Restartable sequences: ARM 32 architecture support
[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
b1b1d89f 78 select HAVE_RSEQ
b1b3f49c 79 select HAVE_SYSCALL_TRACEPOINTS
af1839eb 80 select HAVE_UID16
31c1fc81 81 select HAVE_VIRT_CPU_ACCOUNTING_GEN
da0ec6f7 82 select IRQ_FORCED_THREADING
171b3f0d 83 select MODULES_USE_ELF_REL
84f452b1 84 select NO_BOOTMEM
aa7d5f18
AB
85 select OF_EARLY_FLATTREE if OF
86 select OF_RESERVED_MEM if OF
171b3f0d
RK
87 select OLD_SIGACTION
88 select OLD_SIGSUSPEND3
b1b3f49c
RK
89 select PERF_USE_VMALLOC
90 select RTC_LIB
91 select SYS_SUPPORTS_APM_EMULATION
171b3f0d
RK
92 # Above selects are sorted alphabetically; please add new ones
93 # according to that. Thanks.
1da177e4
LT
94 help
95 The ARM series is a line of low-power-consumption RISC chip designs
f6c8965a 96 licensed by ARM Ltd and targeted at embedded applications and
1da177e4 97 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
f6c8965a 98 manufactured, but legacy ARM-based PC hardware remains popular in
1da177e4
LT
99 Europe. There is an ARM Linux project with a web page at
100 <http://www.arm.linux.org.uk/>.
101
74facffe 102config ARM_HAS_SG_CHAIN
308c09f1 103 select ARCH_HAS_SG_CHAIN
74facffe
RK
104 bool
105
4ce63fcd
MS
106config NEED_SG_DMA_LENGTH
107 bool
108
109config ARM_DMA_USE_IOMMU
4ce63fcd 110 bool
b1b3f49c
RK
111 select ARM_HAS_SG_CHAIN
112 select NEED_SG_DMA_LENGTH
4ce63fcd 113
60460abf
SWK
114if ARM_DMA_USE_IOMMU
115
116config ARM_DMA_IOMMU_ALIGNMENT
117 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
118 range 4 9
119 default 8
120 help
121 DMA mapping framework by default aligns all buffers to the smallest
122 PAGE_SIZE order which is greater than or equal to the requested buffer
123 size. This works well for buffers up to a few hundreds kilobytes, but
124 for larger buffers it just a waste of address space. Drivers which has
125 relatively small addressing window (like 64Mib) might run out of
126 virtual space with just a few allocations.
127
128 With this parameter you can specify the maximum PAGE_SIZE order for
129 DMA IOMMU buffers. Larger buffers will be aligned only to this
130 specified order. The order is expressed as a power of two multiplied
131 by the PAGE_SIZE.
132
133endif
134
0b05da72
HUK
135config MIGHT_HAVE_PCI
136 bool
137
75e7153a
RB
138config SYS_SUPPORTS_APM_EMULATION
139 bool
140
bc581770
LW
141config HAVE_TCM
142 bool
143 select GENERIC_ALLOCATOR
144
e119bfff
RK
145config HAVE_PROC_CPU
146 bool
147
ce816fa8 148config NO_IOPORT_MAP
5ea81769 149 bool
5ea81769 150
1da177e4
LT
151config EISA
152 bool
153 ---help---
154 The Extended Industry Standard Architecture (EISA) bus was
155 developed as an open alternative to the IBM MicroChannel bus.
156
157 The EISA bus provided some of the features of the IBM MicroChannel
158 bus while maintaining backward compatibility with cards made for
159 the older ISA bus. The EISA bus saw limited use between 1988 and
160 1995 when it was made obsolete by the PCI bus.
161
162 Say Y here if you are building a kernel for an EISA-based machine.
163
164 Otherwise, say N.
165
166config SBUS
167 bool
168
f16fb1ec
RK
169config STACKTRACE_SUPPORT
170 bool
171 default y
172
173config LOCKDEP_SUPPORT
174 bool
175 default y
176
7ad1bcb2
RK
177config TRACE_IRQFLAGS_SUPPORT
178 bool
cb1293e2 179 default !CPU_V7M
7ad1bcb2 180
1da177e4
LT
181config RWSEM_XCHGADD_ALGORITHM
182 bool
8a87411b 183 default y
1da177e4 184
f0d1b0b3
DH
185config ARCH_HAS_ILOG2_U32
186 bool
f0d1b0b3
DH
187
188config ARCH_HAS_ILOG2_U64
189 bool
f0d1b0b3 190
4a1b5733
EV
191config ARCH_HAS_BANDGAP
192 bool
193
a5f4c561
SA
194config FIX_EARLYCON_MEM
195 def_bool y if MMU
196
b89c3b16
AM
197config GENERIC_HWEIGHT
198 bool
199 default y
200
1da177e4
LT
201config GENERIC_CALIBRATE_DELAY
202 bool
203 default y
204
a08b6b79
Z
205config ARCH_MAY_HAVE_PC_FDC
206 bool
207
5ac6da66
CL
208config ZONE_DMA
209 bool
5ac6da66 210
ccd7ab7f
FT
211config NEED_DMA_MAP_STATE
212 def_bool y
213
c7edc9e3
DL
214config ARCH_SUPPORTS_UPROBES
215 def_bool y
216
58af4a24
RH
217config ARCH_HAS_DMA_SET_COHERENT_MASK
218 bool
219
1da177e4
LT
220config GENERIC_ISA_DMA
221 bool
222
1da177e4
LT
223config FIQ
224 bool
225
13a5045d
RH
226config NEED_RET_TO_USER
227 bool
228
034d2f5a
AV
229config ARCH_MTD_XIP
230 bool
231
c760fc19
HC
232config VECTORS_BASE
233 hex
6afd6fae 234 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
c760fc19
HC
235 default DRAM_BASE if REMAP_VECTORS_TO_RAM
236 default 0x00000000
237 help
19accfd3
RK
238 The base address of exception vectors. This must be two pages
239 in size.
c760fc19 240
dc21af99 241config ARM_PATCH_PHYS_VIRT
c1becedc
RK
242 bool "Patch physical to virtual translations at runtime" if EMBEDDED
243 default y
b511d75d 244 depends on !XIP_KERNEL && MMU
dc21af99 245 help
111e9a5c
RK
246 Patch phys-to-virt and virt-to-phys translation functions at
247 boot and module load time according to the position of the
248 kernel in system memory.
dc21af99 249
111e9a5c 250 This can only be used with non-XIP MMU kernels where the base
daece596 251 of physical memory is at a 16MB boundary.
dc21af99 252
c1becedc
RK
253 Only disable this option if you know that you do not require
254 this feature (eg, building a kernel for a single machine) and
255 you need to shrink the kernel to the minimal size.
dc21af99 256
c334bc15
RH
257config NEED_MACH_IO_H
258 bool
259 help
260 Select this when mach/io.h is required to provide special
261 definitions for this platform. The need for mach/io.h should
262 be avoided when possible.
263
0cdc8b92 264config NEED_MACH_MEMORY_H
1b9f95f8
NP
265 bool
266 help
0cdc8b92
NP
267 Select this when mach/memory.h is required to provide special
268 definitions for this platform. The need for mach/memory.h should
269 be avoided when possible.
dc21af99 270
1b9f95f8 271config PHYS_OFFSET
974c0724 272 hex "Physical address of main memory" if MMU
c6f54a9b 273 depends on !ARM_PATCH_PHYS_VIRT
974c0724 274 default DRAM_BASE if !MMU
c6f54a9b 275 default 0x00000000 if ARCH_EBSA110 || \
c6f54a9b
UKK
276 ARCH_FOOTBRIDGE || \
277 ARCH_INTEGRATOR || \
278 ARCH_IOP13XX || \
279 ARCH_KS8695 || \
280 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
281 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
282 default 0x20000000 if ARCH_S5PV210
283 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
b8824c9a 284 default 0xc0000000 if ARCH_SA1100
111e9a5c 285 help
1b9f95f8
NP
286 Please provide the physical address corresponding to the
287 location of main memory in your system.
cada3c08 288
87e040b6
SG
289config GENERIC_BUG
290 def_bool y
291 depends on BUG
292
1bcad26e
KS
293config PGTABLE_LEVELS
294 int
295 default 3 if ARM_LPAE
296 default 2
297
1da177e4
LT
298source "init/Kconfig"
299
dc52ddc0
MH
300source "kernel/Kconfig.freezer"
301
1da177e4
LT
302menu "System Type"
303
3c427975
HC
304config MMU
305 bool "MMU-based Paged Memory Management Support"
306 default y
307 help
308 Select if you want MMU-based virtualised addressing space
309 support by paged memory management. If unsure, say 'Y'.
310
e0c25d95
DC
311config ARCH_MMAP_RND_BITS_MIN
312 default 8
313
314config ARCH_MMAP_RND_BITS_MAX
315 default 14 if PAGE_OFFSET=0x40000000
316 default 15 if PAGE_OFFSET=0x80000000
317 default 16
318
ccf50e23
RK
319#
320# The "ARM system type" choice list is ordered alphabetically by option
321# text. Please add new entries in the option alphabetic order.
322#
1da177e4
LT
323choice
324 prompt "ARM system type"
70722803 325 default ARM_SINGLE_ARMV7M if !MMU
1420b22b 326 default ARCH_MULTIPLATFORM if MMU
1da177e4 327
387798b3
RH
328config ARCH_MULTIPLATFORM
329 bool "Allow multiple platforms to be selected"
b1b3f49c 330 depends on MMU
ddb902cc 331 select ARCH_WANT_OPTIONAL_GPIOLIB
42dc836d 332 select ARM_HAS_SG_CHAIN
387798b3
RH
333 select ARM_PATCH_PHYS_VIRT
334 select AUTO_ZRELADDR
6d0add40 335 select CLKSRC_OF
66314223 336 select COMMON_CLK
ddb902cc 337 select GENERIC_CLOCKEVENTS
08d38beb 338 select MIGHT_HAVE_PCI
387798b3 339 select MULTI_IRQ_HANDLER
66314223
DN
340 select SPARSE_IRQ
341 select USE_OF
66314223 342
9c77bc43
SA
343config ARM_SINGLE_ARMV7M
344 bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
345 depends on !MMU
346 select ARCH_WANT_OPTIONAL_GPIOLIB
347 select ARM_NVIC
499f1640 348 select AUTO_ZRELADDR
9c77bc43
SA
349 select CLKSRC_OF
350 select COMMON_CLK
351 select CPU_V7M
352 select GENERIC_CLOCKEVENTS
353 select NO_IOPORT_MAP
354 select SPARSE_IRQ
355 select USE_OF
356
4af6fee1 357
93e22567
RK
358config ARCH_CLPS711X
359 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
a3b8d4a5 360 select ARCH_REQUIRE_GPIOLIB
ea7d1bc9 361 select AUTO_ZRELADDR
c99f72ad 362 select CLKSRC_MMIO
93e22567
RK
363 select COMMON_CLK
364 select CPU_ARM720T
4a8355c4 365 select GENERIC_CLOCKEVENTS
6597619f 366 select MFD_SYSCON
e4e3a37d 367 select SOC_BUS
93e22567
RK
368 help
369 Support for Cirrus Logic 711x/721x/731x based boards.
370
788c9700
RK
371config ARCH_GEMINI
372 bool "Cortina Systems Gemini"
788c9700 373 select ARCH_REQUIRE_GPIOLIB
f3372c01 374 select CLKSRC_MMIO
b1b3f49c 375 select CPU_FA526
f3372c01 376 select GENERIC_CLOCKEVENTS
788c9700
RK
377 help
378 Support for the Cortina Systems Gemini family SoCs
379
1da177e4
LT
380config ARCH_EBSA110
381 bool "EBSA-110"
b1b3f49c 382 select ARCH_USES_GETTIMEOFFSET
c750815e 383 select CPU_SA110
f7e68bbf 384 select ISA
c334bc15 385 select NEED_MACH_IO_H
0cdc8b92 386 select NEED_MACH_MEMORY_H
ce816fa8 387 select NO_IOPORT_MAP
1da177e4
LT
388 help
389 This is an evaluation board for the StrongARM processor available
f6c8965a 390 from Digital. It has limited hardware on-board, including an
1da177e4
LT
391 Ethernet interface, two PCMCIA sockets, two serial ports and a
392 parallel port.
393
e7736d47
LB
394config ARCH_EP93XX
395 bool "EP93xx-based"
b1b3f49c
RK
396 select ARCH_HAS_HOLES_MEMORYMODEL
397 select ARCH_REQUIRE_GPIOLIB
e7736d47 398 select ARM_AMBA
b8824c9a 399 select ARM_PATCH_PHYS_VIRT
e7736d47 400 select ARM_VIC
b8824c9a 401 select AUTO_ZRELADDR
6d803ba7 402 select CLKDEV_LOOKUP
000bc178 403 select CLKSRC_MMIO
b1b3f49c 404 select CPU_ARM920T
000bc178 405 select GENERIC_CLOCKEVENTS
e7736d47
LB
406 help
407 This enables support for the Cirrus EP93xx series of CPUs.
408
1da177e4
LT
409config ARCH_FOOTBRIDGE
410 bool "FootBridge"
c750815e 411 select CPU_SA110
1da177e4 412 select FOOTBRIDGE
4e8d7637 413 select GENERIC_CLOCKEVENTS
d0ee9f40 414 select HAVE_IDE
8ef6e620 415 select NEED_MACH_IO_H if !MMU
0cdc8b92 416 select NEED_MACH_MEMORY_H
f999b8bd
MM
417 help
418 Support for systems based on the DC21285 companion chip
419 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
1da177e4 420
4af6fee1
DS
421config ARCH_NETX
422 bool "Hilscher NetX based"
b1b3f49c 423 select ARM_VIC
234b6ced 424 select CLKSRC_MMIO
c750815e 425 select CPU_ARM926T
2fcfe6b8 426 select GENERIC_CLOCKEVENTS
f999b8bd 427 help
4af6fee1
DS
428 This enables support for systems based on the Hilscher NetX Soc
429
3b938be6
RK
430config ARCH_IOP13XX
431 bool "IOP13xx-based"
432 depends on MMU
b1b3f49c 433 select CPU_XSC3
0cdc8b92 434 select NEED_MACH_MEMORY_H
13a5045d 435 select NEED_RET_TO_USER
b1b3f49c
RK
436 select PCI
437 select PLAT_IOP
438 select VMSPLIT_1G
37ebbcff 439 select SPARSE_IRQ
3b938be6
RK
440 help
441 Support for Intel's IOP13XX (XScale) family of processors.
442
3f7e5815
LB
443config ARCH_IOP32X
444 bool "IOP32x-based"
a4f7e763 445 depends on MMU
b1b3f49c 446 select ARCH_REQUIRE_GPIOLIB
c750815e 447 select CPU_XSCALE
e9004f50 448 select GPIO_IOP
13a5045d 449 select NEED_RET_TO_USER
f7e68bbf 450 select PCI
b1b3f49c 451 select PLAT_IOP
f999b8bd 452 help
3f7e5815
LB
453 Support for Intel's 80219 and IOP32X (XScale) family of
454 processors.
455
456config ARCH_IOP33X
457 bool "IOP33x-based"
458 depends on MMU
b1b3f49c 459 select ARCH_REQUIRE_GPIOLIB
c750815e 460 select CPU_XSCALE
e9004f50 461 select GPIO_IOP
13a5045d 462 select NEED_RET_TO_USER
3f7e5815 463 select PCI
b1b3f49c 464 select PLAT_IOP
3f7e5815
LB
465 help
466 Support for Intel's IOP33X (XScale) family of processors.
1da177e4 467
3b938be6
RK
468config ARCH_IXP4XX
469 bool "IXP4xx-based"
a4f7e763 470 depends on MMU
58af4a24 471 select ARCH_HAS_DMA_SET_COHERENT_MASK
b1b3f49c 472 select ARCH_REQUIRE_GPIOLIB
51aaf81f 473 select ARCH_SUPPORTS_BIG_ENDIAN
234b6ced 474 select CLKSRC_MMIO
c750815e 475 select CPU_XSCALE
b1b3f49c 476 select DMABOUNCE if PCI
3b938be6 477 select GENERIC_CLOCKEVENTS
0b05da72 478 select MIGHT_HAVE_PCI
c334bc15 479 select NEED_MACH_IO_H
9296d94d 480 select USB_EHCI_BIG_ENDIAN_DESC
171b3f0d 481 select USB_EHCI_BIG_ENDIAN_MMIO
c4713074 482 help
3b938be6 483 Support for Intel's IXP4XX (XScale) family of processors.
c4713074 484
edabd38e
SB
485config ARCH_DOVE
486 bool "Marvell Dove"
edabd38e 487 select ARCH_REQUIRE_GPIOLIB
756b2531 488 select CPU_PJ4
edabd38e 489 select GENERIC_CLOCKEVENTS
0f81bd43 490 select MIGHT_HAVE_PCI
b8cd337c 491 select MULTI_IRQ_HANDLER
171b3f0d 492 select MVEBU_MBUS
9139acd1
SH
493 select PINCTRL
494 select PINCTRL_DOVE
abcda1dc 495 select PLAT_ORION_LEGACY
0bd86961 496 select SPARSE_IRQ
c5d431e8 497 select PM_GENERIC_DOMAINS if PM
788c9700 498 help
edabd38e 499 Support for the Marvell Dove SoC 88AP510
788c9700
RK
500
501config ARCH_KS8695
502 bool "Micrel/Kendin KS8695"
98830bc9 503 select ARCH_REQUIRE_GPIOLIB
c7e783d6 504 select CLKSRC_MMIO
b1b3f49c 505 select CPU_ARM922T
c7e783d6 506 select GENERIC_CLOCKEVENTS
b1b3f49c 507 select NEED_MACH_MEMORY_H
788c9700
RK
508 help
509 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
510 System-on-Chip devices.
511
788c9700
RK
512config ARCH_W90X900
513 bool "Nuvoton W90X900 CPU"
c52d3d68 514 select ARCH_REQUIRE_GPIOLIB
6d803ba7 515 select CLKDEV_LOOKUP
6fa5d5f7 516 select CLKSRC_MMIO
b1b3f49c 517 select CPU_ARM926T
58b5369e 518 select GENERIC_CLOCKEVENTS
788c9700 519 help
a8bc4ead 520 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
521 At present, the w90x900 has been renamed nuc900, regarding
522 the ARM series product line, you can login the following
523 link address to know more.
524
525 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
526 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
788c9700 527
93e22567
RK
528config ARCH_LPC32XX
529 bool "NXP LPC32XX"
530 select ARCH_REQUIRE_GPIOLIB
531 select ARM_AMBA
532 select CLKDEV_LOOKUP
c227f127
VZ
533 select CLKSRC_LPC32XX
534 select COMMON_CLK
93e22567
RK
535 select CPU_ARM926T
536 select GENERIC_CLOCKEVENTS
8cb17b5e
VZ
537 select MULTI_IRQ_HANDLER
538 select SPARSE_IRQ
93e22567
RK
539 select USE_OF
540 help
541 Support for the NXP LPC32XX family of processors
542
1da177e4 543config ARCH_PXA
2c8086a5 544 bool "PXA2xx/PXA3xx-based"
a4f7e763 545 depends on MMU
b1b3f49c
RK
546 select ARCH_MTD_XIP
547 select ARCH_REQUIRE_GPIOLIB
548 select ARM_CPU_SUSPEND if PM
549 select AUTO_ZRELADDR
a1c0a6ad 550 select COMMON_CLK
6d803ba7 551 select CLKDEV_LOOKUP
389d9b58 552 select CLKSRC_PXA
234b6ced 553 select CLKSRC_MMIO
6f6caeaa 554 select CLKSRC_OF
2f202861 555 select CPU_XSCALE if !CPU_XSC3
981d0f39 556 select GENERIC_CLOCKEVENTS
157d2644 557 select GPIO_PXA
d0ee9f40 558 select HAVE_IDE
d6cf30ca 559 select IRQ_DOMAIN
b1b3f49c 560 select MULTI_IRQ_HANDLER
b1b3f49c
RK
561 select PLAT_PXA
562 select SPARSE_IRQ
f999b8bd 563 help
2c8086a5 564 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
1da177e4
LT
565
566config ARCH_RPC
567 bool "RiscPC"
868e87cc 568 depends on MMU
1da177e4 569 select ARCH_ACORN
a08b6b79 570 select ARCH_MAY_HAVE_PC_FDC
07f841b7 571 select ARCH_SPARSEMEM_ENABLE
5cfc8ee0 572 select ARCH_USES_GETTIMEOFFSET
fa04e209 573 select CPU_SA110
b1b3f49c 574 select FIQ
d0ee9f40 575 select HAVE_IDE
b1b3f49c
RK
576 select HAVE_PATA_PLATFORM
577 select ISA_DMA_API
c334bc15 578 select NEED_MACH_IO_H
0cdc8b92 579 select NEED_MACH_MEMORY_H
ce816fa8 580 select NO_IOPORT_MAP
1da177e4
LT
581 help
582 On the Acorn Risc-PC, Linux can support the internal IDE disk and
583 CD-ROM interface, serial and parallel port, and the floppy drive.
584
585config ARCH_SA1100
586 bool "SA1100-based"
b1b3f49c
RK
587 select ARCH_MTD_XIP
588 select ARCH_REQUIRE_GPIOLIB
589 select ARCH_SPARSEMEM_ENABLE
590 select CLKDEV_LOOKUP
591 select CLKSRC_MMIO
389d9b58
DL
592 select CLKSRC_PXA
593 select CLKSRC_OF if OF
1937f5b9 594 select CPU_FREQ
b1b3f49c 595 select CPU_SA1100
3e238be2 596 select GENERIC_CLOCKEVENTS
d0ee9f40 597 select HAVE_IDE
1eca42b4 598 select IRQ_DOMAIN
b1b3f49c 599 select ISA
affcab32 600 select MULTI_IRQ_HANDLER
0cdc8b92 601 select NEED_MACH_MEMORY_H
375dec92 602 select SPARSE_IRQ
f999b8bd
MM
603 help
604 Support for StrongARM 11x0 based boards.
1da177e4 605
b130d5c2
KK
606config ARCH_S3C24XX
607 bool "Samsung S3C24XX SoCs"
53650430 608 select ARCH_REQUIRE_GPIOLIB
335cce74 609 select ATAGS
b1b3f49c 610 select CLKDEV_LOOKUP
4280506a 611 select CLKSRC_SAMSUNG_PWM
7f78b6eb 612 select GENERIC_CLOCKEVENTS
880cf071 613 select GPIO_SAMSUNG
20676c15 614 select HAVE_S3C2410_I2C if I2C
b130d5c2 615 select HAVE_S3C2410_WATCHDOG if WATCHDOG
b1b3f49c 616 select HAVE_S3C_RTC if RTC_CLASS
17453dd2 617 select MULTI_IRQ_HANDLER
c334bc15 618 select NEED_MACH_IO_H
cd8dc7ae 619 select SAMSUNG_ATAGS
1da177e4 620 help
b130d5c2
KK
621 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
622 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
623 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
624 Samsung SMDK2410 development board (and derivatives).
63b1f51b 625
7c6337e2
KH
626config ARCH_DAVINCI
627 bool "TI DaVinci"
b1b3f49c 628 select ARCH_HAS_HOLES_MEMORYMODEL
dce1115b 629 select ARCH_REQUIRE_GPIOLIB
6d803ba7 630 select CLKDEV_LOOKUP
ce32c5c5 631 select CPU_ARM926T
20e9969b 632 select GENERIC_ALLOCATOR
b1b3f49c 633 select GENERIC_CLOCKEVENTS
dc7ad3b3 634 select GENERIC_IRQ_CHIP
b1b3f49c 635 select HAVE_IDE
689e331f 636 select USE_OF
b1b3f49c 637 select ZONE_DMA
7c6337e2
KH
638 help
639 Support for TI's DaVinci platform.
640
a0694861
TL
641config ARCH_OMAP1
642 bool "TI OMAP1"
00a36698 643 depends on MMU
9af915da 644 select ARCH_HAS_HOLES_MEMORYMODEL
a0694861 645 select ARCH_OMAP
21f47fbc 646 select ARCH_REQUIRE_GPIOLIB
b1b3f49c 647 select CLKDEV_LOOKUP
d6e15d78 648 select CLKSRC_MMIO
b1b3f49c 649 select GENERIC_CLOCKEVENTS
a0694861 650 select GENERIC_IRQ_CHIP
a0694861
TL
651 select HAVE_IDE
652 select IRQ_DOMAIN
b694331c 653 select MULTI_IRQ_HANDLER
a0694861
TL
654 select NEED_MACH_IO_H if PCCARD
655 select NEED_MACH_MEMORY_H
685e2d08 656 select SPARSE_IRQ
21f47fbc 657 help
a0694861 658 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
02c981c0 659
1da177e4
LT
660endchoice
661
387798b3
RH
662menu "Multiple platform selection"
663 depends on ARCH_MULTIPLATFORM
664
665comment "CPU Core family selection"
666
f8afae40
AB
667config ARCH_MULTI_V4
668 bool "ARMv4 based platforms (FA526)"
669 depends on !ARCH_MULTI_V6_V7
670 select ARCH_MULTI_V4_V5
671 select CPU_FA526
672
387798b3
RH
673config ARCH_MULTI_V4T
674 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
387798b3 675 depends on !ARCH_MULTI_V6_V7
b1b3f49c 676 select ARCH_MULTI_V4_V5
24e860fb
AB
677 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
678 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
679 CPU_ARM925T || CPU_ARM940T)
387798b3
RH
680
681config ARCH_MULTI_V5
682 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
387798b3 683 depends on !ARCH_MULTI_V6_V7
b1b3f49c 684 select ARCH_MULTI_V4_V5
12567bbd 685 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
24e860fb
AB
686 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
687 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
387798b3
RH
688
689config ARCH_MULTI_V4_V5
690 bool
691
692config ARCH_MULTI_V6
8dda05cc 693 bool "ARMv6 based platforms (ARM11)"
387798b3 694 select ARCH_MULTI_V6_V7
42f4754a 695 select CPU_V6K
387798b3
RH
696
697config ARCH_MULTI_V7
8dda05cc 698 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
387798b3
RH
699 default y
700 select ARCH_MULTI_V6_V7
b1b3f49c 701 select CPU_V7
90bc8ac7 702 select HAVE_SMP
387798b3
RH
703
704config ARCH_MULTI_V6_V7
705 bool
9352b05b 706 select MIGHT_HAVE_CACHE_L2X0
387798b3
RH
707
708config ARCH_MULTI_CPU_AUTO
709 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
710 select ARCH_MULTI_V5
711
712endmenu
713
05e2a3de 714config ARCH_VIRT
e3246542
MY
715 bool "Dummy Virtual Machine"
716 depends on ARCH_MULTI_V7
4b8b5f25 717 select ARM_AMBA
05e2a3de 718 select ARM_GIC
0e2f91e9 719 select ARM_GIC_V2M if PCI_MSI
0b28f1db 720 select ARM_GIC_V3
05e2a3de 721 select ARM_PSCI
4b8b5f25 722 select HAVE_ARM_ARCH_TIMER
05e2a3de 723
ccf50e23
RK
724#
725# This is sorted alphabetically by mach-* pathname. However, plat-*
726# Kconfigs may be included either alphabetically (according to the
727# plat- suffix) or along side the corresponding mach-* source.
728#
3e93a22b
GC
729source "arch/arm/mach-mvebu/Kconfig"
730
445d9b30
TZ
731source "arch/arm/mach-alpine/Kconfig"
732
590b460c
LP
733source "arch/arm/mach-artpec/Kconfig"
734
d9bfc86d
OR
735source "arch/arm/mach-asm9260/Kconfig"
736
95b8f20f
RK
737source "arch/arm/mach-at91/Kconfig"
738
1d22924e
AB
739source "arch/arm/mach-axxia/Kconfig"
740
8ac49e04
CD
741source "arch/arm/mach-bcm/Kconfig"
742
1c37fa10
SH
743source "arch/arm/mach-berlin/Kconfig"
744
1da177e4
LT
745source "arch/arm/mach-clps711x/Kconfig"
746
d94f944e
AV
747source "arch/arm/mach-cns3xxx/Kconfig"
748
95b8f20f
RK
749source "arch/arm/mach-davinci/Kconfig"
750
df8d742e
BS
751source "arch/arm/mach-digicolor/Kconfig"
752
95b8f20f
RK
753source "arch/arm/mach-dove/Kconfig"
754
e7736d47
LB
755source "arch/arm/mach-ep93xx/Kconfig"
756
1da177e4
LT
757source "arch/arm/mach-footbridge/Kconfig"
758
59d3a193
PZ
759source "arch/arm/mach-gemini/Kconfig"
760
387798b3
RH
761source "arch/arm/mach-highbank/Kconfig"
762
389ee0c2
HZ
763source "arch/arm/mach-hisi/Kconfig"
764
1da177e4
LT
765source "arch/arm/mach-integrator/Kconfig"
766
3f7e5815
LB
767source "arch/arm/mach-iop32x/Kconfig"
768
769source "arch/arm/mach-iop33x/Kconfig"
1da177e4 770
285f5fa7
DW
771source "arch/arm/mach-iop13xx/Kconfig"
772
1da177e4
LT
773source "arch/arm/mach-ixp4xx/Kconfig"
774
828989ad
SS
775source "arch/arm/mach-keystone/Kconfig"
776
95b8f20f
RK
777source "arch/arm/mach-ks8695/Kconfig"
778
3b8f5030
CC
779source "arch/arm/mach-meson/Kconfig"
780
17723fd3
JJ
781source "arch/arm/mach-moxart/Kconfig"
782
8c2ed9bc
JS
783source "arch/arm/mach-aspeed/Kconfig"
784
794d15b2
SS
785source "arch/arm/mach-mv78xx0/Kconfig"
786
3995eb82 787source "arch/arm/mach-imx/Kconfig"
1da177e4 788
f682a218
MB
789source "arch/arm/mach-mediatek/Kconfig"
790
1d3f33d5
SG
791source "arch/arm/mach-mxs/Kconfig"
792
95b8f20f 793source "arch/arm/mach-netx/Kconfig"
49cbe786 794
95b8f20f 795source "arch/arm/mach-nomadik/Kconfig"
95b8f20f 796
9851ca57
DT
797source "arch/arm/mach-nspire/Kconfig"
798
d48af15e
TL
799source "arch/arm/plat-omap/Kconfig"
800
801source "arch/arm/mach-omap1/Kconfig"
1da177e4 802
1dbae815
TL
803source "arch/arm/mach-omap2/Kconfig"
804
9dd0b194 805source "arch/arm/mach-orion5x/Kconfig"
585cf175 806
387798b3
RH
807source "arch/arm/mach-picoxcell/Kconfig"
808
95b8f20f
RK
809source "arch/arm/mach-pxa/Kconfig"
810source "arch/arm/plat-pxa/Kconfig"
585cf175 811
95b8f20f
RK
812source "arch/arm/mach-mmp/Kconfig"
813
8c9184b7
NA
814source "arch/arm/mach-oxnas/Kconfig"
815
8fc1b0f8
KG
816source "arch/arm/mach-qcom/Kconfig"
817
95b8f20f
RK
818source "arch/arm/mach-realview/Kconfig"
819
d63dc051
HS
820source "arch/arm/mach-rockchip/Kconfig"
821
95b8f20f 822source "arch/arm/mach-sa1100/Kconfig"
edabd38e 823
387798b3
RH
824source "arch/arm/mach-socfpga/Kconfig"
825
a7ed099f 826source "arch/arm/mach-spear/Kconfig"
a21765a7 827
65ebcc11
SK
828source "arch/arm/mach-sti/Kconfig"
829
85fd6d63 830source "arch/arm/mach-s3c24xx/Kconfig"
1da177e4 831
431107ea 832source "arch/arm/mach-s3c64xx/Kconfig"
a08ab637 833
170f4e42
KK
834source "arch/arm/mach-s5pv210/Kconfig"
835
83014579 836source "arch/arm/mach-exynos/Kconfig"
e509b289 837source "arch/arm/plat-samsung/Kconfig"
cc0e72b8 838
882d01f9 839source "arch/arm/mach-shmobile/Kconfig"
52c543f9 840
3b52634f
MR
841source "arch/arm/mach-sunxi/Kconfig"
842
156a0997
BS
843source "arch/arm/mach-prima2/Kconfig"
844
d6de5b02
MG
845source "arch/arm/mach-tango/Kconfig"
846
c5f80065
EG
847source "arch/arm/mach-tegra/Kconfig"
848
95b8f20f 849source "arch/arm/mach-u300/Kconfig"
1da177e4 850
ba56a987
MY
851source "arch/arm/mach-uniphier/Kconfig"
852
95b8f20f 853source "arch/arm/mach-ux500/Kconfig"
1da177e4
LT
854
855source "arch/arm/mach-versatile/Kconfig"
856
ceade897 857source "arch/arm/mach-vexpress/Kconfig"
420c34e4 858source "arch/arm/plat-versatile/Kconfig"
ceade897 859
6f35f9a9
TP
860source "arch/arm/mach-vt8500/Kconfig"
861
7ec80ddf 862source "arch/arm/mach-w90x900/Kconfig"
863
acede515
JN
864source "arch/arm/mach-zx/Kconfig"
865
9a45eb69
JC
866source "arch/arm/mach-zynq/Kconfig"
867
499f1640
SA
868# ARMv7-M architecture
869config ARCH_EFM32
870 bool "Energy Micro efm32"
871 depends on ARM_SINGLE_ARMV7M
872 select ARCH_REQUIRE_GPIOLIB
873 help
874 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
875 processors.
876
877config ARCH_LPC18XX
878 bool "NXP LPC18xx/LPC43xx"
879 depends on ARM_SINGLE_ARMV7M
880 select ARCH_HAS_RESET_CONTROLLER
881 select ARM_AMBA
882 select CLKSRC_LPC32XX
883 select PINCTRL
884 help
885 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
886 high performance microcontrollers.
887
888config ARCH_STM32
889 bool "STMicrolectronics STM32"
890 depends on ARM_SINGLE_ARMV7M
891 select ARCH_HAS_RESET_CONTROLLER
892 select ARMV7M_SYSTICK
25263186 893 select CLKSRC_STM32
f64e9804 894 select PINCTRL
499f1640
SA
895 select RESET_CONTROLLER
896 help
897 Support for STMicroelectronics STM32 processors.
898
fa65fc6b
MC
899config MACH_STM32F429
900 bool "STMicrolectronics STM32F429"
901 depends on ARCH_STM32
902 default y
903
1847119d
VM
904config ARCH_MPS2
905 bool "ARM MPS2 paltform"
906 depends on ARM_SINGLE_ARMV7M
907 select ARM_AMBA
908 select CLKSRC_MPS2
909 help
910 Support for Cortex-M Prototyping System (or V2M-MPS2) which comes
911 with a range of available cores like Cortex-M3/M4/M7.
912
913 Please, note that depends which Application Note is used memory map
914 for the platform may vary, so adjustment of RAM base might be needed.
915
1da177e4
LT
916# Definitions to make life easier
917config ARCH_ACORN
918 bool
919
7ae1f7ec
LB
920config PLAT_IOP
921 bool
469d3044 922 select GENERIC_CLOCKEVENTS
7ae1f7ec 923
69b02f6a
LB
924config PLAT_ORION
925 bool
bfe45e0b 926 select CLKSRC_MMIO
b1b3f49c 927 select COMMON_CLK
dc7ad3b3 928 select GENERIC_IRQ_CHIP
278b45b0 929 select IRQ_DOMAIN
69b02f6a 930
abcda1dc
TP
931config PLAT_ORION_LEGACY
932 bool
933 select PLAT_ORION
934
bd5ce433
EM
935config PLAT_PXA
936 bool
937
f4b8b319
RK
938config PLAT_VERSATILE
939 bool
940
d9a1beaa
AC
941source "arch/arm/firmware/Kconfig"
942
1da177e4
LT
943source arch/arm/mm/Kconfig
944
afe4b25e 945config IWMMXT
d93003e8
SH
946 bool "Enable iWMMXt support"
947 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
948 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
afe4b25e
LB
949 help
950 Enable support for iWMMXt context switching at run time if
951 running on a CPU that supports it.
952
52108641 953config MULTI_IRQ_HANDLER
954 bool
955 help
956 Allow each machine to specify it's own IRQ handler at run time.
957
3b93e7b0
HC
958if !MMU
959source "arch/arm/Kconfig-nommu"
960endif
961
3e0a07f8
GC
962config PJ4B_ERRATA_4742
963 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
964 depends on CPU_PJ4B && MACH_ARMADA_370
965 default y
966 help
967 When coming out of either a Wait for Interrupt (WFI) or a Wait for
968 Event (WFE) IDLE states, a specific timing sensitivity exists between
969 the retiring WFI/WFE instructions and the newly issued subsequent
970 instructions. This sensitivity can result in a CPU hang scenario.
971 Workaround:
972 The software must insert either a Data Synchronization Barrier (DSB)
973 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
974 instruction
975
f0c4b8d6
WD
976config ARM_ERRATA_326103
977 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
978 depends on CPU_V6
979 help
980 Executing a SWP instruction to read-only memory does not set bit 11
981 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
982 treat the access as a read, preventing a COW from occurring and
983 causing the faulting task to livelock.
984
9cba3ccc
CM
985config ARM_ERRATA_411920
986 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
e399b1a4 987 depends on CPU_V6 || CPU_V6K
9cba3ccc
CM
988 help
989 Invalidation of the Instruction Cache operation can
990 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
991 It does not affect the MPCore. This option enables the ARM Ltd.
992 recommended workaround.
993
7ce236fc
CM
994config ARM_ERRATA_430973
995 bool "ARM errata: Stale prediction on replaced interworking branch"
996 depends on CPU_V7
997 help
998 This option enables the workaround for the 430973 Cortex-A8
79403cda 999 r1p* erratum. If a code sequence containing an ARM/Thumb
7ce236fc
CM
1000 interworking branch is replaced with another code sequence at the
1001 same virtual address, whether due to self-modifying code or virtual
1002 to physical address re-mapping, Cortex-A8 does not recover from the
1003 stale interworking branch prediction. This results in Cortex-A8
1004 executing the new code sequence in the incorrect ARM or Thumb state.
1005 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1006 and also flushes the branch target cache at every context switch.
1007 Note that setting specific bits in the ACTLR register may not be
1008 available in non-secure mode.
1009
855c551f
CM
1010config ARM_ERRATA_458693
1011 bool "ARM errata: Processor deadlock when a false hazard is created"
1012 depends on CPU_V7
62e4d357 1013 depends on !ARCH_MULTIPLATFORM
855c551f
CM
1014 help
1015 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1016 erratum. For very specific sequences of memory operations, it is
1017 possible for a hazard condition intended for a cache line to instead
1018 be incorrectly associated with a different cache line. This false
1019 hazard might then cause a processor deadlock. The workaround enables
1020 the L1 caching of the NEON accesses and disables the PLD instruction
1021 in the ACTLR register. Note that setting specific bits in the ACTLR
1022 register may not be available in non-secure mode.
1023
0516e464
CM
1024config ARM_ERRATA_460075
1025 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1026 depends on CPU_V7
62e4d357 1027 depends on !ARCH_MULTIPLATFORM
0516e464
CM
1028 help
1029 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1030 erratum. Any asynchronous access to the L2 cache may encounter a
1031 situation in which recent store transactions to the L2 cache are lost
1032 and overwritten with stale memory contents from external memory. The
1033 workaround disables the write-allocate mode for the L2 cache via the
1034 ACTLR register. Note that setting specific bits in the ACTLR register
1035 may not be available in non-secure mode.
1036
9f05027c
WD
1037config ARM_ERRATA_742230
1038 bool "ARM errata: DMB operation may be faulty"
1039 depends on CPU_V7 && SMP
62e4d357 1040 depends on !ARCH_MULTIPLATFORM
9f05027c
WD
1041 help
1042 This option enables the workaround for the 742230 Cortex-A9
1043 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1044 between two write operations may not ensure the correct visibility
1045 ordering of the two writes. This workaround sets a specific bit in
1046 the diagnostic register of the Cortex-A9 which causes the DMB
1047 instruction to behave as a DSB, ensuring the correct behaviour of
1048 the two writes.
1049
a672e99b
WD
1050config ARM_ERRATA_742231
1051 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1052 depends on CPU_V7 && SMP
62e4d357 1053 depends on !ARCH_MULTIPLATFORM
a672e99b
WD
1054 help
1055 This option enables the workaround for the 742231 Cortex-A9
1056 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1057 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1058 accessing some data located in the same cache line, may get corrupted
1059 data due to bad handling of the address hazard when the line gets
1060 replaced from one of the CPUs at the same time as another CPU is
1061 accessing it. This workaround sets specific bits in the diagnostic
1062 register of the Cortex-A9 which reduces the linefill issuing
1063 capabilities of the processor.
1064
69155794
JM
1065config ARM_ERRATA_643719
1066 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1067 depends on CPU_V7 && SMP
e5a5de44 1068 default y
69155794
JM
1069 help
1070 This option enables the workaround for the 643719 Cortex-A9 (prior to
1071 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1072 register returns zero when it should return one. The workaround
1073 corrects this value, ensuring cache maintenance operations which use
1074 it behave as intended and avoiding data corruption.
1075
cdf357f1
WD
1076config ARM_ERRATA_720789
1077 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
e66dc745 1078 depends on CPU_V7
cdf357f1
WD
1079 help
1080 This option enables the workaround for the 720789 Cortex-A9 (prior to
1081 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1082 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1083 As a consequence of this erratum, some TLB entries which should be
1084 invalidated are not, resulting in an incoherency in the system page
1085 tables. The workaround changes the TLB flushing routines to invalidate
1086 entries regardless of the ASID.
475d92fc
WD
1087
1088config ARM_ERRATA_743622
1089 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1090 depends on CPU_V7
62e4d357 1091 depends on !ARCH_MULTIPLATFORM
475d92fc
WD
1092 help
1093 This option enables the workaround for the 743622 Cortex-A9
efbc74ac 1094 (r2p*) erratum. Under very rare conditions, a faulty
475d92fc
WD
1095 optimisation in the Cortex-A9 Store Buffer may lead to data
1096 corruption. This workaround sets a specific bit in the diagnostic
1097 register of the Cortex-A9 which disables the Store Buffer
1098 optimisation, preventing the defect from occurring. This has no
1099 visible impact on the overall performance or power consumption of the
1100 processor.
1101
9a27c27c
WD
1102config ARM_ERRATA_751472
1103 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
ba90c516 1104 depends on CPU_V7
62e4d357 1105 depends on !ARCH_MULTIPLATFORM
9a27c27c
WD
1106 help
1107 This option enables the workaround for the 751472 Cortex-A9 (prior
1108 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1109 completion of a following broadcasted operation if the second
1110 operation is received by a CPU before the ICIALLUIS has completed,
1111 potentially leading to corrupted entries in the cache or TLB.
1112
fcbdc5fe
WD
1113config ARM_ERRATA_754322
1114 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1115 depends on CPU_V7
1116 help
1117 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1118 r3p*) erratum. A speculative memory access may cause a page table walk
1119 which starts prior to an ASID switch but completes afterwards. This
1120 can populate the micro-TLB with a stale entry which may be hit with
1121 the new ASID. This workaround places two dsb instructions in the mm
1122 switching code so that no page table walks can cross the ASID switch.
1123
5dab26af
WD
1124config ARM_ERRATA_754327
1125 bool "ARM errata: no automatic Store Buffer drain"
1126 depends on CPU_V7 && SMP
1127 help
1128 This option enables the workaround for the 754327 Cortex-A9 (prior to
1129 r2p0) erratum. The Store Buffer does not have any automatic draining
1130 mechanism and therefore a livelock may occur if an external agent
1131 continuously polls a memory location waiting to observe an update.
1132 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1133 written polling loops from denying visibility of updates to memory.
1134
145e10e1
CM
1135config ARM_ERRATA_364296
1136 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
fd832478 1137 depends on CPU_V6
145e10e1
CM
1138 help
1139 This options enables the workaround for the 364296 ARM1136
1140 r0p2 erratum (possible cache data corruption with
1141 hit-under-miss enabled). It sets the undocumented bit 31 in
1142 the auxiliary control register and the FI bit in the control
1143 register, thus disabling hit-under-miss without putting the
1144 processor into full low interrupt latency mode. ARM11MPCore
1145 is not affected.
1146
f630c1bd
WD
1147config ARM_ERRATA_764369
1148 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1149 depends on CPU_V7 && SMP
1150 help
1151 This option enables the workaround for erratum 764369
1152 affecting Cortex-A9 MPCore with two or more processors (all
1153 current revisions). Under certain timing circumstances, a data
1154 cache line maintenance operation by MVA targeting an Inner
1155 Shareable memory region may fail to proceed up to either the
1156 Point of Coherency or to the Point of Unification of the
1157 system. This workaround adds a DSB instruction before the
1158 relevant cache maintenance functions and sets a specific bit
1159 in the diagnostic control register of the SCU.
1160
7253b85c
SH
1161config ARM_ERRATA_775420
1162 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1163 depends on CPU_V7
1164 help
1165 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1166 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1167 operation aborts with MMU exception, it might cause the processor
1168 to deadlock. This workaround puts DSB before executing ISB if
1169 an abort may occur on cache maintenance.
1170
93dc6887
CM
1171config ARM_ERRATA_798181
1172 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1173 depends on CPU_V7 && SMP
1174 help
1175 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1176 adequately shooting down all use of the old entries. This
1177 option enables the Linux kernel workaround for this erratum
1178 which sends an IPI to the CPUs that are running the same ASID
1179 as the one being invalidated.
1180
84b6504f
WD
1181config ARM_ERRATA_773022
1182 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1183 depends on CPU_V7
1184 help
1185 This option enables the workaround for the 773022 Cortex-A15
1186 (up to r0p4) erratum. In certain rare sequences of code, the
1187 loop buffer may deliver incorrect instructions. This
1188 workaround disables the loop buffer to avoid the erratum.
1189
1da177e4
LT
1190endmenu
1191
1192source "arch/arm/common/Kconfig"
1193
1da177e4
LT
1194menu "Bus support"
1195
1da177e4
LT
1196config ISA
1197 bool
1da177e4
LT
1198 help
1199 Find out whether you have ISA slots on your motherboard. ISA is the
1200 name of a bus system, i.e. the way the CPU talks to the other stuff
1201 inside your box. Other bus systems are PCI, EISA, MicroChannel
1202 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1203 newer boards don't support it. If you have ISA, say Y, otherwise N.
1204
065909b9 1205# Select ISA DMA controller support
1da177e4
LT
1206config ISA_DMA
1207 bool
065909b9 1208 select ISA_DMA_API
1da177e4 1209
065909b9 1210# Select ISA DMA interface
5cae841b
AV
1211config ISA_DMA_API
1212 bool
5cae841b 1213
1da177e4 1214config PCI
0b05da72 1215 bool "PCI support" if MIGHT_HAVE_PCI
1da177e4
LT
1216 help
1217 Find out whether you have a PCI motherboard. PCI is the name of a
1218 bus system, i.e. the way the CPU talks to the other stuff inside
1219 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1220 VESA. If you have PCI, say Y, otherwise N.
1221
52882173
AV
1222config PCI_DOMAINS
1223 bool
1224 depends on PCI
1225
8c7d1474
LP
1226config PCI_DOMAINS_GENERIC
1227 def_bool PCI_DOMAINS
1228
b080ac8a
MRJ
1229config PCI_NANOENGINE
1230 bool "BSE nanoEngine PCI support"
1231 depends on SA1100_NANOENGINE
1232 help
1233 Enable PCI on the BSE nanoEngine board.
1234
36e23590
MW
1235config PCI_SYSCALL
1236 def_bool PCI
1237
a0113a99
MR
1238config PCI_HOST_ITE8152
1239 bool
1240 depends on PCI && MACH_ARMCORE
1241 default y
1242 select DMABOUNCE
1243
1da177e4
LT
1244source "drivers/pci/Kconfig"
1245
1246source "drivers/pcmcia/Kconfig"
1247
1248endmenu
1249
1250menu "Kernel Features"
1251
3b55658a
DM
1252config HAVE_SMP
1253 bool
1254 help
1255 This option should be selected by machines which have an SMP-
1256 capable CPU.
1257
1258 The only effect of this option is to make the SMP-related
1259 options available to the user for configuration.
1260
1da177e4 1261config SMP
bb2d8130 1262 bool "Symmetric Multi-Processing"
fbb4ddac 1263 depends on CPU_V6K || CPU_V7
bc28248e 1264 depends on GENERIC_CLOCKEVENTS
3b55658a 1265 depends on HAVE_SMP
801bb21c 1266 depends on MMU || ARM_MPU
0361748f 1267 select IRQ_WORK
1da177e4
LT
1268 help
1269 This enables support for systems with more than one CPU. If you have
4a474157
RG
1270 a system with only one CPU, say N. If you have a system with more
1271 than one CPU, say Y.
1da177e4 1272
4a474157 1273 If you say N here, the kernel will run on uni- and multiprocessor
1da177e4 1274 machines, but will use only one CPU of a multiprocessor machine. If
4a474157
RG
1275 you say Y here, the kernel will run on many, but not all,
1276 uniprocessor machines. On a uniprocessor machine, the kernel
1277 will run faster if you say N here.
1da177e4 1278
395cf969 1279 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1da177e4 1280 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
50a23e6e 1281 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1da177e4
LT
1282
1283 If you don't know what to do here, say N.
1284
f00ec48f 1285config SMP_ON_UP
5744ff43 1286 bool "Allow booting SMP kernel on uniprocessor systems"
801bb21c 1287 depends on SMP && !XIP_KERNEL && MMU
f00ec48f
RK
1288 default y
1289 help
1290 SMP kernels contain instructions which fail on non-SMP processors.
1291 Enabling this option allows the kernel to modify itself to make
1292 these instructions safe. Disabling it allows about 1K of space
1293 savings.
1294
1295 If you don't know what to do here, say Y.
1296
c9018aab
VG
1297config ARM_CPU_TOPOLOGY
1298 bool "Support cpu topology definition"
1299 depends on SMP && CPU_V7
1300 default y
1301 help
1302 Support ARM cpu topology definition. The MPIDR register defines
1303 affinity between processors which is then used to describe the cpu
1304 topology of an ARM System.
1305
1306config SCHED_MC
1307 bool "Multi-core scheduler support"
1308 depends on ARM_CPU_TOPOLOGY
1309 help
1310 Multi-core scheduler support improves the CPU scheduler's decision
1311 making when dealing with multi-core CPU chips at a cost of slightly
1312 increased overhead in some places. If unsure say N here.
1313
1314config SCHED_SMT
1315 bool "SMT scheduler support"
1316 depends on ARM_CPU_TOPOLOGY
1317 help
1318 Improves the CPU scheduler's decision making when dealing with
1319 MultiThreading at a cost of slightly increased overhead in some
1320 places. If unsure say N here.
1321
a8cbcd92
RK
1322config HAVE_ARM_SCU
1323 bool
a8cbcd92
RK
1324 help
1325 This option enables support for the ARM system coherency unit
1326
8a4da6e3 1327config HAVE_ARM_ARCH_TIMER
022c03a2
MZ
1328 bool "Architected timer support"
1329 depends on CPU_V7
8a4da6e3 1330 select ARM_ARCH_TIMER
0c403462 1331 select GENERIC_CLOCKEVENTS
022c03a2
MZ
1332 help
1333 This option enables support for the ARM architected timer
1334
f32f4ce2
RK
1335config HAVE_ARM_TWD
1336 bool
da4a686a 1337 select CLKSRC_OF if OF
f32f4ce2
RK
1338 help
1339 This options enables support for the ARM timer and watchdog unit
1340
e8db288e
NP
1341config MCPM
1342 bool "Multi-Cluster Power Management"
1343 depends on CPU_V7 && SMP
1344 help
1345 This option provides the common power management infrastructure
1346 for (multi-)cluster based systems, such as big.LITTLE based
1347 systems.
1348
ebf4a5c5
HZ
1349config MCPM_QUAD_CLUSTER
1350 bool
1351 depends on MCPM
1352 help
1353 To avoid wasting resources unnecessarily, MCPM only supports up
1354 to 2 clusters by default.
1355 Platforms with 3 or 4 clusters that use MCPM must select this
1356 option to allow the additional clusters to be managed.
1357
1c33be57
NP
1358config BIG_LITTLE
1359 bool "big.LITTLE support (Experimental)"
1360 depends on CPU_V7 && SMP
1361 select MCPM
1362 help
1363 This option enables support selections for the big.LITTLE
1364 system architecture.
1365
1366config BL_SWITCHER
1367 bool "big.LITTLE switcher support"
6c044fec 1368 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU && ARM_GIC
51aaf81f 1369 select CPU_PM
1c33be57
NP
1370 help
1371 The big.LITTLE "switcher" provides the core functionality to
1372 transparently handle transition between a cluster of A15's
1373 and a cluster of A7's in a big.LITTLE system.
1374
b22537c6
NP
1375config BL_SWITCHER_DUMMY_IF
1376 tristate "Simple big.LITTLE switcher user interface"
1377 depends on BL_SWITCHER && DEBUG_KERNEL
1378 help
1379 This is a simple and dummy char dev interface to control
1380 the big.LITTLE switcher core code. It is meant for
1381 debugging purposes only.
1382
8d5796d2
LB
1383choice
1384 prompt "Memory split"
006fa259 1385 depends on MMU
8d5796d2
LB
1386 default VMSPLIT_3G
1387 help
1388 Select the desired split between kernel and user memory.
1389
1390 If you are not absolutely sure what you are doing, leave this
1391 option alone!
1392
1393 config VMSPLIT_3G
1394 bool "3G/1G user/kernel split"
63ce446c
NP
1395 config VMSPLIT_3G_OPT
1396 bool "3G/1G user/kernel split (for full 1G low memory)"
8d5796d2
LB
1397 config VMSPLIT_2G
1398 bool "2G/2G user/kernel split"
1399 config VMSPLIT_1G
1400 bool "1G/3G user/kernel split"
1401endchoice
1402
1403config PAGE_OFFSET
1404 hex
006fa259 1405 default PHYS_OFFSET if !MMU
8d5796d2
LB
1406 default 0x40000000 if VMSPLIT_1G
1407 default 0x80000000 if VMSPLIT_2G
63ce446c 1408 default 0xB0000000 if VMSPLIT_3G_OPT
8d5796d2
LB
1409 default 0xC0000000
1410
1da177e4
LT
1411config NR_CPUS
1412 int "Maximum number of CPUs (2-32)"
1413 range 2 32
1414 depends on SMP
1415 default "4"
1416
a054a811 1417config HOTPLUG_CPU
00b7dede 1418 bool "Support for hot-pluggable CPUs"
40b31360 1419 depends on SMP
a054a811
RK
1420 help
1421 Say Y here to experiment with turning CPUs off and on. CPUs
1422 can be controlled through /sys/devices/system/cpu.
1423
2bdd424f
WD
1424config ARM_PSCI
1425 bool "Support for the ARM Power State Coordination Interface (PSCI)"
e679660d 1426 depends on HAVE_ARM_SMCCC
be120397 1427 select ARM_PSCI_FW
2bdd424f
WD
1428 help
1429 Say Y here if you want Linux to communicate with system firmware
1430 implementing the PSCI specification for CPU-centric power
1431 management operations described in ARM document number ARM DEN
1432 0022A ("Power State Coordination Interface System Software on
1433 ARM processors").
1434
2a6ad871
MR
1435# The GPIO number here must be sorted by descending number. In case of
1436# a multiplatform kernel, we just want the highest value required by the
1437# selected platforms.
44986ab0
PDSN
1438config ARCH_NR_GPIO
1439 int
b35d2e56
GF
1440 default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1441 ARCH_ZYNQ
aa42587a
TF
1442 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1443 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
eb171a99 1444 default 416 if ARCH_SUNXI
06b851e5 1445 default 392 if ARCH_U8500
01bb914c 1446 default 352 if ARCH_VT8500
7b5da4c3 1447 default 288 if ARCH_ROCKCHIP
2a6ad871 1448 default 264 if MACH_H4700
44986ab0
PDSN
1449 default 0
1450 help
1451 Maximum number of GPIOs in the system.
1452
1453 If unsure, leave the default value.
1454
d45a398f 1455source kernel/Kconfig.preempt
1da177e4 1456
c9218b16 1457config HZ_FIXED
f8065813 1458 int
070b8b43 1459 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
a73ddc61 1460 ARCH_S5PV210 || ARCH_EXYNOS4
1164f672 1461 default 128 if SOC_AT91RM9200
47d84682 1462 default 0
c9218b16
RK
1463
1464choice
47d84682 1465 depends on HZ_FIXED = 0
c9218b16
RK
1466 prompt "Timer frequency"
1467
1468config HZ_100
1469 bool "100 Hz"
1470
1471config HZ_200
1472 bool "200 Hz"
1473
1474config HZ_250
1475 bool "250 Hz"
1476
1477config HZ_300
1478 bool "300 Hz"
1479
1480config HZ_500
1481 bool "500 Hz"
1482
1483config HZ_1000
1484 bool "1000 Hz"
1485
1486endchoice
1487
1488config HZ
1489 int
47d84682 1490 default HZ_FIXED if HZ_FIXED != 0
c9218b16
RK
1491 default 100 if HZ_100
1492 default 200 if HZ_200
1493 default 250 if HZ_250
1494 default 300 if HZ_300
1495 default 500 if HZ_500
1496 default 1000
1497
1498config SCHED_HRTICK
1499 def_bool HIGH_RES_TIMERS
f8065813 1500
16c79651 1501config THUMB2_KERNEL
bc7dea00 1502 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
4477ca45 1503 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
bc7dea00 1504 default y if CPU_THUMBONLY
16c79651
CM
1505 select AEABI
1506 select ARM_ASM_UNIFIED
89bace65 1507 select ARM_UNWIND
16c79651
CM
1508 help
1509 By enabling this option, the kernel will be compiled in
1510 Thumb-2 mode. A compiler/assembler that understand the unified
1511 ARM-Thumb syntax is needed.
1512
1513 If unsure, say N.
1514
6f685c5c
DM
1515config THUMB2_AVOID_R_ARM_THM_JUMP11
1516 bool "Work around buggy Thumb-2 short branch relocations in gas"
1517 depends on THUMB2_KERNEL && MODULES
1518 default y
1519 help
1520 Various binutils versions can resolve Thumb-2 branches to
1521 locally-defined, preemptible global symbols as short-range "b.n"
1522 branch instructions.
1523
1524 This is a problem, because there's no guarantee the final
1525 destination of the symbol, or any candidate locations for a
1526 trampoline, are within range of the branch. For this reason, the
1527 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1528 relocation in modules at all, and it makes little sense to add
1529 support.
1530
1531 The symptom is that the kernel fails with an "unsupported
1532 relocation" error when loading some modules.
1533
1534 Until fixed tools are available, passing
1535 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1536 code which hits this problem, at the cost of a bit of extra runtime
1537 stack usage in some cases.
1538
1539 The problem is described in more detail at:
1540 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1541
1542 Only Thumb-2 kernels are affected.
1543
1544 Unless you are sure your tools don't have this problem, say Y.
1545
0becb088
CM
1546config ARM_ASM_UNIFIED
1547 bool
1548
42f25bdd
NP
1549config ARM_PATCH_IDIV
1550 bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()"
1551 depends on CPU_32v7 && !XIP_KERNEL
1552 default y
1553 help
1554 The ARM compiler inserts calls to __aeabi_idiv() and
1555 __aeabi_uidiv() when it needs to perform division on signed
1556 and unsigned integers. Some v7 CPUs have support for the sdiv
1557 and udiv instructions that can be used to implement those
1558 functions.
1559
1560 Enabling this option allows the kernel to modify itself to
1561 replace the first two instructions of these library functions
1562 with the sdiv or udiv plus "bx lr" instructions when the CPU
1563 it is running on supports them. Typically this will be faster
1564 and less power intensive than running the original library
1565 code to do integer division.
1566
704bdda0
NP
1567config AEABI
1568 bool "Use the ARM EABI to compile the kernel"
1569 help
1570 This option allows for the kernel to be compiled using the latest
1571 ARM ABI (aka EABI). This is only useful if you are using a user
1572 space environment that is also compiled with EABI.
1573
1574 Since there are major incompatibilities between the legacy ABI and
1575 EABI, especially with regard to structure member alignment, this
1576 option also changes the kernel syscall calling convention to
1577 disambiguate both ABIs and allow for backward compatibility support
1578 (selected with CONFIG_OABI_COMPAT).
1579
1580 To use this you need GCC version 4.0.0 or later.
1581
6c90c872 1582config OABI_COMPAT
a73a3ff1 1583 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
d6f94fa0 1584 depends on AEABI && !THUMB2_KERNEL
6c90c872
NP
1585 help
1586 This option preserves the old syscall interface along with the
1587 new (ARM EABI) one. It also provides a compatibility layer to
1588 intercept syscalls that have structure arguments which layout
1589 in memory differs between the legacy ABI and the new ARM EABI
1590 (only for non "thumb" binaries). This option adds a tiny
1591 overhead to all syscalls and produces a slightly larger kernel.
91702175
KC
1592
1593 The seccomp filter system will not be available when this is
1594 selected, since there is no way yet to sensibly distinguish
1595 between calling conventions during filtering.
1596
6c90c872
NP
1597 If you know you'll be using only pure EABI user space then you
1598 can say N here. If this option is not selected and you attempt
1599 to execute a legacy ABI binary then the result will be
1600 UNPREDICTABLE (in fact it can be predicted that it won't work
b02f8467 1601 at all). If in doubt say N.
6c90c872 1602
eb33575c 1603config ARCH_HAS_HOLES_MEMORYMODEL
e80d6a24 1604 bool
e80d6a24 1605
05944d74
RK
1606config ARCH_SPARSEMEM_ENABLE
1607 bool
1608
07a2f737
RK
1609config ARCH_SPARSEMEM_DEFAULT
1610 def_bool ARCH_SPARSEMEM_ENABLE
1611
05944d74 1612config ARCH_SELECT_MEMORY_MODEL
be370302 1613 def_bool ARCH_SPARSEMEM_ENABLE
c80d79d7 1614
7b7bf499
WD
1615config HAVE_ARCH_PFN_VALID
1616 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1617
b8cd51af
SC
1618config HAVE_GENERIC_RCU_GUP
1619 def_bool y
1620 depends on ARM_LPAE
1621
053a96ca 1622config HIGHMEM
e8db89a2
RK
1623 bool "High Memory Support"
1624 depends on MMU
053a96ca
NP
1625 help
1626 The address space of ARM processors is only 4 Gigabytes large
1627 and it has to accommodate user address space, kernel address
1628 space as well as some memory mapped IO. That means that, if you
1629 have a large amount of physical memory and/or IO, not all of the
1630 memory can be "permanently mapped" by the kernel. The physical
1631 memory that is not permanently mapped is called "high memory".
1632
1633 Depending on the selected kernel/user memory split, minimum
1634 vmalloc space and actual amount of RAM, you may not need this
1635 option which should result in a slightly faster kernel.
1636
1637 If unsure, say n.
1638
65cec8e3 1639config HIGHPTE
9a431bd5 1640 bool "Allocate 2nd-level pagetables from highmem" if EXPERT
65cec8e3 1641 depends on HIGHMEM
9a431bd5 1642 default y
b4d103d1
RK
1643 help
1644 The VM uses one page of physical memory for each page table.
1645 For systems with a lot of processes, this can use a lot of
1646 precious low memory, eventually leading to low memory being
1647 consumed by page tables. Setting this option will allow
1648 user-space 2nd level page tables to reside in high memory.
65cec8e3 1649
a5e090ac
RK
1650config CPU_SW_DOMAIN_PAN
1651 bool "Enable use of CPU domains to implement privileged no-access"
1652 depends on MMU && !ARM_LPAE
1b8873a0
JI
1653 default y
1654 help
a5e090ac
RK
1655 Increase kernel security by ensuring that normal kernel accesses
1656 are unable to access userspace addresses. This can help prevent
1657 use-after-free bugs becoming an exploitable privilege escalation
1658 by ensuring that magic values (such as LIST_POISON) will always
1659 fault when dereferenced.
1660
1661 CPUs with low-vector mappings use a best-efforts implementation.
1662 Their lower 1MB needs to remain accessible for the vectors, but
1663 the remainder of userspace will become appropriately inaccessible.
65cec8e3 1664
1b8873a0 1665config HW_PERF_EVENTS
fa8ad788
MR
1666 def_bool y
1667 depends on ARM_PMU
1b8873a0 1668
1355e2a6
CM
1669config SYS_SUPPORTS_HUGETLBFS
1670 def_bool y
1671 depends on ARM_LPAE
1672
8d962507
CM
1673config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1674 def_bool y
1675 depends on ARM_LPAE
1676
4bfab203
SC
1677config ARCH_WANT_GENERAL_HUGETLB
1678 def_bool y
1679
7d485f64
AB
1680config ARM_MODULE_PLTS
1681 bool "Use PLTs to allow module memory to spill over into vmalloc area"
1682 depends on MODULES
1683 help
1684 Allocate PLTs when loading modules so that jumps and calls whose
1685 targets are too far away for their relative offsets to be encoded
1686 in the instructions themselves can be bounced via veneers in the
1687 module's PLT. This allows modules to be allocated in the generic
1688 vmalloc area after the dedicated module memory area has been
1689 exhausted. The modules will use slightly more memory, but after
1690 rounding up to page size, the actual memory footprint is usually
1691 the same.
1692
1693 Say y if you are getting out of memory errors while loading modules
1694
3f22ab27
DH
1695source "mm/Kconfig"
1696
c1b2d970 1697config FORCE_MAX_ZONEORDER
36d6c928 1698 int "Maximum zone order"
898f08e1 1699 default "12" if SOC_AM33XX
6d85e2b0 1700 default "9" if SA1111 || ARCH_EFM32
c1b2d970
MD
1701 default "11"
1702 help
1703 The kernel memory allocator divides physically contiguous memory
1704 blocks into "zones", where each zone is a power of two number of
1705 pages. This option selects the largest power of two that the kernel
1706 keeps in the memory allocator. If you need to allocate very large
1707 blocks of physically contiguous memory, then you may need to
1708 increase this value.
1709
1710 This config option is actually maximum order plus one. For example,
1711 a value of 11 means that the largest free memory block is 2^10 pages.
1712
1da177e4
LT
1713config ALIGNMENT_TRAP
1714 bool
f12d0d7c 1715 depends on CPU_CP15_MMU
1da177e4 1716 default y if !ARCH_EBSA110
e119bfff 1717 select HAVE_PROC_CPU if PROC_FS
1da177e4 1718 help
84eb8d06 1719 ARM processors cannot fetch/store information which is not
1da177e4
LT
1720 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1721 address divisible by 4. On 32-bit ARM processors, these non-aligned
1722 fetch/store instructions will be emulated in software if you say
1723 here, which has a severe performance impact. This is necessary for
1724 correct operation of some network protocols. With an IP-only
1725 configuration it is safe to say N, otherwise say Y.
1726
39ec58f3 1727config UACCESS_WITH_MEMCPY
38ef2ad5
LW
1728 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1729 depends on MMU
39ec58f3
LB
1730 default y if CPU_FEROCEON
1731 help
1732 Implement faster copy_to_user and clear_user methods for CPU
1733 cores where a 8-word STM instruction give significantly higher
1734 memory write throughput than a sequence of individual 32bit stores.
1735
1736 A possible side effect is a slight increase in scheduling latency
1737 between threads sharing the same address space if they invoke
1738 such copy operations with large buffers.
1739
1740 However, if the CPU data cache is using a write-allocate mode,
1741 this option is unlikely to provide any performance gain.
1742
70c70d97
NP
1743config SECCOMP
1744 bool
1745 prompt "Enable seccomp to safely compute untrusted bytecode"
1746 ---help---
1747 This kernel feature is useful for number crunching applications
1748 that may need to compute untrusted bytecode during their
1749 execution. By using pipes or other transports made available to
1750 the process as file descriptors supporting the read/write
1751 syscalls, it's possible to isolate those applications in
1752 their own address space using seccomp. Once seccomp is
1753 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1754 and the task is only allowed to execute a few safe syscalls
1755 defined by each seccomp mode.
1756
06e6295b
SS
1757config SWIOTLB
1758 def_bool y
1759
1760config IOMMU_HELPER
1761 def_bool SWIOTLB
1762
02c2433b
SS
1763config PARAVIRT
1764 bool "Enable paravirtualization code"
1765 help
1766 This changes the kernel so it can modify itself when it is run
1767 under a hypervisor, potentially improving performance significantly
1768 over full virtualization.
1769
1770config PARAVIRT_TIME_ACCOUNTING
1771 bool "Paravirtual steal time accounting"
1772 select PARAVIRT
1773 default n
1774 help
1775 Select this option to enable fine granularity task steal time
1776 accounting. Time spent executing other tasks in parallel with
1777 the current vCPU is discounted from the vCPU power. To account for
1778 that, there can be a small performance impact.
1779
1780 If in doubt, say N here.
1781
eff8d644
SS
1782config XEN_DOM0
1783 def_bool y
1784 depends on XEN
1785
1786config XEN
c2ba1f7d 1787 bool "Xen guest support on ARM"
85323a99 1788 depends on ARM && AEABI && OF
f880b67d 1789 depends on CPU_V7 && !CPU_V6
85323a99 1790 depends on !GENERIC_ATOMIC64
7693decc 1791 depends on MMU
51aaf81f 1792 select ARCH_DMA_ADDR_T_64BIT
17b7ab80 1793 select ARM_PSCI
83862ccf 1794 select SWIOTLB_XEN
02c2433b 1795 select PARAVIRT
eff8d644
SS
1796 help
1797 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1798
1da177e4
LT
1799endmenu
1800
1801menu "Boot options"
1802
9eb8f674
GL
1803config USE_OF
1804 bool "Flattened Device Tree support"
b1b3f49c 1805 select IRQ_DOMAIN
9eb8f674 1806 select OF
9eb8f674
GL
1807 help
1808 Include support for flattened device tree machine descriptions.
1809
bd51e2f5
NP
1810config ATAGS
1811 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1812 default y
1813 help
1814 This is the traditional way of passing data to the kernel at boot
1815 time. If you are solely relying on the flattened device tree (or
1816 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1817 to remove ATAGS support from your kernel binary. If unsure,
1818 leave this to y.
1819
1820config DEPRECATED_PARAM_STRUCT
1821 bool "Provide old way to pass kernel parameters"
1822 depends on ATAGS
1823 help
1824 This was deprecated in 2001 and announced to live on for 5 years.
1825 Some old boot loaders still use this way.
1826
1da177e4
LT
1827# Compressed boot loader in ROM. Yes, we really want to ask about
1828# TEXT and BSS so we preserve their values in the config files.
1829config ZBOOT_ROM_TEXT
1830 hex "Compressed ROM boot loader base address"
1831 default "0"
1832 help
1833 The physical address at which the ROM-able zImage is to be
1834 placed in the target. Platforms which normally make use of
1835 ROM-able zImage formats normally set this to a suitable
1836 value in their defconfig file.
1837
1838 If ZBOOT_ROM is not enabled, this has no effect.
1839
1840config ZBOOT_ROM_BSS
1841 hex "Compressed ROM boot loader BSS address"
1842 default "0"
1843 help
f8c440b2
DF
1844 The base address of an area of read/write memory in the target
1845 for the ROM-able zImage which must be available while the
1846 decompressor is running. It must be large enough to hold the
1847 entire decompressed kernel plus an additional 128 KiB.
1848 Platforms which normally make use of ROM-able zImage formats
1849 normally set this to a suitable value in their defconfig file.
1da177e4
LT
1850
1851 If ZBOOT_ROM is not enabled, this has no effect.
1852
1853config ZBOOT_ROM
1854 bool "Compressed boot loader in ROM/flash"
1855 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
10968131 1856 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1da177e4
LT
1857 help
1858 Say Y here if you intend to execute your compressed kernel image
1859 (zImage) directly from ROM or flash. If unsure, say N.
1860
e2a6a3aa
JB
1861config ARM_APPENDED_DTB
1862 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
10968131 1863 depends on OF
e2a6a3aa
JB
1864 help
1865 With this option, the boot code will look for a device tree binary
1866 (DTB) appended to zImage
1867 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1868
1869 This is meant as a backward compatibility convenience for those
1870 systems with a bootloader that can't be upgraded to accommodate
1871 the documented boot protocol using a device tree.
1872
1873 Beware that there is very little in terms of protection against
1874 this option being confused by leftover garbage in memory that might
1875 look like a DTB header after a reboot if no actual DTB is appended
1876 to zImage. Do not leave this option active in a production kernel
1877 if you don't intend to always append a DTB. Proper passing of the
1878 location into r2 of a bootloader provided DTB is always preferable
1879 to this option.
1880
b90b9a38
NP
1881config ARM_ATAG_DTB_COMPAT
1882 bool "Supplement the appended DTB with traditional ATAG information"
1883 depends on ARM_APPENDED_DTB
1884 help
1885 Some old bootloaders can't be updated to a DTB capable one, yet
1886 they provide ATAGs with memory configuration, the ramdisk address,
1887 the kernel cmdline string, etc. Such information is dynamically
1888 provided by the bootloader and can't always be stored in a static
1889 DTB. To allow a device tree enabled kernel to be used with such
1890 bootloaders, this option allows zImage to extract the information
1891 from the ATAG list and store it at run time into the appended DTB.
1892
d0f34a11
GR
1893choice
1894 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1895 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1896
1897config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1898 bool "Use bootloader kernel arguments if available"
1899 help
1900 Uses the command-line options passed by the boot loader instead of
1901 the device tree bootargs property. If the boot loader doesn't provide
1902 any, the device tree bootargs property will be used.
1903
1904config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1905 bool "Extend with bootloader kernel arguments"
1906 help
1907 The command-line arguments provided by the boot loader will be
1908 appended to the the device tree bootargs property.
1909
1910endchoice
1911
1da177e4
LT
1912config CMDLINE
1913 string "Default kernel command string"
1914 default ""
1915 help
1916 On some architectures (EBSA110 and CATS), there is currently no way
1917 for the boot loader to pass arguments to the kernel. For these
1918 architectures, you should supply some command-line options at build
1919 time by entering them here. As a minimum, you should specify the
1920 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1921
4394c124
VB
1922choice
1923 prompt "Kernel command line type" if CMDLINE != ""
1924 default CMDLINE_FROM_BOOTLOADER
bd51e2f5 1925 depends on ATAGS
4394c124
VB
1926
1927config CMDLINE_FROM_BOOTLOADER
1928 bool "Use bootloader kernel arguments if available"
1929 help
1930 Uses the command-line options passed by the boot loader. If
1931 the boot loader doesn't provide any, the default kernel command
1932 string provided in CMDLINE will be used.
1933
1934config CMDLINE_EXTEND
1935 bool "Extend bootloader kernel arguments"
1936 help
1937 The command-line arguments provided by the boot loader will be
1938 appended to the default kernel command string.
1939
92d2040d
AH
1940config CMDLINE_FORCE
1941 bool "Always use the default kernel command string"
92d2040d
AH
1942 help
1943 Always use the default kernel command string, even if the boot
1944 loader passes other arguments to the kernel.
1945 This is useful if you cannot or don't want to change the
1946 command-line options your boot loader passes to the kernel.
4394c124 1947endchoice
92d2040d 1948
1da177e4
LT
1949config XIP_KERNEL
1950 bool "Kernel Execute-In-Place from ROM"
10968131 1951 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1da177e4
LT
1952 help
1953 Execute-In-Place allows the kernel to run from non-volatile storage
1954 directly addressable by the CPU, such as NOR flash. This saves RAM
1955 space since the text section of the kernel is not loaded from flash
1956 to RAM. Read-write sections, such as the data section and stack,
1957 are still copied to RAM. The XIP kernel is not compressed since
1958 it has to run directly from flash, so it will take more space to
1959 store it. The flash address used to link the kernel object files,
1960 and for storing it, is configuration dependent. Therefore, if you
1961 say Y here, you must know the proper physical address where to
1962 store the kernel image depending on your own flash memory usage.
1963
1964 Also note that the make target becomes "make xipImage" rather than
1965 "make zImage" or "make Image". The final kernel binary to put in
1966 ROM memory will be arch/arm/boot/xipImage.
1967
1968 If unsure, say N.
1969
1970config XIP_PHYS_ADDR
1971 hex "XIP Kernel Physical Location"
1972 depends on XIP_KERNEL
1973 default "0x00080000"
1974 help
1975 This is the physical address in your flash memory the kernel will
1976 be linked for and stored to. This address is dependent on your
1977 own flash usage.
1978
c587e4a6
RP
1979config KEXEC
1980 bool "Kexec system call (EXPERIMENTAL)"
19ab428f 1981 depends on (!SMP || PM_SLEEP_SMP)
cb1293e2 1982 depends on !CPU_V7M
2965faa5 1983 select KEXEC_CORE
c587e4a6
RP
1984 help
1985 kexec is a system call that implements the ability to shutdown your
1986 current kernel, and to start another kernel. It is like a reboot
01dd2fbf 1987 but it is independent of the system firmware. And like a reboot
c587e4a6
RP
1988 you can start any kernel with it, not just Linux.
1989
1990 It is an ongoing process to be certain the hardware in a machine
1991 is properly shutdown, so do not be surprised if this code does not
bf220695 1992 initially work for you.
c587e4a6 1993
4cd9d6f7
RP
1994config ATAGS_PROC
1995 bool "Export atags in procfs"
bd51e2f5 1996 depends on ATAGS && KEXEC
b98d7291 1997 default y
4cd9d6f7
RP
1998 help
1999 Should the atags used to boot the kernel be exported in an "atags"
2000 file in procfs. Useful with kexec.
2001
cb5d39b3
MW
2002config CRASH_DUMP
2003 bool "Build kdump crash kernel (EXPERIMENTAL)"
cb5d39b3
MW
2004 help
2005 Generate crash dump after being started by kexec. This should
2006 be normally only set in special crash dump kernels which are
2007 loaded in the main kernel with kexec-tools into a specially
2008 reserved region and then later executed after a crash by
2009 kdump/kexec. The crash dump kernel must be compiled to a
2010 memory address not used by the main kernel
2011
2012 For more details see Documentation/kdump/kdump.txt
2013
e69edc79
EM
2014config AUTO_ZRELADDR
2015 bool "Auto calculation of the decompressed kernel image address"
e69edc79
EM
2016 help
2017 ZRELADDR is the physical address where the decompressed kernel
2018 image will be placed. If AUTO_ZRELADDR is selected, the address
2019 will be determined at run-time by masking the current IP with
2020 0xf8000000. This assumes the zImage being placed in the first 128MB
2021 from start of memory.
2022
81a0bc39
RF
2023config EFI_STUB
2024 bool
2025
2026config EFI
2027 bool "UEFI runtime support"
2028 depends on OF && !CPU_BIG_ENDIAN && MMU && AUTO_ZRELADDR && !XIP_KERNEL
2029 select UCS2_STRING
2030 select EFI_PARAMS_FROM_FDT
2031 select EFI_STUB
2032 select EFI_ARMSTUB
2033 select EFI_RUNTIME_WRAPPERS
2034 ---help---
2035 This option provides support for runtime services provided
2036 by UEFI firmware (such as non-volatile variables, realtime
2037 clock, and platform reset). A UEFI stub is also provided to
2038 allow the kernel to be booted as an EFI application. This
2039 is only useful for kernels that may run on systems that have
2040 UEFI firmware.
2041
1da177e4
LT
2042endmenu
2043
ac9d7efc 2044menu "CPU Power Management"
1da177e4 2045
1da177e4 2046source "drivers/cpufreq/Kconfig"
1da177e4 2047
ac9d7efc
RK
2048source "drivers/cpuidle/Kconfig"
2049
2050endmenu
2051
1da177e4
LT
2052menu "Floating point emulation"
2053
2054comment "At least one emulation must be selected"
2055
2056config FPE_NWFPE
2057 bool "NWFPE math emulation"
593c252a 2058 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
1da177e4
LT
2059 ---help---
2060 Say Y to include the NWFPE floating point emulator in the kernel.
2061 This is necessary to run most binaries. Linux does not currently
2062 support floating point hardware so you need to say Y here even if
2063 your machine has an FPA or floating point co-processor podule.
2064
2065 You may say N here if you are going to load the Acorn FPEmulator
2066 early in the bootup.
2067
2068config FPE_NWFPE_XP
2069 bool "Support extended precision"
bedf142b 2070 depends on FPE_NWFPE
1da177e4
LT
2071 help
2072 Say Y to include 80-bit support in the kernel floating-point
2073 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2074 Note that gcc does not generate 80-bit operations by default,
2075 so in most cases this option only enlarges the size of the
2076 floating point emulator without any good reason.
2077
2078 You almost surely want to say N here.
2079
2080config FPE_FASTFPE
2081 bool "FastFPE math emulation (EXPERIMENTAL)"
d6f94fa0 2082 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
1da177e4
LT
2083 ---help---
2084 Say Y here to include the FAST floating point emulator in the kernel.
2085 This is an experimental much faster emulator which now also has full
2086 precision for the mantissa. It does not support any exceptions.
2087 It is very simple, and approximately 3-6 times faster than NWFPE.
2088
2089 It should be sufficient for most programs. It may be not suitable
2090 for scientific calculations, but you have to check this for yourself.
2091 If you do not feel you need a faster FP emulation you should better
2092 choose NWFPE.
2093
2094config VFP
2095 bool "VFP-format floating point maths"
e399b1a4 2096 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1da177e4
LT
2097 help
2098 Say Y to include VFP support code in the kernel. This is needed
2099 if your hardware includes a VFP unit.
2100
2101 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2102 release notes and additional status information.
2103
2104 Say N if your target does not have VFP hardware.
2105
25ebee02
CM
2106config VFPv3
2107 bool
2108 depends on VFP
2109 default y if CPU_V7
2110
b5872db4
CM
2111config NEON
2112 bool "Advanced SIMD (NEON) Extension support"
2113 depends on VFPv3 && CPU_V7
2114 help
2115 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2116 Extension.
2117
73c132c1
AB
2118config KERNEL_MODE_NEON
2119 bool "Support for NEON in kernel mode"
c4a30c3b 2120 depends on NEON && AEABI
73c132c1
AB
2121 help
2122 Say Y to include support for NEON in kernel mode.
2123
1da177e4
LT
2124endmenu
2125
2126menu "Userspace binary formats"
2127
2128source "fs/Kconfig.binfmt"
2129
1da177e4
LT
2130endmenu
2131
2132menu "Power management options"
2133
eceab4ac 2134source "kernel/power/Kconfig"
1da177e4 2135
f4cb5700 2136config ARCH_SUSPEND_POSSIBLE
19a0519d 2137 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
f0d75153 2138 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
f4cb5700
JB
2139 def_bool y
2140
15e0d9e3 2141config ARM_CPU_SUSPEND
8b6f2499 2142 def_bool PM_SLEEP || BL_SWITCHER || ARM_PSCI_FW
1b9bdf5c 2143 depends on ARCH_SUSPEND_POSSIBLE
15e0d9e3 2144
603fb42a
SC
2145config ARCH_HIBERNATION_POSSIBLE
2146 bool
2147 depends on MMU
2148 default y if ARCH_SUSPEND_POSSIBLE
2149
1da177e4
LT
2150endmenu
2151
d5950b43
SR
2152source "net/Kconfig"
2153
ac25150f 2154source "drivers/Kconfig"
1da177e4 2155
916f743d
KG
2156source "drivers/firmware/Kconfig"
2157
1da177e4
LT
2158source "fs/Kconfig"
2159
1da177e4
LT
2160source "arch/arm/Kconfig.debug"
2161
2162source "security/Kconfig"
2163
2164source "crypto/Kconfig"
652ccae5
AB
2165if CRYPTO
2166source "arch/arm/crypto/Kconfig"
2167endif
1da177e4
LT
2168
2169source "lib/Kconfig"
749cf76c
CD
2170
2171source "arch/arm/kvm/Kconfig"
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