Date: Mon, 30 Jan 2006 17:38:21 +0100 From: Matthias Andree <matthias.andree@gmx.de> To: Stefan Esser <se@FreeBSD.org> Cc: freebsd-scsi@FreeBSD.ORG, matthias.andree@gmx.de, olli@lurza.secnetix.de Subject: Re: SCSI scanner, sym/ncr driver, pt(4) Message-ID: <20060130163821.GC19173@merlin.emma.line.org> In-Reply-To: <43DE3E38.2080902@FreeBSD.org> References: <200601251000.k0PA02CY070581@lurza.secnetix.de> <43DE3E38.2080902@FreeBSD.org>
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On Mon, 30 Jan 2006, Stefan Esser wrote:
> > > > But I wonder if the ncr(4) driver offered any advantages.
> > >
> > > It doesn't. There used to be a time when it worked with the old 810 and
> > > sym(4) didn't, but this no longer holds.
>
> Hmmm, this is news to me. That would require the sym driver to contain
> both sets of SCRIPTS code, the one from the NCR driver and the one from
> the sym driver.
The man page sym(4) reads (as of 6-STABLE):
"sym also uses LOAD/STORE SCRIPTS instructions for chips that
support it. Only the early 810, 815 and 825 NCR chips do not
support LOAD/STORE. Use of LOAD/STORE instead of MEMORY MOVE
allows SCRIPTS to access IO registers internal to the chip (no
external PCI cycles). As a result, the driver guarantees that no
PCI self-mastering will occur for chips that support LOAD/STORE."
--
Matthias Andree
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