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pstore/ram: Add some more documentation and examples 

Suggested-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Colin Cross <ccross@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov 2012-05-26 06:20:25 -07:00 committed by Greg Kroah-Hartman
parent 602b5be4f1
commit 958502d836
1 changed files with 14 additions and 0 deletions
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14
Documentation/ramoops.txt
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@ -40,6 +40,12 @@ corrupt, but usually it is restorable.
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:
"mem=128M ramoops.mem_address=0x8000000 ramoops.ecc=1"
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:
@ -70,6 +76,14 @@ if (ret) {
return ret;
}
You can specify either RAM memory or peripheral devices' memory. However, when
specifying RAM, be sure to reserve the memory by issuing memblock_reserve()
very early in the architecture code, e.g.:
#include <linux/memblock.h>
memblock_reserve(ramoops_data.mem_address, ramoops_data.mem_size);
3. Dump format
The data dump begins with a header, currently defined as "====" followed by a