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    The following form allows you to view linux man pages.

    Command:

    wb

    
         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 autonegotia-
                               tion.  The user can manually override the autose-
                               lected 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 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 condi-
         tion 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 oper-
         ating 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 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 July 16, 2005 BSD

    
    
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