Date: 13 Aug 2002 23:09:02 -0000 From: David "Siebörger" <drs@rucus.ru.ac.za> To: FreeBSD-gnats-submit@FreeBSD.org Subject: docs/41643: New FAQ entry explaining UDMA ICRC errors Message-ID: <20020813230902.3966.qmail@bashir.dsl.ru.ac.za>
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>Number: 41643
>Category: docs
>Synopsis: New FAQ entry explaining UDMA ICRC errors
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Aug 13 16:10:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: David Siebörger
>Release: FreeBSD 4.6-STABLE i386
>Organization:
Rhodes University Computer Users Society
>Environment:
System: FreeBSD bashir.dsl.ru.ac.za 4.6-STABLE FreeBSD 4.6-STABLE #11: Tue Aug 6 10:43:06 SAST 2002 drs@bashir.dsl.ru.ac.za:/usr/obj/usr/src/sys/BASHIR i386
>Description:
This is one that I've experienced a few times myself and has come up on
-questions and -hardware many times.
>How-To-Repeat:
>Fix:
--- book.sgml.diff begins here ---
--- doc/en_US.ISO8859-1/books/faq/book.sgml.orig Wed Aug 14 00:42:32 2002
+++ doc/en_US.ISO8859-1/books/faq/book.sgml Wed Aug 14 00:58:09 2002
@@ -4363,6 +4363,39 @@
and connections.</para>
</answer>
</qandaentry>
+
+ <qandaentry>
+ <question id="udma-icrc">
+ <para>What are <quote>UDMA ICRC</quote> errors, and how do I
+ fix them?</para>
+ </question>
+
+ <answer>
+ <para>The &man.ata.4; driver reports <quote>UDMA ICRC</quote>
+ errors when a DMA transfer to or from a drive is corrupted.
+ The driver will retry the operation a few times. Should
+ the retries fail, it will switch from DMA to the slower PIO
+ mode of communication with the device.</para>
+ <para>The problem can be caused by many factors, although
+ perhaps the most common cause is faulty or incorrect
+ cabling. Check that the ATA cables are undamaged and rated
+ for the Ultra DMA mode in use. If you're using removable
+ drive trays, they must also be compatible. Be sure that
+ all connections are making good contact. Problems have
+ also been noticed when an old drive is installed on the
+ same ATA channel as an Ultra DMA 66 (or faster) drive.
+ Lastly, these errors can indicate that the drive is
+ failing. Most drive vendors provide testing software for
+ their drives, so test your drive, and, if necessary, back
+ up your data and replace it.</para>
+ <para>The &man.atacontrol.8; utility can be used to show and
+ select the DMA or PIO modes used for each ATA device. In
+ particular, <command>atacontrol mode
+ <replaceable>channel</replaceable></command> will show the
+ modes in use on a particular ATA channel, where the primary
+ channel is numbered 0, and so on.</para>
+ </answer>
+ </qandaentry>
</qandaset>
</chapter>
--- book.sgml.diff ends here ---
>Release-Note:
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