[PATCH v4 RFT 2/2] powerpc/fadump: update documentation about 'fadump_append=' parameter

From: Michal Suchanek
Date: Tue May 02 2017 - 11:57:25 EST

With the introduction of 'fadump_append=' parameter to pass additional
parameters to fadump (capture) kernel, update documentation about it.

Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
Documentation/powerpc/firmware-assisted-dump.txt | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/powerpc/firmware-assisted-dump.txt b/Documentation/powerpc/firmware-assisted-dump.txt
index 9cabaf8..99ab8f4 100644
--- a/Documentation/powerpc/firmware-assisted-dump.txt
+++ b/Documentation/powerpc/firmware-assisted-dump.txt
@@ -162,7 +162,11 @@ How to enable firmware-assisted dump (fadump):

1. Set config option CONFIG_FA_DUMP=y and build kernel.
2. Boot into linux kernel with 'fadump=on' kernel cmdline option.
-3. Optionally, user can also set 'crashkernel=' kernel cmdline
+3. A user can pass additional kernel parameters as a comma separated list
+ through 'fadump_append=' parameter, to be be appended when fadump is active.
+ This can be used to pass parameters like nr_cpus=1, numa=off to reduce
+ memory consumption during dump capture.
+4. Optionally, user can also set 'fadump_reserve_mem=' kernel cmdline
to specify size of the memory to reserve for boot memory dump

@@ -172,6 +176,8 @@ NOTE: 1. 'fadump_reserve_mem=' parameter has been deprecated. Instead
2. If firmware-assisted dump fails to reserve memory then it
will fallback to existing kdump mechanism if 'crashkernel='
option is set at kernel cmdline.
+ 3. 'fadump_append=' parameter con be quoted to append multiple arguments
+ as in 'fadump_append="nr_cpus=8 numa=off"'

Sysfs/debugfs files: