM
           ·   3Com 3CR990SVR95
           ·   3Com 3CR990SVR97
           ·   3Com 3cR990B-SRV


     altq(4), arp(4), inet(4), intro(4), ip(4), miibus(4), tcp(4), udp(4),
     vlan(4), ifconfig(8)


     The txp driver first appeared in OpenBSD 2.9.