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