[9230] in linux-scsi channel archive
Re: example of scatter gather
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Thu Jul 20 18:02:21 2000
Date: Thu, 20 Jul 2000 23:41:14 +0200
From: Kurt Garloff <garloff@suse.de>
To: Linux SCSI list <linux-scsi@vger.rutgers.edu>
Message-ID: <20000720234114.L1834@garloff.etpnet.phys.tue.nl>
Mail-Followup-To: Kurt Garloff <garloff@suse.de>,
Linux SCSI list <linux-scsi@vger.rutgers.edu>
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In-Reply-To: <Pine.BSF.4.05.10007191342530.5316-100000@semuta.feral.com>; from mjacob@feral.com on Wed, Jul 19, 2000 at 01:43:02PM -0700
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On Wed, Jul 19, 2000 at 01:43:02PM -0700, Matthew Jacob wrote:
> > what's the best driver to look for examples for scsi drivers who do sca=
tter
> > gather without hardware support ?
> define 'hardware support'
For me the question looks rather clear:
If you have a script processor to handle SG segments or a fixed list that
you can submit to your chip on your HA, than you have HW support.=20
If you need to get an IRQ after each segment (which was transfered by ISA or
PCI DMA) and tell the SCSI controller where to put the next segment, than
you don't have HW support.=20
Now for the more diffcult question on what driver sources to look: I'd start
with aha152x.
Regards,
--=20
Kurt Garloff <garloff@suse.de> Eindhoven, NL
GPG key: See mail header, key servers Linux kernel development
SuSE GmbH, Nuernberg, FRG SCSI, Security
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