Bug#325904: marked as done (incorrect mac68k SCSI boot parameter)
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and subject line Bug#325904: incorrect mac68k SCSI boot parameter
has caused the attached Bug report to be marked as done.
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From: Wouter Verhelst <wouter@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: incorrect mac68k SCSI boot parameter
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Date: Wed, 31 Aug 2005 19:53:34 +0200
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Package: debian-installer-manual
Version: 20050317
Severity: minor
Hi,
The Debian install manual for m68k says the following in section
5.1.1.4:
If your hardware uses a 53c9x-based scsi bus, then you may need
to include the kernel parameter mac53c9x=1. Hardware with two
such scsi buses, such as the Quadra 950, will need mac53c9x=2
instead.
This information is not fully accurate.
The mac53c9x parameter allows one to configure some aspects of this
driver.
The first is to disable bus autodetection and manually specify
the number of buses.
The second is to disable SCSI disconnects. As the peculiarities of the
mac hardware have had to be reverse engineered, some bugs remain in the
driver, and one of those bugs is that the system can experience complete
lockups if SCSI disconnects are allowed. To remedy this, this second
parameter was implemented; when at "1" (which is the default)
disconnects are allowed, but when at "0", disconnects are disabled
(which is safer but also slower).
The above instructions do disable bus autodetection, but do not disable
SCSI disconnects -- which was the whole point of including it!
To remedy, the paremeters should read "mac53c9x=1,0" or "mac53c9x=2,0",
respectively. Alternatively, the parameter can be specified as
"mac53c9x=-1,0" which will leave autodetection on, but which will
disable SCSI disconnects.
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: powerpc (ppc)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.13
Locale: LANG=nl_BE.UTF-8@euro, LC_CTYPE=nl_BE.UTF-8@euro (charmap=UTF-8)
-- no debconf information
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From: Frans Pop <aragorn@tiscali.nl>
To: 325904-done@bugs.debian.org
Subject: Re: Bug#325904: incorrect mac68k SCSI boot parameter
Date: Wed, 31 Aug 2005 21:35:36 +0200
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On Wednesday 31 August 2005 21:06, Wouter Verhelst wrote:
> > If your hardware uses a 53c9x-based scsi bus, then you may need
> > to include the kernel parameter mac53c9x=1,0. Hardware with two
> > such scsi buses, such as the Quadra 950, will need mac53c9x=2,0
> > instead. Alternatively, the parameter can be specified as
> > mac53c9x=-1,0 which will leave autodetection on, but which will
> > disable SCSI disconnects.
Changed.
> Perhaps it might be interesting to add a little bit of explanation,
> though:
> Specifying this parameter is only necessary if you have more
> than one hard disk; otherwise, the system will run faster if
> you do not specify it.
Added as well.
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