--- zzzz-none-000/linux-4.4.271/Documentation/ramoops.txt 2021-06-03 06:22:09.000000000 +0000 +++ dakota-7530ac-750/linux-4.4.271/Documentation/ramoops.txt 2023-01-11 09:25:41.000000000 +0000 @@ -45,16 +45,34 @@ 2. Setting the parameters -Setting the ramoops parameters can be done in 2 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 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