Path: utzoo!attcan!uunet!lll-winken!uwm.edu!wuarchive!mit-eddie!bloom-beacon!eru!hagbard!sunic!mcsun!ukc!reading!minster!martin
From: martin@minster.york.ac.uk
Newsgroups: comp.os.minix
Subject: Timing problem with at_wini and WD1006V-SR2?
Message-ID: <656434996.2098@minster.york.ac.uk>
Date: 20 Oct 90 15:03:16 GMT
Organization: Department of Computer Science, University of York, England
Lines: 41

Hello!
   I am having trouble with the minix at_wini driver on
a Viglen Vig III LS clone. Most of the time it is OK,
but if I do something like:

	dd if=/dev/hd3 of=/dev/null bs=30k

then the machine will usually hang quite quickly, with
the hard disk light perminantly *on*, but with no disk
activity at all!

The bigger the block size, the more likely the machine is
to crash! Also turning off turbo mode seems to make the
crash less likely, but does not avoid it altogether.
This makes me wonder if there is a timing incompatibility
between the at_wini driver and the Western Digital
WD1006V-SR2 RLL disk controller.

Has anyone seen this problem before, or have any suggestions?

To give more details, the machine is a 20MHz 386 clone,
and I have duplicated the problem using both Minix 1.5.10,
and with Bruce Evan's 32-bit patchs installed.
Identical boot floppies work without a problem on a 25MHz
386 box with a WD1006V-MM2 (or at least, did until I
installed a SCSI disk last week!)

Many thanks in advance!

Martin

usenet: ...!mcsun!ukc!minster!martin
JANET:  martin@uk.ac.york.minster
INTERNET: martin%minster.york.ac.uk@nsfnet-relay.ac.uk
surface:
	Dr. Martin C. Atkins
	Dept. of Computer Science
	University of York
	Heslington
	York YO1 5DD
	ENGLAND