52 lines
1.8 KiB
Plaintext
52 lines
1.8 KiB
Plaintext
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Ramoops oops/panic logger
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=========================
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ramoops provides persistent RAM storage for oops and panics, so they can be
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recovered after a reboot. This is a child-node of "/reserved-memory", and
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is named "ramoops" after the backend, rather than "pstore" which is the
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subsystem.
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Parts of this storage may be set aside for other persistent log buffers, such
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as kernel log messages, or for optional ECC error-correction data. The total
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size of these optional buffers must fit in the reserved region.
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Any remaining space will be used for a circular buffer of oops and panic
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records. These records have a configurable size, with a size of 0 indicating
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that they should be disabled.
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At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size"
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must be set non-zero, but are otherwise optional as listed below.
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Required properties:
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- compatible: must be "ramoops"
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- reg: region of memory that is preserved between reboots
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Optional properties:
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- ecc-size: enables ECC support and specifies ECC buffer size in bytes
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(defaults to 0: no ECC)
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- record-size: maximum size in bytes of each dump done on oops/panic
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(defaults to 0: disabled)
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- console-size: size in bytes of log buffer reserved for kernel messages
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(defaults to 0: disabled)
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- ftrace-size: size in bytes of log buffer reserved for function tracing and
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profiling (defaults to 0: disabled)
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- pmsg-size: size in bytes of log buffer reserved for userspace messages
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(defaults to 0: disabled)
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- unbuffered: if present, use unbuffered mappings to map the reserved region
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(defaults to buffered mappings)
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- no-dump-oops: if present, only dump panics (defaults to panics and oops)
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- flags: if present, pass ramoops behavioral flags (defaults to 0,
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see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values).
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