Date: Wed, 23 Dec 1998 00:00:50 +0100 From: J Wunsch <j@uriah.heep.sax.de> To: scsi@FreeBSD.ORG Subject: Re: 3.0R && AHA1540A == no go Message-ID: <19981223000050.28179@uriah.heep.sax.de> In-Reply-To: <199812222134.OAA14499@narnia.plutotech.com>; from Justin T. Gibbs on Tue, Dec 22, 1998 at 02:34:44PM -0700 References: <19981222173104.28962@uriah.heep.sax.de> <199812222134.OAA14499@narnia.plutotech.com>
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As Justin T. Gibbs wrote: > I believe that the 1540A does not support residual calculating > CCB opcodes. I'm almost sure it doesn't. > So, you'd have to modify the driver to use these > opcodes on pre-historic devices. `these'? (Sorry, which ones?) > Unfortunately it is impossible > to get correct underrun information without these opcodes, so you'll > have to get creative in this case and you may expose portions of > the CAM code that become confused if the residual reported is incorrect. Hmm, what does that mean ``for the average user''? IOW: under normal circumstances, is it likely that residuals are reported at all? Or in case an adapter doesn't support them, can we just assume there's no residual (without big harm)? I have no good clues about what a residual actual means other than `something was left over from an old request' or something like that... It would be too bad if i had to throw away an otherwise working controller that does its job well (well enough for the environment it's running in, remember it's a scratch machine). I probably would stick with 2.2.x then, but that's a less optimal solution. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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