Update default.conf

Also mention that on POWER by default
no firmware files are included in the initrd.

usr/share/rear/conf/default.conf

@@ -1787,9 +1787,12 @@ LD_LIBRARY_PATH_FOR_BACKUP_TOOL=""
 MODULES=( 'all_modules' )
 #
 # Enforce to load these modules in the given order in the rescue/recovery system.
-# We also load modules listed in /etc/modules. The order is 1) /etc/modules and
-# 2) MODULES_LOAD and 3) modules loaded by udev or systemd. ReaR also takes the list
-# of modules from your initrd and adds that to MODULES_LOAD.
+# We also load modules listed in /etc/modules.
+# The order is
+# 1) /etc/modules
+# 2) MODULES_LOAD
+# 3) modules loaded by udev or systemd.
+# ReaR also takes the list of modules from your initrd and adds that to MODULES_LOAD.
 MODULES_LOAD=()
 #
 # Kernel modules to exclude from the rescue/recovery system.
@@ -2411,20 +2414,25 @@ COPY_AS_IS_TSM=( /etc/adsm
 # Additionally you need to add your custom configuration files like Includes and Excludes files.
 # An alternative method to reduce the size of the TSM client in ReaR recovery system initrd
 # is to exclude what is not needed from the above specified COPY_AS_IS_TSM via COPY_AS_IS_EXCLUDE_TSM.
-# For example language files (except for the EN_US language) are not needed so for example
+# Usually language files (except for the EN_US language) are not needed so for example
 # COPY_AS_IS_EXCLUDE_TSM=( /opt/tivoli/tsm/client/ba/bin/*.jar
 #                          /opt/tivoli/tsm/client/ba/bin/*.log*
 #                          /opt/tivoli/tsm/client/*/*/[A-Z][!N]_?? )
-# excludes in particular all language files except the EN_US language subdirectory,
+# excludes in particular language file subdirectories except the EN_US language subdirectory,
 # cf. https://github.com/rear/rear/issues/3189#issuecomment-2079811746
 COPY_AS_IS_EXCLUDE_TSM=( )
 # Generic methods to reduce the size of the ReaR recovery system initrd in particular on POWER architecture:
-# Kernel modules that are not required to run the ReaR recovery system on replacement hardware or VM
-# are not needed in the ReaR recovery system initrd so on fully compatible replacement hardware
-# MODULES=( 'loaded_modules' ) could be used, see the MODULES description above.
-# Better (but slower) compression for the ReaR recovery system initrd like
-# REAR_INITRD_COMPRESSION="lzma" could be used, see REAR_INITRD_COMPRESSION above,
-# cf. https://github.com/rear/rear/issues/3189#issuecomment-2079794186
+# - Kernel modules that are not required to run the ReaR recovery system on replacement hardware or VM
+#   are not needed in the ReaR recovery system initrd so on fully compatible replacement hardware
+#   MODULES=( 'loaded_modules' ) could be used, see the MODULES description above.
+# - On POWER architecture (e.g. PowerVM LPAR) normally no firmware files are required to run the system
+#   so we set FIRMWARE_FILES=( 'no' ) in usr/share/rear/conf/Linux-ppc64.conf and .../Linux-ppc64le.conf
+#   when the default FIRMWARE_FILES=() is used (see FIRMWARE_FILES above)
+#   so on POWER by default no firmware files are included in the ReaR recovery system initrd
+#   cf. https://github.com/rear/rear/issues/3189#issuecomment-2076960341
+# - Better (but slower) compression for the ReaR recovery system initrd like
+#   REAR_INITRD_COMPRESSION="lzma" could be used (see REAR_INITRD_COMPRESSION above),
+#   cf. https://github.com/rear/rear/issues/3189#issuecomment-2079794186
 #
 PROGS_TSM=(dsmc)
 #