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

     re - RealTek 8139C+/8169/8169S/8110S PCI ethernet adapter driver

     device miibus
     device re

     The re driver provides support for various NICs based on the RealTek
     RTL8139C+, RTL8169, RTL8169S and RTL8110S PCI ethernet controllers,
     including the following:

     +o   Alloy Computer Products EtherGOLD 1439E 10/100 (8139C+)
     +o   Compaq Evo N1015v Integrated Ethernet (8139C+)
     +o   Gigabyte 7N400 Pro2 Integrated Gigabit Ethernet (8110S)
     +o   Xterasys XN-152 10/100/1000 NIC (8169)

     NICs based on the 8139C+ are capable of 10 and 100Mbps speeds over CAT5
     cable. NICs based on the 8169, 8169S and 8110S 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
     available 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
     configured via the interface MTU setting.  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).

     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), netintro(4), ng_ether(4), vlan(4), ifconfig(8)

     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
     Marvell 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
     performing 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
     placing the chip in digital loopback mode and initiating a packet
     transmission. 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 11.0-PRERELEASE        September 4, 2003       FreeBSD 11.0-PRERELEASE


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