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
43 config GENERIC_CLOCKEVENTS
47 config GENERIC_CLOCKEVENTS_BROADCAST
49 depends on GENERIC_CLOCKEVENTS
50 default y if SMP && !LOCAL_TIMERS
63 The Extended Industry Standard Architecture (EISA) bus was
64 developed as an open alternative to the IBM MicroChannel bus.
66 The EISA bus provided some of the features of the IBM MicroChannel
67 bus while maintaining backward compatibility with cards made for
68 the older ISA bus. The EISA bus saw limited use between 1988 and
69 1995 when it was made obsolete by the PCI bus.
71 Say Y here if you are building a kernel for an EISA-based machine.
81 MicroChannel Architecture is found in some IBM PS/2 machines and
82 laptops. It is a bus system similar to PCI or ISA. See
83 <file:Documentation/mca.txt> (and especially the web page given
84 there) before attempting to build an MCA bus kernel.
86 config GENERIC_HARDIRQS
90 config STACKTRACE_SUPPORT
94 config HAVE_LATENCYTOP_SUPPORT
99 config LOCKDEP_SUPPORT
103 config TRACE_IRQFLAGS_SUPPORT
107 config HARDIRQS_SW_RESEND
111 config GENERIC_IRQ_PROBE
115 config GENERIC_LOCKBREAK
118 depends on SMP && PREEMPT
120 config RWSEM_GENERIC_SPINLOCK
124 config RWSEM_XCHGADD_ALGORITHM
127 config ARCH_HAS_ILOG2_U32
131 config ARCH_HAS_ILOG2_U64
135 config GENERIC_HWEIGHT
139 config GENERIC_CALIBRATE_DELAY
143 config ARCH_MAY_HAVE_PC_FDC
149 config GENERIC_ISA_DMA
158 config GENERIC_HARDIRQS_NO__DO_IRQ
163 config OPROFILE_ARMV6
165 depends on CPU_V6 && !SMP
166 select OPROFILE_ARM11_CORE
168 config OPROFILE_MPCORE
170 depends on CPU_V6 && SMP
171 select OPROFILE_ARM11_CORE
173 config OPROFILE_ARM11_CORE
176 config OPROFILE_ARMV7
178 depends on CPU_V7 && !SMP
185 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
186 default DRAM_BASE if REMAP_VECTORS_TO_RAM
189 The base address of exception vectors.
191 source "init/Kconfig"
193 source "kernel/Kconfig.freezer"
198 prompt "ARM system type"
199 default ARCH_VERSATILE
202 bool "Agilent AAEC-2000 based"
207 This enables support for systems based on the Agilent AAEC-2000
209 config ARCH_INTEGRATOR
210 bool "ARM Ltd. Integrator family"
216 Support for ARM's Integrator platform.
219 bool "ARM Ltd. RealView family"
225 select GENERIC_CLOCKEVENTS
227 This enables support for ARM Ltd RealView boards.
229 config ARCH_VERSATILE
230 bool "ARM Ltd. Versatile family"
237 select GENERIC_CLOCKEVENTS
239 This enables support for ARM Ltd Versatile board.
244 select ARCH_REQUIRE_GPIOLIB
247 This enables support for systems based on the Atmel AT91RM9200,
248 AT91SAM9 and AT91CAP9 processors.
251 bool "Cirrus Logic CLPS711x/EP721x-based"
254 Support for Cirrus Logic 711x/721x based boards.
257 bool "Cortina Systems Gemini"
260 select ARCH_REQUIRE_GPIOLIB
262 Support for the Cortina Systems Gemini family SoCs
270 This is an evaluation board for the StrongARM processor available
271 from Digital. It has limited hardware on-board, including an
272 Ethernet interface, two PCMCIA sockets, two serial ports and a
283 select ARCH_REQUIRE_GPIOLIB
284 select ARCH_HAS_HOLES_MEMORYMODEL
286 This enables support for the Cirrus EP93xx series of CPUs.
288 config ARCH_FOOTBRIDGE
293 Support for systems based on the DC21285 companion chip
294 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
297 bool "Freescale MXC/iMX-based"
299 select GENERIC_CLOCKEVENTS
302 select ARCH_REQUIRE_GPIOLIB
305 Support for Freescale MXC/iMX-based family of processors
308 bool "Hilscher NetX based"
311 select GENERIC_CLOCKEVENTS
314 This enables support for systems based on the Hilscher NetX Soc
317 bool "Hynix HMS720x-based"
321 This enables support for systems based on the Hynix HMS720x
329 select ARCH_SUPPORTS_MSI
332 Support for Intel's IOP13XX (XScale) family of processors.
341 select ARCH_REQUIRE_GPIOLIB
343 Support for Intel's 80219 and IOP32X (XScale) family of
353 select ARCH_REQUIRE_GPIOLIB
355 Support for Intel's IOP33X (XScale) family of processors.
363 Support for Intel's IXP23xx (XScale) family of processors.
366 bool "IXP2400/2800-based"
371 Support for Intel's IXP2400/2800 (XScale) family of processors.
379 select GENERIC_CLOCKEVENTS
380 select DMABOUNCE if PCI
382 Support for Intel's IXP4XX (XScale) family of processors.
389 Say Y here if you intend to run this kernel on a LinkUp Systems
390 L7200 Software Development Board which uses an ARM720T processor.
391 Information on this board can be obtained at:
393 <http://www.linkupsys.com/>
395 If you have any questions or comments about the Linux kernel port
396 to this board, send e-mail to <sjhill@cotw.com>.
399 bool "Marvell Kirkwood"
404 select GENERIC_CLOCKEVENTS
407 Support for the following Marvell Kirkwood series SoCs:
408 88F6180, 88F6192 and 88F6281.
411 bool "Marvell Loki (88RC8480)"
414 select GENERIC_CLOCKEVENTS
417 Support for the Marvell Loki (88RC8480) SoC.
420 bool "Marvell MV78xx0"
425 select GENERIC_CLOCKEVENTS
428 Support for the following Marvell MV78xx0 series SoCs:
438 select GENERIC_CLOCKEVENTS
441 Support for the following Marvell Orion 5x series SoCs:
442 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
443 Orion-2 (5281), Orion-1-90 (6183).
446 bool "Marvell PXA168/910"
449 select ARCH_REQUIRE_GPIOLIB
453 select GENERIC_CLOCKEVENTS
457 Support for Marvell's PXA168/910 processor line.
460 bool "Micrel/Kendin KS8695"
463 select ARCH_REQUIRE_GPIOLIB
465 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
466 System-on-Chip devices.
469 bool "NetSilicon NS9xxx"
473 select GENERIC_CLOCKEVENTS
476 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
479 <http://www.digi.com/products/microprocessors/index.jsp>
482 bool "Nuvoton W90X900 CPU"
485 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
486 can login www.mcuos.com or www.nuvoton.com to know more.
489 bool "Philips Nexperia PNX4008 Mobile"
493 This enables support for Philips PNX4008 mobile platform.
496 bool "PXA2xx/PXA3xx-based"
502 select ARCH_REQUIRE_GPIOLIB
504 select GENERIC_CLOCKEVENTS
508 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
514 select GENERIC_CLOCKEVENTS
516 Support for Qualcomm MSM7K based systems. This runs on the ARM11
517 apps processor of the MSM7K and depends on a shared memory
518 interface to the ARM9 modem processor which runs the baseband stack
519 and controls some vital subsystems (clock and power control, etc).
526 select ARCH_MAY_HAVE_PC_FDC
527 select HAVE_PATA_PLATFORM
530 select ARCH_SPARSEMEM_ENABLE
532 On the Acorn Risc-PC, Linux can support the internal IDE disk and
533 CD-ROM interface, serial and parallel port, and the floppy drive.
539 select ARCH_SPARSEMEM_ENABLE
543 select GENERIC_CLOCKEVENTS
546 select ARCH_REQUIRE_GPIOLIB
548 Support for StrongARM 11x0 based boards.
551 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
555 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
556 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
557 the Samsung SMDK2410 development board (and derivatives).
560 bool "Samsung S3C64XX"
564 Samsung S3C64XX series based systems
574 Support for the StrongARM based Digital DNARD machine, also known
575 as "Shark" (<http://www.shark-linux.de/shark.html>).
580 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
581 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
583 Say Y here for systems based on one of the Sharp LH7A40X
584 System on a Chip processors. These CPUs include an ARM922T
585 core with a wide array of integrated devices for
586 hand-held and low-power applications.
592 select GENERIC_CLOCKEVENTS
594 select ARCH_REQUIRE_GPIOLIB
599 select GENERIC_ALLOCATOR
601 Support for TI's DaVinci platform.
607 select ARCH_REQUIRE_GPIOLIB
609 select GENERIC_CLOCKEVENTS
611 Support for TI's OMAP platform (OMAP1 and OMAP2).
615 source "arch/arm/mach-clps711x/Kconfig"
617 source "arch/arm/mach-ep93xx/Kconfig"
619 source "arch/arm/mach-footbridge/Kconfig"
621 source "arch/arm/mach-gemini/Kconfig"
623 source "arch/arm/mach-integrator/Kconfig"
625 source "arch/arm/mach-iop32x/Kconfig"
627 source "arch/arm/mach-iop33x/Kconfig"
629 source "arch/arm/mach-iop13xx/Kconfig"
631 source "arch/arm/mach-ixp4xx/Kconfig"
633 source "arch/arm/mach-ixp2000/Kconfig"
635 source "arch/arm/mach-ixp23xx/Kconfig"
637 source "arch/arm/mach-loki/Kconfig"
639 source "arch/arm/mach-mv78xx0/Kconfig"
641 source "arch/arm/mach-pxa/Kconfig"
642 source "arch/arm/plat-pxa/Kconfig"
644 source "arch/arm/mach-mmp/Kconfig"
646 source "arch/arm/mach-sa1100/Kconfig"
648 source "arch/arm/plat-omap/Kconfig"
650 source "arch/arm/mach-omap1/Kconfig"
652 source "arch/arm/mach-omap2/Kconfig"
654 source "arch/arm/mach-orion5x/Kconfig"
656 source "arch/arm/mach-kirkwood/Kconfig"
658 source "arch/arm/plat-s3c24xx/Kconfig"
659 source "arch/arm/plat-s3c64xx/Kconfig"
660 source "arch/arm/plat-s3c/Kconfig"
663 source "arch/arm/mach-s3c2400/Kconfig"
664 source "arch/arm/mach-s3c2410/Kconfig"
665 source "arch/arm/mach-s3c2412/Kconfig"
666 source "arch/arm/mach-s3c2440/Kconfig"
667 source "arch/arm/mach-s3c2442/Kconfig"
668 source "arch/arm/mach-s3c2443/Kconfig"
672 source "arch/arm/mach-s3c6400/Kconfig"
673 source "arch/arm/mach-s3c6410/Kconfig"
676 source "arch/arm/mach-lh7a40x/Kconfig"
678 source "arch/arm/mach-h720x/Kconfig"
680 source "arch/arm/mach-versatile/Kconfig"
682 source "arch/arm/mach-aaec2000/Kconfig"
684 source "arch/arm/mach-realview/Kconfig"
686 source "arch/arm/mach-at91/Kconfig"
688 source "arch/arm/plat-mxc/Kconfig"
690 source "arch/arm/mach-netx/Kconfig"
692 source "arch/arm/mach-ns9xxx/Kconfig"
694 source "arch/arm/mach-davinci/Kconfig"
696 source "arch/arm/mach-ks8695/Kconfig"
698 source "arch/arm/mach-msm/Kconfig"
700 source "arch/arm/mach-w90x900/Kconfig"
702 # Definitions to make life easier
715 source arch/arm/mm/Kconfig
718 bool "Enable iWMMXt support"
719 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
720 default y if PXA27x || PXA3xx || ARCH_MMP
722 Enable support for iWMMXt context switching at run time if
723 running on a CPU that supports it.
725 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
728 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
732 source "arch/arm/Kconfig-nommu"
735 config ARM_ERRATA_411920
736 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
737 depends on CPU_V6 && !SMP
739 Invalidation of the Instruction Cache operation can
740 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
741 It does not affect the MPCore. This option enables the ARM Ltd.
742 recommended workaround.
744 config ARM_ERRATA_430973
745 bool "ARM errata: Stale prediction on replaced interworking branch"
748 This option enables the workaround for the 430973 Cortex-A8
749 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
750 interworking branch is replaced with another code sequence at the
751 same virtual address, whether due to self-modifying code or virtual
752 to physical address re-mapping, Cortex-A8 does not recover from the
753 stale interworking branch prediction. This results in Cortex-A8
754 executing the new code sequence in the incorrect ARM or Thumb state.
755 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
756 and also flushes the branch target cache at every context switch.
757 Note that setting specific bits in the ACTLR register may not be
758 available in non-secure mode.
760 config ARM_ERRATA_458693
761 bool "ARM errata: Processor deadlock when a false hazard is created"
764 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
765 erratum. For very specific sequences of memory operations, it is
766 possible for a hazard condition intended for a cache line to instead
767 be incorrectly associated with a different cache line. This false
768 hazard might then cause a processor deadlock. The workaround enables
769 the L1 caching of the NEON accesses and disables the PLD instruction
770 in the ACTLR register. Note that setting specific bits in the ACTLR
771 register may not be available in non-secure mode.
773 config ARM_ERRATA_460075
774 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
777 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
778 erratum. Any asynchronous access to the L2 cache may encounter a
779 situation in which recent store transactions to the L2 cache are lost
780 and overwritten with stale memory contents from external memory. The
781 workaround disables the write-allocate mode for the L2 cache via the
782 ACTLR register. Note that setting specific bits in the ACTLR register
783 may not be available in non-secure mode.
787 source "arch/arm/common/Kconfig"
789 config FORCE_MAX_ZONEORDER
802 Find out whether you have ISA slots on your motherboard. ISA is the
803 name of a bus system, i.e. the way the CPU talks to the other stuff
804 inside your box. Other bus systems are PCI, EISA, MicroChannel
805 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
806 newer boards don't support it. If you have ISA, say Y, otherwise N.
808 # Select ISA DMA controller support
813 # Select ISA DMA interface
818 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
820 Find out whether you have a PCI motherboard. PCI is the name of a
821 bus system, i.e. the way the CPU talks to the other stuff inside
822 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
823 VESA. If you have PCI, say Y, otherwise N.
828 # Select the host bridge type
829 config PCI_HOST_VIA82C505
831 depends on PCI && ARCH_SHARK
834 config PCI_HOST_ITE8152
836 depends on PCI && MACH_ARMCORE
840 source "drivers/pci/Kconfig"
842 source "drivers/pcmcia/Kconfig"
846 menu "Kernel Features"
848 source "kernel/time/Kconfig"
851 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
852 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
853 select USE_GENERIC_SMP_HELPERS
855 This enables support for systems with more than one CPU. If you have
856 a system with only one CPU, like most personal computers, say N. If
857 you have a system with more than one CPU, say Y.
859 If you say N here, the kernel will run on single and multiprocessor
860 machines, but will use only one CPU of a multiprocessor machine. If
861 you say Y here, the kernel will run on many, but not all, single
862 processor machines. On a single processor machine, the kernel will
863 run faster if you say N here.
865 See also <file:Documentation/i386/IO-APIC.txt>,
866 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
867 <http://www.linuxdoc.org/docs.html#howto>.
869 If you don't know what to do here, say N.
872 prompt "Memory split"
875 Select the desired split between kernel and user memory.
877 If you are not absolutely sure what you are doing, leave this
881 bool "3G/1G user/kernel split"
883 bool "2G/2G user/kernel split"
885 bool "1G/3G user/kernel split"
890 default 0x40000000 if VMSPLIT_1G
891 default 0x80000000 if VMSPLIT_2G
895 int "Maximum number of CPUs (2-32)"
901 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
902 depends on SMP && HOTPLUG && EXPERIMENTAL
904 Say Y here to experiment with turning CPUs off and on. CPUs
905 can be controlled through /sys/devices/system/cpu.
908 bool "Use local timer interrupts"
909 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
912 Enable support for local timers on SMP platforms, rather then the
913 legacy IPI broadcast method. Local timers allows the system
914 accounting to be spread across the timer interval, preventing a
915 "thundering herd" at every timer tick.
918 bool "Preemptible Kernel (EXPERIMENTAL)"
919 depends on EXPERIMENTAL
921 This option reduces the latency of the kernel when reacting to
922 real-time or interactive events by allowing a low priority process to
923 be preempted even if it is in kernel mode executing a system call.
924 This allows applications to run more reliably even when the system is
927 Say Y here if you are building a kernel for a desktop, embedded
928 or real-time system. Say N if you are unsure.
932 default 128 if ARCH_L7200
933 default 200 if ARCH_EBSA110 || ARCH_S3C2410
934 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
935 default AT91_TIMER_HZ if ARCH_AT91
939 bool "Use the ARM EABI to compile the kernel"
941 This option allows for the kernel to be compiled using the latest
942 ARM ABI (aka EABI). This is only useful if you are using a user
943 space environment that is also compiled with EABI.
945 Since there are major incompatibilities between the legacy ABI and
946 EABI, especially with regard to structure member alignment, this
947 option also changes the kernel syscall calling convention to
948 disambiguate both ABIs and allow for backward compatibility support
949 (selected with CONFIG_OABI_COMPAT).
951 To use this you need GCC version 4.0.0 or later.
954 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
955 depends on AEABI && EXPERIMENTAL
958 This option preserves the old syscall interface along with the
959 new (ARM EABI) one. It also provides a compatibility layer to
960 intercept syscalls that have structure arguments which layout
961 in memory differs between the legacy ABI and the new ARM EABI
962 (only for non "thumb" binaries). This option adds a tiny
963 overhead to all syscalls and produces a slightly larger kernel.
964 If you know you'll be using only pure EABI user space then you
965 can say N here. If this option is not selected and you attempt
966 to execute a legacy ABI binary then the result will be
967 UNPREDICTABLE (in fact it can be predicted that it won't work
968 at all). If in doubt say Y.
970 config ARCH_HAS_HOLES_MEMORYMODEL
974 # Discontigmem is deprecated
975 config ARCH_DISCONTIGMEM_ENABLE
978 config ARCH_SPARSEMEM_ENABLE
981 config ARCH_SPARSEMEM_DEFAULT
982 def_bool ARCH_SPARSEMEM_ENABLE
984 config ARCH_SELECT_MEMORY_MODEL
985 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
989 default "4" if ARCH_LH7A40X
991 depends on NEED_MULTIPLE_NODES
994 bool "High Memory Support (EXPERIMENTAL)"
995 depends on MMU && EXPERIMENTAL
997 The address space of ARM processors is only 4 Gigabytes large
998 and it has to accommodate user address space, kernel address
999 space as well as some memory mapped IO. That means that, if you
1000 have a large amount of physical memory and/or IO, not all of the
1001 memory can be "permanently mapped" by the kernel. The physical
1002 memory that is not permanently mapped is called "high memory".
1004 Depending on the selected kernel/user memory split, minimum
1005 vmalloc space and actual amount of RAM, you may not need this
1006 option which should result in a slightly faster kernel.
1013 bool "Timer and CPU usage LEDs"
1014 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1015 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1016 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1017 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1018 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1019 ARCH_AT91 || ARCH_DAVINCI || \
1020 ARCH_KS8695 || MACH_RD88F5182
1022 If you say Y here, the LEDs on your machine will be used
1023 to provide useful information about your current system status.
1025 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1026 be able to select which LEDs are active using the options below. If
1027 you are compiling a kernel for the EBSA-110 or the LART however, the
1028 red LED will simply flash regularly to indicate that the system is
1029 still functional. It is safe to say Y here if you have a CATS
1030 system, but the driver will do nothing.
1033 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1034 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1035 || MACH_OMAP_PERSEUS2
1037 depends on !GENERIC_CLOCKEVENTS
1038 default y if ARCH_EBSA110
1040 If you say Y here, one of the system LEDs (the green one on the
1041 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1042 will flash regularly to indicate that the system is still
1043 operational. This is mainly useful to kernel hackers who are
1044 debugging unstable kernels.
1046 The LART uses the same LED for both Timer LED and CPU usage LED
1047 functions. You may choose to use both, but the Timer LED function
1048 will overrule the CPU usage LED.
1051 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1053 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1054 || MACH_OMAP_PERSEUS2
1057 If you say Y here, the red LED will be used to give a good real
1058 time indication of CPU usage, by lighting whenever the idle task
1059 is not currently executing.
1061 The LART uses the same LED for both Timer LED and CPU usage LED
1062 functions. You may choose to use both, but the Timer LED function
1063 will overrule the CPU usage LED.
1065 config ALIGNMENT_TRAP
1067 depends on CPU_CP15_MMU
1068 default y if !ARCH_EBSA110
1070 ARM processors cannot fetch/store information which is not
1071 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1072 address divisible by 4. On 32-bit ARM processors, these non-aligned
1073 fetch/store instructions will be emulated in software if you say
1074 here, which has a severe performance impact. This is necessary for
1075 correct operation of some network protocols. With an IP-only
1076 configuration it is safe to say N, otherwise say Y.
1082 # Compressed boot loader in ROM. Yes, we really want to ask about
1083 # TEXT and BSS so we preserve their values in the config files.
1084 config ZBOOT_ROM_TEXT
1085 hex "Compressed ROM boot loader base address"
1088 The physical address at which the ROM-able zImage is to be
1089 placed in the target. Platforms which normally make use of
1090 ROM-able zImage formats normally set this to a suitable
1091 value in their defconfig file.
1093 If ZBOOT_ROM is not enabled, this has no effect.
1095 config ZBOOT_ROM_BSS
1096 hex "Compressed ROM boot loader BSS address"
1099 The base address of an area of read/write memory in the target
1100 for the ROM-able zImage which must be available while the
1101 decompressor is running. It must be large enough to hold the
1102 entire decompressed kernel plus an additional 128 KiB.
1103 Platforms which normally make use of ROM-able zImage formats
1104 normally set this to a suitable value in their defconfig file.
1106 If ZBOOT_ROM is not enabled, this has no effect.
1109 bool "Compressed boot loader in ROM/flash"
1110 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1112 Say Y here if you intend to execute your compressed kernel image
1113 (zImage) directly from ROM or flash. If unsure, say N.
1116 string "Default kernel command string"
1119 On some architectures (EBSA110 and CATS), there is currently no way
1120 for the boot loader to pass arguments to the kernel. For these
1121 architectures, you should supply some command-line options at build
1122 time by entering them here. As a minimum, you should specify the
1123 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1126 bool "Kernel Execute-In-Place from ROM"
1127 depends on !ZBOOT_ROM
1129 Execute-In-Place allows the kernel to run from non-volatile storage
1130 directly addressable by the CPU, such as NOR flash. This saves RAM
1131 space since the text section of the kernel is not loaded from flash
1132 to RAM. Read-write sections, such as the data section and stack,
1133 are still copied to RAM. The XIP kernel is not compressed since
1134 it has to run directly from flash, so it will take more space to
1135 store it. The flash address used to link the kernel object files,
1136 and for storing it, is configuration dependent. Therefore, if you
1137 say Y here, you must know the proper physical address where to
1138 store the kernel image depending on your own flash memory usage.
1140 Also note that the make target becomes "make xipImage" rather than
1141 "make zImage" or "make Image". The final kernel binary to put in
1142 ROM memory will be arch/arm/boot/xipImage.
1146 config XIP_PHYS_ADDR
1147 hex "XIP Kernel Physical Location"
1148 depends on XIP_KERNEL
1149 default "0x00080000"
1151 This is the physical address in your flash memory the kernel will
1152 be linked for and stored to. This address is dependent on your
1156 bool "Kexec system call (EXPERIMENTAL)"
1157 depends on EXPERIMENTAL
1159 kexec is a system call that implements the ability to shutdown your
1160 current kernel, and to start another kernel. It is like a reboot
1161 but it is independent of the system firmware. And like a reboot
1162 you can start any kernel with it, not just Linux.
1164 It is an ongoing process to be certain the hardware in a machine
1165 is properly shutdown, so do not be surprised if this code does not
1166 initially work for you. It may help to enable device hotplugging
1170 bool "Export atags in procfs"
1174 Should the atags used to boot the kernel be exported in an "atags"
1175 file in procfs. Useful with kexec.
1179 menu "CPU Power Management"
1181 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA)
1183 source "drivers/cpufreq/Kconfig"
1185 config CPU_FREQ_SA1100
1187 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1190 config CPU_FREQ_SA1110
1192 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1195 config CPU_FREQ_INTEGRATOR
1196 tristate "CPUfreq driver for ARM Integrator CPUs"
1197 depends on ARCH_INTEGRATOR && CPU_FREQ
1200 This enables the CPUfreq driver for ARM Integrator CPUs.
1202 For details, take a look at <file:Documentation/cpu-freq>.
1208 depends on CPU_FREQ && ARCH_PXA && PXA25x
1210 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1214 source "drivers/cpuidle/Kconfig"
1218 menu "Floating point emulation"
1220 comment "At least one emulation must be selected"
1223 bool "NWFPE math emulation"
1224 depends on !AEABI || OABI_COMPAT
1226 Say Y to include the NWFPE floating point emulator in the kernel.
1227 This is necessary to run most binaries. Linux does not currently
1228 support floating point hardware so you need to say Y here even if
1229 your machine has an FPA or floating point co-processor podule.
1231 You may say N here if you are going to load the Acorn FPEmulator
1232 early in the bootup.
1235 bool "Support extended precision"
1236 depends on FPE_NWFPE
1238 Say Y to include 80-bit support in the kernel floating-point
1239 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1240 Note that gcc does not generate 80-bit operations by default,
1241 so in most cases this option only enlarges the size of the
1242 floating point emulator without any good reason.
1244 You almost surely want to say N here.
1247 bool "FastFPE math emulation (EXPERIMENTAL)"
1248 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1250 Say Y here to include the FAST floating point emulator in the kernel.
1251 This is an experimental much faster emulator which now also has full
1252 precision for the mantissa. It does not support any exceptions.
1253 It is very simple, and approximately 3-6 times faster than NWFPE.
1255 It should be sufficient for most programs. It may be not suitable
1256 for scientific calculations, but you have to check this for yourself.
1257 If you do not feel you need a faster FP emulation you should better
1261 bool "VFP-format floating point maths"
1262 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1264 Say Y to include VFP support code in the kernel. This is needed
1265 if your hardware includes a VFP unit.
1267 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1268 release notes and additional status information.
1270 Say N if your target does not have VFP hardware.
1278 bool "Advanced SIMD (NEON) Extension support"
1279 depends on VFPv3 && CPU_V7
1281 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1286 menu "Userspace binary formats"
1288 source "fs/Kconfig.binfmt"
1291 tristate "RISC OS personality"
1294 Say Y here to include the kernel code necessary if you want to run
1295 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1296 experimental; if this sounds frightening, say N and sleep in peace.
1297 You can also say M here to compile this support as a module (which
1298 will be called arthur).
1302 menu "Power management options"
1304 source "kernel/power/Kconfig"
1306 config ARCH_SUSPEND_POSSIBLE
1311 source "net/Kconfig"
1313 menu "Device Drivers"
1315 source "drivers/base/Kconfig"
1317 source "drivers/connector/Kconfig"
1319 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1320 source "drivers/mtd/Kconfig"
1323 source "drivers/parport/Kconfig"
1325 source "drivers/pnp/Kconfig"
1327 source "drivers/block/Kconfig"
1329 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1331 source "drivers/misc/Kconfig"
1333 source "drivers/ide/Kconfig"
1335 source "drivers/scsi/Kconfig"
1337 source "drivers/ata/Kconfig"
1339 source "drivers/md/Kconfig"
1341 source "drivers/message/fusion/Kconfig"
1343 source "drivers/ieee1394/Kconfig"
1345 source "drivers/message/i2o/Kconfig"
1347 source "drivers/net/Kconfig"
1349 source "drivers/isdn/Kconfig"
1351 # input before char - char/joystick depends on it. As does USB.
1353 source "drivers/input/Kconfig"
1355 source "drivers/char/Kconfig"
1357 source "drivers/i2c/Kconfig"
1359 source "drivers/spi/Kconfig"
1361 source "drivers/gpio/Kconfig"
1363 source "drivers/w1/Kconfig"
1365 source "drivers/power/Kconfig"
1367 source "drivers/hwmon/Kconfig"
1369 source "drivers/thermal/Kconfig"
1371 source "drivers/watchdog/Kconfig"
1373 source "drivers/ssb/Kconfig"
1375 #source "drivers/l3/Kconfig"
1377 source "drivers/mfd/Kconfig"
1379 source "drivers/media/Kconfig"
1381 source "drivers/video/Kconfig"
1383 source "sound/Kconfig"
1385 source "drivers/hid/Kconfig"
1387 source "drivers/usb/Kconfig"
1389 source "drivers/uwb/Kconfig"
1391 source "drivers/mmc/Kconfig"
1393 source "drivers/memstick/Kconfig"
1395 source "drivers/accessibility/Kconfig"
1397 source "drivers/leds/Kconfig"
1399 source "drivers/rtc/Kconfig"
1401 source "drivers/dma/Kconfig"
1403 source "drivers/dca/Kconfig"
1405 source "drivers/auxdisplay/Kconfig"
1407 source "drivers/regulator/Kconfig"
1409 source "drivers/uio/Kconfig"
1411 source "drivers/staging/Kconfig"
1417 source "arch/arm/Kconfig.debug"
1419 source "security/Kconfig"
1421 source "crypto/Kconfig"
1423 source "lib/Kconfig"