[1642] in linux-announce channel archive
Driver for IBM Microchannel SCSI Subsystem
daemon@ATHENA.MIT.EDU (Lars Wirzenius)
Mon Jan 29 16:37:26 1996
Date: Wed, 17 Jan 1996 01:11:33 +0200
From: Lars Wirzenius <wirzeniu@cc.helsinki.fi>
To: linux-announce@vger.rutgers.edu
From: Martin Kolinek <kol@kol.seanet.com>
Subject: Driver for IBM Microchannel SCSI Subsystem
Approved: linux-announce@news.ornl.gov (Lars Wirzenius)
Newsgroups: comp.os.linux.announce
Followup-to: comp.os.linux.development.system
Organization: ?
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During December, I developed a driver for IBM SCSI Microchannel adapter (or
subsystem as IBM calls it), and for the last few weeks it has been running
flawlessly (except one minor problem, see bellow) on my PS/2 machine. The
X11 XF86-AGX server (version 3.1.2)
also works without any problem with XGA-2 adapter (once the right addresses
are in the XF86Config file), and Slackware installs
right from SCSI CD (one just needs boot disk with the driver).
So I think that high end PS/2's (with SCSI and XGA or XGA-2)
should now be able to run Linux. This SCSI driver is simpler than
the older ESDI drivers, since the subsystem has an embedded microprocessor
which hides the complexities of SCSI bus and DMA.
I have the driver in Linux 1.2.8, and also 1.3.15, compiled
by gcc 2.6.3. As these are somewhat obsolete, I going to buy a new
set of Linux CD's, and to move versions 1.2.13 and 1.3.20.
That may take 2-3 days, and then I put the driver out for other people to
try it (I am not sure where to put it for others to download).
The only problem I observed is when reading a CD damaged by
scratches or with fingerprints. The resulting errors are now always
handled well. Since this may be caused by the upper layer of Linux SCSI
driver rather than my code, I want to wait with debugging
until I move to the 1.3.20 or higher kernel.
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