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Workaround for Multiple Disk Problem

To: Linux/MIPS list <>
Subject: Workaround for Multiple Disk Problem
From: Klaus Naumann <>
Date: Mon, 23 Jul 2001 00:52:26 +0200 (CEST)
Hi all,

the attached patch is a _WORK-AROUND_ for the Multiple Disk Problem which
is one of the biggest show stoppers on Indy/Indigo2 systems.
It disables DMA transfers to the SCSI bus. I'm not sure if this
is much slower. Please consider this a work around for machines
which have small disks and need them all to make up a decent build
machine or so ...
The patch implements a new config option right below SGI WD33C93 SCSI
Support in the SCSI Devices Configuration. Activate it and recompile
your kernel (you may have to do make distclean to recompile).
The driver will display a warning at boot time that this kernel has
DMA disabled.
I also know that this C code is the kind of C code which is really bad.
It's somewhat like the stuff your mother has warned you before when
you were young ...
But well it's a hack so I don't care.

                Enjoy, Klaus

Full Name   : Klaus Naumann     | ( (Germany)
Nickname    : Spock             | Org.: Mad Guys Network
Phone / FAX : ++49/177/7862964  | E-Mail: (
PGP Key     :

Attachment: sgiwd93_nodma.patch
Description: Text document

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