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WB(4)                    BSD Kernel Interfaces Manual                    WB(4)

NAME
     wb -- Winbond W89C840F 10/100 Ethernet device

SYNOPSIS
     wb* at pci?
     amphy* at mii?

DESCRIPTION
     The wb driver provides support for PCI Ethernet adapters and embedded
     controllers based on the Winbond W89C840F Fast Ethernet controller chip.
     This includes the TRENDnet TE100-PCIE and various other cheap boards.
     The 840F should not be confused with the 940F, which is an NE2000 clone
     and only supports 10Mbps speeds.

     The Winbond controller uses bus master DMA and is designed to be a DEC
     "tulip" work-alike.  It differs from the standard DEC design in several
     ways: the control and status registers are spaced 4 bytes apart instead
     of 8, and the receive filter is programmed through registers rather than
     by downloading a special setup frame via the transmit DMA engine.  Using
     an external PHY, the Winbond chip supports both 10 and 100Mbps speeds in
     either full or half duplex.

     The wb driver supports the following media types:

     autoselect   Enable autoselection of the media type and options.  This is
                  only supported if the PHY chip attached to the Winbond con-
                  troller supports NWAY autonegotiation.  The user can manu-
                  ally override the autoselected mode by adding media options
                  to the appropriate hostname.if(5) file.

     10baseT      Set 10Mbps operation.  The mediaopt option can also be used
                  to select either full-duplex or half-duplex modes.

     100baseTX    Set 100Mbps (Fast Ethernet) operation.  The mediaopt option
                  can also be used to select either full-duplex or half-duplex
                  modes.

     The wb driver supports the following media options:

     full-duplex  Force full duplex operation.

     half-duplex  Force half duplex operation.

     Note that the 100baseTX media type is only available if supported by the
     adapter.  For more information on configuring this device, see
     ifconfig(8).

DIAGNOSTICS
     wb0: couldn't map memory  A fatal initialization error has occurred.

     wb0: couldn't map interrupt  A fatal initialization error has occurred.

     wb0: watchdog timeout  The device has stopped responding to the network,
     or there is a problem with the network connection (cable).

     wb0: no memory for rx list  The driver failed to allocate an mbuf for the
     receiver ring.

     wb0: no memory for tx list  The driver failed to allocate an mbuf for the
     transmitter ring when allocating a pad buffer or collapsing an mbuf chain
     into a cluster.

SEE ALSO
     amphy(4), arp(4), ifmedia(4), intro(4), netintro(4), pci(4),
     hostname.if(5), ifconfig(8)

HISTORY
     The wb device driver first appeared in FreeBSD 3.0.  OpenBSD support
     first appeared in OpenBSD 2.5.

AUTHORS
     The wb driver was written by Bill Paul <wpaul@ctr.columbia.edu>.

BUGS
     The Winbond chip seems to behave strangely in some cases when the link
     partner switches modes.  If, for example, both sides are set to 10Mbps
     half-duplex, and the other end is changed to 100Mbps full-duplex, the
     Winbond's receiver suddenly starts writing trash all over the RX descrip-
     tors.  The wb driver handles this by forcing a reset of both the con-
     troller chip and attached PHY.  This is drastic, but it appears to be the
     only way to recover properly from this condition.

BSD                             March 30, 2017                             BSD