Date: Wed, 1 Jan 1997 03:50:03 -0800 (PST) From: Helbig@MX.BA-Stuttgart.De To: freebsd-bugs Subject: Re: kern/2305: system hangs with second Ide controller Message-ID: <199701011150.DAA24787@freefall.freebsd.org>
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The following reply was made to PR kern/2305; it has been noted by GNATS. From: Helbig@MX.BA-Stuttgart.De To: freebsd-gnats-submit@freebsd.org, wh@helbig.informatik.ba-stuttgart.de Cc: Subject: Re: kern/2305: system hangs with second Ide controller Date: Wed, 1 Jan 1997 12:48:11 +0100 (MET) In the meantime I have been pointed to some URL's (thanks to everyone !) from which I learned that I have a "well known problem", the IDE-Controller CMD 640B, which just doesn't support concurrently use of both channels. Seems that other operating systems either don't use primary and secondary IDE port simultaneously (like DOS ...) or have an option to prevent this (like Linux). I wonder why it's worthwhile to implement a workaround for this hardware flaw in the FreeBSD-Kernel. The URLS are: http://thef-nym.sci.kun.nl/cgi-pieterh/atazip/atafq-3.html#ss3.2 http://www.phyttp://www.physics.ohio-state.edu/~jrdemers/ibm/eide.txt Of the three 640B-flaws mentioned in the second URL only the third seems to apply to my configuration. (lucky me!): Does not support simultaneous I/O on primary and secondary EIDE ports. If someone patched the wd-controller to avoid simultaneous I/O please let me know! Happy New Year, Wolfgang Helbig
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