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SK(4)			 BSD Kernel Interfaces Manual			 SK(4)

     sk	-- SysKonnect SK-984x and SK-982x PCI gigabit ethernet adapter driver

     device miibus
     device sk

     The sk driver provides support for	the SysKonnect SK-984x and SK-982x se-
     ries PCI gigabit ethernet adapters, including the following:

	   o   SK-9821 SK-NET GE-T single port,	1000baseT adapter
	   o   SK-9822 SK-NET GE-T dual	port, 1000baseT	adapter
	   o   SK-9841 SK-NET GE-LX single port, single	mode fiber adapter
	   o   SK-9842 SK-NET GE-LX dual port, single mode fiber adapter
	   o   SK-9843 SK-NET GE-SX single port, multimode fiber adapter
	   o   SK-9844 SK-NET GE-SX dual port, multimode fiber adapter

     The SysKonnect adapters consist of	two main components: the XaQti Corp.
     XMAC II gigabit MAC and the SysKonnect GEnesis controller ASIC.  The XMAC
     provides the gigabit MAC and PHY suspport while the GEnesis provides an
     interface to the PCI bus, DMA support, packet buffering and arbitration.
     The GEnesis can control up	to two XMACs simultaneously, allowing dual-
     port NIC configurations.

     The SK-982x 1000baseT adapters also include a Broadcom BCM5400 1000baseTX
     PHY which is used in place	of the XMAC's internal PHY.  The Broadcom PHY
     is	connected to the XMAC via its GMII port.

     The sk driver configures dual port	SysKonnect adapters such that each
     XMAC is treated as	a separate logical network interface.  Both ports can
     operate indepenently of each other	and can	be connected to	separate net-
     works.  The SysKonnect driver software currently only uses	the second
     port on dual port adapters	for failover purposes: if the link on the pri-
     mary port fails, the SysKonnect driver will automatically switch traffic
     onto the second port.

     The XaQti XMAC II supports	full and half duplex operation with autonego-
     tiation.  The XMAC	also supports unlimited	frame sizes.  Support for
     jumbo frames is provided via the interface	MTU setting.  Selecting	an MTU
     larger than 1500 bytes with the ifconfig(8) utility configures the
     adapter to	receive	and transmit jumbo frames.  Using jumbo	frames can
     greatly improve performance for certain tasks, such as file transfers and
     data streaming.

     The sk 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 the /etc/rc.conf

     1000baseTX		   Set 1000baseTX operation over twisted pair.	This
			   is only available for SK-982x series	adapters with
			   1000baseT ports.  Both full-duplex and half-duplex
			   modes are supported.

     1000baseSX		   Set 1000Mbps	(gigabit ethernet) operation.  Both
			   full-duplex and half-duplex modes are supported.

     The sk driver supports the	following media	options:

     full-duplex	   Force full duplex operation

     half-duplex	   Force half duplex operation.

     The sk driver also	supports one special link option for 1000baseTX	cards:

     link0		   With	1000baseTX cards, establishing a link between
			   two ports requires that one port be configured as a
			   master and the other	a slave.  With autonegotia-
			   tion, the master/slave settings will	be chosen au-
			   tomatically.	 However when manually selecting the
			   link	state, it is necessary to force	one side of
			   the link to be a master and the other a slave.  The
			   sk driver configures	the ports as slaves by de-
			   fault.  Setting the link0 flag with ifconfig(8)
			   will	set a port as a	master instead.

     For more information on configuring this device, see ifconfig(8).

     sk%d: couldn't map	memory	A fatal	initialization error has occurred.

     sk%d: couldn't map	ports  A fatal initialization error has	occurred.

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

     sk%d: no memory for softc struct!	The driver failed to allocate memory
     for per-device instance information during	initialization.

     sk%d: failed to enable memory mapping!  The driver	failed to initialize
     PCI shared	memory mapping.	 This might happen if the card is not in a
     bus-master	slot.

     sk%d: no memory for jumbo buffers!	 The driver failed to allocate memory
     for jumbo frames during initialization.

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

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

     XaQti XMAC	II datasheet,

     SysKonnect	GEnesis	programming manual,

     The sk device driver first	appeared in FreeBSD 3.0.

     The sk driver was written by Bill Paul <>.

BSD				 July 3, 1999				   BSD


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