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Diffstat (limited to 'Documentation/ramoops.txt')
| -rw-r--r-- | Documentation/ramoops.txt | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/Documentation/ramoops.txt b/Documentation/ramoops.txt index 9264bcab4099..26b9f31cf65a 100644 --- a/Documentation/ramoops.txt +++ b/Documentation/ramoops.txt @@ -45,18 +45,34 @@ corrupt, but usually it is restorable. 2. Setting the parameters -Setting the ramoops parameters can be done in 3 different manners: - 1. Use the module parameters (which have the names of the variables described - as before). - For quick debugging, you can also reserve parts of memory during boot - and then use the reserved memory for ramoops. For example, assuming a machine - with > 128 MB of memory, the following kernel command line will tell the - kernel to use only the first 128 MB of memory, and place ECC-protected ramoops - region at 128 MB boundary: +Setting the ramoops parameters can be done in several different manners: + + A. Use the module parameters (which have the names of the variables described + as before). For quick debugging, you can also reserve parts of memory during + boot and then use the reserved memory for ramoops. For example, assuming a + machine with > 128 MB of memory, the following kernel command line will tell + the kernel to use only the first 128 MB of memory, and place ECC-protected + ramoops region at 128 MB boundary: "mem=128M ramoops.mem_address=0x8000000 ramoops.ecc=1" - 2. Use Device Tree bindings, as described in - Documentation/device-tree/bindings/misc/ramoops.txt. - 3. Use a platform device and set the platform data. The parameters can then + + B. Use Device Tree bindings, as described in + Documentation/device-tree/bindings/reserved-memory/ramoops.txt. + For example: + + reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + + ramoops@8f000000 { + compatible = "ramoops"; + reg = <0 0x8f000000 0 0x100000>; + record-size = <0x4000>; + console-size = <0x4000>; + }; + }; + + C. 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/pstore_ram.h> |