static/netbsd/man4/man4.amiga/ahsc.4 3.html


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<table class="head">
  <tr>
    <td class="head-ltitle">AHSC(4)</td>
    <td class="head-vol">Device Drivers Manual (amiga)</td>
    <td class="head-rtitle">AHSC(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">ahsc</code> &#x2014; <span class="Nd">A3000 low
    level SCSI 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">ahsc0 at mainbus0</code></p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The Amiga architecture uses a common machine independent scsi
    sub-system provided in the kernel source. The machine independent drivers
    that use this code access the hardware through a common interface. (see
    <a class="Xr">scsibus(4)</a>) This common interface interacts with a machine
    dependent interface, such as <code class="Nm">ahsc</code>, which then
    handles the hardware specific issues.</p>
<p class="Pp">The <code class="Nm">ahsc</code> interface handles things such as
    DMA and interrupts as well as actually sending commands, negotiating
    synchronous or asynchronous transfers and handling disconnect/reconnect of
    SCSI targets. The hardware that <code class="Nm">ahsc</code> uses is based
    on the WD33c93 SCSI chip.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
<dl class="Bl-diag">
  <dt>sbicwait TIMEO @%d with asr=x%x csr=x%x</dt>
  <dd>The 33c93 code (sbic) has been waiting too long for a SCSI chip operation
      to complete. %d is the line in the source file
      <span class="Pa">amiga/dev/sbic.c</span> at which the SCSI chip timed-out.
      Asr and csr are status registers within the SCSI chip.</dd>
  <dt>ahsc%d: abort %s: csr = 0x%02x, asr = 0x%02x</dt>
  <dd>A SCSI operation %s was aborted due to an error.</dd>
  <dt>ahsc%d: csr == 0x%02i</dt>
  <dd>A error has occurred within the SCSI chip code.</dd>
  <dt>ahsc%d: unexpected phase %d in icmd from %d</dt>
  <dd>The target described by &#x2018;from %d&#x2019; has taken the SCSI bus
      into a phase which is not expected during polled IO.</dd>
  <dt>ahsc%d: unexpected phase %d in icmd from %d</dt>
  <dd>The target described by &#x2018;from %d&#x2019; has taken the SCSI bus
      into a phase which is not expected during DMA IO setup.</dd>
</dl>
</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">scsibus(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">ahsc</code> interface first appeared in
    <span class="Ux">NetBSD 1.0</span></p>
</section>
</div>
<table class="foot">
  <tr>
    <td class="foot-date">August 31, 1994</td>
    <td class="foot-os">NetBSD 10.1</td>
  </tr>
</table>