vx — 3Com EtherLink III / Fast EtherLink III (3c59x) Ethernet driver

       The  vx  device driver and this manual page were written by Fred Gray <fgray@rice.edu>, based on the work
       of Herb Peyerl and with the assistance of numerous others.

       The vx driver is known not to reset the adapter correctly following a warm boot on some systems.

       The vx driver has not been exhaustively tested with all the models of cards that it claims to support.

Debian                                          October 24, 2018                                           VX(4)

       Some early-revision 3c590 cards are defective and suffer from many receive  overruns,  which  cause  lost
       packets.   The author has attempted to implement a test for it based on the information supplied by 3Com,
       but the test resulted mostly in spurious warnings.

       The performance of this driver is somewhat limited by the fact that it uses only polled-mode I/O and does
       not make use of the bus-mastering capability of the cards.

       The      vx     driver     is     not     present     in     FreeBSD     13.0     and     later.      See
       https://github.com/freebsd/fcp/blob/master/fcp-0101.md for more information.

       The vx driver provides support for the 3Com “Vortex” chipset.

       The medium selection can be influenced by the following link flags to the ifconfig(8) command:

       link0   Use the AUI port.
       link1   Use the BNC port.
       link2   Use the UTP port.

       All other diagnostics indicate either a hardware problem or a bug in the driver.

       The vx driver supports the following cards:

       •   3Com 3c590 EtherLink III PCI
       •   3Com 3c595 Fast EtherLink III PCI in 10 Mbps mode

       The vx device driver first appeared in FreeBSD 2.1.  It was derived from the ep  driver,  from  which  it
       inherits most of its limitations.

       vx — 3Com EtherLink III / Fast EtherLink III (3c59x) Ethernet driver

arp(4), netintro(4), ng_ether(4), ifconfig(8)

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

             devicevx

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

             if_vx_load="YES"