xref: /linux/arch/arm/Kconfig (revision de2fe5e07d58424bc286fff3fd3c1b0bf933cd58) 
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
11	select RTC_LIB
12	help
13	  The ARM series is a line of low-power-consumption RISC chip designs
14	  licensed by ARM Ltd and targeted at embedded applications and
15	  handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
16	  manufactured, but legacy ARM-based PC hardware remains popular in
17	  Europe.  There is an ARM Linux project with a web page at
18	  <http://www.arm.linux.org.uk/>.
19
20config MMU
21	bool
22	default y
23
24config EISA
25	bool
26	---help---
27	  The Extended Industry Standard Architecture (EISA) bus was
28	  developed as an open alternative to the IBM MicroChannel bus.
29
30	  The EISA bus provided some of the features of the IBM MicroChannel
31	  bus while maintaining backward compatibility with cards made for
32	  the older ISA bus.  The EISA bus saw limited use between 1988 and
33	  1995 when it was made obsolete by the PCI bus.
34
35	  Say Y here if you are building a kernel for an EISA-based machine.
36
37	  Otherwise, say N.
38
39config SBUS
40	bool
41
42config MCA
43	bool
44	help
45	  MicroChannel Architecture is found in some IBM PS/2 machines and
46	  laptops.  It is a bus system similar to PCI or ISA. See
47	  <file:Documentation/mca.txt> (and especially the web page given
48	  there) before attempting to build an MCA bus kernel.
49
50config RWSEM_GENERIC_SPINLOCK
51	bool
52	default y
53
54config RWSEM_XCHGADD_ALGORITHM
55	bool
56
57config GENERIC_HWEIGHT
58	bool
59	default y
60
61config GENERIC_CALIBRATE_DELAY
62	bool
63	default y
64
65config GENERIC_BUST_SPINLOCK
66	bool
67
68config ARCH_MAY_HAVE_PC_FDC
69	bool
70
71config GENERIC_ISA_DMA
72	bool
73
74config FIQ
75	bool
76
77config ARCH_MTD_XIP
78	bool
79
80source "init/Kconfig"
81
82menu "System Type"
83
84choice
85	prompt "ARM system type"
86	default ARCH_VERSATILE
87
88config ARCH_CLPS7500
89	bool "Cirrus-CL-PS7500FE"
90	select TIMER_ACORN
91	select ISA
92	help
93	  Support for the Cirrus Logic PS7500FE system-on-a-chip.
94
95config ARCH_CLPS711X
96	bool "CLPS711x/EP721x-based"
97	help
98	  Support for Cirrus Logic 711x/721x based boards.
99
100config ARCH_CO285
101	bool "Co-EBSA285"
102	select FOOTBRIDGE
103	select FOOTBRIDGE_ADDIN
104	help
105	  Support for Intel's EBSA285 companion chip.
106
107config ARCH_EBSA110
108	bool "EBSA-110"
109	select ISA
110	help
111	  This is an evaluation board for the StrongARM processor available
112	  from Digital. It has limited hardware on-board, including an
113	  Ethernet interface, two PCMCIA sockets, two serial ports and a
114	  parallel port.
115
116config ARCH_EP93XX
117	bool "EP93xx-based"
118	select ARM_AMBA
119	select ARM_VIC
120	help
121	  This enables support for the Cirrus EP93xx series of CPUs.
122
123config ARCH_FOOTBRIDGE
124	bool "FootBridge"
125	select FOOTBRIDGE
126	help
127	  Support for systems based on the DC21285 companion chip
128	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
129
130config ARCH_INTEGRATOR
131	bool "Integrator"
132	select ARM_AMBA
133	select ICST525
134	help
135	  Support for ARM's Integrator platform.
136
137config ARCH_IOP3XX
138	bool "IOP3xx-based"
139	select PCI
140	help
141	  Support for Intel's IOP3XX (XScale) family of processors.
142
143config ARCH_IXP4XX
144	bool "IXP4xx-based"
145	select DMABOUNCE
146	select PCI
147	help
148	  Support for Intel's IXP4XX (XScale) family of processors.
149
150config ARCH_IXP2000
151	bool "IXP2400/2800-based"
152	select PCI
153	help
154	  Support for Intel's IXP2400/2800 (XScale) family of processors.
155
156config ARCH_IXP23XX
157 	bool "IXP23XX-based"
158 	select PCI
159	help
160	  Support for Intel's IXP23xx (XScale) family of processors.
161
162config ARCH_L7200
163	bool "LinkUp-L7200"
164	select FIQ
165	help
166	  Say Y here if you intend to run this kernel on a LinkUp Systems
167	  L7200 Software Development Board which uses an ARM720T processor.
168	  Information on this board can be obtained at:
169
170	  <http://www.linkupsys.com/>
171
172	  If you have any questions or comments about the Linux kernel port
173	  to this board, send e-mail to <sjhill@cotw.com>.
174
175config ARCH_PXA
176	bool "PXA2xx-based"
177	select ARCH_MTD_XIP
178	help
179	  Support for Intel's PXA2XX processor line.
180
181config ARCH_RPC
182	bool "RiscPC"
183	select ARCH_ACORN
184	select FIQ
185	select TIMER_ACORN
186	select ARCH_MAY_HAVE_PC_FDC
187	select ISA_DMA_API
188	help
189	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
190	  CD-ROM interface, serial and parallel port, and the floppy drive.
191
192config ARCH_SA1100
193	bool "SA1100-based"
194	select ISA
195	select ARCH_DISCONTIGMEM_ENABLE
196	select ARCH_MTD_XIP
197	help
198	  Support for StrongARM 11x0 based boards.
199
200config ARCH_S3C2410
201	bool "Samsung S3C2410"
202	help
203	  Samsung S3C2410X CPU based systems, such as the Simtec Electronics
204	  BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
205	  the Samsung SMDK2410 development board (and derivatives).
206
207config ARCH_SHARK
208	bool "Shark"
209	select ISA
210	select ISA_DMA
211	select PCI
212	help
213	  Support for the StrongARM based Digital DNARD machine, also known
214	  as "Shark" (<http://www.shark-linux.de/shark.html>).
215
216config ARCH_LH7A40X
217	bool "Sharp LH7A40X"
218	help
219	  Say Y here for systems based on one of the Sharp LH7A40X
220	  System on a Chip processors.  These CPUs include an ARM922T
221	  core with a wide array of integrated devices for
222	  hand-held and low-power applications.
223
224config ARCH_OMAP
225	bool "TI OMAP"
226	help
227	  Support for TI's OMAP platform (OMAP1 and OMAP2).
228
229config ARCH_VERSATILE
230	bool "Versatile"
231	select ARM_AMBA
232	select ARM_VIC
233	select ICST307
234	help
235	  This enables support for ARM Ltd Versatile board.
236
237config ARCH_REALVIEW
238	bool "RealView"
239	select ARM_AMBA
240	select ICST307
241	help
242	  This enables support for ARM Ltd RealView boards.
243
244config ARCH_IMX
245	bool "IMX"
246	help
247	  Support for Motorola's i.MX family of processors (MX1, MXL).
248
249config ARCH_H720X
250	bool "Hynix-HMS720x-based"
251	select ISA_DMA_API
252	help
253	  This enables support for systems based on the Hynix HMS720x
254
255config ARCH_AAEC2000
256	bool "Agilent AAEC-2000 based"
257	select ARM_AMBA
258	help
259	  This enables support for systems based on the Agilent AAEC-2000
260
261config ARCH_AT91RM9200
262	bool "AT91RM9200"
263	help
264	  Say Y here if you intend to run this kernel on an Atmel
265	  AT91RM9200-based board.
266
267endchoice
268
269source "arch/arm/mach-clps711x/Kconfig"
270
271source "arch/arm/mach-ep93xx/Kconfig"
272
273source "arch/arm/mach-footbridge/Kconfig"
274
275source "arch/arm/mach-integrator/Kconfig"
276
277source "arch/arm/mach-iop3xx/Kconfig"
278
279source "arch/arm/mach-ixp4xx/Kconfig"
280
281source "arch/arm/mach-ixp2000/Kconfig"
282
283source "arch/arm/mach-ixp23xx/Kconfig"
284
285source "arch/arm/mach-pxa/Kconfig"
286
287source "arch/arm/mach-sa1100/Kconfig"
288
289source "arch/arm/plat-omap/Kconfig"
290
291source "arch/arm/mach-omap1/Kconfig"
292
293source "arch/arm/mach-omap2/Kconfig"
294
295source "arch/arm/mach-s3c2410/Kconfig"
296
297source "arch/arm/mach-lh7a40x/Kconfig"
298
299source "arch/arm/mach-imx/Kconfig"
300
301source "arch/arm/mach-h720x/Kconfig"
302
303source "arch/arm/mach-versatile/Kconfig"
304
305source "arch/arm/mach-aaec2000/Kconfig"
306
307source "arch/arm/mach-realview/Kconfig"
308
309source "arch/arm/mach-at91rm9200/Kconfig"
310
311# Definitions to make life easier
312config ARCH_ACORN
313	bool
314
315source arch/arm/mm/Kconfig
316
317#  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
318config XSCALE_PMU
319	bool
320	depends on CPU_XSCALE && !XSCALE_PMU_TIMER
321	default y
322
323endmenu
324
325source "arch/arm/common/Kconfig"
326
327config FORCE_MAX_ZONEORDER
328	int
329	depends on SA1111
330	default "9"
331
332menu "Bus support"
333
334config ARM_AMBA
335	bool
336
337config ISA
338	bool
339	help
340	  Find out whether you have ISA slots on your motherboard.  ISA is the
341	  name of a bus system, i.e. the way the CPU talks to the other stuff
342	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
343	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
344	  newer boards don't support it.  If you have ISA, say Y, otherwise N.
345
346# Select ISA DMA controller support
347config ISA_DMA
348	bool
349	select ISA_DMA_API
350
351# Select ISA DMA interface
352config ISA_DMA_API
353	bool
354
355config PCI
356	bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB
357	help
358	  Find out whether you have a PCI motherboard. PCI is the name of a
359	  bus system, i.e. the way the CPU talks to the other stuff inside
360	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
361	  VESA. If you have PCI, say Y, otherwise N.
362
363	  The PCI-HOWTO, available from
364	  <http://www.tldp.org/docs.html#howto>, contains valuable
365	  information about which PCI hardware does work under Linux and which
366	  doesn't.
367
368# Select the host bridge type
369config PCI_HOST_VIA82C505
370	bool
371	depends on PCI && ARCH_SHARK
372	default y
373
374source "drivers/pci/Kconfig"
375
376source "drivers/pcmcia/Kconfig"
377
378endmenu
379
380menu "Kernel Features"
381
382config SMP
383	bool "Symmetric Multi-Processing (EXPERIMENTAL)"
384	depends on EXPERIMENTAL && REALVIEW_MPCORE
385	help
386	  This enables support for systems with more than one CPU. If you have
387	  a system with only one CPU, like most personal computers, say N. If
388	  you have a system with more than one CPU, say Y.
389
390	  If you say N here, the kernel will run on single and multiprocessor
391	  machines, but will use only one CPU of a multiprocessor machine. If
392	  you say Y here, the kernel will run on many, but not all, single
393	  processor machines. On a single processor machine, the kernel will
394	  run faster if you say N here.
395
396	  See also the <file:Documentation/smp.txt>,
397	  <file:Documentation/i386/IO-APIC.txt>,
398	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
399	  <http://www.linuxdoc.org/docs.html#howto>.
400
401	  If you don't know what to do here, say N.
402
403config NR_CPUS
404	int "Maximum number of CPUs (2-32)"
405	range 2 32
406	depends on SMP
407	default "4"
408
409config HOTPLUG_CPU
410	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
411	depends on SMP && HOTPLUG && EXPERIMENTAL
412	help
413	  Say Y here to experiment with turning CPUs off and on.  CPUs
414	  can be controlled through /sys/devices/system/cpu.
415
416config LOCAL_TIMERS
417	bool "Use local timer interrupts"
418	depends on SMP && REALVIEW_MPCORE
419	default y
420	help
421	  Enable support for local timers on SMP platforms, rather then the
422	  legacy IPI broadcast method.  Local timers allows the system
423	  accounting to be spread across the timer interval, preventing a
424	  "thundering herd" at every timer tick.
425
426config PREEMPT
427	bool "Preemptible Kernel (EXPERIMENTAL)"
428	depends on EXPERIMENTAL
429	help
430	  This option reduces the latency of the kernel when reacting to
431	  real-time or interactive events by allowing a low priority process to
432	  be preempted even if it is in kernel mode executing a system call.
433	  This allows applications to run more reliably even when the system is
434	  under load.
435
436	  Say Y here if you are building a kernel for a desktop, embedded
437	  or real-time system.  Say N if you are unsure.
438
439config NO_IDLE_HZ
440	bool "Dynamic tick timer"
441	help
442	  Select this option if you want to disable continuous timer ticks
443	  and have them programmed to occur as required. This option saves
444	  power as the system can remain in idle state for longer.
445
446	  By default dynamic tick is disabled during the boot, and can be
447	  manually enabled with:
448
449	    echo 1 > /sys/devices/system/timer/timer0/dyn_tick
450
451	  Alternatively, if you want dynamic tick automatically enabled
452	  during boot, pass "dyntick=enable" via the kernel command string.
453
454	  Please note that dynamic tick may affect the accuracy of
455	  timekeeping on some platforms depending on the implementation.
456	  Currently at least OMAP, PXA2xx and SA11x0 platforms are known
457	  to have accurate timekeeping with dynamic tick.
458
459config HZ
460	int
461	default 128 if ARCH_L7200
462	default 200 if ARCH_EBSA110 || ARCH_S3C2410
463	default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
464	default 100
465
466config AEABI
467	bool "Use the ARM EABI to compile the kernel"
468	help
469	  This option allows for the kernel to be compiled using the latest
470	  ARM ABI (aka EABI).  This is only useful if you are using a user
471	  space environment that is also compiled with EABI.
472
473	  Since there are major incompatibilities between the legacy ABI and
474	  EABI, especially with regard to structure member alignment, this
475	  option also changes the kernel syscall calling convention to
476	  disambiguate both ABIs and allow for backward compatibility support
477	  (selected with CONFIG_OABI_COMPAT).
478
479	  To use this you need GCC version 4.0.0 or later.
480
481config OABI_COMPAT
482	bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
483	depends on AEABI && EXPERIMENTAL
484	default y
485	help
486	  This option preserves the old syscall interface along with the
487	  new (ARM EABI) one. It also provides a compatibility layer to
488	  intercept syscalls that have structure arguments which layout
489	  in memory differs between the legacy ABI and the new ARM EABI
490	  (only for non "thumb" binaries). This option adds a tiny
491	  overhead to all syscalls and produces a slightly larger kernel.
492	  If you know you'll be using only pure EABI user space then you
493	  can say N here. If this option is not selected and you attempt
494	  to execute a legacy ABI binary then the result will be
495	  UNPREDICTABLE (in fact it can be predicted that it won't work
496	  at all). If in doubt say Y.
497
498config ARCH_DISCONTIGMEM_ENABLE
499	bool
500	default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
501	help
502	  Say Y to support efficient handling of discontiguous physical memory,
503	  for architectures which are either NUMA (Non-Uniform Memory Access)
504	  or have huge holes in the physical address space for other reasons.
505	  See <file:Documentation/vm/numa> for more.
506
507source "mm/Kconfig"
508
509config LEDS
510	bool "Timer and CPU usage LEDs"
511	depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
512		   ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
513		   ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
514		   ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
515		   ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
516		   ARCH_AT91RM9200
517	help
518	  If you say Y here, the LEDs on your machine will be used
519	  to provide useful information about your current system status.
520
521	  If you are compiling a kernel for a NetWinder or EBSA-285, you will
522	  be able to select which LEDs are active using the options below. If
523	  you are compiling a kernel for the EBSA-110 or the LART however, the
524	  red LED will simply flash regularly to indicate that the system is
525	  still functional. It is safe to say Y here if you have a CATS
526	  system, but the driver will do nothing.
527
528config LEDS_TIMER
529	bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
530			    MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
531	depends on LEDS
532	default y if ARCH_EBSA110
533	help
534	  If you say Y here, one of the system LEDs (the green one on the
535	  NetWinder, the amber one on the EBSA285, or the red one on the LART)
536	  will flash regularly to indicate that the system is still
537	  operational. This is mainly useful to kernel hackers who are
538	  debugging unstable kernels.
539
540	  The LART uses the same LED for both Timer LED and CPU usage LED
541	  functions. You may choose to use both, but the Timer LED function
542	  will overrule the CPU usage LED.
543
544config LEDS_CPU
545	bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
546			!ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
547	depends on LEDS
548	help
549	  If you say Y here, the red LED will be used to give a good real
550	  time indication of CPU usage, by lighting whenever the idle task
551	  is not currently executing.
552
553	  The LART uses the same LED for both Timer LED and CPU usage LED
554	  functions. You may choose to use both, but the Timer LED function
555	  will overrule the CPU usage LED.
556
557config ALIGNMENT_TRAP
558	bool
559	default y if !ARCH_EBSA110
560	help
561	  ARM processors can not fetch/store information which is not
562	  naturally aligned on the bus, i.e., a 4 byte fetch must start at an
563	  address divisible by 4. On 32-bit ARM processors, these non-aligned
564	  fetch/store instructions will be emulated in software if you say
565	  here, which has a severe performance impact. This is necessary for
566	  correct operation of some network protocols. With an IP-only
567	  configuration it is safe to say N, otherwise say Y.
568
569endmenu
570
571menu "Boot options"
572
573# Compressed boot loader in ROM.  Yes, we really want to ask about
574# TEXT and BSS so we preserve their values in the config files.
575config ZBOOT_ROM_TEXT
576	hex "Compressed ROM boot loader base address"
577	default "0"
578	help
579	  The physical address at which the ROM-able zImage is to be
580	  placed in the target.  Platforms which normally make use of
581	  ROM-able zImage formats normally set this to a suitable
582	  value in their defconfig file.
583
584	  If ZBOOT_ROM is not enabled, this has no effect.
585
586config ZBOOT_ROM_BSS
587	hex "Compressed ROM boot loader BSS address"
588	default "0"
589	help
590	  The base address of 64KiB of read/write memory in the target
591	  for the ROM-able zImage, which must be available while the
592	  decompressor is running.  Platforms which normally make use of
593	  ROM-able zImage formats normally set this to a suitable
594	  value in their defconfig file.
595
596	  If ZBOOT_ROM is not enabled, this has no effect.
597
598config ZBOOT_ROM
599	bool "Compressed boot loader in ROM/flash"
600	depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
601	help
602	  Say Y here if you intend to execute your compressed kernel image
603	  (zImage) directly from ROM or flash.  If unsure, say N.
604
605config CMDLINE
606	string "Default kernel command string"
607	default ""
608	help
609	  On some architectures (EBSA110 and CATS), there is currently no way
610	  for the boot loader to pass arguments to the kernel. For these
611	  architectures, you should supply some command-line options at build
612	  time by entering them here. As a minimum, you should specify the
613	  memory size and the root device (e.g., mem=64M root=/dev/nfs).
614
615config XIP_KERNEL
616	bool "Kernel Execute-In-Place from ROM"
617	depends on !ZBOOT_ROM
618	help
619	  Execute-In-Place allows the kernel to run from non-volatile storage
620	  directly addressable by the CPU, such as NOR flash. This saves RAM
621	  space since the text section of the kernel is not loaded from flash
622	  to RAM.  Read-write sections, such as the data section and stack,
623	  are still copied to RAM.  The XIP kernel is not compressed since
624	  it has to run directly from flash, so it will take more space to
625	  store it.  The flash address used to link the kernel object files,
626	  and for storing it, is configuration dependent. Therefore, if you
627	  say Y here, you must know the proper physical address where to
628	  store the kernel image depending on your own flash memory usage.
629
630	  Also note that the make target becomes "make xipImage" rather than
631	  "make zImage" or "make Image".  The final kernel binary to put in
632	  ROM memory will be arch/arm/boot/xipImage.
633
634	  If unsure, say N.
635
636config XIP_PHYS_ADDR
637	hex "XIP Kernel Physical Location"
638	depends on XIP_KERNEL
639	default "0x00080000"
640	help
641	  This is the physical address in your flash memory the kernel will
642	  be linked for and stored to.  This address is dependent on your
643	  own flash usage.
644
645endmenu
646
647if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)
648
649menu "CPU Frequency scaling"
650
651source "drivers/cpufreq/Kconfig"
652
653config CPU_FREQ_SA1100
654	bool
655	depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
656	default y
657
658config CPU_FREQ_SA1110
659	bool
660	depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
661	default y
662
663config CPU_FREQ_INTEGRATOR
664	tristate "CPUfreq driver for ARM Integrator CPUs"
665	depends on ARCH_INTEGRATOR && CPU_FREQ
666	default y
667	help
668	  This enables the CPUfreq driver for ARM Integrator CPUs.
669
670	  For details, take a look at <file:Documentation/cpu-freq>.
671
672	  If in doubt, say Y.
673
674endmenu
675
676endif
677
678menu "Floating point emulation"
679
680comment "At least one emulation must be selected"
681
682config FPE_NWFPE
683	bool "NWFPE math emulation"
684	depends on !AEABI || OABI_COMPAT
685	---help---
686	  Say Y to include the NWFPE floating point emulator in the kernel.
687	  This is necessary to run most binaries. Linux does not currently
688	  support floating point hardware so you need to say Y here even if
689	  your machine has an FPA or floating point co-processor podule.
690
691	  You may say N here if you are going to load the Acorn FPEmulator
692	  early in the bootup.
693
694config FPE_NWFPE_XP
695	bool "Support extended precision"
696	depends on FPE_NWFPE
697	help
698	  Say Y to include 80-bit support in the kernel floating-point
699	  emulator.  Otherwise, only 32 and 64-bit support is compiled in.
700	  Note that gcc does not generate 80-bit operations by default,
701	  so in most cases this option only enlarges the size of the
702	  floating point emulator without any good reason.
703
704	  You almost surely want to say N here.
705
706config FPE_FASTFPE
707	bool "FastFPE math emulation (EXPERIMENTAL)"
708	depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
709	---help---
710	  Say Y here to include the FAST floating point emulator in the kernel.
711	  This is an experimental much faster emulator which now also has full
712	  precision for the mantissa.  It does not support any exceptions.
713	  It is very simple, and approximately 3-6 times faster than NWFPE.
714
715	  It should be sufficient for most programs.  It may be not suitable
716	  for scientific calculations, but you have to check this for yourself.
717	  If you do not feel you need a faster FP emulation you should better
718	  choose NWFPE.
719
720config VFP
721	bool "VFP-format floating point maths"
722	depends on CPU_V6 || CPU_ARM926T
723	help
724	  Say Y to include VFP support code in the kernel. This is needed
725	  if your hardware includes a VFP unit.
726
727	  Please see <file:Documentation/arm/VFP/release-notes.txt> for
728	  release notes and additional status information.
729
730	  Say N if your target does not have VFP hardware.
731
732endmenu
733
734menu "Userspace binary formats"
735
736source "fs/Kconfig.binfmt"
737
738config ARTHUR
739	tristate "RISC OS personality"
740	depends on !AEABI
741	help
742	  Say Y here to include the kernel code necessary if you want to run
743	  Acorn RISC OS/Arthur binaries under Linux. This code is still very
744	  experimental; if this sounds frightening, say N and sleep in peace.
745	  You can also say M here to compile this support as a module (which
746	  will be called arthur).
747
748endmenu
749
750menu "Power management options"
751
752source "kernel/power/Kconfig"
753
754config APM
755	tristate "Advanced Power Management Emulation"
756	---help---
757	  APM is a BIOS specification for saving power using several different
758	  techniques. This is mostly useful for battery powered laptops with
759	  APM compliant BIOSes. If you say Y here, the system time will be
760	  reset after a RESUME operation, the /proc/apm device will provide
761	  battery status information, and user-space programs will receive
762	  notification of APM "events" (e.g. battery status change).
763
764	  In order to use APM, you will need supporting software. For location
765	  and more information, read <file:Documentation/pm.txt> and the
766	  Battery Powered Linux mini-HOWTO, available from
767	  <http://www.tldp.org/docs.html#howto>.
768
769	  This driver does not spin down disk drives (see the hdparm(8)
770	  manpage ("man 8 hdparm") for that), and it doesn't turn off
771	  VESA-compliant "green" monitors.
772
773	  Generally, if you don't have a battery in your machine, there isn't
774	  much point in using this driver and you should say N. If you get
775	  random kernel OOPSes or reboots that don't seem to be related to
776	  anything, try disabling/enabling this option (or disabling/enabling
777	  APM in your BIOS).
778
779endmenu
780
781source "net/Kconfig"
782
783menu "Device Drivers"
784
785source "drivers/base/Kconfig"
786
787source "drivers/connector/Kconfig"
788
789if ALIGNMENT_TRAP
790source "drivers/mtd/Kconfig"
791endif
792
793source "drivers/parport/Kconfig"
794
795source "drivers/pnp/Kconfig"
796
797source "drivers/block/Kconfig"
798
799source "drivers/acorn/block/Kconfig"
800
801if PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \
802	|| ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
803	|| ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
804	|| ARCH_IXP23XX
805source "drivers/ide/Kconfig"
806endif
807
808source "drivers/scsi/Kconfig"
809
810source "drivers/md/Kconfig"
811
812source "drivers/message/fusion/Kconfig"
813
814source "drivers/ieee1394/Kconfig"
815
816source "drivers/message/i2o/Kconfig"
817
818source "drivers/net/Kconfig"
819
820source "drivers/isdn/Kconfig"
821
822# input before char - char/joystick depends on it. As does USB.
823
824source "drivers/input/Kconfig"
825
826source "drivers/char/Kconfig"
827
828source "drivers/i2c/Kconfig"
829
830source "drivers/spi/Kconfig"
831
832source "drivers/w1/Kconfig"
833
834source "drivers/hwmon/Kconfig"
835
836#source "drivers/l3/Kconfig"
837
838source "drivers/misc/Kconfig"
839
840source "drivers/mfd/Kconfig"
841
842source "drivers/media/Kconfig"
843
844source "drivers/video/Kconfig"
845
846source "sound/Kconfig"
847
848source "drivers/usb/Kconfig"
849
850source "drivers/mmc/Kconfig"
851
852source "drivers/rtc/Kconfig"
853
854endmenu
855
856source "fs/Kconfig"
857
858source "arch/arm/oprofile/Kconfig"
859
860source "arch/arm/Kconfig.debug"
861
862source "security/Kconfig"
863
864source "crypto/Kconfig"
865
866source "lib/Kconfig"
867