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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: ----------------------- |