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PCN(4) BSD Kernel Interfaces Manual PCN(4) NAME pcn -- AMD PCnet/PCI Fast Ethernet device driver SYNOPSIS To compile support for the pcn driver into your kernel, place the following lines in your kernel configuration file: device miibus device pcn Alternatively, to load the pcn driver 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, PC- net/PRO and PCnet/Home Ethernet controller chips. Supported NIC's in- clude the Allied Telesyn AT-2700 familly. The PCnet/PCI chips include a 100Mbps Ethernet MAC and support both a se- rial and MII-compliant transceiver interface. They use a bus master DMA and a scatter/gather descriptor scheme. The AMD chips provide a mecha- nism for zero-copy receive, providing good performance in server environ- ments. Receive address filtering is provided using a single perfect fil- ter entry for the station address and a 64-bit multicast hash table. 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 oc- curred. 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>. BSD July 16, 2005 BSD
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS
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