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    The following form allows you to view linux man pages.

    Command:

    pcn

    
         kernel configuration file:
    
               device miibus
               device pcn
    
         Alternatively, to load the driver as a module at boot time, place the
         following line in loader.conf(5):
    
               if_pcn_load="YES"
    
    
    

    DESCRIPTION

         The pcn driver provides support for PCI Ethernet adapters and embedded
         controllers based on the AMD PCnet/FAST, PCnet/FAST+, PCnet/FAST III,
         PCnet/PRO and PCnet/Home Ethernet controller chips.  Supported NIC's
         include the Allied Telesyn AT-2700 family.
    
         The PCnet/PCI chips include a 100Mbps Ethernet MAC and support both a
         serial and MII-compliant transceiver interface.  They use a bus master
         DMA and a scatter/gather descriptor scheme.  The AMD chips provide a
         mechanism for zero-copy receive, providing good performance in server
         environments.  Receive address filtering is provided using a single per-
         fect filter entry for the station address and a 64-bit multicast hash ta-
         ble.
    
         The pcn driver supports the following media types:
    
         autoselect   Enable autoselection of the media type and options.  The
                      user can manually override the autoselected mode by adding
                      media options to rc.conf(5).
    
         10baseT/UTP  Set 10Mbps operation.  The ifconfig(8) mediaopt option can
                      also be used to select either 'full-duplex' or 'half-duplex'
                      modes.
    
         100baseTX    Set 100Mbps (Fast Ethernet) operation.  The ifconfig(8)
                      mediaopt option can also be used to select either
                      'full-duplex' or 'half-duplex' modes.
    
         The pcn driver supports the following media options:
    
         full-duplex  Force full duplex operation
    
         half-duplex  Force half duplex operation.
    
         For more information on configuring this device, see ifconfig(8).
    
    
    

    HARDWARE

         The pcn driver supports adapters and embedded controllers based on the
         AMD PCnet/FAST, PCnet/FAST+, PCnet/FAST III, PCnet/PRO and PCnet/Home
         Fast Ethernet chips:
    
         ?   AMD Am79C971 PCnet-FAST
         fault).
    
         pcn%d: no memory for rx list  The driver failed to allocate an mbuf for
         the receiver ring.
    
         pcn%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.
    
         pcn%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 a 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)
    
         AMD PCnet/FAST, PCnet/FAST+ and PCnet/Home datasheets,
         http://www.amd.com.
    
    
    

    HISTORY

         The pcn device driver first appeared in FreeBSD 4.3.
    
    
    

    AUTHORS

         The pcn driver was written by Bill Paul <wpaul@osd.bsdi.com>.
    
    
    

    BSD January 31, 2006 BSD

    
    
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