Date: Wed, 25 Jan 2006 11:26:19 +0100 From: Matthias Andree <matthias.andree@gmx.de> To: freebsd-scsi@FreeBSD.ORG Subject: Re: SCSI scanner, sym/ncr driver, pt(4) Message-ID: <m3y814wqlw.fsf@merlin.emma.line.org> In-Reply-To: <200601251000.k0PA02CY070581@lurza.secnetix.de> (Oliver Fromme's message of "Wed, 25 Jan 2006 11:00:02 %2B0100 (CET)") References: <200601251000.k0PA02CY070581@lurza.secnetix.de>
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Oliver Fromme <olli@lurza.secnetix.de> writes: > Matthias Andree <matthias.andree@gmx.de> wrote: > > Oliver Fromme <olli@lurza.secnetix.de> writes: > > > First I noticed that the NCR810 host adapter seems to be > > > supported both by ncr(4) and sym(4). I was unable to find > > > any documentation about the advantages of each. > > > > Try reading the man pages carefully. > > > > The differences have melted down somewhat in the past. > > > > There was a time when sym(4) didn't support the more efficient > > LOAD/STORE uncapable 810, 815, 825 chips (the A variants, where they > > exist, support LOAD/STORE). sym(4) has learned to use MEMMOVE on these, > > however. > > > > ncr(4) has never used LOAD/STORE, and lacks support for the 897 chip and > > the 1010 family. > > I've read about that LOAD/STORE and MEMMOVE stuff in the > manpage, but I'm not a SCSI expert, so that's really only > gibberish to me, I'm afraid. The driver downloads a program to the SCSI chip that handles the protocol, and the commands that these programs ("SCRIPTS") can use depend on the chip. > Hell, I do not even know if my "810" card is an "early NCR 810" which > sym(4) keeps talking about. Why bother as long as it works :-) > If you're just a user, the manpages fail to tell whether > the sym(4) or ncr(4) driver is preferred for an 810 host > adapter. Personally, I'd prefer sym(4). > I certainly agree with that. But pt(4) is not a scanner > driver, but a generic SCSI processing target driver, right? Never used it or even looked at the docs. > However, gimp and the xscanimage plugin use the full SANE > scanner device string for identifying it and storing their > configuration. AFAIR you can use xscan as GIMP plugin, too. -- Matthias Andree
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