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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">PCWEASEL(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">PCWEASEL(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">pcweasel</code> &#x2014; <span class="Nd">Support
- for the PC-Weasel serial console board</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">pseudo-device pcweasel</code>
- <br/>
- <code class="Cd">weasel* at pci? dev ? function ?</code></p>
-<p class="Pp">Note that the appropriate display device must also be enabled. See
- <a class="Xr">pcdisplay(4)</a> for more information.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The PC-Weasel is a serial console board for use primarily on
- Intel-based PC-class systems. It addresses a problem that nearly everyone
- who has deployed a PC-class server has experienced: the total lack of remote
- management capability on PC-class hardware.</p>
-<p class="Pp">In addition to serial console support, the PC-Weasel provides the
- ability to remotely reset the system (by means of a hardware reset signal),
- and provides a watchdog timer function.</p>
-<p class="Pp">The PC-Weasel works by emulating the original IBM Monochrome
- Display Adapter (MDA). Writes to the display's character cells are
- translated into ANSI terminal sequences which are then sent out the
- PC-Weasel's serial port. Incoming characters are translated into PC keyboard
- scan codes and then fed (by means of a cable) into the system's keyboard
- controller. The system believes it is using a display console. This is
- particularly important in the event that one needs access to BIOS
- configuration menus.</p>
-<p class="Pp" id="com0">The PC-Weasel also includes a ST16550 serial port, which
- may be configured as any one of the system's serial ports. Typical usage is
- to configure the port as
- <a class="permalink" href="#com0"><i class="Em">com0</i></a> at ISA I/O
- address 0x3f8. When the PC-Weasel detects activity on the ST16550, the
- serial port is automatically connected to the ST16550 so that the serial
- port may be used as normal. When the PC-Weasel detects activity on the
- internal UART used for MDA emulation, the serial port is automatically
- reconnected to the emulation UART. This allows the boot program and kernel
- to be configured to use the serial port directly (which is more efficient
- than using the MDA emulation mode), yet allows the MDA emulation to be
- reestablished as soon as the kernel loses control of the system.</p>
-<p class="Pp">The <code class="Nm">pcweasel</code> driver provides support for
- the additional features present on the PC-Weasel. At the moment, this
- includes support for the watchdog timer function. Use of the
- <code class="Nm">pcweasel</code> driver is not required in order for the
- system to function with a PC-Weasel installed so long as only the MDA
- emulation and ST16550 serial port functionality is required.</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">pcdisplay(4)</a>, <a class="Xr">wdogctl(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">pcweasel</code> driver first appeared in
- <span class="Ux">NetBSD 1.5.1</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The PC-Weasel was invented by Herb Peyerl and Jonathan Levine at
- Canada Connect Corporation.</p>
-<p class="Pp">The <code class="Nm">pcweasel</code> driver was written by
- <span class="An">Jason R. Thorpe</span> &#x27E8;thorpej@zembu.com&#x27E9;,
- and contributed by Zembu Labs, Inc. Herb Peyerl of Middle Digital, Inc.
- provided several firmware updates during the development of the driver.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">November 23, 2007</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>