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+<table class="head">
+  <tr>
+    <td class="head-ltitle">BGE(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">BGE(4)</td>
+  </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">bge</code> &#x2014; <span class="Nd">Broadcom
+    BCM57xx/BCM590x Gigabit/Fast Ethernet driver</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following lines
+    in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device miibus</code>
+<br/>
+<code class="Cd">device bge</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+    the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>if_bge_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">bge</code> 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.</p>
+<p class="Pp">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 interface) and GMII
+    transceivers, which means it can be used with either copper or 1000baseX
+    fiber applications. Note however the device only supports a single speed in
+    TBI mode.</p>
+<p class="Pp">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.</p>
+<p class="Pp">The BCM5700, BCM5701, BCM5702, BCM5703, BCM5704, BCM5714, BCM5717,
+    BCM5719, BCM5720, BCM5780 and BCM57765 also support jumbo frames, which can
+    be configured via the interface MTU setting. Selecting an MTU larger than
+    1500 bytes with the <a class="Xr">ifconfig(8)</a> utility configures 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.</p>
+<p class="Pp">The <code class="Nm">bge</code> driver supports the following
+    media types:</p>
+<dl class="Bl-tag">
+  <dt id="autoselect"><a class="permalink" href="#autoselect"><code class="Cm">autoselect</code></a></dt>
+  <dd>Enable autoselection of the media type and options. The user can manually
+      override the autoselected mode by adding media options to
+      <a class="Xr">rc.conf(5)</a>.</dd>
+  <dt id="10baseT/UTP"><a class="permalink" href="#10baseT/UTP"><code class="Cm">10baseT/UTP</code></a></dt>
+  <dd>Set 10Mbps operation. The <a class="Xr">ifconfig(8)</a>
+      <code class="Ic">mediaopt</code> option can also be used to select either
+      <code class="Cm">full-duplex</code> or <code class="Cm">half-duplex</code>
+      modes.</dd>
+  <dt id="100baseTX"><a class="permalink" href="#100baseTX"><code class="Cm">100baseTX</code></a></dt>
+  <dd>Set 100Mbps (Fast Ethernet) operation. The <a class="Xr">ifconfig(8)</a>
+      <code class="Ic">mediaopt</code> option can also be used to select either
+      <code class="Cm">full-duplex</code> or <code class="Cm">half-duplex</code>
+      modes.</dd>
+  <dt id="1000baseTX"><a class="permalink" href="#1000baseTX"><code class="Cm">1000baseTX</code></a></dt>
+  <dd>Set 1000baseTX operation over twisted pair. Only
+      <code class="Cm">full-duplex</code> mode is supported.</dd>
+  <dt id="1000baseSX"><a class="permalink" href="#1000baseSX"><code class="Cm">1000baseSX</code></a></dt>
+  <dd>Set 1000Mbps (Gigabit Ethernet) operation. Both
+      <code class="Cm">full-duplex</code> and
+      <code class="Cm">half-duplex</code> modes are supported.</dd>
+</dl>
+<p class="Pp">The <code class="Nm">bge</code> driver supports the following
+    media options:</p>
+<dl class="Bl-tag">
+  <dt id="full-duplex"><a class="permalink" href="#full-duplex"><code class="Cm">full-duplex</code></a></dt>
+  <dd>Force full duplex operation.</dd>
+  <dt id="half-duplex"><a class="permalink" href="#half-duplex"><code class="Cm">half-duplex</code></a></dt>
+  <dd>Force half duplex operation.</dd>
+</dl>
+<p class="Pp">For more information on configuring this device, see
+    <a class="Xr">ifconfig(8)</a>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
+<p class="Pp">The <code class="Nm">bge</code> driver provides support for
+    various NICs based on the Broadcom BCM570x family of Gigabit Ethernet
+    controller chips, including the following:</p>
+<p class="Pp"></p>
+<ul class="Bl-bullet Bl-compact">
+  <li>3Com 3c996-SX (1000baseSX)</li>
+  <li>3Com 3c996-T (10/100/1000baseTX)</li>
+  <li>Apple Thunderbolt Display (10/100/1000baseTX)</li>
+  <li>Apple Thunderbolt to Gigabit Ethernet Adapter (10/100/1000baseTX)</li>
+  <li>Dell PowerEdge 1750 integrated BCM5704C NIC (10/100/1000baseTX)</li>
+  <li>Dell PowerEdge 2550 integrated BCM5700 NIC (10/100/1000baseTX)</li>
+  <li>Dell PowerEdge 2650 integrated BCM5703 NIC (10/100/1000baseTX)</li>
+  <li>Dell PowerEdge R200 integrated BCM5750 NIC (10/100/1000baseTX)</li>
+  <li>Dell PowerEdge R300 integrated BCM5722 NIC (10/100/1000baseTX)</li>
+  <li>IBM x235 server integrated BCM5703x NIC (10/100/1000baseTX)</li>
+  <li>HP Compaq dc7600 integrated BCM5752 NIC (10/100/1000baseTX)</li>
+  <li>HP ProLiant NC7760 embedded Gigabit NIC (10/100/1000baseTX)</li>
+  <li>HP ProLiant NC7770 PCI-X Gigabit NIC (10/100/1000baseTX)</li>
+  <li>HP ProLiant NC7771 PCI-X Gigabit NIC (10/100/1000baseTX)</li>
+  <li>HP ProLiant NC7781 embedded PCI-X Gigabit NIC (10/100/1000baseTX)</li>
+  <li>Netgear GA302T (10/100/1000baseTX)</li>
+  <li>SysKonnect SK-9D21 (10/100/1000baseTX)</li>
+  <li>SysKonnect SK-9D41 (1000baseSX)</li>
+</ul>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
+  TUNABLES</a></h1>
+<p class="Pp">The following tunables can be set at the
+    <a class="Xr">loader(8)</a> prompt before booting the kernel, or stored in
+    <a class="Xr">loader.conf(5)</a>.</p>
+<dl class="Bl-tag">
+  <dt id="hw.bge.allow_asf"><var class="Va">hw.bge.allow_asf</var></dt>
+  <dd>Allow the ASF feature for cooperating with IPMI. Can cause system lockup
+      problems on a small number of systems. Enabled by default.</dd>
+  <dt id="dev.bge._d.msi"><var class="Va">dev.bge.%d.msi</var></dt>
+  <dd>Non-zero value enables MSI support on the Ethernet hardware. The default
+      value is 1.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
+  VARIABLES</a></h1>
+<p class="Pp">The following variables are available as both
+    <a class="Xr">sysctl(8)</a> variables and <a class="Xr">loader(8)</a>
+    tunables:</p>
+<dl class="Bl-tag">
+  <dt id="dev.bge._d.forced_collapse"><var class="Va">dev.bge.%d.forced_collapse</var></dt>
+  <dd>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.</dd>
+  <dt id="dev.bge._d.forced_udpcsum"><var class="Va">dev.bge.%d.forced_udpcsum</var></dt>
+  <dd>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.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
+<dl class="Bl-diag">
+  <dt>bge%d: couldn't map memory</dt>
+  <dd>A fatal initialization error has occurred.</dd>
+  <dt>bge%d: couldn't map ports</dt>
+  <dd>A fatal initialization error has occurred.</dd>
+  <dt>bge%d: couldn't map interrupt</dt>
+  <dd>A fatal initialization error has occurred.</dd>
+  <dt>bge%d: no memory for softc struct!</dt>
+  <dd>The driver failed to allocate memory for per-device instance information
+      during initialization.</dd>
+  <dt>bge%d: failed to enable memory mapping!</dt>
+  <dd>The driver failed to initialize PCI shared memory mapping. This might
+      happen if the card is not in a bus-master slot.</dd>
+  <dt>bge%d: firmware handshake timed out, found 0xffffffff</dt>
+  <dd>The device was physically disconnected from the system, or there is a
+      problem with the device causing it to stop responding to the host it is
+      attached to.</dd>
+  <dt>bge%d: no memory for jumbo buffers!</dt>
+  <dd>The driver failed to allocate memory for jumbo frames during
+      initialization.</dd>
+  <dt>bge%d: watchdog timeout</dt>
+  <dd>The device has stopped responding to the network, or there is a problem
+      with the network connection (cable).</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+  ALSO</a></h1>
+<p class="Pp"><a class="Xr">altq(4)</a>, <a class="Xr">arp(4)</a>,
+    <a class="Xr">miibus(4)</a>, <a class="Xr">netintro(4)</a>,
+    <a class="Xr">ng_ether(4)</a>, <a class="Xr">polling(4)</a>,
+    <a class="Xr">vlan(4)</a>, <a class="Xr">ifconfig(8)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="Nm">bge</code> device driver first appeared in
+    <span class="Ux">FreeBSD 4.5</span>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp">The <code class="Nm">bge</code> driver was written by
+    <span class="An">Bill Paul</span>
+    &lt;<a class="Mt" href="mailto:wpaul@windriver.com">wpaul@windriver.com</a>&gt;.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">Hotplug is not currently supported in
+    <span class="Ux">FreeBSD</span>, hence, Thunderbolt interfaces need to be
+    connected prior to system power up on Apple systems in order for the
+    interface to be detected. Also, due to the lack of hotplug support,
+    Thunderbolt-based interfaces must not be removed while the system is up as
+    the kernel is currently unable to cope with a <code class="Nm">bge</code>
+    interface disappearing.</p>
+<p class="Pp">The UDP transmit checksum offloading is disabled by default, see
+    <var class="Va">dev.bge.%d.forced_udpcsum</var>. To avoid problems when the
+    interface is a member of a <a class="Xr">bridge(4)</a> interface, all
+    transmit checksum offloading is initially disabled in this case. Transmit
+    checksum offloading can be enabled using <a class="Xr">ifconfig(8)</a>.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">January 16, 2026</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>