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From: Hari Bathini <hbathini@linux.ibm.com>
To: linuxppc-dev <linuxppc-dev@ozlabs.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.ibm.com>,
	Mahesh J Salgaonkar <mahesh@linux.ibm.com>,
	Vasant Hegde <hegdevasant@linux.ibm.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Stewart Smith <stewart@linux.ibm.com>,
	Daniel Axtens <dja@axtens.net>
Subject: [PATCH v2 11/16] powerpc/fadump: update documentation about CONFIG_PRESERVE_FA_DUMP
Date: Tue, 16 Apr 2019 16:05:35 +0530	[thread overview]
Message-ID: <155541093380.812.9686397018079546939.stgit@hbathini.in.ibm.com> (raw)
In-Reply-To: <155541065470.812.7120798773144842076.stgit@hbathini.in.ibm.com>

Kernel config option CONFIG_PRESERVE_FA_DUMP is introduced to ensure
crash data, from previously crash'ed kernel, is preserved. Update
documentation with this details.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
 Documentation/powerpc/firmware-assisted-dump.txt |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/powerpc/firmware-assisted-dump.txt b/Documentation/powerpc/firmware-assisted-dump.txt
index 844a229..fa35593 100644
--- a/Documentation/powerpc/firmware-assisted-dump.txt
+++ b/Documentation/powerpc/firmware-assisted-dump.txt
@@ -98,6 +98,15 @@ firmware versions on PSeries (PowerVM) platform and Power9
 and above systems with recent firmware versions on PowerNV
 (OPAL) platform.
 
+On OPAL based machines, system first boots into an intermittent
+kernel (referred to as petitboot kernel) before booting into the
+capture kernel. This kernel would have minimal kernel and/or
+userspace support to process crash data. Such kernel needs to
+preserve previously crash'ed kernel's memory for the subsequent
+capture kernel boot to process this crash data. Kernel config
+option CONFIG_PRESERVE_FA_DUMP has to be enabled on such kernel
+to ensure that crash data is preserved to process later.
+
 Implementation details:
 ----------------------
 


  parent reply	other threads:[~2019-04-16 10:53 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-16 10:32 [PATCH v2 00/16] Add FADump support on PowerNV platform Hari Bathini
2019-04-16 10:33 ` [PATCH v2 01/16] powerpc/fadump: move internal fadump code to a new file Hari Bathini
2019-04-16 10:33 ` [PATCH v2 02/16] powerpc/fadump: Improve fadump documentation Hari Bathini
2019-04-16 10:33 ` [PATCH v2 03/16] pseries/fadump: move out platform specific support from generic code Hari Bathini
2019-04-16 10:33 ` [PATCH v2 04/16] powerpc/fadump: use FADump instead of fadump for how it is pronounced Hari Bathini
2019-04-16 10:34 ` [PATCH v2 05/16] powerpc/fadump: enable fadump support on OPAL based POWER platform Hari Bathini
2019-04-16 10:34 ` [PATCH v2 06/16] powerpc/fadump: Update documentation about OPAL platform support Hari Bathini
2019-04-16 10:34 ` [PATCH v2 07/16] powerpc/fadump: consider reserved ranges while reserving memory Hari Bathini
2019-04-16 10:34 ` [PATCH v2 08/16] powerpc/fadump: consider reserved ranges while releasing memory Hari Bathini
2019-04-16 10:35 ` [PATCH v2 09/16] powernv/fadump: process architected register state data provided by firmware Hari Bathini
2019-05-07 14:13   ` Mahesh J Salgaonkar
2019-05-07 16:00     ` Segher Boessenkool
2019-05-09  4:42       ` Hari Bathini
2019-04-16 10:35 ` [PATCH v2 10/16] powernv/fadump: add support to preserve crash data on FADUMP disabled kernel Hari Bathini
2019-04-16 10:35 ` Hari Bathini [this message]
2019-04-16 10:35 ` [PATCH v2 12/16] powerpc/powernv: export /proc/opalcore for analysing opal crashes Hari Bathini
2019-05-08  0:25   ` Nicholas Piggin
2019-05-09  4:46     ` Hari Bathini
2019-04-16 10:35 ` [PATCH v2 13/16] powernv/fadump: Skip processing /proc/vmcore when only OPAL core exists Hari Bathini
2019-04-16 10:36 ` [PATCH v2 14/16] powernv/opalcore: provide an option to invalidate /proc/opalcore file Hari Bathini
2019-04-16 10:36 ` [PATCH v2 15/16] powernv/fadump: consider f/w load area Hari Bathini
2019-05-07 17:13   ` Mahesh J Salgaonkar
2019-05-09  4:50     ` Hari Bathini
2019-04-16 10:36 ` [PATCH v2 16/16] powernv/fadump: update documentation about option to release opalcore Hari Bathini

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