exosphere: allow memory mode to be used on retail

config_templates/exosphere.ini

@@ -15,6 +15,13 @@
 #  Desc: Controls whether userland has access to the PMU registers.
 #  NOTE: It is unknown what effects this has on official code.
 
+# Key: enable_mem_mode, default: 0.
+#  Desc: Controls whether boot config memory mode is taken into account
+#   for retail units. This does not affect development units.
+#  NOTE: On retail units max ram size is capped to 4GB.
+#   Enabling this will use the boot config memory mode parameter,
+#   which by default is auto and size gets set based on physical size.
+
 # Key: blank_prodinfo_sysmmc, default: 0.
 #  Desc: Controls whether PRODINFO should be blanked in sysmmc.
 #   This will cause the system to see dummied out keys and
@@ -51,6 +58,7 @@ debugmode=1
 debugmode_user=0
 disable_user_exception_handlers=0
 enable_user_pmu_access=0
+enable_mem_mode=0
 blank_prodinfo_sysmmc=0
 blank_prodinfo_emummc=0
 allow_writing_to_cal_sysmmc=0