Provided by: freebsd-manpages_7.2-1_all bug

NAME

     wb - Winbond W89C840F Fast Ethernet device driver

SYNOPSIS

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

           device miibus
           device wb

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

           if_wb_load="YES"

DESCRIPTION

     The wb driver provides support for PCI Ethernet adapters and embedded
     controllers based on the Winbond W89C840F Fast Ethernet controller chip.
     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’ workalike.  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 controller supports NWAY
                           autonegotiation.  The user can manually override
                           the autoselected mode by adding media options to
                           the /etc/rc.conf file.

     10baseT/UTP           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).

HARDWARE

     The wb driver supports Winbond W89C840F based Fast Ethernet adapters and
     embedded controllers including:

     ·   Trendware TE100-PCIE

DIAGNOSTICS

     wb%d: couldnt map memory  A fatal initialization error has occurred.

     wb%d: couldnt map interrupt  A fatal initialization error has occurred.

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

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

     wb%d: 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.

     wb%d: chip is in D3 power state -- setting to D0  This message applies
     only to adapters which support power management.  Some operating systems
     place the controller in low power mode when shutting down, and some PCI
     BIOSes fail to bring the chip out of this state before configuring it.
     The controller loses all of its PCI configuration in the D3 state, so if
     the BIOS does not set it back to full power mode in time, it will not be
     able to configure it correctly.  The driver tries to detect this
     condition and bring the adapter back to the D0 (full power) state, but
     this may not be enough to return the driver to a fully operational
     condition.  If you see this message at boot time and the driver fails to
     attach the device as a network interface, you will have to perform second
     warm boot to have the device properly configured.

     Note that this condition only occurs when warm booting from another
     operating system.  If you power down your system prior to booting
     FreeBSD, the card should be configured correctly.

SEE ALSO

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

HISTORY

     The wb device driver first appeared in FreeBSD 3.0.

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
     descriptors.  The wb driver handles this by forcing a reset of both the
     controller chip and attached PHY.  This is drastic, but it appears to be
     the only way to recover properly from this condition.