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VR(4)                     OpenBSD Programmer's Manual                    VR(4)

     vr - VIA VT3043/VT86C100A/VT6105/VT6105M 10/100 Ethernet device

     vr* at pci?
     amphy* at mii?
     sqphy* at mii?

     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.  This
     includes the D-Link DFE530-TX and various other commodity Fast Ethernet

     The VIA Rhine chips use bus master DMA and have a software interface
     designed to resemble that of the DEC 21x4x "tulip" chips.  The major
     differences are that the receive filter in the Rhine chips is much
     simpler and is programmed through registers rather than by downloading a
     special setup frame through the transmit DMA engine, and that 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

     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 appropriate hostname.if(5) file.

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

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

     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

     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 won't be
     able to configure it correctly.  The driver tries to detect this
     condition 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 this message appears at boot time and the driver fails to
     attach the device as a network interface, a second warm boot will have to
     be performed to have the device properly configured.

     Note that this condition only occurs when warm booting from another
     operating system.  If the system is powered down prior to booting
     OpenBSD, the card should be configured correctly.

     amphy(4), arp(4), ifmedia(4), intro(4), netintro(4), pci(4), sqphy(4),
     hostname.if(5), ifconfig(8)

     The VIA Technologies VT86C100A data sheet,

     The vr device driver first appeared in FreeBSD 3.0.  OpenBSD support
     first appeared in OpenBSD 2.5.

     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
     buffer address and begin DMAing from the wrong location.  This buffer
     copying impairs transmit performance on slower systems but can't be
     avoided.  On faster machines (e.g., a Pentium II), the performance impact
     is much less noticeable.

OpenBSD 4.8                     March 16, 2009                     OpenBSD 4.8