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-<table class="head">
- <tr>
- <td class="head-ltitle">HDH(4)</td>
- <td class="head-vol">Device Drivers Manual (vax)</td>
- <td class="head-rtitle">HDH(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">hdh</code> &#x2014; <span class="Nd">ACC
- IF-11/HDH IMP network interface</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">pseudo-device imp</code>
- <br/>
- <code class="Cd">hdh0 at uba0 csr 166740 vector hdhintr</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">NOTE: This driver has not been ported from
- <span class="Ux">4.4BSD</span> yet.</p>
-<p class="Pp">NOTE: At the moment, <span class="Ux">NetBSD</span> does not
- support IMP, so this manual page is not relevant.</p>
-<p class="Pp" id="pseudo-device">The <code class="Nm">hdh</code> device provides
- an HDLC Host (HDH) interface to an IMP. It is normally used when
- participating in the DARPA Internet. The controller itself is not accessible
- to users, but instead provides the hardware support to the IMP interface
- described in <a class="Xr">imp(4)</a>. The configuration entry for the IMP
- must also include the
- <a class="permalink" href="#pseudo-device"><i class="Em">pseudo-device</i></a>
- as shown above in the <a class="Sx" href="#SYNOPSIS">SYNOPSIS</a>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
-<dl class="Bl-diag">
- <dt>hdh%d: not alive.</dt>
- <dd>The initialization routine was entered even though the device did not
- autoconfigure. This indicates a system problem.</dd>
- <dt>hdh%d: cannot get chan %d uba resources.</dt>
- <dd>Insufficient UNIBUS resources existed to initialize the device. This is
- likely to be a shortage of UNIBUS mapping registers.</dd>
- <dt>hdh%d: LINE UP.</dt>
- <dd>This indicates that both the HDLC and HDH protocols have declared the link
- to the IMP alive.</dd>
- <dt>hdh%d: LINE DOWN.</dt>
- <dd>This indicates that the link to the IMP has died.</dd>
- <dt>hdh%d: TIMEOUT.</dt>
- <dd></dd>
- <dt>hdh%d: HOST DATA ERROR.</dt>
- <dd></dd>
- <dt>hdh%d: IMP SEQUENCE ERROR.</dt>
- <dd></dd>
- <dt>hdh%d: HOST SEQUENCE ERROR.</dt>
- <dd>These errors indicate that an HDH protocol error has been detected.</dd>
- <dt id="mbuf">hdh%d: cannot get supervisor cmnd buffer.</dt>
- <dd>This error indicates that an
- <a class="permalink" href="#mbuf"><i class="Em">mbuf</i></a> could not be
- allocated to send a command to the IF-11/HDH.</dd>
-</dl>
-<p class="Pp">Any other error message from hdh%d: indicates a serious error
- detected by either the driver or the IF-11/HDH firmware.</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">netintro(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">hdh</code> driver appeared in
- <span class="Ux">4.3BSD</span>.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">June 5, 1993</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>