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+<table class="head">
+  <tr>
+    <td class="head-ltitle">EHCI(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">EHCI(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">ehci</code> &#x2014; <span class="Nd">USB
+    Enhanced Host Controller driver</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp"><code class="Cd">device ehci</code></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">ehci</code> driver provides support for the
+    USB Enhanced Host Controller Interface, which is used by USB 2.0
+    controllers.</p>
+<p class="Pp">EHCI controllers are peculiar in that they can only handle the USB
+    2.0 protocol. This means that they normally have one or more companion
+    controllers (i.e., <a class="Xr">ohci(4)</a> or <a class="Xr">uhci(4)</a>)
+    handling USB 1.x devices. Consequently each USB connector is electrically
+    connected to two USB controllers. The handling of this is totally automatic,
+    but can be noticed since USB 1.x and USB 2.0 devices plugged in to the same
+    connector appear to connect to different USB buses.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
+  TUNABLES</a></h1>
+<p class="Pp">When the kernel has been compiled with <code class="Cd">options
+    USB_DEBUG</code>, some tunables become available that affect the behavior of
+    <code class="Nm">ehci</code>. These 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.usb.ehci.lostintrbug"><var class="Va">hw.usb.ehci.lostintrbug</var></dt>
+  <dd>This tunable enables the lost interrupt quirk. The default value is 0
+      (off).</dd>
+  <dt id="hw.usb.ehci.iaadbug"><var class="Va">hw.usb.ehci.iaadbug</var></dt>
+  <dd>This tunable enables the EHCI doorbell quirk. The default value is 0
+      (off).</dd>
+  <dt id="hw.usb.ehci.no_hs"><var class="Va">hw.usb.ehci.no_hs</var></dt>
+  <dd>This tunable disables USB devices to attach like HIGH-speed ones and will
+      force all attached devices to attach to the FULL- or LOW-speed companion
+      controller. The default value is 0 (off).</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="hw.usb.ehci.debug"><var class="Va">hw.usb.ehci.debug</var></dt>
+  <dd>Debug output level, where 0 is debugging disabled and larger values
+      increase debug message verbosity. Default is 0.</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">ohci(4)</a>, <a class="Xr">uhci(4)</a>,
+    <a class="Xr">usb(4)</a>, <a class="Xr">xhci(4)</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">ehci</code> device driver first appeared in
+    <span class="Ux">FreeBSD 5.1</span>.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">April 24, 2018</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>