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ramoops: use DT reserved-memory bindings

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Instead of a ramoops-specific node, use a child node of /reserved-memory.
This requires that of_platform_device_create() be explicitly called
for the node, though, since "/reserved-memory" does not have its own
"compatible" property.

Suggested-by: Rob Herring <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Acked-by: Rob Herring <[email protected]>
This commit is contained in:
Kees Cook 2016-07-29 18:11:32 -07:00
commit 529182e204
4 changed files with 56 additions and 33 deletions
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38
Documentation/ramoops.txt
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@ -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>