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-<table class="head">
- <tr>
- <td class="head-ltitle">OFW_CONSOLE(4)</td>
- <td class="head-vol">Device Drivers Manual (powerpc)</td>
- <td class="head-rtitle">OFW_CONSOLE(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">ofw_console</code> &#x2014; <span class="Nd">Open
- Firmware console</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">cpu AIM</code>
- <br/>
- <code class="Cd">options OFWCONS_POLL_HZ=N</code></p>
-<p class="Pp">
- <br/>
- <code class="Cd">options KDB</code>
- <br/>
- <code class="Cd">options DDB</code>
- <br/>
- <code class="Cd">options ALT_BREAK_TO_DEBUGGER</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">ofw_console</code> driver provides a simple
- text console, using the Open Firmware services for input and output. It will
- use the Open Firmware console devices set via the
- <var class="Va">input-device</var> and <var class="Va">output-device</var>
- variables.</p>
-<p class="Pp">This driver is deprecated and only provided as a fallback console
- mechanism if the real console hardware can not be driven by
- <span class="Ux">FreeBSD</span>.</p>
-<p class="Pp">In case the <code class="Nm">ofw_console</code> console appears to
- work too slowly, its responsiveness probably can be improved by including
- <code class="Cd">options OFWCONS_POLL_HZ=N</code>. When omitted,
- <code class="Dv">OFWCONS_POLL_HZ</code> defaults to 4. For example, on Sun
- Ultra 2 a value of 20 or higher works best. Too high values, on the other
- hand, can cause <code class="Nm">ofw_console</code> to unnecessarily consume
- CPU.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag Bl-compact">
- <dt><span class="Pa">/dev/console</span></dt>
- <dd style="width: auto;">&#x00A0;</dd>
- <dt><span class="Pa">/dev/keyboard</span></dt>
- <dd>terminal input device in case the console input device is the
- keyboard</dd>
- <dt><span class="Pa">/dev/screen</span></dt>
- <dd>terminal output device in case the console output device is the
- screen</dd>
- <dt><span class="Pa">/dev/tty[a-z]</span></dt>
- <dd>terminal device in case both the console input and output device is
- tty[a-z]</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">akbd(4)</a>, <a class="Xr">powermac_nvram(4)</a>,
- <a class="Xr">vt(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">ofw_console</code> driver first appeared in
- <span class="Ux">FreeBSD 5.0</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">ofw_console</code> driver was written by
- <span class="An">Benno Rice</span>
- &lt;<a class="Mt" href="mailto:benno@FreeBSD.org">benno@FreeBSD.org</a>&gt;.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
-<p class="Pp">Since the Open Firmware will handle BREAK (or Stop-A) sequences
- before <code class="Nm">ofw_console</code>, the preferred way to enter
- <a class="Xr">ddb(4)</a> when using <code class="Nm">ofw_console</code> is
- to include <code class="Cd">options ALT_BREAK_TO_DEBUGGER</code> in a
- ddb-enabled kernel, and enter the alternate BREAK sequence (RETURN TILDE
- CTRL-b).</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">The <code class="Nm">ofw_console</code> driver also not attach to
- the hardware resources it actually talks to.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">January 16, 2021</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>