Kconfig 29.1 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
6
7
8
9
10
#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#

mainmenu "Linux Kernel Configuration"

config ARM
	bool
	default y
11
	select RTC_LIB
12
	select SYS_SUPPORTS_APM_EMULATION
Linus Torvalds's avatar
Linus Torvalds committed
13
14
	help
	  The ARM series is a line of low-power-consumption RISC chip designs
15
	  licensed by ARM Ltd and targeted at embedded applications and
Linus Torvalds's avatar
Linus Torvalds committed
16
	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
17
	  manufactured, but legacy ARM-based PC hardware remains popular in
Linus Torvalds's avatar
Linus Torvalds committed
18
19
20
	  Europe.  There is an ARM Linux project with a web page at
	  <http://www.arm.linux.org.uk/>.

21
22
23
config SYS_SUPPORTS_APM_EMULATION
	bool

24
25
26
27
config GENERIC_GPIO
	bool
	default n

28
29
30
31
config GENERIC_TIME
	bool
	default n

32
33
34
35
config GENERIC_CLOCKEVENTS
	bool
	default n

Linus Torvalds's avatar
Linus Torvalds committed
36
37
38
39
config MMU
	bool
	default y

Al Viro's avatar
Al Viro committed
40
41
42
43
config NO_IOPORT
	bool
	default n

Linus Torvalds's avatar
Linus Torvalds committed
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
config EISA
	bool
	---help---
	  The Extended Industry Standard Architecture (EISA) bus was
	  developed as an open alternative to the IBM MicroChannel bus.

	  The EISA bus provided some of the features of the IBM MicroChannel
	  bus while maintaining backward compatibility with cards made for
	  the older ISA bus.  The EISA bus saw limited use between 1988 and
	  1995 when it was made obsolete by the PCI bus.

	  Say Y here if you are building a kernel for an EISA-based machine.

	  Otherwise, say N.

config SBUS
	bool

config MCA
	bool
	help
	  MicroChannel Architecture is found in some IBM PS/2 machines and
	  laptops.  It is a bus system similar to PCI or ISA. See
	  <file:Documentation/mca.txt> (and especially the web page given
	  there) before attempting to build an MCA bus kernel.

70
71
72
73
config GENERIC_HARDIRQS
	bool
	default y

74
75
76
77
78
79
80
81
config STACKTRACE_SUPPORT
	bool
	default y

config LOCKDEP_SUPPORT
	bool
	default y

Russell King's avatar
Russell King committed
82
83
84
85
config TRACE_IRQFLAGS_SUPPORT
	bool
	default y

86
87
88
89
90
91
92
93
config HARDIRQS_SW_RESEND
	bool
	default y

config GENERIC_IRQ_PROBE
	bool
	default y

Nick Piggin's avatar
Nick Piggin committed
94
95
96
97
98
config GENERIC_LOCKBREAK
	bool
	default y
	depends on SMP && PREEMPT

Linus Torvalds's avatar
Linus Torvalds committed
99
100
101
102
103
104
105
config RWSEM_GENERIC_SPINLOCK
	bool
	default y

config RWSEM_XCHGADD_ALGORITHM
	bool

106
107
108
109
110
111
112
113
config ARCH_HAS_ILOG2_U32
	bool
	default n

config ARCH_HAS_ILOG2_U64
	bool
	default n

114
115
116
117
config GENERIC_HWEIGHT
	bool
	default y

Linus Torvalds's avatar
Linus Torvalds committed
118
119
120
121
config GENERIC_CALIBRATE_DELAY
	bool
	default y

122
123
124
config ARCH_MAY_HAVE_PC_FDC
	bool

125
126
127
128
config ZONE_DMA
	bool
	default y

Linus Torvalds's avatar
Linus Torvalds committed
129
130
131
132
133
134
config GENERIC_ISA_DMA
	bool

config FIQ
	bool

135
136
137
config ARCH_MTD_XIP
	bool

138
139
config VECTORS_BASE
	hex
140
	default 0xffff0000 if MMU || CPU_HIGH_VECTOR
141
142
143
144
145
	default DRAM_BASE if REMAP_VECTORS_TO_RAM
	default 0x00000000
	help
	  The base address of exception vectors.

Linus Torvalds's avatar
Linus Torvalds committed
146
147
148
149
150
151
source "init/Kconfig"

menu "System Type"

choice
	prompt "ARM system type"
152
	default ARCH_VERSATILE
Linus Torvalds's avatar
Linus Torvalds committed
153

154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
config ARCH_AAEC2000
	bool "Agilent AAEC-2000 based"
	select ARM_AMBA
	help
	  This enables support for systems based on the Agilent AAEC-2000

config ARCH_INTEGRATOR
	bool "ARM Ltd. Integrator family"
	select ARM_AMBA
	select ICST525
	help
	  Support for ARM's Integrator platform.

config ARCH_REALVIEW
	bool "ARM Ltd. RealView family"
	select ARM_AMBA
	select ICST307
171
	select GENERIC_TIME
172
	select GENERIC_CLOCKEVENTS
173
174
175
176
177
178
179
180
	help
	  This enables support for ARM Ltd RealView boards.

config ARCH_VERSATILE
	bool "ARM Ltd. Versatile family"
	select ARM_AMBA
	select ARM_VIC
	select ICST307
181
	select GENERIC_TIME
182
	select GENERIC_CLOCKEVENTS
183
184
185
	help
	  This enables support for ARM Ltd Versatile board.

186
187
config ARCH_AT91
	bool "Atmel AT91"
188
	select GENERIC_GPIO
189
	help
190
191
	  This enables support for systems based on the Atmel AT91RM9200,
	  AT91SAM9 and AT91CAP9 processors.
192

Linus Torvalds's avatar
Linus Torvalds committed
193
config ARCH_CLPS7500
194
	bool "Cirrus CL-PS7500FE"
Linus Torvalds's avatar
Linus Torvalds committed
195
	select TIMER_ACORN
196
	select ISA
197
	select NO_IOPORT
198
199
	help
	  Support for the Cirrus Logic PS7500FE system-on-a-chip.
Linus Torvalds's avatar
Linus Torvalds committed
200
201

config ARCH_CLPS711X
202
	bool "Cirrus Logic CLPS711x/EP721x-based"
203
204
	help
	  Support for Cirrus Logic 711x/721x based boards.
Linus Torvalds's avatar
Linus Torvalds committed
205
206
207
208
209

config ARCH_CO285
	bool "Co-EBSA285"
	select FOOTBRIDGE
	select FOOTBRIDGE_ADDIN
210
211
	help
	  Support for Intel's EBSA285 companion chip.
Linus Torvalds's avatar
Linus Torvalds committed
212
213
214

config ARCH_EBSA110
	bool "EBSA-110"
215
	select ISA
216
	select NO_IOPORT
Linus Torvalds's avatar
Linus Torvalds committed
217
218
	help
	  This is an evaluation board for the StrongARM processor available
219
	  from Digital. It has limited hardware on-board, including an
Linus Torvalds's avatar
Linus Torvalds committed
220
221
222
	  Ethernet interface, two PCMCIA sockets, two serial ports and a
	  parallel port.

223
224
225
226
config ARCH_EP93XX
	bool "EP93xx-based"
	select ARM_AMBA
	select ARM_VIC
227
	select GENERIC_GPIO
228
229
230
	help
	  This enables support for the Cirrus EP93xx series of CPUs.

Linus Torvalds's avatar
Linus Torvalds committed
231
232
233
config ARCH_FOOTBRIDGE
	bool "FootBridge"
	select FOOTBRIDGE
234
235
236
	help
	  Support for systems based on the DC21285 companion chip
	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
Linus Torvalds's avatar
Linus Torvalds committed
237

238
239
240
config ARCH_NETX
	bool "Hilscher NetX based"
	select ARM_VIC
241
	help
242
243
244
245
246
247
248
249
250
251
	  This enables support for systems based on the Hilscher NetX Soc

config ARCH_H720X
	bool "Hynix HMS720x-based"
	select ISA_DMA_API
	help
	  This enables support for systems based on the Hynix HMS720x

config ARCH_IMX
	bool "IMX"
252
	select GENERIC_GPIO
253
254
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
255
256
	help
	  Support for Motorola's i.MX family of processors (MX1, MXL).
Linus Torvalds's avatar
Linus Torvalds committed
257

258
259
260
261
262
263
264
265
266
config ARCH_IOP13XX
	bool "IOP13xx-based"
	depends on MMU
	select PLAT_IOP
	select PCI
	select ARCH_SUPPORTS_MSI
	help
	  Support for Intel's IOP13XX (XScale) family of processors.

267
268
config ARCH_IOP32X
	bool "IOP32x-based"
269
	depends on MMU
270
	select PLAT_IOP
271
	select PCI
272
	help
273
274
275
276
277
278
	  Support for Intel's 80219 and IOP32X (XScale) family of
	  processors.

config ARCH_IOP33X
	bool "IOP33x-based"
	depends on MMU
279
	select PLAT_IOP
280
281
282
	select PCI
	help
	  Support for Intel's IOP33X (XScale) family of processors.
Linus Torvalds's avatar
Linus Torvalds committed
283

284
285
config ARCH_IXP23XX
 	bool "IXP23XX-based"
286
	depends on MMU
287
 	select PCI
288
	help
289
	  Support for Intel's IXP23xx (XScale) family of processors.
Linus Torvalds's avatar
Linus Torvalds committed
290
291
292

config ARCH_IXP2000
	bool "IXP2400/2800-based"
293
	depends on MMU
294
	select PCI
295
296
	help
	  Support for Intel's IXP2400/2800 (XScale) family of processors.
Linus Torvalds's avatar
Linus Torvalds committed
297

298
299
config ARCH_IXP4XX
	bool "IXP4xx-based"
300
	depends on MMU
301
	select GENERIC_GPIO
302
303
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
304
	help
305
	  Support for Intel's IXP4XX (XScale) family of processors.
306

Linus Torvalds's avatar
Linus Torvalds committed
307
308
309
310
311
312
313
314
315
316
317
318
319
config ARCH_L7200
	bool "LinkUp-L7200"
	select FIQ
	help
	  Say Y here if you intend to run this kernel on a LinkUp Systems
	  L7200 Software Development Board which uses an ARM720T processor.
	  Information on this board can be obtained at:

	  <http://www.linkupsys.com/>

	  If you have any questions or comments about the Linux kernel port
	  to this board, send e-mail to <sjhill@cotw.com>.

320
321
config ARCH_KS8695
	bool "Micrel/Kendin KS8695"
322
	select GENERIC_GPIO
323
324
325
326
	help
	  Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
	  System-on-Chip devices.

327
328
config ARCH_NS9XXX
	bool "NetSilicon NS9xxx"
329
	select GENERIC_GPIO
330
	select GENERIC_TIME
331
	select GENERIC_CLOCKEVENTS
332
333
334
335
336
337
	help
	  Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
	  System.

	  <http://www.digi.com/products/microprocessors/index.jsp>

338
339
340
341
342
343
config ARCH_MXC
	bool "Freescale MXC/iMX-based"
	select ARCH_MTD_XIP
	help
	  Support for Freescale MXC/iMX-based family of processors

344
345
346
config ARCH_ORION
	bool "Marvell Orion"
	depends on MMU
Tzachi Perelstein's avatar
Tzachi Perelstein committed
347
	select PCI
Tzachi Perelstein's avatar
Tzachi Perelstein committed
348
	select GENERIC_GPIO
349
350
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
351
352
353
	help
	  Support for Marvell Orion System on Chip family.

354
355
356
357
358
config ARCH_PNX4008
	bool "Philips Nexperia PNX4008 Mobile"
	help
	  This enables support for Philips PNX4008 mobile platform.

Linus Torvalds's avatar
Linus Torvalds committed
359
config ARCH_PXA
eric miao's avatar
eric miao committed
360
	bool "PXA2xx/PXA3xx-based"
361
	depends on MMU
362
	select ARCH_MTD_XIP
363
	select GENERIC_GPIO
364
	select GENERIC_TIME
365
	select GENERIC_CLOCKEVENTS
366
	select TICK_ONESHOT
367
	help
eric miao's avatar
eric miao committed
368
	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
Linus Torvalds's avatar
Linus Torvalds committed
369
370
371
372
373
374

config ARCH_RPC
	bool "RiscPC"
	select ARCH_ACORN
	select FIQ
	select TIMER_ACORN
375
	select ARCH_MAY_HAVE_PC_FDC
376
	select ISA_DMA_API
Al Viro's avatar
Al Viro committed
377
	select NO_IOPORT
Linus Torvalds's avatar
Linus Torvalds committed
378
379
380
381
382
383
	help
	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
	  CD-ROM interface, serial and parallel port, and the floppy drive.

config ARCH_SA1100
	bool "SA1100-based"
384
	select ISA
Russell King's avatar
Russell King committed
385
	select ARCH_DISCONTIGMEM_ENABLE
386
	select ARCH_MTD_XIP
387
	select GENERIC_GPIO
388
	select GENERIC_TIME
389
390
	help
	  Support for StrongARM 11x0 based boards.
Linus Torvalds's avatar
Linus Torvalds committed
391
392

config ARCH_S3C2410
393
	bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
394
	select GENERIC_GPIO
Linus Torvalds's avatar
Linus Torvalds committed
395
396
397
	help
	  Samsung S3C2410X CPU based systems, such as the Simtec Electronics
	  BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
398
	  the Samsung SMDK2410 development board (and derivatives).
Linus Torvalds's avatar
Linus Torvalds committed
399
400
401

config ARCH_SHARK
	bool "Shark"
402
403
404
	select ISA
	select ISA_DMA
	select PCI
405
406
407
	help
	  Support for the StrongARM based Digital DNARD machine, also known
	  as "Shark" (<http://www.shark-linux.de/shark.html>).
Linus Torvalds's avatar
Linus Torvalds committed
408
409
410
411
412
413
414
415
416

config ARCH_LH7A40X
	bool "Sharp LH7A40X"
	help
	  Say Y here for systems based on one of the Sharp LH7A40X
	  System on a Chip processors.  These CPUs include an ARM922T
	  core with a wide array of integrated devices for
	  hand-held and low-power applications.

417
418
419
420
config ARCH_DAVINCI
	bool "TI DaVinci"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
421
	select GENERIC_GPIO
422
423
424
	help
	  Support for TI's DaVinci platform.

425
426
427
428
429
430
431
config ARCH_OMAP
	bool "TI OMAP"
	select GENERIC_GPIO
	select GENERIC_TIME
	help
	  Support for TI's OMAP platform (OMAP1 and OMAP2).

432
433
434
435
436
437
438
439
440
441
442
config ARCH_MSM7X00A
	bool "Qualcomm MSM7X00A"
	select GENERIC_TIME
	select GENERIC_CLOCKEVENTS
	help
	  Support for Qualcomm MSM7X00A based systems.  This runs on the ARM11
	  apps processor of the MSM7X00A and depends on a shared memory
	  interface to the ARM9 modem processor which runs the baseband stack
	  and controls some vital subsystems (clock and power control, etc).
	  <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>

Linus Torvalds's avatar
Linus Torvalds committed
443
444
445
446
endchoice

source "arch/arm/mach-clps711x/Kconfig"

447
448
source "arch/arm/mach-ep93xx/Kconfig"

Linus Torvalds's avatar
Linus Torvalds committed
449
450
451
452
source "arch/arm/mach-footbridge/Kconfig"

source "arch/arm/mach-integrator/Kconfig"

453
454
455
source "arch/arm/mach-iop32x/Kconfig"

source "arch/arm/mach-iop33x/Kconfig"
Linus Torvalds's avatar
Linus Torvalds committed
456

457
458
source "arch/arm/mach-iop13xx/Kconfig"

Linus Torvalds's avatar
Linus Torvalds committed
459
460
461
462
source "arch/arm/mach-ixp4xx/Kconfig"

source "arch/arm/mach-ixp2000/Kconfig"

463
464
source "arch/arm/mach-ixp23xx/Kconfig"

Linus Torvalds's avatar
Linus Torvalds committed
465
466
467
468
source "arch/arm/mach-pxa/Kconfig"

source "arch/arm/mach-sa1100/Kconfig"

469
470
471
source "arch/arm/plat-omap/Kconfig"

source "arch/arm/mach-omap1/Kconfig"
Linus Torvalds's avatar
Linus Torvalds committed
472

473
474
source "arch/arm/mach-omap2/Kconfig"

475
476
source "arch/arm/mach-orion/Kconfig"

477
source "arch/arm/plat-s3c24xx/Kconfig"
478
source "arch/arm/plat-s3c/Kconfig"
479
480
481

if ARCH_S3C2410
source "arch/arm/mach-s3c2400/Kconfig"
Linus Torvalds's avatar
Linus Torvalds committed
482
source "arch/arm/mach-s3c2410/Kconfig"
483
484
485
source "arch/arm/mach-s3c2412/Kconfig"
source "arch/arm/mach-s3c2440/Kconfig"
source "arch/arm/mach-s3c2442/Kconfig"
486
source "arch/arm/mach-s3c2443/Kconfig"
487
endif
Linus Torvalds's avatar
Linus Torvalds committed
488
489
490
491
492
493
494
495
496

source "arch/arm/mach-lh7a40x/Kconfig"

source "arch/arm/mach-imx/Kconfig"

source "arch/arm/mach-h720x/Kconfig"

source "arch/arm/mach-versatile/Kconfig"

497
498
source "arch/arm/mach-aaec2000/Kconfig"

499
500
source "arch/arm/mach-realview/Kconfig"

501
source "arch/arm/mach-at91/Kconfig"
502

503
504
source "arch/arm/plat-mxc/Kconfig"

505
506
source "arch/arm/mach-netx/Kconfig"

507
508
source "arch/arm/mach-ns9xxx/Kconfig"

509
510
source "arch/arm/mach-davinci/Kconfig"

511
512
source "arch/arm/mach-ks8695/Kconfig"

513
514
source "arch/arm/mach-msm/Kconfig"

Linus Torvalds's avatar
Linus Torvalds committed
515
516
517
518
# Definitions to make life easier
config ARCH_ACORN
	bool

519
520
521
config PLAT_IOP
	bool

Linus Torvalds's avatar
Linus Torvalds committed
522
523
source arch/arm/mm/Kconfig

524
525
config IWMMXT
	bool "Enable iWMMXt support"
526
	depends on CPU_XSCALE || CPU_XSC3
eric miao's avatar
eric miao committed
527
	default y if PXA27x || PXA3xx
528
529
530
531
	help
	  Enable support for iWMMXt context switching at run time if
	  running on a CPU that supports it.

Linus Torvalds's avatar
Linus Torvalds committed
532
533
534
535
536
537
#  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
config XSCALE_PMU
	bool
	depends on CPU_XSCALE && !XSCALE_PMU_TIMER
	default y

538
539
540
541
if !MMU
source "arch/arm/Kconfig-nommu"
endif

Linus Torvalds's avatar
Linus Torvalds committed
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
endmenu

source "arch/arm/common/Kconfig"

config FORCE_MAX_ZONEORDER
	int
	depends on SA1111
	default "9"

menu "Bus support"

config ARM_AMBA
	bool

config ISA
	bool
	help
	  Find out whether you have ISA slots on your motherboard.  ISA is the
	  name of a bus system, i.e. the way the CPU talks to the other stuff
	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
	  newer boards don't support it.  If you have ISA, say Y, otherwise N.

565
# Select ISA DMA controller support
Linus Torvalds's avatar
Linus Torvalds committed
566
567
config ISA_DMA
	bool
568
	select ISA_DMA_API
Linus Torvalds's avatar
Linus Torvalds committed
569

570
# Select ISA DMA interface
571
572
573
config ISA_DMA_API
	bool

Linus Torvalds's avatar
Linus Torvalds committed
574
config PCI
Mike Rapoport's avatar
Mike Rapoport committed
575
	bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
Linus Torvalds's avatar
Linus Torvalds committed
576
577
578
579
580
581
	help
	  Find out whether you have a PCI motherboard. PCI is the name of a
	  bus system, i.e. the way the CPU talks to the other stuff inside
	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
	  VESA. If you have PCI, say Y, otherwise N.

582
583
584
config PCI_SYSCALL
	def_bool PCI

Linus Torvalds's avatar
Linus Torvalds committed
585
586
587
588
589
590
# Select the host bridge type
config PCI_HOST_VIA82C505
	bool
	depends on PCI && ARCH_SHARK
	default y

Mike Rapoport's avatar
Mike Rapoport committed
591
592
593
594
595
596
config PCI_HOST_ITE8152
	bool
	depends on PCI && MACH_ARMCORE
	default y
	select DMABOUNCE

Linus Torvalds's avatar
Linus Torvalds committed
597
598
599
600
601
602
603
604
source "drivers/pci/Kconfig"

source "drivers/pcmcia/Kconfig"

endmenu

menu "Kernel Features"

605
606
source "kernel/time/Kconfig"

Linus Torvalds's avatar
Linus Torvalds committed
607
608
config SMP
	bool "Symmetric Multi-Processing (EXPERIMENTAL)"
609
	depends on EXPERIMENTAL && REALVIEW_MPCORE
Linus Torvalds's avatar
Linus Torvalds committed
610
611
612
613
614
615
616
617
618
619
620
	help
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, like most personal computers, say N. If
	  you have a system with more than one CPU, say Y.

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on many, but not all, single
	  processor machines. On a single processor machine, the kernel will
	  run faster if you say N here.

621
622
	  See also the <file:Documentation/smp.txt>,
	  <file:Documentation/i386/IO-APIC.txt>,
Linus Torvalds's avatar
Linus Torvalds committed
623
624
625
626
627
628
629
630
631
632
633
	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
	  <http://www.linuxdoc.org/docs.html#howto>.

	  If you don't know what to do here, say N.

config NR_CPUS
	int "Maximum number of CPUs (2-32)"
	range 2 32
	depends on SMP
	default "4"

634
635
636
637
638
639
640
config HOTPLUG_CPU
	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
	depends on SMP && HOTPLUG && EXPERIMENTAL
	help
	  Say Y here to experiment with turning CPUs off and on.  CPUs
	  can be controlled through /sys/devices/system/cpu.

641
642
config LOCAL_TIMERS
	bool "Use local timer interrupts"
643
	depends on SMP && REALVIEW_MPCORE
644
645
646
647
648
649
650
	default y
	help
	  Enable support for local timers on SMP platforms, rather then the
	  legacy IPI broadcast method.  Local timers allows the system
	  accounting to be spread across the timer interval, preventing a
	  "thundering herd" at every timer tick.

Linus Torvalds's avatar
Linus Torvalds committed
651
652
653
654
655
656
657
658
659
660
661
662
663
config PREEMPT
	bool "Preemptible Kernel (EXPERIMENTAL)"
	depends on EXPERIMENTAL
	help
	  This option reduces the latency of the kernel when reacting to
	  real-time or interactive events by allowing a low priority process to
	  be preempted even if it is in kernel mode executing a system call.
	  This allows applications to run more reliably even when the system is
	  under load.

	  Say Y here if you are building a kernel for a desktop, embedded
	  or real-time system.  Say N if you are unsure.

664
665
config NO_IDLE_HZ
	bool "Dynamic tick timer"
666
	depends on !GENERIC_CLOCKEVENTS
667
668
669
670
671
672
673
674
675
676
677
678
679
	help
	  Select this option if you want to disable continuous timer ticks
	  and have them programmed to occur as required. This option saves
	  power as the system can remain in idle state for longer.

	  By default dynamic tick is disabled during the boot, and can be
	  manually enabled with:

	    echo 1 > /sys/devices/system/timer/timer0/dyn_tick

	  Alternatively, if you want dynamic tick automatically enabled
	  during boot, pass "dyntick=enable" via the kernel command string.

680
681
	  Please note that dynamic tick may affect the accuracy of
	  timekeeping on some platforms depending on the implementation.
682
683
	  Currently at least OMAP, PXA2xx and SA11x0 platforms are known
	  to have accurate timekeeping with dynamic tick.
684

685
686
687
688
config HZ
	int
	default 128 if ARCH_L7200
	default 200 if ARCH_EBSA110 || ARCH_S3C2410
689
	default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
690
	default AT91_TIMER_HZ if ARCH_AT91
691
692
	default 100

693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
config AEABI
	bool "Use the ARM EABI to compile the kernel"
	help
	  This option allows for the kernel to be compiled using the latest
	  ARM ABI (aka EABI).  This is only useful if you are using a user
	  space environment that is also compiled with EABI.

	  Since there are major incompatibilities between the legacy ABI and
	  EABI, especially with regard to structure member alignment, this
	  option also changes the kernel syscall calling convention to
	  disambiguate both ABIs and allow for backward compatibility support
	  (selected with CONFIG_OABI_COMPAT).

	  To use this you need GCC version 4.0.0 or later.

708
config OABI_COMPAT
709
	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
710
	depends on AEABI && EXPERIMENTAL
711
712
713
714
715
716
717
718
719
720
721
722
723
724
	default y
	help
	  This option preserves the old syscall interface along with the
	  new (ARM EABI) one. It also provides a compatibility layer to
	  intercept syscalls that have structure arguments which layout
	  in memory differs between the legacy ABI and the new ARM EABI
	  (only for non "thumb" binaries). This option adds a tiny
	  overhead to all syscalls and produces a slightly larger kernel.
	  If you know you'll be using only pure EABI user space then you
	  can say N here. If this option is not selected and you attempt
	  to execute a legacy ABI binary then the result will be
	  UNPREDICTABLE (in fact it can be predicted that it won't work
	  at all). If in doubt say Y.

725
config ARCH_DISCONTIGMEM_ENABLE
Linus Torvalds's avatar
Linus Torvalds committed
726
	bool
727
	default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
Linus Torvalds's avatar
Linus Torvalds committed
728
729
730
731
732
733
	help
	  Say Y to support efficient handling of discontiguous physical memory,
	  for architectures which are either NUMA (Non-Uniform Memory Access)
	  or have huge holes in the physical address space for other reasons.
	  See <file:Documentation/vm/numa> for more.

734
735
736
737
738
739
config NODES_SHIFT
	int
	default "4" if ARCH_LH7A40X
	default "2"
	depends on NEED_MULTIPLE_NODES

740
741
source "mm/Kconfig"

Linus Torvalds's avatar
Linus Torvalds committed
742
743
744
745
746
747
config LEDS
	bool "Timer and CPU usage LEDs"
	depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
		   ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
		   ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
		   ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
748
		   ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
749
		   ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
750
		   ARCH_KS8695 || MACH_RD88F5182
Linus Torvalds's avatar
Linus Torvalds committed
751
752
753
754
755
756
757
758
759
760
761
762
763
	help
	  If you say Y here, the LEDs on your machine will be used
	  to provide useful information about your current system status.

	  If you are compiling a kernel for a NetWinder or EBSA-285, you will
	  be able to select which LEDs are active using the options below. If
	  you are compiling a kernel for the EBSA-110 or the LART however, the
	  red LED will simply flash regularly to indicate that the system is
	  still functional. It is safe to say Y here if you have a CATS
	  system, but the driver will do nothing.

config LEDS_TIMER
	bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
David Brownell's avatar
David Brownell committed
764
765
			    OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
			    || MACH_OMAP_PERSEUS2
Linus Torvalds's avatar
Linus Torvalds committed
766
	depends on LEDS
767
	depends on !GENERIC_CLOCKEVENTS
Linus Torvalds's avatar
Linus Torvalds committed
768
769
770
771
772
773
774
775
776
777
778
779
780
781
	default y if ARCH_EBSA110
	help
	  If you say Y here, one of the system LEDs (the green one on the
	  NetWinder, the amber one on the EBSA285, or the red one on the LART)
	  will flash regularly to indicate that the system is still
	  operational. This is mainly useful to kernel hackers who are
	  debugging unstable kernels.

	  The LART uses the same LED for both Timer LED and CPU usage LED
	  functions. You may choose to use both, but the Timer LED function
	  will overrule the CPU usage LED.

config LEDS_CPU
	bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
David Brownell's avatar
David Brownell committed
782
783
784
			!ARCH_OMAP) \
			|| OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
			|| MACH_OMAP_PERSEUS2
Linus Torvalds's avatar
Linus Torvalds committed
785
786
787
788
789
790
791
792
793
794
795
796
	depends on LEDS
	help
	  If you say Y here, the red LED will be used to give a good real
	  time indication of CPU usage, by lighting whenever the idle task
	  is not currently executing.

	  The LART uses the same LED for both Timer LED and CPU usage LED
	  functions. You may choose to use both, but the Timer LED function
	  will overrule the CPU usage LED.

config ALIGNMENT_TRAP
	bool
797
	depends on CPU_CP15_MMU
Linus Torvalds's avatar
Linus Torvalds committed
798
799
	default y if !ARCH_EBSA110
	help
800
	  ARM processors cannot fetch/store information which is not
Linus Torvalds's avatar
Linus Torvalds committed
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
	  address divisible by 4. On 32-bit ARM processors, these non-aligned
	  fetch/store instructions will be emulated in software if you say
	  here, which has a severe performance impact. This is necessary for
	  correct operation of some network protocols. With an IP-only
	  configuration it is safe to say N, otherwise say Y.

endmenu

menu "Boot options"

# Compressed boot loader in ROM.  Yes, we really want to ask about
# TEXT and BSS so we preserve their values in the config files.
config ZBOOT_ROM_TEXT
	hex "Compressed ROM boot loader base address"
	default "0"
	help
	  The physical address at which the ROM-able zImage is to be
	  placed in the target.  Platforms which normally make use of
	  ROM-able zImage formats normally set this to a suitable
	  value in their defconfig file.

	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM_BSS
	hex "Compressed ROM boot loader BSS address"
	default "0"
	help
829
830
831
832
833
834
	  The base address of an area of read/write memory in the target
	  for the ROM-able zImage which must be available while the
	  decompressor is running. It must be large enough to hold the
	  entire decompressed kernel plus an additional 128 KiB.
	  Platforms which normally make use of ROM-able zImage formats
	  normally set this to a suitable value in their defconfig file.
Linus Torvalds's avatar
Linus Torvalds committed
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884

	  If ZBOOT_ROM is not enabled, this has no effect.

config ZBOOT_ROM
	bool "Compressed boot loader in ROM/flash"
	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
	help
	  Say Y here if you intend to execute your compressed kernel image
	  (zImage) directly from ROM or flash.  If unsure, say N.

config CMDLINE
	string "Default kernel command string"
	default ""
	help
	  On some architectures (EBSA110 and CATS), there is currently no way
	  for the boot loader to pass arguments to the kernel. For these
	  architectures, you should supply some command-line options at build
	  time by entering them here. As a minimum, you should specify the
	  memory size and the root device (e.g., mem=64M root=/dev/nfs).

config XIP_KERNEL
	bool "Kernel Execute-In-Place from ROM"
	depends on !ZBOOT_ROM
	help
	  Execute-In-Place allows the kernel to run from non-volatile storage
	  directly addressable by the CPU, such as NOR flash. This saves RAM
	  space since the text section of the kernel is not loaded from flash
	  to RAM.  Read-write sections, such as the data section and stack,
	  are still copied to RAM.  The XIP kernel is not compressed since
	  it has to run directly from flash, so it will take more space to
	  store it.  The flash address used to link the kernel object files,
	  and for storing it, is configuration dependent. Therefore, if you
	  say Y here, you must know the proper physical address where to
	  store the kernel image depending on your own flash memory usage.

	  Also note that the make target becomes "make xipImage" rather than
	  "make zImage" or "make Image".  The final kernel binary to put in
	  ROM memory will be arch/arm/boot/xipImage.

	  If unsure, say N.

config XIP_PHYS_ADDR
	hex "XIP Kernel Physical Location"
	depends on XIP_KERNEL
	default "0x00080000"
	help
	  This is the physical address in your flash memory the kernel will
	  be linked for and stored to.  This address is dependent on your
	  own flash usage.

885
886
887
888
889
890
config KEXEC
	bool "Kexec system call (EXPERIMENTAL)"
	depends on EXPERIMENTAL
	help
	  kexec is a system call that implements the ability to shutdown your
	  current kernel, and to start another kernel.  It is like a reboot
Matt LaPlante's avatar
Matt LaPlante committed
891
	  but it is independent of the system firmware.   And like a reboot
892
893
894
895
896
897
898
	  you can start any kernel with it, not just Linux.

	  It is an ongoing process to be certain the hardware in a machine
	  is properly shutdown, so do not be surprised if this code does not
	  initially work for you.  It may help to enable device hotplugging
	  support.

Linus Torvalds's avatar
Linus Torvalds committed
899
900
endmenu

Russell King's avatar
Russell King committed
901
if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
Linus Torvalds's avatar
Linus Torvalds committed
902
903
904
905
906
907
908

menu "CPU Frequency scaling"

source "drivers/cpufreq/Kconfig"

config CPU_FREQ_SA1100
	bool
909
	depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
Linus Torvalds's avatar
Linus Torvalds committed
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
	default y

config CPU_FREQ_SA1110
	bool
	depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
	default y

config CPU_FREQ_INTEGRATOR
	tristate "CPUfreq driver for ARM Integrator CPUs"
	depends on ARCH_INTEGRATOR && CPU_FREQ
	default y
	help
	  This enables the CPUfreq driver for ARM Integrator CPUs.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say Y.

928
929
930
931
932
933
934
935
936
config CPU_FREQ_IMX
	tristate "CPUfreq driver for i.MX CPUs"
	depends on ARCH_IMX && CPU_FREQ
	default n
	help
	  This enables the CPUfreq driver for i.MX CPUs.

	  If in doubt, say N.

Russell King's avatar
Russell King committed
937
938
939
940
941
942
config CPU_FREQ_PXA
	bool
	depends on CPU_FREQ && ARCH_PXA && PXA25x
	default y
	select CPU_FREQ_DEFAULT_GOV_USERSPACE

Linus Torvalds's avatar
Linus Torvalds committed
943
944
945
946
947
948
949
950
951
952
endmenu

endif

menu "Floating point emulation"

comment "At least one emulation must be selected"

config FPE_NWFPE
	bool "NWFPE math emulation"
953
	depends on !AEABI || OABI_COMPAT
Linus Torvalds's avatar
Linus Torvalds committed
954
955
956
957
958
959
960
961
962
963
964
	---help---
	  Say Y to include the NWFPE floating point emulator in the kernel.
	  This is necessary to run most binaries. Linux does not currently
	  support floating point hardware so you need to say Y here even if
	  your machine has an FPA or floating point co-processor podule.

	  You may say N here if you are going to load the Acorn FPEmulator
	  early in the bootup.

config FPE_NWFPE_XP
	bool "Support extended precision"
965
	depends on FPE_NWFPE
Linus Torvalds's avatar
Linus Torvalds committed
966
967
968
969
970
971
972
973
974
975
976
	help
	  Say Y to include 80-bit support in the kernel floating-point
	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
	  Note that gcc does not generate 80-bit operations by default,
	  so in most cases this option only enlarges the size of the
	  floating point emulator without any good reason.

	  You almost surely want to say N here.

config FPE_FASTFPE
	bool "FastFPE math emulation (EXPERIMENTAL)"
977
	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
Linus Torvalds's avatar
Linus Torvalds committed
978
979
980
981
982
983
984
985
986
987
988
989
990
	---help---
	  Say Y here to include the FAST floating point emulator in the kernel.
	  This is an experimental much faster emulator which now also has full
	  precision for the mantissa.  It does not support any exceptions.
	  It is very simple, and approximately 3-6 times faster than NWFPE.

	  It should be sufficient for most programs.  It may be not suitable
	  for scientific calculations, but you have to check this for yourself.
	  If you do not feel you need a faster FP emulation you should better
	  choose NWFPE.

config VFP
	bool "VFP-format floating point maths"
Russell King's avatar
Russell King committed
991
	depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
Linus Torvalds's avatar
Linus Torvalds committed
992
993
994
995
996
997
998
999
1000
	help
	  Say Y to include VFP support code in the kernel. This is needed
	  if your hardware includes a VFP unit.

	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
	  release notes and additional status information.

	  Say N if your target does not have VFP hardware.

For faster browsing, not all history is shown. View entire blame