arm: Add Aspeed machine
[linux-2.6-block.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
8c2ed9bc
JS
778source "arch/arm/mach-aspeed/Kconfig"
779
794d15b2
SS
780source "arch/arm/mach-mv78xx0/Kconfig"
781
3995eb82 782source "arch/arm/mach-imx/Kconfig"
1da177e4 783
f682a218
MB
784source "arch/arm/mach-mediatek/Kconfig"
785
1d3f33d5
SG
786source "arch/arm/mach-mxs/Kconfig"
787
95b8f20f 788source "arch/arm/mach-netx/Kconfig"
49cbe786 789
95b8f20f 790source "arch/arm/mach-nomadik/Kconfig"
95b8f20f 791
9851ca57
DT
792source "arch/arm/mach-nspire/Kconfig"
793
d48af15e
TL
794source "arch/arm/plat-omap/Kconfig"
795
796source "arch/arm/mach-omap1/Kconfig"
1da177e4 797
1dbae815
TL
798source "arch/arm/mach-omap2/Kconfig"
799
9dd0b194 800source "arch/arm/mach-orion5x/Kconfig"
585cf175 801
387798b3
RH
802source "arch/arm/mach-picoxcell/Kconfig"
803
95b8f20f
RK
804source "arch/arm/mach-pxa/Kconfig"
805source "arch/arm/plat-pxa/Kconfig"
585cf175 806
95b8f20f
RK
807source "arch/arm/mach-mmp/Kconfig"
808
8fc1b0f8
KG
809source "arch/arm/mach-qcom/Kconfig"
810
95b8f20f
RK
811source "arch/arm/mach-realview/Kconfig"
812
d63dc051
HS
813source "arch/arm/mach-rockchip/Kconfig"
814
95b8f20f 815source "arch/arm/mach-sa1100/Kconfig"
edabd38e 816
387798b3
RH
817source "arch/arm/mach-socfpga/Kconfig"
818
a7ed099f 819source "arch/arm/mach-spear/Kconfig"
a21765a7 820
65ebcc11
SK
821source "arch/arm/mach-sti/Kconfig"
822
85fd6d63 823source "arch/arm/mach-s3c24xx/Kconfig"
1da177e4 824
431107ea 825source "arch/arm/mach-s3c64xx/Kconfig"
a08ab637 826
170f4e42
KK
827source "arch/arm/mach-s5pv210/Kconfig"
828
83014579 829source "arch/arm/mach-exynos/Kconfig"
e509b289 830source "arch/arm/plat-samsung/Kconfig"
cc0e72b8 831
882d01f9 832source "arch/arm/mach-shmobile/Kconfig"
52c543f9 833
3b52634f
MR
834source "arch/arm/mach-sunxi/Kconfig"
835
156a0997
BS
836source "arch/arm/mach-prima2/Kconfig"
837
d6de5b02
MG
838source "arch/arm/mach-tango/Kconfig"
839
c5f80065
EG
840source "arch/arm/mach-tegra/Kconfig"
841
95b8f20f 842source "arch/arm/mach-u300/Kconfig"
1da177e4 843
ba56a987
MY
844source "arch/arm/mach-uniphier/Kconfig"
845
95b8f20f 846source "arch/arm/mach-ux500/Kconfig"
1da177e4
LT
847
848source "arch/arm/mach-versatile/Kconfig"
849
ceade897 850source "arch/arm/mach-vexpress/Kconfig"
420c34e4 851source "arch/arm/plat-versatile/Kconfig"
ceade897 852
6f35f9a9
TP
853source "arch/arm/mach-vt8500/Kconfig"
854
7ec80ddf 855source "arch/arm/mach-w90x900/Kconfig"
856
acede515
JN
857source "arch/arm/mach-zx/Kconfig"
858
9a45eb69
JC
859source "arch/arm/mach-zynq/Kconfig"
860
499f1640
SA
861# ARMv7-M architecture
862config ARCH_EFM32
863 bool "Energy Micro efm32"
864 depends on ARM_SINGLE_ARMV7M
865 select ARCH_REQUIRE_GPIOLIB
866 help
867 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
868 processors.
869
870config ARCH_LPC18XX
871 bool "NXP LPC18xx/LPC43xx"
872 depends on ARM_SINGLE_ARMV7M
873 select ARCH_HAS_RESET_CONTROLLER
874 select ARM_AMBA
875 select CLKSRC_LPC32XX
876 select PINCTRL
877 help
878 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4
879 high performance microcontrollers.
880
881config ARCH_STM32
882 bool "STMicrolectronics STM32"
883 depends on ARM_SINGLE_ARMV7M
884 select ARCH_HAS_RESET_CONTROLLER
885 select ARMV7M_SYSTICK
25263186 886 select CLKSRC_STM32
f64e9804 887 select PINCTRL
499f1640
SA
888 select RESET_CONTROLLER
889 help
890 Support for STMicroelectronics STM32 processors.
891
fa65fc6b
MC
892config MACH_STM32F429
893 bool "STMicrolectronics STM32F429"
894 depends on ARCH_STM32
895 default y
896
1da177e4
LT
897# Definitions to make life easier
898config ARCH_ACORN
899 bool
900
7ae1f7ec
LB
901config PLAT_IOP
902 bool
469d3044 903 select GENERIC_CLOCKEVENTS
7ae1f7ec 904
69b02f6a
LB
905config PLAT_ORION
906 bool
bfe45e0b 907 select CLKSRC_MMIO
b1b3f49c 908 select COMMON_CLK
dc7ad3b3 909 select GENERIC_IRQ_CHIP
278b45b0 910 select IRQ_DOMAIN
69b02f6a 911
abcda1dc
TP
912config PLAT_ORION_LEGACY
913 bool
914 select PLAT_ORION
915
bd5ce433
EM
916config PLAT_PXA
917 bool
918
f4b8b319
RK
919config PLAT_VERSATILE
920 bool
921
d9a1beaa
AC
922source "arch/arm/firmware/Kconfig"
923
1da177e4
LT
924source arch/arm/mm/Kconfig
925
afe4b25e 926config IWMMXT
d93003e8
SH
927 bool "Enable iWMMXt support"
928 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
929 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
afe4b25e
LB
930 help
931 Enable support for iWMMXt context switching at run time if
932 running on a CPU that supports it.
933
52108641 934config MULTI_IRQ_HANDLER
935 bool
936 help
937 Allow each machine to specify it's own IRQ handler at run time.
938
3b93e7b0
HC
939if !MMU
940source "arch/arm/Kconfig-nommu"
941endif
942
3e0a07f8
GC
943config PJ4B_ERRATA_4742
944 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
945 depends on CPU_PJ4B && MACH_ARMADA_370
946 default y
947 help
948 When coming out of either a Wait for Interrupt (WFI) or a Wait for
949 Event (WFE) IDLE states, a specific timing sensitivity exists between
950 the retiring WFI/WFE instructions and the newly issued subsequent
951 instructions. This sensitivity can result in a CPU hang scenario.
952 Workaround:
953 The software must insert either a Data Synchronization Barrier (DSB)
954 or Data Memory Barrier (DMB) command immediately after the WFI/WFE
955 instruction
956
f0c4b8d6
WD
957config ARM_ERRATA_326103
958 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
959 depends on CPU_V6
960 help
961 Executing a SWP instruction to read-only memory does not set bit 11
962 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
963 treat the access as a read, preventing a COW from occurring and
964 causing the faulting task to livelock.
965
9cba3ccc
CM
966config ARM_ERRATA_411920
967 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
e399b1a4 968 depends on CPU_V6 || CPU_V6K
9cba3ccc
CM
969 help
970 Invalidation of the Instruction Cache operation can
971 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
972 It does not affect the MPCore. This option enables the ARM Ltd.
973 recommended workaround.
974
7ce236fc
CM
975config ARM_ERRATA_430973
976 bool "ARM errata: Stale prediction on replaced interworking branch"
977 depends on CPU_V7
978 help
979 This option enables the workaround for the 430973 Cortex-A8
79403cda 980 r1p* erratum. If a code sequence containing an ARM/Thumb
7ce236fc
CM
981 interworking branch is replaced with another code sequence at the
982 same virtual address, whether due to self-modifying code or virtual
983 to physical address re-mapping, Cortex-A8 does not recover from the
984 stale interworking branch prediction. This results in Cortex-A8
985 executing the new code sequence in the incorrect ARM or Thumb state.
986 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
987 and also flushes the branch target cache at every context switch.
988 Note that setting specific bits in the ACTLR register may not be
989 available in non-secure mode.
990
855c551f
CM
991config ARM_ERRATA_458693
992 bool "ARM errata: Processor deadlock when a false hazard is created"
993 depends on CPU_V7
62e4d357 994 depends on !ARCH_MULTIPLATFORM
855c551f
CM
995 help
996 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
997 erratum. For very specific sequences of memory operations, it is
998 possible for a hazard condition intended for a cache line to instead
999 be incorrectly associated with a different cache line. This false
1000 hazard might then cause a processor deadlock. The workaround enables
1001 the L1 caching of the NEON accesses and disables the PLD instruction
1002 in the ACTLR register. Note that setting specific bits in the ACTLR
1003 register may not be available in non-secure mode.
1004
0516e464
CM
1005config ARM_ERRATA_460075
1006 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1007 depends on CPU_V7
62e4d357 1008 depends on !ARCH_MULTIPLATFORM
0516e464
CM
1009 help
1010 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1011 erratum. Any asynchronous access to the L2 cache may encounter a
1012 situation in which recent store transactions to the L2 cache are lost
1013 and overwritten with stale memory contents from external memory. The
1014 workaround disables the write-allocate mode for the L2 cache via the
1015 ACTLR register. Note that setting specific bits in the ACTLR register
1016 may not be available in non-secure mode.
1017
9f05027c
WD
1018config ARM_ERRATA_742230
1019 bool "ARM errata: DMB operation may be faulty"
1020 depends on CPU_V7 && SMP
62e4d357 1021 depends on !ARCH_MULTIPLATFORM
9f05027c
WD
1022 help
1023 This option enables the workaround for the 742230 Cortex-A9
1024 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
1025 between two write operations may not ensure the correct visibility
1026 ordering of the two writes. This workaround sets a specific bit in
1027 the diagnostic register of the Cortex-A9 which causes the DMB
1028 instruction to behave as a DSB, ensuring the correct behaviour of
1029 the two writes.
1030
a672e99b
WD
1031config ARM_ERRATA_742231
1032 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
1033 depends on CPU_V7 && SMP
62e4d357 1034 depends on !ARCH_MULTIPLATFORM
a672e99b
WD
1035 help
1036 This option enables the workaround for the 742231 Cortex-A9
1037 (r2p0..r2p2) erratum. Under certain conditions, specific to the
1038 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
1039 accessing some data located in the same cache line, may get corrupted
1040 data due to bad handling of the address hazard when the line gets
1041 replaced from one of the CPUs at the same time as another CPU is
1042 accessing it. This workaround sets specific bits in the diagnostic
1043 register of the Cortex-A9 which reduces the linefill issuing
1044 capabilities of the processor.
1045
69155794
JM
1046config ARM_ERRATA_643719
1047 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
1048 depends on CPU_V7 && SMP
e5a5de44 1049 default y
69155794
JM
1050 help
1051 This option enables the workaround for the 643719 Cortex-A9 (prior to
1052 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
1053 register returns zero when it should return one. The workaround
1054 corrects this value, ensuring cache maintenance operations which use
1055 it behave as intended and avoiding data corruption.
1056
cdf357f1
WD
1057config ARM_ERRATA_720789
1058 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
e66dc745 1059 depends on CPU_V7
cdf357f1
WD
1060 help
1061 This option enables the workaround for the 720789 Cortex-A9 (prior to
1062 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1063 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1064 As a consequence of this erratum, some TLB entries which should be
1065 invalidated are not, resulting in an incoherency in the system page
1066 tables. The workaround changes the TLB flushing routines to invalidate
1067 entries regardless of the ASID.
475d92fc
WD
1068
1069config ARM_ERRATA_743622
1070 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
1071 depends on CPU_V7
62e4d357 1072 depends on !ARCH_MULTIPLATFORM
475d92fc
WD
1073 help
1074 This option enables the workaround for the 743622 Cortex-A9
efbc74ac 1075 (r2p*) erratum. Under very rare conditions, a faulty
475d92fc
WD
1076 optimisation in the Cortex-A9 Store Buffer may lead to data
1077 corruption. This workaround sets a specific bit in the diagnostic
1078 register of the Cortex-A9 which disables the Store Buffer
1079 optimisation, preventing the defect from occurring. This has no
1080 visible impact on the overall performance or power consumption of the
1081 processor.
1082
9a27c27c
WD
1083config ARM_ERRATA_751472
1084 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
ba90c516 1085 depends on CPU_V7
62e4d357 1086 depends on !ARCH_MULTIPLATFORM
9a27c27c
WD
1087 help
1088 This option enables the workaround for the 751472 Cortex-A9 (prior
1089 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
1090 completion of a following broadcasted operation if the second
1091 operation is received by a CPU before the ICIALLUIS has completed,
1092 potentially leading to corrupted entries in the cache or TLB.
1093
fcbdc5fe
WD
1094config ARM_ERRATA_754322
1095 bool "ARM errata: possible faulty MMU translations following an ASID switch"
1096 depends on CPU_V7
1097 help
1098 This option enables the workaround for the 754322 Cortex-A9 (r2p*,
1099 r3p*) erratum. A speculative memory access may cause a page table walk
1100 which starts prior to an ASID switch but completes afterwards. This
1101 can populate the micro-TLB with a stale entry which may be hit with
1102 the new ASID. This workaround places two dsb instructions in the mm
1103 switching code so that no page table walks can cross the ASID switch.
1104
5dab26af
WD
1105config ARM_ERRATA_754327
1106 bool "ARM errata: no automatic Store Buffer drain"
1107 depends on CPU_V7 && SMP
1108 help
1109 This option enables the workaround for the 754327 Cortex-A9 (prior to
1110 r2p0) erratum. The Store Buffer does not have any automatic draining
1111 mechanism and therefore a livelock may occur if an external agent
1112 continuously polls a memory location waiting to observe an update.
1113 This workaround defines cpu_relax() as smp_mb(), preventing correctly
1114 written polling loops from denying visibility of updates to memory.
1115
145e10e1
CM
1116config ARM_ERRATA_364296
1117 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
fd832478 1118 depends on CPU_V6
145e10e1
CM
1119 help
1120 This options enables the workaround for the 364296 ARM1136
1121 r0p2 erratum (possible cache data corruption with
1122 hit-under-miss enabled). It sets the undocumented bit 31 in
1123 the auxiliary control register and the FI bit in the control
1124 register, thus disabling hit-under-miss without putting the
1125 processor into full low interrupt latency mode. ARM11MPCore
1126 is not affected.
1127
f630c1bd
WD
1128config ARM_ERRATA_764369
1129 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
1130 depends on CPU_V7 && SMP
1131 help
1132 This option enables the workaround for erratum 764369
1133 affecting Cortex-A9 MPCore with two or more processors (all
1134 current revisions). Under certain timing circumstances, a data
1135 cache line maintenance operation by MVA targeting an Inner
1136 Shareable memory region may fail to proceed up to either the
1137 Point of Coherency or to the Point of Unification of the
1138 system. This workaround adds a DSB instruction before the
1139 relevant cache maintenance functions and sets a specific bit
1140 in the diagnostic control register of the SCU.
1141
7253b85c
SH
1142config ARM_ERRATA_775420
1143 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
1144 depends on CPU_V7
1145 help
1146 This option enables the workaround for the 775420 Cortex-A9 (r2p2,
1147 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
1148 operation aborts with MMU exception, it might cause the processor
1149 to deadlock. This workaround puts DSB before executing ISB if
1150 an abort may occur on cache maintenance.
1151
93dc6887
CM
1152config ARM_ERRATA_798181
1153 bool "ARM errata: TLBI/DSB failure on Cortex-A15"
1154 depends on CPU_V7 && SMP
1155 help
1156 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
1157 adequately shooting down all use of the old entries. This
1158 option enables the Linux kernel workaround for this erratum
1159 which sends an IPI to the CPUs that are running the same ASID
1160 as the one being invalidated.
1161
84b6504f
WD
1162config ARM_ERRATA_773022
1163 bool "ARM errata: incorrect instructions may be executed from loop buffer"
1164 depends on CPU_V7
1165 help
1166 This option enables the workaround for the 773022 Cortex-A15
1167 (up to r0p4) erratum. In certain rare sequences of code, the
1168 loop buffer may deliver incorrect instructions. This
1169 workaround disables the loop buffer to avoid the erratum.
1170
1da177e4
LT
1171endmenu
1172
1173source "arch/arm/common/Kconfig"
1174
1da177e4
LT
1175menu "Bus support"
1176
1da177e4
LT
1177config ISA
1178 bool
1da177e4
LT
1179 help
1180 Find out whether you have ISA slots on your motherboard. ISA is the
1181 name of a bus system, i.e. the way the CPU talks to the other stuff
1182 inside your box. Other bus systems are PCI, EISA, MicroChannel
1183 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1184 newer boards don't support it. If you have ISA, say Y, otherwise N.
1185
065909b9 1186# Select ISA DMA controller support
1da177e4
LT
1187config ISA_DMA
1188 bool
065909b9 1189 select ISA_DMA_API
1da177e4 1190
065909b9 1191# Select ISA DMA interface
5cae841b
AV
1192config ISA_DMA_API
1193 bool
5cae841b 1194
1da177e4 1195config PCI
0b05da72 1196 bool "PCI support" if MIGHT_HAVE_PCI
1da177e4
LT
1197 help
1198 Find out whether you have a PCI motherboard. PCI is the name of a
1199 bus system, i.e. the way the CPU talks to the other stuff inside
1200 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1201 VESA. If you have PCI, say Y, otherwise N.
1202
52882173
AV
1203config PCI_DOMAINS
1204 bool
1205 depends on PCI
1206
8c7d1474
LP
1207config PCI_DOMAINS_GENERIC
1208 def_bool PCI_DOMAINS
1209
b080ac8a
MRJ
1210config PCI_NANOENGINE
1211 bool "BSE nanoEngine PCI support"
1212 depends on SA1100_NANOENGINE
1213 help
1214 Enable PCI on the BSE nanoEngine board.
1215
36e23590
MW
1216config PCI_SYSCALL
1217 def_bool PCI
1218
a0113a99
MR
1219config PCI_HOST_ITE8152
1220 bool
1221 depends on PCI && MACH_ARMCORE
1222 default y
1223 select DMABOUNCE
1224
1da177e4
LT
1225source "drivers/pci/Kconfig"
1226
1227source "drivers/pcmcia/Kconfig"
1228
1229endmenu
1230
1231menu "Kernel Features"
1232
3b55658a
DM
1233config HAVE_SMP
1234 bool
1235 help
1236 This option should be selected by machines which have an SMP-
1237 capable CPU.
1238
1239 The only effect of this option is to make the SMP-related
1240 options available to the user for configuration.
1241
1da177e4 1242config SMP
bb2d8130 1243 bool "Symmetric Multi-Processing"
fbb4ddac 1244 depends on CPU_V6K || CPU_V7
bc28248e 1245 depends on GENERIC_CLOCKEVENTS
3b55658a 1246 depends on HAVE_SMP
801bb21c 1247 depends on MMU || ARM_MPU
0361748f 1248 select IRQ_WORK
1da177e4
LT
1249 help
1250 This enables support for systems with more than one CPU. If you have
4a474157
RG
1251 a system with only one CPU, say N. If you have a system with more
1252 than one CPU, say Y.
1da177e4 1253
4a474157 1254 If you say N here, the kernel will run on uni- and multiprocessor
1da177e4 1255 machines, but will use only one CPU of a multiprocessor machine. If
4a474157
RG
1256 you say Y here, the kernel will run on many, but not all,
1257 uniprocessor machines. On a uniprocessor machine, the kernel
1258 will run faster if you say N here.
1da177e4 1259
395cf969 1260 See also <file:Documentation/x86/i386/IO-APIC.txt>,
1da177e4 1261 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
50a23e6e 1262 <http://tldp.org/HOWTO/SMP-HOWTO.html>.
1da177e4
LT
1263
1264 If you don't know what to do here, say N.
1265
f00ec48f 1266config SMP_ON_UP
5744ff43 1267 bool "Allow booting SMP kernel on uniprocessor systems"
801bb21c 1268 depends on SMP && !XIP_KERNEL && MMU
f00ec48f
RK
1269 default y
1270 help
1271 SMP kernels contain instructions which fail on non-SMP processors.
1272 Enabling this option allows the kernel to modify itself to make
1273 these instructions safe. Disabling it allows about 1K of space
1274 savings.
1275
1276 If you don't know what to do here, say Y.
1277
c9018aab
VG
1278config ARM_CPU_TOPOLOGY
1279 bool "Support cpu topology definition"
1280 depends on SMP && CPU_V7
1281 default y
1282 help
1283 Support ARM cpu topology definition. The MPIDR register defines
1284 affinity between processors which is then used to describe the cpu
1285 topology of an ARM System.
1286
1287config SCHED_MC
1288 bool "Multi-core scheduler support"
1289 depends on ARM_CPU_TOPOLOGY
1290 help
1291 Multi-core scheduler support improves the CPU scheduler's decision
1292 making when dealing with multi-core CPU chips at a cost of slightly
1293 increased overhead in some places. If unsure say N here.
1294
1295config SCHED_SMT
1296 bool "SMT scheduler support"
1297 depends on ARM_CPU_TOPOLOGY
1298 help
1299 Improves the CPU scheduler's decision making when dealing with
1300 MultiThreading at a cost of slightly increased overhead in some
1301 places. If unsure say N here.
1302
a8cbcd92
RK
1303config HAVE_ARM_SCU
1304 bool
a8cbcd92
RK
1305 help
1306 This option enables support for the ARM system coherency unit
1307
8a4da6e3 1308config HAVE_ARM_ARCH_TIMER
022c03a2
MZ
1309 bool "Architected timer support"
1310 depends on CPU_V7
8a4da6e3 1311 select ARM_ARCH_TIMER
0c403462 1312 select GENERIC_CLOCKEVENTS
022c03a2
MZ
1313 help
1314 This option enables support for the ARM architected timer
1315
f32f4ce2
RK
1316config HAVE_ARM_TWD
1317 bool
da4a686a 1318 select CLKSRC_OF if OF
f32f4ce2
RK
1319 help
1320 This options enables support for the ARM timer and watchdog unit
1321
e8db288e
NP
1322config MCPM
1323 bool "Multi-Cluster Power Management"
1324 depends on CPU_V7 && SMP
1325 help
1326 This option provides the common power management infrastructure
1327 for (multi-)cluster based systems, such as big.LITTLE based
1328 systems.
1329
ebf4a5c5
HZ
1330config MCPM_QUAD_CLUSTER
1331 bool
1332 depends on MCPM
1333 help
1334 To avoid wasting resources unnecessarily, MCPM only supports up
1335 to 2 clusters by default.
1336 Platforms with 3 or 4 clusters that use MCPM must select this
1337 option to allow the additional clusters to be managed.
1338
1c33be57
NP
1339config BIG_LITTLE
1340 bool "big.LITTLE support (Experimental)"
1341 depends on CPU_V7 && SMP
1342 select MCPM
1343 help
1344 This option enables support selections for the big.LITTLE
1345 system architecture.
1346
1347config BL_SWITCHER
1348 bool "big.LITTLE switcher support"
6c044fec 1349 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU && ARM_GIC
51aaf81f 1350 select CPU_PM
1c33be57
NP
1351 help
1352 The big.LITTLE "switcher" provides the core functionality to
1353 transparently handle transition between a cluster of A15's
1354 and a cluster of A7's in a big.LITTLE system.
1355
b22537c6
NP
1356config BL_SWITCHER_DUMMY_IF
1357 tristate "Simple big.LITTLE switcher user interface"
1358 depends on BL_SWITCHER && DEBUG_KERNEL
1359 help
1360 This is a simple and dummy char dev interface to control
1361 the big.LITTLE switcher core code. It is meant for
1362 debugging purposes only.
1363
8d5796d2
LB
1364choice
1365 prompt "Memory split"
006fa259 1366 depends on MMU
8d5796d2
LB
1367 default VMSPLIT_3G
1368 help
1369 Select the desired split between kernel and user memory.
1370
1371 If you are not absolutely sure what you are doing, leave this
1372 option alone!
1373
1374 config VMSPLIT_3G
1375 bool "3G/1G user/kernel split"
63ce446c
NP
1376 config VMSPLIT_3G_OPT
1377 bool "3G/1G user/kernel split (for full 1G low memory)"
8d5796d2
LB
1378 config VMSPLIT_2G
1379 bool "2G/2G user/kernel split"
1380 config VMSPLIT_1G
1381 bool "1G/3G user/kernel split"
1382endchoice
1383
1384config PAGE_OFFSET
1385 hex
006fa259 1386 default PHYS_OFFSET if !MMU
8d5796d2
LB
1387 default 0x40000000 if VMSPLIT_1G
1388 default 0x80000000 if VMSPLIT_2G
63ce446c 1389 default 0xB0000000 if VMSPLIT_3G_OPT
8d5796d2
LB
1390 default 0xC0000000
1391
1da177e4
LT
1392config NR_CPUS
1393 int "Maximum number of CPUs (2-32)"
1394 range 2 32
1395 depends on SMP
1396 default "4"
1397
a054a811 1398config HOTPLUG_CPU
00b7dede 1399 bool "Support for hot-pluggable CPUs"
40b31360 1400 depends on SMP
a054a811
RK
1401 help
1402 Say Y here to experiment with turning CPUs off and on. CPUs
1403 can be controlled through /sys/devices/system/cpu.
1404
2bdd424f
WD
1405config ARM_PSCI
1406 bool "Support for the ARM Power State Coordination Interface (PSCI)"
e679660d 1407 depends on HAVE_ARM_SMCCC
be120397 1408 select ARM_PSCI_FW
2bdd424f
WD
1409 help
1410 Say Y here if you want Linux to communicate with system firmware
1411 implementing the PSCI specification for CPU-centric power
1412 management operations described in ARM document number ARM DEN
1413 0022A ("Power State Coordination Interface System Software on
1414 ARM processors").
1415
2a6ad871
MR
1416# The GPIO number here must be sorted by descending number. In case of
1417# a multiplatform kernel, we just want the highest value required by the
1418# selected platforms.
44986ab0
PDSN
1419config ARCH_NR_GPIO
1420 int
b35d2e56
GF
1421 default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \
1422 ARCH_ZYNQ
aa42587a
TF
1423 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
1424 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
eb171a99 1425 default 416 if ARCH_SUNXI
06b851e5 1426 default 392 if ARCH_U8500
01bb914c 1427 default 352 if ARCH_VT8500
7b5da4c3 1428 default 288 if ARCH_ROCKCHIP
2a6ad871 1429 default 264 if MACH_H4700
44986ab0
PDSN
1430 default 0
1431 help
1432 Maximum number of GPIOs in the system.
1433
1434 If unsure, leave the default value.
1435
d45a398f 1436source kernel/Kconfig.preempt
1da177e4 1437
c9218b16 1438config HZ_FIXED
f8065813 1439 int
070b8b43 1440 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
a73ddc61 1441 ARCH_S5PV210 || ARCH_EXYNOS4
1164f672 1442 default 128 if SOC_AT91RM9200
47d84682 1443 default 0
c9218b16
RK
1444
1445choice
47d84682 1446 depends on HZ_FIXED = 0
c9218b16
RK
1447 prompt "Timer frequency"
1448
1449config HZ_100
1450 bool "100 Hz"
1451
1452config HZ_200
1453 bool "200 Hz"
1454
1455config HZ_250
1456 bool "250 Hz"
1457
1458config HZ_300
1459 bool "300 Hz"
1460
1461config HZ_500
1462 bool "500 Hz"
1463
1464config HZ_1000
1465 bool "1000 Hz"
1466
1467endchoice
1468
1469config HZ
1470 int
47d84682 1471 default HZ_FIXED if HZ_FIXED != 0
c9218b16
RK
1472 default 100 if HZ_100
1473 default 200 if HZ_200
1474 default 250 if HZ_250
1475 default 300 if HZ_300
1476 default 500 if HZ_500
1477 default 1000
1478
1479config SCHED_HRTICK
1480 def_bool HIGH_RES_TIMERS
f8065813 1481
16c79651 1482config THUMB2_KERNEL
bc7dea00 1483 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
4477ca45 1484 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
bc7dea00 1485 default y if CPU_THUMBONLY
16c79651
CM
1486 select AEABI
1487 select ARM_ASM_UNIFIED
89bace65 1488 select ARM_UNWIND
16c79651
CM
1489 help
1490 By enabling this option, the kernel will be compiled in
1491 Thumb-2 mode. A compiler/assembler that understand the unified
1492 ARM-Thumb syntax is needed.
1493
1494 If unsure, say N.
1495
6f685c5c
DM
1496config THUMB2_AVOID_R_ARM_THM_JUMP11
1497 bool "Work around buggy Thumb-2 short branch relocations in gas"
1498 depends on THUMB2_KERNEL && MODULES
1499 default y
1500 help
1501 Various binutils versions can resolve Thumb-2 branches to
1502 locally-defined, preemptible global symbols as short-range "b.n"
1503 branch instructions.
1504
1505 This is a problem, because there's no guarantee the final
1506 destination of the symbol, or any candidate locations for a
1507 trampoline, are within range of the branch. For this reason, the
1508 kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
1509 relocation in modules at all, and it makes little sense to add
1510 support.
1511
1512 The symptom is that the kernel fails with an "unsupported
1513 relocation" error when loading some modules.
1514
1515 Until fixed tools are available, passing
1516 -fno-optimize-sibling-calls to gcc should prevent gcc generating
1517 code which hits this problem, at the cost of a bit of extra runtime
1518 stack usage in some cases.
1519
1520 The problem is described in more detail at:
1521 https://bugs.launchpad.net/binutils-linaro/+bug/725126
1522
1523 Only Thumb-2 kernels are affected.
1524
1525 Unless you are sure your tools don't have this problem, say Y.
1526
0becb088
CM
1527config ARM_ASM_UNIFIED
1528 bool
1529
42f25bdd
NP
1530config ARM_PATCH_IDIV
1531 bool "Runtime patch udiv/sdiv instructions into __aeabi_{u}idiv()"
1532 depends on CPU_32v7 && !XIP_KERNEL
1533 default y
1534 help
1535 The ARM compiler inserts calls to __aeabi_idiv() and
1536 __aeabi_uidiv() when it needs to perform division on signed
1537 and unsigned integers. Some v7 CPUs have support for the sdiv
1538 and udiv instructions that can be used to implement those
1539 functions.
1540
1541 Enabling this option allows the kernel to modify itself to
1542 replace the first two instructions of these library functions
1543 with the sdiv or udiv plus "bx lr" instructions when the CPU
1544 it is running on supports them. Typically this will be faster
1545 and less power intensive than running the original library
1546 code to do integer division.
1547
704bdda0
NP
1548config AEABI
1549 bool "Use the ARM EABI to compile the kernel"
1550 help
1551 This option allows for the kernel to be compiled using the latest
1552 ARM ABI (aka EABI). This is only useful if you are using a user
1553 space environment that is also compiled with EABI.
1554
1555 Since there are major incompatibilities between the legacy ABI and
1556 EABI, especially with regard to structure member alignment, this
1557 option also changes the kernel syscall calling convention to
1558 disambiguate both ABIs and allow for backward compatibility support
1559 (selected with CONFIG_OABI_COMPAT).
1560
1561 To use this you need GCC version 4.0.0 or later.
1562
6c90c872 1563config OABI_COMPAT
a73a3ff1 1564 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
d6f94fa0 1565 depends on AEABI && !THUMB2_KERNEL
6c90c872
NP
1566 help
1567 This option preserves the old syscall interface along with the
1568 new (ARM EABI) one. It also provides a compatibility layer to
1569 intercept syscalls that have structure arguments which layout
1570 in memory differs between the legacy ABI and the new ARM EABI
1571 (only for non "thumb" binaries). This option adds a tiny
1572 overhead to all syscalls and produces a slightly larger kernel.
91702175
KC
1573
1574 The seccomp filter system will not be available when this is
1575 selected, since there is no way yet to sensibly distinguish
1576 between calling conventions during filtering.
1577
6c90c872
NP
1578 If you know you'll be using only pure EABI user space then you
1579 can say N here. If this option is not selected and you attempt
1580 to execute a legacy ABI binary then the result will be
1581 UNPREDICTABLE (in fact it can be predicted that it won't work
b02f8467 1582 at all). If in doubt say N.
6c90c872 1583
eb33575c 1584config ARCH_HAS_HOLES_MEMORYMODEL
e80d6a24 1585 bool
e80d6a24 1586
05944d74
RK
1587config ARCH_SPARSEMEM_ENABLE
1588 bool
1589
07a2f737
RK
1590config ARCH_SPARSEMEM_DEFAULT
1591 def_bool ARCH_SPARSEMEM_ENABLE
1592
05944d74 1593config ARCH_SELECT_MEMORY_MODEL
be370302 1594 def_bool ARCH_SPARSEMEM_ENABLE
c80d79d7 1595
7b7bf499
WD
1596config HAVE_ARCH_PFN_VALID
1597 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
1598
b8cd51af
SC
1599config HAVE_GENERIC_RCU_GUP
1600 def_bool y
1601 depends on ARM_LPAE
1602
053a96ca 1603config HIGHMEM
e8db89a2
RK
1604 bool "High Memory Support"
1605 depends on MMU
053a96ca
NP
1606 help
1607 The address space of ARM processors is only 4 Gigabytes large
1608 and it has to accommodate user address space, kernel address
1609 space as well as some memory mapped IO. That means that, if you
1610 have a large amount of physical memory and/or IO, not all of the
1611 memory can be "permanently mapped" by the kernel. The physical
1612 memory that is not permanently mapped is called "high memory".
1613
1614 Depending on the selected kernel/user memory split, minimum
1615 vmalloc space and actual amount of RAM, you may not need this
1616 option which should result in a slightly faster kernel.
1617
1618 If unsure, say n.
1619
65cec8e3 1620config HIGHPTE
9a431bd5 1621 bool "Allocate 2nd-level pagetables from highmem" if EXPERT
65cec8e3 1622 depends on HIGHMEM
9a431bd5 1623 default y
b4d103d1
RK
1624 help
1625 The VM uses one page of physical memory for each page table.
1626 For systems with a lot of processes, this can use a lot of
1627 precious low memory, eventually leading to low memory being
1628 consumed by page tables. Setting this option will allow
1629 user-space 2nd level page tables to reside in high memory.
65cec8e3 1630
a5e090ac
RK
1631config CPU_SW_DOMAIN_PAN
1632 bool "Enable use of CPU domains to implement privileged no-access"
1633 depends on MMU && !ARM_LPAE
1b8873a0
JI
1634 default y
1635 help
a5e090ac
RK
1636 Increase kernel security by ensuring that normal kernel accesses
1637 are unable to access userspace addresses. This can help prevent
1638 use-after-free bugs becoming an exploitable privilege escalation
1639 by ensuring that magic values (such as LIST_POISON) will always
1640 fault when dereferenced.
1641
1642 CPUs with low-vector mappings use a best-efforts implementation.
1643 Their lower 1MB needs to remain accessible for the vectors, but
1644 the remainder of userspace will become appropriately inaccessible.
65cec8e3 1645
1b8873a0 1646config HW_PERF_EVENTS
fa8ad788
MR
1647 def_bool y
1648 depends on ARM_PMU
1b8873a0 1649
1355e2a6
CM
1650config SYS_SUPPORTS_HUGETLBFS
1651 def_bool y
1652 depends on ARM_LPAE
1653
8d962507
CM
1654config HAVE_ARCH_TRANSPARENT_HUGEPAGE
1655 def_bool y
1656 depends on ARM_LPAE
1657
4bfab203
SC
1658config ARCH_WANT_GENERAL_HUGETLB
1659 def_bool y
1660
7d485f64
AB
1661config ARM_MODULE_PLTS
1662 bool "Use PLTs to allow module memory to spill over into vmalloc area"
1663 depends on MODULES
1664 help
1665 Allocate PLTs when loading modules so that jumps and calls whose
1666 targets are too far away for their relative offsets to be encoded
1667 in the instructions themselves can be bounced via veneers in the
1668 module's PLT. This allows modules to be allocated in the generic
1669 vmalloc area after the dedicated module memory area has been
1670 exhausted. The modules will use slightly more memory, but after
1671 rounding up to page size, the actual memory footprint is usually
1672 the same.
1673
1674 Say y if you are getting out of memory errors while loading modules
1675
3f22ab27
DH
1676source "mm/Kconfig"
1677
c1b2d970 1678config FORCE_MAX_ZONEORDER
36d6c928 1679 int "Maximum zone order"
898f08e1 1680 default "12" if SOC_AM33XX
6d85e2b0 1681 default "9" if SA1111 || ARCH_EFM32
c1b2d970
MD
1682 default "11"
1683 help
1684 The kernel memory allocator divides physically contiguous memory
1685 blocks into "zones", where each zone is a power of two number of
1686 pages. This option selects the largest power of two that the kernel
1687 keeps in the memory allocator. If you need to allocate very large
1688 blocks of physically contiguous memory, then you may need to
1689 increase this value.
1690
1691 This config option is actually maximum order plus one. For example,
1692 a value of 11 means that the largest free memory block is 2^10 pages.
1693
1da177e4
LT
1694config ALIGNMENT_TRAP
1695 bool
f12d0d7c 1696 depends on CPU_CP15_MMU
1da177e4 1697 default y if !ARCH_EBSA110
e119bfff 1698 select HAVE_PROC_CPU if PROC_FS
1da177e4 1699 help
84eb8d06 1700 ARM processors cannot fetch/store information which is not
1da177e4
LT
1701 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1702 address divisible by 4. On 32-bit ARM processors, these non-aligned
1703 fetch/store instructions will be emulated in software if you say
1704 here, which has a severe performance impact. This is necessary for
1705 correct operation of some network protocols. With an IP-only
1706 configuration it is safe to say N, otherwise say Y.
1707
39ec58f3 1708config UACCESS_WITH_MEMCPY
38ef2ad5
LW
1709 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
1710 depends on MMU
39ec58f3
LB
1711 default y if CPU_FEROCEON
1712 help
1713 Implement faster copy_to_user and clear_user methods for CPU
1714 cores where a 8-word STM instruction give significantly higher
1715 memory write throughput than a sequence of individual 32bit stores.
1716
1717 A possible side effect is a slight increase in scheduling latency
1718 between threads sharing the same address space if they invoke
1719 such copy operations with large buffers.
1720
1721 However, if the CPU data cache is using a write-allocate mode,
1722 this option is unlikely to provide any performance gain.
1723
70c70d97
NP
1724config SECCOMP
1725 bool
1726 prompt "Enable seccomp to safely compute untrusted bytecode"
1727 ---help---
1728 This kernel feature is useful for number crunching applications
1729 that may need to compute untrusted bytecode during their
1730 execution. By using pipes or other transports made available to
1731 the process as file descriptors supporting the read/write
1732 syscalls, it's possible to isolate those applications in
1733 their own address space using seccomp. Once seccomp is
1734 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1735 and the task is only allowed to execute a few safe syscalls
1736 defined by each seccomp mode.
1737
06e6295b
SS
1738config SWIOTLB
1739 def_bool y
1740
1741config IOMMU_HELPER
1742 def_bool SWIOTLB
1743
02c2433b
SS
1744config PARAVIRT
1745 bool "Enable paravirtualization code"
1746 help
1747 This changes the kernel so it can modify itself when it is run
1748 under a hypervisor, potentially improving performance significantly
1749 over full virtualization.
1750
1751config PARAVIRT_TIME_ACCOUNTING
1752 bool "Paravirtual steal time accounting"
1753 select PARAVIRT
1754 default n
1755 help
1756 Select this option to enable fine granularity task steal time
1757 accounting. Time spent executing other tasks in parallel with
1758 the current vCPU is discounted from the vCPU power. To account for
1759 that, there can be a small performance impact.
1760
1761 If in doubt, say N here.
1762
eff8d644
SS
1763config XEN_DOM0
1764 def_bool y
1765 depends on XEN
1766
1767config XEN
c2ba1f7d 1768 bool "Xen guest support on ARM"
85323a99 1769 depends on ARM && AEABI && OF
f880b67d 1770 depends on CPU_V7 && !CPU_V6
85323a99 1771 depends on !GENERIC_ATOMIC64
7693decc 1772 depends on MMU
51aaf81f 1773 select ARCH_DMA_ADDR_T_64BIT
17b7ab80 1774 select ARM_PSCI
83862ccf 1775 select SWIOTLB_XEN
02c2433b 1776 select PARAVIRT
eff8d644
SS
1777 help
1778 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
1779
1da177e4
LT
1780endmenu
1781
1782menu "Boot options"
1783
9eb8f674
GL
1784config USE_OF
1785 bool "Flattened Device Tree support"
b1b3f49c 1786 select IRQ_DOMAIN
9eb8f674 1787 select OF
9eb8f674
GL
1788 help
1789 Include support for flattened device tree machine descriptions.
1790
bd51e2f5
NP
1791config ATAGS
1792 bool "Support for the traditional ATAGS boot data passing" if USE_OF
1793 default y
1794 help
1795 This is the traditional way of passing data to the kernel at boot
1796 time. If you are solely relying on the flattened device tree (or
1797 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
1798 to remove ATAGS support from your kernel binary. If unsure,
1799 leave this to y.
1800
1801config DEPRECATED_PARAM_STRUCT
1802 bool "Provide old way to pass kernel parameters"
1803 depends on ATAGS
1804 help
1805 This was deprecated in 2001 and announced to live on for 5 years.
1806 Some old boot loaders still use this way.
1807
1da177e4
LT
1808# Compressed boot loader in ROM. Yes, we really want to ask about
1809# TEXT and BSS so we preserve their values in the config files.
1810config ZBOOT_ROM_TEXT
1811 hex "Compressed ROM boot loader base address"
1812 default "0"
1813 help
1814 The physical address at which the ROM-able zImage is to be
1815 placed in the target. Platforms which normally make use of
1816 ROM-able zImage formats normally set this to a suitable
1817 value in their defconfig file.
1818
1819 If ZBOOT_ROM is not enabled, this has no effect.
1820
1821config ZBOOT_ROM_BSS
1822 hex "Compressed ROM boot loader BSS address"
1823 default "0"
1824 help
f8c440b2
DF
1825 The base address of an area of read/write memory in the target
1826 for the ROM-able zImage which must be available while the
1827 decompressor is running. It must be large enough to hold the
1828 entire decompressed kernel plus an additional 128 KiB.
1829 Platforms which normally make use of ROM-able zImage formats
1830 normally set this to a suitable value in their defconfig file.
1da177e4
LT
1831
1832 If ZBOOT_ROM is not enabled, this has no effect.
1833
1834config ZBOOT_ROM
1835 bool "Compressed boot loader in ROM/flash"
1836 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
10968131 1837 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
1da177e4
LT
1838 help
1839 Say Y here if you intend to execute your compressed kernel image
1840 (zImage) directly from ROM or flash. If unsure, say N.
1841
e2a6a3aa
JB
1842config ARM_APPENDED_DTB
1843 bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
10968131 1844 depends on OF
e2a6a3aa
JB
1845 help
1846 With this option, the boot code will look for a device tree binary
1847 (DTB) appended to zImage
1848 (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
1849
1850 This is meant as a backward compatibility convenience for those
1851 systems with a bootloader that can't be upgraded to accommodate
1852 the documented boot protocol using a device tree.
1853
1854 Beware that there is very little in terms of protection against
1855 this option being confused by leftover garbage in memory that might
1856 look like a DTB header after a reboot if no actual DTB is appended
1857 to zImage. Do not leave this option active in a production kernel
1858 if you don't intend to always append a DTB. Proper passing of the
1859 location into r2 of a bootloader provided DTB is always preferable
1860 to this option.
1861
b90b9a38
NP
1862config ARM_ATAG_DTB_COMPAT
1863 bool "Supplement the appended DTB with traditional ATAG information"
1864 depends on ARM_APPENDED_DTB
1865 help
1866 Some old bootloaders can't be updated to a DTB capable one, yet
1867 they provide ATAGs with memory configuration, the ramdisk address,
1868 the kernel cmdline string, etc. Such information is dynamically
1869 provided by the bootloader and can't always be stored in a static
1870 DTB. To allow a device tree enabled kernel to be used with such
1871 bootloaders, this option allows zImage to extract the information
1872 from the ATAG list and store it at run time into the appended DTB.
1873
d0f34a11
GR
1874choice
1875 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
1876 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1877
1878config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
1879 bool "Use bootloader kernel arguments if available"
1880 help
1881 Uses the command-line options passed by the boot loader instead of
1882 the device tree bootargs property. If the boot loader doesn't provide
1883 any, the device tree bootargs property will be used.
1884
1885config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
1886 bool "Extend with bootloader kernel arguments"
1887 help
1888 The command-line arguments provided by the boot loader will be
1889 appended to the the device tree bootargs property.
1890
1891endchoice
1892
1da177e4
LT
1893config CMDLINE
1894 string "Default kernel command string"
1895 default ""
1896 help
1897 On some architectures (EBSA110 and CATS), there is currently no way
1898 for the boot loader to pass arguments to the kernel. For these
1899 architectures, you should supply some command-line options at build
1900 time by entering them here. As a minimum, you should specify the
1901 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1902
4394c124
VB
1903choice
1904 prompt "Kernel command line type" if CMDLINE != ""
1905 default CMDLINE_FROM_BOOTLOADER
bd51e2f5 1906 depends on ATAGS
4394c124
VB
1907
1908config CMDLINE_FROM_BOOTLOADER
1909 bool "Use bootloader kernel arguments if available"
1910 help
1911 Uses the command-line options passed by the boot loader. If
1912 the boot loader doesn't provide any, the default kernel command
1913 string provided in CMDLINE will be used.
1914
1915config CMDLINE_EXTEND
1916 bool "Extend bootloader kernel arguments"
1917 help
1918 The command-line arguments provided by the boot loader will be
1919 appended to the default kernel command string.
1920
92d2040d
AH
1921config CMDLINE_FORCE
1922 bool "Always use the default kernel command string"
92d2040d
AH
1923 help
1924 Always use the default kernel command string, even if the boot
1925 loader passes other arguments to the kernel.
1926 This is useful if you cannot or don't want to change the
1927 command-line options your boot loader passes to the kernel.
4394c124 1928endchoice
92d2040d 1929
1da177e4
LT
1930config XIP_KERNEL
1931 bool "Kernel Execute-In-Place from ROM"
10968131 1932 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
1da177e4
LT
1933 help
1934 Execute-In-Place allows the kernel to run from non-volatile storage
1935 directly addressable by the CPU, such as NOR flash. This saves RAM
1936 space since the text section of the kernel is not loaded from flash
1937 to RAM. Read-write sections, such as the data section and stack,
1938 are still copied to RAM. The XIP kernel is not compressed since
1939 it has to run directly from flash, so it will take more space to
1940 store it. The flash address used to link the kernel object files,
1941 and for storing it, is configuration dependent. Therefore, if you
1942 say Y here, you must know the proper physical address where to
1943 store the kernel image depending on your own flash memory usage.
1944
1945 Also note that the make target becomes "make xipImage" rather than
1946 "make zImage" or "make Image". The final kernel binary to put in
1947 ROM memory will be arch/arm/boot/xipImage.
1948
1949 If unsure, say N.
1950
1951config XIP_PHYS_ADDR
1952 hex "XIP Kernel Physical Location"
1953 depends on XIP_KERNEL
1954 default "0x00080000"
1955 help
1956 This is the physical address in your flash memory the kernel will
1957 be linked for and stored to. This address is dependent on your
1958 own flash usage.
1959
c587e4a6
RP
1960config KEXEC
1961 bool "Kexec system call (EXPERIMENTAL)"
19ab428f 1962 depends on (!SMP || PM_SLEEP_SMP)
cb1293e2 1963 depends on !CPU_V7M
2965faa5 1964 select KEXEC_CORE
c587e4a6
RP
1965 help
1966 kexec is a system call that implements the ability to shutdown your
1967 current kernel, and to start another kernel. It is like a reboot
01dd2fbf 1968 but it is independent of the system firmware. And like a reboot
c587e4a6
RP
1969 you can start any kernel with it, not just Linux.
1970
1971 It is an ongoing process to be certain the hardware in a machine
1972 is properly shutdown, so do not be surprised if this code does not
bf220695 1973 initially work for you.
c587e4a6 1974
4cd9d6f7
RP
1975config ATAGS_PROC
1976 bool "Export atags in procfs"
bd51e2f5 1977 depends on ATAGS && KEXEC
b98d7291 1978 default y
4cd9d6f7
RP
1979 help
1980 Should the atags used to boot the kernel be exported in an "atags"
1981 file in procfs. Useful with kexec.
1982
cb5d39b3
MW
1983config CRASH_DUMP
1984 bool "Build kdump crash kernel (EXPERIMENTAL)"
cb5d39b3
MW
1985 help
1986 Generate crash dump after being started by kexec. This should
1987 be normally only set in special crash dump kernels which are
1988 loaded in the main kernel with kexec-tools into a specially
1989 reserved region and then later executed after a crash by
1990 kdump/kexec. The crash dump kernel must be compiled to a
1991 memory address not used by the main kernel
1992
1993 For more details see Documentation/kdump/kdump.txt
1994
e69edc79
EM
1995config AUTO_ZRELADDR
1996 bool "Auto calculation of the decompressed kernel image address"
e69edc79
EM
1997 help
1998 ZRELADDR is the physical address where the decompressed kernel
1999 image will be placed. If AUTO_ZRELADDR is selected, the address
2000 will be determined at run-time by masking the current IP with
2001 0xf8000000. This assumes the zImage being placed in the first 128MB
2002 from start of memory.
2003
81a0bc39
RF
2004config EFI_STUB
2005 bool
2006
2007config EFI
2008 bool "UEFI runtime support"
2009 depends on OF && !CPU_BIG_ENDIAN && MMU && AUTO_ZRELADDR && !XIP_KERNEL
2010 select UCS2_STRING
2011 select EFI_PARAMS_FROM_FDT
2012 select EFI_STUB
2013 select EFI_ARMSTUB
2014 select EFI_RUNTIME_WRAPPERS
2015 ---help---
2016 This option provides support for runtime services provided
2017 by UEFI firmware (such as non-volatile variables, realtime
2018 clock, and platform reset). A UEFI stub is also provided to
2019 allow the kernel to be booted as an EFI application. This
2020 is only useful for kernels that may run on systems that have
2021 UEFI firmware.
2022
1da177e4
LT
2023endmenu
2024
ac9d7efc 2025menu "CPU Power Management"
1da177e4 2026
1da177e4 2027source "drivers/cpufreq/Kconfig"
1da177e4 2028
ac9d7efc
RK
2029source "drivers/cpuidle/Kconfig"
2030
2031endmenu
2032
1da177e4
LT
2033menu "Floating point emulation"
2034
2035comment "At least one emulation must be selected"
2036
2037config FPE_NWFPE
2038 bool "NWFPE math emulation"
593c252a 2039 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
1da177e4
LT
2040 ---help---
2041 Say Y to include the NWFPE floating point emulator in the kernel.
2042 This is necessary to run most binaries. Linux does not currently
2043 support floating point hardware so you need to say Y here even if
2044 your machine has an FPA or floating point co-processor podule.
2045
2046 You may say N here if you are going to load the Acorn FPEmulator
2047 early in the bootup.
2048
2049config FPE_NWFPE_XP
2050 bool "Support extended precision"
bedf142b 2051 depends on FPE_NWFPE
1da177e4
LT
2052 help
2053 Say Y to include 80-bit support in the kernel floating-point
2054 emulator. Otherwise, only 32 and 64-bit support is compiled in.
2055 Note that gcc does not generate 80-bit operations by default,
2056 so in most cases this option only enlarges the size of the
2057 floating point emulator without any good reason.
2058
2059 You almost surely want to say N here.
2060
2061config FPE_FASTFPE
2062 bool "FastFPE math emulation (EXPERIMENTAL)"
d6f94fa0 2063 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
1da177e4
LT
2064 ---help---
2065 Say Y here to include the FAST floating point emulator in the kernel.
2066 This is an experimental much faster emulator which now also has full
2067 precision for the mantissa. It does not support any exceptions.
2068 It is very simple, and approximately 3-6 times faster than NWFPE.
2069
2070 It should be sufficient for most programs. It may be not suitable
2071 for scientific calculations, but you have to check this for yourself.
2072 If you do not feel you need a faster FP emulation you should better
2073 choose NWFPE.
2074
2075config VFP
2076 bool "VFP-format floating point maths"
e399b1a4 2077 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1da177e4
LT
2078 help
2079 Say Y to include VFP support code in the kernel. This is needed
2080 if your hardware includes a VFP unit.
2081
2082 Please see <file:Documentation/arm/VFP/release-notes.txt> for
2083 release notes and additional status information.
2084
2085 Say N if your target does not have VFP hardware.
2086
25ebee02
CM
2087config VFPv3
2088 bool
2089 depends on VFP
2090 default y if CPU_V7
2091
b5872db4
CM
2092config NEON
2093 bool "Advanced SIMD (NEON) Extension support"
2094 depends on VFPv3 && CPU_V7
2095 help
2096 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
2097 Extension.
2098
73c132c1
AB
2099config KERNEL_MODE_NEON
2100 bool "Support for NEON in kernel mode"
c4a30c3b 2101 depends on NEON && AEABI
73c132c1
AB
2102 help
2103 Say Y to include support for NEON in kernel mode.
2104
1da177e4
LT
2105endmenu
2106
2107menu "Userspace binary formats"
2108
2109source "fs/Kconfig.binfmt"
2110
1da177e4
LT
2111endmenu
2112
2113menu "Power management options"
2114
eceab4ac 2115source "kernel/power/Kconfig"
1da177e4 2116
f4cb5700 2117config ARCH_SUSPEND_POSSIBLE
19a0519d 2118 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
f0d75153 2119 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
f4cb5700
JB
2120 def_bool y
2121
15e0d9e3 2122config ARM_CPU_SUSPEND
8b6f2499 2123 def_bool PM_SLEEP || BL_SWITCHER || ARM_PSCI_FW
1b9bdf5c 2124 depends on ARCH_SUSPEND_POSSIBLE
15e0d9e3 2125
603fb42a
SC
2126config ARCH_HIBERNATION_POSSIBLE
2127 bool
2128 depends on MMU
2129 default y if ARCH_SUSPEND_POSSIBLE
2130
1da177e4
LT
2131endmenu
2132
d5950b43
SR
2133source "net/Kconfig"
2134
ac25150f 2135source "drivers/Kconfig"
1da177e4 2136
916f743d
KG
2137source "drivers/firmware/Kconfig"
2138
1da177e4
LT
2139source "fs/Kconfig"
2140
1da177e4
LT
2141source "arch/arm/Kconfig.debug"
2142
2143source "security/Kconfig"
2144
2145source "crypto/Kconfig"
652ccae5
AB
2146if CRYPTO
2147source "arch/arm/crypto/Kconfig"
2148endif
1da177e4
LT
2149
2150source "lib/Kconfig"
749cf76c
CD
2151
2152source "arch/arm/kvm/Kconfig"