[PATCH v2 16/16] powernv/fadump: update documentation about option to release opalcore

@@ -107,6 +107,16 @@ capture kernel boot to process this crash data. Kernel config
 option CONFIG_PRESERVE_FA_DUMP has to be enabled on such kernel
 to ensure that crash data is preserved to process later.
 
+-- On OPAL based machines (PowerNV), if the kernel is build with
+   CONFIG_OPAL_CORE=y, OPAL memory at the time of crash is also
+   exported as /proc/opalcore file. This procfs file is helpful
+   in debugging OPAL crashes with GDB. The kernel memory used
+   for exporting this procfs file can be released by echo'ing
+   '1' to /sys/kernel/fadump_release_opalcore node.
+
+   e.g.
+     # echo 1 > /sys/kernel/fadump_release_opalcore
+
 Implementation details:
 ----------------------
 

@@ -260,6 +270,15 @@ Here is the list of files under kernel sysfs:
     enhanced to use this interface to release the memory reserved for
     dump and continue without 2nd reboot.
 
+ /sys/kernel/fadump_release_opalcore
+
+    This file is available only on OPAL based machines when FADump is
+    active during capture kernel. This is used to release the memory
+    used by the kernel to export /proc/opalcore file. To release this
+    memory, echo '1' to it:
+
+    echo 1  > /sys/kernel/fadump_release_opalcore
+
 Here is the list of files under powerpc debugfs:
 (Assuming debugfs is mounted on /sys/kernel/debug directory.)