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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
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
Alessandro Zummo12b824f2006-03-27 01:16:35 -080011 select RTC_LIB
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 help
13 The ARM series is a line of low-power-consumption RISC chip designs
Martin Michlmayrf6c89652006-02-08 21:09:07 +000014 licensed by ARM Ltd and targeted at embedded applications and
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
Martin Michlmayrf6c89652006-02-08 21:09:07 +000016 manufactured, but legacy ARM-based PC hardware remains popular in
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 Europe. There is an ARM Linux project with a web page at
18 <http://www.arm.linux.org.uk/>.
19
Kevin Hilman746140c2006-09-22 00:16:30 +010020config GENERIC_TIME
21 bool
22 default n
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024config MMU
25 bool
26 default y
27
28config EISA
29 bool
30 ---help---
31 The Extended Industry Standard Architecture (EISA) bus was
32 developed as an open alternative to the IBM MicroChannel bus.
33
34 The EISA bus provided some of the features of the IBM MicroChannel
35 bus while maintaining backward compatibility with cards made for
36 the older ISA bus. The EISA bus saw limited use between 1988 and
37 1995 when it was made obsolete by the PCI bus.
38
39 Say Y here if you are building a kernel for an EISA-based machine.
40
41 Otherwise, say N.
42
43config SBUS
44 bool
45
46config MCA
47 bool
48 help
49 MicroChannel Architecture is found in some IBM PS/2 machines and
50 laptops. It is a bus system similar to PCI or ISA. See
51 <file:Documentation/mca.txt> (and especially the web page given
52 there) before attempting to build an MCA bus kernel.
53
Thomas Gleixner4a2581a2006-07-01 22:30:09 +010054config GENERIC_HARDIRQS
55 bool
56 default y
57
Russell King7ad1bcb2006-08-27 12:07:02 +010058config TRACE_IRQFLAGS_SUPPORT
59 bool
60 default y
61
Thomas Gleixner4a2581a2006-07-01 22:30:09 +010062config HARDIRQS_SW_RESEND
63 bool
64 default y
65
66config GENERIC_IRQ_PROBE
67 bool
68 default y
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070config RWSEM_GENERIC_SPINLOCK
71 bool
72 default y
73
74config RWSEM_XCHGADD_ALGORITHM
75 bool
76
Akinobu Mitab89c3b12006-03-26 01:39:19 -080077config GENERIC_HWEIGHT
78 bool
79 default y
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081config GENERIC_CALIBRATE_DELAY
82 bool
83 default y
84
85config GENERIC_BUST_SPINLOCK
86 bool
87
viro@ZenIV.linux.org.uka08b6b72005-09-06 01:48:42 +010088config ARCH_MAY_HAVE_PC_FDC
89 bool
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091config GENERIC_ISA_DMA
92 bool
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094config FIQ
95 bool
96
Al Viro034d2f52005-12-19 16:27:59 -050097config ARCH_MTD_XIP
98 bool
99
Hyok S. Choic760fc12006-03-27 15:18:50 +0100100config VECTORS_BASE
101 hex
Hyok S. Choi6afd6fa2006-09-28 21:46:34 +0900102 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
Hyok S. Choic760fc12006-03-27 15:18:50 +0100103 default DRAM_BASE if REMAP_VECTORS_TO_RAM
104 default 0x00000000
105 help
106 The base address of exception vectors.
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108source "init/Kconfig"
109
110menu "System Type"
111
112choice
113 prompt "ARM system type"
Catalin Marinas6a0e2432006-03-07 14:42:27 +0000114 default ARCH_VERSATILE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100116config ARCH_AAEC2000
117 bool "Agilent AAEC-2000 based"
118 select ARM_AMBA
119 help
120 This enables support for systems based on the Agilent AAEC-2000
121
122config ARCH_INTEGRATOR
123 bool "ARM Ltd. Integrator family"
124 select ARM_AMBA
125 select ICST525
126 help
127 Support for ARM's Integrator platform.
128
129config ARCH_REALVIEW
130 bool "ARM Ltd. RealView family"
131 select ARM_AMBA
132 select ICST307
133 help
134 This enables support for ARM Ltd RealView boards.
135
136config ARCH_VERSATILE
137 bool "ARM Ltd. Versatile family"
138 select ARM_AMBA
139 select ARM_VIC
140 select ICST307
141 help
142 This enables support for ARM Ltd Versatile board.
143
Andrew Victor8fc5ffa2006-06-29 16:06:33 +0100144config ARCH_AT91
145 bool "Atmel AT91"
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100146 help
Andrew Victor8fc5ffa2006-06-29 16:06:33 +0100147 This enables support for systems based on the Atmel AT91RM9200
148 and AT91SAM9xxx processors.
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150config ARCH_CLPS7500
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100151 bool "Cirrus CL-PS7500FE"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 select TIMER_ACORN
Russell Kingf7e68bb2005-05-05 14:49:01 +0100153 select ISA
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000154 help
155 Support for the Cirrus Logic PS7500FE system-on-a-chip.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157config ARCH_CLPS711X
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100158 bool "Cirrus Logic CLPS711x/EP721x-based"
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000159 help
160 Support for Cirrus Logic 711x/721x based boards.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162config ARCH_CO285
163 bool "Co-EBSA285"
164 select FOOTBRIDGE
165 select FOOTBRIDGE_ADDIN
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000166 help
167 Support for Intel's EBSA285 companion chip.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169config ARCH_EBSA110
170 bool "EBSA-110"
Russell Kingf7e68bb2005-05-05 14:49:01 +0100171 select ISA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 help
173 This is an evaluation board for the StrongARM processor available
Martin Michlmayrf6c89652006-02-08 21:09:07 +0000174 from Digital. It has limited hardware on-board, including an
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 Ethernet interface, two PCMCIA sockets, two serial ports and a
176 parallel port.
177
Lennert Buytenheke7736d42006-03-20 17:10:13 +0000178config ARCH_EP93XX
179 bool "EP93xx-based"
180 select ARM_AMBA
181 select ARM_VIC
182 help
183 This enables support for the Cirrus EP93xx series of CPUs.
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185config ARCH_FOOTBRIDGE
186 bool "FootBridge"
187 select FOOTBRIDGE
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000188 help
189 Support for systems based on the DC21285 companion chip
190 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100192config ARCH_NETX
193 bool "Hilscher NetX based"
194 select ARM_VIC
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000195 help
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100196 This enables support for systems based on the Hilscher NetX Soc
197
198config ARCH_H720X
199 bool "Hynix HMS720x-based"
200 select ISA_DMA_API
201 help
202 This enables support for systems based on the Hynix HMS720x
203
204config ARCH_IMX
205 bool "IMX"
206 help
207 Support for Motorola's i.MX family of processors (MX1, MXL).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Lennert Buytenhek3f7e5812006-09-18 23:10:26 +0100209config ARCH_IOP32X
210 bool "IOP32x-based"
Russell Kinga4f7e762006-06-28 12:52:41 +0100211 depends on MMU
Lennert Buytenhek7ae1f7e2006-09-18 23:12:53 +0100212 select PLAT_IOP
Russell Kingf7e68bb2005-05-05 14:49:01 +0100213 select PCI
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000214 help
Lennert Buytenhek3f7e5812006-09-18 23:10:26 +0100215 Support for Intel's 80219 and IOP32X (XScale) family of
216 processors.
217
218config ARCH_IOP33X
219 bool "IOP33x-based"
220 depends on MMU
Lennert Buytenhek7ae1f7e2006-09-18 23:12:53 +0100221 select PLAT_IOP
Lennert Buytenhek3f7e5812006-09-18 23:10:26 +0100222 select PCI
223 help
224 Support for Intel's IOP33X (XScale) family of processors.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Dan Williams285f5fa2006-12-07 02:59:39 +0100226config ARCH_IOP13XX
227 bool "IOP13xx-based"
228 select PCI
229 help
230 Support for Intel's IOP13XX (XScale) family of processors.
231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232config ARCH_IXP4XX
233 bool "IXP4xx-based"
Russell Kinga4f7e762006-06-28 12:52:41 +0100234 depends on MMU
Kevin Hilman84904d02006-09-22 00:58:57 +0100235 select GENERIC_TIME
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000236 help
237 Support for Intel's IXP4XX (XScale) family of processors.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239config ARCH_IXP2000
240 bool "IXP2400/2800-based"
Russell Kinga4f7e762006-06-28 12:52:41 +0100241 depends on MMU
Russell Kingf7e68bb2005-05-05 14:49:01 +0100242 select PCI
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000243 help
244 Support for Intel's IXP2400/2800 (XScale) family of processors.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Lennert Buytenhekc4713072006-03-28 21:18:54 +0100246config ARCH_IXP23XX
247 bool "IXP23XX-based"
Russell Kinga4f7e762006-06-28 12:52:41 +0100248 depends on MMU
Lennert Buytenhekc4713072006-03-28 21:18:54 +0100249 select PCI
250 help
251 Support for Intel's IXP23xx (XScale) family of processors.
252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253config ARCH_L7200
254 bool "LinkUp-L7200"
255 select FIQ
256 help
257 Say Y here if you intend to run this kernel on a LinkUp Systems
258 L7200 Software Development Board which uses an ARM720T processor.
259 Information on this board can be obtained at:
260
261 <http://www.linkupsys.com/>
262
263 If you have any questions or comments about the Linux kernel port
264 to this board, send e-mail to <sjhill@cotw.com>.
265
Deepak Saxena4af6fee2006-06-20 21:30:44 +0100266config ARCH_PNX4008
267 bool "Philips Nexperia PNX4008 Mobile"
268 help
269 This enables support for Philips PNX4008 mobile platform.
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271config ARCH_PXA
272 bool "PXA2xx-based"
Russell Kinga4f7e762006-06-28 12:52:41 +0100273 depends on MMU
Al Viro034d2f52005-12-19 16:27:59 -0500274 select ARCH_MTD_XIP
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000275 help
276 Support for Intel's PXA2XX processor line.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278config ARCH_RPC
279 bool "RiscPC"
280 select ARCH_ACORN
281 select FIQ
282 select TIMER_ACORN
viro@ZenIV.linux.org.uka08b6b72005-09-06 01:48:42 +0100283 select ARCH_MAY_HAVE_PC_FDC
Russell King065909b2006-01-04 15:44:16 +0000284 select ISA_DMA_API
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 help
286 On the Acorn Risc-PC, Linux can support the internal IDE disk and
287 CD-ROM interface, serial and parallel port, and the floppy drive.
288
289config ARCH_SA1100
290 bool "SA1100-based"
Russell Kingf7e68bb2005-05-05 14:49:01 +0100291 select ISA
Russell King3cd9e192005-06-25 19:29:34 +0100292 select ARCH_DISCONTIGMEM_ENABLE
Al Viro034d2f52005-12-19 16:27:59 -0500293 select ARCH_MTD_XIP
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000294 help
295 Support for StrongARM 11x0 based boards.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297config ARCH_S3C2410
Ben Dookscd701aa2006-06-26 15:12:58 +0100298 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 help
300 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
301 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
Martin Michlmayrf6c89652006-02-08 21:09:07 +0000302 the Samsung SMDK2410 development board (and derivatives).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304config ARCH_SHARK
305 bool "Shark"
Russell Kingf7e68bb2005-05-05 14:49:01 +0100306 select ISA
307 select ISA_DMA
308 select PCI
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000309 help
310 Support for the StrongARM based Digital DNARD machine, also known
311 as "Shark" (<http://www.shark-linux.de/shark.html>).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313config ARCH_LH7A40X
314 bool "Sharp LH7A40X"
315 help
316 Say Y here for systems based on one of the Sharp LH7A40X
317 System on a Chip processors. These CPUs include an ARM922T
318 core with a wide array of integrated devices for
319 hand-held and low-power applications.
320
321config ARCH_OMAP
322 bool "TI OMAP"
Martin Michlmayrf999b8b2006-02-08 21:09:05 +0000323 help
324 Support for TI's OMAP platform (OMAP1 and OMAP2).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326endchoice
327
328source "arch/arm/mach-clps711x/Kconfig"
329
Lennert Buytenheke7736d42006-03-20 17:10:13 +0000330source "arch/arm/mach-ep93xx/Kconfig"
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332source "arch/arm/mach-footbridge/Kconfig"
333
334source "arch/arm/mach-integrator/Kconfig"
335
Lennert Buytenhek3f7e5812006-09-18 23:10:26 +0100336source "arch/arm/mach-iop32x/Kconfig"
337
338source "arch/arm/mach-iop33x/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Dan Williams285f5fa2006-12-07 02:59:39 +0100340source "arch/arm/mach-iop13xx/Kconfig"
341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342source "arch/arm/mach-ixp4xx/Kconfig"
343
344source "arch/arm/mach-ixp2000/Kconfig"
345
Lennert Buytenhekc4713072006-03-28 21:18:54 +0100346source "arch/arm/mach-ixp23xx/Kconfig"
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348source "arch/arm/mach-pxa/Kconfig"
349
350source "arch/arm/mach-sa1100/Kconfig"
351
Tony Lindgrend48af152005-07-10 19:58:17 +0100352source "arch/arm/plat-omap/Kconfig"
353
354source "arch/arm/mach-omap1/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Tony Lindgren1dbae812005-11-10 14:26:51 +0000356source "arch/arm/mach-omap2/Kconfig"
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358source "arch/arm/mach-s3c2410/Kconfig"
359
360source "arch/arm/mach-lh7a40x/Kconfig"
361
362source "arch/arm/mach-imx/Kconfig"
363
364source "arch/arm/mach-h720x/Kconfig"
365
366source "arch/arm/mach-versatile/Kconfig"
367
Bellido Nicolas038c5b62005-06-20 18:51:05 +0100368source "arch/arm/mach-aaec2000/Kconfig"
369
Catalin Marinas8ad68bb2005-10-31 14:25:02 +0000370source "arch/arm/mach-realview/Kconfig"
371
SAN People73a59c12006-01-09 17:05:41 +0000372source "arch/arm/mach-at91rm9200/Kconfig"
373
Sascha Hauerbb6d8c82006-06-19 15:27:53 +0100374source "arch/arm/mach-netx/Kconfig"
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376# Definitions to make life easier
377config ARCH_ACORN
378 bool
379
Lennert Buytenhek7ae1f7e2006-09-18 23:12:53 +0100380config PLAT_IOP
381 bool
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383source arch/arm/mm/Kconfig
384
Lennert Buytenhekafe4b252006-12-03 18:51:14 +0100385config IWMMXT
386 bool "Enable iWMMXt support"
387 depends CPU_XSCALE || CPU_XSC3
388 default y if PXA27x
389 help
390 Enable support for iWMMXt context switching at run time if
391 running on a CPU that supports it.
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393# bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
394config XSCALE_PMU
395 bool
396 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
397 default y
398
Hyok S. Choi3b93e7b2006-06-22 11:48:56 +0100399if !MMU
400source "arch/arm/Kconfig-nommu"
401endif
402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403endmenu
404
405source "arch/arm/common/Kconfig"
406
407config FORCE_MAX_ZONEORDER
408 int
409 depends on SA1111
410 default "9"
411
412menu "Bus support"
413
414config ARM_AMBA
415 bool
416
417config ISA
418 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 help
420 Find out whether you have ISA slots on your motherboard. ISA is the
421 name of a bus system, i.e. the way the CPU talks to the other stuff
422 inside your box. Other bus systems are PCI, EISA, MicroChannel
423 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
424 newer boards don't support it. If you have ISA, say Y, otherwise N.
425
Russell King065909b2006-01-04 15:44:16 +0000426# Select ISA DMA controller support
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427config ISA_DMA
428 bool
Russell King065909b2006-01-04 15:44:16 +0000429 select ISA_DMA_API
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Russell King065909b2006-01-04 15:44:16 +0000431# Select ISA DMA interface
Al Viro5cae8412005-05-04 05:39:22 +0100432config ISA_DMA_API
433 bool
Al Viro5cae8412005-05-04 05:39:22 +0100434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435config PCI
Milan Svoboda68939122006-06-25 22:12:12 +0100436 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 help
438 Find out whether you have a PCI motherboard. PCI is the name of a
439 bus system, i.e. the way the CPU talks to the other stuff inside
440 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
441 VESA. If you have PCI, say Y, otherwise N.
442
443 The PCI-HOWTO, available from
444 <http://www.tldp.org/docs.html#howto>, contains valuable
445 information about which PCI hardware does work under Linux and which
446 doesn't.
447
448# Select the host bridge type
449config PCI_HOST_VIA82C505
450 bool
451 depends on PCI && ARCH_SHARK
452 default y
453
454source "drivers/pci/Kconfig"
455
456source "drivers/pcmcia/Kconfig"
457
458endmenu
459
460menu "Kernel Features"
461
462config SMP
463 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
Russell Kingf6db4492005-11-07 21:30:21 +0000464 depends on EXPERIMENTAL && REALVIEW_MPCORE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 help
466 This enables support for systems with more than one CPU. If you have
467 a system with only one CPU, like most personal computers, say N. If
468 you have a system with more than one CPU, say Y.
469
470 If you say N here, the kernel will run on single and multiprocessor
471 machines, but will use only one CPU of a multiprocessor machine. If
472 you say Y here, the kernel will run on many, but not all, single
473 processor machines. On a single processor machine, the kernel will
474 run faster if you say N here.
475
Arthur Othieno12c62c22005-09-10 00:26:22 -0700476 See also the <file:Documentation/smp.txt>,
477 <file:Documentation/i386/IO-APIC.txt>,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
479 <http://www.linuxdoc.org/docs.html#howto>.
480
481 If you don't know what to do here, say N.
482
483config NR_CPUS
484 int "Maximum number of CPUs (2-32)"
485 range 2 32
486 depends on SMP
487 default "4"
488
Russell Kinga054a812005-11-02 22:24:33 +0000489config HOTPLUG_CPU
490 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
491 depends on SMP && HOTPLUG && EXPERIMENTAL
492 help
493 Say Y here to experiment with turning CPUs off and on. CPUs
494 can be controlled through /sys/devices/system/cpu.
495
Russell King37ee16a2005-11-08 19:08:05 +0000496config LOCAL_TIMERS
497 bool "Use local timer interrupts"
Russell King2a98beb2005-11-09 10:50:29 +0000498 depends on SMP && REALVIEW_MPCORE
Russell King37ee16a2005-11-08 19:08:05 +0000499 default y
500 help
501 Enable support for local timers on SMP platforms, rather then the
502 legacy IPI broadcast method. Local timers allows the system
503 accounting to be spread across the timer interval, preventing a
504 "thundering herd" at every timer tick.
505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506config PREEMPT
507 bool "Preemptible Kernel (EXPERIMENTAL)"
508 depends on EXPERIMENTAL
509 help
510 This option reduces the latency of the kernel when reacting to
511 real-time or interactive events by allowing a low priority process to
512 be preempted even if it is in kernel mode executing a system call.
513 This allows applications to run more reliably even when the system is
514 under load.
515
516 Say Y here if you are building a kernel for a desktop, embedded
517 or real-time system. Say N if you are unsure.
518
Russell King8749af62005-06-25 19:39:45 +0100519config NO_IDLE_HZ
520 bool "Dynamic tick timer"
521 help
522 Select this option if you want to disable continuous timer ticks
523 and have them programmed to occur as required. This option saves
524 power as the system can remain in idle state for longer.
525
526 By default dynamic tick is disabled during the boot, and can be
527 manually enabled with:
528
529 echo 1 > /sys/devices/system/timer/timer0/dyn_tick
530
531 Alternatively, if you want dynamic tick automatically enabled
532 during boot, pass "dyntick=enable" via the kernel command string.
533
Tony Lindgrenf2be64b2005-06-28 21:01:16 +0100534 Please note that dynamic tick may affect the accuracy of
535 timekeeping on some platforms depending on the implementation.
Nicolas Pitre569d2c32005-09-01 12:48:48 +0100536 Currently at least OMAP, PXA2xx and SA11x0 platforms are known
537 to have accurate timekeeping with dynamic tick.
Tony Lindgrenf2be64b2005-06-28 21:01:16 +0100538
Russell Kingf8065812006-03-02 22:41:59 +0000539config HZ
540 int
541 default 128 if ARCH_L7200
542 default 200 if ARCH_EBSA110 || ARCH_S3C2410
Russell Kingbfe65702006-03-04 11:01:53 +0000543 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
Russell Kingf8065812006-03-02 22:41:59 +0000544 default 100
545
Nicolas Pitre704bdda02006-01-14 16:33:50 +0000546config AEABI
547 bool "Use the ARM EABI to compile the kernel"
548 help
549 This option allows for the kernel to be compiled using the latest
550 ARM ABI (aka EABI). This is only useful if you are using a user
551 space environment that is also compiled with EABI.
552
553 Since there are major incompatibilities between the legacy ABI and
554 EABI, especially with regard to structure member alignment, this
555 option also changes the kernel syscall calling convention to
556 disambiguate both ABIs and allow for backward compatibility support
557 (selected with CONFIG_OABI_COMPAT).
558
559 To use this you need GCC version 4.0.0 or later.
560
Nicolas Pitre6c90c872006-01-14 16:37:15 +0000561config OABI_COMPAT
Russell Kinga73a3ff2006-02-08 21:09:55 +0000562 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
Nicolas Pitre61c484d2006-02-08 21:09:08 +0000563 depends on AEABI && EXPERIMENTAL
Nicolas Pitre6c90c872006-01-14 16:37:15 +0000564 default y
565 help
566 This option preserves the old syscall interface along with the
567 new (ARM EABI) one. It also provides a compatibility layer to
568 intercept syscalls that have structure arguments which layout
569 in memory differs between the legacy ABI and the new ARM EABI
570 (only for non "thumb" binaries). This option adds a tiny
571 overhead to all syscalls and produces a slightly larger kernel.
572 If you know you'll be using only pure EABI user space then you
573 can say N here. If this option is not selected and you attempt
574 to execute a legacy ABI binary then the result will be
575 UNPREDICTABLE (in fact it can be predicted that it won't work
576 at all). If in doubt say Y.
577
Dave Hansen3f22ab22005-06-23 00:07:43 -0700578config ARCH_DISCONTIGMEM_ENABLE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 bool
Russell Kingf7e68bb2005-05-05 14:49:01 +0100580 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 help
582 Say Y to support efficient handling of discontiguous physical memory,
583 for architectures which are either NUMA (Non-Uniform Memory Access)
584 or have huge holes in the physical address space for other reasons.
585 See <file:Documentation/vm/numa> for more.
586
Yasunori Gotoc80d79d2006-04-10 22:53:53 -0700587config NODES_SHIFT
588 int
589 default "4" if ARCH_LH7A40X
590 default "2"
591 depends on NEED_MULTIPLE_NODES
592
Dave Hansen3f22ab22005-06-23 00:07:43 -0700593source "mm/Kconfig"
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595config LEDS
596 bool "Timer and CPU usage LEDs"
597 depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
598 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
599 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
600 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
SAN People73a59c12006-01-09 17:05:41 +0000601 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
Andrew Victor58a0cd72006-12-01 14:51:13 +0100602 ARCH_AT91 || MACH_TRIZEPS4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 help
604 If you say Y here, the LEDs on your machine will be used
605 to provide useful information about your current system status.
606
607 If you are compiling a kernel for a NetWinder or EBSA-285, you will
608 be able to select which LEDs are active using the options below. If
609 you are compiling a kernel for the EBSA-110 or the LART however, the
610 red LED will simply flash regularly to indicate that the system is
611 still functional. It is safe to say Y here if you have a CATS
612 system, but the driver will do nothing.
613
614config LEDS_TIMER
615 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
616 MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
617 depends on LEDS
618 default y if ARCH_EBSA110
619 help
620 If you say Y here, one of the system LEDs (the green one on the
621 NetWinder, the amber one on the EBSA285, or the red one on the LART)
622 will flash regularly to indicate that the system is still
623 operational. This is mainly useful to kernel hackers who are
624 debugging unstable kernels.
625
626 The LART uses the same LED for both Timer LED and CPU usage LED
627 functions. You may choose to use both, but the Timer LED function
628 will overrule the CPU usage LED.
629
630config LEDS_CPU
631 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
632 !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
633 depends on LEDS
634 help
635 If you say Y here, the red LED will be used to give a good real
636 time indication of CPU usage, by lighting whenever the idle task
637 is not currently executing.
638
639 The LART uses the same LED for both Timer LED and CPU usage LED
640 functions. You may choose to use both, but the Timer LED function
641 will overrule the CPU usage LED.
642
643config ALIGNMENT_TRAP
644 bool
Hyok S. Choif12d0d72006-09-26 17:36:37 +0900645 depends on CPU_CP15_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 default y if !ARCH_EBSA110
647 help
Matt LaPlante84eb8d02006-10-03 22:53:09 +0200648 ARM processors cannot fetch/store information which is not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
650 address divisible by 4. On 32-bit ARM processors, these non-aligned
651 fetch/store instructions will be emulated in software if you say
652 here, which has a severe performance impact. This is necessary for
653 correct operation of some network protocols. With an IP-only
654 configuration it is safe to say N, otherwise say Y.
655
656endmenu
657
658menu "Boot options"
659
660# Compressed boot loader in ROM. Yes, we really want to ask about
661# TEXT and BSS so we preserve their values in the config files.
662config ZBOOT_ROM_TEXT
663 hex "Compressed ROM boot loader base address"
664 default "0"
665 help
666 The physical address at which the ROM-able zImage is to be
667 placed in the target. Platforms which normally make use of
668 ROM-able zImage formats normally set this to a suitable
669 value in their defconfig file.
670
671 If ZBOOT_ROM is not enabled, this has no effect.
672
673config ZBOOT_ROM_BSS
674 hex "Compressed ROM boot loader BSS address"
675 default "0"
676 help
Dan Fandrichf8c440b2006-09-20 23:28:51 +0100677 The base address of an area of read/write memory in the target
678 for the ROM-able zImage which must be available while the
679 decompressor is running. It must be large enough to hold the
680 entire decompressed kernel plus an additional 128 KiB.
681 Platforms which normally make use of ROM-able zImage formats
682 normally set this to a suitable value in their defconfig file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684 If ZBOOT_ROM is not enabled, this has no effect.
685
686config ZBOOT_ROM
687 bool "Compressed boot loader in ROM/flash"
688 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
689 help
690 Say Y here if you intend to execute your compressed kernel image
691 (zImage) directly from ROM or flash. If unsure, say N.
692
693config CMDLINE
694 string "Default kernel command string"
695 default ""
696 help
697 On some architectures (EBSA110 and CATS), there is currently no way
698 for the boot loader to pass arguments to the kernel. For these
699 architectures, you should supply some command-line options at build
700 time by entering them here. As a minimum, you should specify the
701 memory size and the root device (e.g., mem=64M root=/dev/nfs).
702
703config XIP_KERNEL
704 bool "Kernel Execute-In-Place from ROM"
705 depends on !ZBOOT_ROM
706 help
707 Execute-In-Place allows the kernel to run from non-volatile storage
708 directly addressable by the CPU, such as NOR flash. This saves RAM
709 space since the text section of the kernel is not loaded from flash
710 to RAM. Read-write sections, such as the data section and stack,
711 are still copied to RAM. The XIP kernel is not compressed since
712 it has to run directly from flash, so it will take more space to
713 store it. The flash address used to link the kernel object files,
714 and for storing it, is configuration dependent. Therefore, if you
715 say Y here, you must know the proper physical address where to
716 store the kernel image depending on your own flash memory usage.
717
718 Also note that the make target becomes "make xipImage" rather than
719 "make zImage" or "make Image". The final kernel binary to put in
720 ROM memory will be arch/arm/boot/xipImage.
721
722 If unsure, say N.
723
724config XIP_PHYS_ADDR
725 hex "XIP Kernel Physical Location"
726 depends on XIP_KERNEL
727 default "0x00080000"
728 help
729 This is the physical address in your flash memory the kernel will
730 be linked for and stored to. This address is dependent on your
731 own flash usage.
732
733endmenu
734
Pavel Pisa3c8cd0c2006-12-06 17:25:04 +0100735if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
737menu "CPU Frequency scaling"
738
739source "drivers/cpufreq/Kconfig"
740
741config CPU_FREQ_SA1100
742 bool
Vincent Sanders07c6d482005-06-09 21:59:22 +0100743 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 default y
745
746config CPU_FREQ_SA1110
747 bool
748 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
749 default y
750
751config CPU_FREQ_INTEGRATOR
752 tristate "CPUfreq driver for ARM Integrator CPUs"
753 depends on ARCH_INTEGRATOR && CPU_FREQ
754 default y
755 help
756 This enables the CPUfreq driver for ARM Integrator CPUs.
757
758 For details, take a look at <file:Documentation/cpu-freq>.
759
760 If in doubt, say Y.
761
Pavel Pisa3c8cd0c2006-12-06 17:25:04 +0100762config CPU_FREQ_IMX
763 tristate "CPUfreq driver for i.MX CPUs"
764 depends on ARCH_IMX && CPU_FREQ
765 default n
766 help
767 This enables the CPUfreq driver for i.MX CPUs.
768
769 If in doubt, say N.
770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771endmenu
772
773endif
774
775menu "Floating point emulation"
776
777comment "At least one emulation must be selected"
778
779config FPE_NWFPE
780 bool "NWFPE math emulation"
Nicolas Pitre8993a442006-01-14 16:36:50 +0000781 depends on !AEABI || OABI_COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 ---help---
783 Say Y to include the NWFPE floating point emulator in the kernel.
784 This is necessary to run most binaries. Linux does not currently
785 support floating point hardware so you need to say Y here even if
786 your machine has an FPA or floating point co-processor podule.
787
788 You may say N here if you are going to load the Acorn FPEmulator
789 early in the bootup.
790
791config FPE_NWFPE_XP
792 bool "Support extended precision"
Lennert Buytenhekbedf1422005-11-07 21:12:08 +0000793 depends on FPE_NWFPE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 help
795 Say Y to include 80-bit support in the kernel floating-point
796 emulator. Otherwise, only 32 and 64-bit support is compiled in.
797 Note that gcc does not generate 80-bit operations by default,
798 so in most cases this option only enlarges the size of the
799 floating point emulator without any good reason.
800
801 You almost surely want to say N here.
802
803config FPE_FASTFPE
804 bool "FastFPE math emulation (EXPERIMENTAL)"
Nicolas Pitre8993a442006-01-14 16:36:50 +0000805 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 ---help---
807 Say Y here to include the FAST floating point emulator in the kernel.
808 This is an experimental much faster emulator which now also has full
809 precision for the mantissa. It does not support any exceptions.
810 It is very simple, and approximately 3-6 times faster than NWFPE.
811
812 It should be sufficient for most programs. It may be not suitable
813 for scientific calculations, but you have to check this for yourself.
814 If you do not feel you need a faster FP emulation you should better
815 choose NWFPE.
816
817config VFP
818 bool "VFP-format floating point maths"
819 depends on CPU_V6 || CPU_ARM926T
820 help
821 Say Y to include VFP support code in the kernel. This is needed
822 if your hardware includes a VFP unit.
823
824 Please see <file:Documentation/arm/VFP/release-notes.txt> for
825 release notes and additional status information.
826
827 Say N if your target does not have VFP hardware.
828
829endmenu
830
831menu "Userspace binary formats"
832
833source "fs/Kconfig.binfmt"
834
835config ARTHUR
836 tristate "RISC OS personality"
Nicolas Pitre704bdda02006-01-14 16:33:50 +0000837 depends on !AEABI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 help
839 Say Y here to include the kernel code necessary if you want to run
840 Acorn RISC OS/Arthur binaries under Linux. This code is still very
841 experimental; if this sounds frightening, say N and sleep in peace.
842 You can also say M here to compile this support as a module (which
843 will be called arthur).
844
845endmenu
846
847menu "Power management options"
848
Russell Kingeceab4a2005-11-15 11:31:41 +0000849source "kernel/power/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851config APM
852 tristate "Advanced Power Management Emulation"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 ---help---
854 APM is a BIOS specification for saving power using several different
855 techniques. This is mostly useful for battery powered laptops with
856 APM compliant BIOSes. If you say Y here, the system time will be
857 reset after a RESUME operation, the /proc/apm device will provide
858 battery status information, and user-space programs will receive
859 notification of APM "events" (e.g. battery status change).
860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 In order to use APM, you will need supporting software. For location
862 and more information, read <file:Documentation/pm.txt> and the
863 Battery Powered Linux mini-HOWTO, available from
864 <http://www.tldp.org/docs.html#howto>.
865
866 This driver does not spin down disk drives (see the hdparm(8)
867 manpage ("man 8 hdparm") for that), and it doesn't turn off
868 VESA-compliant "green" monitors.
869
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 Generally, if you don't have a battery in your machine, there isn't
871 much point in using this driver and you should say N. If you get
872 random kernel OOPSes or reboots that don't seem to be related to
873 anything, try disabling/enabling this option (or disabling/enabling
874 APM in your BIOS).
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876endmenu
877
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700878source "net/Kconfig"
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880menu "Device Drivers"
881
882source "drivers/base/Kconfig"
883
Pavel Machekc35bf4a2005-11-12 20:25:25 +0000884source "drivers/connector/Kconfig"
885
Hyok S. Choif12d0d72006-09-26 17:36:37 +0900886if ALIGNMENT_TRAP || !CPU_CP15_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887source "drivers/mtd/Kconfig"
888endif
889
890source "drivers/parport/Kconfig"
891
892source "drivers/pnp/Kconfig"
893
894source "drivers/block/Kconfig"
895
896source "drivers/acorn/block/Kconfig"
897
Lennert Buytenhek3f7e5812006-09-18 23:10:26 +0100898if PCMCIA || ARCH_CLPS7500 || ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX \
David Brownellbb011b82005-06-12 23:26:05 +0100899 || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
Lennert Buytenhekc4713072006-03-28 21:18:54 +0100900 || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
901 || ARCH_IXP23XX
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902source "drivers/ide/Kconfig"
903endif
904
905source "drivers/scsi/Kconfig"
906
Martin Michlmayreb370f02006-11-17 00:14:35 +0100907source "drivers/ata/Kconfig"
908
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909source "drivers/md/Kconfig"
910
911source "drivers/message/fusion/Kconfig"
912
913source "drivers/ieee1394/Kconfig"
914
915source "drivers/message/i2o/Kconfig"
916
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700917source "drivers/net/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919source "drivers/isdn/Kconfig"
920
921# input before char - char/joystick depends on it. As does USB.
922
923source "drivers/input/Kconfig"
924
925source "drivers/char/Kconfig"
926
927source "drivers/i2c/Kconfig"
928
David Brownell8ae12a02006-01-08 13:34:19 -0800929source "drivers/spi/Kconfig"
930
Alessandro Zummo04916c02006-03-10 22:30:01 +0000931source "drivers/w1/Kconfig"
932
Jean Delvaread2f9312005-07-02 18:15:49 +0200933source "drivers/hwmon/Kconfig"
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935#source "drivers/l3/Kconfig"
936
937source "drivers/misc/Kconfig"
938
Russell Kinga4e137a2005-08-18 10:06:59 +0100939source "drivers/mfd/Kconfig"
940
Richard Purdiec72a1d62006-03-31 02:31:04 -0800941source "drivers/leds/Kconfig"
942
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943source "drivers/media/Kconfig"
944
945source "drivers/video/Kconfig"
946
947source "sound/Kconfig"
948
Sascha Hauerc2dade52006-12-12 10:32:42 +0100949source "drivers/hid/Kconfig"
950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951source "drivers/usb/Kconfig"
952
953source "drivers/mmc/Kconfig"
954
Alessandro Zummo12b824f2006-03-27 01:16:35 -0800955source "drivers/rtc/Kconfig"
956
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957endmenu
958
959source "fs/Kconfig"
960
961source "arch/arm/oprofile/Kconfig"
962
963source "arch/arm/Kconfig.debug"
964
965source "security/Kconfig"
966
967source "crypto/Kconfig"
968
969source "lib/Kconfig"