Date: Wed, 20 Feb 2002 22:31:24 +0100 From: Joerg Wunsch <j@uriah.heep.sax.de> To: Kelly Yancey <kbyanc@posi.net> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: RBC support patch Message-ID: <20020220223124.A9579@uriah.heep.sax.de> In-Reply-To: <20020220123457.Y86103-100000@gateway.posi.net>; from kbyanc@posi.net on Wed, Feb 20, 2002 at 12:39:28PM -0800 References: <200202201936.g1KJaAO07448@uriah.heep.sax.de> <20020220123457.Y86103-100000@gateway.posi.net>
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As Kelly Yancey wrote: > > They are not broken. READ(6)/WRITE(6) are not mandatory for direct > > access devices by the standard, but READ(10)/WRITE(10) are. > Unfortunately, my copy of the SCSI-2 draft lists READ(10) and > WRITE(10) as optional for direct-access devices. Otherwise, this > would be an easy fix to a > long standing annoyance. :| Hmm, after reading the docs again, i have to correct myself: both are mandatory, either by my SCSI-2 copy as well as by the SCSI-3 drafts i've got. The latter contain a footnote explaining that the 6-byte commands have been kept as `mandatory' since some boot environments require it, while applications are requested to migrate to the 10-byte commands. So perhaps we should simply reverse the logic, use the 10-byte opcodes as default, and collect the list of (too old) devices that require the 6-byte CDBs. How does that sound? -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL 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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