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-rw-r--r--Documentation/ramoops.txt16
1 files changed, 11 insertions, 5 deletions
diff --git a/Documentation/ramoops.txt b/Documentation/ramoops.txt
index 8fb1ba7..4ba7db2 100644
--- a/Documentation/ramoops.txt
+++ b/Documentation/ramoops.txt
@@ -3,7 +3,7 @@ Ramoops oops/panic logger
Sergiu Iordache <sergiu@chromium.org>
-Updated: 8 August 2011
+Updated: 17 November 2011
0. Introduction
@@ -30,6 +30,11 @@ variable while setting 0 in that variable dumps only the panics.
The module uses a counter to record multiple dumps but the counter gets reset
on restart (i.e. new dumps after the restart will overwrite old ones).
+Ramoops also supports software ECC protection of persistent memory regions.
+This might be useful when a hardware reset was used to bring the machine back
+to life (i.e. a watchdog triggered). In such cases, RAM may be somewhat
+corrupt, but usually it is restorable.
+
2. Setting the parameters
Setting the ramoops parameters can be done in 2 different manners:
@@ -38,7 +43,7 @@ Setting the ramoops parameters can be done in 2 different manners:
2. Use a platform device and set the platform data. The parameters can then
be set through that platform data. An example of doing that is:
-#include <linux/ramoops.h>
+#include <linux/pstore_ram.h>
[...]
static struct ramoops_platform_data ramoops_data = {
@@ -46,6 +51,7 @@ static struct ramoops_platform_data ramoops_data = {
.mem_address = <...>,
.record_size = <...>,
.dump_oops = <...>,
+ .ecc = <...>,
};
static struct platform_device ramoops_dev = {
@@ -71,6 +77,6 @@ timestamp and a new line. The dump then continues with the actual data.
4. Reading the data
-The dump data can be read from memory (through /dev/mem or other means).
-Getting the module parameters, which are needed in order to parse the data, can
-be done through /sys/module/ramoops/parameters/* .
+The dump data can be read from the pstore filesystem. The format for these
+files is "dmesg-ramoops-N", where N is the record number in memory. To delete
+a stored record from RAM, simply unlink the respective pstore file.