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"
397 select ARCH_REQUIRE_GPIOLIB
399 select GENERIC_CLOCKEVENTS
402 Support for the following Marvell Kirkwood series SoCs:
403 88F6180, 88F6192 and 88F6281.
406 bool "Marvell Loki (88RC8480)"
409 select GENERIC_CLOCKEVENTS
412 Support for the Marvell Loki (88RC8480) SoC.
415 bool "Marvell MV78xx0"
419 select ARCH_REQUIRE_GPIOLIB
421 select GENERIC_CLOCKEVENTS
424 Support for the following Marvell MV78xx0 series SoCs:
433 select ARCH_REQUIRE_GPIOLIB
435 select GENERIC_CLOCKEVENTS
438 Support for the following Marvell Orion 5x series SoCs:
439 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
440 Orion-2 (5281), Orion-1-90 (6183).
443 bool "Marvell PXA168/910"
446 select ARCH_REQUIRE_GPIOLIB
450 select GENERIC_CLOCKEVENTS
454 Support for Marvell's PXA168/910 processor line.
457 bool "Micrel/Kendin KS8695"
460 select ARCH_REQUIRE_GPIOLIB
462 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
463 System-on-Chip devices.
466 bool "NetSilicon NS9xxx"
470 select GENERIC_CLOCKEVENTS
473 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
476 <http://www.digi.com/products/microprocessors/index.jsp>
479 bool "Nuvoton W90X900 CPU"
481 select ARCH_REQUIRE_GPIOLIB
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 ||ARCH_OMAP4)
853 depends on GENERIC_CLOCKEVENTS
854 select USE_GENERIC_SMP_HELPERS
855 select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4)
857 This enables support for systems with more than one CPU. If you have
858 a system with only one CPU, like most personal computers, say N. If
859 you have a system with more than one CPU, say Y.
861 If you say N here, the kernel will run on single and multiprocessor
862 machines, but will use only one CPU of a multiprocessor machine. If
863 you say Y here, the kernel will run on many, but not all, single
864 processor machines. On a single processor machine, the kernel will
865 run faster if you say N here.
867 See also <file:Documentation/i386/IO-APIC.txt>,
868 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
869 <http://www.linuxdoc.org/docs.html#howto>.
871 If you don't know what to do here, say N.
877 This option enables support for the ARM system coherency unit
883 This options enables support for the ARM timer and watchdog unit
886 prompt "Memory split"
889 Select the desired split between kernel and user memory.
891 If you are not absolutely sure what you are doing, leave this
895 bool "3G/1G user/kernel split"
897 bool "2G/2G user/kernel split"
899 bool "1G/3G user/kernel split"
904 default 0x40000000 if VMSPLIT_1G
905 default 0x80000000 if VMSPLIT_2G
909 int "Maximum number of CPUs (2-32)"
915 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
916 depends on SMP && HOTPLUG && EXPERIMENTAL
918 Say Y here to experiment with turning CPUs off and on. CPUs
919 can be controlled through /sys/devices/system/cpu.
922 bool "Use local timer interrupts"
923 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP || ARCH_OMAP4)
925 select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4)
927 Enable support for local timers on SMP platforms, rather then the
928 legacy IPI broadcast method. Local timers allows the system
929 accounting to be spread across the timer interval, preventing a
930 "thundering herd" at every timer tick.
933 bool "Preemptible Kernel (EXPERIMENTAL)"
934 depends on EXPERIMENTAL
936 This option reduces the latency of the kernel when reacting to
937 real-time or interactive events by allowing a low priority process to
938 be preempted even if it is in kernel mode executing a system call.
939 This allows applications to run more reliably even when the system is
942 Say Y here if you are building a kernel for a desktop, embedded
943 or real-time system. Say N if you are unsure.
947 default 128 if ARCH_L7200
948 default 200 if ARCH_EBSA110 || ARCH_S3C2410
949 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
950 default AT91_TIMER_HZ if ARCH_AT91
954 bool "Use the ARM EABI to compile the kernel"
956 This option allows for the kernel to be compiled using the latest
957 ARM ABI (aka EABI). This is only useful if you are using a user
958 space environment that is also compiled with EABI.
960 Since there are major incompatibilities between the legacy ABI and
961 EABI, especially with regard to structure member alignment, this
962 option also changes the kernel syscall calling convention to
963 disambiguate both ABIs and allow for backward compatibility support
964 (selected with CONFIG_OABI_COMPAT).
966 To use this you need GCC version 4.0.0 or later.
969 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
970 depends on AEABI && EXPERIMENTAL
973 This option preserves the old syscall interface along with the
974 new (ARM EABI) one. It also provides a compatibility layer to
975 intercept syscalls that have structure arguments which layout
976 in memory differs between the legacy ABI and the new ARM EABI
977 (only for non "thumb" binaries). This option adds a tiny
978 overhead to all syscalls and produces a slightly larger kernel.
979 If you know you'll be using only pure EABI user space then you
980 can say N here. If this option is not selected and you attempt
981 to execute a legacy ABI binary then the result will be
982 UNPREDICTABLE (in fact it can be predicted that it won't work
983 at all). If in doubt say Y.
985 config ARCH_HAS_HOLES_MEMORYMODEL
988 # Discontigmem is deprecated
989 config ARCH_DISCONTIGMEM_ENABLE
992 config ARCH_SPARSEMEM_ENABLE
995 config ARCH_SPARSEMEM_DEFAULT
996 def_bool ARCH_SPARSEMEM_ENABLE
998 config ARCH_SELECT_MEMORY_MODEL
999 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
1003 default "4" if ARCH_LH7A40X
1005 depends on NEED_MULTIPLE_NODES
1008 bool "High Memory Support (EXPERIMENTAL)"
1009 depends on MMU && EXPERIMENTAL
1011 The address space of ARM processors is only 4 Gigabytes large
1012 and it has to accommodate user address space, kernel address
1013 space as well as some memory mapped IO. That means that, if you
1014 have a large amount of physical memory and/or IO, not all of the
1015 memory can be "permanently mapped" by the kernel. The physical
1016 memory that is not permanently mapped is called "high memory".
1018 Depending on the selected kernel/user memory split, minimum
1019 vmalloc space and actual amount of RAM, you may not need this
1020 option which should result in a slightly faster kernel.
1027 bool "Timer and CPU usage LEDs"
1028 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1029 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1030 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1031 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1032 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1033 ARCH_AT91 || ARCH_DAVINCI || \
1034 ARCH_KS8695 || MACH_RD88F5182
1036 If you say Y here, the LEDs on your machine will be used
1037 to provide useful information about your current system status.
1039 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1040 be able to select which LEDs are active using the options below. If
1041 you are compiling a kernel for the EBSA-110 or the LART however, the
1042 red LED will simply flash regularly to indicate that the system is
1043 still functional. It is safe to say Y here if you have a CATS
1044 system, but the driver will do nothing.
1047 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1048 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1049 || MACH_OMAP_PERSEUS2
1051 depends on !GENERIC_CLOCKEVENTS
1052 default y if ARCH_EBSA110
1054 If you say Y here, one of the system LEDs (the green one on the
1055 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1056 will flash regularly to indicate that the system is still
1057 operational. This is mainly useful to kernel hackers who are
1058 debugging unstable kernels.
1060 The LART uses the same LED for both Timer LED and CPU usage LED
1061 functions. You may choose to use both, but the Timer LED function
1062 will overrule the CPU usage LED.
1065 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1067 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1068 || MACH_OMAP_PERSEUS2
1071 If you say Y here, the red LED will be used to give a good real
1072 time indication of CPU usage, by lighting whenever the idle task
1073 is not currently executing.
1075 The LART uses the same LED for both Timer LED and CPU usage LED
1076 functions. You may choose to use both, but the Timer LED function
1077 will overrule the CPU usage LED.
1079 config ALIGNMENT_TRAP
1081 depends on CPU_CP15_MMU
1082 default y if !ARCH_EBSA110
1084 ARM processors cannot fetch/store information which is not
1085 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1086 address divisible by 4. On 32-bit ARM processors, these non-aligned
1087 fetch/store instructions will be emulated in software if you say
1088 here, which has a severe performance impact. This is necessary for
1089 correct operation of some network protocols. With an IP-only
1090 configuration it is safe to say N, otherwise say Y.
1096 # Compressed boot loader in ROM. Yes, we really want to ask about
1097 # TEXT and BSS so we preserve their values in the config files.
1098 config ZBOOT_ROM_TEXT
1099 hex "Compressed ROM boot loader base address"
1102 The physical address at which the ROM-able zImage is to be
1103 placed in the target. Platforms which normally make use of
1104 ROM-able zImage formats normally set this to a suitable
1105 value in their defconfig file.
1107 If ZBOOT_ROM is not enabled, this has no effect.
1109 config ZBOOT_ROM_BSS
1110 hex "Compressed ROM boot loader BSS address"
1113 The base address of an area of read/write memory in the target
1114 for the ROM-able zImage which must be available while the
1115 decompressor is running. It must be large enough to hold the
1116 entire decompressed kernel plus an additional 128 KiB.
1117 Platforms which normally make use of ROM-able zImage formats
1118 normally set this to a suitable value in their defconfig file.
1120 If ZBOOT_ROM is not enabled, this has no effect.
1123 bool "Compressed boot loader in ROM/flash"
1124 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1126 Say Y here if you intend to execute your compressed kernel image
1127 (zImage) directly from ROM or flash. If unsure, say N.
1130 string "Default kernel command string"
1133 On some architectures (EBSA110 and CATS), there is currently no way
1134 for the boot loader to pass arguments to the kernel. For these
1135 architectures, you should supply some command-line options at build
1136 time by entering them here. As a minimum, you should specify the
1137 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1140 bool "Kernel Execute-In-Place from ROM"
1141 depends on !ZBOOT_ROM
1143 Execute-In-Place allows the kernel to run from non-volatile storage
1144 directly addressable by the CPU, such as NOR flash. This saves RAM
1145 space since the text section of the kernel is not loaded from flash
1146 to RAM. Read-write sections, such as the data section and stack,
1147 are still copied to RAM. The XIP kernel is not compressed since
1148 it has to run directly from flash, so it will take more space to
1149 store it. The flash address used to link the kernel object files,
1150 and for storing it, is configuration dependent. Therefore, if you
1151 say Y here, you must know the proper physical address where to
1152 store the kernel image depending on your own flash memory usage.
1154 Also note that the make target becomes "make xipImage" rather than
1155 "make zImage" or "make Image". The final kernel binary to put in
1156 ROM memory will be arch/arm/boot/xipImage.
1160 config XIP_PHYS_ADDR
1161 hex "XIP Kernel Physical Location"
1162 depends on XIP_KERNEL
1163 default "0x00080000"
1165 This is the physical address in your flash memory the kernel will
1166 be linked for and stored to. This address is dependent on your
1170 bool "Kexec system call (EXPERIMENTAL)"
1171 depends on EXPERIMENTAL
1173 kexec is a system call that implements the ability to shutdown your
1174 current kernel, and to start another kernel. It is like a reboot
1175 but it is independent of the system firmware. And like a reboot
1176 you can start any kernel with it, not just Linux.
1178 It is an ongoing process to be certain the hardware in a machine
1179 is properly shutdown, so do not be surprised if this code does not
1180 initially work for you. It may help to enable device hotplugging
1184 bool "Export atags in procfs"
1188 Should the atags used to boot the kernel be exported in an "atags"
1189 file in procfs. Useful with kexec.
1193 menu "CPU Power Management"
1195 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_PXA)
1197 source "drivers/cpufreq/Kconfig"
1199 config CPU_FREQ_SA1100
1201 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1204 config CPU_FREQ_SA1110
1206 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1209 config CPU_FREQ_INTEGRATOR
1210 tristate "CPUfreq driver for ARM Integrator CPUs"
1211 depends on ARCH_INTEGRATOR && CPU_FREQ
1214 This enables the CPUfreq driver for ARM Integrator CPUs.
1216 For details, take a look at <file:Documentation/cpu-freq>.
1222 depends on CPU_FREQ && ARCH_PXA && PXA25x
1224 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1228 source "drivers/cpuidle/Kconfig"
1232 menu "Floating point emulation"
1234 comment "At least one emulation must be selected"
1237 bool "NWFPE math emulation"
1238 depends on !AEABI || OABI_COMPAT
1240 Say Y to include the NWFPE floating point emulator in the kernel.
1241 This is necessary to run most binaries. Linux does not currently
1242 support floating point hardware so you need to say Y here even if
1243 your machine has an FPA or floating point co-processor podule.
1245 You may say N here if you are going to load the Acorn FPEmulator
1246 early in the bootup.
1249 bool "Support extended precision"
1250 depends on FPE_NWFPE
1252 Say Y to include 80-bit support in the kernel floating-point
1253 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1254 Note that gcc does not generate 80-bit operations by default,
1255 so in most cases this option only enlarges the size of the
1256 floating point emulator without any good reason.
1258 You almost surely want to say N here.
1261 bool "FastFPE math emulation (EXPERIMENTAL)"
1262 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1264 Say Y here to include the FAST floating point emulator in the kernel.
1265 This is an experimental much faster emulator which now also has full
1266 precision for the mantissa. It does not support any exceptions.
1267 It is very simple, and approximately 3-6 times faster than NWFPE.
1269 It should be sufficient for most programs. It may be not suitable
1270 for scientific calculations, but you have to check this for yourself.
1271 If you do not feel you need a faster FP emulation you should better
1275 bool "VFP-format floating point maths"
1276 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1278 Say Y to include VFP support code in the kernel. This is needed
1279 if your hardware includes a VFP unit.
1281 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1282 release notes and additional status information.
1284 Say N if your target does not have VFP hardware.
1292 bool "Advanced SIMD (NEON) Extension support"
1293 depends on VFPv3 && CPU_V7
1295 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1300 menu "Userspace binary formats"
1302 source "fs/Kconfig.binfmt"
1305 tristate "RISC OS personality"
1308 Say Y here to include the kernel code necessary if you want to run
1309 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1310 experimental; if this sounds frightening, say N and sleep in peace.
1311 You can also say M here to compile this support as a module (which
1312 will be called arthur).
1316 menu "Power management options"
1318 source "kernel/power/Kconfig"
1320 config ARCH_SUSPEND_POSSIBLE
1325 source "net/Kconfig"
1327 menu "Device Drivers"
1329 source "drivers/base/Kconfig"
1331 source "drivers/connector/Kconfig"
1333 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1334 source "drivers/mtd/Kconfig"
1337 source "drivers/parport/Kconfig"
1339 source "drivers/pnp/Kconfig"
1341 source "drivers/block/Kconfig"
1343 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1345 source "drivers/misc/Kconfig"
1347 source "drivers/ide/Kconfig"
1349 source "drivers/scsi/Kconfig"
1351 source "drivers/ata/Kconfig"
1353 source "drivers/md/Kconfig"
1355 source "drivers/message/fusion/Kconfig"
1357 source "drivers/ieee1394/Kconfig"
1359 source "drivers/message/i2o/Kconfig"
1361 source "drivers/net/Kconfig"
1363 source "drivers/isdn/Kconfig"
1365 # input before char - char/joystick depends on it. As does USB.
1367 source "drivers/input/Kconfig"
1369 source "drivers/char/Kconfig"
1371 source "drivers/i2c/Kconfig"
1373 source "drivers/spi/Kconfig"
1375 source "drivers/gpio/Kconfig"
1377 source "drivers/w1/Kconfig"
1379 source "drivers/power/Kconfig"
1381 source "drivers/hwmon/Kconfig"
1383 source "drivers/thermal/Kconfig"
1385 source "drivers/watchdog/Kconfig"
1387 source "drivers/ssb/Kconfig"
1389 #source "drivers/l3/Kconfig"
1391 source "drivers/mfd/Kconfig"
1393 source "drivers/media/Kconfig"
1395 source "drivers/video/Kconfig"
1397 source "sound/Kconfig"
1399 source "drivers/hid/Kconfig"
1401 source "drivers/usb/Kconfig"
1403 source "drivers/uwb/Kconfig"
1405 source "drivers/mmc/Kconfig"
1407 source "drivers/memstick/Kconfig"
1409 source "drivers/accessibility/Kconfig"
1411 source "drivers/leds/Kconfig"
1413 source "drivers/rtc/Kconfig"
1415 source "drivers/dma/Kconfig"
1417 source "drivers/dca/Kconfig"
1419 source "drivers/auxdisplay/Kconfig"
1421 source "drivers/regulator/Kconfig"
1423 source "drivers/uio/Kconfig"
1425 source "drivers/staging/Kconfig"
1431 source "arch/arm/Kconfig.debug"
1433 source "security/Kconfig"
1435 source "crypto/Kconfig"
1437 source "lib/Kconfig"