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         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
         designed 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:
         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
         buffer address and begin DMAing from the wrong location.  This buffer
         copying 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.

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