static/netbsd/man4/piixpcib.4 4.html


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<table class="head">
  <tr>
    <td class="head-ltitle">PIIXPCIB(4)</td>
    <td class="head-vol">Device Drivers Manual</td>
    <td class="head-rtitle">PIIXPCIB(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">piixpcib</code> &#x2014; <span class="Nd">Intel
    PIIX4 PCI-ISA bridge with SpeedStep</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">piixpcib* at pci? dev ? function ?</code>
  <br/>
  <code class="Cd">isa* at piixpcib?</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">piixpcib</code> driver provides support for
    the Intel PIIX and compatible PCI-ISA Bridges with Intel's first generation
    SpeedStep.</p>
<p class="Pp">Frequency scaling is supported on Pentium III with two voltage
    modes, used by SpeedStep as power states low and high. The driver will
    switch into low power state by reducing voltage and frequency of the CPU.
    The factor depends on the processor itself, but will always reduce power
    consumption about 1/2.</p>
<p class="Pp">The user can manually control the CPU frequency with the
    <a class="Xr">sysctl(8)</a> program using the following node:</p>
<div class="Bd-indent">
<dl class="Bl-tag">
  <dt>machdep.speedstep_state = [0/1]</dt>
  <dd style="width: auto;">&#x00A0;</dd>
</dl>
</div>
</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">est(4)</a>, <a class="Xr">isa(4)</a>,
    <a class="Xr">pci(4)</a>, <a class="Xr">apmd(8)</a>,
    <a class="Xr">sysctl(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">piixpcib</code> driver first appeared in
    <span class="Ux">FreeBSD 5.5</span> and then in <span class="Ux">NetBSD
    4.0</span>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
<p class="Pp">The current <code class="Nm">piixpcib</code> driver was written by
    <span class="An">Bruno Ducrot</span>. It was ported to
    <span class="Ux">NetBSD</span> by <span class="An">Jared D. McNeill</span>
    &lt;<a class="Mt" href="mailto:jmcneill@NetBSD.org">jmcneill@NetBSD.org</a>&gt;.</p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">March 1, 2011</td>
    <td class="foot-os">NetBSD 10.1</td>
  </tr>
</table>