2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
14 select SYS_SUPPORTS_APM_EMULATION
17 select HAVE_KPROBES if (!XIP_KERNEL)
18 select HAVE_KRETPROBES if (HAVE_KPROBES)
19 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
20 select HAVE_GENERIC_DMA_COHERENT
22 The ARM series is a line of low-power-consumption RISC chip designs
23 licensed by ARM Ltd and targeted at embedded applications and
24 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
25 manufactured, but legacy ARM-based PC hardware remains popular in
26 Europe. There is an ARM Linux project with a web page at
27 <http://www.arm.linux.org.uk/>.
32 config SYS_SUPPORTS_APM_EMULATION
41 config GENERIC_CLOCKEVENTS
44 config GENERIC_CLOCKEVENTS_BROADCAST
46 depends on GENERIC_CLOCKEVENTS
47 default y if SMP && !LOCAL_TIMERS
59 The Extended Industry Standard Architecture (EISA) bus was
60 developed as an open alternative to the IBM MicroChannel bus.
62 The EISA bus provided some of the features of the IBM MicroChannel
63 bus while maintaining backward compatibility with cards made for
64 the older ISA bus. The EISA bus saw limited use between 1988 and
65 1995 when it was made obsolete by the PCI bus.
67 Say Y here if you are building a kernel for an EISA-based machine.
77 MicroChannel Architecture is found in some IBM PS/2 machines and
78 laptops. It is a bus system similar to PCI or ISA. See
79 <file:Documentation/mca.txt> (and especially the web page given
80 there) before attempting to build an MCA bus kernel.
82 config GENERIC_HARDIRQS
86 config STACKTRACE_SUPPORT
90 config HAVE_LATENCYTOP_SUPPORT
95 config LOCKDEP_SUPPORT
99 config TRACE_IRQFLAGS_SUPPORT
103 config HARDIRQS_SW_RESEND
107 config GENERIC_IRQ_PROBE
111 config GENERIC_LOCKBREAK
114 depends on SMP && PREEMPT
116 config RWSEM_GENERIC_SPINLOCK
120 config RWSEM_XCHGADD_ALGORITHM
123 config ARCH_HAS_ILOG2_U32
126 config ARCH_HAS_ILOG2_U64
129 config GENERIC_HWEIGHT
133 config GENERIC_CALIBRATE_DELAY
137 config ARCH_MAY_HAVE_PC_FDC
143 config GENERIC_ISA_DMA
152 config GENERIC_HARDIRQS_NO__DO_IRQ
157 config OPROFILE_ARMV6
159 depends on CPU_V6 && !SMP
160 select OPROFILE_ARM11_CORE
162 config OPROFILE_MPCORE
164 depends on CPU_V6 && SMP
165 select OPROFILE_ARM11_CORE
167 config OPROFILE_ARM11_CORE
170 config OPROFILE_ARMV7
172 depends on CPU_V7 && !SMP
179 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
180 default DRAM_BASE if REMAP_VECTORS_TO_RAM
183 The base address of exception vectors.
185 source "init/Kconfig"
187 source "kernel/Kconfig.freezer"
192 prompt "ARM system type"
193 default ARCH_VERSATILE
196 bool "Agilent AAEC-2000 based"
201 This enables support for systems based on the Agilent AAEC-2000
203 config ARCH_INTEGRATOR
204 bool "ARM Ltd. Integrator family"
210 Support for ARM's Integrator platform.
213 bool "ARM Ltd. RealView family"
219 select GENERIC_CLOCKEVENTS
221 This enables support for ARM Ltd RealView boards.
223 config ARCH_VERSATILE
224 bool "ARM Ltd. Versatile family"
231 select GENERIC_CLOCKEVENTS
233 This enables support for ARM Ltd Versatile board.
238 select ARCH_REQUIRE_GPIOLIB
241 This enables support for systems based on the Atmel AT91RM9200,
242 AT91SAM9 and AT91CAP9 processors.
245 bool "Cirrus Logic CLPS711x/EP721x-based"
248 Support for Cirrus Logic 711x/721x based boards.
251 bool "Cortina Systems Gemini"
254 select ARCH_REQUIRE_GPIOLIB
256 Support for the Cortina Systems Gemini family SoCs
264 This is an evaluation board for the StrongARM processor available
265 from Digital. It has limited hardware on-board, including an
266 Ethernet interface, two PCMCIA sockets, two serial ports and a
277 select ARCH_REQUIRE_GPIOLIB
278 select ARCH_HAS_HOLES_MEMORYMODEL
280 This enables support for the Cirrus EP93xx series of CPUs.
282 config ARCH_FOOTBRIDGE
287 Support for systems based on the DC21285 companion chip
288 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
291 bool "Freescale MXC/iMX-based"
293 select GENERIC_CLOCKEVENTS
296 select ARCH_REQUIRE_GPIOLIB
299 Support for Freescale MXC/iMX-based family of processors
302 bool "Freescale STMP3xxx"
306 select ARCH_REQUIRE_GPIOLIB
308 select GENERIC_CLOCKEVENTS
310 select USB_ARCH_HAS_EHCI
312 Support for systems based on the Freescale 3xxx CPUs.
315 bool "Hilscher NetX based"
318 select GENERIC_CLOCKEVENTS
321 This enables support for systems based on the Hilscher NetX Soc
324 bool "Hynix HMS720x-based"
328 This enables support for systems based on the Hynix HMS720x
336 select ARCH_SUPPORTS_MSI
339 Support for Intel's IOP13XX (XScale) family of processors.
348 select ARCH_REQUIRE_GPIOLIB
350 Support for Intel's 80219 and IOP32X (XScale) family of
360 select ARCH_REQUIRE_GPIOLIB
362 Support for Intel's IOP33X (XScale) family of processors.
370 Support for Intel's IXP23xx (XScale) family of processors.
373 bool "IXP2400/2800-based"
378 Support for Intel's IXP2400/2800 (XScale) family of processors.
386 select GENERIC_CLOCKEVENTS
387 select DMABOUNCE if PCI
389 Support for Intel's IXP4XX (XScale) family of processors.
396 Say Y here if you intend to run this kernel on a LinkUp Systems
397 L7200 Software Development Board which uses an ARM720T processor.
398 Information on this board can be obtained at:
400 <http://www.linkupsys.com/>
402 If you have any questions or comments about the Linux kernel port
403 to this board, send e-mail to <sjhill@cotw.com>.
406 bool "Marvell Kirkwood"
410 select ARCH_REQUIRE_GPIOLIB
412 select GENERIC_CLOCKEVENTS
415 Support for the following Marvell Kirkwood series SoCs:
416 88F6180, 88F6192 and 88F6281.
419 bool "Marvell Loki (88RC8480)"
422 select GENERIC_CLOCKEVENTS
425 Support for the Marvell Loki (88RC8480) SoC.
428 bool "Marvell MV78xx0"
432 select ARCH_REQUIRE_GPIOLIB
434 select GENERIC_CLOCKEVENTS
437 Support for the following Marvell MV78xx0 series SoCs:
446 select ARCH_REQUIRE_GPIOLIB
448 select GENERIC_CLOCKEVENTS
451 Support for the following Marvell Orion 5x series SoCs:
452 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
453 Orion-2 (5281), Orion-1-90 (6183).
456 bool "Marvell PXA168/910"
459 select ARCH_REQUIRE_GPIOLIB
463 select GENERIC_CLOCKEVENTS
467 Support for Marvell's PXA168/910 processor line.
470 bool "Micrel/Kendin KS8695"
473 select ARCH_REQUIRE_GPIOLIB
475 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
476 System-on-Chip devices.
479 bool "NetSilicon NS9xxx"
483 select GENERIC_CLOCKEVENTS
486 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
489 <http://www.digi.com/products/microprocessors/index.jsp>
492 bool "Nuvoton W90X900 CPU"
494 select ARCH_REQUIRE_GPIOLIB
498 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
499 can login www.mcuos.com or www.nuvoton.com to know more.
502 bool "Philips Nexperia PNX4008 Mobile"
506 This enables support for Philips PNX4008 mobile platform.
509 bool "PXA2xx/PXA3xx-based"
515 select ARCH_REQUIRE_GPIOLIB
517 select GENERIC_CLOCKEVENTS
521 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
527 select GENERIC_CLOCKEVENTS
529 Support for Qualcomm MSM7K based systems. This runs on the ARM11
530 apps processor of the MSM7K and depends on a shared memory
531 interface to the ARM9 modem processor which runs the baseband stack
532 and controls some vital subsystems (clock and power control, etc).
539 select ARCH_MAY_HAVE_PC_FDC
540 select HAVE_PATA_PLATFORM
543 select ARCH_SPARSEMEM_ENABLE
545 On the Acorn Risc-PC, Linux can support the internal IDE disk and
546 CD-ROM interface, serial and parallel port, and the floppy drive.
552 select ARCH_SPARSEMEM_ENABLE
556 select GENERIC_CLOCKEVENTS
559 select ARCH_REQUIRE_GPIOLIB
561 Support for StrongARM 11x0 based boards.
564 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
568 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
569 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
570 the Samsung SMDK2410 development board (and derivatives).
573 bool "Samsung S3C64XX"
577 Samsung S3C64XX series based systems
587 Support for the StrongARM based Digital DNARD machine, also known
588 as "Shark" (<http://www.shark-linux.de/shark.html>).
593 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
594 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
596 Say Y here for systems based on one of the Sharp LH7A40X
597 System on a Chip processors. These CPUs include an ARM922T
598 core with a wide array of integrated devices for
599 hand-held and low-power applications.
602 bool "ST-Ericsson U300 Series"
608 select GENERIC_CLOCKEVENTS
613 Support for ST-Ericsson U300 series mobile platforms.
619 select GENERIC_CLOCKEVENTS
621 select ARCH_REQUIRE_GPIOLIB
626 select GENERIC_ALLOCATOR
628 Support for TI's DaVinci platform.
634 select ARCH_REQUIRE_GPIOLIB
636 select GENERIC_CLOCKEVENTS
638 Support for TI's OMAP platform (OMAP1 and OMAP2).
642 source "arch/arm/mach-clps711x/Kconfig"
644 source "arch/arm/mach-ep93xx/Kconfig"
646 source "arch/arm/mach-footbridge/Kconfig"
648 source "arch/arm/mach-gemini/Kconfig"
650 source "arch/arm/mach-integrator/Kconfig"
652 source "arch/arm/mach-iop32x/Kconfig"
654 source "arch/arm/mach-iop33x/Kconfig"
656 source "arch/arm/mach-iop13xx/Kconfig"
658 source "arch/arm/mach-ixp4xx/Kconfig"
660 source "arch/arm/mach-ixp2000/Kconfig"
662 source "arch/arm/mach-ixp23xx/Kconfig"
664 source "arch/arm/mach-loki/Kconfig"
666 source "arch/arm/mach-mv78xx0/Kconfig"
668 source "arch/arm/mach-pxa/Kconfig"
669 source "arch/arm/plat-pxa/Kconfig"
671 source "arch/arm/mach-mmp/Kconfig"
673 source "arch/arm/mach-sa1100/Kconfig"
675 source "arch/arm/plat-omap/Kconfig"
677 source "arch/arm/mach-omap1/Kconfig"
679 source "arch/arm/mach-omap2/Kconfig"
681 source "arch/arm/mach-orion5x/Kconfig"
683 source "arch/arm/mach-kirkwood/Kconfig"
685 source "arch/arm/plat-s3c24xx/Kconfig"
686 source "arch/arm/plat-s3c64xx/Kconfig"
687 source "arch/arm/plat-s3c/Kconfig"
690 source "arch/arm/mach-s3c2400/Kconfig"
691 source "arch/arm/mach-s3c2410/Kconfig"
692 source "arch/arm/mach-s3c2412/Kconfig"
693 source "arch/arm/mach-s3c2440/Kconfig"
694 source "arch/arm/mach-s3c2442/Kconfig"
695 source "arch/arm/mach-s3c2443/Kconfig"
699 source "arch/arm/mach-s3c6400/Kconfig"
700 source "arch/arm/mach-s3c6410/Kconfig"
703 source "arch/arm/plat-stmp3xxx/Kconfig"
705 source "arch/arm/mach-lh7a40x/Kconfig"
707 source "arch/arm/mach-h720x/Kconfig"
709 source "arch/arm/mach-versatile/Kconfig"
711 source "arch/arm/mach-aaec2000/Kconfig"
713 source "arch/arm/mach-realview/Kconfig"
715 source "arch/arm/mach-at91/Kconfig"
717 source "arch/arm/plat-mxc/Kconfig"
719 source "arch/arm/mach-netx/Kconfig"
721 source "arch/arm/mach-ns9xxx/Kconfig"
723 source "arch/arm/mach-davinci/Kconfig"
725 source "arch/arm/mach-ks8695/Kconfig"
727 source "arch/arm/mach-msm/Kconfig"
729 source "arch/arm/mach-u300/Kconfig"
731 source "arch/arm/mach-w90x900/Kconfig"
733 # Definitions to make life easier
746 source arch/arm/mm/Kconfig
749 bool "Enable iWMMXt support"
750 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
751 default y if PXA27x || PXA3xx || ARCH_MMP
753 Enable support for iWMMXt context switching at run time if
754 running on a CPU that supports it.
756 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
759 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
763 source "arch/arm/Kconfig-nommu"
766 config ARM_ERRATA_411920
767 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
768 depends on CPU_V6 && !SMP
770 Invalidation of the Instruction Cache operation can
771 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
772 It does not affect the MPCore. This option enables the ARM Ltd.
773 recommended workaround.
775 config ARM_ERRATA_430973
776 bool "ARM errata: Stale prediction on replaced interworking branch"
779 This option enables the workaround for the 430973 Cortex-A8
780 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
781 interworking branch is replaced with another code sequence at the
782 same virtual address, whether due to self-modifying code or virtual
783 to physical address re-mapping, Cortex-A8 does not recover from the
784 stale interworking branch prediction. This results in Cortex-A8
785 executing the new code sequence in the incorrect ARM or Thumb state.
786 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
787 and also flushes the branch target cache at every context switch.
788 Note that setting specific bits in the ACTLR register may not be
789 available in non-secure mode.
791 config ARM_ERRATA_458693
792 bool "ARM errata: Processor deadlock when a false hazard is created"
795 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
796 erratum. For very specific sequences of memory operations, it is
797 possible for a hazard condition intended for a cache line to instead
798 be incorrectly associated with a different cache line. This false
799 hazard might then cause a processor deadlock. The workaround enables
800 the L1 caching of the NEON accesses and disables the PLD instruction
801 in the ACTLR register. Note that setting specific bits in the ACTLR
802 register may not be available in non-secure mode.
804 config ARM_ERRATA_460075
805 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
808 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
809 erratum. Any asynchronous access to the L2 cache may encounter a
810 situation in which recent store transactions to the L2 cache are lost
811 and overwritten with stale memory contents from external memory. The
812 workaround disables the write-allocate mode for the L2 cache via the
813 ACTLR register. Note that setting specific bits in the ACTLR register
814 may not be available in non-secure mode.
818 source "arch/arm/common/Kconfig"
820 config FORCE_MAX_ZONEORDER
833 Find out whether you have ISA slots on your motherboard. ISA is the
834 name of a bus system, i.e. the way the CPU talks to the other stuff
835 inside your box. Other bus systems are PCI, EISA, MicroChannel
836 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
837 newer boards don't support it. If you have ISA, say Y, otherwise N.
839 # Select ISA DMA controller support
844 # Select ISA DMA interface
849 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
851 Find out whether you have a PCI motherboard. PCI is the name of a
852 bus system, i.e. the way the CPU talks to the other stuff inside
853 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
854 VESA. If you have PCI, say Y, otherwise N.
859 # Select the host bridge type
860 config PCI_HOST_VIA82C505
862 depends on PCI && ARCH_SHARK
865 config PCI_HOST_ITE8152
867 depends on PCI && MACH_ARMCORE
871 source "drivers/pci/Kconfig"
873 source "drivers/pcmcia/Kconfig"
877 menu "Kernel Features"
879 source "kernel/time/Kconfig"
882 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
883 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
884 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
885 depends on GENERIC_CLOCKEVENTS
886 select USE_GENERIC_SMP_HELPERS
887 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
889 This enables support for systems with more than one CPU. If you have
890 a system with only one CPU, like most personal computers, say N. If
891 you have a system with more than one CPU, say Y.
893 If you say N here, the kernel will run on single and multiprocessor
894 machines, but will use only one CPU of a multiprocessor machine. If
895 you say Y here, the kernel will run on many, but not all, single
896 processor machines. On a single processor machine, the kernel will
897 run faster if you say N here.
899 See also <file:Documentation/i386/IO-APIC.txt>,
900 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
901 <http://www.linuxdoc.org/docs.html#howto>.
903 If you don't know what to do here, say N.
909 This option enables support for the ARM system coherency unit
915 This options enables support for the ARM timer and watchdog unit
918 prompt "Memory split"
921 Select the desired split between kernel and user memory.
923 If you are not absolutely sure what you are doing, leave this
927 bool "3G/1G user/kernel split"
929 bool "2G/2G user/kernel split"
931 bool "1G/3G user/kernel split"
936 default 0x40000000 if VMSPLIT_1G
937 default 0x80000000 if VMSPLIT_2G
941 int "Maximum number of CPUs (2-32)"
947 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
948 depends on SMP && HOTPLUG && EXPERIMENTAL
950 Say Y here to experiment with turning CPUs off and on. CPUs
951 can be controlled through /sys/devices/system/cpu.
954 bool "Use local timer interrupts"
955 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
956 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
958 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
960 Enable support for local timers on SMP platforms, rather then the
961 legacy IPI broadcast method. Local timers allows the system
962 accounting to be spread across the timer interval, preventing a
963 "thundering herd" at every timer tick.
965 source kernel/Kconfig.preempt
969 default 128 if ARCH_L7200
970 default 200 if ARCH_EBSA110 || ARCH_S3C2410
971 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
972 default AT91_TIMER_HZ if ARCH_AT91
976 bool "Use the ARM EABI to compile the kernel"
978 This option allows for the kernel to be compiled using the latest
979 ARM ABI (aka EABI). This is only useful if you are using a user
980 space environment that is also compiled with EABI.
982 Since there are major incompatibilities between the legacy ABI and
983 EABI, especially with regard to structure member alignment, this
984 option also changes the kernel syscall calling convention to
985 disambiguate both ABIs and allow for backward compatibility support
986 (selected with CONFIG_OABI_COMPAT).
988 To use this you need GCC version 4.0.0 or later.
991 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
992 depends on AEABI && EXPERIMENTAL
995 This option preserves the old syscall interface along with the
996 new (ARM EABI) one. It also provides a compatibility layer to
997 intercept syscalls that have structure arguments which layout
998 in memory differs between the legacy ABI and the new ARM EABI
999 (only for non "thumb" binaries). This option adds a tiny
1000 overhead to all syscalls and produces a slightly larger kernel.
1001 If you know you'll be using only pure EABI user space then you
1002 can say N here. If this option is not selected and you attempt
1003 to execute a legacy ABI binary then the result will be
1004 UNPREDICTABLE (in fact it can be predicted that it won't work
1005 at all). If in doubt say Y.
1007 config ARCH_HAS_HOLES_MEMORYMODEL
1010 # Discontigmem is deprecated
1011 config ARCH_DISCONTIGMEM_ENABLE
1014 config ARCH_SPARSEMEM_ENABLE
1017 config ARCH_SPARSEMEM_DEFAULT
1018 def_bool ARCH_SPARSEMEM_ENABLE
1020 config ARCH_SELECT_MEMORY_MODEL
1021 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1025 default "4" if ARCH_LH7A40X
1027 depends on NEED_MULTIPLE_NODES
1030 bool "High Memory Support (EXPERIMENTAL)"
1031 depends on MMU && EXPERIMENTAL
1033 The address space of ARM processors is only 4 Gigabytes large
1034 and it has to accommodate user address space, kernel address
1035 space as well as some memory mapped IO. That means that, if you
1036 have a large amount of physical memory and/or IO, not all of the
1037 memory can be "permanently mapped" by the kernel. The physical
1038 memory that is not permanently mapped is called "high memory".
1040 Depending on the selected kernel/user memory split, minimum
1041 vmalloc space and actual amount of RAM, you may not need this
1042 option which should result in a slightly faster kernel.
1049 bool "Timer and CPU usage LEDs"
1050 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1051 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1052 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1053 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1054 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1055 ARCH_AT91 || ARCH_DAVINCI || \
1056 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1058 If you say Y here, the LEDs on your machine will be used
1059 to provide useful information about your current system status.
1061 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1062 be able to select which LEDs are active using the options below. If
1063 you are compiling a kernel for the EBSA-110 or the LART however, the
1064 red LED will simply flash regularly to indicate that the system is
1065 still functional. It is safe to say Y here if you have a CATS
1066 system, but the driver will do nothing.
1069 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1070 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1071 || MACH_OMAP_PERSEUS2
1073 depends on !GENERIC_CLOCKEVENTS
1074 default y if ARCH_EBSA110
1076 If you say Y here, one of the system LEDs (the green one on the
1077 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1078 will flash regularly to indicate that the system is still
1079 operational. This is mainly useful to kernel hackers who are
1080 debugging unstable kernels.
1082 The LART uses the same LED for both Timer LED and CPU usage LED
1083 functions. You may choose to use both, but the Timer LED function
1084 will overrule the CPU usage LED.
1087 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1089 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1090 || MACH_OMAP_PERSEUS2
1093 If you say Y here, the red LED will be used to give a good real
1094 time indication of CPU usage, by lighting whenever the idle task
1095 is not currently executing.
1097 The LART uses the same LED for both Timer LED and CPU usage LED
1098 functions. You may choose to use both, but the Timer LED function
1099 will overrule the CPU usage LED.
1101 config ALIGNMENT_TRAP
1103 depends on CPU_CP15_MMU
1104 default y if !ARCH_EBSA110
1106 ARM processors cannot fetch/store information which is not
1107 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1108 address divisible by 4. On 32-bit ARM processors, these non-aligned
1109 fetch/store instructions will be emulated in software if you say
1110 here, which has a severe performance impact. This is necessary for
1111 correct operation of some network protocols. With an IP-only
1112 configuration it is safe to say N, otherwise say Y.
1114 config UACCESS_WITH_MEMCPY
1115 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1116 depends on MMU && EXPERIMENTAL
1117 default y if CPU_FEROCEON
1119 Implement faster copy_to_user and clear_user methods for CPU
1120 cores where a 8-word STM instruction give significantly higher
1121 memory write throughput than a sequence of individual 32bit stores.
1123 A possible side effect is a slight increase in scheduling latency
1124 between threads sharing the same address space if they invoke
1125 such copy operations with large buffers.
1127 However, if the CPU data cache is using a write-allocate mode,
1128 this option is unlikely to provide any performance gain.
1134 # Compressed boot loader in ROM. Yes, we really want to ask about
1135 # TEXT and BSS so we preserve their values in the config files.
1136 config ZBOOT_ROM_TEXT
1137 hex "Compressed ROM boot loader base address"
1140 The physical address at which the ROM-able zImage is to be
1141 placed in the target. Platforms which normally make use of
1142 ROM-able zImage formats normally set this to a suitable
1143 value in their defconfig file.
1145 If ZBOOT_ROM is not enabled, this has no effect.
1147 config ZBOOT_ROM_BSS
1148 hex "Compressed ROM boot loader BSS address"
1151 The base address of an area of read/write memory in the target
1152 for the ROM-able zImage which must be available while the
1153 decompressor is running. It must be large enough to hold the
1154 entire decompressed kernel plus an additional 128 KiB.
1155 Platforms which normally make use of ROM-able zImage formats
1156 normally set this to a suitable value in their defconfig file.
1158 If ZBOOT_ROM is not enabled, this has no effect.
1161 bool "Compressed boot loader in ROM/flash"
1162 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1164 Say Y here if you intend to execute your compressed kernel image
1165 (zImage) directly from ROM or flash. If unsure, say N.
1168 string "Default kernel command string"
1171 On some architectures (EBSA110 and CATS), there is currently no way
1172 for the boot loader to pass arguments to the kernel. For these
1173 architectures, you should supply some command-line options at build
1174 time by entering them here. As a minimum, you should specify the
1175 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1178 bool "Kernel Execute-In-Place from ROM"
1179 depends on !ZBOOT_ROM
1181 Execute-In-Place allows the kernel to run from non-volatile storage
1182 directly addressable by the CPU, such as NOR flash. This saves RAM
1183 space since the text section of the kernel is not loaded from flash
1184 to RAM. Read-write sections, such as the data section and stack,
1185 are still copied to RAM. The XIP kernel is not compressed since
1186 it has to run directly from flash, so it will take more space to
1187 store it. The flash address used to link the kernel object files,
1188 and for storing it, is configuration dependent. Therefore, if you
1189 say Y here, you must know the proper physical address where to
1190 store the kernel image depending on your own flash memory usage.
1192 Also note that the make target becomes "make xipImage" rather than
1193 "make zImage" or "make Image". The final kernel binary to put in
1194 ROM memory will be arch/arm/boot/xipImage.
1198 config XIP_PHYS_ADDR
1199 hex "XIP Kernel Physical Location"
1200 depends on XIP_KERNEL
1201 default "0x00080000"
1203 This is the physical address in your flash memory the kernel will
1204 be linked for and stored to. This address is dependent on your
1208 bool "Kexec system call (EXPERIMENTAL)"
1209 depends on EXPERIMENTAL
1211 kexec is a system call that implements the ability to shutdown your
1212 current kernel, and to start another kernel. It is like a reboot
1213 but it is independent of the system firmware. And like a reboot
1214 you can start any kernel with it, not just Linux.
1216 It is an ongoing process to be certain the hardware in a machine
1217 is properly shutdown, so do not be surprised if this code does not
1218 initially work for you. It may help to enable device hotplugging
1222 bool "Export atags in procfs"
1226 Should the atags used to boot the kernel be exported in an "atags"
1227 file in procfs. Useful with kexec.
1231 menu "CPU Power Management"
1233 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA || ARCH_S3C64XX)
1235 source "drivers/cpufreq/Kconfig"
1237 config CPU_FREQ_SA1100
1239 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1242 config CPU_FREQ_SA1110
1244 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1247 config CPU_FREQ_INTEGRATOR
1248 tristate "CPUfreq driver for ARM Integrator CPUs"
1249 depends on ARCH_INTEGRATOR && CPU_FREQ
1252 This enables the CPUfreq driver for ARM Integrator CPUs.
1254 For details, take a look at <file:Documentation/cpu-freq>.
1260 depends on CPU_FREQ && ARCH_PXA && PXA25x
1262 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1264 config CPU_FREQ_S3C64XX
1265 bool "CPUfreq support for Samsung S3C64XX CPUs"
1266 depends on CPU_FREQ && CPU_S3C6410
1270 source "drivers/cpuidle/Kconfig"
1274 menu "Floating point emulation"
1276 comment "At least one emulation must be selected"
1279 bool "NWFPE math emulation"
1280 depends on !AEABI || OABI_COMPAT
1282 Say Y to include the NWFPE floating point emulator in the kernel.
1283 This is necessary to run most binaries. Linux does not currently
1284 support floating point hardware so you need to say Y here even if
1285 your machine has an FPA or floating point co-processor podule.
1287 You may say N here if you are going to load the Acorn FPEmulator
1288 early in the bootup.
1291 bool "Support extended precision"
1292 depends on FPE_NWFPE
1294 Say Y to include 80-bit support in the kernel floating-point
1295 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1296 Note that gcc does not generate 80-bit operations by default,
1297 so in most cases this option only enlarges the size of the
1298 floating point emulator without any good reason.
1300 You almost surely want to say N here.
1303 bool "FastFPE math emulation (EXPERIMENTAL)"
1304 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1306 Say Y here to include the FAST floating point emulator in the kernel.
1307 This is an experimental much faster emulator which now also has full
1308 precision for the mantissa. It does not support any exceptions.
1309 It is very simple, and approximately 3-6 times faster than NWFPE.
1311 It should be sufficient for most programs. It may be not suitable
1312 for scientific calculations, but you have to check this for yourself.
1313 If you do not feel you need a faster FP emulation you should better
1317 bool "VFP-format floating point maths"
1318 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1320 Say Y to include VFP support code in the kernel. This is needed
1321 if your hardware includes a VFP unit.
1323 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1324 release notes and additional status information.
1326 Say N if your target does not have VFP hardware.
1334 bool "Advanced SIMD (NEON) Extension support"
1335 depends on VFPv3 && CPU_V7
1337 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1342 menu "Userspace binary formats"
1344 source "fs/Kconfig.binfmt"
1347 tristate "RISC OS personality"
1350 Say Y here to include the kernel code necessary if you want to run
1351 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1352 experimental; if this sounds frightening, say N and sleep in peace.
1353 You can also say M here to compile this support as a module (which
1354 will be called arthur).
1358 menu "Power management options"
1360 source "kernel/power/Kconfig"
1362 config ARCH_SUSPEND_POSSIBLE
1367 source "net/Kconfig"
1369 source "drivers/Kconfig"
1373 source "arch/arm/Kconfig.debug"
1375 source "security/Kconfig"
1377 source "crypto/Kconfig"
1379 source "lib/Kconfig"