With the introduction of 'fadump_append=' parameter to pass additional parameters to fadump (capture) kernel, update documentation about it.
Signed-off-by: Hari Bathini <hbath...@linux.vnet.ibm.com> --- Changes from v4: * Based on top of patchset that includes https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=akpm&id=05f383cdfba8793240e73f9a9fbff4e25d66003f Documentation/powerpc/firmware-assisted-dump.txt | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/Documentation/powerpc/firmware-assisted-dump.txt b/Documentation/powerpc/firmware-assisted-dump.txt index 8394bc8..6327193 100644 --- a/Documentation/powerpc/firmware-assisted-dump.txt +++ b/Documentation/powerpc/firmware-assisted-dump.txt @@ -162,7 +162,15 @@ 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 command line parameters as a comma + separated list through 'fadump_append=' parameter, to be enforced + when fadump is active. For example, if parameters like nr_cpus=1, + numa=off & udev.children-max=2 are to be enforced when fadump is + active, 'fadump_append=nr_cpus=1,numa=off,udev.children-max=2' + can be passed in command line, which will be replaced with + "nr_cpus=1 numa=off udev.children-max=2" when fadump is active. + This helps in reducing memory consumption during dump capture. +4. Optionally, user can also set 'crashkernel=' kernel cmdline to specify size of the memory to reserve for boot memory dump preservation.
