projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 35da6094 GH |
1 | Ramoops oops/panic logger |
| 2 | ========================= | |
| 3 | ||
| 4 | ramoops provides persistent RAM storage for oops and panics, so they can be | |
| 5 | recovered after a reboot. It is a backend to pstore, so this node is named | |
| 6 | "ramoops" after the backend, rather than "pstore" which is the subsystem. | |
| 7 | ||
| 8 | Parts of this storage may be set aside for other persistent log buffers, such | |
| 9 | as kernel log messages, or for optional ECC error-correction data. The total | |
| 10 | size of these optional buffers must fit in the reserved region. | |
| 11 | ||
| 12 | Any remaining space will be used for a circular buffer of oops and panic | |
| 13 | records. These records have a configurable size, with a size of 0 indicating | |
| 14 | that they should be disabled. | |
| 15 | ||
| 16 | At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size" | |
| 17 | must be set non-zero, but are otherwise optional as listed below. | |
| 18 | ||
| 19 | ||
| 20 | Required properties: | |
| 21 | ||
| 22 | - compatible: must be "ramoops" | |
| 23 | ||
| 24 | - memory-region: phandle to a region of memory that is preserved between | |
| 25 | reboots | |
| 26 | ||
| 27 | ||
| 28 | Optional properties: | |
| 29 | ||
| 30 | - ecc-size: enables ECC support and specifies ECC buffer size in bytes | |
| 31 | (defaults to 0: no ECC) | |
| 32 | ||
| 33 | - record-size: maximum size in bytes of each dump done on oops/panic | |
| 34 | (defaults to 0: disabled) | |
| 35 | ||
| 36 | - console-size: size in bytes of log buffer reserved for kernel messages | |
| 37 | (defaults to 0: disabled) | |
| 38 | ||
| 39 | - ftrace-size: size in bytes of log buffer reserved for function tracing and | |
| 40 | profiling (defaults to 0: disabled) | |
| 41 | ||
| 42 | - pmsg-size: size in bytes of log buffer reserved for userspace messages | |
| 43 | (defaults to 0: disabled) | |
| 44 | ||
| 45 | - unbuffered: if present, use unbuffered mappings to map the reserved region | |
| 46 | (defaults to buffered mappings) | |
| 47 | ||
| 48 | - no-dump-oops: if present, only dump panics (defaults to panics and oops) |