Create arch/Kconfig
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / Kconfig
CommitLineData
1da177e4
LT
1#
2# For a description of the syntax of this configuration file,
3# see Documentation/kbuild/kconfig-language.txt.
4#
5
6mainmenu "Linux Kernel Configuration"
7
8config ARM
9 bool
10 default y
12b824fb 11 select RTC_LIB
75e7153a 12 select SYS_SUPPORTS_APM_EMULATION
1da177e4
LT
13 help
14 The ARM series is a line of low-power-consumption RISC chip designs
f6c8965a 15 licensed by ARM Ltd and targeted at embedded applications and
1da177e4 16 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
f6c8965a 17 manufactured, but legacy ARM-based PC hardware remains popular in
1da177e4
LT
18 Europe. There is an ARM Linux project with a web page at
19 <http://www.arm.linux.org.uk/>.
20
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RB
21config SYS_SUPPORTS_APM_EMULATION
22 bool
23
0a938b97
DB
24config GENERIC_GPIO
25 bool
26 default n
27
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KH
28config GENERIC_TIME
29 bool
30 default n
31
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KH
32config GENERIC_CLOCKEVENTS
33 bool
34 default n
35
1da177e4
LT
36config MMU
37 bool
38 default y
39
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AV
40config NO_IOPORT
41 bool
42 default n
43
1da177e4
LT
44config EISA
45 bool
46 ---help---
47 The Extended Industry Standard Architecture (EISA) bus was
48 developed as an open alternative to the IBM MicroChannel bus.
49
50 The EISA bus provided some of the features of the IBM MicroChannel
51 bus while maintaining backward compatibility with cards made for
52 the older ISA bus. The EISA bus saw limited use between 1988 and
53 1995 when it was made obsolete by the PCI bus.
54
55 Say Y here if you are building a kernel for an EISA-based machine.
56
57 Otherwise, say N.
58
59config SBUS
60 bool
61
62config MCA
63 bool
64 help
65 MicroChannel Architecture is found in some IBM PS/2 machines and
66 laptops. It is a bus system similar to PCI or ISA. See
67 <file:Documentation/mca.txt> (and especially the web page given
68 there) before attempting to build an MCA bus kernel.
69
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TG
70config GENERIC_HARDIRQS
71 bool
72 default y
73
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74config STACKTRACE_SUPPORT
75 bool
76 default y
77
78config LOCKDEP_SUPPORT
79 bool
80 default y
81
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82config TRACE_IRQFLAGS_SUPPORT
83 bool
84 default y
85
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86config HARDIRQS_SW_RESEND
87 bool
88 default y
89
90config GENERIC_IRQ_PROBE
91 bool
92 default y
93
95c354fe
NP
94config GENERIC_LOCKBREAK
95 bool
96 default y
97 depends on SMP && PREEMPT
98
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LT
99config RWSEM_GENERIC_SPINLOCK
100 bool
101 default y
102
103config RWSEM_XCHGADD_ALGORITHM
104 bool
105
f0d1b0b3
DH
106config ARCH_HAS_ILOG2_U32
107 bool
108 default n
109
110config ARCH_HAS_ILOG2_U64
111 bool
112 default n
113
b89c3b16
AM
114config GENERIC_HWEIGHT
115 bool
116 default y
117
1da177e4
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118config GENERIC_CALIBRATE_DELAY
119 bool
120 default y
121
a08b6b79
AV
122config ARCH_MAY_HAVE_PC_FDC
123 bool
124
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CL
125config ZONE_DMA
126 bool
127 default y
128
1da177e4
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129config GENERIC_ISA_DMA
130 bool
131
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132config FIQ
133 bool
134
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135config ARCH_MTD_XIP
136 bool
137
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MD
138if OPROFILE
139
140config OPROFILE_ARMV6
141 def_bool y
142 depends on CPU_V6 && !SMP
143 select OPROFILE_ARM11_CORE
144
145config OPROFILE_MPCORE
146 def_bool y
147 depends on CPU_V6 && SMP
148 select OPROFILE_ARM11_CORE
149
150config OPROFILE_ARM11_CORE
151 bool
152
153endif
154
c760fc19
HC
155config VECTORS_BASE
156 hex
6afd6fae 157 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
c760fc19
HC
158 default DRAM_BASE if REMAP_VECTORS_TO_RAM
159 default 0x00000000
160 help
161 The base address of exception vectors.
162
1da177e4
LT
163source "init/Kconfig"
164
165menu "System Type"
166
167choice
168 prompt "ARM system type"
6a0e2430 169 default ARCH_VERSATILE
1da177e4 170
4af6fee1
DS
171config ARCH_AAEC2000
172 bool "Agilent AAEC-2000 based"
173 select ARM_AMBA
174 help
175 This enables support for systems based on the Agilent AAEC-2000
176
177config ARCH_INTEGRATOR
178 bool "ARM Ltd. Integrator family"
179 select ARM_AMBA
180 select ICST525
181 help
182 Support for ARM's Integrator platform.
183
184config ARCH_REALVIEW
185 bool "ARM Ltd. RealView family"
186 select ARM_AMBA
187 select ICST307
188 help
189 This enables support for ARM Ltd RealView boards.
190
191config ARCH_VERSATILE
192 bool "ARM Ltd. Versatile family"
193 select ARM_AMBA
194 select ARM_VIC
195 select ICST307
b49c87c2 196 select GENERIC_TIME
89df1272 197 select GENERIC_CLOCKEVENTS
4af6fee1
DS
198 help
199 This enables support for ARM Ltd Versatile board.
200
8fc5ffa0
AV
201config ARCH_AT91
202 bool "Atmel AT91"
0a938b97 203 select GENERIC_GPIO
4af6fee1 204 help
2b3b3516
AV
205 This enables support for systems based on the Atmel AT91RM9200,
206 AT91SAM9 and AT91CAP9 processors.
4af6fee1 207
1da177e4 208config ARCH_CLPS7500
4af6fee1 209 bool "Cirrus CL-PS7500FE"
1da177e4 210 select TIMER_ACORN
f7e68bbf 211 select ISA
e4169889 212 select NO_IOPORT
f999b8bd
MM
213 help
214 Support for the Cirrus Logic PS7500FE system-on-a-chip.
1da177e4
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215
216config ARCH_CLPS711X
4af6fee1 217 bool "Cirrus Logic CLPS711x/EP721x-based"
f999b8bd
MM
218 help
219 Support for Cirrus Logic 711x/721x based boards.
1da177e4
LT
220
221config ARCH_CO285
222 bool "Co-EBSA285"
223 select FOOTBRIDGE
224 select FOOTBRIDGE_ADDIN
f999b8bd
MM
225 help
226 Support for Intel's EBSA285 companion chip.
1da177e4
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227
228config ARCH_EBSA110
229 bool "EBSA-110"
f7e68bbf 230 select ISA
c5eb2a2b 231 select NO_IOPORT
1da177e4
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232 help
233 This is an evaluation board for the StrongARM processor available
f6c8965a 234 from Digital. It has limited hardware on-board, including an
1da177e4
LT
235 Ethernet interface, two PCMCIA sockets, two serial ports and a
236 parallel port.
237
e7736d47
LB
238config ARCH_EP93XX
239 bool "EP93xx-based"
240 select ARM_AMBA
241 select ARM_VIC
4e9f9fd5 242 select GENERIC_GPIO
e7736d47
LB
243 help
244 This enables support for the Cirrus EP93xx series of CPUs.
245
1da177e4
LT
246config ARCH_FOOTBRIDGE
247 bool "FootBridge"
248 select FOOTBRIDGE
f999b8bd
MM
249 help
250 Support for systems based on the DC21285 companion chip
251 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
1da177e4 252
4af6fee1
DS
253config ARCH_NETX
254 bool "Hilscher NetX based"
255 select ARM_VIC
f999b8bd 256 help
4af6fee1
DS
257 This enables support for systems based on the Hilscher NetX Soc
258
259config ARCH_H720X
260 bool "Hynix HMS720x-based"
261 select ISA_DMA_API
262 help
263 This enables support for systems based on the Hynix HMS720x
264
265config ARCH_IMX
266 bool "IMX"
b3e6a508 267 select GENERIC_GPIO
89bba435
PP
268 select GENERIC_TIME
269 select GENERIC_CLOCKEVENTS
4af6fee1
DS
270 help
271 Support for Motorola's i.MX family of processors (MX1, MXL).
1da177e4 272
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RK
273config ARCH_IOP13XX
274 bool "IOP13xx-based"
275 depends on MMU
276 select PLAT_IOP
277 select PCI
278 select ARCH_SUPPORTS_MSI
279 help
280 Support for Intel's IOP13XX (XScale) family of processors.
281
3f7e5815
LB
282config ARCH_IOP32X
283 bool "IOP32x-based"
a4f7e763 284 depends on MMU
7ae1f7ec 285 select PLAT_IOP
f7e68bbf 286 select PCI
f999b8bd 287 help
3f7e5815
LB
288 Support for Intel's 80219 and IOP32X (XScale) family of
289 processors.
290
291config ARCH_IOP33X
292 bool "IOP33x-based"
293 depends on MMU
7ae1f7ec 294 select PLAT_IOP
3f7e5815
LB
295 select PCI
296 help
297 Support for Intel's IOP33X (XScale) family of processors.
1da177e4 298
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RK
299config ARCH_IXP23XX
300 bool "IXP23XX-based"
a4f7e763 301 depends on MMU
3b938be6 302 select PCI
f999b8bd 303 help
3b938be6 304 Support for Intel's IXP23xx (XScale) family of processors.
1da177e4
LT
305
306config ARCH_IXP2000
307 bool "IXP2400/2800-based"
a4f7e763 308 depends on MMU
f7e68bbf 309 select PCI
f999b8bd
MM
310 help
311 Support for Intel's IXP2400/2800 (XScale) family of processors.
1da177e4 312
3b938be6
RK
313config ARCH_IXP4XX
314 bool "IXP4xx-based"
a4f7e763 315 depends on MMU
8858e9af 316 select GENERIC_GPIO
3b938be6
RK
317 select GENERIC_TIME
318 select GENERIC_CLOCKEVENTS
c4713074 319 help
3b938be6 320 Support for Intel's IXP4XX (XScale) family of processors.
c4713074 321
1da177e4
LT
322config ARCH_L7200
323 bool "LinkUp-L7200"
324 select FIQ
325 help
326 Say Y here if you intend to run this kernel on a LinkUp Systems
327 L7200 Software Development Board which uses an ARM720T processor.
328 Information on this board can be obtained at:
329
330 <http://www.linkupsys.com/>
331
332 If you have any questions or comments about the Linux kernel port
333 to this board, send e-mail to <sjhill@cotw.com>.
334
c53c9cf6
AV
335config ARCH_KS8695
336 bool "Micrel/Kendin KS8695"
8a87a996 337 select GENERIC_GPIO
c53c9cf6
AV
338 help
339 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
340 System-on-Chip devices.
341
9918cda5
UKK
342config ARCH_NS9XXX
343 bool "NetSilicon NS9xxx"
689f2a01 344 select GENERIC_GPIO
cef5975d 345 select GENERIC_TIME
c0bb87f7 346 select GENERIC_CLOCKEVENTS
9918cda5
UKK
347 help
348 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
349 System.
350
351 <http://www.digi.com/products/microprocessors/index.jsp>
352
52c543f9
QJ
353config ARCH_MXC
354 bool "Freescale MXC/iMX-based"
355 select ARCH_MTD_XIP
356 help
357 Support for Freescale MXC/iMX-based family of processors
358
585cf175
TP
359config ARCH_ORION
360 bool "Marvell Orion"
361 depends on MMU
038ee083 362 select PCI
01af72e4 363 select GENERIC_GPIO
51cbff1d
TP
364 select GENERIC_TIME
365 select GENERIC_CLOCKEVENTS
585cf175
TP
366 help
367 Support for Marvell Orion System on Chip family.
368
4af6fee1
DS
369config ARCH_PNX4008
370 bool "Philips Nexperia PNX4008 Mobile"
371 help
372 This enables support for Philips PNX4008 mobile platform.
373
1da177e4 374config ARCH_PXA
2c8086a5 375 bool "PXA2xx/PXA3xx-based"
a4f7e763 376 depends on MMU
034d2f5a 377 select ARCH_MTD_XIP
0a938b97 378 select GENERIC_GPIO
45cf5eef 379 select GENERIC_TIME
981d0f39 380 select GENERIC_CLOCKEVENTS
a88264c2 381 select TICK_ONESHOT
f999b8bd 382 help
2c8086a5 383 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
1da177e4
LT
384
385config ARCH_RPC
386 bool "RiscPC"
387 select ARCH_ACORN
388 select FIQ
389 select TIMER_ACORN
a08b6b79 390 select ARCH_MAY_HAVE_PC_FDC
065909b9 391 select ISA_DMA_API
5ea81769 392 select NO_IOPORT
1da177e4
LT
393 help
394 On the Acorn Risc-PC, Linux can support the internal IDE disk and
395 CD-ROM interface, serial and parallel port, and the floppy drive.
396
397config ARCH_SA1100
398 bool "SA1100-based"
f7e68bbf 399 select ISA
3cd9e19e 400 select ARCH_DISCONTIGMEM_ENABLE
034d2f5a 401 select ARCH_MTD_XIP
0a938b97 402 select GENERIC_GPIO
d142b6e7 403 select GENERIC_TIME
f999b8bd
MM
404 help
405 Support for StrongARM 11x0 based boards.
1da177e4
LT
406
407config ARCH_S3C2410
e4d06e39 408 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
0a938b97 409 select GENERIC_GPIO
1da177e4
LT
410 help
411 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
412 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
f6c8965a 413 the Samsung SMDK2410 development board (and derivatives).
1da177e4
LT
414
415config ARCH_SHARK
416 bool "Shark"
f7e68bbf
RK
417 select ISA
418 select ISA_DMA
419 select PCI
f999b8bd
MM
420 help
421 Support for the StrongARM based Digital DNARD machine, also known
422 as "Shark" (<http://www.shark-linux.de/shark.html>).
1da177e4
LT
423
424config ARCH_LH7A40X
425 bool "Sharp LH7A40X"
426 help
427 Say Y here for systems based on one of the Sharp LH7A40X
428 System on a Chip processors. These CPUs include an ARM922T
429 core with a wide array of integrated devices for
430 hand-held and low-power applications.
431
7c6337e2
KH
432config ARCH_DAVINCI
433 bool "TI DaVinci"
434 select GENERIC_TIME
435 select GENERIC_CLOCKEVENTS
3d9edf09 436 select GENERIC_GPIO
7c6337e2
KH
437 help
438 Support for TI's DaVinci platform.
439
3b938be6
RK
440config ARCH_OMAP
441 bool "TI OMAP"
442 select GENERIC_GPIO
443 select GENERIC_TIME
444 help
445 Support for TI's OMAP platform (OMAP1 and OMAP2).
446
3042102a
BS
447config ARCH_MSM7X00A
448 bool "Qualcomm MSM7X00A"
449 select GENERIC_TIME
450 select GENERIC_CLOCKEVENTS
451 help
452 Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
453 apps processor of the MSM7X00A and depends on a shared memory
454 interface to the ARM9 modem processor which runs the baseband stack
455 and controls some vital subsystems (clock and power control, etc).
456 <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
457
1da177e4
LT
458endchoice
459
460source "arch/arm/mach-clps711x/Kconfig"
461
e7736d47
LB
462source "arch/arm/mach-ep93xx/Kconfig"
463
1da177e4
LT
464source "arch/arm/mach-footbridge/Kconfig"
465
466source "arch/arm/mach-integrator/Kconfig"
467
3f7e5815
LB
468source "arch/arm/mach-iop32x/Kconfig"
469
470source "arch/arm/mach-iop33x/Kconfig"
1da177e4 471
285f5fa7
DW
472source "arch/arm/mach-iop13xx/Kconfig"
473
1da177e4
LT
474source "arch/arm/mach-ixp4xx/Kconfig"
475
476source "arch/arm/mach-ixp2000/Kconfig"
477
c4713074
LB
478source "arch/arm/mach-ixp23xx/Kconfig"
479
1da177e4
LT
480source "arch/arm/mach-pxa/Kconfig"
481
482source "arch/arm/mach-sa1100/Kconfig"
483
d48af15e
TL
484source "arch/arm/plat-omap/Kconfig"
485
486source "arch/arm/mach-omap1/Kconfig"
1da177e4 487
1dbae815
TL
488source "arch/arm/mach-omap2/Kconfig"
489
585cf175
TP
490source "arch/arm/mach-orion/Kconfig"
491
a21765a7 492source "arch/arm/plat-s3c24xx/Kconfig"
d58153d8 493source "arch/arm/plat-s3c/Kconfig"
a21765a7
BD
494
495if ARCH_S3C2410
496source "arch/arm/mach-s3c2400/Kconfig"
1da177e4 497source "arch/arm/mach-s3c2410/Kconfig"
a21765a7
BD
498source "arch/arm/mach-s3c2412/Kconfig"
499source "arch/arm/mach-s3c2440/Kconfig"
500source "arch/arm/mach-s3c2442/Kconfig"
e4d06e39 501source "arch/arm/mach-s3c2443/Kconfig"
a21765a7 502endif
1da177e4
LT
503
504source "arch/arm/mach-lh7a40x/Kconfig"
505
506source "arch/arm/mach-imx/Kconfig"
507
508source "arch/arm/mach-h720x/Kconfig"
509
510source "arch/arm/mach-versatile/Kconfig"
511
038c5b60
BN
512source "arch/arm/mach-aaec2000/Kconfig"
513
8ad68bbf
CM
514source "arch/arm/mach-realview/Kconfig"
515
9d041268 516source "arch/arm/mach-at91/Kconfig"
73a59c1c 517
52c543f9
QJ
518source "arch/arm/plat-mxc/Kconfig"
519
bb6d8c88
SH
520source "arch/arm/mach-netx/Kconfig"
521
9918cda5
UKK
522source "arch/arm/mach-ns9xxx/Kconfig"
523
7c6337e2
KH
524source "arch/arm/mach-davinci/Kconfig"
525
c53c9cf6
AV
526source "arch/arm/mach-ks8695/Kconfig"
527
9e73c84c
BS
528source "arch/arm/mach-msm/Kconfig"
529
1da177e4
LT
530# Definitions to make life easier
531config ARCH_ACORN
532 bool
533
7ae1f7ec
LB
534config PLAT_IOP
535 bool
536
1da177e4
LT
537source arch/arm/mm/Kconfig
538
afe4b25e
LB
539config IWMMXT
540 bool "Enable iWMMXt support"
6340aa61 541 depends on CPU_XSCALE || CPU_XSC3
2c8086a5 542 default y if PXA27x || PXA3xx
afe4b25e
LB
543 help
544 Enable support for iWMMXt context switching at run time if
545 running on a CPU that supports it.
546
1da177e4
LT
547# bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
548config XSCALE_PMU
549 bool
550 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
551 default y
552
3b93e7b0
HC
553if !MMU
554source "arch/arm/Kconfig-nommu"
555endif
556
1da177e4
LT
557endmenu
558
559source "arch/arm/common/Kconfig"
560
561config FORCE_MAX_ZONEORDER
562 int
563 depends on SA1111
564 default "9"
565
566menu "Bus support"
567
568config ARM_AMBA
569 bool
570
571config ISA
572 bool
1da177e4
LT
573 help
574 Find out whether you have ISA slots on your motherboard. ISA is the
575 name of a bus system, i.e. the way the CPU talks to the other stuff
576 inside your box. Other bus systems are PCI, EISA, MicroChannel
577 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
578 newer boards don't support it. If you have ISA, say Y, otherwise N.
579
065909b9 580# Select ISA DMA controller support
1da177e4
LT
581config ISA_DMA
582 bool
065909b9 583 select ISA_DMA_API
1da177e4 584
065909b9 585# Select ISA DMA interface
5cae841b
AV
586config ISA_DMA_API
587 bool
5cae841b 588
1da177e4 589config PCI
a0113a99 590 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
1da177e4
LT
591 help
592 Find out whether you have a PCI motherboard. PCI is the name of a
593 bus system, i.e. the way the CPU talks to the other stuff inside
594 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
595 VESA. If you have PCI, say Y, otherwise N.
596
36e23590
MW
597config PCI_SYSCALL
598 def_bool PCI
599
1da177e4
LT
600# Select the host bridge type
601config PCI_HOST_VIA82C505
602 bool
603 depends on PCI && ARCH_SHARK
604 default y
605
a0113a99
MR
606config PCI_HOST_ITE8152
607 bool
608 depends on PCI && MACH_ARMCORE
609 default y
610 select DMABOUNCE
611
1da177e4
LT
612source "drivers/pci/Kconfig"
613
614source "drivers/pcmcia/Kconfig"
615
616endmenu
617
618menu "Kernel Features"
619
0567a0c0
KH
620source "kernel/time/Kconfig"
621
1da177e4
LT
622config SMP
623 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
f6db449c 624 depends on EXPERIMENTAL && REALVIEW_MPCORE
1da177e4
LT
625 help
626 This enables support for systems with more than one CPU. If you have
627 a system with only one CPU, like most personal computers, say N. If
628 you have a system with more than one CPU, say Y.
629
630 If you say N here, the kernel will run on single and multiprocessor
631 machines, but will use only one CPU of a multiprocessor machine. If
632 you say Y here, the kernel will run on many, but not all, single
633 processor machines. On a single processor machine, the kernel will
634 run faster if you say N here.
635
12c62c2e
AO
636 See also the <file:Documentation/smp.txt>,
637 <file:Documentation/i386/IO-APIC.txt>,
1da177e4
LT
638 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
639 <http://www.linuxdoc.org/docs.html#howto>.
640
641 If you don't know what to do here, say N.
642
643config NR_CPUS
644 int "Maximum number of CPUs (2-32)"
645 range 2 32
646 depends on SMP
647 default "4"
648
a054a811
RK
649config HOTPLUG_CPU
650 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
651 depends on SMP && HOTPLUG && EXPERIMENTAL
652 help
653 Say Y here to experiment with turning CPUs off and on. CPUs
654 can be controlled through /sys/devices/system/cpu.
655
37ee16ae
RK
656config LOCAL_TIMERS
657 bool "Use local timer interrupts"
2a98beb6 658 depends on SMP && REALVIEW_MPCORE
37ee16ae
RK
659 default y
660 help
661 Enable support for local timers on SMP platforms, rather then the
662 legacy IPI broadcast method. Local timers allows the system
663 accounting to be spread across the timer interval, preventing a
664 "thundering herd" at every timer tick.
665
1da177e4
LT
666config PREEMPT
667 bool "Preemptible Kernel (EXPERIMENTAL)"
668 depends on EXPERIMENTAL
669 help
670 This option reduces the latency of the kernel when reacting to
671 real-time or interactive events by allowing a low priority process to
672 be preempted even if it is in kernel mode executing a system call.
673 This allows applications to run more reliably even when the system is
674 under load.
675
676 Say Y here if you are building a kernel for a desktop, embedded
677 or real-time system. Say N if you are unsure.
678
8749af68
RK
679config NO_IDLE_HZ
680 bool "Dynamic tick timer"
0567a0c0 681 depends on !GENERIC_CLOCKEVENTS
8749af68
RK
682 help
683 Select this option if you want to disable continuous timer ticks
684 and have them programmed to occur as required. This option saves
685 power as the system can remain in idle state for longer.
686
687 By default dynamic tick is disabled during the boot, and can be
688 manually enabled with:
689
690 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
691
692 Alternatively, if you want dynamic tick automatically enabled
693 during boot, pass "dyntick=enable" via the kernel command string.
694
f2be64b3
TL
695 Please note that dynamic tick may affect the accuracy of
696 timekeeping on some platforms depending on the implementation.
569d2c34
NP
697 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
698 to have accurate timekeeping with dynamic tick.
f2be64b3 699
f8065813
RK
700config HZ
701 int
702 default 128 if ARCH_L7200
703 default 200 if ARCH_EBSA110 || ARCH_S3C2410
bfe65704 704 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
5248c657 705 default AT91_TIMER_HZ if ARCH_AT91
f8065813
RK
706 default 100
707
704bdda0
NP
708config AEABI
709 bool "Use the ARM EABI to compile the kernel"
710 help
711 This option allows for the kernel to be compiled using the latest
712 ARM ABI (aka EABI). This is only useful if you are using a user
713 space environment that is also compiled with EABI.
714
715 Since there are major incompatibilities between the legacy ABI and
716 EABI, especially with regard to structure member alignment, this
717 option also changes the kernel syscall calling convention to
718 disambiguate both ABIs and allow for backward compatibility support
719 (selected with CONFIG_OABI_COMPAT).
720
721 To use this you need GCC version 4.0.0 or later.
722
6c90c872 723config OABI_COMPAT
a73a3ff1 724 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
61c484d4 725 depends on AEABI && EXPERIMENTAL
6c90c872
NP
726 default y
727 help
728 This option preserves the old syscall interface along with the
729 new (ARM EABI) one. It also provides a compatibility layer to
730 intercept syscalls that have structure arguments which layout
731 in memory differs between the legacy ABI and the new ARM EABI
732 (only for non "thumb" binaries). This option adds a tiny
733 overhead to all syscalls and produces a slightly larger kernel.
734 If you know you'll be using only pure EABI user space then you
735 can say N here. If this option is not selected and you attempt
736 to execute a legacy ABI binary then the result will be
737 UNPREDICTABLE (in fact it can be predicted that it won't work
738 at all). If in doubt say Y.
739
3f22ab27 740config ARCH_DISCONTIGMEM_ENABLE
1da177e4 741 bool
f7e68bbf 742 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
1da177e4
LT
743 help
744 Say Y to support efficient handling of discontiguous physical memory,
745 for architectures which are either NUMA (Non-Uniform Memory Access)
746 or have huge holes in the physical address space for other reasons.
747 See <file:Documentation/vm/numa> for more.
748
c80d79d7
YG
749config NODES_SHIFT
750 int
751 default "4" if ARCH_LH7A40X
752 default "2"
753 depends on NEED_MULTIPLE_NODES
754
3f22ab27
DH
755source "mm/Kconfig"
756
1da177e4
LT
757config LEDS
758 bool "Timer and CPU usage LEDs"
759 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
760 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
761 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
762 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
73a59c1c 763 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
c53c9cf6 764 ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
817eb210 765 ARCH_KS8695 || MACH_RD88F5182
1da177e4
LT
766 help
767 If you say Y here, the LEDs on your machine will be used
768 to provide useful information about your current system status.
769
770 If you are compiling a kernel for a NetWinder or EBSA-285, you will
771 be able to select which LEDs are active using the options below. If
772 you are compiling a kernel for the EBSA-110 or the LART however, the
773 red LED will simply flash regularly to indicate that the system is
774 still functional. It is safe to say Y here if you have a CATS
775 system, but the driver will do nothing.
776
777config LEDS_TIMER
778 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
eebdf7d7
DB
779 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
780 || MACH_OMAP_PERSEUS2
1da177e4 781 depends on LEDS
0567a0c0 782 depends on !GENERIC_CLOCKEVENTS
1da177e4
LT
783 default y if ARCH_EBSA110
784 help
785 If you say Y here, one of the system LEDs (the green one on the
786 NetWinder, the amber one on the EBSA285, or the red one on the LART)
787 will flash regularly to indicate that the system is still
788 operational. This is mainly useful to kernel hackers who are
789 debugging unstable kernels.
790
791 The LART uses the same LED for both Timer LED and CPU usage LED
792 functions. You may choose to use both, but the Timer LED function
793 will overrule the CPU usage LED.
794
795config LEDS_CPU
796 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
eebdf7d7
DB
797 !ARCH_OMAP) \
798 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
799 || MACH_OMAP_PERSEUS2
1da177e4
LT
800 depends on LEDS
801 help
802 If you say Y here, the red LED will be used to give a good real
803 time indication of CPU usage, by lighting whenever the idle task
804 is not currently executing.
805
806 The LART uses the same LED for both Timer LED and CPU usage LED
807 functions. You may choose to use both, but the Timer LED function
808 will overrule the CPU usage LED.
809
810config ALIGNMENT_TRAP
811 bool
f12d0d7c 812 depends on CPU_CP15_MMU
1da177e4
LT
813 default y if !ARCH_EBSA110
814 help
84eb8d06 815 ARM processors cannot fetch/store information which is not
1da177e4
LT
816 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
817 address divisible by 4. On 32-bit ARM processors, these non-aligned
818 fetch/store instructions will be emulated in software if you say
819 here, which has a severe performance impact. This is necessary for
820 correct operation of some network protocols. With an IP-only
821 configuration it is safe to say N, otherwise say Y.
822
823endmenu
824
825menu "Boot options"
826
827# Compressed boot loader in ROM. Yes, we really want to ask about
828# TEXT and BSS so we preserve their values in the config files.
829config ZBOOT_ROM_TEXT
830 hex "Compressed ROM boot loader base address"
831 default "0"
832 help
833 The physical address at which the ROM-able zImage is to be
834 placed in the target. Platforms which normally make use of
835 ROM-able zImage formats normally set this to a suitable
836 value in their defconfig file.
837
838 If ZBOOT_ROM is not enabled, this has no effect.
839
840config ZBOOT_ROM_BSS
841 hex "Compressed ROM boot loader BSS address"
842 default "0"
843 help
f8c440b2
DF
844 The base address of an area of read/write memory in the target
845 for the ROM-able zImage which must be available while the
846 decompressor is running. It must be large enough to hold the
847 entire decompressed kernel plus an additional 128 KiB.
848 Platforms which normally make use of ROM-able zImage formats
849 normally set this to a suitable value in their defconfig file.
1da177e4
LT
850
851 If ZBOOT_ROM is not enabled, this has no effect.
852
853config ZBOOT_ROM
854 bool "Compressed boot loader in ROM/flash"
855 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
856 help
857 Say Y here if you intend to execute your compressed kernel image
858 (zImage) directly from ROM or flash. If unsure, say N.
859
860config CMDLINE
861 string "Default kernel command string"
862 default ""
863 help
864 On some architectures (EBSA110 and CATS), there is currently no way
865 for the boot loader to pass arguments to the kernel. For these
866 architectures, you should supply some command-line options at build
867 time by entering them here. As a minimum, you should specify the
868 memory size and the root device (e.g., mem=64M root=/dev/nfs).
869
870config XIP_KERNEL
871 bool "Kernel Execute-In-Place from ROM"
872 depends on !ZBOOT_ROM
873 help
874 Execute-In-Place allows the kernel to run from non-volatile storage
875 directly addressable by the CPU, such as NOR flash. This saves RAM
876 space since the text section of the kernel is not loaded from flash
877 to RAM. Read-write sections, such as the data section and stack,
878 are still copied to RAM. The XIP kernel is not compressed since
879 it has to run directly from flash, so it will take more space to
880 store it. The flash address used to link the kernel object files,
881 and for storing it, is configuration dependent. Therefore, if you
882 say Y here, you must know the proper physical address where to
883 store the kernel image depending on your own flash memory usage.
884
885 Also note that the make target becomes "make xipImage" rather than
886 "make zImage" or "make Image". The final kernel binary to put in
887 ROM memory will be arch/arm/boot/xipImage.
888
889 If unsure, say N.
890
891config XIP_PHYS_ADDR
892 hex "XIP Kernel Physical Location"
893 depends on XIP_KERNEL
894 default "0x00080000"
895 help
896 This is the physical address in your flash memory the kernel will
897 be linked for and stored to. This address is dependent on your
898 own flash usage.
899
c587e4a6
RP
900config KEXEC
901 bool "Kexec system call (EXPERIMENTAL)"
902 depends on EXPERIMENTAL
903 help
904 kexec is a system call that implements the ability to shutdown your
905 current kernel, and to start another kernel. It is like a reboot
01dd2fbf 906 but it is independent of the system firmware. And like a reboot
c587e4a6
RP
907 you can start any kernel with it, not just Linux.
908
909 It is an ongoing process to be certain the hardware in a machine
910 is properly shutdown, so do not be surprised if this code does not
911 initially work for you. It may help to enable device hotplugging
912 support.
913
1da177e4
LT
914endmenu
915
9e2697ff 916if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1da177e4
LT
917
918menu "CPU Frequency scaling"
919
920source "drivers/cpufreq/Kconfig"
921
922config CPU_FREQ_SA1100
923 bool
07c6d48f 924 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1da177e4
LT
925 default y
926
927config CPU_FREQ_SA1110
928 bool
929 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
930 default y
931
932config CPU_FREQ_INTEGRATOR
933 tristate "CPUfreq driver for ARM Integrator CPUs"
934 depends on ARCH_INTEGRATOR && CPU_FREQ
935 default y
936 help
937 This enables the CPUfreq driver for ARM Integrator CPUs.
938
939 For details, take a look at <file:Documentation/cpu-freq>.
940
941 If in doubt, say Y.
942
3c8cd0cc
PP
943config CPU_FREQ_IMX
944 tristate "CPUfreq driver for i.MX CPUs"
945 depends on ARCH_IMX && CPU_FREQ
946 default n
947 help
948 This enables the CPUfreq driver for i.MX CPUs.
949
950 If in doubt, say N.
951
9e2697ff
RK
952config CPU_FREQ_PXA
953 bool
954 depends on CPU_FREQ && ARCH_PXA && PXA25x
955 default y
956 select CPU_FREQ_DEFAULT_GOV_USERSPACE
957
1da177e4
LT
958endmenu
959
960endif
961
962menu "Floating point emulation"
963
964comment "At least one emulation must be selected"
965
966config FPE_NWFPE
967 bool "NWFPE math emulation"
8993a44c 968 depends on !AEABI || OABI_COMPAT
1da177e4
LT
969 ---help---
970 Say Y to include the NWFPE floating point emulator in the kernel.
971 This is necessary to run most binaries. Linux does not currently
972 support floating point hardware so you need to say Y here even if
973 your machine has an FPA or floating point co-processor podule.
974
975 You may say N here if you are going to load the Acorn FPEmulator
976 early in the bootup.
977
978config FPE_NWFPE_XP
979 bool "Support extended precision"
bedf142b 980 depends on FPE_NWFPE
1da177e4
LT
981 help
982 Say Y to include 80-bit support in the kernel floating-point
983 emulator. Otherwise, only 32 and 64-bit support is compiled in.
984 Note that gcc does not generate 80-bit operations by default,
985 so in most cases this option only enlarges the size of the
986 floating point emulator without any good reason.
987
988 You almost surely want to say N here.
989
990config FPE_FASTFPE
991 bool "FastFPE math emulation (EXPERIMENTAL)"
8993a44c 992 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1da177e4
LT
993 ---help---
994 Say Y here to include the FAST floating point emulator in the kernel.
995 This is an experimental much faster emulator which now also has full
996 precision for the mantissa. It does not support any exceptions.
997 It is very simple, and approximately 3-6 times faster than NWFPE.
998
999 It should be sufficient for most programs. It may be not suitable
1000 for scientific calculations, but you have to check this for yourself.
1001 If you do not feel you need a faster FP emulation you should better
1002 choose NWFPE.
1003
1004config VFP
1005 bool "VFP-format floating point maths"
c00d4ffd 1006 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1da177e4
LT
1007 help
1008 Say Y to include VFP support code in the kernel. This is needed
1009 if your hardware includes a VFP unit.
1010
1011 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1012 release notes and additional status information.
1013
1014 Say N if your target does not have VFP hardware.
1015
25ebee02
CM
1016config VFPv3
1017 bool
1018 depends on VFP
1019 default y if CPU_V7
1020
b5872db4
CM
1021config NEON
1022 bool "Advanced SIMD (NEON) Extension support"
1023 depends on VFPv3 && CPU_V7
1024 help
1025 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1026 Extension.
1027
1da177e4
LT
1028endmenu
1029
1030menu "Userspace binary formats"
1031
1032source "fs/Kconfig.binfmt"
1033
1034config ARTHUR
1035 tristate "RISC OS personality"
704bdda0 1036 depends on !AEABI
1da177e4
LT
1037 help
1038 Say Y here to include the kernel code necessary if you want to run
1039 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1040 experimental; if this sounds frightening, say N and sleep in peace.
1041 You can also say M here to compile this support as a module (which
1042 will be called arthur).
1043
1044endmenu
1045
1046menu "Power management options"
1047
eceab4ac 1048source "kernel/power/Kconfig"
1da177e4 1049
f4cb5700
JB
1050config ARCH_SUSPEND_POSSIBLE
1051 def_bool y
1052
1da177e4
LT
1053endmenu
1054
d5950b43
SR
1055source "net/Kconfig"
1056
1da177e4
LT
1057menu "Device Drivers"
1058
1059source "drivers/base/Kconfig"
1060
c35bf4a5
PM
1061source "drivers/connector/Kconfig"
1062
f12d0d7c 1063if ALIGNMENT_TRAP || !CPU_CP15_MMU
1da177e4
LT
1064source "drivers/mtd/Kconfig"
1065endif
1066
1067source "drivers/parport/Kconfig"
1068
1069source "drivers/pnp/Kconfig"
1070
1071source "drivers/block/Kconfig"
1072
58273e55
RK
1073# misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1074
1075source "drivers/misc/Kconfig"
1076
3f7e5815 1077if PCMCIA || ARCH_CLPS7500 || ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX \
bb011b8e 1078 || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
c4713074
LB
1079 || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
1080 || ARCH_IXP23XX
1da177e4
LT
1081source "drivers/ide/Kconfig"
1082endif
1083
1084source "drivers/scsi/Kconfig"
1085
eb370f0b
MM
1086source "drivers/ata/Kconfig"
1087
1da177e4
LT
1088source "drivers/md/Kconfig"
1089
1090source "drivers/message/fusion/Kconfig"
1091
1092source "drivers/ieee1394/Kconfig"
1093
1094source "drivers/message/i2o/Kconfig"
1095
d5950b43 1096source "drivers/net/Kconfig"
1da177e4
LT
1097
1098source "drivers/isdn/Kconfig"
1099
1100# input before char - char/joystick depends on it. As does USB.
1101
1102source "drivers/input/Kconfig"
1103
1104source "drivers/char/Kconfig"
1105
1106source "drivers/i2c/Kconfig"
1107
8ae12a0d
DB
1108source "drivers/spi/Kconfig"
1109
04916c0e
AZ
1110source "drivers/w1/Kconfig"
1111
58273e55
RK
1112source "drivers/power/Kconfig"
1113
ad2f931d
JD
1114source "drivers/hwmon/Kconfig"
1115
70dfa3f8
RK
1116source "drivers/watchdog/Kconfig"
1117
58273e55 1118source "drivers/ssb/Kconfig"
1da177e4 1119
58273e55 1120#source "drivers/l3/Kconfig"
1da177e4 1121
a4e137ab
RK
1122source "drivers/mfd/Kconfig"
1123
1da177e4
LT
1124source "drivers/media/Kconfig"
1125
1126source "drivers/video/Kconfig"
1127
1128source "sound/Kconfig"
1129
c2dade51
SH
1130source "drivers/hid/Kconfig"
1131
1da177e4
LT
1132source "drivers/usb/Kconfig"
1133
1134source "drivers/mmc/Kconfig"
1135
58273e55
RK
1136source "drivers/leds/Kconfig"
1137
12b824fb
AZ
1138source "drivers/rtc/Kconfig"
1139
5816815f
DW
1140source "drivers/dma/Kconfig"
1141
abf07b19
DW
1142source "drivers/dca/Kconfig"
1143
1da177e4
LT
1144endmenu
1145
1146source "fs/Kconfig"
1147
c0ffa3a9 1148source "kernel/Kconfig.instrumentation"
1da177e4
LT
1149
1150source "arch/arm/Kconfig.debug"
1151
1152source "security/Kconfig"
1153
1154source "crypto/Kconfig"
1155
1156source "lib/Kconfig"