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     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



     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 downloading 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 file.

     10baseT/UTP           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 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 ifconfig(8).


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

        AOpen/Acer ALN-320
        D-Link DFE520-TX
        D-Link DFE530-TX
        Hawking Technologies PN102TX
        Soekris Engineering net5501


     The following variables are available as sysctl(8) variables:

             Display lots of useful MAC counters maintained in the driver.


     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 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 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 operating system.  If
     you power down your system prior to booting FreeBSD, the card should be configured


     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), polling(4), ifconfig(8)

     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.