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From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Nigel Cunningham <ncunningham@linuxmail.org>
Cc: Paul Mackerras <paulus@samba.org>,
	Alon Bar-Lev <alon.barlev@gmail.com>, Andi Kleen <ak@suse.de>,
	Matt Domsch <Matt_Domsch@dell.com>, Andrew Morton <akpm@osdl.org>,
	linux-kernel@vger.kernel.org, johninsd@san.rr.com,
	davej@codemonkey.org.uk, Riley@williams.name,
	trini@kernel.crashing.org, davem@davemloft.net, ecd@brainaid.de,
	jj@sunsite.ms.mff.cuni.cz, anton@samba.org, wli@holomorphy.com,
	lethal@linux-sh.org, rc@rc0.org.uk, spyro@f2s.com,
	rth@twiddle.net, avr32@atmel.com, hskinnemoen@atmel.com,
	starvik@axis.com, ralf@linux-mips.org, matthew@wil.cx,
	grundler@parisc-linux.org, geert@linux-m68k.org,
	zippel@linux-m68k.org, heiko.carstens@de.ibm.com,
	uclinux-v850@lsi.nec.co.jp, chris@zankel.net
Subject: Re: [PATCH 00/26] Dynamic kernel command-line
Date: Mon, 04 Sep 2006 10:32:07 +0200	[thread overview]
Message-ID: <1157358727.5078.11.camel@localhost> (raw)
In-Reply-To: <1157338220.10336.147.camel@nigel.suspend2.net>

On Mon, 2006-09-04 at 12:50 +1000, Nigel Cunningham wrote:
> I agree. The current limit varies widely, most often being 256 or 512,
> but sometimes also 896 (s390!) or 1024 (arm, arm26, parisc) or 4096
> (uml). Would users and developers of those arches care to enlighten? Why
> 896?

Simple. Between 0x10480 and 0x10800 there are 0x380 bytes available.
That makes 895 characters for the commandline. Completly obvious, how
could you miss it ? ;-)
The reason is our initial address space layout for the very first kernel
images. Now it is hard to changed because the different ipl tools rely
on the layout. We choose to add a few more bytes than 256 because on
s390 we potentially have many devices. The dasd= parameter can really be
big.

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.



-- 
VGER BF report: H 0

  reply	other threads:[~2006-09-04  8:32 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-09-03 21:50 [PATCH 00/26] Dynamic kernel command-line Alon Bar-Lev
2006-09-03 21:52 ` [PATCH 01/26] Dynamic kernel command-line - common Alon Bar-Lev
2006-09-03 22:10   ` Matthew Wilcox
2006-09-03 22:12     ` Alon Bar-Lev
2006-09-05 23:52     ` Bill Davidsen
2006-09-03 21:52 ` [PATCH 02/26] Dynamic kernel command-line - alpha Alon Bar-Lev
2006-09-03 21:53 ` [PATCH 03/26] Dynamic kernel command-line - arm Alon Bar-Lev
2006-09-03 21:54 ` [PATCH 04/26] Dynamic kernel command-line - arm26 Alon Bar-Lev
2006-09-03 21:54 ` [PATCH 05/26] Dynamic kernel command-line - avr32 Alon Bar-Lev
2006-09-03 21:55 ` [PATCH 06/26] Dynamic kernel command-line - cris Alon Bar-Lev
2006-09-03 21:55 ` [PATCH 07/26] Dynamic kernel command-line - frv Alon Bar-Lev
2006-09-03 21:56 ` [PATCH 08/26] Dynamic kernel command-line - h8300 Alon Bar-Lev
2006-09-03 21:56 ` [PATCH 09/26] Dynamic kernel command-line - i386 Alon Bar-Lev
2006-09-03 21:56 ` [PATCH 10/26] Dynamic kernel command-line - ia64 Alon Bar-Lev
2006-09-03 21:57 ` [PATCH 11/26] Dynamic kernel command-line - m32r Alon Bar-Lev
2006-09-03 21:57 ` [PATCH 12/26] Dynamic kernel command-line - m68k Alon Bar-Lev
2006-09-03 21:58 ` [PATCH 13/26] Dynamic kernel command-line - m68knommu Alon Bar-Lev
2006-09-03 21:58 ` [PATCH 14/26] Dynamic kernel command-line - mips Alon Bar-Lev
2006-09-03 21:59 ` [PATCH 15/26] Dynamic kernel command-line - parisc Alon Bar-Lev
2006-09-03 21:59 ` [PATCH 16/26] Dynamic kernel command-line - powerpc Alon Bar-Lev
2006-09-03 22:00 ` [PATCH 17/26] Dynamic kernel command-line - ppc Alon Bar-Lev
2006-09-03 22:00 ` [PATCH 18/26] Dynamic kernel command-line - s390 Alon Bar-Lev
2006-09-03 22:01 ` [PATCH 19/26] Dynamic kernel command-line - sh Alon Bar-Lev
2006-09-03 22:01 ` [PATCH 20/26] Dynamic kernel command-line - sh64 Alon Bar-Lev
2006-09-03 22:01 ` [PATCH 21/26] Dynamic kernel command-line - sparc Alon Bar-Lev
2006-09-03 22:02 ` [PATCH 22/26] Dynamic kernel command-line - sparc64 Alon Bar-Lev
2006-09-03 22:02 ` [PATCH 23/26] Dynamic kernel command-line - um Alon Bar-Lev
2006-09-03 22:03 ` [PATCH 24/26] Dynamic kernel command-line - v850 Alon Bar-Lev
2006-09-03 22:03 ` [PATCH 25/26] Dynamic kernel command-line - x86_64 Alon Bar-Lev
2006-09-03 22:03 ` [PATCH 26/26] Dynamic kernel command-line - xtensa Alon Bar-Lev
2006-09-03 23:33 ` [PATCH 00/26] Dynamic kernel command-line Paul Mackerras
2006-09-04  2:50   ` Nigel Cunningham
2006-09-04  8:32     ` Martin Schwidefsky [this message]
2006-09-04  8:42       ` Alon Bar-Lev
2006-09-04  5:05   ` Alon Bar-Lev
2006-09-04  6:12   ` Andi Kleen
2006-09-04 17:09   ` Luca
2006-09-04  1:01 ` Josh Boyer
2006-09-04  5:07   ` Alon Bar-Lev
2006-09-04 19:59     ` Josh Boyer
2006-12-02 10:47 Alon Bar-Lev
2007-01-18 12:58 [patch " Bernhard Walle

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