Linux 4.7-rc2
[deliverable/linux.git] / arch / arm / Kconfig
CommitLineData
1da177e4
LT
1config ARM
2 bool
3 default y
b1b3f49c 4 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
21266be9 5 select ARCH_HAS_DEVMEM_IS_ALLOWED
2b68f6ca 6 select ARCH_HAS_ELF_RANDOMIZE
3d06770e 7 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
171b3f0d 8 select ARCH_HAVE_CUSTOM_GPIO_H
957e3fac 9 select ARCH_HAS_GCOV_PROFILE_ALL
d7018848 10 select ARCH_MIGHT_HAVE_PC_PARPORT
4badad35 11 select ARCH_SUPPORTS_ATOMIC_RMW
017f161a 12 select ARCH_USE_BUILTIN_BSWAP
0cbad9c9 13 select ARCH_USE_CMPXCHG_LOCKREF
b1b3f49c 14 select ARCH_WANT_IPC_PARSE_VERSION
ee951c63 15 select BUILDTIME_EXTABLE_SORT if MMU
171b3f0d 16 select CLONE_BACKWARDS
b1b3f49c 17 select CPU_PM if (SUSPEND || CPU_IDLE)
dce5c9e3 18 select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
b01aec9b
BP
19 select EDAC_SUPPORT
20 select EDAC_ATOMIC_SCRUB
36d0fd21 21 select GENERIC_ALLOCATOR
4477ca45 22 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
b1b3f49c 23 select GENERIC_CLOCKEVENTS_BROADCAST if SMP
2937367b 24 select GENERIC_EARLY_IOREMAP
171b3f0d 25 select GENERIC_IDLE_POLL_SETUP
b1b3f49c
RK
26 select GENERIC_IRQ_PROBE
27 select GENERIC_IRQ_SHOW
7c07005e 28 select GENERIC_IRQ_SHOW_LEVEL
b1b3f49c 29 select GENERIC_PCI_IOMAP
38ff87f7 30 select GENERIC_SCHED_CLOCK
b1b3f49c
RK
31 select GENERIC_SMP_IDLE_THREAD
32 select GENERIC_STRNCPY_FROM_USER
33 select GENERIC_STRNLEN_USER
a71b092a 34 select HANDLE_DOMAIN_IRQ
b1b3f49c 35 select HARDIRQS_SW_RESEND
7a017721 36 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
0b7857db 37 select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
437682ee
AB
38 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
39 select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
e0c25d95 40 select HAVE_ARCH_MMAP_RND_BITS if MMU
91702175 41 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
0693bf68 42 select HAVE_ARCH_TRACEHOOK
b329f95d 43 select HAVE_ARM_SMCCC if CPU_V7
6077776b 44 select HAVE_CBPF_JIT
51aaf81f 45 select HAVE_CC_STACKPROTECTOR
171b3f0d 46 select HAVE_CONTEXT_TRACKING
b1b3f49c
RK
47 select HAVE_C_RECORDMCOUNT
48 select HAVE_DEBUG_KMEMLEAK
49 select HAVE_DMA_API_DEBUG
b1b3f49c 50 select HAVE_DMA_CONTIGUOUS if MMU
437682ee 51 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32 && MMU
dce5c9e3 52 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
5f56a5df 53 select HAVE_EXIT_THREAD
b1b3f49c 54 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
0e341af8 55 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
b1b3f49c 56 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
1fe53268 57 select HAVE_GENERIC_DMA_COHERENT
b1b3f49c
RK
58 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
59 select HAVE_IDE if PCI || ISA || PCMCIA
87c46b6c 60 select HAVE_IRQ_TIME_ACCOUNTING
e7db7b42 61 select HAVE_KERNEL_GZIP
f9b493ac 62 select HAVE_KERNEL_LZ4
6e8699f7 63 select HAVE_KERNEL_LZMA
b1b3f49c 64 select HAVE_KERNEL_LZO
a7f464f3 65 select HAVE_KERNEL_XZ
cb1293e2 66 select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
b1b3f49c
RK
67 select HAVE_KRETPROBES if (HAVE_KPROBES)
68 select HAVE_MEMBLOCK
7d485f64 69 select HAVE_MOD_ARCH_SPECIFIC
42a0bb3f 70 select HAVE_NMI
b1b3f49c 71 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
0dc016db 72 select HAVE_OPTPROBES if !THUMB2_KERNEL
7ada189f 73 select HAVE_PERF_EVENTS
49863894
WD
74 select HAVE_PERF_REGS
75 select HAVE_PERF_USER_STACK_DUMP
a0ad5496 76 select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
e513f8bf 77 select HAVE_REGS_AND_STACK_ACCESS_API
b1b3f49c 78 select HAVE_SYSCALL_TRACEPOINTS
af1839eb 79 select HAVE_UID16
31c1fc81 80 select HAVE_VIRT_CPU_ACCOUNTING_GEN
da0ec6f7 81 select IRQ_FORCED_THREADING
171b3f0d 82 select MODULES_USE_ELF_REL
84f452b1 83 select NO_BOOTMEM
aa7d5f18
AB
84 select OF_EARLY_FLATTREE if OF
85 select OF_RESERVED_MEM if OF
171b3f0d
RK
86 select OLD_SIGACTION
87 select OLD_SIGSUSPEND3
b1b3f49c
RK
88 select PERF_USE_VMALLOC
89 select RTC_LIB
90 select SYS_SUPPORTS_APM_EMULATION
171b3f0d
RK
91 # Above selects are sorted alphabetically; please add new ones
92 # according to that. Thanks.
1da177e4
LT
93 help
94 The ARM series is a line of low-power-consumption RISC chip designs
f6c8965a 95 licensed by ARM Ltd and targeted at embedded applications and
1da177e4 96 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
f6c8965a 97 manufactured, but legacy ARM-based PC hardware remains popular in
1da177e4
LT
98 Europe. There is an ARM Linux project with a web page at
99 <http://www.arm.linux.org.uk/>.
100
74facffe 101config ARM_HAS_SG_CHAIN
308c09f1 102 select ARCH_HAS_SG_CHAIN
74facffe
RK
103 bool
104
4ce63fcd
MS
105config NEED_SG_DMA_LENGTH
106 bool
107
108config ARM_DMA_USE_IOMMU
4ce63fcd 109 bool
b1b3f49c
RK
110 select ARM_HAS_SG_CHAIN
111 select NEED_SG_DMA_LENGTH
4ce63fcd 112
60460abf
SWK
113if ARM_DMA_USE_IOMMU
114
115config ARM_DMA_IOMMU_ALIGNMENT
116 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
117 range 4 9
118 default 8
119 help
120 DMA mapping framework by default aligns all buffers to the smallest
121 PAGE_SIZE order which is greater than or equal to the requested buffer
122 size. This works well for buffers up to a few hundreds kilobytes, but
123 for larger buffers it just a waste of address space. Drivers which has
124 relatively small addressing window (like 64Mib) might run out of
125 virtual space with just a few allocations.
126
127 With this parameter you can specify the maximum PAGE_SIZE order for
128 DMA IOMMU buffers. Larger buffers will be aligned only to this
129 specified order. The order is expressed as a power of two multiplied
130 by the PAGE_SIZE.
131
132endif
133
0b05da72
HUK
134config MIGHT_HAVE_PCI
135 bool
136
75e7153a
RB
137config SYS_SUPPORTS_APM_EMULATION
138 bool
139
bc581770
LW
140config HAVE_TCM
141 bool
142 select GENERIC_ALLOCATOR
143
e119bfff
RK
144config HAVE_PROC_CPU
145 bool
146
ce816fa8 147config NO_IOPORT_MAP
5ea81769 148 bool
5ea81769 149
1da177e4
LT
150config EISA
151 bool
152 ---help---
153 The Extended Industry Standard Architecture (EISA) bus was
154 developed as an open alternative to the IBM MicroChannel bus.
155
156 The EISA bus provided some of the features of the IBM MicroChannel
157 bus while maintaining backward compatibility with cards made for
158 the older ISA bus. The EISA bus saw limited use between 1988 and
159 1995 when it was made obsolete by the PCI bus.
160
161 Say Y here if you are building a kernel for an EISA-based machine.
162
163 Otherwise, say N.
164
165config SBUS
166 bool
167
f16fb1ec
RK
168config STACKTRACE_SUPPORT
169 bool
170 default y
171
172config LOCKDEP_SUPPORT
173 bool
174 default y
175
7ad1bcb2
RK
176config TRACE_IRQFLAGS_SUPPORT
177 bool
cb1293e2 178 default !CPU_V7M
7ad1bcb2 179
1da177e4
LT
180config RWSEM_XCHGADD_ALGORITHM
181 bool
8a87411b 182 default y
1da177e4 183
f0d1b0b3
DH
184config ARCH_HAS_ILOG2_U32
185 bool
f0d1b0b3
DH
186
187config ARCH_HAS_ILOG2_U64
188 bool
f0d1b0b3 189
4a1b5733
EV
190config ARCH_HAS_BANDGAP
191 bool
192
a5f4c561
SA
193config FIX_EARLYCON_MEM
194 def_bool y if MMU
195
b89c3b16
AM
196config GENERIC_HWEIGHT
197 bool
198 default y
199
1da177e4
LT
200config GENERIC_CALIBRATE_DELAY
201 bool
202 default y
203
a08b6b79
Z
204config ARCH_MAY_HAVE_PC_FDC
205 bool
206
5ac6da66
CL
207config ZONE_DMA
208 bool
5ac6da66 209
ccd7ab7f
FT
210config NEED_DMA_MAP_STATE
211 def_bool y
212
c7edc9e3
DL
213config ARCH_SUPPORTS_UPROBES
214 def_bool y
215
58af4a24
RH
216config ARCH_HAS_DMA_SET_COHERENT_MASK
217 bool
218
1da177e4
LT
219config GENERIC_ISA_DMA
220 bool
221
1da177e4
LT
222config FIQ
223 bool
224
13a5045d
RH
225config NEED_RET_TO_USER
226 bool
227
034d2f5a
AV
228config ARCH_MTD_XIP
229 bool
230
c760fc19
HC
231config VECTORS_BASE
232 hex
6afd6fae 233 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
c760fc19
HC
234 default DRAM_BASE if REMAP_VECTORS_TO_RAM
235 default 0x00000000
236 help
19accfd3
RK
237 The base address of exception vectors. This must be two pages
238 in size.
c760fc19 239
dc21af99 240config ARM_PATCH_PHYS_VIRT
c1becedc
RK
241 bool "Patch physical to virtual translations at runtime" if EMBEDDED
242 default y
b511d75d 243 depends on !XIP_KERNEL && MMU
dc21af99 244 help
111e9a5c
RK
245 Patch phys-to-virt and virt-to-phys translation functions at
246 boot and module load time according to the position of the
247 kernel in system memory.
dc21af99 248
111e9a5c 249 This can only be used with non-XIP MMU kernels where the base
daece596 250 of physical memory is at a 16MB boundary.
dc21af99 251
c1becedc
RK
252 Only disable this option if you know that you do not require
253 this feature (eg, building a kernel for a single machine) and
254 you need to shrink the kernel to the minimal size.
dc21af99 255
c334bc15
RH
256config NEED_MACH_IO_H
257 bool
258 help
259 Select this when mach/io.h is required to provide special
260 definitions for this platform. The need for mach/io.h should
261 be avoided when possible.
262
0cdc8b92 263config NEED_MACH_MEMORY_H
1b9f95f8
NP
264 bool
265 help
0cdc8b92
NP
266 Select this when mach/memory.h is required to provide special
267 definitions for this platform. The need for mach/memory.h should
268 be avoided when possible.
dc21af99 269
1b9f95f8 270config PHYS_OFFSET
974c0724 271 hex "Physical address of main memory" if MMU
c6f54a9b 272 depends on !ARM_PATCH_PHYS_VIRT
974c0724 273 default DRAM_BASE if !MMU
c6f54a9b 274 default 0x00000000 if ARCH_EBSA110 || \
c6f54a9b
UKK
275 ARCH_FOOTBRIDGE || \
276 ARCH_INTEGRATOR || \
277 ARCH_IOP13XX || \
278 ARCH_KS8695 || \
279 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
280 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
281 default 0x20000000 if ARCH_S5PV210
282 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
b8824c9a 283 default 0xc0000000 if ARCH_SA1100
111e9a5c 284 help
1b9f95f8
NP
285 Please provide the physical address corresponding to the
286 location of main memory in your system.
cada3c08 287
87e040b6
SG
288config GENERIC_BUG
289 def_bool y
290 depends on BUG
291
1bcad26e
KS
292config PGTABLE_LEVELS
293 int
294 default 3 if ARM_LPAE
295 default 2
296
1da177e4
LT
297source "init/Kconfig"
298
dc52ddc0
MH
299source "kernel/Kconfig.freezer"
300
1da177e4
LT
301menu "System Type"
302
3c427975
HC
303config MMU
304 bool "MMU-based Paged Memory Management Support"
305 default y
306 help
307 Select if you want MMU-based virtualised addressing space
308 support by paged memory management. If unsure, say 'Y'.
309
e0c25d95
DC
310config ARCH_MMAP_RND_BITS_MIN
311 default 8
312
313config ARCH_MMAP_RND_BITS_MAX
314 default 14 if PAGE_OFFSET=0x40000000
315 default 15 if PAGE_OFFSET=0x80000000
316 default 16
317
ccf50e23
RK
318#
319# The "ARM system type" choice list is ordered alphabetically by option
320# text. Please add new entries in the option alphabetic order.
321#
1da177e4
LT
322choice
323 prompt "ARM system type"
70722803 324 default ARM_SINGLE_ARMV7M if !MMU
1420b22b 325 default ARCH_MULTIPLATFORM if MMU
1da177e4 326
387798b3
RH
327config ARCH_MULTIPLATFORM
328 bool "Allow multiple platforms to be selected"
b1b3f49c 329 depends on MMU
ddb902cc 330 select ARCH_WANT_OPTIONAL_GPIOLIB
42dc836d 331 select ARM_HAS_SG_CHAIN
387798b3
RH
332 select ARM_PATCH_PHYS_VIRT
333 select AUTO_ZRELADDR
6d0add40 334 select CLKSRC_OF
66314223 335 select COMMON_CLK
ddb902cc 336 select GENERIC_CLOCKEVENTS
08d38beb 337 select MIGHT_HAVE_PCI
387798b3 338 select MULTI_IRQ_HANDLER
66314223
DN
339 select SPARSE_IRQ
340 select USE_OF
66314223 341
9c77bc43
SA
342config ARM_SINGLE_ARMV7M
343 bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
344 depends on !MMU
345 select ARCH_WANT_OPTIONAL_GPIOLIB
346 select ARM_NVIC
499f1640 347 select AUTO_ZRELADDR
9c77bc43
SA
348 select CLKSRC_OF
349 select COMMON_CLK
350 select CPU_V7M
351 select GENERIC_CLOCKEVENTS
352 select NO_IOPORT_MAP
353 select SPARSE_IRQ
354 select USE_OF
355
4af6fee1 356
93e22567
RK
357config ARCH_CLPS711X
358 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
a3b8d4a5 359 select ARCH_REQUIRE_GPIOLIB
ea7d1bc9 360 select AUTO_ZRELADDR
c99f72ad 361 select CLKSRC_MMIO
93e22567
RK
362 select COMMON_CLK
363 select CPU_ARM720T
4a8355c4 364 select GENERIC_CLOCKEVENTS
6597619f 365 select MFD_SYSCON
e4e3a37d 366 select SOC_BUS
93e22567
RK
367 help
368 Support for Cirrus Logic 711x/721x/731x based boards.
369
788c9700
RK
370config ARCH_GEMINI
371 bool "Cortina Systems Gemini"
788c9700 372 select ARCH_REQUIRE_GPIOLIB
f3372c01 373 select CLKSRC_MMIO
b1b3f49c 374 select CPU_FA526
f3372c01 375 select GENERIC_CLOCKEVENTS
788c9700
RK
376 help
377 Support for the Cortina Systems Gemini family SoCs
378
1da177e4
LT
379config ARCH_EBSA110
380 bool "EBSA-110"
b1b3f49c 381 select ARCH_USES_GETTIMEOFFSET
c750815e 382 select CPU_SA110
f7e68bbf 383 select ISA
c334bc15 384 select NEED_MACH_IO_H
0cdc8b92 385 select NEED_MACH_MEMORY_H
ce816fa8 386 select NO_IOPORT_MAP
1da177e4
LT
387 help
388 This is an evaluation board for the StrongARM processor available
f6c8965a 389 from Digital. It has limited hardware on-board, including an
1da177e4
LT
390 Ethernet interface, two PCMCIA sockets, two serial ports and a
391 parallel port.
392
e7736d47
LB
393config ARCH_EP93XX
394 bool "EP93xx-based"
b1b3f49c
RK
395 select ARCH_HAS_HOLES_MEMORYMODEL
396 select ARCH_REQUIRE_GPIOLIB
e7736d47 397 select ARM_AMBA
b8824c9a 398 select ARM_PATCH_PHYS_VIRT
e7736d47 399 select ARM_VIC
b8824c9a 400 select AUTO_ZRELADDR
6d803ba7 401 select CLKDEV_LOOKUP
000bc178 402 select CLKSRC_MMIO
b1b3f49c 403 select CPU_ARM920T
000bc178 404 select GENERIC_CLOCKEVENTS
e7736d47
LB
405 help
406 This enables support for the Cirrus EP93xx series of CPUs.
407
1da177e4
LT
408config ARCH_FOOTBRIDGE
409 bool "FootBridge"
c750815e 410 select CPU_SA110
1da177e4 411 select FOOTBRIDGE
4e8d7637 412 select GENERIC_CLOCKEVENTS
d0ee9f40 413 select HAVE_IDE
8ef6e620 414 select NEED_MACH_IO_H if !MMU
0cdc8b92 415 select NEED_MACH_MEMORY_H
f999b8bd
MM
416 help
417 Support for systems based on the DC21285 companion chip
418 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
1da177e4 419
4af6fee1
DS
420config ARCH_NETX
421 bool "Hilscher NetX based"
b1b3f49c 422 select ARM_VIC
234b6ced 423 select CLKSRC_MMIO
c750815e 424 select CPU_ARM926T
2fcfe6b8 425 select GENERIC_CLOCKEVENTS
f999b8bd 426 help
4af6fee1
DS
427 This enables support for systems based on the Hilscher NetX Soc
428
3b938be6
RK
429config ARCH_IOP13XX
430 bool "IOP13xx-based"
431 depends on MMU
b1b3f49c 432 select CPU_XSC3
0cdc8b92 433 select NEED_MACH_MEMORY_H
13a5045d 434 select NEED_RET_TO_USER
b1b3f49c
RK
435 select PCI
436 select PLAT_IOP
437 select VMSPLIT_1G
37ebbcff 438 select SPARSE_IRQ
3b938be6
RK
439 help
440 Support for Intel's IOP13XX (XScale) family of processors.
441
3f7e5815
LB
442config ARCH_IOP32X
443 bool "IOP32x-based"
a4f7e763 444 depends on MMU
b1b3f49c 445 select ARCH_REQUIRE_GPIOLIB
c750815e 446 select CPU_XSCALE
e9004f50 447 select GPIO_IOP
13a5045d 448 select NEED_RET_TO_USER
f7e68bbf 449 select PCI
b1b3f49c 450 select PLAT_IOP
f999b8bd 451 help
3f7e5815
LB
452 Support for Intel's 80219 and IOP32X (XScale) family of
453 processors.
454
455config ARCH_IOP33X
456 bool "IOP33x-based"
457 depends on MMU
b1b3f49c 458 select ARCH_REQUIRE_GPIOLIB
c750815e 459 select CPU_XSCALE
e9004f50 460 select GPIO_IOP
13a5045d 461 select NEED_RET_TO_USER
3f7e5815 462 select PCI
b1b3f49c 463 select PLAT_IOP
3f7e5815
LB
464 help
465 Support for Intel's IOP33X (XScale) family of processors.
1da177e4 466
3b938be6
RK
467config ARCH_IXP4XX
468 bool "IXP4xx-based"
a4f7e763 469 depends on MMU
58af4a24 470 select ARCH_HAS_DMA_SET_COHERENT_MASK
b1b3f49c 471 select ARCH_REQUIRE_GPIOLIB
51aaf81f 472 select ARCH_SUPPORTS_BIG_ENDIAN
234b6ced 473 select CLKSRC_MMIO
c750815e 474 select CPU_XSCALE
b1b3f49c 475 select DMABOUNCE if PCI
3b938be6 476 select GENERIC_CLOCKEVENTS
0b05da72 477 select MIGHT_HAVE_PCI
c334bc15 478 select NEED_MACH_IO_H
9296d94d 479 select USB_EHCI_BIG_ENDIAN_DESC
171b3f0d 480 select USB_EHCI_BIG_ENDIAN_MMIO
c4713074 481 help
3b938be6 482 Support for Intel's IXP4XX (XScale) family of processors.
c4713074 483
edabd38e
SB
484config ARCH_DOVE
485 bool "Marvell Dove"
edabd38e 486 select ARCH_REQUIRE_GPIOLIB
756b2531 487 select CPU_PJ4
edabd38e 488 select GENERIC_CLOCKEVENTS
0f81bd43 489 select MIGHT_HAVE_PCI
b8cd337c 490 select MULTI_IRQ_HANDLER
171b3f0d 491 select MVEBU_MBUS
9139acd1
SH
492 select PINCTRL
493 select PINCTRL_DOVE
abcda1dc 494 select PLAT_ORION_LEGACY
0bd86961 495 select SPARSE_IRQ
c5d431e8 496 select PM_GENERIC_DOMAINS if PM
788c9700 497 help
edabd38e 498 Support for the Marvell Dove SoC 88AP510
788c9700
RK
499
500config ARCH_KS8695
501 bool "Micrel/Kendin KS8695"
98830bc9 502 select ARCH_REQUIRE_GPIOLIB
c7e783d6 503 select CLKSRC_MMIO
b1b3f49c 504 select CPU_ARM922T
c7e783d6 505 select GENERIC_CLOCKEVENTS
b1b3f49c 506 select NEED_MACH_MEMORY_H
788c9700
RK
507 help
508 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
509 System-on-Chip devices.
510
788c9700
RK
511config ARCH_W90X900
512 bool "Nuvoton W90X900 CPU"
c52d3d68 513 select ARCH_REQUIRE_GPIOLIB
6d803ba7 514 select CLKDEV_LOOKUP
6fa5d5f7 515 select CLKSRC_MMIO
b1b3f49c 516 select CPU_ARM926T
58b5369e 517 select GENERIC_CLOCKEVENTS
788c9700 518 help
a8bc4ead 519 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
520 At present, the w90x900 has been renamed nuc900, regarding
521 the ARM series product line, you can login the following
522 link address to know more.
523
524 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
525 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
788c9700 526
93e22567
RK
527config ARCH_LPC32XX
528 bool "NXP LPC32XX"
529 select ARCH_REQUIRE_GPIOLIB
530 select ARM_AMBA
531 select CLKDEV_LOOKUP
c227f127
VZ
532 select CLKSRC_LPC32XX
533 select COMMON_CLK
93e22567
RK
534 select CPU_ARM926T
535 select GENERIC_CLOCKEVENTS
8cb17b5e
VZ
536 select MULTI_IRQ_HANDLER
537 select SPARSE_IRQ
93e22567
RK
538 select USE_OF
539 help
540 Support for the NXP LPC32XX family of processors
541
1da177e4 542config ARCH_PXA
2c8086a5 543 bool "PXA2xx/PXA3xx-based"
a4f7e763 544 depends on MMU
b1b3f49c
RK
545 select ARCH_MTD_XIP
546 select ARCH_REQUIRE_GPIOLIB
547 select ARM_CPU_SUSPEND if PM
548 select AUTO_ZRELADDR
a1c0a6ad 549 select COMMON_CLK
6d803ba7 550 select CLKDEV_LOOKUP
389d9b58 551 select CLKSRC_PXA
234b6ced 552 select CLKSRC_MMIO
6f6caeaa 553 select CLKSRC_OF
2f202861 554 select CPU_XSCALE if !CPU_XSC3
981d0f39 555 select GENERIC_CLOCKEVENTS
157d2644 556 select GPIO_PXA
d0ee9f40 557 select HAVE_IDE
d6cf30ca 558 select IRQ_DOMAIN
b1b3f49c 559 select MULTI_IRQ_HANDLER
b1b3f49c
RK
560 select PLAT_PXA
561 select SPARSE_IRQ
f999b8bd 562 help
2c8086a5 563 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
1da177e4
LT
564
565config ARCH_RPC
566 bool "RiscPC"
868e87cc 567 depends on MMU
1da177e4 568 select ARCH_ACORN
a08b6b79 569 select ARCH_MAY_HAVE_PC_FDC
07f841b7 570 select ARCH_SPARSEMEM_ENABLE
5cfc8ee0 571 select ARCH_USES_GETTIMEOFFSET
fa04e209 572 select CPU_SA110
b1b3f49c 573 select FIQ
d0ee9f40 574 select HAVE_IDE
b1b3f49c
RK
575 select HAVE_PATA_PLATFORM
576 select ISA_DMA_API
c334bc15 577 select NEED_MACH_IO_H
0cdc8b92 578 select NEED_MACH_MEMORY_H
ce816fa8 579 select NO_IOPORT_MAP
1da177e4
LT
580 help
581 On the Acorn Risc-PC, Linux can support the internal IDE disk and
582 CD-ROM interface, serial and parallel port, and the floppy drive.
583
584config ARCH_SA1100
585 bool "SA1100-based"
b1b3f49c
RK
586 select ARCH_MTD_XIP
587 select ARCH_REQUIRE_GPIOLIB
588 select ARCH_SPARSEMEM_ENABLE
589 select CLKDEV_LOOKUP
590 select CLKSRC_MMIO
389d9b58
DL
591 select CLKSRC_PXA
592 select CLKSRC_OF if OF
1937f5b9 593 select CPU_FREQ
b1b3f49c 594 select CPU_SA1100
3e238be2 595 select GENERIC_CLOCKEVENTS
d0ee9f40 596 select HAVE_IDE
1eca42b4 597 select IRQ_DOMAIN
b1b3f49c 598 select ISA
affcab32 599 select MULTI_IRQ_HANDLER
0cdc8b92 600 select NEED_MACH_MEMORY_H
375dec92 601 select SPARSE_IRQ
f999b8bd
MM
602 help
603 Support for StrongARM 11x0 based boards.
1da177e4 604
b130d5c2
KK
605config ARCH_S3C24XX
606 bool "Samsung S3C24XX SoCs"
53650430 607 select ARCH_REQUIRE_GPIOLIB
335cce74 608 select ATAGS
b1b3f49c 609 select CLKDEV_LOOKUP
4280506a 610 select CLKSRC_SAMSUNG_PWM
7f78b6eb 611 select GENERIC_CLOCKEVENTS
880cf071 612 select GPIO_SAMSUNG
20676c15 613 select HAVE_S3C2410_I2C if I2C
b130d5c2 614 select HAVE_S3C2410_WATCHDOG if WATCHDOG
b1b3f49c 615 select HAVE_S3C_RTC if RTC_CLASS
17453dd2 616 select MULTI_IRQ_HANDLER
c334bc15 617 select NEED_MACH_IO_H
cd8dc7ae 618 select SAMSUNG_ATAGS
1da177e4 619 help
b130d5c2
KK
620 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
621 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
622 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
623 Samsung SMDK2410 development board (and derivatives).
63b1f51b 624
7c6337e2
KH
625config ARCH_DAVINCI
626 bool "TI DaVinci"
b1b3f49c 627 select ARCH_HAS_HOLES_MEMORYMODEL
dce1115b 628 select ARCH_REQUIRE_GPIOLIB
6d803ba7 629 select CLKDEV_LOOKUP
ce32c5c5 630 select CPU_ARM926T
20e9969b 631 select GENERIC_ALLOCATOR
b1b3f49c 632 select GENERIC_CLOCKEVENTS
dc7ad3b3 633 select GENERIC_IRQ_CHIP
b1b3f49c 634 select HAVE_IDE
689e331f 635 select USE_OF
b1b3f49c 636 select ZONE_DMA
7c6337e2
KH
637 help
638 Support for TI's DaVinci platform.
639
a0694861
TL
640config ARCH_OMAP1
641 bool "TI OMAP1"
00a36698 642 depends on MMU
9af915da 643 select ARCH_HAS_HOLES_MEMORYMODEL
a0694861 644 select ARCH_OMAP
21f47fbc 645 select ARCH_REQUIRE_GPIOLIB
b1b3f49c 646 select CLKDEV_LOOKUP
d6e15d78 647 select CLKSRC_MMIO
b1b3f49c 648 select GENERIC_CLOCKEVENTS
a0694861 649 select GENERIC_IRQ_CHIP
a0694861
TL
650 select HAVE_IDE
651 select IRQ_DOMAIN
b694331c 652 select MULTI_IRQ_HANDLER
a0694861
TL
653 select NEED_MACH_IO_H if PCCARD
654 select NEED_MACH_MEMORY_H
685e2d08 655 select SPARSE_IRQ
21f47fbc 656 help
a0694861 657 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
02c981c0 658
1da177e4
LT
659endchoice
660
387798b3
RH
661menu "Multiple platform selection"
662 depends on ARCH_MULTIPLATFORM
663
664comment "CPU Core family selection"
665
f8afae40
AB
666config ARCH_MULTI_V4
667 bool "ARMv4 based platforms (FA526)"
668 depends on !ARCH_MULTI_V6_V7
669 select ARCH_MULTI_V4_V5
670 select CPU_FA526
671
387798b3
RH
672config ARCH_MULTI_V4T
673 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
387798b3 674 depends on !ARCH_MULTI_V6_V7
b1b3f49c 675 select ARCH_MULTI_V4_V5
24e860fb
AB
676 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
677 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
678 CPU_ARM925T || CPU_ARM940T)
387798b3
RH
679
680config ARCH_MULTI_V5
681 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
387798b3 682 depends on !ARCH_MULTI_V6_V7
b1b3f49c 683 select ARCH_MULTI_V4_V5
12567bbd 684 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
24e860fb
AB
685 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
686 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
387798b3
RH
687
688config ARCH_MULTI_V4_V5
689 bool
690
691config ARCH_MULTI_V6
8dda05cc 692 bool "ARMv6 based platforms (ARM11)"
387798b3 693 select ARCH_MULTI_V6_V7
42f4754a 694 select CPU_V6K
387798b3
RH
695
696config ARCH_MULTI_V7
8dda05cc 697 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
387798b3
RH
698 default y
699 select ARCH_MULTI_V6_V7
b1b3f49c 700 select CPU_V7
90bc8ac7 701 select HAVE_SMP
387798b3
RH
702
703config ARCH_MULTI_V6_V7
704 bool
9352b05b 705 select MIGHT_HAVE_CACHE_L2X0
387798b3
RH
706
707config ARCH_MULTI_CPU_AUTO
708 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
709 select ARCH_MULTI_V5
710
711endmenu
712
05e2a3de 713config ARCH_VIRT
e3246542
MY
714 bool "Dummy Virtual Machine"
715 depends on ARCH_MULTI_V7
4b8b5f25 716 select ARM_AMBA
05e2a3de 717 select ARM_GIC
0e2f91e9 718 select ARM_GIC_V2M if PCI_MSI
0b28f1db 719 select ARM_GIC_V3
05e2a3de 720 select ARM_PSCI
4b8b5f25 721 select HAVE_ARM_ARCH_TIMER
05e2a3de 722
ccf50e23
RK
723#
724# This is sorted alphabetically by mach-* pathname. However, plat-*
725# Kconfigs may be included either alphabetically (according to the
726# plat- suffix) or along side the corresponding mach-* source.
727#
3e93a22b
GC
728source "arch/arm/mach-mvebu/Kconfig"
729
445d9b30
TZ
730source "arch/arm/mach-alpine/Kconfig"
731
590b460c
LP
732source "arch/arm/mach-artpec/Kconfig"
733
d9bfc86d
OR
734source "arch/arm/mach-asm9260/Kconfig"
735
95b8f20f
RK
736source "arch/arm/mach-at91/Kconfig"
737
1d22924e
AB
738source "arch/arm/mach-axxia/Kconfig"
739
8ac49e04
CD
740source "arch/arm/mach-bcm/Kconfig"
741
1c37fa10
SH
742source "arch/arm/mach-berlin/Kconfig"
743
1da177e4
LT
744source "arch/arm/mach-clps711x/Kconfig"
745
d94f944e
AV
746source "arch/arm/mach-cns3xxx/Kconfig"
747
95b8f20f
RK
748source "arch/arm/mach-davinci/Kconfig"
749
df8d742e
BS
750source "arch/arm/mach-digicolor/Kconfig"
751
95b8f20f
RK
752source "arch/arm/mach-dove/Kconfig"
753
e7736d47
LB
754source "arch/arm/mach-ep93xx/Kconfig"
755
1da177e4
LT
756source "arch/arm/mach-footbridge/Kconfig"
757
59d3a193
PZ
758source "arch/arm/mach-gemini/Kconfig"
759
387798b3
RH
760source "arch/arm/mach-highbank/Kconfig"
761
389ee0c2
HZ
762source "arch/arm/mach-hisi/Kconfig"
763
1da177e4
LT
764source "arch/arm/mach-integrator/Kconfig"
765
3f7e5815
LB
766source "arch/arm/mach-iop32x/Kconfig"
767
768source "arch/arm/mach-iop33x/Kconfig"
1da177e4 769
285f5fa7
DW
770source "arch/arm/mach-iop13xx/Kconfig"
771
1da177e4
LT
772source "arch/arm/mach-ixp4xx/Kconfig"
773
828989ad
SS
774source "arch/arm/mach-keystone/Kconfig"
775
95b8f20f
RK
776source "arch/arm/mach-ks8695/Kconfig"
777
3b8f5030
CC
778source "arch/arm/mach-meson/Kconfig"
779
17723fd3
JJ
780source "arch/arm/mach-moxart/Kconfig"
781
8c2ed9bc
JS
782source "arch/arm/mach-aspeed/Kconfig"
783
794d15b2
SS
784source "arch/arm/mach-mv78xx0/Kconfig"
785
3995eb82 786source "arch/arm/mach-imx/Kconfig"
1da177e4 787
f682a218
MB
788source "arch/arm/mach-mediatek/Kconfig"
789
1d3f33d5
SG
790source "arch/arm/mach-mxs/Kconfig"
791
95b8f20f 792source "arch/arm/mach-netx/Kconfig"
49cbe786 793
95b8f20f 794source "arch/arm/mach-nomadik/Kconfig"
95b8f20f 795
9851ca57
DT
796source "arch/arm/mach-nspire/Kconfig"
797
d48af15e
TL
798source "arch/arm/plat-omap/Kconfig"
799
800source "arch/arm/mach-omap1/Kconfig"
1da177e4 801
1dbae815
TL
802source "arch/arm/mach-omap2/Kconfig"
803
9dd0b194 804source "arch/arm/mach-orion5x/Kconfig"
585cf175 805
387798b3
RH
806source "arch/arm/mach-picoxcell/Kconfig"
807
95b8f20f
RK
808source "arch/arm/mach-pxa/Kconfig"
809source "arch/arm/plat-pxa/Kconfig"
585cf175 810
95b8f20f
RK
811source "arch/arm/mach-mmp/Kconfig"
812
8c9184b7
NA
813source "arch/arm/mach-oxnas/Kconfig"
814
8fc1b0f8
KG
815source "arch/arm/mach-qcom/Kconfig"
816
95b8f20f
RK
817source "arch/arm/mach-realview/Kconfig"
818
d63dc051
HS
819source "arch/arm/mach-rockchip/Kconfig"
820
95b8f20f 821source "arch/arm/mach-sa1100/Kconfig"
edabd38e 822
387798b3
RH
823source "arch/arm/mach-socfpga/Kconfig"
824
a7ed099f 825source "arch/arm/mach-spear/Kconfig"
a21765a7 826
65ebcc11
SK
827source "arch/arm/mach-sti/Kconfig"
828
85fd6d63 829source "arch/arm/mach-s3c24xx/Kconfig"
1da177e4 830
431107ea 831source "arch/arm/mach-s3c64xx/Kconfig"
a08ab637 832
170f4e42
KK
833source "arch/arm/mach-s5pv210/Kconfig"
834
83014579 835source "arch/arm/mach-exynos/Kconfig"
e509b289 836source "arch/arm/plat-samsung/Kconfig"
cc0e72b8 837
882d01f9 838source "arch/arm/mach-shmobile/Kconfig"
52c543f9 839
3b52634f
MR
840source "arch/arm/mach-sunxi/Kconfig"
841
156a0997
BS
842source "arch/arm/mach-prima2/Kconfig"
843
d6de5b02
MG
844source "arch/arm/mach-tango/Kconfig"
845
c5f80065
EG
846source "arch/arm/mach-tegra/Kconfig"
847
95b8f20f 848source "arch/arm/mach-u300/Kconfig"
1da177e4 849
ba56a987
MY
850source "arch/arm/mach-uniphier/Kconfig"
851
95b8f20f 852source "arch/arm/mach-ux500/Kconfig"
1da177e4
LT
853
854source "arch/arm/mach-versatile/Kconfig"
855
ceade897 856source "arch/arm/mach-vexpress/Kconfig"
420c34e4 857source "arch/arm/plat-versatile/Kconfig"
ceade897 858
6f35f9a9
TP
859source "arch/arm/mach-vt8500/Kconfig"
860
7ec80ddf 861source "arch/arm/mach-w90x900/Kconfig"
862
acede515
JN
863source "arch/arm/mach-zx/Kconfig"
864
9a45eb69
JC
865source "arch/arm/mach-zynq/Kconfig"
866
499f1640
SA
867# ARMv7-M architecture
868config ARCH_EFM32
869 bool "Energy Micro efm32"
870 depends on ARM_SINGLE_ARMV7M
871 select ARCH_REQUIRE_GPIOLIB
872 help
873 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
874 processors.
875
876config ARCH_LPC18XX
877 bool "NXP LPC18xx/LPC43xx"
878 depends on ARM_SINGLE_ARMV7M
879 select ARCH_HAS_RESET_CONTROLLER
880 select ARM_AMBA
881 select CLKSRC_LPC32XX
882 select PINCTRL
883 help
884 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
885 high performance microcontrollers.
886
887config ARCH_STM32
888 bool "STMicrolectronics STM32"
889 depends on ARM_SINGLE_ARMV7M
890 select ARCH_HAS_RESET_CONTROLLER
891 select ARMV7M_SYSTICK
25263186 892 select CLKSRC_STM32
f64e9804 893 select PINCTRL
499f1640
SA
894 select RESET_CONTROLLER
895 help
896 Support for STMicroelectronics STM32 processors.
897
fa65fc6b
MC
898config MACH_STM32F429
899 bool "STMicrolectronics STM32F429"
900 depends on ARCH_STM32
901 default y
902
1847119d
VM
903config ARCH_MPS2
904 bool "ARM MPS2 paltform"
905 depends on ARM_SINGLE_ARMV7M
906 select ARM_AMBA
907 select CLKSRC_MPS2
908 help
909 Support for Cortex-M Prototyping System (or V2M-MPS2) which comes
910 with a range of available cores like Cortex-M3/M4/M7.
911
912 Please, note that depends which Application Note is used memory map
913 for the platform may vary, so adjustment of RAM base might be needed.
914
1da177e4
LT
915# Definitions to make life easier
916config ARCH_ACORN
917 bool
918
7ae1f7ec
LB
919config PLAT_IOP
920 bool
469d3044 921 select GENERIC_CLOCKEVENTS
7ae1f7ec 922
69b02f6a
LB
923config PLAT_ORION
924 bool
bfe45e0b 925 select CLKSRC_MMIO
b1b3f49c 926 select COMMON_CLK
dc7ad3b3 927 select GENERIC_IRQ_CHIP
278b45b0 928 select IRQ_DOMAIN
69b02f6a 929
abcda1dc
TP
930config PLAT_ORION_LEGACY
931 bool
932 select PLAT_ORION
933
bd5ce433
EM
934config PLAT_PXA
935 bool
936
f4b8b319
RK
937config PLAT_VERSATILE
938 bool
939
d9a1beaa
AC
940source "arch/arm/firmware/Kconfig"
941
1da177e4
LT
942source arch/arm/mm/Kconfig
943
afe4b25e 944config IWMMXT
d93003e8
SH
945 bool "Enable iWMMXt support"
946 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
947 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
afe4b25e
LB
948 help
949 Enable support for iWMMXt context switching at run time if
950 running on a CPU that supports it.
951
52108641 952config MULTI_IRQ_HANDLER
953 bool
954 help
955 Allow each machine to specify it's own IRQ handler at run time.
956
3b93e7b0
HC
957if !MMU
958source "arch/arm/Kconfig-nommu"
959endif
960
3e0a07f8
GC
961config PJ4B_ERRATA_4742
962 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
963 depends on CPU_PJ4B && MACH_ARMADA_370
964 default y
965 help
966 When coming out of either a Wait for Interrupt (WFI) or a Wait for
967 Event (WFE) IDLE states, a specific timing sensitivity exists between
968 the retiring WFI/WFE instructions and the newly issued subsequent
969 instructions. This sensitivity can result in a CPU hang scenario.
970 Workaround:
971 The software must insert either a Data Synchronization Barrier (DSB)
972 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
973 instruction
974
f0c4b8d6
WD
975config ARM_ERRATA_326103
976 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
977 depends on CPU_V6
978 help
979 Executing a SWP instruction to read-only memory does not set bit 11
980 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
981 treat the access as a read, preventing a COW from occurring and
982 causing the faulting task to livelock.
983
9cba3ccc
CM
984config ARM_ERRATA_411920
985 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
e399b1a4 986 depends on CPU_V6 || CPU_V6K
9cba3ccc
CM
987 help
988 Invalidation of the Instruction Cache operation can
989 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
990 It does not affect the MPCore. This option enables the ARM Ltd.
991 recommended workaround.
992
7ce236fc
CM
993config ARM_ERRATA_430973
994 bool "ARM errata: Stale prediction on replaced interworking branch"
995 depends on CPU_V7
996 help
997 This option enables the workaround for the 430973 Cortex-A8
79403cda 998 r1p* erratum. If a code sequence containing an ARM/Thumb
7ce236fc
CM
999 interworking branch is replaced with another code sequence at the
1000 same virtual address, whether due to self-modifying code or virtual
1001 to physical address re-mapping, Cortex-A8 does not recover from the
1002 stale interworking branch prediction. This results in Cortex-A8
1003 executing the new code sequence in the incorrect ARM or Thumb state.
1004 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1005 and also flushes the branch target cache at every context switch.
1006 Note that setting specific bits in the ACTLR register may not be
1007 available in non-secure mode.
1008
855c551f
CM
1009config ARM_ERRATA_458693
1010 bool "ARM errata: Processor deadlock when a false hazard is created"
1011 depends on CPU_V7
62e4d357 1012 depends on !ARCH_MULTIPLATFORM
855c551f
CM
1013 help
1014 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1015 erratum. For very specific sequences of memory operations, it is
1016 possible for a hazard condition intended for a cache line to instead
1017 be incorrectly associated with a different cache line. This false
1018 hazard might then cause a processor deadlock. The workaround enables
1019 the L1 caching of the NEON accesses and disables the PLD instruction
1020 in the ACTLR register. Note that setting specific bits in the ACTLR
1021 register may not be available in non-secure mode.
1022
0516e464
CM
1023config ARM_ERRATA_460075
1024 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1025 depends on CPU_V7
62e4d357 1026 depends on !ARCH_MULTIPLATFORM
0516e464
CM
1027 help
1028 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1029 erratum. Any asynchronous access to the L2 cache may encounter a
1030 situation in which recent store transactions to the L2 cache are lost
1031 and overwritten with stale memory contents from external memory. The
1032 workaround disables the write-allocate mode for the L2 cache via the
1033 ACTLR register. Note that setting specific bits in the ACTLR register
1034 may not be available in non-secure mode.
1035
9f05027c
WD
1036config ARM_ERRATA_742230
1037 bool "ARM errata: DMB operation may be faulty"
1038 depends on CPU_V7 && SMP
62e4d357 1039 depends on !ARCH_MULTIPLATFORM
9f05027c
WD
1040 help
1041 This option enables the workaround for the 742230 Cortex-A9
1042 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1043 between two write operations may not ensure the correct visibility
1044 ordering of the two writes. This workaround sets a specific bit in
1045 the diagnostic register of the Cortex-A9 which causes the DMB
1046 instruction to behave as a DSB, ensuring the correct behaviour of
1047 the two writes.
1048
a672e99b
WD
1049config ARM_ERRATA_742231
1050 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1051 depends on CPU_V7 && SMP
62e4d357 1052 depends on !ARCH_MULTIPLATFORM
a672e99b
WD
1053 help
1054 This option enables the workaround for the 742231 Cortex-A9
1055 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1056 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1057 accessing some data located in the same cache line, may get corrupted
1058 data due to bad handling of the address hazard when the line gets
1059 replaced from one of the CPUs at the same time as another CPU is
1060 accessing it. This workaround sets specific bits in the diagnostic
1061 register of the Cortex-A9 which reduces the linefill issuing
1062 capabilities of the processor.
1063
69155794
JM
1064config ARM_ERRATA_643719
1065 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1066 depends on CPU_V7 && SMP
e5a5de44 1067 default y
69155794
JM
1068 help
1069 This option enables the workaround for the 643719 Cortex-A9 (prior to
1070 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1071 register returns zero when it should return one. The workaround
1072 corrects this value, ensuring cache maintenance operations which use
1073 it behave as intended and avoiding data corruption.
1074
cdf357f1
WD
1075config ARM_ERRATA_720789
1076 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
e66dc745 1077 depends on CPU_V7
cdf357f1
WD
1078 help
1079 This option enables the workaround for the 720789 Cortex-A9 (prior to
1080 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1081 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1082 As a consequence of this erratum, some TLB entries which should be
1083 invalidated are not, resulting in an incoherency in the system page
1084 tables. The workaround changes the TLB flushing routines to invalidate
1085 entries regardless of the ASID.
475d92fc
WD
1086
1087config ARM_ERRATA_743622
1088 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1089 depends on CPU_V7
62e4d357 1090 depends on !ARCH_MULTIPLATFORM
475d92fc
WD
1091 help
1092 This option enables the workaround for the 743622 Cortex-A9
efbc74ac 1093 (r2p*) erratum. Under very rare conditions, a faulty
475d92fc
WD
1094 optimisation in the Cortex-A9 Store Buffer may lead to data
1095 corruption. This workaround sets a specific bit in the diagnostic
1096 register of the Cortex-A9 which disables the Store Buffer
1097 optimisation, preventing the defect from occurring. This has no
1098 visible impact on the overall performance or power consumption of the
1099 processor.
1100
9a27c27c
WD
1101config ARM_ERRATA_751472
1102 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
ba90c516 1103 depends on CPU_V7
62e4d357 1104 depends on !ARCH_MULTIPLATFORM
9a27c27c
WD
1105 help
1106 This option enables the workaround for the 751472 Cortex-A9 (prior
1107 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1108 completion of a following broadcasted operation if the second
1109 operation is received by a CPU before the ICIALLUIS has completed,
1110 potentially leading to corrupted entries in the cache or TLB.
1111
fcbdc5fe
WD
1112config ARM_ERRATA_754322
1113 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1114 depends on CPU_V7
1115 help
1116 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1117 r3p*) erratum. A speculative memory access may cause a page table walk
1118 which starts prior to an ASID switch but completes afterwards. This
1119 can populate the micro-TLB with a stale entry which may be hit with
1120 the new ASID. This workaround places two dsb instructions in the mm
1121 switching code so that no page table walks can cross the ASID switch.
1122
5dab26af
WD
1123config ARM_ERRATA_754327
1124 bool "ARM errata: no automatic Store Buffer drain"
1125 depends on CPU_V7 && SMP
1126 help
1127 This option enables the workaround for the 754327 Cortex-A9 (prior to
1128 r2p0) erratum. The Store Buffer does not have any automatic draining
1129 mechanism and therefore a livelock may occur if an external agent
1130 continuously polls a memory location waiting to observe an update.
1131 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1132 written polling loops from denying visibility of updates to memory.
1133
145e10e1
CM
1134config ARM_ERRATA_364296
1135 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
fd832478 1136 depends on CPU_V6
145e10e1
CM
1137 help
1138 This options enables the workaround for the 364296 ARM1136
1139 r0p2 erratum (possible cache data corruption with
1140 hit-under-miss enabled). It sets the undocumented bit 31 in
1141 the auxiliary control register and the FI bit in the control
1142 register, thus disabling hit-under-miss without putting the
1143 processor into full low interrupt latency mode. ARM11MPCore
1144 is not affected.
1145
f630c1bd
WD
1146config ARM_ERRATA_764369
1147 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1148 depends on CPU_V7 && SMP
1149 help
1150 This option enables the workaround for erratum 764369
1151 affecting Cortex-A9 MPCore with two or more processors (all
1152 current revisions). Under certain timing circumstances, a data
1153 cache line maintenance operation by MVA targeting an Inner
1154 Shareable memory region may fail to proceed up to either the
1155 Point of Coherency or to the Point of Unification of the
1156 system. This workaround adds a DSB instruction before the
1157 relevant cache maintenance functions and sets a specific bit
1158 in the diagnostic control register of the SCU.
1159
7253b85c
SH
1160config ARM_ERRATA_775420
1161 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1162 depends on CPU_V7
1163 help
1164 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1165 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1166 operation aborts with MMU exception, it might cause the processor
1167 to deadlock. This workaround puts DSB before executing ISB if
1168 an abort may occur on cache maintenance.
1169
93dc6887
CM
1170config ARM_ERRATA_798181
1171 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1172 depends on CPU_V7 && SMP
1173 help
1174 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1175 adequately shooting down all use of the old entries. This
1176 option enables the Linux kernel workaround for this erratum
1177 which sends an IPI to the CPUs that are running the same ASID
1178 as the one being invalidated.
1179
84b6504f
WD
1180config ARM_ERRATA_773022
1181 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1182 depends on CPU_V7
1183 help
1184 This option enables the workaround for the 773022 Cortex-A15
1185 (up to r0p4) erratum. In certain rare sequences of code, the
1186 loop buffer may deliver incorrect instructions. This
1187 workaround disables the loop buffer to avoid the erratum.
1188
1da177e4
LT
1189endmenu
1190
1191source "arch/arm/common/Kconfig"
1192
1da177e4
LT
1193menu "Bus support"
1194
1da177e4
LT
1195config ISA
1196 bool
1da177e4
LT
1197 help
1198 Find out whether you have ISA slots on your motherboard. ISA is the
1199 name of a bus system, i.e. the way the CPU talks to the other stuff
1200 inside your box. Other bus systems are PCI, EISA, MicroChannel
1201 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1202 newer boards don't support it. If you have ISA, say Y, otherwise N.
1203
065909b9 1204# Select ISA DMA controller support
1da177e4
LT
1205config ISA_DMA
1206 bool
065909b9 1207 select ISA_DMA_API
1da177e4 1208
065909b9 1209# Select ISA DMA interface
5cae841b
AV
1210config ISA_DMA_API
1211 bool
5cae841b 1212
1da177e4 1213config PCI
0b05da72 1214 bool "PCI support" if MIGHT_HAVE_PCI
1da177e4
LT
1215 help
1216 Find out whether you have a PCI motherboard. PCI is the name of a
1217 bus system, i.e. the way the CPU talks to the other stuff inside
1218 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1219 VESA. If you have PCI, say Y, otherwise N.
1220
52882173
AV
1221config PCI_DOMAINS
1222 bool
1223 depends on PCI
1224
8c7d1474
LP
1225config PCI_DOMAINS_GENERIC
1226 def_bool PCI_DOMAINS
1227
b080ac8a
MRJ
1228config PCI_NANOENGINE
1229 bool "BSE nanoEngine PCI support"
1230 depends on SA1100_NANOENGINE
1231 help
1232 Enable PCI on the BSE nanoEngine board.
1233
36e23590
MW
1234config PCI_SYSCALL
1235 def_bool PCI
1236
a0113a99
MR
1237config PCI_HOST_ITE8152
1238 bool
1239 depends on PCI && MACH_ARMCORE
1240 default y
1241 select DMABOUNCE
1242
1da177e4
LT
1243source "drivers/pci/Kconfig"
1244
1245source "drivers/pcmcia/Kconfig"
1246
1247endmenu
1248
1249menu "Kernel Features"
1250
3b55658a
DM
1251config HAVE_SMP
1252 bool
1253 help
1254 This option should be selected by machines which have an SMP-
1255 capable CPU.
1256
1257 The only effect of this option is to make the SMP-related
1258 options available to the user for configuration.
1259
1da177e4 1260config SMP
bb2d8130 1261 bool "Symmetric Multi-Processing"
fbb4ddac 1262 depends on CPU_V6K || CPU_V7
bc28248e 1263 depends on GENERIC_CLOCKEVENTS
3b55658a 1264 depends on HAVE_SMP
801bb21c 1265 depends on MMU || ARM_MPU
0361748f 1266 select IRQ_WORK
1da177e4
LT
1267 help
1268 This enables support for systems with more than one CPU. If you have
4a474157
RG
1269 a system with only one CPU, say N. If you have a system with more
1270 than one CPU, say Y.
1da177e4 1271
4a474157 1272 If you say N here, the kernel will run on uni- and multiprocessor
1da177e4 1273 machines, but will use only one CPU of a multiprocessor machine. If
4a474157
RG
1274 you say Y here, the kernel will run on many, but not all,
1275 uniprocessor machines. On a uniprocessor machine, the kernel
1276 will run faster if you say N here.
1da177e4 1277
395cf969 1278 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1da177e4 1279 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
50a23e6e 1280 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1da177e4
LT
1281
1282 If you don't know what to do here, say N.
1283
f00ec48f 1284config SMP_ON_UP
5744ff43 1285 bool "Allow booting SMP kernel on uniprocessor systems"
801bb21c 1286 depends on SMP && !XIP_KERNEL && MMU
f00ec48f
RK
1287 default y
1288 help
1289 SMP kernels contain instructions which fail on non-SMP processors.
1290 Enabling this option allows the kernel to modify itself to make
1291 these instructions safe. Disabling it allows about 1K of space
1292 savings.
1293
1294 If you don't know what to do here, say Y.
1295
c9018aab
VG
1296config ARM_CPU_TOPOLOGY
1297 bool "Support cpu topology definition"
1298 depends on SMP && CPU_V7
1299 default y
1300 help
1301 Support ARM cpu topology definition. The MPIDR register defines
1302 affinity between processors which is then used to describe the cpu
1303 topology of an ARM System.
1304
1305config SCHED_MC
1306 bool "Multi-core scheduler support"
1307 depends on ARM_CPU_TOPOLOGY
1308 help
1309 Multi-core scheduler support improves the CPU scheduler's decision
1310 making when dealing with multi-core CPU chips at a cost of slightly
1311 increased overhead in some places. If unsure say N here.
1312
1313config SCHED_SMT
1314 bool "SMT scheduler support"
1315 depends on ARM_CPU_TOPOLOGY
1316 help
1317 Improves the CPU scheduler's decision making when dealing with
1318 MultiThreading at a cost of slightly increased overhead in some
1319 places. If unsure say N here.
1320
a8cbcd92
RK
1321config HAVE_ARM_SCU
1322 bool
a8cbcd92
RK
1323 help
1324 This option enables support for the ARM system coherency unit
1325
8a4da6e3 1326config HAVE_ARM_ARCH_TIMER
022c03a2
MZ
1327 bool "Architected timer support"
1328 depends on CPU_V7
8a4da6e3 1329 select ARM_ARCH_TIMER
0c403462 1330 select GENERIC_CLOCKEVENTS
022c03a2
MZ
1331 help
1332 This option enables support for the ARM architected timer
1333
f32f4ce2
RK
1334config HAVE_ARM_TWD
1335 bool
da4a686a 1336 select CLKSRC_OF if OF
f32f4ce2
RK
1337 help
1338 This options enables support for the ARM timer and watchdog unit
1339
e8db288e
NP
1340config MCPM
1341 bool "Multi-Cluster Power Management"
1342 depends on CPU_V7 && SMP
1343 help
1344 This option provides the common power management infrastructure
1345 for (multi-)cluster based systems, such as big.LITTLE based
1346 systems.
1347
ebf4a5c5
HZ
1348config MCPM_QUAD_CLUSTER
1349 bool
1350 depends on MCPM
1351 help
1352 To avoid wasting resources unnecessarily, MCPM only supports up
1353 to 2 clusters by default.
1354 Platforms with 3 or 4 clusters that use MCPM must select this
1355 option to allow the additional clusters to be managed.
1356
1c33be57
NP
1357config BIG_LITTLE
1358 bool "big.LITTLE support (Experimental)"
1359 depends on CPU_V7 && SMP
1360 select MCPM
1361 help
1362 This option enables support selections for the big.LITTLE
1363 system architecture.
1364
1365config BL_SWITCHER
1366 bool "big.LITTLE switcher support"
6c044fec 1367 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU && ARM_GIC
51aaf81f 1368 select CPU_PM
1c33be57
NP
1369 help
1370 The big.LITTLE "switcher" provides the core functionality to
1371 transparently handle transition between a cluster of A15's
1372 and a cluster of A7's in a big.LITTLE system.
1373
b22537c6
NP
1374config BL_SWITCHER_DUMMY_IF
1375 tristate "Simple big.LITTLE switcher user interface"
1376 depends on BL_SWITCHER && DEBUG_KERNEL
1377 help
1378 This is a simple and dummy char dev interface to control
1379 the big.LITTLE switcher core code. It is meant for
1380 debugging purposes only.
1381
8d5796d2
LB
1382choice
1383 prompt "Memory split"
006fa259 1384 depends on MMU
8d5796d2
LB
1385 default VMSPLIT_3G
1386 help
1387 Select the desired split between kernel and user memory.
1388
1389 If you are not absolutely sure what you are doing, leave this
1390 option alone!
1391
1392 config VMSPLIT_3G
1393 bool "3G/1G user/kernel split"
63ce446c
NP
1394 config VMSPLIT_3G_OPT
1395 bool "3G/1G user/kernel split (for full 1G low memory)"
8d5796d2
LB
1396 config VMSPLIT_2G
1397 bool "2G/2G user/kernel split"
1398 config VMSPLIT_1G
1399 bool "1G/3G user/kernel split"
1400endchoice
1401
1402config PAGE_OFFSET
1403 hex
006fa259 1404 default PHYS_OFFSET if !MMU
8d5796d2
LB
1405 default 0x40000000 if VMSPLIT_1G
1406 default 0x80000000 if VMSPLIT_2G
63ce446c 1407 default 0xB0000000 if VMSPLIT_3G_OPT
8d5796d2
LB
1408 default 0xC0000000
1409
1da177e4
LT
1410config NR_CPUS
1411 int "Maximum number of CPUs (2-32)"
1412 range 2 32
1413 depends on SMP
1414 default "4"
1415
a054a811 1416config HOTPLUG_CPU
00b7dede 1417 bool "Support for hot-pluggable CPUs"
40b31360 1418 depends on SMP
a054a811
RK
1419 help
1420 Say Y here to experiment with turning CPUs off and on. CPUs
1421 can be controlled through /sys/devices/system/cpu.
1422
2bdd424f
WD
1423config ARM_PSCI
1424 bool "Support for the ARM Power State Coordination Interface (PSCI)"
e679660d 1425 depends on HAVE_ARM_SMCCC
be120397 1426 select ARM_PSCI_FW
2bdd424f
WD
1427 help
1428 Say Y here if you want Linux to communicate with system firmware
1429 implementing the PSCI specification for CPU-centric power
1430 management operations described in ARM document number ARM DEN
1431 0022A ("Power State Coordination Interface System Software on
1432 ARM processors").
1433
2a6ad871
MR
1434# The GPIO number here must be sorted by descending number. In case of
1435# a multiplatform kernel, we just want the highest value required by the
1436# selected platforms.
44986ab0
PDSN
1437config ARCH_NR_GPIO
1438 int
b35d2e56
GF
1439 default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1440 ARCH_ZYNQ
aa42587a
TF
1441 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1442 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
eb171a99 1443 default 416 if ARCH_SUNXI
06b851e5 1444 default 392 if ARCH_U8500
01bb914c 1445 default 352 if ARCH_VT8500
7b5da4c3 1446 default 288 if ARCH_ROCKCHIP
2a6ad871 1447 default 264 if MACH_H4700
44986ab0
PDSN
1448 default 0
1449 help
1450 Maximum number of GPIOs in the system.
1451
1452 If unsure, leave the default value.
1453
d45a398f 1454source kernel/Kconfig.preempt
1da177e4 1455
c9218b16 1456config HZ_FIXED
f8065813 1457 int
070b8b43 1458 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
a73ddc61 1459 ARCH_S5PV210 || ARCH_EXYNOS4
1164f672 1460 default 128 if SOC_AT91RM9200
47d84682 1461 default 0
c9218b16
RK
1462
1463choice
47d84682 1464 depends on HZ_FIXED = 0
c9218b16
RK
1465 prompt "Timer frequency"
1466
1467config HZ_100
1468 bool "100 Hz"
1469
1470config HZ_200
1471 bool "200 Hz"
1472
1473config HZ_250
1474 bool "250 Hz"
1475
1476config HZ_300
1477 bool "300 Hz"
1478
1479config HZ_500
1480 bool "500 Hz"
1481
1482config HZ_1000
1483 bool "1000 Hz"
1484
1485endchoice
1486
1487config HZ
1488 int
47d84682 1489 default HZ_FIXED if HZ_FIXED != 0
c9218b16
RK
1490 default 100 if HZ_100
1491 default 200 if HZ_200
1492 default 250 if HZ_250
1493 default 300 if HZ_300
1494 default 500 if HZ_500
1495 default 1000
1496
1497config SCHED_HRTICK
1498 def_bool HIGH_RES_TIMERS
f8065813 1499
16c79651 1500config THUMB2_KERNEL
bc7dea00 1501 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
4477ca45 1502 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
bc7dea00 1503 default y if CPU_THUMBONLY
16c79651
CM
1504 select AEABI
1505 select ARM_ASM_UNIFIED
89bace65 1506 select ARM_UNWIND
16c79651
CM
1507 help
1508 By enabling this option, the kernel will be compiled in
1509 Thumb-2 mode. A compiler/assembler that understand the unified
1510 ARM-Thumb syntax is needed.
1511
1512 If unsure, say N.
1513
6f685c5c
DM
1514config THUMB2_AVOID_R_ARM_THM_JUMP11
1515 bool "Work around buggy Thumb-2 short branch relocations in gas"
1516 depends on THUMB2_KERNEL && MODULES
1517 default y
1518 help
1519 Various binutils versions can resolve Thumb-2 branches to
1520 locally-defined, preemptible global symbols as short-range "b.n"
1521 branch instructions.
1522
1523 This is a problem, because there's no guarantee the final
1524 destination of the symbol, or any candidate locations for a
1525 trampoline, are within range of the branch. For this reason, the
1526 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1527 relocation in modules at all, and it makes little sense to add
1528 support.
1529
1530 The symptom is that the kernel fails with an "unsupported
1531 relocation" error when loading some modules.
1532
1533 Until fixed tools are available, passing
1534 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1535 code which hits this problem, at the cost of a bit of extra runtime
1536 stack usage in some cases.
1537
1538 The problem is described in more detail at:
1539 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1540
1541 Only Thumb-2 kernels are affected.
1542
1543 Unless you are sure your tools don't have this problem, say Y.
1544
0becb088
CM
1545config ARM_ASM_UNIFIED
1546 bool
1547
42f25bdd
NP
1548config ARM_PATCH_IDIV
1549 bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()"
1550 depends on CPU_32v7 && !XIP_KERNEL
1551 default y
1552 help
1553 The ARM compiler inserts calls to __aeabi_idiv() and
1554 __aeabi_uidiv() when it needs to perform division on signed
1555 and unsigned integers. Some v7 CPUs have support for the sdiv
1556 and udiv instructions that can be used to implement those
1557 functions.
1558
1559 Enabling this option allows the kernel to modify itself to
1560 replace the first two instructions of these library functions
1561 with the sdiv or udiv plus "bx lr" instructions when the CPU
1562 it is running on supports them. Typically this will be faster
1563 and less power intensive than running the original library
1564 code to do integer division.
1565
704bdda0
NP
1566config AEABI
1567 bool "Use the ARM EABI to compile the kernel"
1568 help
1569 This option allows for the kernel to be compiled using the latest
1570 ARM ABI (aka EABI). This is only useful if you are using a user
1571 space environment that is also compiled with EABI.
1572
1573 Since there are major incompatibilities between the legacy ABI and
1574 EABI, especially with regard to structure member alignment, this
1575 option also changes the kernel syscall calling convention to
1576 disambiguate both ABIs and allow for backward compatibility support
1577 (selected with CONFIG_OABI_COMPAT).
1578
1579 To use this you need GCC version 4.0.0 or later.
1580
6c90c872 1581config OABI_COMPAT
a73a3ff1 1582 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
d6f94fa0 1583 depends on AEABI && !THUMB2_KERNEL
6c90c872
NP
1584 help
1585 This option preserves the old syscall interface along with the
1586 new (ARM EABI) one. It also provides a compatibility layer to
1587 intercept syscalls that have structure arguments which layout
1588 in memory differs between the legacy ABI and the new ARM EABI
1589 (only for non "thumb" binaries). This option adds a tiny
1590 overhead to all syscalls and produces a slightly larger kernel.
91702175
KC
1591
1592 The seccomp filter system will not be available when this is
1593 selected, since there is no way yet to sensibly distinguish
1594 between calling conventions during filtering.
1595
6c90c872
NP
1596 If you know you'll be using only pure EABI user space then you
1597 can say N here. If this option is not selected and you attempt
1598 to execute a legacy ABI binary then the result will be
1599 UNPREDICTABLE (in fact it can be predicted that it won't work
b02f8467 1600 at all). If in doubt say N.
6c90c872 1601
eb33575c 1602config ARCH_HAS_HOLES_MEMORYMODEL
e80d6a24 1603 bool
e80d6a24 1604
05944d74
RK
1605config ARCH_SPARSEMEM_ENABLE
1606 bool
1607
07a2f737
RK
1608config ARCH_SPARSEMEM_DEFAULT
1609 def_bool ARCH_SPARSEMEM_ENABLE
1610
05944d74 1611config ARCH_SELECT_MEMORY_MODEL
be370302 1612 def_bool ARCH_SPARSEMEM_ENABLE
c80d79d7 1613
7b7bf499
WD
1614config HAVE_ARCH_PFN_VALID
1615 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1616
b8cd51af
SC
1617config HAVE_GENERIC_RCU_GUP
1618 def_bool y
1619 depends on ARM_LPAE
1620
053a96ca 1621config HIGHMEM
e8db89a2
RK
1622 bool "High Memory Support"
1623 depends on MMU
053a96ca
NP
1624 help
1625 The address space of ARM processors is only 4 Gigabytes large
1626 and it has to accommodate user address space, kernel address
1627 space as well as some memory mapped IO. That means that, if you
1628 have a large amount of physical memory and/or IO, not all of the
1629 memory can be "permanently mapped" by the kernel. The physical
1630 memory that is not permanently mapped is called "high memory".
1631
1632 Depending on the selected kernel/user memory split, minimum
1633 vmalloc space and actual amount of RAM, you may not need this
1634 option which should result in a slightly faster kernel.
1635
1636 If unsure, say n.
1637
65cec8e3 1638config HIGHPTE
9a431bd5 1639 bool "Allocate 2nd-level pagetables from highmem" if EXPERT
65cec8e3 1640 depends on HIGHMEM
9a431bd5 1641 default y
b4d103d1
RK
1642 help
1643 The VM uses one page of physical memory for each page table.
1644 For systems with a lot of processes, this can use a lot of
1645 precious low memory, eventually leading to low memory being
1646 consumed by page tables. Setting this option will allow
1647 user-space 2nd level page tables to reside in high memory.
65cec8e3 1648
a5e090ac
RK
1649config CPU_SW_DOMAIN_PAN
1650 bool "Enable use of CPU domains to implement privileged no-access"
1651 depends on MMU && !ARM_LPAE
1b8873a0
JI
1652 default y
1653 help
a5e090ac
RK
1654 Increase kernel security by ensuring that normal kernel accesses
1655 are unable to access userspace addresses. This can help prevent
1656 use-after-free bugs becoming an exploitable privilege escalation
1657 by ensuring that magic values (such as LIST_POISON) will always
1658 fault when dereferenced.
1659
1660 CPUs with low-vector mappings use a best-efforts implementation.
1661 Their lower 1MB needs to remain accessible for the vectors, but
1662 the remainder of userspace will become appropriately inaccessible.
65cec8e3 1663
1b8873a0 1664config HW_PERF_EVENTS
fa8ad788
MR
1665 def_bool y
1666 depends on ARM_PMU
1b8873a0 1667
1355e2a6
CM
1668config SYS_SUPPORTS_HUGETLBFS
1669 def_bool y
1670 depends on ARM_LPAE
1671
8d962507
CM
1672config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1673 def_bool y
1674 depends on ARM_LPAE
1675
4bfab203
SC
1676config ARCH_WANT_GENERAL_HUGETLB
1677 def_bool y
1678
7d485f64
AB
1679config ARM_MODULE_PLTS
1680 bool "Use PLTs to allow module memory to spill over into vmalloc area"
1681 depends on MODULES
1682 help
1683 Allocate PLTs when loading modules so that jumps and calls whose
1684 targets are too far away for their relative offsets to be encoded
1685 in the instructions themselves can be bounced via veneers in the
1686 module's PLT. This allows modules to be allocated in the generic
1687 vmalloc area after the dedicated module memory area has been
1688 exhausted. The modules will use slightly more memory, but after
1689 rounding up to page size, the actual memory footprint is usually
1690 the same.
1691
1692 Say y if you are getting out of memory errors while loading modules
1693
3f22ab27
DH
1694source "mm/Kconfig"
1695
c1b2d970 1696config FORCE_MAX_ZONEORDER
36d6c928 1697 int "Maximum zone order"
898f08e1 1698 default "12" if SOC_AM33XX
6d85e2b0 1699 default "9" if SA1111 || ARCH_EFM32
c1b2d970
MD
1700 default "11"
1701 help
1702 The kernel memory allocator divides physically contiguous memory
1703 blocks into "zones", where each zone is a power of two number of
1704 pages. This option selects the largest power of two that the kernel
1705 keeps in the memory allocator. If you need to allocate very large
1706 blocks of physically contiguous memory, then you may need to
1707 increase this value.
1708
1709 This config option is actually maximum order plus one. For example,
1710 a value of 11 means that the largest free memory block is 2^10 pages.
1711
1da177e4
LT
1712config ALIGNMENT_TRAP
1713 bool
f12d0d7c 1714 depends on CPU_CP15_MMU
1da177e4 1715 default y if !ARCH_EBSA110
e119bfff 1716 select HAVE_PROC_CPU if PROC_FS
1da177e4 1717 help
84eb8d06 1718 ARM processors cannot fetch/store information which is not
1da177e4
LT
1719 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1720 address divisible by 4. On 32-bit ARM processors, these non-aligned
1721 fetch/store instructions will be emulated in software if you say
1722 here, which has a severe performance impact. This is necessary for
1723 correct operation of some network protocols. With an IP-only
1724 configuration it is safe to say N, otherwise say Y.
1725
39ec58f3 1726config UACCESS_WITH_MEMCPY
38ef2ad5
LW
1727 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1728 depends on MMU
39ec58f3
LB
1729 default y if CPU_FEROCEON
1730 help
1731 Implement faster copy_to_user and clear_user methods for CPU
1732 cores where a 8-word STM instruction give significantly higher
1733 memory write throughput than a sequence of individual 32bit stores.
1734
1735 A possible side effect is a slight increase in scheduling latency
1736 between threads sharing the same address space if they invoke
1737 such copy operations with large buffers.
1738
1739 However, if the CPU data cache is using a write-allocate mode,
1740 this option is unlikely to provide any performance gain.
1741
70c70d97
NP
1742config SECCOMP
1743 bool
1744 prompt "Enable seccomp to safely compute untrusted bytecode"
1745 ---help---
1746 This kernel feature is useful for number crunching applications
1747 that may need to compute untrusted bytecode during their
1748 execution. By using pipes or other transports made available to
1749 the process as file descriptors supporting the read/write
1750 syscalls, it's possible to isolate those applications in
1751 their own address space using seccomp. Once seccomp is
1752 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1753 and the task is only allowed to execute a few safe syscalls
1754 defined by each seccomp mode.
1755
06e6295b
SS
1756config SWIOTLB
1757 def_bool y
1758
1759config IOMMU_HELPER
1760 def_bool SWIOTLB
1761
02c2433b
SS
1762config PARAVIRT
1763 bool "Enable paravirtualization code"
1764 help
1765 This changes the kernel so it can modify itself when it is run
1766 under a hypervisor, potentially improving performance significantly
1767 over full virtualization.
1768
1769config PARAVIRT_TIME_ACCOUNTING
1770 bool "Paravirtual steal time accounting"
1771 select PARAVIRT
1772 default n
1773 help
1774 Select this option to enable fine granularity task steal time
1775 accounting. Time spent executing other tasks in parallel with
1776 the current vCPU is discounted from the vCPU power. To account for
1777 that, there can be a small performance impact.
1778
1779 If in doubt, say N here.
1780
eff8d644
SS
1781config XEN_DOM0
1782 def_bool y
1783 depends on XEN
1784
1785config XEN
c2ba1f7d 1786 bool "Xen guest support on ARM"
85323a99 1787 depends on ARM && AEABI && OF
f880b67d 1788 depends on CPU_V7 && !CPU_V6
85323a99 1789 depends on !GENERIC_ATOMIC64
7693decc 1790 depends on MMU
51aaf81f 1791 select ARCH_DMA_ADDR_T_64BIT
17b7ab80 1792 select ARM_PSCI
83862ccf 1793 select SWIOTLB_XEN
02c2433b 1794 select PARAVIRT
eff8d644
SS
1795 help
1796 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1797
1da177e4
LT
1798endmenu
1799
1800menu "Boot options"
1801
9eb8f674
GL
1802config USE_OF
1803 bool "Flattened Device Tree support"
b1b3f49c 1804 select IRQ_DOMAIN
9eb8f674 1805 select OF
9eb8f674
GL
1806 help
1807 Include support for flattened device tree machine descriptions.
1808
bd51e2f5
NP
1809config ATAGS
1810 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1811 default y
1812 help
1813 This is the traditional way of passing data to the kernel at boot
1814 time. If you are solely relying on the flattened device tree (or
1815 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1816 to remove ATAGS support from your kernel binary. If unsure,
1817 leave this to y.
1818
1819config DEPRECATED_PARAM_STRUCT
1820 bool "Provide old way to pass kernel parameters"
1821 depends on ATAGS
1822 help
1823 This was deprecated in 2001 and announced to live on for 5 years.
1824 Some old boot loaders still use this way.
1825
1da177e4
LT
1826# Compressed boot loader in ROM. Yes, we really want to ask about
1827# TEXT and BSS so we preserve their values in the config files.
1828config ZBOOT_ROM_TEXT
1829 hex "Compressed ROM boot loader base address"
1830 default "0"
1831 help
1832 The physical address at which the ROM-able zImage is to be
1833 placed in the target. Platforms which normally make use of
1834 ROM-able zImage formats normally set this to a suitable
1835 value in their defconfig file.
1836
1837 If ZBOOT_ROM is not enabled, this has no effect.
1838
1839config ZBOOT_ROM_BSS
1840 hex "Compressed ROM boot loader BSS address"
1841 default "0"
1842 help
f8c440b2
DF
1843 The base address of an area of read/write memory in the target
1844 for the ROM-able zImage which must be available while the
1845 decompressor is running. It must be large enough to hold the
1846 entire decompressed kernel plus an additional 128 KiB.
1847 Platforms which normally make use of ROM-able zImage formats
1848 normally set this to a suitable value in their defconfig file.
1da177e4
LT
1849
1850 If ZBOOT_ROM is not enabled, this has no effect.
1851
1852config ZBOOT_ROM
1853 bool "Compressed boot loader in ROM/flash"
1854 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
10968131 1855 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1da177e4
LT
1856 help
1857 Say Y here if you intend to execute your compressed kernel image
1858 (zImage) directly from ROM or flash. If unsure, say N.
1859
e2a6a3aa
JB
1860config ARM_APPENDED_DTB
1861 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
10968131 1862 depends on OF
e2a6a3aa
JB
1863 help
1864 With this option, the boot code will look for a device tree binary
1865 (DTB) appended to zImage
1866 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1867
1868 This is meant as a backward compatibility convenience for those
1869 systems with a bootloader that can't be upgraded to accommodate
1870 the documented boot protocol using a device tree.
1871
1872 Beware that there is very little in terms of protection against
1873 this option being confused by leftover garbage in memory that might
1874 look like a DTB header after a reboot if no actual DTB is appended
1875 to zImage. Do not leave this option active in a production kernel
1876 if you don't intend to always append a DTB. Proper passing of the
1877 location into r2 of a bootloader provided DTB is always preferable
1878 to this option.
1879
b90b9a38
NP
1880config ARM_ATAG_DTB_COMPAT
1881 bool "Supplement the appended DTB with traditional ATAG information"
1882 depends on ARM_APPENDED_DTB
1883 help
1884 Some old bootloaders can't be updated to a DTB capable one, yet
1885 they provide ATAGs with memory configuration, the ramdisk address,
1886 the kernel cmdline string, etc. Such information is dynamically
1887 provided by the bootloader and can't always be stored in a static
1888 DTB. To allow a device tree enabled kernel to be used with such
1889 bootloaders, this option allows zImage to extract the information
1890 from the ATAG list and store it at run time into the appended DTB.
1891
d0f34a11
GR
1892choice
1893 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1894 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1895
1896config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1897 bool "Use bootloader kernel arguments if available"
1898 help
1899 Uses the command-line options passed by the boot loader instead of
1900 the device tree bootargs property. If the boot loader doesn't provide
1901 any, the device tree bootargs property will be used.
1902
1903config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1904 bool "Extend with bootloader kernel arguments"
1905 help
1906 The command-line arguments provided by the boot loader will be
1907 appended to the the device tree bootargs property.
1908
1909endchoice
1910
1da177e4
LT
1911config CMDLINE
1912 string "Default kernel command string"
1913 default ""
1914 help
1915 On some architectures (EBSA110 and CATS), there is currently no way
1916 for the boot loader to pass arguments to the kernel. For these
1917 architectures, you should supply some command-line options at build
1918 time by entering them here. As a minimum, you should specify the
1919 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1920
4394c124
VB
1921choice
1922 prompt "Kernel command line type" if CMDLINE != ""
1923 default CMDLINE_FROM_BOOTLOADER
bd51e2f5 1924 depends on ATAGS
4394c124
VB
1925
1926config CMDLINE_FROM_BOOTLOADER
1927 bool "Use bootloader kernel arguments if available"
1928 help
1929 Uses the command-line options passed by the boot loader. If
1930 the boot loader doesn't provide any, the default kernel command
1931 string provided in CMDLINE will be used.
1932
1933config CMDLINE_EXTEND
1934 bool "Extend bootloader kernel arguments"
1935 help
1936 The command-line arguments provided by the boot loader will be
1937 appended to the default kernel command string.
1938
92d2040d
AH
1939config CMDLINE_FORCE
1940 bool "Always use the default kernel command string"
92d2040d
AH
1941 help
1942 Always use the default kernel command string, even if the boot
1943 loader passes other arguments to the kernel.
1944 This is useful if you cannot or don't want to change the
1945 command-line options your boot loader passes to the kernel.
4394c124 1946endchoice
92d2040d 1947
1da177e4
LT
1948config XIP_KERNEL
1949 bool "Kernel Execute-In-Place from ROM"
10968131 1950 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1da177e4
LT
1951 help
1952 Execute-In-Place allows the kernel to run from non-volatile storage
1953 directly addressable by the CPU, such as NOR flash. This saves RAM
1954 space since the text section of the kernel is not loaded from flash
1955 to RAM. Read-write sections, such as the data section and stack,
1956 are still copied to RAM. The XIP kernel is not compressed since
1957 it has to run directly from flash, so it will take more space to
1958 store it. The flash address used to link the kernel object files,
1959 and for storing it, is configuration dependent. Therefore, if you
1960 say Y here, you must know the proper physical address where to
1961 store the kernel image depending on your own flash memory usage.
1962
1963 Also note that the make target becomes "make xipImage" rather than
1964 "make zImage" or "make Image". The final kernel binary to put in
1965 ROM memory will be arch/arm/boot/xipImage.
1966
1967 If unsure, say N.
1968
1969config XIP_PHYS_ADDR
1970 hex "XIP Kernel Physical Location"
1971 depends on XIP_KERNEL
1972 default "0x00080000"
1973 help
1974 This is the physical address in your flash memory the kernel will
1975 be linked for and stored to. This address is dependent on your
1976 own flash usage.
1977
c587e4a6
RP
1978config KEXEC
1979 bool "Kexec system call (EXPERIMENTAL)"
19ab428f 1980 depends on (!SMP || PM_SLEEP_SMP)
cb1293e2 1981 depends on !CPU_V7M
2965faa5 1982 select KEXEC_CORE
c587e4a6
RP
1983 help
1984 kexec is a system call that implements the ability to shutdown your
1985 current kernel, and to start another kernel. It is like a reboot
01dd2fbf 1986 but it is independent of the system firmware. And like a reboot
c587e4a6
RP
1987 you can start any kernel with it, not just Linux.
1988
1989 It is an ongoing process to be certain the hardware in a machine
1990 is properly shutdown, so do not be surprised if this code does not
bf220695 1991 initially work for you.
c587e4a6 1992
4cd9d6f7
RP
1993config ATAGS_PROC
1994 bool "Export atags in procfs"
bd51e2f5 1995 depends on ATAGS && KEXEC
b98d7291 1996 default y
4cd9d6f7
RP
1997 help
1998 Should the atags used to boot the kernel be exported in an "atags"
1999 file in procfs. Useful with kexec.
2000
cb5d39b3
MW
2001config CRASH_DUMP
2002 bool "Build kdump crash kernel (EXPERIMENTAL)"
cb5d39b3
MW
2003 help
2004 Generate crash dump after being started by kexec. This should
2005 be normally only set in special crash dump kernels which are
2006 loaded in the main kernel with kexec-tools into a specially
2007 reserved region and then later executed after a crash by
2008 kdump/kexec. The crash dump kernel must be compiled to a
2009 memory address not used by the main kernel
2010
2011 For more details see Documentation/kdump/kdump.txt
2012
e69edc79
EM
2013config AUTO_ZRELADDR
2014 bool "Auto calculation of the decompressed kernel image address"
e69edc79
EM
2015 help
2016 ZRELADDR is the physical address where the decompressed kernel
2017 image will be placed. If AUTO_ZRELADDR is selected, the address
2018 will be determined at run-time by masking the current IP with
2019 0xf8000000. This assumes the zImage being placed in the first 128MB
2020 from start of memory.
2021
81a0bc39
RF
2022config EFI_STUB
2023 bool
2024
2025config EFI
2026 bool "UEFI runtime support"
2027 depends on OF && !CPU_BIG_ENDIAN && MMU && AUTO_ZRELADDR && !XIP_KERNEL
2028 select UCS2_STRING
2029 select EFI_PARAMS_FROM_FDT
2030 select EFI_STUB
2031 select EFI_ARMSTUB
2032 select EFI_RUNTIME_WRAPPERS
2033 ---help---
2034 This option provides support for runtime services provided
2035 by UEFI firmware (such as non-volatile variables, realtime
2036 clock, and platform reset). A UEFI stub is also provided to
2037 allow the kernel to be booted as an EFI application. This
2038 is only useful for kernels that may run on systems that have
2039 UEFI firmware.
2040
1da177e4
LT
2041endmenu
2042
ac9d7efc 2043menu "CPU Power Management"
1da177e4 2044
1da177e4 2045source "drivers/cpufreq/Kconfig"
1da177e4 2046
ac9d7efc
RK
2047source "drivers/cpuidle/Kconfig"
2048
2049endmenu
2050
1da177e4
LT
2051menu "Floating point emulation"
2052
2053comment "At least one emulation must be selected"
2054
2055config FPE_NWFPE
2056 bool "NWFPE math emulation"
593c252a 2057 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
1da177e4
LT
2058 ---help---
2059 Say Y to include the NWFPE floating point emulator in the kernel.
2060 This is necessary to run most binaries. Linux does not currently
2061 support floating point hardware so you need to say Y here even if
2062 your machine has an FPA or floating point co-processor podule.
2063
2064 You may say N here if you are going to load the Acorn FPEmulator
2065 early in the bootup.
2066
2067config FPE_NWFPE_XP
2068 bool "Support extended precision"
bedf142b 2069 depends on FPE_NWFPE
1da177e4
LT
2070 help
2071 Say Y to include 80-bit support in the kernel floating-point
2072 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2073 Note that gcc does not generate 80-bit operations by default,
2074 so in most cases this option only enlarges the size of the
2075 floating point emulator without any good reason.
2076
2077 You almost surely want to say N here.
2078
2079config FPE_FASTFPE
2080 bool "FastFPE math emulation (EXPERIMENTAL)"
d6f94fa0 2081 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
1da177e4
LT
2082 ---help---
2083 Say Y here to include the FAST floating point emulator in the kernel.
2084 This is an experimental much faster emulator which now also has full
2085 precision for the mantissa. It does not support any exceptions.
2086 It is very simple, and approximately 3-6 times faster than NWFPE.
2087
2088 It should be sufficient for most programs. It may be not suitable
2089 for scientific calculations, but you have to check this for yourself.
2090 If you do not feel you need a faster FP emulation you should better
2091 choose NWFPE.
2092
2093config VFP
2094 bool "VFP-format floating point maths"
e399b1a4 2095 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1da177e4
LT
2096 help
2097 Say Y to include VFP support code in the kernel. This is needed
2098 if your hardware includes a VFP unit.
2099
2100 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2101 release notes and additional status information.
2102
2103 Say N if your target does not have VFP hardware.
2104
25ebee02
CM
2105config VFPv3
2106 bool
2107 depends on VFP
2108 default y if CPU_V7
2109
b5872db4
CM
2110config NEON
2111 bool "Advanced SIMD (NEON) Extension support"
2112 depends on VFPv3 && CPU_V7
2113 help
2114 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2115 Extension.
2116
73c132c1
AB
2117config KERNEL_MODE_NEON
2118 bool "Support for NEON in kernel mode"
c4a30c3b 2119 depends on NEON && AEABI
73c132c1
AB
2120 help
2121 Say Y to include support for NEON in kernel mode.
2122
1da177e4
LT
2123endmenu
2124
2125menu "Userspace binary formats"
2126
2127source "fs/Kconfig.binfmt"
2128
1da177e4
LT
2129endmenu
2130
2131menu "Power management options"
2132
eceab4ac 2133source "kernel/power/Kconfig"
1da177e4 2134
f4cb5700 2135config ARCH_SUSPEND_POSSIBLE
19a0519d 2136 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
f0d75153 2137 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
f4cb5700
JB
2138 def_bool y
2139
15e0d9e3 2140config ARM_CPU_SUSPEND
8b6f2499 2141 def_bool PM_SLEEP || BL_SWITCHER || ARM_PSCI_FW
1b9bdf5c 2142 depends on ARCH_SUSPEND_POSSIBLE
15e0d9e3 2143
603fb42a
SC
2144config ARCH_HIBERNATION_POSSIBLE
2145 bool
2146 depends on MMU
2147 default y if ARCH_SUSPEND_POSSIBLE
2148
1da177e4
LT
2149endmenu
2150
d5950b43
SR
2151source "net/Kconfig"
2152
ac25150f 2153source "drivers/Kconfig"
1da177e4 2154
916f743d
KG
2155source "drivers/firmware/Kconfig"
2156
1da177e4
LT
2157source "fs/Kconfig"
2158
1da177e4
LT
2159source "arch/arm/Kconfig.debug"
2160
2161source "security/Kconfig"
2162
2163source "crypto/Kconfig"
652ccae5
AB
2164if CRYPTO
2165source "arch/arm/crypto/Kconfig"
2166endif
1da177e4
LT
2167
2168source "lib/Kconfig"
749cf76c
CD
2169
2170source "arch/arm/kvm/Kconfig"
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