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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# ACPI Configuration
3#
4
Jan Engelhardt3f2c48c2007-07-03 01:40:59 -04005menuconfig ACPI
Frans Pop355ee5e2007-10-29 17:20:38 -04006 bool "ACPI (Advanced Configuration and Power Interface) Support"
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 depends on !IA64_HP_SIM
8 depends on IA64 || X86
Adrian Bunk13001242006-03-28 17:04:00 -05009 depends on PCI
Len Brown243b66e2007-02-15 22:34:36 -050010 select PNP
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 default y
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070012 help
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 Advanced Configuration and Power Interface (ACPI) support for
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070014 Linux requires an ACPI-compliant platform (hardware/firmware),
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 and assumes the presence of OS-directed configuration and power
16 management (OSPM) software. This option will enlarge your
17 kernel by about 70K.
18
19 Linux ACPI provides a robust functional replacement for several
20 legacy configuration and power management interfaces, including
21 the Plug-and-Play BIOS specification (PnP BIOS), the
22 MultiProcessor Specification (MPS), and the Advanced Power
23 Management (APM) specification. If both ACPI and APM support
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070024 are configured, ACPI is used.
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070026 The project home page for the Linux ACPI subsystem is here:
Rafael J. Wysockiaaf3d292013-10-10 23:25:58 +020027 <https://01.org/linux-acpi>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29 Linux support for ACPI is based on Intel Corporation's ACPI
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070030 Component Architecture (ACPI CA). For more information on the
31 ACPI CA, see:
32 <http://acpica.org/>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070034 ACPI is an open industry specification co-developed by
35 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba.
36 The specification is available at:
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 <http://www.acpi.info>
38
Len Brown3e11c3c2005-05-27 04:53:27 -040039if ACPI
40
Len Brown673d5b42007-07-28 03:33:16 -040041config ACPI_SLEEP
42 bool
Rafael J. Wysocki5d1e0722008-10-22 14:58:43 -040043 depends on SUSPEND || HIBERNATION
Len Brown673d5b42007-07-28 03:33:16 -040044 default y
45
Zhang Ruib981c592007-01-29 11:02:30 +080046config ACPI_PROCFS
Len Brownfb804712007-07-24 01:50:46 -040047 bool "Deprecated /proc/acpi files"
48 depends on PROC_FS
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070049 help
Len Brownfb804712007-07-24 01:50:46 -040050 For backwards compatibility, this option allows
Rolf Eike Beer405bbe92007-10-20 03:10:57 +020051 deprecated /proc/acpi/ files to exist, even when
Len Brownfb804712007-07-24 01:50:46 -040052 they have been replaced by functions in /sys.
Len Brownfb804712007-07-24 01:50:46 -040053
Len Brownfb804712007-07-24 01:50:46 -040054 This option has no effect on /proc/acpi/ files
55 and functions which do not yet exist in /sys.
56
57 Say N to delete /proc/acpi/ files that have moved to /sys/
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070058
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030059config ACPI_PROCFS_POWER
Alan Cox9e527972008-01-03 16:31:42 +000060 bool "Deprecated power /proc/acpi directories"
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030061 depends on PROC_FS
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070062 help
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030063 For backwards compatibility, this option allows
Alan Cox9e527972008-01-03 16:31:42 +000064 deprecated power /proc/acpi/ directories to exist, even when
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030065 they have been replaced by functions in /sys.
Alan Cox9e527972008-01-03 16:31:42 +000066 The deprecated directories (and their replacements) include:
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030067 /proc/acpi/battery/* (/sys/class/power_supply/*)
68 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
Alan Cox9e527972008-01-03 16:31:42 +000069 This option has no effect on /proc/acpi/ directories
Alexey Starikovskiyfdcedbb2007-11-19 16:33:45 +030070 and functions, which do not yet exist in /sys
Zhang Rui6d855fc2011-01-10 11:16:30 +080071 This option, together with the proc directories, will be
72 deleted in 2.6.39.
Zhang Ruib981c592007-01-29 11:02:30 +080073
Alan Cox9e527972008-01-03 16:31:42 +000074 Say N to delete power /proc/acpi/ directories that have moved to /sys/
75
Thomas Renninger1195a092010-07-16 13:11:31 +020076config ACPI_EC_DEBUGFS
77 tristate "EC read/write access through /sys/kernel/debug/ec"
Thomas Renninger500de3dd2010-07-29 22:30:24 +020078 default n
Thomas Renninger1195a092010-07-16 13:11:31 +020079 help
80 Say N to disable Embedded Controller /sys/kernel/debug interface
81
Thomas Renninger500de3dd2010-07-29 22:30:24 +020082 Be aware that using this interface can confuse your Embedded
83 Controller in a way that a normal reboot is not enough. You then
Andrea Gelmini25cb1bf2010-08-18 15:22:10 +020084 have to power off your system, and remove the laptop battery for
Thomas Renninger500de3dd2010-07-29 22:30:24 +020085 some seconds.
Thomas Renninger1195a092010-07-16 13:11:31 +020086 An Embedded Controller typically is available on laptops and reads
87 sensor values like battery state and temperature.
Thomas Renninger500de3dd2010-07-29 22:30:24 +020088 The kernel accesses the EC through ACPI parsed code provided by BIOS
89 tables. This option allows to access the EC directly without ACPI
90 code being involved.
Thomas Renninger1195a092010-07-16 13:11:31 +020091 Thus this option is a debug option that helps to write ACPI drivers
92 and can be used to identify ACPI code or EC firmware bugs.
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094config ACPI_AC
95 tristate "AC Adapter"
Alexey Starikovskiy5527c8b2007-10-29 17:08:59 -040096 depends on X86
Zhang Rui1b3d4c32010-10-08 13:54:57 +080097 select POWER_SUPPLY
Len Brown07fefe42005-08-25 12:22:04 -040098 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700100 This driver supports the AC Adapter object, which indicates
101 whether a system is on AC or not. If you have a system that can
Len Brown07fefe42005-08-25 12:22:04 -0400102 switch between A/C and battery, say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700104 To compile this driver as a module, choose M here:
105 the module will be called ac.
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107config ACPI_BATTERY
108 tristate "Battery"
Alexey Starikovskiy5527c8b2007-10-29 17:08:59 -0400109 depends on X86
Zhang Rui1b3d4c32010-10-08 13:54:57 +0800110 select POWER_SUPPLY
Len Brown07fefe42005-08-25 12:22:04 -0400111 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 help
113 This driver adds support for battery information through
114 /proc/acpi/battery. If you have a mobile system with a battery,
115 say Y.
116
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700117 To compile this driver as a module, choose M here:
118 the module will be called battery.
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120config ACPI_BUTTON
121 tristate "Button"
Dmitry Torokhovc0968f02006-11-09 00:40:13 -0500122 depends on INPUT
Len Brown07fefe42005-08-25 12:22:04 -0400123 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700125 This driver handles events on the power, sleep, and lid buttons.
Len Brown07fefe42005-08-25 12:22:04 -0400126 A daemon reads /proc/acpi/event and perform user-defined actions
127 such as shutting down the system. This is necessary for
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700128 software-controlled poweroff.
129
130 To compile this driver as a module, choose M here:
131 the module will be called button.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133config ACPI_VIDEO
134 tristate "Video"
Luming Yu23b0f012007-05-09 21:07:05 +0800135 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
Andreas Herrmann03e2bf22007-09-17 23:41:05 +0200136 depends on INPUT
Zhang Rui63c4ec92008-04-21 16:07:13 +0800137 select THERMAL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700139 This driver implements the ACPI Extensions For Display Adapters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 for integrated graphics devices on motherboard, as specified in
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700141 ACPI 2.0 Specification, Appendix B. This supports basic operations
142 such as defining the video POST device, retrieving EDID information,
143 and setting up a video output.
144
145 To compile this driver as a module, choose M here:
146 the module will be called video.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148config ACPI_FAN
149 tristate "Fan"
Zhang Rui63c4ec92008-04-21 16:07:13 +0800150 select THERMAL
Len Brown07fefe42005-08-25 12:22:04 -0400151 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700153 This driver supports ACPI fan devices, allowing user-mode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 applications to perform basic fan control (on, off, status).
155
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700156 To compile this driver as a module, choose M here:
157 the module will be called fan.
158
Len Brownc8f7a622006-07-09 17:22:28 -0400159config ACPI_DOCK
Shaohua Li898b0542008-09-27 11:10:28 +0800160 bool "Dock"
Len Brownc8f7a622006-07-09 17:22:28 -0400161 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700162 This driver supports ACPI-controlled docking stations and removable
163 drive bays such as the IBM Ultrabay and the Dell Module Bay.
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165config ACPI_PROCESSOR
166 tristate "Processor"
Zhang Rui63c4ec92008-04-21 16:07:13 +0800167 select THERMAL
Jean Delvarea4084c12010-10-10 14:54:52 +0200168 select CPU_IDLE
Len Brown07fefe42005-08-25 12:22:04 -0400169 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700171 This driver installs ACPI as the idle handler for Linux and uses
172 ACPI C2 and C3 processor states to save power on systems that
Len Brown07fefe42005-08-25 12:22:04 -0400173 support it. It is required by several flavors of cpufreq
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700174 performance-state drivers.
175
176 To compile this driver as a module, choose M here:
177 the module will be called processor.
Zhao Yakuie92b2972010-12-08 10:10:18 +0800178config ACPI_IPMI
179 tristate "IPMI"
Kees Cookf756f282013-01-16 18:53:28 -0800180 depends on IPMI_SI && IPMI_HANDLER
Zhao Yakuie92b2972010-12-08 10:10:18 +0800181 default n
182 help
183 This driver enables the ACPI to access the BMC controller. And it
184 uses the IPMI request/response message to communicate with BMC
185 controller, which can be found on on the server.
186
187 To compile this driver as a module, choose M here:
188 the module will be called as acpi_ipmi.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
190config ACPI_HOTPLUG_CPU
Adrian Bunkcbfc1ba2005-07-30 04:18:00 -0400191 bool
Kees Cookf756f282013-01-16 18:53:28 -0800192 depends on ACPI_PROCESSOR && HOTPLUG_CPU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 select ACPI_CONTAINER
Adrian Bunkcbfc1ba2005-07-30 04:18:00 -0400194 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Shaohua Li8e0af512009-07-27 18:11:02 -0400196config ACPI_PROCESSOR_AGGREGATOR
197 tristate "Processor Aggregator"
198 depends on ACPI_PROCESSOR
Len Brownd91f79e2009-09-27 02:35:55 -0400199 depends on X86
Shaohua Li8e0af512009-07-27 18:11:02 -0400200 help
201 ACPI 4.0 defines processor Aggregator, which enables OS to perform
Jiri Slabyc4c4e2a2009-10-09 15:53:24 +0200202 specific processor configuration and control that applies to all
Shaohua Li8e0af512009-07-27 18:11:02 -0400203 processors in the platform. Currently only logical processor idling
204 is defined, which is to reduce power consumption. This driver
Jiri Slabyc4c4e2a2009-10-09 15:53:24 +0200205 supports the new device.
Shaohua Li8e0af512009-07-27 18:11:02 -0400206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207config ACPI_THERMAL
208 tristate "Thermal Zone"
209 depends on ACPI_PROCESSOR
Zhang Rui3f655ef2008-01-17 15:51:11 +0800210 select THERMAL
Len Brown07fefe42005-08-25 12:22:04 -0400211 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700213 This driver supports ACPI thermal zones. Most mobile and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 some desktop systems support ACPI thermal zones. It is HIGHLY
215 recommended that this option be enabled, as your processor(s)
216 may be damaged without it.
217
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700218 To compile this driver as a module, choose M here:
219 the module will be called thermal.
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221config ACPI_NUMA
222 bool "NUMA support"
223 depends on NUMA
Yasunori Goto762834e2006-06-23 02:03:19 -0700224 depends on (X86 || IA64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 default y if IA64_GENERIC || IA64_SGI_SN2
226
Randy Dunlap7ce95732008-02-22 11:25:04 -0800227config ACPI_CUSTOM_DSDT_FILE
228 string "Custom DSDT Table file to include"
229 default ""
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 depends on !STANDALONE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 help
Len Brownd89e9d62008-02-06 19:28:02 -0500232 This option supports a custom DSDT by linking it into the kernel.
233 See Documentation/acpi/dsdt-override.txt
234
Uwe Zeisbergerc30fe7f2006-03-24 18:23:14 +0100235 Enter the full path name to the file which includes the AmlCode
236 declaration.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Randy Dunlap7ce95732008-02-22 11:25:04 -0800238 If unsure, don't enter a file name.
239
240config ACPI_CUSTOM_DSDT
241 bool
242 default ACPI_CUSTOM_DSDT_FILE != ""
243
Thomas Renninger53aac442012-10-01 00:23:54 +0200244config ACPI_INITRD_TABLE_OVERRIDE
Thomas Renninger565d9562013-02-22 14:12:22 +0100245 bool "ACPI tables override via initrd"
246 depends on BLK_DEV_INITRD && X86
Thomas Renninger53aac442012-10-01 00:23:54 +0200247 default n
248 help
249 This option provides functionality to override arbitrary ACPI tables
250 via initrd. No functional change if no ACPI tables are passed via
251 initrd, therefore it's safe to say Y.
252 See Documentation/acpi/initrd_table_override.txt for details
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254config ACPI_BLACKLIST_YEAR
Andi Kleen2eb1bdb2006-02-26 04:18:43 +0100255 int "Disable ACPI for systems before Jan 1st this year" if X86_32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 default 0
257 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700258 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 on platforms with DMI BIOS date before January 1st that year.
260 "acpi=force" can be used to override this mechanism.
261
262 Enter 0 to disable this mechanism and allow ACPI to
263 run by default no matter what the year. (default)
264
265config ACPI_DEBUG
266 bool "Debug Statements"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 default n
268 help
Bjorn Helgaasa0d84a92008-11-07 16:58:05 -0700269 The ACPI subsystem can produce debug output. Saying Y enables this
270 output and increases the kernel size by around 50K.
271
272 Use the acpi.debug_layer and acpi.debug_level kernel command-line
273 parameters documented in Documentation/acpi/debug.txt and
274 Documentation/kernel-parameters.txt to control the type and
275 amount of debug output.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Alex Chiang8344b562008-06-10 15:30:42 -0600277config ACPI_PCI_SLOT
Jiang Liuab1a2e02013-01-19 00:07:42 +0800278 bool "PCI slot detection driver"
Alex Chiang268a03a2009-06-17 19:03:57 -0600279 depends on SYSFS
Alex Chiang8344b562008-06-10 15:30:42 -0600280 default n
281 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700282 This driver creates entries in /sys/bus/pci/slots/ for all PCI
283 slots in the system. This can help correlate PCI bus addresses,
284 i.e., segment/bus/device/function tuples, with physical slots in
285 the system. If you are unsure, say N.
286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287config X86_PM_TIMER
David Rientjes6a108a12011-01-20 14:44:16 -0800288 bool "Power Management Timer Support" if EXPERT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 depends on X86
Len Brown07fefe42005-08-25 12:22:04 -0400290 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 help
292 The Power Management Timer is available on all ACPI-capable,
293 in most cases even if ACPI is unusable or blacklisted.
294
Matt LaPlantec73a6682006-10-03 22:24:43 +0200295 This timing source is not affected by power management features
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 like aggressive processor idling, throttling, frequency and/or
297 voltage scaling, unlike the commonly used Time Stamp Counter
298 (TSC) timing source.
299
Andi Kleene78256b2006-02-26 04:18:37 +0100300 You should nearly always say Y here because many modern
301 systems require this timer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303config ACPI_CONTAINER
Linus Torvalds06991c22013-02-21 12:05:51 -0800304 bool "Container and Module Devices"
Paul Bolleea6a4582013-03-11 10:53:48 +0000305 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700306 help
307 This driver supports ACPI Container and Module devices (IDs
308 ACPI0004, PNP0A05, and PNP0A06).
Keiichiro Tokunaga45b1b192005-03-02 00:00:00 -0500309
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700310 This helps support hotplug of nodes, CPUs, and memory.
311
312 To compile this driver as a module, choose M here:
313 the module will be called container.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315config ACPI_HOTPLUG_MEMORY
Rafael J. Wysocki0a347642013-03-03 23:18:03 +0100316 bool "Memory Hotplug"
Yasunori Gotobc02af92006-06-27 02:53:30 -0700317 depends on MEMORY_HOTPLUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700319 This driver supports ACPI memory hotplug. The driver
320 fields notifications on ACPI memory devices (PNP0C80),
321 which represent memory ranges that may be onlined or
322 offlined during runtime.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700324 If your hardware and firmware do not support adding or
325 removing memory devices at runtime, you need not enable
326 this driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700328 To compile this driver as a module, choose M here:
329 the module will be called acpi_memhotplug.
Rich Townsend3f86b832006-07-01 11:36:54 -0400330
331config ACPI_SBS
Alexey Starikovskiy94f6c082007-09-26 19:43:48 +0400332 tristate "Smart Battery System"
Vladimir Lebedevb4150fc2007-03-19 17:45:50 +0300333 depends on X86
Zhang Rui1b3d4c32010-10-08 13:54:57 +0800334 select POWER_SUPPLY
Rich Townsend3f86b832006-07-01 11:36:54 -0400335 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700336 This driver supports the Smart Battery System, another
Alexey Starikovskiy94f6c082007-09-26 19:43:48 +0400337 type of access to battery information, found on some laptops.
Rich Townsend3f86b832006-07-01 11:36:54 -0400338
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700339 To compile this driver as a module, choose M here:
340 the modules will be called sbs and sbshc.
341
Huang Ying801eab82010-05-18 14:35:17 +0800342config ACPI_HED
343 tristate "Hardware Error Device"
344 help
345 This driver supports the Hardware Error Device (PNP0C33),
346 which is used to report some hardware errors notified via
347 SCI, mainly the corrected errors.
348
Thomas Renninger526b4af2011-05-26 12:26:24 +0200349config ACPI_CUSTOM_METHOD
350 tristate "Allow ACPI methods to be inserted/replaced at run time"
351 depends on DEBUG_FS
352 default n
353 help
Justin P. Mattockbd1b2a52012-01-03 08:49:48 -0800354 This debug facility allows ACPI AML methods to be inserted and/or
Thomas Renninger526b4af2011-05-26 12:26:24 +0200355 replaced without rebooting the system. For details refer to:
356 Documentation/acpi/method-customizing.txt.
357
358 NOTE: This option is security sensitive, because it allows arbitrary
359 kernel memory to be written to by root (uid=0) users, allowing them
360 to bypass certain security measures (e.g. if root is not allowed to
361 load additional kernel modules after boot, this feature may be used
362 to override that restriction).
363
Matthew Garrettd1ff4b12012-01-31 13:19:20 -0500364config ACPI_BGRT
Josh Triplett2223af32012-09-28 17:57:05 -0700365 bool "Boottime Graphics Resource Table support"
Tony Lucke66cd532013-04-03 13:17:20 +0200366 depends on EFI && X86
Matthew Garrettd1ff4b12012-01-31 13:19:20 -0500367 help
368 This driver adds support for exposing the ACPI Boottime Graphics
369 Resource Table, which allows the operating system to obtain
370 data from the firmware boot splash. It will appear under
371 /sys/firmware/acpi/bgrt/ .
372
Huang Yinga643ce22010-05-18 14:35:12 +0800373source "drivers/acpi/apei/Kconfig"
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375endif # ACPI