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         kernel configuration file:
               device miibus
               device bge
         Alternatively, to load the driver as a module at boot time, place the
         following line in loader.conf(5):


         The bge driver provides support for various NICs based on the Broadcom
         BCM570x, 571x, 572x, 575x, 576x, 578x, 5776x and 5778x Gigabit Ethernet
         controller chips and the 590x and 5779x Fast Ethernet controller chips.
         All of these NICs are capable of 10, 100 and 1000Mbps speeds over CAT5
         copper cable, except for the SysKonnect SK-9D41 which supports only
         1000Mbps over multimode fiber.  The BCM570x builds upon the technology of
         the Alteon Tigon II.  It has two R4000 CPU cores and is PCI v2.2 and PCI-
         X v1.0 compliant.  It supports IP, TCP and UDP checksum offload for both
         receive and transmit, multiple RX and TX DMA rings for QoS applications,
         rules-based receive filtering, and VLAN tag stripping/insertion as well
         as a 256-bit multicast hash filter.  Additional features may be provided
         via value-add firmware updates.  The BCM570x supports TBI (ten bit inter-
         face) and GMII transceivers, which means it can be used with either cop-
         per or 1000baseX fiber applications.  Note however the device only sup-
         ports a single speed in TBI mode.
         Most BCM5700-based cards also use the Broadcom BCM5401 or BCM5411
         10/100/1000 copper gigabit transceivers, which support autonegotiation of
         10, 100 and 1000Mbps modes in full or half duplex.
         The BCM5700, BCM5701, BCM5702, BCM5703, BCM5704 and BCM5717 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 con-
         figures the adapter to receive and transmit jumbo frames.  Using jumbo
         frames can greatly improve performance for certain tasks, such as file
         transfers and data streaming.
         The bge 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.


         The bge driver provides support for various NICs based on the Broadcom
         BCM570x family of Gigabit Ethernet controller chips, including the fol-
         ?   3Com 3c996-SX (1000baseSX)
         ?   3Com 3c996-T (10/100/1000baseTX)
         ?   Dell PowerEdge 1750 integrated BCM5704C NIC (10/100/1000baseTX)
         ?   Dell PowerEdge 2550 integrated BCM5700 NIC (10/100/1000baseTX)
         ?   Dell PowerEdge 2650 integrated BCM5703 NIC (10/100/1000baseTX)
         ?   Dell PowerEdge R200 integrated BCM5750 NIC (10/100/1000baseTX)
         ?   Dell PowerEdge R300 integrated BCM5722 NIC (10/100/1000baseTX)
         ?   IBM x235 server integrated BCM5703x NIC (10/100/1000baseTX)
         ?   HP Compaq dc7600 integrated BCM5752 NIC (10/100/1000baseTX)
         ?   HP ProLiant NC7760 embedded Gigabit NIC (10/100/1000baseTX)
         ?   HP ProLiant NC7770 PCI-X Gigabit NIC (10/100/1000baseTX)
         ?   HP ProLiant NC7771 PCI-X Gigabit NIC (10/100/1000baseTX)
         ?   HP ProLiant NC7781 embedded PCI-X Gigabit NIC (10/100/1000baseTX)
         ?   Netgear GA302T (10/100/1000baseTX)
         ?   SysKonnect SK-9D21 (10/100/1000baseTX)
         ?   SysKonnect SK-9D41 (1000baseSX)


         The following tunable can be set at the loader(8) prompt before booting
         the kernel, or stored in loader.conf(5).
                 Allow the ASF feature for cooperating with IPMI.  Can cause sys-
                 tem lockup problems on a small number of systems.  Disabled by


         The following variables are available as both sysctl(8) variables and
         loader(8) tunables:
                 Allow collapsing multiple transmit buffers into a single buffer
                 to increase transmit performance with the cost of CPU cycles.
                 The default value is 0 to disable transmit buffer collapsing.
                 Enable UDP transmit checksum offloading even if controller can
                 generate UDP datagrams with checksum value 0.  UDP datagrams with
                 checksum value 0 can confuse receiver host as it means sender did
                 not compute UDP checksum.  The default value is 0 which disables
                 UDP transmit checksum offloading.  The interface need to be
                 brought down and up again before a change takes effect.


         bge%d: couldn't map memory  A fatal initialization error has occurred.
         bge%d: watchdog timeout  The device has stopped responding to the net-
         work, or there is a problem with the network connection (cable).


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


         The bge device driver first appeared in FreeBSD 4.5.


         The bge driver was written by Bill Paul <>.

    BSD November 23, 2010 BSD


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