Date: Mon, 12 Nov 2001 15:06:16 -0500 (EST) From: mwlucas@blackhelicopters.org To: FreeBSD-gnats-submit@freebsd.org Subject: docs/31935: FAQ: AIC7xxx termination Message-ID: <200111122006.PAA30299@blackhelicopters.org>
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>Number: 31935
>Category: docs
>Synopsis: FAQ: AIC7xxx termination
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Mon Nov 12 12:10:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Michael Lucas
>Release: FreeBSD 3.5-STABLE i386
>Organization:
None
>Environment:
today's -doc tree
>Description:
Here's an error generated by the AIC7xxx controller in certain
circumstances.
This answer was actually written by Justin Gibbs, just marked up &
send-pr'd by yours truly.
>How-To-Repeat:
Get a motherboard with a built-in AIC7xxx controller. Play with the
BIOS until it breaks.
>Fix:
*** en_US.ISO8859-1/books/faq/book.sgml-dist Mon Nov 12 14:26:43 2001
--- en_US.ISO8859-1/books/faq/book.sgml Mon Nov 12 15:02:07 2001
***************
*** 3913,3918 ****
--- 3913,3941 ----
</qandaentry>
<qandaentry>
+ <question id="aci0-illegal-cable">
+ <para>When I boot my system, I get the error
+ <errorname>ahc0: illegal cable configuration</errorname>.
+ My cabling is correct. What's going on?</para>
+ </question>
+
+ <answer>
+ <para>Your motherboard lacks the external logic to support
+ automatic termination. Switch your SCSI BIOS to specify
+ the correct termination for your configuration rather
+ than automatic termination. The AIC7XXX driver cannot
+ determine if the external logic for cable detection (and
+ thus auto-termination) is available. The driver simply
+ assumes that this support must exist if the configuration
+ contained in the serial EEPROM is set to "automatic
+ termination". Without the external cable detection logic
+ the driver will often configure termination incorrectly,
+ which can compromise the reliability of the SCSI
+ bus.</para>
+ </answer>
+ </qandaentry>
+
+ <qandaentry>
<question id="mail-loopback">
<para>Why does Sendmail give me an error reading
<quote><errorname>mail loops back to
>Release-Note:
>Audit-Trail:
>Unformatted:
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