Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752984Ab1BFPlP (ORCPT ); Sun, 6 Feb 2011 10:41:15 -0500 Received: from mail-wy0-f174.google.com ([74.125.82.174]:54001 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752761Ab1BFPlN (ORCPT ); Sun, 6 Feb 2011 10:41:13 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:mime-version:content-type :content-disposition:user-agent; b=t6W4vkCCFRt9I6fTIRw4s343Tnw9DGUv4fOr385iLMZKGCn1gI5FXN11+iIWHLnM/O L5ndq+eMmRYEWpdmb8Y8n3ADUz4rNUqSNbUEL1vpu3pA6dWDYjIL9Zr3DMOs6+zIwVWN oQMhT2eG/hZ5WTKm5f/tas+hGWxpPVjkjL0kU= Date: Sun, 6 Feb 2011 17:41:08 +0200 From: "Ahmed S. Darwish" To: Randy Dunlap , Vivek Goyal , Haren Myneni Cc: Eric Biederman , kexec@lists.infradead.org, LKML , linux-doc@vger.kernel.org Subject: [PATCH -next] Documentation: Improve crashkernel= description Message-ID: <20110206154108.GA16542@laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1435 Lines: 39 (Also applicable over 2.6.38-rc3) Had to explore two C code files to make sense of the 'crashkernel=' kernel parameter values. Improve the situation. Signed-off-by: Ahmed S. Darwish --- diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 89835a4..8f26b42 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -545,9 +545,12 @@ and is between 256 and 4096 characters. It is defined in the file Format: ,,,[,] - crashkernel=nn[KMG]@ss[KMG] - [KNL] Reserve a chunk of physical memory to - hold a kernel to switch to with kexec on panic. + crashkernel=size[KMG][@offset[KMG]] + [KNL] Using kexec, Linux can switch to a 'crash kernel' + upon panic. This parameter reserves the physical + memory region [offset, offset + size] for that kernel + image. If the '@offset' part was ignored, Linux finds + a suitable crash image start address automatically. crashkernel=range1:size1[,range2:size2,...][@offset] [KNL] Same as above, but depends on the memory regards, -- Darwish http://darwish.07.googlepages.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/