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PCN(4)		       FreeBSD Kernel Interfaces Manual			PCN(4)

NAME
     pcn -- AMD	PCnet/PCI Fast Ethernet	device driver

SYNOPSIS
     device miibus
     device pcn

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.

     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:

     +o	 AMD Am53C974/Am79C970/Am79C974	PCnet-PCI
     +o	 AMD Am79C970A PCnet-PCI II
     +o	 AMD Am79C971 PCnet-FAST
     +o	 AMD Am79C972 PCnet-FAST+
     +o	 AMD Am79C973/Am79C975 PCnet-FAST III
     +o	 AMD Am79C976 PCnet-PRO
     +o	 AMD PCnet/Home	HomePNA
     +o	 Allied-Telesis	LA-PCI
     +o	 Contec	C-NET(98)S (PC-98)
     +o	 NEC SV-98/2-B05, B06

DIAGNOSTICS
     pcn%d: couldn't map ports/memory  A fatal initialization error has
     occurred.

     pcn%d: couldn't map interrupt  A fatal initialization error has occurred.

     pcn%d: watchdog timeout  The device has stopped responding	to the net-
     work, or there is a problem with the network connection (e.g. a cable
     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>.

FreeBSD	9.2		      September	13, 2004		   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=pcn&sektion=4&manpath=FreeBSD+5.4-RELEASE>

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