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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>