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
499 select GENERIC_CLOCKEVENTS
501 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
502 can login www.mcuos.com or www.nuvoton.com to know more.
505 bool "Philips Nexperia PNX4008 Mobile"
509 This enables support for Philips PNX4008 mobile platform.
512 bool "PXA2xx/PXA3xx-based"
518 select ARCH_REQUIRE_GPIOLIB
520 select GENERIC_CLOCKEVENTS
524 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
530 select GENERIC_CLOCKEVENTS
532 Support for Qualcomm MSM7K based systems. This runs on the ARM11
533 apps processor of the MSM7K and depends on a shared memory
534 interface to the ARM9 modem processor which runs the baseband stack
535 and controls some vital subsystems (clock and power control, etc).
542 select ARCH_MAY_HAVE_PC_FDC
543 select HAVE_PATA_PLATFORM
546 select ARCH_SPARSEMEM_ENABLE
548 On the Acorn Risc-PC, Linux can support the internal IDE disk and
549 CD-ROM interface, serial and parallel port, and the floppy drive.
555 select ARCH_SPARSEMEM_ENABLE
559 select GENERIC_CLOCKEVENTS
562 select ARCH_REQUIRE_GPIOLIB
564 Support for StrongARM 11x0 based boards.
567 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
571 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
572 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
573 the Samsung SMDK2410 development board (and derivatives).
576 bool "Samsung S3C64XX"
580 Samsung S3C64XX series based systems
590 Support for the StrongARM based Digital DNARD machine, also known
591 as "Shark" (<http://www.shark-linux.de/shark.html>).
596 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
597 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
599 Say Y here for systems based on one of the Sharp LH7A40X
600 System on a Chip processors. These CPUs include an ARM922T
601 core with a wide array of integrated devices for
602 hand-held and low-power applications.
605 bool "ST-Ericsson U300 Series"
611 select GENERIC_CLOCKEVENTS
616 Support for ST-Ericsson U300 series mobile platforms.
622 select GENERIC_CLOCKEVENTS
624 select ARCH_REQUIRE_GPIOLIB
629 select GENERIC_ALLOCATOR
631 Support for TI's DaVinci platform.
637 select ARCH_REQUIRE_GPIOLIB
639 select GENERIC_CLOCKEVENTS
641 Support for TI's OMAP platform (OMAP1 and OMAP2).
645 source "arch/arm/mach-clps711x/Kconfig"
647 source "arch/arm/mach-ep93xx/Kconfig"
649 source "arch/arm/mach-footbridge/Kconfig"
651 source "arch/arm/mach-gemini/Kconfig"
653 source "arch/arm/mach-integrator/Kconfig"
655 source "arch/arm/mach-iop32x/Kconfig"
657 source "arch/arm/mach-iop33x/Kconfig"
659 source "arch/arm/mach-iop13xx/Kconfig"
661 source "arch/arm/mach-ixp4xx/Kconfig"
663 source "arch/arm/mach-ixp2000/Kconfig"
665 source "arch/arm/mach-ixp23xx/Kconfig"
667 source "arch/arm/mach-loki/Kconfig"
669 source "arch/arm/mach-mv78xx0/Kconfig"
671 source "arch/arm/mach-pxa/Kconfig"
672 source "arch/arm/plat-pxa/Kconfig"
674 source "arch/arm/mach-mmp/Kconfig"
676 source "arch/arm/mach-sa1100/Kconfig"
678 source "arch/arm/plat-omap/Kconfig"
680 source "arch/arm/mach-omap1/Kconfig"
682 source "arch/arm/mach-omap2/Kconfig"
684 source "arch/arm/mach-orion5x/Kconfig"
686 source "arch/arm/mach-kirkwood/Kconfig"
688 source "arch/arm/plat-s3c24xx/Kconfig"
689 source "arch/arm/plat-s3c64xx/Kconfig"
690 source "arch/arm/plat-s3c/Kconfig"
693 source "arch/arm/mach-s3c2400/Kconfig"
694 source "arch/arm/mach-s3c2410/Kconfig"
695 source "arch/arm/mach-s3c2412/Kconfig"
696 source "arch/arm/mach-s3c2440/Kconfig"
697 source "arch/arm/mach-s3c2442/Kconfig"
698 source "arch/arm/mach-s3c2443/Kconfig"
702 source "arch/arm/mach-s3c6400/Kconfig"
703 source "arch/arm/mach-s3c6410/Kconfig"
706 source "arch/arm/plat-stmp3xxx/Kconfig"
708 source "arch/arm/mach-lh7a40x/Kconfig"
710 source "arch/arm/mach-h720x/Kconfig"
712 source "arch/arm/mach-versatile/Kconfig"
714 source "arch/arm/mach-aaec2000/Kconfig"
716 source "arch/arm/mach-realview/Kconfig"
718 source "arch/arm/mach-at91/Kconfig"
720 source "arch/arm/plat-mxc/Kconfig"
722 source "arch/arm/mach-netx/Kconfig"
724 source "arch/arm/mach-ns9xxx/Kconfig"
726 source "arch/arm/mach-davinci/Kconfig"
728 source "arch/arm/mach-ks8695/Kconfig"
730 source "arch/arm/mach-msm/Kconfig"
732 source "arch/arm/mach-u300/Kconfig"
734 source "arch/arm/mach-w90x900/Kconfig"
736 # Definitions to make life easier
749 source arch/arm/mm/Kconfig
752 bool "Enable iWMMXt support"
753 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
754 default y if PXA27x || PXA3xx || ARCH_MMP
756 Enable support for iWMMXt context switching at run time if
757 running on a CPU that supports it.
759 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
762 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
766 source "arch/arm/Kconfig-nommu"
769 config ARM_ERRATA_411920
770 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
771 depends on CPU_V6 && !SMP
773 Invalidation of the Instruction Cache operation can
774 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
775 It does not affect the MPCore. This option enables the ARM Ltd.
776 recommended workaround.
778 config ARM_ERRATA_430973
779 bool "ARM errata: Stale prediction on replaced interworking branch"
782 This option enables the workaround for the 430973 Cortex-A8
783 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
784 interworking branch is replaced with another code sequence at the
785 same virtual address, whether due to self-modifying code or virtual
786 to physical address re-mapping, Cortex-A8 does not recover from the
787 stale interworking branch prediction. This results in Cortex-A8
788 executing the new code sequence in the incorrect ARM or Thumb state.
789 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
790 and also flushes the branch target cache at every context switch.
791 Note that setting specific bits in the ACTLR register may not be
792 available in non-secure mode.
794 config ARM_ERRATA_458693
795 bool "ARM errata: Processor deadlock when a false hazard is created"
798 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
799 erratum. For very specific sequences of memory operations, it is
800 possible for a hazard condition intended for a cache line to instead
801 be incorrectly associated with a different cache line. This false
802 hazard might then cause a processor deadlock. The workaround enables
803 the L1 caching of the NEON accesses and disables the PLD instruction
804 in the ACTLR register. Note that setting specific bits in the ACTLR
805 register may not be available in non-secure mode.
807 config ARM_ERRATA_460075
808 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
811 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
812 erratum. Any asynchronous access to the L2 cache may encounter a
813 situation in which recent store transactions to the L2 cache are lost
814 and overwritten with stale memory contents from external memory. The
815 workaround disables the write-allocate mode for the L2 cache via the
816 ACTLR register. Note that setting specific bits in the ACTLR register
817 may not be available in non-secure mode.
821 source "arch/arm/common/Kconfig"
823 config FORCE_MAX_ZONEORDER
836 Find out whether you have ISA slots on your motherboard. ISA is the
837 name of a bus system, i.e. the way the CPU talks to the other stuff
838 inside your box. Other bus systems are PCI, EISA, MicroChannel
839 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
840 newer boards don't support it. If you have ISA, say Y, otherwise N.
842 # Select ISA DMA controller support
847 # Select ISA DMA interface
852 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
854 Find out whether you have a PCI motherboard. PCI is the name of a
855 bus system, i.e. the way the CPU talks to the other stuff inside
856 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
857 VESA. If you have PCI, say Y, otherwise N.
862 # Select the host bridge type
863 config PCI_HOST_VIA82C505
865 depends on PCI && ARCH_SHARK
868 config PCI_HOST_ITE8152
870 depends on PCI && MACH_ARMCORE
874 source "drivers/pci/Kconfig"
876 source "drivers/pcmcia/Kconfig"
880 menu "Kernel Features"
882 source "kernel/time/Kconfig"
885 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
886 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
887 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
888 depends on GENERIC_CLOCKEVENTS
889 select USE_GENERIC_SMP_HELPERS
890 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
892 This enables support for systems with more than one CPU. If you have
893 a system with only one CPU, like most personal computers, say N. If
894 you have a system with more than one CPU, say Y.
896 If you say N here, the kernel will run on single and multiprocessor
897 machines, but will use only one CPU of a multiprocessor machine. If
898 you say Y here, the kernel will run on many, but not all, single
899 processor machines. On a single processor machine, the kernel will
900 run faster if you say N here.
902 See also <file:Documentation/i386/IO-APIC.txt>,
903 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
904 <http://www.linuxdoc.org/docs.html#howto>.
906 If you don't know what to do here, say N.
912 This option enables support for the ARM system coherency unit
918 This options enables support for the ARM timer and watchdog unit
921 prompt "Memory split"
924 Select the desired split between kernel and user memory.
926 If you are not absolutely sure what you are doing, leave this
930 bool "3G/1G user/kernel split"
932 bool "2G/2G user/kernel split"
934 bool "1G/3G user/kernel split"
939 default 0x40000000 if VMSPLIT_1G
940 default 0x80000000 if VMSPLIT_2G
944 int "Maximum number of CPUs (2-32)"
950 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
951 depends on SMP && HOTPLUG && EXPERIMENTAL
953 Say Y here to experiment with turning CPUs off and on. CPUs
954 can be controlled through /sys/devices/system/cpu.
957 bool "Use local timer interrupts"
958 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
959 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4)
961 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
963 Enable support for local timers on SMP platforms, rather then the
964 legacy IPI broadcast method. Local timers allows the system
965 accounting to be spread across the timer interval, preventing a
966 "thundering herd" at every timer tick.
969 bool "Preemptible Kernel (EXPERIMENTAL)"
970 depends on EXPERIMENTAL
972 This option reduces the latency of the kernel when reacting to
973 real-time or interactive events by allowing a low priority process to
974 be preempted even if it is in kernel mode executing a system call.
975 This allows applications to run more reliably even when the system is
978 Say Y here if you are building a kernel for a desktop, embedded
979 or real-time system. Say N if you are unsure.
983 default 128 if ARCH_L7200
984 default 200 if ARCH_EBSA110 || ARCH_S3C2410
985 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
986 default AT91_TIMER_HZ if ARCH_AT91
990 bool "Use the ARM EABI to compile the kernel"
992 This option allows for the kernel to be compiled using the latest
993 ARM ABI (aka EABI). This is only useful if you are using a user
994 space environment that is also compiled with EABI.
996 Since there are major incompatibilities between the legacy ABI and
997 EABI, especially with regard to structure member alignment, this
998 option also changes the kernel syscall calling convention to
999 disambiguate both ABIs and allow for backward compatibility support
1000 (selected with CONFIG_OABI_COMPAT).
1002 To use this you need GCC version 4.0.0 or later.
1005 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1006 depends on AEABI && EXPERIMENTAL
1009 This option preserves the old syscall interface along with the
1010 new (ARM EABI) one. It also provides a compatibility layer to
1011 intercept syscalls that have structure arguments which layout
1012 in memory differs between the legacy ABI and the new ARM EABI
1013 (only for non "thumb" binaries). This option adds a tiny
1014 overhead to all syscalls and produces a slightly larger kernel.
1015 If you know you'll be using only pure EABI user space then you
1016 can say N here. If this option is not selected and you attempt
1017 to execute a legacy ABI binary then the result will be
1018 UNPREDICTABLE (in fact it can be predicted that it won't work
1019 at all). If in doubt say Y.
1021 config ARCH_HAS_HOLES_MEMORYMODEL
1024 # Discontigmem is deprecated
1025 config ARCH_DISCONTIGMEM_ENABLE
1028 config ARCH_SPARSEMEM_ENABLE
1031 config ARCH_SPARSEMEM_DEFAULT
1032 def_bool ARCH_SPARSEMEM_ENABLE
1034 config ARCH_SELECT_MEMORY_MODEL
1035 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1039 default "4" if ARCH_LH7A40X
1041 depends on NEED_MULTIPLE_NODES
1044 bool "High Memory Support (EXPERIMENTAL)"
1045 depends on MMU && EXPERIMENTAL
1047 The address space of ARM processors is only 4 Gigabytes large
1048 and it has to accommodate user address space, kernel address
1049 space as well as some memory mapped IO. That means that, if you
1050 have a large amount of physical memory and/or IO, not all of the
1051 memory can be "permanently mapped" by the kernel. The physical
1052 memory that is not permanently mapped is called "high memory".
1054 Depending on the selected kernel/user memory split, minimum
1055 vmalloc space and actual amount of RAM, you may not need this
1056 option which should result in a slightly faster kernel.
1063 bool "Timer and CPU usage LEDs"
1064 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1065 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1066 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1067 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1068 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1069 ARCH_AT91 || ARCH_DAVINCI || \
1070 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1072 If you say Y here, the LEDs on your machine will be used
1073 to provide useful information about your current system status.
1075 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1076 be able to select which LEDs are active using the options below. If
1077 you are compiling a kernel for the EBSA-110 or the LART however, the
1078 red LED will simply flash regularly to indicate that the system is
1079 still functional. It is safe to say Y here if you have a CATS
1080 system, but the driver will do nothing.
1083 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1084 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1085 || MACH_OMAP_PERSEUS2
1087 depends on !GENERIC_CLOCKEVENTS
1088 default y if ARCH_EBSA110
1090 If you say Y here, one of the system LEDs (the green one on the
1091 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1092 will flash regularly to indicate that the system is still
1093 operational. This is mainly useful to kernel hackers who are
1094 debugging unstable kernels.
1096 The LART uses the same LED for both Timer LED and CPU usage LED
1097 functions. You may choose to use both, but the Timer LED function
1098 will overrule the CPU usage LED.
1101 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1103 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1104 || MACH_OMAP_PERSEUS2
1107 If you say Y here, the red LED will be used to give a good real
1108 time indication of CPU usage, by lighting whenever the idle task
1109 is not currently executing.
1111 The LART uses the same LED for both Timer LED and CPU usage LED
1112 functions. You may choose to use both, but the Timer LED function
1113 will overrule the CPU usage LED.
1115 config ALIGNMENT_TRAP
1117 depends on CPU_CP15_MMU
1118 default y if !ARCH_EBSA110
1120 ARM processors cannot fetch/store information which is not
1121 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1122 address divisible by 4. On 32-bit ARM processors, these non-aligned
1123 fetch/store instructions will be emulated in software if you say
1124 here, which has a severe performance impact. This is necessary for
1125 correct operation of some network protocols. With an IP-only
1126 configuration it is safe to say N, otherwise say Y.
1128 config UACCESS_WITH_MEMCPY
1129 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1130 depends on MMU && EXPERIMENTAL
1131 default y if CPU_FEROCEON
1133 Implement faster copy_to_user and clear_user methods for CPU
1134 cores where a 8-word STM instruction give significantly higher
1135 memory write throughput than a sequence of individual 32bit stores.
1137 A possible side effect is a slight increase in scheduling latency
1138 between threads sharing the same address space if they invoke
1139 such copy operations with large buffers.
1141 However, if the CPU data cache is using a write-allocate mode,
1142 this option is unlikely to provide any performance gain.
1148 # Compressed boot loader in ROM. Yes, we really want to ask about
1149 # TEXT and BSS so we preserve their values in the config files.
1150 config ZBOOT_ROM_TEXT
1151 hex "Compressed ROM boot loader base address"
1154 The physical address at which the ROM-able zImage is to be
1155 placed in the target. Platforms which normally make use of
1156 ROM-able zImage formats normally set this to a suitable
1157 value in their defconfig file.
1159 If ZBOOT_ROM is not enabled, this has no effect.
1161 config ZBOOT_ROM_BSS
1162 hex "Compressed ROM boot loader BSS address"
1165 The base address of an area of read/write memory in the target
1166 for the ROM-able zImage which must be available while the
1167 decompressor is running. It must be large enough to hold the
1168 entire decompressed kernel plus an additional 128 KiB.
1169 Platforms which normally make use of ROM-able zImage formats
1170 normally set this to a suitable value in their defconfig file.
1172 If ZBOOT_ROM is not enabled, this has no effect.
1175 bool "Compressed boot loader in ROM/flash"
1176 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1178 Say Y here if you intend to execute your compressed kernel image
1179 (zImage) directly from ROM or flash. If unsure, say N.
1182 string "Default kernel command string"
1185 On some architectures (EBSA110 and CATS), there is currently no way
1186 for the boot loader to pass arguments to the kernel. For these
1187 architectures, you should supply some command-line options at build
1188 time by entering them here. As a minimum, you should specify the
1189 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1192 bool "Kernel Execute-In-Place from ROM"
1193 depends on !ZBOOT_ROM
1195 Execute-In-Place allows the kernel to run from non-volatile storage
1196 directly addressable by the CPU, such as NOR flash. This saves RAM
1197 space since the text section of the kernel is not loaded from flash
1198 to RAM. Read-write sections, such as the data section and stack,
1199 are still copied to RAM. The XIP kernel is not compressed since
1200 it has to run directly from flash, so it will take more space to
1201 store it. The flash address used to link the kernel object files,
1202 and for storing it, is configuration dependent. Therefore, if you
1203 say Y here, you must know the proper physical address where to
1204 store the kernel image depending on your own flash memory usage.
1206 Also note that the make target becomes "make xipImage" rather than
1207 "make zImage" or "make Image". The final kernel binary to put in
1208 ROM memory will be arch/arm/boot/xipImage.
1212 config XIP_PHYS_ADDR
1213 hex "XIP Kernel Physical Location"
1214 depends on XIP_KERNEL
1215 default "0x00080000"
1217 This is the physical address in your flash memory the kernel will
1218 be linked for and stored to. This address is dependent on your
1222 bool "Kexec system call (EXPERIMENTAL)"
1223 depends on EXPERIMENTAL
1225 kexec is a system call that implements the ability to shutdown your
1226 current kernel, and to start another kernel. It is like a reboot
1227 but it is independent of the system firmware. And like a reboot
1228 you can start any kernel with it, not just Linux.
1230 It is an ongoing process to be certain the hardware in a machine
1231 is properly shutdown, so do not be surprised if this code does not
1232 initially work for you. It may help to enable device hotplugging
1236 bool "Export atags in procfs"
1240 Should the atags used to boot the kernel be exported in an "atags"
1241 file in procfs. Useful with kexec.
1245 menu "CPU Power Management"
1247 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA || ARCH_S3C64XX)
1249 source "drivers/cpufreq/Kconfig"
1251 config CPU_FREQ_SA1100
1253 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1256 config CPU_FREQ_SA1110
1258 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1261 config CPU_FREQ_INTEGRATOR
1262 tristate "CPUfreq driver for ARM Integrator CPUs"
1263 depends on ARCH_INTEGRATOR && CPU_FREQ
1266 This enables the CPUfreq driver for ARM Integrator CPUs.
1268 For details, take a look at <file:Documentation/cpu-freq>.
1274 depends on CPU_FREQ && ARCH_PXA && PXA25x
1276 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1278 config CPU_FREQ_S3C64XX
1279 bool "CPUfreq support for Samsung S3C64XX CPUs"
1280 depends on CPU_FREQ && CPU_S3C6410
1284 source "drivers/cpuidle/Kconfig"
1288 menu "Floating point emulation"
1290 comment "At least one emulation must be selected"
1293 bool "NWFPE math emulation"
1294 depends on !AEABI || OABI_COMPAT
1296 Say Y to include the NWFPE floating point emulator in the kernel.
1297 This is necessary to run most binaries. Linux does not currently
1298 support floating point hardware so you need to say Y here even if
1299 your machine has an FPA or floating point co-processor podule.
1301 You may say N here if you are going to load the Acorn FPEmulator
1302 early in the bootup.
1305 bool "Support extended precision"
1306 depends on FPE_NWFPE
1308 Say Y to include 80-bit support in the kernel floating-point
1309 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1310 Note that gcc does not generate 80-bit operations by default,
1311 so in most cases this option only enlarges the size of the
1312 floating point emulator without any good reason.
1314 You almost surely want to say N here.
1317 bool "FastFPE math emulation (EXPERIMENTAL)"
1318 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1320 Say Y here to include the FAST floating point emulator in the kernel.
1321 This is an experimental much faster emulator which now also has full
1322 precision for the mantissa. It does not support any exceptions.
1323 It is very simple, and approximately 3-6 times faster than NWFPE.
1325 It should be sufficient for most programs. It may be not suitable
1326 for scientific calculations, but you have to check this for yourself.
1327 If you do not feel you need a faster FP emulation you should better
1331 bool "VFP-format floating point maths"
1332 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1334 Say Y to include VFP support code in the kernel. This is needed
1335 if your hardware includes a VFP unit.
1337 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1338 release notes and additional status information.
1340 Say N if your target does not have VFP hardware.
1348 bool "Advanced SIMD (NEON) Extension support"
1349 depends on VFPv3 && CPU_V7
1351 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1356 menu "Userspace binary formats"
1358 source "fs/Kconfig.binfmt"
1361 tristate "RISC OS personality"
1364 Say Y here to include the kernel code necessary if you want to run
1365 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1366 experimental; if this sounds frightening, say N and sleep in peace.
1367 You can also say M here to compile this support as a module (which
1368 will be called arthur).
1372 menu "Power management options"
1374 source "kernel/power/Kconfig"
1376 config ARCH_SUSPEND_POSSIBLE
1381 source "net/Kconfig"
1383 menu "Device Drivers"
1385 source "drivers/base/Kconfig"
1387 source "drivers/connector/Kconfig"
1389 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1390 source "drivers/mtd/Kconfig"
1393 source "drivers/parport/Kconfig"
1395 source "drivers/pnp/Kconfig"
1397 source "drivers/block/Kconfig"
1399 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1401 source "drivers/misc/Kconfig"
1403 source "drivers/ide/Kconfig"
1405 source "drivers/scsi/Kconfig"
1407 source "drivers/ata/Kconfig"
1409 source "drivers/md/Kconfig"
1411 source "drivers/message/fusion/Kconfig"
1413 source "drivers/ieee1394/Kconfig"
1415 source "drivers/message/i2o/Kconfig"
1417 source "drivers/net/Kconfig"
1419 source "drivers/isdn/Kconfig"
1421 # input before char - char/joystick depends on it. As does USB.
1423 source "drivers/input/Kconfig"
1425 source "drivers/char/Kconfig"
1427 source "drivers/i2c/Kconfig"
1429 source "drivers/spi/Kconfig"
1431 source "drivers/gpio/Kconfig"
1433 source "drivers/w1/Kconfig"
1435 source "drivers/power/Kconfig"
1437 source "drivers/hwmon/Kconfig"
1439 source "drivers/thermal/Kconfig"
1441 source "drivers/watchdog/Kconfig"
1443 source "drivers/ssb/Kconfig"
1445 #source "drivers/l3/Kconfig"
1447 source "drivers/mfd/Kconfig"
1449 source "drivers/media/Kconfig"
1451 source "drivers/video/Kconfig"
1453 source "sound/Kconfig"
1455 source "drivers/hid/Kconfig"
1457 source "drivers/usb/Kconfig"
1459 source "drivers/uwb/Kconfig"
1461 source "drivers/mmc/Kconfig"
1463 source "drivers/memstick/Kconfig"
1465 source "drivers/accessibility/Kconfig"
1467 source "drivers/leds/Kconfig"
1469 source "drivers/rtc/Kconfig"
1471 source "drivers/dma/Kconfig"
1473 source "drivers/dca/Kconfig"
1475 source "drivers/auxdisplay/Kconfig"
1477 source "drivers/regulator/Kconfig"
1479 source "drivers/uio/Kconfig"
1481 source "drivers/staging/Kconfig"
1487 source "arch/arm/Kconfig.debug"
1489 source "security/Kconfig"
1491 source "crypto/Kconfig"
1493 source "lib/Kconfig"