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powerpc/fadump: update documentation about CONFIG_PRESERVE_FA_DUMP

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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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821377195.5656.15840065629705958324.stgit@hbathini.in.ibm.com
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Hari Bathini 2019-09-11 20:26:16 +05:30 committed by Michael Ellerman
parent bec53196ad
commit 58cf055df4
1 changed files with 9 additions and 0 deletions
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Documentation/powerpc/firmware-assisted-dump.rst
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@ -101,6 +101,15 @@ or later firmware versions on PowerNV (OPAL) platform.
Note that, OPAL firmware exports ibm,opal/dump node when
FADump is supported on PowerNV 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:
-----------------------