From patchwork Thu Apr 14 21:21:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geoff Levand X-Patchwork-Id: 65861 Delivered-To: patch@linaro.org Received: by 10.140.93.198 with SMTP id d64csp834915qge; Thu, 14 Apr 2016 14:33:11 -0700 (PDT) X-Received: by 10.98.70.67 with SMTP id t64mr24403190pfa.110.1460669591543; Thu, 14 Apr 2016 14:33:11 -0700 (PDT) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [198.137.202.9]) by mx.google.com with ESMTPS id in8si11528736pac.121.2016.04.14.14.33.11 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Apr 2016 14:33:11 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 198.137.202.9 as permitted sender) client-ip=198.137.202.9; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 198.137.202.9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aqorz-0001Ng-Uu; Thu, 14 Apr 2016 21:32:11 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aqohs-0006Z8-1Z; Thu, 14 Apr 2016 21:21:44 +0000 Received: from geoff by merlin.infradead.org with local (Exim 4.85_2 #1 (Red Hat Linux)) id 1aqohm-0003Wt-2y; Thu, 14 Apr 2016 21:21:38 +0000 Message-Id: In-Reply-To: References: From: Geoff Levand Patch-Date: Wed, 19 Aug 2015 11:50:20 +0900 Subject: [PATCH v16 20/20] arm64: kdump: update a kernel doc To: Catalin Marinas , Will Deacon Date: Thu, 14 Apr 2016 21:21:38 +0000 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , marc.zyngier@arm.com, kexec@lists.infradead.org, AKASHI Takahiro , James Morse , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org From: AKASHI Takahiro This patch adds arch specific descriptions about kdump usage on arm64 to kdump.txt. Signed-off-by: AKASHI Takahiro --- Documentation/kdump/kdump.txt | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) -- 2.5.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt index bc4bd5a..acc4d98 100644 --- a/Documentation/kdump/kdump.txt +++ b/Documentation/kdump/kdump.txt @@ -18,7 +18,7 @@ memory image to a dump file on the local disk, or across the network to a remote system. Kdump and kexec are currently supported on the x86, x86_64, ppc64, ia64, -s390x and arm architectures. +s390x, arm and arm64 architectures. When the system kernel boots, it reserves a small section of memory for the dump-capture kernel. This ensures that ongoing Direct Memory Access @@ -249,6 +249,12 @@ Dump-capture kernel config options (Arch Dependent, arm) AUTO_ZRELADDR=y +Dump-capture kernel config options (Arch Dependent, arm64) +---------------------------------------------------------- + +1) Currently, kvm will not be enabled on the dump-capture kernel even + if it is configured. + Extended crashkernel syntax =========================== @@ -312,6 +318,8 @@ Boot into System Kernel any space below the alignment point may be overwritten by the dump-capture kernel, which means it is possible that the vmcore is not that precise as expected. + On arm64, use "crashkernel=Y[@X]". Note that the start address of + the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000). Load the Dump-capture Kernel ============================ @@ -334,6 +342,8 @@ For s390x: - Use image or bzImage For arm: - Use zImage +For arm64: + - Use vmlinux or Image If you are using a uncompressed vmlinux image then use following command to load dump-capture kernel. @@ -377,6 +387,9 @@ For s390x: For arm: "1 maxcpus=1 reset_devices" +For arm64: + "1 maxcpus=1 reset_devices" + Notes on loading the dump-capture kernel: * By default, the ELF headers are stored in ELF64 format to support