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| author | Hari Bathini <hbathini@linux.ibm.com> | 2019-09-11 20:26:16 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-09-14 00:04:45 +1000 |
| commit | 58cf055df47bb115e7c1533eec2a8f66639b80e3 (patch) | |
| tree | 8494849b22e8613fb47a3bbe8ad4c2d7387c3915 /Documentation/powerpc | |
| parent | bec53196adf4791d466adf0e339b61186c7b5283 (diff) | |
| download | lwn-58cf055df47bb115e7c1533eec2a8f66639b80e3.tar.gz lwn-58cf055df47bb115e7c1533eec2a8f66639b80e3.zip | |
powerpc/fadump: update documentation about CONFIG_PRESERVE_FA_DUMP
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
Diffstat (limited to 'Documentation/powerpc')
| -rw-r--r-- | Documentation/powerpc/firmware-assisted-dump.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/powerpc/firmware-assisted-dump.rst b/Documentation/powerpc/firmware-assisted-dump.rst index ab578ac64c09..08a9b5efcdc8 100644 --- a/Documentation/powerpc/firmware-assisted-dump.rst +++ b/Documentation/powerpc/firmware-assisted-dump.rst @@ -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: ----------------------- |