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
285 This enables support for the Cirrus EP93xx series of CPUs.
287 config ARCH_FOOTBRIDGE
292 Support for systems based on the DC21285 companion chip
293 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
296 bool "Freescale MXC/iMX-based"
298 select GENERIC_CLOCKEVENTS
301 select ARCH_REQUIRE_GPIOLIB
303 Support for Freescale MXC/iMX-based family of processors
306 bool "Freescale STMP3xxx"
310 select ARCH_REQUIRE_GPIOLIB
312 select GENERIC_CLOCKEVENTS
314 select USB_ARCH_HAS_EHCI
316 Support for systems based on the Freescale 3xxx CPUs.
319 bool "Hilscher NetX based"
322 select GENERIC_CLOCKEVENTS
325 This enables support for systems based on the Hilscher NetX Soc
328 bool "Hynix HMS720x-based"
332 This enables support for systems based on the Hynix HMS720x
339 select GENERIC_CLOCKEVENTS
341 Support for Motorola's i.MX family of processors (MX1, MXL).
349 select ARCH_SUPPORTS_MSI
352 Support for Intel's IOP13XX (XScale) family of processors.
361 select ARCH_REQUIRE_GPIOLIB
363 Support for Intel's 80219 and IOP32X (XScale) family of
373 select ARCH_REQUIRE_GPIOLIB
375 Support for Intel's IOP33X (XScale) family of processors.
383 Support for Intel's IXP23xx (XScale) family of processors.
386 bool "IXP2400/2800-based"
391 Support for Intel's IXP2400/2800 (XScale) family of processors.
399 select GENERIC_CLOCKEVENTS
400 select DMABOUNCE if PCI
402 Support for Intel's IXP4XX (XScale) family of processors.
409 Say Y here if you intend to run this kernel on a LinkUp Systems
410 L7200 Software Development Board which uses an ARM720T processor.
411 Information on this board can be obtained at:
413 <http://www.linkupsys.com/>
415 If you have any questions or comments about the Linux kernel port
416 to this board, send e-mail to <sjhill@cotw.com>.
419 bool "Marvell Kirkwood"
424 select GENERIC_CLOCKEVENTS
427 Support for the following Marvell Kirkwood series SoCs:
428 88F6180, 88F6192 and 88F6281.
431 bool "Marvell Loki (88RC8480)"
434 select GENERIC_CLOCKEVENTS
437 Support for the Marvell Loki (88RC8480) SoC.
440 bool "Marvell MV78xx0"
445 select GENERIC_CLOCKEVENTS
448 Support for the following Marvell MV78xx0 series SoCs:
458 select GENERIC_CLOCKEVENTS
461 Support for the following Marvell Orion 5x series SoCs:
462 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
463 Orion-2 (5281), Orion-1-90 (6183).
466 bool "Marvell PXA168/910"
469 select ARCH_REQUIRE_GPIOLIB
473 select GENERIC_CLOCKEVENTS
477 Support for Marvell's PXA168/910 processor line.
480 bool "Micrel/Kendin KS8695"
483 select ARCH_REQUIRE_GPIOLIB
485 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
486 System-on-Chip devices.
489 bool "NetSilicon NS9xxx"
493 select GENERIC_CLOCKEVENTS
496 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
499 <http://www.digi.com/products/microprocessors/index.jsp>
502 bool "Nuvoton W90X900 CPU"
505 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
506 can login www.mcuos.com or www.nuvoton.com to know more.
509 bool "Philips Nexperia PNX4008 Mobile"
513 This enables support for Philips PNX4008 mobile platform.
516 bool "PXA2xx/PXA3xx-based"
522 select ARCH_REQUIRE_GPIOLIB
526 select GENERIC_CLOCKEVENTS
530 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
536 select GENERIC_CLOCKEVENTS
538 Support for Qualcomm MSM7K based systems. This runs on the ARM11
539 apps processor of the MSM7K and depends on a shared memory
540 interface to the ARM9 modem processor which runs the baseband stack
541 and controls some vital subsystems (clock and power control, etc).
548 select ARCH_MAY_HAVE_PC_FDC
549 select HAVE_PATA_PLATFORM
552 select ARCH_SPARSEMEM_ENABLE
554 On the Acorn Risc-PC, Linux can support the internal IDE disk and
555 CD-ROM interface, serial and parallel port, and the floppy drive.
561 select ARCH_SPARSEMEM_ENABLE
565 select GENERIC_CLOCKEVENTS
568 select ARCH_REQUIRE_GPIOLIB
570 Support for StrongARM 11x0 based boards.
573 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
577 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
578 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
579 the Samsung SMDK2410 development board (and derivatives).
582 bool "Samsung S3C64XX"
586 Samsung S3C64XX series based systems
596 Support for the StrongARM based Digital DNARD machine, also known
597 as "Shark" (<http://www.shark-linux.de/shark.html>).
602 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
603 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
605 Say Y here for systems based on one of the Sharp LH7A40X
606 System on a Chip processors. These CPUs include an ARM922T
607 core with a wide array of integrated devices for
608 hand-held and low-power applications.
614 select GENERIC_CLOCKEVENTS
616 select ARCH_REQUIRE_GPIOLIB
620 Support for TI's DaVinci platform.
626 select ARCH_REQUIRE_GPIOLIB
628 select GENERIC_CLOCKEVENTS
630 Support for TI's OMAP platform (OMAP1 and OMAP2).
634 source "arch/arm/mach-clps711x/Kconfig"
636 source "arch/arm/mach-ep93xx/Kconfig"
638 source "arch/arm/mach-footbridge/Kconfig"
640 source "arch/arm/mach-gemini/Kconfig"
642 source "arch/arm/mach-integrator/Kconfig"
644 source "arch/arm/mach-iop32x/Kconfig"
646 source "arch/arm/mach-iop33x/Kconfig"
648 source "arch/arm/mach-iop13xx/Kconfig"
650 source "arch/arm/mach-ixp4xx/Kconfig"
652 source "arch/arm/mach-ixp2000/Kconfig"
654 source "arch/arm/mach-ixp23xx/Kconfig"
656 source "arch/arm/mach-loki/Kconfig"
658 source "arch/arm/mach-mv78xx0/Kconfig"
660 source "arch/arm/mach-pxa/Kconfig"
661 source "arch/arm/plat-pxa/Kconfig"
663 source "arch/arm/mach-mmp/Kconfig"
665 source "arch/arm/mach-sa1100/Kconfig"
667 source "arch/arm/plat-omap/Kconfig"
669 source "arch/arm/mach-omap1/Kconfig"
671 source "arch/arm/mach-omap2/Kconfig"
673 source "arch/arm/mach-orion5x/Kconfig"
675 source "arch/arm/mach-kirkwood/Kconfig"
677 source "arch/arm/plat-s3c24xx/Kconfig"
678 source "arch/arm/plat-s3c64xx/Kconfig"
679 source "arch/arm/plat-s3c/Kconfig"
682 source "arch/arm/mach-s3c2400/Kconfig"
683 source "arch/arm/mach-s3c2410/Kconfig"
684 source "arch/arm/mach-s3c2412/Kconfig"
685 source "arch/arm/mach-s3c2440/Kconfig"
686 source "arch/arm/mach-s3c2442/Kconfig"
687 source "arch/arm/mach-s3c2443/Kconfig"
691 source "arch/arm/mach-s3c6400/Kconfig"
692 source "arch/arm/mach-s3c6410/Kconfig"
695 source "arch/arm/plat-stmp3xxx/Kconfig"
697 source "arch/arm/mach-lh7a40x/Kconfig"
699 source "arch/arm/mach-imx/Kconfig"
701 source "arch/arm/mach-h720x/Kconfig"
703 source "arch/arm/mach-versatile/Kconfig"
705 source "arch/arm/mach-aaec2000/Kconfig"
707 source "arch/arm/mach-realview/Kconfig"
709 source "arch/arm/mach-at91/Kconfig"
711 source "arch/arm/plat-mxc/Kconfig"
713 source "arch/arm/mach-netx/Kconfig"
715 source "arch/arm/mach-ns9xxx/Kconfig"
717 source "arch/arm/mach-davinci/Kconfig"
719 source "arch/arm/mach-ks8695/Kconfig"
721 source "arch/arm/mach-msm/Kconfig"
723 source "arch/arm/mach-w90x900/Kconfig"
725 # Definitions to make life easier
738 source arch/arm/mm/Kconfig
741 bool "Enable iWMMXt support"
742 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
743 default y if PXA27x || PXA3xx || ARCH_MMP
745 Enable support for iWMMXt context switching at run time if
746 running on a CPU that supports it.
748 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
751 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
755 source "arch/arm/Kconfig-nommu"
760 source "arch/arm/common/Kconfig"
762 config FORCE_MAX_ZONEORDER
775 Find out whether you have ISA slots on your motherboard. ISA is the
776 name of a bus system, i.e. the way the CPU talks to the other stuff
777 inside your box. Other bus systems are PCI, EISA, MicroChannel
778 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
779 newer boards don't support it. If you have ISA, say Y, otherwise N.
781 # Select ISA DMA controller support
786 # Select ISA DMA interface
791 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
793 Find out whether you have a PCI motherboard. PCI is the name of a
794 bus system, i.e. the way the CPU talks to the other stuff inside
795 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
796 VESA. If you have PCI, say Y, otherwise N.
801 # Select the host bridge type
802 config PCI_HOST_VIA82C505
804 depends on PCI && ARCH_SHARK
807 config PCI_HOST_ITE8152
809 depends on PCI && MACH_ARMCORE
813 source "drivers/pci/Kconfig"
815 source "drivers/pcmcia/Kconfig"
819 menu "Kernel Features"
821 source "kernel/time/Kconfig"
824 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
825 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
826 select USE_GENERIC_SMP_HELPERS
828 This enables support for systems with more than one CPU. If you have
829 a system with only one CPU, like most personal computers, say N. If
830 you have a system with more than one CPU, say Y.
832 If you say N here, the kernel will run on single and multiprocessor
833 machines, but will use only one CPU of a multiprocessor machine. If
834 you say Y here, the kernel will run on many, but not all, single
835 processor machines. On a single processor machine, the kernel will
836 run faster if you say N here.
838 See also <file:Documentation/i386/IO-APIC.txt>,
839 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
840 <http://www.linuxdoc.org/docs.html#howto>.
842 If you don't know what to do here, say N.
845 prompt "Memory split"
848 Select the desired split between kernel and user memory.
850 If you are not absolutely sure what you are doing, leave this
854 bool "3G/1G user/kernel split"
856 bool "2G/2G user/kernel split"
858 bool "1G/3G user/kernel split"
863 default 0x40000000 if VMSPLIT_1G
864 default 0x80000000 if VMSPLIT_2G
868 int "Maximum number of CPUs (2-32)"
874 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
875 depends on SMP && HOTPLUG && EXPERIMENTAL
877 Say Y here to experiment with turning CPUs off and on. CPUs
878 can be controlled through /sys/devices/system/cpu.
881 bool "Use local timer interrupts"
882 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
885 Enable support for local timers on SMP platforms, rather then the
886 legacy IPI broadcast method. Local timers allows the system
887 accounting to be spread across the timer interval, preventing a
888 "thundering herd" at every timer tick.
891 bool "Preemptible Kernel (EXPERIMENTAL)"
892 depends on EXPERIMENTAL
894 This option reduces the latency of the kernel when reacting to
895 real-time or interactive events by allowing a low priority process to
896 be preempted even if it is in kernel mode executing a system call.
897 This allows applications to run more reliably even when the system is
900 Say Y here if you are building a kernel for a desktop, embedded
901 or real-time system. Say N if you are unsure.
905 default 128 if ARCH_L7200
906 default 200 if ARCH_EBSA110 || ARCH_S3C2410
907 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
908 default AT91_TIMER_HZ if ARCH_AT91
912 bool "Use the ARM EABI to compile the kernel"
914 This option allows for the kernel to be compiled using the latest
915 ARM ABI (aka EABI). This is only useful if you are using a user
916 space environment that is also compiled with EABI.
918 Since there are major incompatibilities between the legacy ABI and
919 EABI, especially with regard to structure member alignment, this
920 option also changes the kernel syscall calling convention to
921 disambiguate both ABIs and allow for backward compatibility support
922 (selected with CONFIG_OABI_COMPAT).
924 To use this you need GCC version 4.0.0 or later.
927 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
928 depends on AEABI && EXPERIMENTAL
931 This option preserves the old syscall interface along with the
932 new (ARM EABI) one. It also provides a compatibility layer to
933 intercept syscalls that have structure arguments which layout
934 in memory differs between the legacy ABI and the new ARM EABI
935 (only for non "thumb" binaries). This option adds a tiny
936 overhead to all syscalls and produces a slightly larger kernel.
937 If you know you'll be using only pure EABI user space then you
938 can say N here. If this option is not selected and you attempt
939 to execute a legacy ABI binary then the result will be
940 UNPREDICTABLE (in fact it can be predicted that it won't work
941 at all). If in doubt say Y.
943 config ARCH_FLATMEM_HAS_HOLES
948 # Discontigmem is deprecated
949 config ARCH_DISCONTIGMEM_ENABLE
952 config ARCH_SPARSEMEM_ENABLE
955 config ARCH_SPARSEMEM_DEFAULT
956 def_bool ARCH_SPARSEMEM_ENABLE
958 config ARCH_SELECT_MEMORY_MODEL
959 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
963 default "4" if ARCH_LH7A40X
965 depends on NEED_MULTIPLE_NODES
968 bool "High Memory Support (EXPERIMENTAL)"
969 depends on MMU && EXPERIMENTAL
971 The address space of ARM processors is only 4 Gigabytes large
972 and it has to accommodate user address space, kernel address
973 space as well as some memory mapped IO. That means that, if you
974 have a large amount of physical memory and/or IO, not all of the
975 memory can be "permanently mapped" by the kernel. The physical
976 memory that is not permanently mapped is called "high memory".
978 Depending on the selected kernel/user memory split, minimum
979 vmalloc space and actual amount of RAM, you may not need this
980 option which should result in a slightly faster kernel.
987 bool "Timer and CPU usage LEDs"
988 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
989 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
990 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
991 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
992 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
993 ARCH_AT91 || ARCH_DAVINCI || \
994 ARCH_KS8695 || MACH_RD88F5182
996 If you say Y here, the LEDs on your machine will be used
997 to provide useful information about your current system status.
999 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1000 be able to select which LEDs are active using the options below. If
1001 you are compiling a kernel for the EBSA-110 or the LART however, the
1002 red LED will simply flash regularly to indicate that the system is
1003 still functional. It is safe to say Y here if you have a CATS
1004 system, but the driver will do nothing.
1007 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1008 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1009 || MACH_OMAP_PERSEUS2
1011 depends on !GENERIC_CLOCKEVENTS
1012 default y if ARCH_EBSA110
1014 If you say Y here, one of the system LEDs (the green one on the
1015 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1016 will flash regularly to indicate that the system is still
1017 operational. This is mainly useful to kernel hackers who are
1018 debugging unstable kernels.
1020 The LART uses the same LED for both Timer LED and CPU usage LED
1021 functions. You may choose to use both, but the Timer LED function
1022 will overrule the CPU usage LED.
1025 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1027 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1028 || MACH_OMAP_PERSEUS2
1031 If you say Y here, the red LED will be used to give a good real
1032 time indication of CPU usage, by lighting whenever the idle task
1033 is not currently executing.
1035 The LART uses the same LED for both Timer LED and CPU usage LED
1036 functions. You may choose to use both, but the Timer LED function
1037 will overrule the CPU usage LED.
1039 config ALIGNMENT_TRAP
1041 depends on CPU_CP15_MMU
1042 default y if !ARCH_EBSA110
1044 ARM processors cannot fetch/store information which is not
1045 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1046 address divisible by 4. On 32-bit ARM processors, these non-aligned
1047 fetch/store instructions will be emulated in software if you say
1048 here, which has a severe performance impact. This is necessary for
1049 correct operation of some network protocols. With an IP-only
1050 configuration it is safe to say N, otherwise say Y.
1056 # Compressed boot loader in ROM. Yes, we really want to ask about
1057 # TEXT and BSS so we preserve their values in the config files.
1058 config ZBOOT_ROM_TEXT
1059 hex "Compressed ROM boot loader base address"
1062 The physical address at which the ROM-able zImage is to be
1063 placed in the target. Platforms which normally make use of
1064 ROM-able zImage formats normally set this to a suitable
1065 value in their defconfig file.
1067 If ZBOOT_ROM is not enabled, this has no effect.
1069 config ZBOOT_ROM_BSS
1070 hex "Compressed ROM boot loader BSS address"
1073 The base address of an area of read/write memory in the target
1074 for the ROM-able zImage which must be available while the
1075 decompressor is running. It must be large enough to hold the
1076 entire decompressed kernel plus an additional 128 KiB.
1077 Platforms which normally make use of ROM-able zImage formats
1078 normally set this to a suitable value in their defconfig file.
1080 If ZBOOT_ROM is not enabled, this has no effect.
1083 bool "Compressed boot loader in ROM/flash"
1084 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1086 Say Y here if you intend to execute your compressed kernel image
1087 (zImage) directly from ROM or flash. If unsure, say N.
1090 string "Default kernel command string"
1093 On some architectures (EBSA110 and CATS), there is currently no way
1094 for the boot loader to pass arguments to the kernel. For these
1095 architectures, you should supply some command-line options at build
1096 time by entering them here. As a minimum, you should specify the
1097 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1100 bool "Kernel Execute-In-Place from ROM"
1101 depends on !ZBOOT_ROM
1103 Execute-In-Place allows the kernel to run from non-volatile storage
1104 directly addressable by the CPU, such as NOR flash. This saves RAM
1105 space since the text section of the kernel is not loaded from flash
1106 to RAM. Read-write sections, such as the data section and stack,
1107 are still copied to RAM. The XIP kernel is not compressed since
1108 it has to run directly from flash, so it will take more space to
1109 store it. The flash address used to link the kernel object files,
1110 and for storing it, is configuration dependent. Therefore, if you
1111 say Y here, you must know the proper physical address where to
1112 store the kernel image depending on your own flash memory usage.
1114 Also note that the make target becomes "make xipImage" rather than
1115 "make zImage" or "make Image". The final kernel binary to put in
1116 ROM memory will be arch/arm/boot/xipImage.
1120 config XIP_PHYS_ADDR
1121 hex "XIP Kernel Physical Location"
1122 depends on XIP_KERNEL
1123 default "0x00080000"
1125 This is the physical address in your flash memory the kernel will
1126 be linked for and stored to. This address is dependent on your
1130 bool "Kexec system call (EXPERIMENTAL)"
1131 depends on EXPERIMENTAL
1133 kexec is a system call that implements the ability to shutdown your
1134 current kernel, and to start another kernel. It is like a reboot
1135 but it is independent of the system firmware. And like a reboot
1136 you can start any kernel with it, not just Linux.
1138 It is an ongoing process to be certain the hardware in a machine
1139 is properly shutdown, so do not be surprised if this code does not
1140 initially work for you. It may help to enable device hotplugging
1144 bool "Export atags in procfs"
1148 Should the atags used to boot the kernel be exported in an "atags"
1149 file in procfs. Useful with kexec.
1153 menu "CPU Power Management"
1155 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1157 source "drivers/cpufreq/Kconfig"
1159 config CPU_FREQ_SA1100
1161 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1164 config CPU_FREQ_SA1110
1166 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1169 config CPU_FREQ_INTEGRATOR
1170 tristate "CPUfreq driver for ARM Integrator CPUs"
1171 depends on ARCH_INTEGRATOR && CPU_FREQ
1174 This enables the CPUfreq driver for ARM Integrator CPUs.
1176 For details, take a look at <file:Documentation/cpu-freq>.
1181 tristate "CPUfreq driver for i.MX CPUs"
1182 depends on ARCH_IMX && CPU_FREQ
1185 This enables the CPUfreq driver for i.MX CPUs.
1191 depends on CPU_FREQ && ARCH_PXA && PXA25x
1193 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1197 source "drivers/cpuidle/Kconfig"
1201 menu "Floating point emulation"
1203 comment "At least one emulation must be selected"
1206 bool "NWFPE math emulation"
1207 depends on !AEABI || OABI_COMPAT
1209 Say Y to include the NWFPE floating point emulator in the kernel.
1210 This is necessary to run most binaries. Linux does not currently
1211 support floating point hardware so you need to say Y here even if
1212 your machine has an FPA or floating point co-processor podule.
1214 You may say N here if you are going to load the Acorn FPEmulator
1215 early in the bootup.
1218 bool "Support extended precision"
1219 depends on FPE_NWFPE
1221 Say Y to include 80-bit support in the kernel floating-point
1222 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1223 Note that gcc does not generate 80-bit operations by default,
1224 so in most cases this option only enlarges the size of the
1225 floating point emulator without any good reason.
1227 You almost surely want to say N here.
1230 bool "FastFPE math emulation (EXPERIMENTAL)"
1231 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1233 Say Y here to include the FAST floating point emulator in the kernel.
1234 This is an experimental much faster emulator which now also has full
1235 precision for the mantissa. It does not support any exceptions.
1236 It is very simple, and approximately 3-6 times faster than NWFPE.
1238 It should be sufficient for most programs. It may be not suitable
1239 for scientific calculations, but you have to check this for yourself.
1240 If you do not feel you need a faster FP emulation you should better
1244 bool "VFP-format floating point maths"
1245 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1247 Say Y to include VFP support code in the kernel. This is needed
1248 if your hardware includes a VFP unit.
1250 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1251 release notes and additional status information.
1253 Say N if your target does not have VFP hardware.
1261 bool "Advanced SIMD (NEON) Extension support"
1262 depends on VFPv3 && CPU_V7
1264 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1269 menu "Userspace binary formats"
1271 source "fs/Kconfig.binfmt"
1274 tristate "RISC OS personality"
1277 Say Y here to include the kernel code necessary if you want to run
1278 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1279 experimental; if this sounds frightening, say N and sleep in peace.
1280 You can also say M here to compile this support as a module (which
1281 will be called arthur).
1285 menu "Power management options"
1287 source "kernel/power/Kconfig"
1289 config ARCH_SUSPEND_POSSIBLE
1294 source "net/Kconfig"
1296 menu "Device Drivers"
1298 source "drivers/base/Kconfig"
1300 source "drivers/connector/Kconfig"
1302 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1303 source "drivers/mtd/Kconfig"
1306 source "drivers/parport/Kconfig"
1308 source "drivers/pnp/Kconfig"
1310 source "drivers/block/Kconfig"
1312 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1314 source "drivers/misc/Kconfig"
1316 source "drivers/ide/Kconfig"
1318 source "drivers/scsi/Kconfig"
1320 source "drivers/ata/Kconfig"
1322 source "drivers/md/Kconfig"
1324 source "drivers/message/fusion/Kconfig"
1326 source "drivers/ieee1394/Kconfig"
1328 source "drivers/message/i2o/Kconfig"
1330 source "drivers/net/Kconfig"
1332 source "drivers/isdn/Kconfig"
1334 # input before char - char/joystick depends on it. As does USB.
1336 source "drivers/input/Kconfig"
1338 source "drivers/char/Kconfig"
1340 source "drivers/i2c/Kconfig"
1342 source "drivers/spi/Kconfig"
1344 source "drivers/gpio/Kconfig"
1346 source "drivers/w1/Kconfig"
1348 source "drivers/power/Kconfig"
1350 source "drivers/hwmon/Kconfig"
1352 source "drivers/thermal/Kconfig"
1354 source "drivers/watchdog/Kconfig"
1356 source "drivers/ssb/Kconfig"
1358 #source "drivers/l3/Kconfig"
1360 source "drivers/mfd/Kconfig"
1362 source "drivers/media/Kconfig"
1364 source "drivers/video/Kconfig"
1366 source "sound/Kconfig"
1368 source "drivers/hid/Kconfig"
1370 source "drivers/usb/Kconfig"
1372 source "drivers/uwb/Kconfig"
1374 source "drivers/mmc/Kconfig"
1376 source "drivers/memstick/Kconfig"
1378 source "drivers/accessibility/Kconfig"
1380 source "drivers/leds/Kconfig"
1382 source "drivers/rtc/Kconfig"
1384 source "drivers/dma/Kconfig"
1386 source "drivers/dca/Kconfig"
1388 source "drivers/auxdisplay/Kconfig"
1390 source "drivers/regulator/Kconfig"
1392 source "drivers/uio/Kconfig"
1394 source "drivers/staging/Kconfig"
1400 source "arch/arm/Kconfig.debug"
1402 source "security/Kconfig"
1404 source "crypto/Kconfig"
1406 source "lib/Kconfig"