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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