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-<table class="head">
- <tr>
- <td class="head-ltitle">UMASS(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">UMASS(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">umass</code> &#x2014; <span class="Nd">USB Mass
- Storage Devices 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 da</code>
- <br/>
- <code class="Cd">device scbus</code>
- <br/>
- <code class="Cd">device pass</code>
- <br/>
- <code class="Cd">device usb</code>
- <br/>
- <code class="Cd">device umass</code></p>
-<p class="Pp">In <a class="Xr">loader.conf(5)</a>:
- <br/>
- <code class="Cd">umass_load</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">umass</code> driver provides support for Mass
- Storage devices that attach to the USB interface.</p>
-<p class="Pp">If the appropriate hardware is detected, the driver will be loaded
- automatically by <a class="Xr">devmatch(8)</a>. To load the driver manually
- at boot time, use the <code class="Cm">umass_load</code> command at the
- <a class="Xr">loader(8)</a> prompt, or add it to
- <a class="Xr">loader.conf(5)</a>.</p>
-<p class="Pp">To use the driver in a custom kernel, <a class="Xr">usb(4)</a> and
- at least one of <a class="Xr">uhci(4)</a>, <a class="Xr">ohci(4)</a>,
- <a class="Xr">ehci(4)</a>, or <a class="Xr">xhci(4)</a> must be configured
- in the kernel. Additionally, since <code class="Nm">umass</code> uses the
- SCSI subsystem and sometimes acts as a SCSI device, it requires
- <a class="Xr">da(4)</a> and <a class="Xr">scbus(4)</a> to be included in the
- kernel.</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">umass</code> driver supports USB Mass Storage
- devices such as:</p>
-<p class="Pp"></p>
-<ul class="Bl-bullet Bl-compact">
- <li>USB thumb drives</li>
- <li>USB hard disk drives</li>
- <li>USB floppy drives</li>
-</ul>
-<p class="Pp" id="USB">The <code class="Nm">umass</code> driver tries its best
- to avoid issues with the drives, not all issues can be handled
- automatically, so quirks may be necessary. See the
- <a class="permalink" href="#USB"><i class="Em">USB Mass Sotrage
- quirks</i></a> section of <a class="Xr">usb_quirk(4)</a> for quirks for the
- drives. The <code class="Cd">add_dev_quirk_vplh</code> and
- <code class="Cd">add_quirk</code> commands of <a class="Xr">usbconfig(8)</a>
- can manage these dynamically. Quirks can be specified via tuables, as
- described in <a class="Xr">usb_quirk(4)</a>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
-<p class="Pp">Rescan all slots on a multi-slot flash reader, where the slots map
- to separate LUNs on a single SCSI ID:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>camcontrol rescan 0:0:0
-camcontrol rescan 0:0:1
-camcontrol rescan 0:0:2
-camcontrol rescan 0:0:3</pre>
-</div>
-<p class="Pp">Typically only the first slot will be enabled at boot time. This
- assumes that the flash reader is the first SCSI bus in the system and has 4
- slots.</p>
-</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">cfumass(4)</a>, <a class="Xr">ehci(4)</a>,
- <a class="Xr">ohci(4)</a>, <a class="Xr">uhci(4)</a>,
- <a class="Xr">usb(4)</a>, <a class="Xr">usb_quirk(4)</a>,
- <a class="Xr">xhci(4)</a>, <a class="Xr">camcontrol(8)</a>,
- <a class="Xr">usbconfig(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">umass</code> driver appeared in
- <span class="Ux">FreeBSD 4.3</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">umass</code> driver was written by
- <span class="An">MAEKAWA Masahide</span>
- &lt;<a class="Mt" href="mailto:bishop@rr.iij4u.or.jp">bishop@rr.iij4u.or.jp</a>&gt;
- and <span class="An">Nick Hibma</span>
- &lt;<a class="Mt" href="mailto:n_hibma@FreeBSD.org">n_hibma@FreeBSD.org</a>&gt;.</p>
-<p class="Pp">This manual page was written by <span class="An">Nick Hibma</span>
- &lt;<a class="Mt" href="mailto:n_hibma@FreeBSD.org">n_hibma@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">November 28, 2025</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>