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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



     The txp driver is not present in FreeBSD 13.0 and later.  See for more information.


     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.

     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.