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RE(4)                  FreeBSD Kernel Interfaces Manual                  RE(4)

     re -- RealTek 8139C+/8169/816xS/811xS/8101E PCI/PCIe Ethernet adapter

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

           device miibus
           device re

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


     The re driver provides support for various NICs based on the RealTek
     RTL8139C+, RTL8169, RTL8169S, RTL8110S, RTL8168S, RTL8111S and RTL8101E
     PCI and PCIe Ethernet controllers.

     NICs based on the 8139C+ and 8101E are capable of 10 and 100Mbps speeds
     over CAT5 cable.  NICs based on the 8169, 816xS and 811xS are capable of
     10, 100 and 1000Mbps operation.

     All NICs supported by the re driver have TCP/IP checksum offload and
     hardware VLAN tagging/insertion features, and use a descriptor-based DMA
     mechanism.  They are also capable of TCP large send (TCP segmentation

     The 8139C+ is a single-chip solution combining both a 10/100 MAC and PHY.
     The 8169 is a 10/100/1000 MAC only, requiring a GMII or TBI external PHY.
     The 8169S and 8110S are single-chip devices containing both a 10/100/1000
     MAC and 10/100/1000 copper PHY.  Standalone 10/100/1000 cards are avail-
     able in both 32-bit PCI and 64-bit PCI models.  The 8110S is designed for
     embedded LAN-on-motherboard applications.

     The 8169, 8169S and 8110S also support jumbo frames, which can be config-
     ured via the interface MTU setting.  The MTU is limited to 7422, since
     the chip cannot transmit larger frames.  Selecting an MTU larger than
     1500 bytes with the ifconfig(8) utility configures the adapter to receive
     and transmit jumbo frames.

     The re 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 rc.conf(5).

     10baseT/UTP  Set 10Mbps operation.  The ifconfig(8) mediaopt option can
                  also be used to select either full-duplex or half-duplex

     100baseTX    Set 100Mbps (Fast Ethernet) operation.  The ifconfig(8)
                  mediaopt option can also be used to select either
                  full-duplex or half-duplex modes.

     1000baseTX   Set 1000baseTX operation over twisted pair.  The RealTek
                  gigE chips support 1000Mbps in full-duplex mode only.

     The re driver supports the following media options:

     full-duplex  Force full duplex operation.

     half-duplex  Force half duplex operation.

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

     The re driver supports RealTek RTL8139C+, RTL8169, RTL816xS, RTL811xS,
     and RTL8101E based Fast Ethernet and Gigabit Ethernet adapters including:

     o   Alloy Computer Products EtherGOLD 1439E 10/100 (8139C+)
     o   Compaq Evo N1015v Integrated Ethernet (8139C+)
     o   Corega CG-LAPCIGT Gigabit Ethernet (8169S)
     o   D-Link DGE-528(T) Gigabit Ethernet (8169S)
     o   Gigabyte 7N400 Pro2 Integrated Gigabit Ethernet (8110S)
     o   LevelOne GNC-0105T (8169S)
     o   LinkSys EG1032 (32-bit PCI)
     o   PLANEX COMMUNICATIONS Inc. GN-1200TC (8169S)
     o   Xterasys XN-152 10/100/1000 NIC (8169)

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

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

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

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

     re%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.

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

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

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

     RealTek Semiconductor RTL8139C+, RTL8169, RTL8169S and RTL8110S

     The re device driver first appeared in FreeBSD 5.2.

     The re driver was written by Bill Paul <>.

     The Xterasys XN-152 32-bit PCI NIC, which uses the RTL8169 MAC and Mar-
     vell 88E1000 PHY, has a defect that causes DMA corruption if the board is
     plugged into a 64-bit PCI slot.  The defect lies in the board design, not
     the chip itself: the PCI REQ64# and ACK64# lines should be pulled high,
     but they are not.  The result is that the 8169 chip is tricked into per-
     forming 64-bit DMA transfers even though a 64-bit data path between the
     NIC and the bus does not actually exist.

     Unfortunately, it is not possible to correct this problem in software,
     however it is possible to detect it.  When the re driver is loaded, it
     will run a diagnostic routine designed to validate DMA operation by plac-
     ing the chip in digital loopback mode and initiating a packet transmis-
     sion.  If the card functions properly, the transmitted data will be
     echoed back unmodified.  If the echoed data is corrupt, the driver will
     print an error message on the console and abort the device attach.  The
     user should insure the NIC is installed in a 32-bit PCI slot to avoid
     this problem.

     The RealTek 8169, 8169S and 8110S chips appear to only be capable of
     transmitting jumbo frames up to 7.5K in size.

FreeBSD 6.2                    January 14, 2006                    FreeBSD 6.2


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