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