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VR(4)			 BSD Kernel Interfaces Manual			 VR(4)

     vr	-- VIA Technologies Rhine I/II/III Ethernet device driver

     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device miibus
	   device vr

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):


     The vr driver provides support for	PCI Ethernet adapters and embedded
     controllers based on the VIA Technologies VT3043 Rhine I, VT86C100A Rhine
     II, and VT6105/VT6105M Rhine III Fast Ethernet controller chips.

     The VIA Rhine chips use bus master	DMA and	have a descriptor layout de-
     signed to resemble	that of	the DEC	21x4x "tulip" chips.  The register
     layout is different however and the receive filter	in the Rhine chips is
     much simpler and is programmed through registers rather than by download-
     ing a special setup frame through the transmit DMA	engine.	 Transmit and
     receive DMA buffers must be longword aligned.  The	Rhine chips are	meant
     to	be interfaced with external physical layer devices via an MII bus.
     They support both 10 and 100Mbps speeds in	either full or half duplex.

     The vr 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

     10baseT/UTP	   Set 10Mbps operation.  The mediaopt option can also
			   be used to select either full-duplex	or half-duplex

     100baseTX		   Set 100Mbps (Fast Fthernet) operation.  The
			   mediaopt option can also be used to select either
			   full-duplex or half-duplex modes.

     The vr 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

     The vr driver supports VIA	Technologies Rhine I, Rhine II,	and Rhine III
     based Fast	Ethernet adapters including:

     o	 AOpen/Acer ALN-320
     o	 D-Link	DFE530-TX
     o	 Hawking Technologies PN102TX

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

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

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

     vr%d: no memory for rx list  The driver failed to allocate	an mbuf	for
     the receiver ring.

     vr%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.

     vr%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.

     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), polling(4),

     The VIA Technologies VT86C100A data sheet,

     The vr device driver first	appeared in FreeBSD 3.0.

     The vr driver was written by Bill Paul <>.

     The vr driver always copies transmit mbuf chains into longword-aligned
     buffers prior to transmission in order to pacify the Rhine	chips.	If
     buffers are not aligned correctly,	the chip will round the	supplied buf-
     fer address and begin DMAing from the wrong location.  This buffer	copy-
     ing impairs transmit performance on slower	systems	but cannot be avoided.
     On	faster machines	(e.g. a	Pentium	II), the performance impact is much
     less noticeable.

BSD				 July 16, 2005				   BSD


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