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
220 select ARCH_WANT_OPTIONAL_GPIOLIB
222 This enables support for ARM Ltd RealView boards.
224 config ARCH_VERSATILE
225 bool "ARM Ltd. Versatile family"
232 select GENERIC_CLOCKEVENTS
233 select ARCH_WANT_OPTIONAL_GPIOLIB
235 This enables support for ARM Ltd Versatile board.
240 select ARCH_REQUIRE_GPIOLIB
243 This enables support for systems based on the Atmel AT91RM9200,
244 AT91SAM9 and AT91CAP9 processors.
247 bool "Cirrus Logic CLPS711x/EP721x-based"
250 Support for Cirrus Logic 711x/721x based boards.
253 bool "Cortina Systems Gemini"
256 select ARCH_REQUIRE_GPIOLIB
258 Support for the Cortina Systems Gemini family SoCs
266 This is an evaluation board for the StrongARM processor available
267 from Digital. It has limited hardware on-board, including an
268 Ethernet interface, two PCMCIA sockets, two serial ports and a
279 select ARCH_REQUIRE_GPIOLIB
280 select ARCH_HAS_HOLES_MEMORYMODEL
282 This enables support for the Cirrus EP93xx series of CPUs.
284 config ARCH_FOOTBRIDGE
289 Support for systems based on the DC21285 companion chip
290 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
293 bool "Freescale MXC/iMX-based"
295 select GENERIC_CLOCKEVENTS
298 select ARCH_REQUIRE_GPIOLIB
301 Support for Freescale MXC/iMX-based family of processors
304 bool "Freescale STMP3xxx"
308 select ARCH_REQUIRE_GPIOLIB
310 select GENERIC_CLOCKEVENTS
312 select USB_ARCH_HAS_EHCI
314 Support for systems based on the Freescale 3xxx CPUs.
317 bool "Hilscher NetX based"
320 select GENERIC_CLOCKEVENTS
323 This enables support for systems based on the Hilscher NetX Soc
326 bool "Hynix HMS720x-based"
330 This enables support for systems based on the Hynix HMS720x
338 select ARCH_SUPPORTS_MSI
341 Support for Intel's IOP13XX (XScale) family of processors.
350 select ARCH_REQUIRE_GPIOLIB
352 Support for Intel's 80219 and IOP32X (XScale) family of
362 select ARCH_REQUIRE_GPIOLIB
364 Support for Intel's IOP33X (XScale) family of processors.
372 Support for Intel's IXP23xx (XScale) family of processors.
375 bool "IXP2400/2800-based"
380 Support for Intel's IXP2400/2800 (XScale) family of processors.
388 select GENERIC_CLOCKEVENTS
389 select DMABOUNCE if PCI
391 Support for Intel's IXP4XX (XScale) family of processors.
398 Say Y here if you intend to run this kernel on a LinkUp Systems
399 L7200 Software Development Board which uses an ARM720T processor.
400 Information on this board can be obtained at:
402 <http://www.linkupsys.com/>
404 If you have any questions or comments about the Linux kernel port
405 to this board, send e-mail to <sjhill@cotw.com>.
408 bool "Marvell Kirkwood"
412 select ARCH_REQUIRE_GPIOLIB
414 select GENERIC_CLOCKEVENTS
417 Support for the following Marvell Kirkwood series SoCs:
418 88F6180, 88F6192 and 88F6281.
421 bool "Marvell Loki (88RC8480)"
424 select GENERIC_CLOCKEVENTS
427 Support for the Marvell Loki (88RC8480) SoC.
430 bool "Marvell MV78xx0"
434 select ARCH_REQUIRE_GPIOLIB
436 select GENERIC_CLOCKEVENTS
439 Support for the following Marvell MV78xx0 series SoCs:
448 select ARCH_REQUIRE_GPIOLIB
450 select GENERIC_CLOCKEVENTS
453 Support for the following Marvell Orion 5x series SoCs:
454 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
455 Orion-2 (5281), Orion-1-90 (6183).
458 bool "Marvell PXA168/910"
461 select ARCH_REQUIRE_GPIOLIB
465 select GENERIC_CLOCKEVENTS
469 Support for Marvell's PXA168/910 processor line.
472 bool "Micrel/Kendin KS8695"
475 select ARCH_REQUIRE_GPIOLIB
477 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
478 System-on-Chip devices.
481 bool "NetSilicon NS9xxx"
485 select GENERIC_CLOCKEVENTS
488 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
491 <http://www.digi.com/products/microprocessors/index.jsp>
494 bool "Nuvoton W90X900 CPU"
496 select ARCH_REQUIRE_GPIOLIB
500 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
501 can login www.mcuos.com or www.nuvoton.com to know more.
504 bool "Philips Nexperia PNX4008 Mobile"
508 This enables support for Philips PNX4008 mobile platform.
511 bool "PXA2xx/PXA3xx-based"
517 select ARCH_REQUIRE_GPIOLIB
519 select GENERIC_CLOCKEVENTS
523 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
529 select GENERIC_CLOCKEVENTS
531 Support for Qualcomm MSM7K based systems. This runs on the ARM11
532 apps processor of the MSM7K and depends on a shared memory
533 interface to the ARM9 modem processor which runs the baseband stack
534 and controls some vital subsystems (clock and power control, etc).
541 select ARCH_MAY_HAVE_PC_FDC
542 select HAVE_PATA_PLATFORM
545 select ARCH_SPARSEMEM_ENABLE
547 On the Acorn Risc-PC, Linux can support the internal IDE disk and
548 CD-ROM interface, serial and parallel port, and the floppy drive.
554 select ARCH_SPARSEMEM_ENABLE
558 select GENERIC_CLOCKEVENTS
561 select ARCH_REQUIRE_GPIOLIB
563 Support for StrongARM 11x0 based boards.
566 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
570 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
571 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
572 the Samsung SMDK2410 development board (and derivatives).
575 bool "Samsung S3C64XX"
579 Samsung S3C64XX series based systems
589 Support for the StrongARM based Digital DNARD machine, also known
590 as "Shark" (<http://www.shark-linux.de/shark.html>).
595 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
596 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
598 Say Y here for systems based on one of the Sharp LH7A40X
599 System on a Chip processors. These CPUs include an ARM922T
600 core with a wide array of integrated devices for
601 hand-held and low-power applications.
604 bool "ST-Ericsson U300 Series"
610 select GENERIC_CLOCKEVENTS
615 Support for ST-Ericsson U300 series mobile platforms.
621 select GENERIC_CLOCKEVENTS
623 select ARCH_REQUIRE_GPIOLIB
628 select GENERIC_ALLOCATOR
630 Support for TI's DaVinci platform.
636 select ARCH_REQUIRE_GPIOLIB
638 select GENERIC_CLOCKEVENTS
640 Support for TI's OMAP platform (OMAP1 and OMAP2).
644 source "arch/arm/mach-clps711x/Kconfig"
646 source "arch/arm/mach-ep93xx/Kconfig"
648 source "arch/arm/mach-footbridge/Kconfig"
650 source "arch/arm/mach-gemini/Kconfig"
652 source "arch/arm/mach-integrator/Kconfig"
654 source "arch/arm/mach-iop32x/Kconfig"
656 source "arch/arm/mach-iop33x/Kconfig"
658 source "arch/arm/mach-iop13xx/Kconfig"
660 source "arch/arm/mach-ixp4xx/Kconfig"
662 source "arch/arm/mach-ixp2000/Kconfig"
664 source "arch/arm/mach-ixp23xx/Kconfig"
666 source "arch/arm/mach-loki/Kconfig"
668 source "arch/arm/mach-mv78xx0/Kconfig"
670 source "arch/arm/mach-pxa/Kconfig"
671 source "arch/arm/plat-pxa/Kconfig"
673 source "arch/arm/mach-mmp/Kconfig"
675 source "arch/arm/mach-sa1100/Kconfig"
677 source "arch/arm/plat-omap/Kconfig"
679 source "arch/arm/mach-omap1/Kconfig"
681 source "arch/arm/mach-omap2/Kconfig"
683 source "arch/arm/mach-orion5x/Kconfig"
685 source "arch/arm/mach-kirkwood/Kconfig"
687 source "arch/arm/plat-s3c24xx/Kconfig"
688 source "arch/arm/plat-s3c64xx/Kconfig"
689 source "arch/arm/plat-s3c/Kconfig"
692 source "arch/arm/mach-s3c2400/Kconfig"
693 source "arch/arm/mach-s3c2410/Kconfig"
694 source "arch/arm/mach-s3c2412/Kconfig"
695 source "arch/arm/mach-s3c2440/Kconfig"
696 source "arch/arm/mach-s3c2442/Kconfig"
697 source "arch/arm/mach-s3c2443/Kconfig"
701 source "arch/arm/mach-s3c6400/Kconfig"
702 source "arch/arm/mach-s3c6410/Kconfig"
705 source "arch/arm/plat-stmp3xxx/Kconfig"
707 source "arch/arm/mach-lh7a40x/Kconfig"
709 source "arch/arm/mach-h720x/Kconfig"
711 source "arch/arm/mach-versatile/Kconfig"
713 source "arch/arm/mach-aaec2000/Kconfig"
715 source "arch/arm/mach-realview/Kconfig"
717 source "arch/arm/mach-at91/Kconfig"
719 source "arch/arm/plat-mxc/Kconfig"
721 source "arch/arm/mach-netx/Kconfig"
723 source "arch/arm/mach-ns9xxx/Kconfig"
725 source "arch/arm/mach-davinci/Kconfig"
727 source "arch/arm/mach-ks8695/Kconfig"
729 source "arch/arm/mach-msm/Kconfig"
731 source "arch/arm/mach-u300/Kconfig"
733 source "arch/arm/mach-w90x900/Kconfig"
735 # Definitions to make life easier
748 source arch/arm/mm/Kconfig
751 bool "Enable iWMMXt support"
752 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
753 default y if PXA27x || PXA3xx || ARCH_MMP
755 Enable support for iWMMXt context switching at run time if
756 running on a CPU that supports it.
758 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
761 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
765 source "arch/arm/Kconfig-nommu"
768 config ARM_ERRATA_411920
769 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
770 depends on CPU_V6 && !SMP
772 Invalidation of the Instruction Cache operation can
773 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
774 It does not affect the MPCore. This option enables the ARM Ltd.
775 recommended workaround.
777 config ARM_ERRATA_430973
778 bool "ARM errata: Stale prediction on replaced interworking branch"
781 This option enables the workaround for the 430973 Cortex-A8
782 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
783 interworking branch is replaced with another code sequence at the
784 same virtual address, whether due to self-modifying code or virtual
785 to physical address re-mapping, Cortex-A8 does not recover from the
786 stale interworking branch prediction. This results in Cortex-A8
787 executing the new code sequence in the incorrect ARM or Thumb state.
788 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
789 and also flushes the branch target cache at every context switch.
790 Note that setting specific bits in the ACTLR register may not be
791 available in non-secure mode.
793 config ARM_ERRATA_458693
794 bool "ARM errata: Processor deadlock when a false hazard is created"
797 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
798 erratum. For very specific sequences of memory operations, it is
799 possible for a hazard condition intended for a cache line to instead
800 be incorrectly associated with a different cache line. This false
801 hazard might then cause a processor deadlock. The workaround enables
802 the L1 caching of the NEON accesses and disables the PLD instruction
803 in the ACTLR register. Note that setting specific bits in the ACTLR
804 register may not be available in non-secure mode.
806 config ARM_ERRATA_460075
807 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
810 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
811 erratum. Any asynchronous access to the L2 cache may encounter a
812 situation in which recent store transactions to the L2 cache are lost
813 and overwritten with stale memory contents from external memory. The
814 workaround disables the write-allocate mode for the L2 cache via the
815 ACTLR register. Note that setting specific bits in the ACTLR register
816 may not be available in non-secure mode.
820 source "arch/arm/common/Kconfig"
822 config FORCE_MAX_ZONEORDER
835 Find out whether you have ISA slots on your motherboard. ISA is the
836 name of a bus system, i.e. the way the CPU talks to the other stuff
837 inside your box. Other bus systems are PCI, EISA, MicroChannel
838 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
839 newer boards don't support it. If you have ISA, say Y, otherwise N.
841 # Select ISA DMA controller support
846 # Select ISA DMA interface
851 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
853 Find out whether you have a PCI motherboard. PCI is the name of a
854 bus system, i.e. the way the CPU talks to the other stuff inside
855 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
856 VESA. If you have PCI, say Y, otherwise N.
861 # Select the host bridge type
862 config PCI_HOST_VIA82C505
864 depends on PCI && ARCH_SHARK
867 config PCI_HOST_ITE8152
869 depends on PCI && MACH_ARMCORE
873 source "drivers/pci/Kconfig"
875 source "drivers/pcmcia/Kconfig"
879 menu "Kernel Features"
881 source "kernel/time/Kconfig"
884 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
885 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
886 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
887 depends on GENERIC_CLOCKEVENTS
888 select USE_GENERIC_SMP_HELPERS
889 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
891 This enables support for systems with more than one CPU. If you have
892 a system with only one CPU, like most personal computers, say N. If
893 you have a system with more than one CPU, say Y.
895 If you say N here, the kernel will run on single and multiprocessor
896 machines, but will use only one CPU of a multiprocessor machine. If
897 you say Y here, the kernel will run on many, but not all, single
898 processor machines. On a single processor machine, the kernel will
899 run faster if you say N here.
901 See also <file:Documentation/i386/IO-APIC.txt>,
902 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
903 <http://www.linuxdoc.org/docs.html#howto>.
905 If you don't know what to do here, say N.
911 This option enables support for the ARM system coherency unit
917 This options enables support for the ARM timer and watchdog unit
920 prompt "Memory split"
923 Select the desired split between kernel and user memory.
925 If you are not absolutely sure what you are doing, leave this
929 bool "3G/1G user/kernel split"
931 bool "2G/2G user/kernel split"
933 bool "1G/3G user/kernel split"
938 default 0x40000000 if VMSPLIT_1G
939 default 0x80000000 if VMSPLIT_2G
943 int "Maximum number of CPUs (2-32)"
949 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
950 depends on SMP && HOTPLUG && EXPERIMENTAL
952 Say Y here to experiment with turning CPUs off and on. CPUs
953 can be controlled through /sys/devices/system/cpu.
956 bool "Use local timer interrupts"
957 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
958 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
960 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
962 Enable support for local timers on SMP platforms, rather then the
963 legacy IPI broadcast method. Local timers allows the system
964 accounting to be spread across the timer interval, preventing a
965 "thundering herd" at every timer tick.
968 bool "Preemptible Kernel (EXPERIMENTAL)"
969 depends on EXPERIMENTAL
971 This option reduces the latency of the kernel when reacting to
972 real-time or interactive events by allowing a low priority process to
973 be preempted even if it is in kernel mode executing a system call.
974 This allows applications to run more reliably even when the system is
977 Say Y here if you are building a kernel for a desktop, embedded
978 or real-time system. Say N if you are unsure.
982 default 128 if ARCH_L7200
983 default 200 if ARCH_EBSA110 || ARCH_S3C2410
984 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
985 default AT91_TIMER_HZ if ARCH_AT91
989 bool "Use the ARM EABI to compile the kernel"
991 This option allows for the kernel to be compiled using the latest
992 ARM ABI (aka EABI). This is only useful if you are using a user
993 space environment that is also compiled with EABI.
995 Since there are major incompatibilities between the legacy ABI and
996 EABI, especially with regard to structure member alignment, this
997 option also changes the kernel syscall calling convention to
998 disambiguate both ABIs and allow for backward compatibility support
999 (selected with CONFIG_OABI_COMPAT).
1001 To use this you need GCC version 4.0.0 or later.
1004 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1005 depends on AEABI && EXPERIMENTAL
1008 This option preserves the old syscall interface along with the
1009 new (ARM EABI) one. It also provides a compatibility layer to
1010 intercept syscalls that have structure arguments which layout
1011 in memory differs between the legacy ABI and the new ARM EABI
1012 (only for non "thumb" binaries). This option adds a tiny
1013 overhead to all syscalls and produces a slightly larger kernel.
1014 If you know you'll be using only pure EABI user space then you
1015 can say N here. If this option is not selected and you attempt
1016 to execute a legacy ABI binary then the result will be
1017 UNPREDICTABLE (in fact it can be predicted that it won't work
1018 at all). If in doubt say Y.
1020 config ARCH_HAS_HOLES_MEMORYMODEL
1023 # Discontigmem is deprecated
1024 config ARCH_DISCONTIGMEM_ENABLE
1027 config ARCH_SPARSEMEM_ENABLE
1030 config ARCH_SPARSEMEM_DEFAULT
1031 def_bool ARCH_SPARSEMEM_ENABLE
1033 config ARCH_SELECT_MEMORY_MODEL
1034 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1038 default "4" if ARCH_LH7A40X
1040 depends on NEED_MULTIPLE_NODES
1043 bool "High Memory Support (EXPERIMENTAL)"
1044 depends on MMU && EXPERIMENTAL
1046 The address space of ARM processors is only 4 Gigabytes large
1047 and it has to accommodate user address space, kernel address
1048 space as well as some memory mapped IO. That means that, if you
1049 have a large amount of physical memory and/or IO, not all of the
1050 memory can be "permanently mapped" by the kernel. The physical
1051 memory that is not permanently mapped is called "high memory".
1053 Depending on the selected kernel/user memory split, minimum
1054 vmalloc space and actual amount of RAM, you may not need this
1055 option which should result in a slightly faster kernel.
1062 bool "Timer and CPU usage LEDs"
1063 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1064 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1065 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1066 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1067 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1068 ARCH_AT91 || ARCH_DAVINCI || \
1069 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1071 If you say Y here, the LEDs on your machine will be used
1072 to provide useful information about your current system status.
1074 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1075 be able to select which LEDs are active using the options below. If
1076 you are compiling a kernel for the EBSA-110 or the LART however, the
1077 red LED will simply flash regularly to indicate that the system is
1078 still functional. It is safe to say Y here if you have a CATS
1079 system, but the driver will do nothing.
1082 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1083 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1084 || MACH_OMAP_PERSEUS2
1086 depends on !GENERIC_CLOCKEVENTS
1087 default y if ARCH_EBSA110
1089 If you say Y here, one of the system LEDs (the green one on the
1090 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1091 will flash regularly to indicate that the system is still
1092 operational. This is mainly useful to kernel hackers who are
1093 debugging unstable kernels.
1095 The LART uses the same LED for both Timer LED and CPU usage LED
1096 functions. You may choose to use both, but the Timer LED function
1097 will overrule the CPU usage LED.
1100 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1102 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1103 || MACH_OMAP_PERSEUS2
1106 If you say Y here, the red LED will be used to give a good real
1107 time indication of CPU usage, by lighting whenever the idle task
1108 is not currently executing.
1110 The LART uses the same LED for both Timer LED and CPU usage LED
1111 functions. You may choose to use both, but the Timer LED function
1112 will overrule the CPU usage LED.
1114 config ALIGNMENT_TRAP
1116 depends on CPU_CP15_MMU
1117 default y if !ARCH_EBSA110
1119 ARM processors cannot fetch/store information which is not
1120 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1121 address divisible by 4. On 32-bit ARM processors, these non-aligned
1122 fetch/store instructions will be emulated in software if you say
1123 here, which has a severe performance impact. This is necessary for
1124 correct operation of some network protocols. With an IP-only
1125 configuration it is safe to say N, otherwise say Y.
1127 config UACCESS_WITH_MEMCPY
1128 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1129 depends on MMU && EXPERIMENTAL
1130 default y if CPU_FEROCEON
1132 Implement faster copy_to_user and clear_user methods for CPU
1133 cores where a 8-word STM instruction give significantly higher
1134 memory write throughput than a sequence of individual 32bit stores.
1136 A possible side effect is a slight increase in scheduling latency
1137 between threads sharing the same address space if they invoke
1138 such copy operations with large buffers.
1140 However, if the CPU data cache is using a write-allocate mode,
1141 this option is unlikely to provide any performance gain.
1147 # Compressed boot loader in ROM. Yes, we really want to ask about
1148 # TEXT and BSS so we preserve their values in the config files.
1149 config ZBOOT_ROM_TEXT
1150 hex "Compressed ROM boot loader base address"
1153 The physical address at which the ROM-able zImage is to be
1154 placed in the target. Platforms which normally make use of
1155 ROM-able zImage formats normally set this to a suitable
1156 value in their defconfig file.
1158 If ZBOOT_ROM is not enabled, this has no effect.
1160 config ZBOOT_ROM_BSS
1161 hex "Compressed ROM boot loader BSS address"
1164 The base address of an area of read/write memory in the target
1165 for the ROM-able zImage which must be available while the
1166 decompressor is running. It must be large enough to hold the
1167 entire decompressed kernel plus an additional 128 KiB.
1168 Platforms which normally make use of ROM-able zImage formats
1169 normally set this to a suitable value in their defconfig file.
1171 If ZBOOT_ROM is not enabled, this has no effect.
1174 bool "Compressed boot loader in ROM/flash"
1175 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1177 Say Y here if you intend to execute your compressed kernel image
1178 (zImage) directly from ROM or flash. If unsure, say N.
1181 string "Default kernel command string"
1184 On some architectures (EBSA110 and CATS), there is currently no way
1185 for the boot loader to pass arguments to the kernel. For these
1186 architectures, you should supply some command-line options at build
1187 time by entering them here. As a minimum, you should specify the
1188 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1191 bool "Kernel Execute-In-Place from ROM"
1192 depends on !ZBOOT_ROM
1194 Execute-In-Place allows the kernel to run from non-volatile storage
1195 directly addressable by the CPU, such as NOR flash. This saves RAM
1196 space since the text section of the kernel is not loaded from flash
1197 to RAM. Read-write sections, such as the data section and stack,
1198 are still copied to RAM. The XIP kernel is not compressed since
1199 it has to run directly from flash, so it will take more space to
1200 store it. The flash address used to link the kernel object files,
1201 and for storing it, is configuration dependent. Therefore, if you
1202 say Y here, you must know the proper physical address where to
1203 store the kernel image depending on your own flash memory usage.
1205 Also note that the make target becomes "make xipImage" rather than
1206 "make zImage" or "make Image". The final kernel binary to put in
1207 ROM memory will be arch/arm/boot/xipImage.
1211 config XIP_PHYS_ADDR
1212 hex "XIP Kernel Physical Location"
1213 depends on XIP_KERNEL
1214 default "0x00080000"
1216 This is the physical address in your flash memory the kernel will
1217 be linked for and stored to. This address is dependent on your
1221 bool "Kexec system call (EXPERIMENTAL)"
1222 depends on EXPERIMENTAL
1224 kexec is a system call that implements the ability to shutdown your
1225 current kernel, and to start another kernel. It is like a reboot
1226 but it is independent of the system firmware. And like a reboot
1227 you can start any kernel with it, not just Linux.
1229 It is an ongoing process to be certain the hardware in a machine
1230 is properly shutdown, so do not be surprised if this code does not
1231 initially work for you. It may help to enable device hotplugging
1235 bool "Export atags in procfs"
1239 Should the atags used to boot the kernel be exported in an "atags"
1240 file in procfs. Useful with kexec.
1244 menu "CPU Power Management"
1246 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA || ARCH_S3C64XX)
1248 source "drivers/cpufreq/Kconfig"
1250 config CPU_FREQ_SA1100
1252 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1255 config CPU_FREQ_SA1110
1257 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1260 config CPU_FREQ_INTEGRATOR
1261 tristate "CPUfreq driver for ARM Integrator CPUs"
1262 depends on ARCH_INTEGRATOR && CPU_FREQ
1265 This enables the CPUfreq driver for ARM Integrator CPUs.
1267 For details, take a look at <file:Documentation/cpu-freq>.
1273 depends on CPU_FREQ && ARCH_PXA && PXA25x
1275 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1277 config CPU_FREQ_S3C64XX
1278 bool "CPUfreq support for Samsung S3C64XX CPUs"
1279 depends on CPU_FREQ && CPU_S3C6410
1283 source "drivers/cpuidle/Kconfig"
1287 menu "Floating point emulation"
1289 comment "At least one emulation must be selected"
1292 bool "NWFPE math emulation"
1293 depends on !AEABI || OABI_COMPAT
1295 Say Y to include the NWFPE floating point emulator in the kernel.
1296 This is necessary to run most binaries. Linux does not currently
1297 support floating point hardware so you need to say Y here even if
1298 your machine has an FPA or floating point co-processor podule.
1300 You may say N here if you are going to load the Acorn FPEmulator
1301 early in the bootup.
1304 bool "Support extended precision"
1305 depends on FPE_NWFPE
1307 Say Y to include 80-bit support in the kernel floating-point
1308 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1309 Note that gcc does not generate 80-bit operations by default,
1310 so in most cases this option only enlarges the size of the
1311 floating point emulator without any good reason.
1313 You almost surely want to say N here.
1316 bool "FastFPE math emulation (EXPERIMENTAL)"
1317 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1319 Say Y here to include the FAST floating point emulator in the kernel.
1320 This is an experimental much faster emulator which now also has full
1321 precision for the mantissa. It does not support any exceptions.
1322 It is very simple, and approximately 3-6 times faster than NWFPE.
1324 It should be sufficient for most programs. It may be not suitable
1325 for scientific calculations, but you have to check this for yourself.
1326 If you do not feel you need a faster FP emulation you should better
1330 bool "VFP-format floating point maths"
1331 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1333 Say Y to include VFP support code in the kernel. This is needed
1334 if your hardware includes a VFP unit.
1336 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1337 release notes and additional status information.
1339 Say N if your target does not have VFP hardware.
1347 bool "Advanced SIMD (NEON) Extension support"
1348 depends on VFPv3 && CPU_V7
1350 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1355 menu "Userspace binary formats"
1357 source "fs/Kconfig.binfmt"
1360 tristate "RISC OS personality"
1363 Say Y here to include the kernel code necessary if you want to run
1364 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1365 experimental; if this sounds frightening, say N and sleep in peace.
1366 You can also say M here to compile this support as a module (which
1367 will be called arthur).
1371 menu "Power management options"
1373 source "kernel/power/Kconfig"
1375 config ARCH_SUSPEND_POSSIBLE
1380 source "net/Kconfig"
1382 menu "Device Drivers"
1384 source "drivers/base/Kconfig"
1386 source "drivers/connector/Kconfig"
1388 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1389 source "drivers/mtd/Kconfig"
1392 source "drivers/parport/Kconfig"
1394 source "drivers/pnp/Kconfig"
1396 source "drivers/block/Kconfig"
1398 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1400 source "drivers/misc/Kconfig"
1402 source "drivers/ide/Kconfig"
1404 source "drivers/scsi/Kconfig"
1406 source "drivers/ata/Kconfig"
1408 source "drivers/md/Kconfig"
1410 source "drivers/message/fusion/Kconfig"
1412 source "drivers/ieee1394/Kconfig"
1414 source "drivers/message/i2o/Kconfig"
1416 source "drivers/net/Kconfig"
1418 source "drivers/isdn/Kconfig"
1420 # input before char - char/joystick depends on it. As does USB.
1422 source "drivers/input/Kconfig"
1424 source "drivers/char/Kconfig"
1426 source "drivers/i2c/Kconfig"
1428 source "drivers/spi/Kconfig"
1430 source "drivers/gpio/Kconfig"
1432 source "drivers/w1/Kconfig"
1434 source "drivers/power/Kconfig"
1436 source "drivers/hwmon/Kconfig"
1438 source "drivers/thermal/Kconfig"
1440 source "drivers/watchdog/Kconfig"
1442 source "drivers/ssb/Kconfig"
1444 #source "drivers/l3/Kconfig"
1446 source "drivers/mfd/Kconfig"
1448 source "drivers/media/Kconfig"
1450 source "drivers/video/Kconfig"
1452 source "sound/Kconfig"
1454 source "drivers/hid/Kconfig"
1456 source "drivers/usb/Kconfig"
1458 source "drivers/uwb/Kconfig"
1460 source "drivers/mmc/Kconfig"
1462 source "drivers/memstick/Kconfig"
1464 source "drivers/accessibility/Kconfig"
1466 source "drivers/leds/Kconfig"
1468 source "drivers/rtc/Kconfig"
1470 source "drivers/dma/Kconfig"
1472 source "drivers/dca/Kconfig"
1474 source "drivers/auxdisplay/Kconfig"
1476 source "drivers/regulator/Kconfig"
1478 source "drivers/uio/Kconfig"
1480 source "drivers/staging/Kconfig"
1486 source "arch/arm/Kconfig.debug"
1488 source "security/Kconfig"
1490 source "crypto/Kconfig"
1492 source "lib/Kconfig"