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 "Hilscher NetX based"
305 select GENERIC_CLOCKEVENTS
308 This enables support for systems based on the Hilscher NetX Soc
311 bool "Hynix HMS720x-based"
315 This enables support for systems based on the Hynix HMS720x
323 select ARCH_SUPPORTS_MSI
326 Support for Intel's IOP13XX (XScale) family of processors.
335 select ARCH_REQUIRE_GPIOLIB
337 Support for Intel's 80219 and IOP32X (XScale) family of
347 select ARCH_REQUIRE_GPIOLIB
349 Support for Intel's IOP33X (XScale) family of processors.
357 Support for Intel's IXP23xx (XScale) family of processors.
360 bool "IXP2400/2800-based"
365 Support for Intel's IXP2400/2800 (XScale) family of processors.
373 select GENERIC_CLOCKEVENTS
374 select DMABOUNCE if PCI
376 Support for Intel's IXP4XX (XScale) family of processors.
383 Say Y here if you intend to run this kernel on a LinkUp Systems
384 L7200 Software Development Board which uses an ARM720T processor.
385 Information on this board can be obtained at:
387 <http://www.linkupsys.com/>
389 If you have any questions or comments about the Linux kernel port
390 to this board, send e-mail to <sjhill@cotw.com>.
393 bool "Marvell Kirkwood"
398 select GENERIC_CLOCKEVENTS
401 Support for the following Marvell Kirkwood series SoCs:
402 88F6180, 88F6192 and 88F6281.
405 bool "Marvell Loki (88RC8480)"
408 select GENERIC_CLOCKEVENTS
411 Support for the Marvell Loki (88RC8480) SoC.
414 bool "Marvell MV78xx0"
419 select GENERIC_CLOCKEVENTS
422 Support for the following Marvell MV78xx0 series SoCs:
432 select GENERIC_CLOCKEVENTS
435 Support for the following Marvell Orion 5x series SoCs:
436 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
437 Orion-2 (5281), Orion-1-90 (6183).
440 bool "Marvell PXA168/910"
443 select ARCH_REQUIRE_GPIOLIB
447 select GENERIC_CLOCKEVENTS
451 Support for Marvell's PXA168/910 processor line.
454 bool "Micrel/Kendin KS8695"
457 select ARCH_REQUIRE_GPIOLIB
459 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
460 System-on-Chip devices.
463 bool "NetSilicon NS9xxx"
467 select GENERIC_CLOCKEVENTS
470 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
473 <http://www.digi.com/products/microprocessors/index.jsp>
476 bool "Nuvoton W90X900 CPU"
479 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
480 can login www.mcuos.com or www.nuvoton.com to know more.
483 bool "Philips Nexperia PNX4008 Mobile"
487 This enables support for Philips PNX4008 mobile platform.
490 bool "PXA2xx/PXA3xx-based"
496 select ARCH_REQUIRE_GPIOLIB
498 select GENERIC_CLOCKEVENTS
502 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
508 select GENERIC_CLOCKEVENTS
510 Support for Qualcomm MSM7K based systems. This runs on the ARM11
511 apps processor of the MSM7K and depends on a shared memory
512 interface to the ARM9 modem processor which runs the baseband stack
513 and controls some vital subsystems (clock and power control, etc).
520 select ARCH_MAY_HAVE_PC_FDC
521 select HAVE_PATA_PLATFORM
524 select ARCH_SPARSEMEM_ENABLE
526 On the Acorn Risc-PC, Linux can support the internal IDE disk and
527 CD-ROM interface, serial and parallel port, and the floppy drive.
533 select ARCH_SPARSEMEM_ENABLE
537 select GENERIC_CLOCKEVENTS
540 select ARCH_REQUIRE_GPIOLIB
542 Support for StrongARM 11x0 based boards.
545 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
549 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
550 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
551 the Samsung SMDK2410 development board (and derivatives).
554 bool "Samsung S3C64XX"
558 Samsung S3C64XX series based systems
568 Support for the StrongARM based Digital DNARD machine, also known
569 as "Shark" (<http://www.shark-linux.de/shark.html>).
574 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
575 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
577 Say Y here for systems based on one of the Sharp LH7A40X
578 System on a Chip processors. These CPUs include an ARM922T
579 core with a wide array of integrated devices for
580 hand-held and low-power applications.
586 select GENERIC_CLOCKEVENTS
588 select ARCH_REQUIRE_GPIOLIB
593 select GENERIC_ALLOCATOR
595 Support for TI's DaVinci platform.
601 select ARCH_REQUIRE_GPIOLIB
603 select GENERIC_CLOCKEVENTS
605 Support for TI's OMAP platform (OMAP1 and OMAP2).
609 source "arch/arm/mach-clps711x/Kconfig"
611 source "arch/arm/mach-ep93xx/Kconfig"
613 source "arch/arm/mach-footbridge/Kconfig"
615 source "arch/arm/mach-gemini/Kconfig"
617 source "arch/arm/mach-integrator/Kconfig"
619 source "arch/arm/mach-iop32x/Kconfig"
621 source "arch/arm/mach-iop33x/Kconfig"
623 source "arch/arm/mach-iop13xx/Kconfig"
625 source "arch/arm/mach-ixp4xx/Kconfig"
627 source "arch/arm/mach-ixp2000/Kconfig"
629 source "arch/arm/mach-ixp23xx/Kconfig"
631 source "arch/arm/mach-loki/Kconfig"
633 source "arch/arm/mach-mv78xx0/Kconfig"
635 source "arch/arm/mach-pxa/Kconfig"
636 source "arch/arm/plat-pxa/Kconfig"
638 source "arch/arm/mach-mmp/Kconfig"
640 source "arch/arm/mach-sa1100/Kconfig"
642 source "arch/arm/plat-omap/Kconfig"
644 source "arch/arm/mach-omap1/Kconfig"
646 source "arch/arm/mach-omap2/Kconfig"
648 source "arch/arm/mach-orion5x/Kconfig"
650 source "arch/arm/mach-kirkwood/Kconfig"
652 source "arch/arm/plat-s3c24xx/Kconfig"
653 source "arch/arm/plat-s3c64xx/Kconfig"
654 source "arch/arm/plat-s3c/Kconfig"
657 source "arch/arm/mach-s3c2400/Kconfig"
658 source "arch/arm/mach-s3c2410/Kconfig"
659 source "arch/arm/mach-s3c2412/Kconfig"
660 source "arch/arm/mach-s3c2440/Kconfig"
661 source "arch/arm/mach-s3c2442/Kconfig"
662 source "arch/arm/mach-s3c2443/Kconfig"
666 source "arch/arm/mach-s3c6400/Kconfig"
667 source "arch/arm/mach-s3c6410/Kconfig"
670 source "arch/arm/mach-lh7a40x/Kconfig"
672 source "arch/arm/mach-h720x/Kconfig"
674 source "arch/arm/mach-versatile/Kconfig"
676 source "arch/arm/mach-aaec2000/Kconfig"
678 source "arch/arm/mach-realview/Kconfig"
680 source "arch/arm/mach-at91/Kconfig"
682 source "arch/arm/plat-mxc/Kconfig"
684 source "arch/arm/mach-netx/Kconfig"
686 source "arch/arm/mach-ns9xxx/Kconfig"
688 source "arch/arm/mach-davinci/Kconfig"
690 source "arch/arm/mach-ks8695/Kconfig"
692 source "arch/arm/mach-msm/Kconfig"
694 source "arch/arm/mach-w90x900/Kconfig"
696 # Definitions to make life easier
709 source arch/arm/mm/Kconfig
712 bool "Enable iWMMXt support"
713 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
714 default y if PXA27x || PXA3xx || ARCH_MMP
716 Enable support for iWMMXt context switching at run time if
717 running on a CPU that supports it.
719 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
722 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
726 source "arch/arm/Kconfig-nommu"
729 config ARM_ERRATA_411920
730 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
731 depends on CPU_V6 && !SMP
733 Invalidation of the Instruction Cache operation can
734 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
735 It does not affect the MPCore. This option enables the ARM Ltd.
736 recommended workaround.
738 config ARM_ERRATA_430973
739 bool "ARM errata: Stale prediction on replaced interworking branch"
742 This option enables the workaround for the 430973 Cortex-A8
743 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
744 interworking branch is replaced with another code sequence at the
745 same virtual address, whether due to self-modifying code or virtual
746 to physical address re-mapping, Cortex-A8 does not recover from the
747 stale interworking branch prediction. This results in Cortex-A8
748 executing the new code sequence in the incorrect ARM or Thumb state.
749 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
750 and also flushes the branch target cache at every context switch.
751 Note that setting specific bits in the ACTLR register may not be
752 available in non-secure mode.
754 config ARM_ERRATA_458693
755 bool "ARM errata: Processor deadlock when a false hazard is created"
758 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
759 erratum. For very specific sequences of memory operations, it is
760 possible for a hazard condition intended for a cache line to instead
761 be incorrectly associated with a different cache line. This false
762 hazard might then cause a processor deadlock. The workaround enables
763 the L1 caching of the NEON accesses and disables the PLD instruction
764 in the ACTLR register. Note that setting specific bits in the ACTLR
765 register may not be available in non-secure mode.
767 config ARM_ERRATA_460075
768 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
771 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
772 erratum. Any asynchronous access to the L2 cache may encounter a
773 situation in which recent store transactions to the L2 cache are lost
774 and overwritten with stale memory contents from external memory. The
775 workaround disables the write-allocate mode for the L2 cache via the
776 ACTLR register. Note that setting specific bits in the ACTLR register
777 may not be available in non-secure mode.
781 source "arch/arm/common/Kconfig"
783 config FORCE_MAX_ZONEORDER
796 Find out whether you have ISA slots on your motherboard. ISA is the
797 name of a bus system, i.e. the way the CPU talks to the other stuff
798 inside your box. Other bus systems are PCI, EISA, MicroChannel
799 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
800 newer boards don't support it. If you have ISA, say Y, otherwise N.
802 # Select ISA DMA controller support
807 # Select ISA DMA interface
812 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
814 Find out whether you have a PCI motherboard. PCI is the name of a
815 bus system, i.e. the way the CPU talks to the other stuff inside
816 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
817 VESA. If you have PCI, say Y, otherwise N.
822 # Select the host bridge type
823 config PCI_HOST_VIA82C505
825 depends on PCI && ARCH_SHARK
828 config PCI_HOST_ITE8152
830 depends on PCI && MACH_ARMCORE
834 source "drivers/pci/Kconfig"
836 source "drivers/pcmcia/Kconfig"
840 menu "Kernel Features"
842 source "kernel/time/Kconfig"
845 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
846 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
847 select USE_GENERIC_SMP_HELPERS
849 This enables support for systems with more than one CPU. If you have
850 a system with only one CPU, like most personal computers, say N. If
851 you have a system with more than one CPU, say Y.
853 If you say N here, the kernel will run on single and multiprocessor
854 machines, but will use only one CPU of a multiprocessor machine. If
855 you say Y here, the kernel will run on many, but not all, single
856 processor machines. On a single processor machine, the kernel will
857 run faster if you say N here.
859 See also <file:Documentation/i386/IO-APIC.txt>,
860 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
861 <http://www.linuxdoc.org/docs.html#howto>.
863 If you don't know what to do here, say N.
866 prompt "Memory split"
869 Select the desired split between kernel and user memory.
871 If you are not absolutely sure what you are doing, leave this
875 bool "3G/1G user/kernel split"
877 bool "2G/2G user/kernel split"
879 bool "1G/3G user/kernel split"
884 default 0x40000000 if VMSPLIT_1G
885 default 0x80000000 if VMSPLIT_2G
889 int "Maximum number of CPUs (2-32)"
895 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
896 depends on SMP && HOTPLUG && EXPERIMENTAL
898 Say Y here to experiment with turning CPUs off and on. CPUs
899 can be controlled through /sys/devices/system/cpu.
902 bool "Use local timer interrupts"
903 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
906 Enable support for local timers on SMP platforms, rather then the
907 legacy IPI broadcast method. Local timers allows the system
908 accounting to be spread across the timer interval, preventing a
909 "thundering herd" at every timer tick.
912 bool "Preemptible Kernel (EXPERIMENTAL)"
913 depends on EXPERIMENTAL
915 This option reduces the latency of the kernel when reacting to
916 real-time or interactive events by allowing a low priority process to
917 be preempted even if it is in kernel mode executing a system call.
918 This allows applications to run more reliably even when the system is
921 Say Y here if you are building a kernel for a desktop, embedded
922 or real-time system. Say N if you are unsure.
926 default 128 if ARCH_L7200
927 default 200 if ARCH_EBSA110 || ARCH_S3C2410
928 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
929 default AT91_TIMER_HZ if ARCH_AT91
933 bool "Use the ARM EABI to compile the kernel"
935 This option allows for the kernel to be compiled using the latest
936 ARM ABI (aka EABI). This is only useful if you are using a user
937 space environment that is also compiled with EABI.
939 Since there are major incompatibilities between the legacy ABI and
940 EABI, especially with regard to structure member alignment, this
941 option also changes the kernel syscall calling convention to
942 disambiguate both ABIs and allow for backward compatibility support
943 (selected with CONFIG_OABI_COMPAT).
945 To use this you need GCC version 4.0.0 or later.
948 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
949 depends on AEABI && EXPERIMENTAL
952 This option preserves the old syscall interface along with the
953 new (ARM EABI) one. It also provides a compatibility layer to
954 intercept syscalls that have structure arguments which layout
955 in memory differs between the legacy ABI and the new ARM EABI
956 (only for non "thumb" binaries). This option adds a tiny
957 overhead to all syscalls and produces a slightly larger kernel.
958 If you know you'll be using only pure EABI user space then you
959 can say N here. If this option is not selected and you attempt
960 to execute a legacy ABI binary then the result will be
961 UNPREDICTABLE (in fact it can be predicted that it won't work
962 at all). If in doubt say Y.
964 config ARCH_HAS_HOLES_MEMORYMODEL
967 # Discontigmem is deprecated
968 config ARCH_DISCONTIGMEM_ENABLE
971 config ARCH_SPARSEMEM_ENABLE
974 config ARCH_SPARSEMEM_DEFAULT
975 def_bool ARCH_SPARSEMEM_ENABLE
977 config ARCH_SELECT_MEMORY_MODEL
978 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
982 default "4" if ARCH_LH7A40X
984 depends on NEED_MULTIPLE_NODES
987 bool "High Memory Support (EXPERIMENTAL)"
988 depends on MMU && EXPERIMENTAL
990 The address space of ARM processors is only 4 Gigabytes large
991 and it has to accommodate user address space, kernel address
992 space as well as some memory mapped IO. That means that, if you
993 have a large amount of physical memory and/or IO, not all of the
994 memory can be "permanently mapped" by the kernel. The physical
995 memory that is not permanently mapped is called "high memory".
997 Depending on the selected kernel/user memory split, minimum
998 vmalloc space and actual amount of RAM, you may not need this
999 option which should result in a slightly faster kernel.
1006 bool "Timer and CPU usage LEDs"
1007 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1008 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1009 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1010 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1011 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1012 ARCH_AT91 || ARCH_DAVINCI || \
1013 ARCH_KS8695 || MACH_RD88F5182
1015 If you say Y here, the LEDs on your machine will be used
1016 to provide useful information about your current system status.
1018 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1019 be able to select which LEDs are active using the options below. If
1020 you are compiling a kernel for the EBSA-110 or the LART however, the
1021 red LED will simply flash regularly to indicate that the system is
1022 still functional. It is safe to say Y here if you have a CATS
1023 system, but the driver will do nothing.
1026 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1027 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1028 || MACH_OMAP_PERSEUS2
1030 depends on !GENERIC_CLOCKEVENTS
1031 default y if ARCH_EBSA110
1033 If you say Y here, one of the system LEDs (the green one on the
1034 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1035 will flash regularly to indicate that the system is still
1036 operational. This is mainly useful to kernel hackers who are
1037 debugging unstable kernels.
1039 The LART uses the same LED for both Timer LED and CPU usage LED
1040 functions. You may choose to use both, but the Timer LED function
1041 will overrule the CPU usage LED.
1044 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1046 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1047 || MACH_OMAP_PERSEUS2
1050 If you say Y here, the red LED will be used to give a good real
1051 time indication of CPU usage, by lighting whenever the idle task
1052 is not currently executing.
1054 The LART uses the same LED for both Timer LED and CPU usage LED
1055 functions. You may choose to use both, but the Timer LED function
1056 will overrule the CPU usage LED.
1058 config ALIGNMENT_TRAP
1060 depends on CPU_CP15_MMU
1061 default y if !ARCH_EBSA110
1063 ARM processors cannot fetch/store information which is not
1064 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1065 address divisible by 4. On 32-bit ARM processors, these non-aligned
1066 fetch/store instructions will be emulated in software if you say
1067 here, which has a severe performance impact. This is necessary for
1068 correct operation of some network protocols. With an IP-only
1069 configuration it is safe to say N, otherwise say Y.
1075 # Compressed boot loader in ROM. Yes, we really want to ask about
1076 # TEXT and BSS so we preserve their values in the config files.
1077 config ZBOOT_ROM_TEXT
1078 hex "Compressed ROM boot loader base address"
1081 The physical address at which the ROM-able zImage is to be
1082 placed in the target. Platforms which normally make use of
1083 ROM-able zImage formats normally set this to a suitable
1084 value in their defconfig file.
1086 If ZBOOT_ROM is not enabled, this has no effect.
1088 config ZBOOT_ROM_BSS
1089 hex "Compressed ROM boot loader BSS address"
1092 The base address of an area of read/write memory in the target
1093 for the ROM-able zImage which must be available while the
1094 decompressor is running. It must be large enough to hold the
1095 entire decompressed kernel plus an additional 128 KiB.
1096 Platforms which normally make use of ROM-able zImage formats
1097 normally set this to a suitable value in their defconfig file.
1099 If ZBOOT_ROM is not enabled, this has no effect.
1102 bool "Compressed boot loader in ROM/flash"
1103 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1105 Say Y here if you intend to execute your compressed kernel image
1106 (zImage) directly from ROM or flash. If unsure, say N.
1109 string "Default kernel command string"
1112 On some architectures (EBSA110 and CATS), there is currently no way
1113 for the boot loader to pass arguments to the kernel. For these
1114 architectures, you should supply some command-line options at build
1115 time by entering them here. As a minimum, you should specify the
1116 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1119 bool "Kernel Execute-In-Place from ROM"
1120 depends on !ZBOOT_ROM
1122 Execute-In-Place allows the kernel to run from non-volatile storage
1123 directly addressable by the CPU, such as NOR flash. This saves RAM
1124 space since the text section of the kernel is not loaded from flash
1125 to RAM. Read-write sections, such as the data section and stack,
1126 are still copied to RAM. The XIP kernel is not compressed since
1127 it has to run directly from flash, so it will take more space to
1128 store it. The flash address used to link the kernel object files,
1129 and for storing it, is configuration dependent. Therefore, if you
1130 say Y here, you must know the proper physical address where to
1131 store the kernel image depending on your own flash memory usage.
1133 Also note that the make target becomes "make xipImage" rather than
1134 "make zImage" or "make Image". The final kernel binary to put in
1135 ROM memory will be arch/arm/boot/xipImage.
1139 config XIP_PHYS_ADDR
1140 hex "XIP Kernel Physical Location"
1141 depends on XIP_KERNEL
1142 default "0x00080000"
1144 This is the physical address in your flash memory the kernel will
1145 be linked for and stored to. This address is dependent on your
1149 bool "Kexec system call (EXPERIMENTAL)"
1150 depends on EXPERIMENTAL
1152 kexec is a system call that implements the ability to shutdown your
1153 current kernel, and to start another kernel. It is like a reboot
1154 but it is independent of the system firmware. And like a reboot
1155 you can start any kernel with it, not just Linux.
1157 It is an ongoing process to be certain the hardware in a machine
1158 is properly shutdown, so do not be surprised if this code does not
1159 initially work for you. It may help to enable device hotplugging
1163 bool "Export atags in procfs"
1167 Should the atags used to boot the kernel be exported in an "atags"
1168 file in procfs. Useful with kexec.
1172 menu "CPU Power Management"
1174 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA)
1176 source "drivers/cpufreq/Kconfig"
1178 config CPU_FREQ_SA1100
1180 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1183 config CPU_FREQ_SA1110
1185 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1188 config CPU_FREQ_INTEGRATOR
1189 tristate "CPUfreq driver for ARM Integrator CPUs"
1190 depends on ARCH_INTEGRATOR && CPU_FREQ
1193 This enables the CPUfreq driver for ARM Integrator CPUs.
1195 For details, take a look at <file:Documentation/cpu-freq>.
1201 depends on CPU_FREQ && ARCH_PXA && PXA25x
1203 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1207 source "drivers/cpuidle/Kconfig"
1211 menu "Floating point emulation"
1213 comment "At least one emulation must be selected"
1216 bool "NWFPE math emulation"
1217 depends on !AEABI || OABI_COMPAT
1219 Say Y to include the NWFPE floating point emulator in the kernel.
1220 This is necessary to run most binaries. Linux does not currently
1221 support floating point hardware so you need to say Y here even if
1222 your machine has an FPA or floating point co-processor podule.
1224 You may say N here if you are going to load the Acorn FPEmulator
1225 early in the bootup.
1228 bool "Support extended precision"
1229 depends on FPE_NWFPE
1231 Say Y to include 80-bit support in the kernel floating-point
1232 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1233 Note that gcc does not generate 80-bit operations by default,
1234 so in most cases this option only enlarges the size of the
1235 floating point emulator without any good reason.
1237 You almost surely want to say N here.
1240 bool "FastFPE math emulation (EXPERIMENTAL)"
1241 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1243 Say Y here to include the FAST floating point emulator in the kernel.
1244 This is an experimental much faster emulator which now also has full
1245 precision for the mantissa. It does not support any exceptions.
1246 It is very simple, and approximately 3-6 times faster than NWFPE.
1248 It should be sufficient for most programs. It may be not suitable
1249 for scientific calculations, but you have to check this for yourself.
1250 If you do not feel you need a faster FP emulation you should better
1254 bool "VFP-format floating point maths"
1255 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1257 Say Y to include VFP support code in the kernel. This is needed
1258 if your hardware includes a VFP unit.
1260 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1261 release notes and additional status information.
1263 Say N if your target does not have VFP hardware.
1271 bool "Advanced SIMD (NEON) Extension support"
1272 depends on VFPv3 && CPU_V7
1274 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1279 menu "Userspace binary formats"
1281 source "fs/Kconfig.binfmt"
1284 tristate "RISC OS personality"
1287 Say Y here to include the kernel code necessary if you want to run
1288 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1289 experimental; if this sounds frightening, say N and sleep in peace.
1290 You can also say M here to compile this support as a module (which
1291 will be called arthur).
1295 menu "Power management options"
1297 source "kernel/power/Kconfig"
1299 config ARCH_SUSPEND_POSSIBLE
1304 source "net/Kconfig"
1306 menu "Device Drivers"
1308 source "drivers/base/Kconfig"
1310 source "drivers/connector/Kconfig"
1312 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1313 source "drivers/mtd/Kconfig"
1316 source "drivers/parport/Kconfig"
1318 source "drivers/pnp/Kconfig"
1320 source "drivers/block/Kconfig"
1322 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1324 source "drivers/misc/Kconfig"
1326 source "drivers/ide/Kconfig"
1328 source "drivers/scsi/Kconfig"
1330 source "drivers/ata/Kconfig"
1332 source "drivers/md/Kconfig"
1334 source "drivers/message/fusion/Kconfig"
1336 source "drivers/ieee1394/Kconfig"
1338 source "drivers/message/i2o/Kconfig"
1340 source "drivers/net/Kconfig"
1342 source "drivers/isdn/Kconfig"
1344 # input before char - char/joystick depends on it. As does USB.
1346 source "drivers/input/Kconfig"
1348 source "drivers/char/Kconfig"
1350 source "drivers/i2c/Kconfig"
1352 source "drivers/spi/Kconfig"
1354 source "drivers/gpio/Kconfig"
1356 source "drivers/w1/Kconfig"
1358 source "drivers/power/Kconfig"
1360 source "drivers/hwmon/Kconfig"
1362 source "drivers/thermal/Kconfig"
1364 source "drivers/watchdog/Kconfig"
1366 source "drivers/ssb/Kconfig"
1368 #source "drivers/l3/Kconfig"
1370 source "drivers/mfd/Kconfig"
1372 source "drivers/media/Kconfig"
1374 source "drivers/video/Kconfig"
1376 source "sound/Kconfig"
1378 source "drivers/hid/Kconfig"
1380 source "drivers/usb/Kconfig"
1382 source "drivers/uwb/Kconfig"
1384 source "drivers/mmc/Kconfig"
1386 source "drivers/memstick/Kconfig"
1388 source "drivers/accessibility/Kconfig"
1390 source "drivers/leds/Kconfig"
1392 source "drivers/rtc/Kconfig"
1394 source "drivers/dma/Kconfig"
1396 source "drivers/dca/Kconfig"
1398 source "drivers/auxdisplay/Kconfig"
1400 source "drivers/regulator/Kconfig"
1402 source "drivers/uio/Kconfig"
1404 source "drivers/staging/Kconfig"
1410 source "arch/arm/Kconfig.debug"
1412 source "security/Kconfig"
1414 source "crypto/Kconfig"
1416 source "lib/Kconfig"