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-<table class="head">
- <tr>
- <td class="head-ltitle">GIO(4)</td>
- <td class="head-vol">Device Drivers Manual (sgimips)</td>
- <td class="head-rtitle">GIO(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">gio</code> &#x2014; <span class="Nd">SGI's
- Graphics I/O (GIO) bus (an early PCI-like bus)</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">gio0 at imc0</code>
- <br/>
- <code class="Cd">gio0 at pic0</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">gio</code> bus is a bus for connecting
- high-speed peripherals to the main memory and CPU. The devices themselves
- are typically (but not necessarily) connected to the
- <a class="Xr">sgimips/hpc(4)</a> peripheral controller, and memory and CPU
- are accessed through the <a class="Xr">sgimips/imc(4)</a> (Indy Memory
- Controller) or <a class="Xr">sgimips/pic(4)</a> (Processor Interface
- Controller). The <code class="Nm">gio</code> bus is found on the Personal
- Iris 4D/3x, Indigo, Indy, Challenge S, Challenge M, and Indigo2 machines and
- exists in three incarnations: GIO32, GIO32-bis, and GIO64.</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">sgimips/giopci(4)</a>,
- <a class="Xr">sgimips/grtwo(4)</a>, <a class="Xr">sgimips/hpc(4)</a>,
- <a class="Xr">sgimips/imc(4)</a>, <a class="Xr">sgimips/light(4)</a>,
- <a class="Xr">sgimips/newport(4)</a>, <a class="Xr">sgimips/pic(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">gio</code> driver first appeared in
- <span class="Ux">NetBSD 1.5</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
-<p class="Pp">Challenge S systems may use only one <code class="Nm">gio</code>
- DMA-capable expansion card, despite having two slots. Cards based on the
- <a class="Xr">sgimips/hpc(4)</a> controller, such as the GIO32 scsi and E++
- Ethernet adapters, must be placed in slot 1 (closest to the side of the
- case). All other cards must be placed in slot 0 (adjacent to the memory
- banks).</p>
-<p class="Pp">Indigo2 and Challenge M systems contain either three or four GIO64
- connectors, depending on the model. However, in both cases only two
- electrically distinct slots are present. Therefore, distinct expansion cards
- may not share physical connectors associated with the same slot. Refer to
- the PCB stencils to determine the association between physical connectors
- and slots.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Systems employing the <a class="Xr">sgimips/imc(4)</a> may
- experience spurious SysAD bus parity errors when using expansion cards,
- which do not drive all data lines during a CPU PIO read. The only workaround
- is to disable SysAD parity checking when using such cards.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">February 17, 2017</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>