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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:15 -0400
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+<table class="head">
+ <tr>
+ <td class="head-ltitle">CMDIDE(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">CMDIDE(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">cmdide</code> &#x2014; <span class="Nd">CMD
+ Technology and Silicon Image IDE disk controllers 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">cmdide* at pci? dev ? function ? flags
+ 0x0000</code>
+ <br/>
+ <code class="Cd">options PCIIDE_CMD064x_DISABLE</code>
+ <br/>
+ <code class="Cd">options PCIIDE_CMD0646U_ENABLEUDMA</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">cmdide</code> driver supports the CMD
+ Technology PCI0640, PCI0643, PCI0646, PCI0648, PCI0649, and Silicon Image
+ 0680 IDE controllers, and provides the interface with the hardware for the
+ <a class="Xr">ata(4)</a> driver.</p>
+<p class="Pp">The 0x0002 flag forces the <code class="Nm">cmdide</code> driver
+ to disable DMA on chipsets for which DMA would normally be enabled. This can
+ be used as a debugging aid, or to work around problems where the IDE
+ controller is wired up to the system incorrectly.</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">ata(4)</a>, <a class="Xr">atapi(4)</a>,
+ <a class="Xr">intro(4)</a>, <a class="Xr">pci(4)</a>,
+ <a class="Xr">pciide(4)</a>, <a class="Xr">wd(4)</a>,
+ <a class="Xr">wdc(4)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">There's no way to reliably know if a PCI064x controller is enabled
+ or not. If the driver finds a PCI064x, it will assume it is enabled unless
+ the PCIIDE_CMD064x_DISABLE option is specified in the kernel config file.
+ This will be a problem only if the controller has been disabled in the BIOS
+ and another controller has been installed and uses the ISA legacy I/O ports
+ and interrupts.</p>
+<p class="Pp">The PCI0646U controller is known to be buggy with Ultra-DMA
+ transfers, so Ultra-DMA is disabled by default for this controller. To
+ enable Ultra-DMA, use the PCIIDE_CMD0646U_ENABLEUDMA option. Ultra-DMA can
+ eventually be disabled on a per-drive basis with config flags, see
+ <a class="Xr">wd(4)</a>.</p>
+<p class="Pp">The timings used for the PIO and DMA modes for controllers listed
+ above are for a PCI bus running at 30 or 33 MHz. This driver may not work
+ properly on overclocked systems.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">December 13, 2003</td>
+ <td class="foot-os">NetBSD 10.1</td>
+ </tr>
+</table>