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.
262 This is an evaluation board for the StrongARM processor available
263 from Digital. It has limited hardware on-board, including an
264 Ethernet interface, two PCMCIA sockets, two serial ports and a
275 select ARCH_REQUIRE_GPIOLIB
277 This enables support for the Cirrus EP93xx series of CPUs.
279 config ARCH_FOOTBRIDGE
284 Support for systems based on the DC21285 companion chip
285 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
288 bool "Hilscher NetX based"
291 select GENERIC_CLOCKEVENTS
294 This enables support for systems based on the Hilscher NetX Soc
297 bool "Hynix HMS720x-based"
301 This enables support for systems based on the Hynix HMS720x
308 select GENERIC_CLOCKEVENTS
310 Support for Motorola's i.MX family of processors (MX1, MXL).
318 select ARCH_SUPPORTS_MSI
321 Support for Intel's IOP13XX (XScale) family of processors.
330 select ARCH_REQUIRE_GPIOLIB
332 Support for Intel's 80219 and IOP32X (XScale) family of
342 select ARCH_REQUIRE_GPIOLIB
344 Support for Intel's IOP33X (XScale) family of processors.
352 Support for Intel's IXP23xx (XScale) family of processors.
355 bool "IXP2400/2800-based"
360 Support for Intel's IXP2400/2800 (XScale) family of processors.
368 select GENERIC_CLOCKEVENTS
369 select DMABOUNCE if PCI
371 Support for Intel's IXP4XX (XScale) family of processors.
378 Say Y here if you intend to run this kernel on a LinkUp Systems
379 L7200 Software Development Board which uses an ARM720T processor.
380 Information on this board can be obtained at:
382 <http://www.linkupsys.com/>
384 If you have any questions or comments about the Linux kernel port
385 to this board, send e-mail to <sjhill@cotw.com>.
388 bool "Marvell Kirkwood"
393 select GENERIC_CLOCKEVENTS
396 Support for the following Marvell Kirkwood series SoCs:
397 88F6180, 88F6192 and 88F6281.
400 bool "Micrel/Kendin KS8695"
403 select ARCH_REQUIRE_GPIOLIB
405 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
406 System-on-Chip devices.
409 bool "NetSilicon NS9xxx"
413 select GENERIC_CLOCKEVENTS
416 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
419 <http://www.digi.com/products/microprocessors/index.jsp>
422 bool "Marvell Loki (88RC8480)"
425 select GENERIC_CLOCKEVENTS
428 Support for the Marvell Loki (88RC8480) SoC.
431 bool "Marvell MV78xx0"
436 select GENERIC_CLOCKEVENTS
439 Support for the following Marvell MV78xx0 series SoCs:
443 bool "Freescale MXC/iMX-based"
445 select GENERIC_CLOCKEVENTS
448 select ARCH_REQUIRE_GPIOLIB
450 Support for Freescale MXC/iMX-based family of processors
459 select GENERIC_CLOCKEVENTS
462 Support for the following Marvell Orion 5x series SoCs:
463 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
464 Orion-2 (5281), Orion-1-90 (6183).
467 bool "Philips Nexperia PNX4008 Mobile"
471 This enables support for Philips PNX4008 mobile platform.
474 bool "PXA2xx/PXA3xx-based"
480 select ARCH_REQUIRE_GPIOLIB
484 select GENERIC_CLOCKEVENTS
488 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
491 bool "Marvell PXA168/910"
494 select ARCH_REQUIRE_GPIOLIB
498 select GENERIC_CLOCKEVENTS
502 Support for Marvell's PXA168/910 processor line.
509 select ARCH_MAY_HAVE_PC_FDC
510 select HAVE_PATA_PLATFORM
513 select ARCH_SPARSEMEM_ENABLE
515 On the Acorn Risc-PC, Linux can support the internal IDE disk and
516 CD-ROM interface, serial and parallel port, and the floppy drive.
522 select ARCH_SPARSEMEM_ENABLE
526 select GENERIC_CLOCKEVENTS
529 select ARCH_REQUIRE_GPIOLIB
531 Support for StrongARM 11x0 based boards.
534 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
538 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
539 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
540 the Samsung SMDK2410 development board (and derivatives).
543 bool "Samsung S3C64XX"
547 Samsung S3C64XX series based systems
557 Support for the StrongARM based Digital DNARD machine, also known
558 as "Shark" (<http://www.shark-linux.de/shark.html>).
563 select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
564 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
566 Say Y here for systems based on one of the Sharp LH7A40X
567 System on a Chip processors. These CPUs include an ARM922T
568 core with a wide array of integrated devices for
569 hand-held and low-power applications.
575 select GENERIC_CLOCKEVENTS
577 select ARCH_REQUIRE_GPIOLIB
581 Support for TI's DaVinci platform.
587 select ARCH_REQUIRE_GPIOLIB
589 select GENERIC_CLOCKEVENTS
591 Support for TI's OMAP platform (OMAP1 and OMAP2).
597 select GENERIC_CLOCKEVENTS
599 Support for Qualcomm MSM7K based systems. This runs on the ARM11
600 apps processor of the MSM7K and depends on a shared memory
601 interface to the ARM9 modem processor which runs the baseband stack
602 and controls some vital subsystems (clock and power control, etc).
605 bool "Nuvoton W90X900 CPU"
608 Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
609 can login www.mcuos.com or www.nuvoton.com to know more.
613 source "arch/arm/mach-clps711x/Kconfig"
615 source "arch/arm/mach-ep93xx/Kconfig"
617 source "arch/arm/mach-footbridge/Kconfig"
619 source "arch/arm/mach-integrator/Kconfig"
621 source "arch/arm/mach-iop32x/Kconfig"
623 source "arch/arm/mach-iop33x/Kconfig"
625 source "arch/arm/mach-iop13xx/Kconfig"
627 source "arch/arm/mach-ixp4xx/Kconfig"
629 source "arch/arm/mach-ixp2000/Kconfig"
631 source "arch/arm/mach-ixp23xx/Kconfig"
633 source "arch/arm/mach-loki/Kconfig"
635 source "arch/arm/mach-mv78xx0/Kconfig"
637 source "arch/arm/mach-pxa/Kconfig"
638 source "arch/arm/plat-pxa/Kconfig"
640 source "arch/arm/mach-mmp/Kconfig"
642 source "arch/arm/mach-sa1100/Kconfig"
644 source "arch/arm/plat-omap/Kconfig"
646 source "arch/arm/mach-omap1/Kconfig"
648 source "arch/arm/mach-omap2/Kconfig"
650 source "arch/arm/mach-orion5x/Kconfig"
652 source "arch/arm/mach-kirkwood/Kconfig"
654 source "arch/arm/plat-s3c24xx/Kconfig"
655 source "arch/arm/plat-s3c64xx/Kconfig"
656 source "arch/arm/plat-s3c/Kconfig"
659 source "arch/arm/mach-s3c2400/Kconfig"
660 source "arch/arm/mach-s3c2410/Kconfig"
661 source "arch/arm/mach-s3c2412/Kconfig"
662 source "arch/arm/mach-s3c2440/Kconfig"
663 source "arch/arm/mach-s3c2442/Kconfig"
664 source "arch/arm/mach-s3c2443/Kconfig"
668 source "arch/arm/mach-s3c6400/Kconfig"
669 source "arch/arm/mach-s3c6410/Kconfig"
672 source "arch/arm/mach-lh7a40x/Kconfig"
674 source "arch/arm/mach-imx/Kconfig"
676 source "arch/arm/mach-h720x/Kconfig"
678 source "arch/arm/mach-versatile/Kconfig"
680 source "arch/arm/mach-aaec2000/Kconfig"
682 source "arch/arm/mach-realview/Kconfig"
684 source "arch/arm/mach-at91/Kconfig"
686 source "arch/arm/plat-mxc/Kconfig"
688 source "arch/arm/mach-netx/Kconfig"
690 source "arch/arm/mach-ns9xxx/Kconfig"
692 source "arch/arm/mach-davinci/Kconfig"
694 source "arch/arm/mach-ks8695/Kconfig"
696 source "arch/arm/mach-msm/Kconfig"
698 source "arch/arm/mach-w90x900/Kconfig"
700 # Definitions to make life easier
713 source arch/arm/mm/Kconfig
716 bool "Enable iWMMXt support"
717 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
718 default y if PXA27x || PXA3xx || ARCH_MMP
720 Enable support for iWMMXt context switching at run time if
721 running on a CPU that supports it.
723 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
726 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
730 source "arch/arm/Kconfig-nommu"
735 source "arch/arm/common/Kconfig"
737 config FORCE_MAX_ZONEORDER
750 Find out whether you have ISA slots on your motherboard. ISA is the
751 name of a bus system, i.e. the way the CPU talks to the other stuff
752 inside your box. Other bus systems are PCI, EISA, MicroChannel
753 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
754 newer boards don't support it. If you have ISA, say Y, otherwise N.
756 # Select ISA DMA controller support
761 # Select ISA DMA interface
766 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
768 Find out whether you have a PCI motherboard. PCI is the name of a
769 bus system, i.e. the way the CPU talks to the other stuff inside
770 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
771 VESA. If you have PCI, say Y, otherwise N.
776 # Select the host bridge type
777 config PCI_HOST_VIA82C505
779 depends on PCI && ARCH_SHARK
782 config PCI_HOST_ITE8152
784 depends on PCI && MACH_ARMCORE
788 source "drivers/pci/Kconfig"
790 source "drivers/pcmcia/Kconfig"
794 menu "Kernel Features"
796 source "kernel/time/Kconfig"
799 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
800 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
801 select USE_GENERIC_SMP_HELPERS
803 This enables support for systems with more than one CPU. If you have
804 a system with only one CPU, like most personal computers, say N. If
805 you have a system with more than one CPU, say Y.
807 If you say N here, the kernel will run on single and multiprocessor
808 machines, but will use only one CPU of a multiprocessor machine. If
809 you say Y here, the kernel will run on many, but not all, single
810 processor machines. On a single processor machine, the kernel will
811 run faster if you say N here.
813 See also <file:Documentation/i386/IO-APIC.txt>,
814 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
815 <http://www.linuxdoc.org/docs.html#howto>.
817 If you don't know what to do here, say N.
820 prompt "Memory split"
823 Select the desired split between kernel and user memory.
825 If you are not absolutely sure what you are doing, leave this
829 bool "3G/1G user/kernel split"
831 bool "2G/2G user/kernel split"
833 bool "1G/3G user/kernel split"
838 default 0x40000000 if VMSPLIT_1G
839 default 0x80000000 if VMSPLIT_2G
843 int "Maximum number of CPUs (2-32)"
849 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
850 depends on SMP && HOTPLUG && EXPERIMENTAL
852 Say Y here to experiment with turning CPUs off and on. CPUs
853 can be controlled through /sys/devices/system/cpu.
856 bool "Use local timer interrupts"
857 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || REALVIEW_EB_A9MP)
860 Enable support for local timers on SMP platforms, rather then the
861 legacy IPI broadcast method. Local timers allows the system
862 accounting to be spread across the timer interval, preventing a
863 "thundering herd" at every timer tick.
866 bool "Preemptible Kernel (EXPERIMENTAL)"
867 depends on EXPERIMENTAL
869 This option reduces the latency of the kernel when reacting to
870 real-time or interactive events by allowing a low priority process to
871 be preempted even if it is in kernel mode executing a system call.
872 This allows applications to run more reliably even when the system is
875 Say Y here if you are building a kernel for a desktop, embedded
876 or real-time system. Say N if you are unsure.
880 default 128 if ARCH_L7200
881 default 200 if ARCH_EBSA110 || ARCH_S3C2410
882 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
883 default AT91_TIMER_HZ if ARCH_AT91
887 bool "Use the ARM EABI to compile the kernel"
889 This option allows for the kernel to be compiled using the latest
890 ARM ABI (aka EABI). This is only useful if you are using a user
891 space environment that is also compiled with EABI.
893 Since there are major incompatibilities between the legacy ABI and
894 EABI, especially with regard to structure member alignment, this
895 option also changes the kernel syscall calling convention to
896 disambiguate both ABIs and allow for backward compatibility support
897 (selected with CONFIG_OABI_COMPAT).
899 To use this you need GCC version 4.0.0 or later.
902 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
903 depends on AEABI && EXPERIMENTAL
906 This option preserves the old syscall interface along with the
907 new (ARM EABI) one. It also provides a compatibility layer to
908 intercept syscalls that have structure arguments which layout
909 in memory differs between the legacy ABI and the new ARM EABI
910 (only for non "thumb" binaries). This option adds a tiny
911 overhead to all syscalls and produces a slightly larger kernel.
912 If you know you'll be using only pure EABI user space then you
913 can say N here. If this option is not selected and you attempt
914 to execute a legacy ABI binary then the result will be
915 UNPREDICTABLE (in fact it can be predicted that it won't work
916 at all). If in doubt say Y.
918 config ARCH_FLATMEM_HAS_HOLES
923 # Discontigmem is deprecated
924 config ARCH_DISCONTIGMEM_ENABLE
927 config ARCH_SPARSEMEM_ENABLE
930 config ARCH_SPARSEMEM_DEFAULT
931 def_bool ARCH_SPARSEMEM_ENABLE
933 config ARCH_SELECT_MEMORY_MODEL
934 def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
938 default "4" if ARCH_LH7A40X
940 depends on NEED_MULTIPLE_NODES
943 bool "High Memory Support (EXPERIMENTAL)"
944 depends on MMU && EXPERIMENTAL
946 The address space of ARM processors is only 4 Gigabytes large
947 and it has to accommodate user address space, kernel address
948 space as well as some memory mapped IO. That means that, if you
949 have a large amount of physical memory and/or IO, not all of the
950 memory can be "permanently mapped" by the kernel. The physical
951 memory that is not permanently mapped is called "high memory".
953 Depending on the selected kernel/user memory split, minimum
954 vmalloc space and actual amount of RAM, you may not need this
955 option which should result in a slightly faster kernel.
962 bool "Timer and CPU usage LEDs"
963 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
964 ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
965 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
966 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
967 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
968 ARCH_AT91 || ARCH_DAVINCI || \
969 ARCH_KS8695 || MACH_RD88F5182
971 If you say Y here, the LEDs on your machine will be used
972 to provide useful information about your current system status.
974 If you are compiling a kernel for a NetWinder or EBSA-285, you will
975 be able to select which LEDs are active using the options below. If
976 you are compiling a kernel for the EBSA-110 or the LART however, the
977 red LED will simply flash regularly to indicate that the system is
978 still functional. It is safe to say Y here if you have a CATS
979 system, but the driver will do nothing.
982 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
983 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
984 || MACH_OMAP_PERSEUS2
986 depends on !GENERIC_CLOCKEVENTS
987 default y if ARCH_EBSA110
989 If you say Y here, one of the system LEDs (the green one on the
990 NetWinder, the amber one on the EBSA285, or the red one on the LART)
991 will flash regularly to indicate that the system is still
992 operational. This is mainly useful to kernel hackers who are
993 debugging unstable kernels.
995 The LART uses the same LED for both Timer LED and CPU usage LED
996 functions. You may choose to use both, but the Timer LED function
997 will overrule the CPU usage LED.
1000 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1002 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1003 || MACH_OMAP_PERSEUS2
1006 If you say Y here, the red LED will be used to give a good real
1007 time indication of CPU usage, by lighting whenever the idle task
1008 is not currently executing.
1010 The LART uses the same LED for both Timer LED and CPU usage LED
1011 functions. You may choose to use both, but the Timer LED function
1012 will overrule the CPU usage LED.
1014 config ALIGNMENT_TRAP
1016 depends on CPU_CP15_MMU
1017 default y if !ARCH_EBSA110
1019 ARM processors cannot fetch/store information which is not
1020 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1021 address divisible by 4. On 32-bit ARM processors, these non-aligned
1022 fetch/store instructions will be emulated in software if you say
1023 here, which has a severe performance impact. This is necessary for
1024 correct operation of some network protocols. With an IP-only
1025 configuration it is safe to say N, otherwise say Y.
1031 # Compressed boot loader in ROM. Yes, we really want to ask about
1032 # TEXT and BSS so we preserve their values in the config files.
1033 config ZBOOT_ROM_TEXT
1034 hex "Compressed ROM boot loader base address"
1037 The physical address at which the ROM-able zImage is to be
1038 placed in the target. Platforms which normally make use of
1039 ROM-able zImage formats normally set this to a suitable
1040 value in their defconfig file.
1042 If ZBOOT_ROM is not enabled, this has no effect.
1044 config ZBOOT_ROM_BSS
1045 hex "Compressed ROM boot loader BSS address"
1048 The base address of an area of read/write memory in the target
1049 for the ROM-able zImage which must be available while the
1050 decompressor is running. It must be large enough to hold the
1051 entire decompressed kernel plus an additional 128 KiB.
1052 Platforms which normally make use of ROM-able zImage formats
1053 normally set this to a suitable value in their defconfig file.
1055 If ZBOOT_ROM is not enabled, this has no effect.
1058 bool "Compressed boot loader in ROM/flash"
1059 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1061 Say Y here if you intend to execute your compressed kernel image
1062 (zImage) directly from ROM or flash. If unsure, say N.
1065 string "Default kernel command string"
1068 On some architectures (EBSA110 and CATS), there is currently no way
1069 for the boot loader to pass arguments to the kernel. For these
1070 architectures, you should supply some command-line options at build
1071 time by entering them here. As a minimum, you should specify the
1072 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1075 bool "Kernel Execute-In-Place from ROM"
1076 depends on !ZBOOT_ROM
1078 Execute-In-Place allows the kernel to run from non-volatile storage
1079 directly addressable by the CPU, such as NOR flash. This saves RAM
1080 space since the text section of the kernel is not loaded from flash
1081 to RAM. Read-write sections, such as the data section and stack,
1082 are still copied to RAM. The XIP kernel is not compressed since
1083 it has to run directly from flash, so it will take more space to
1084 store it. The flash address used to link the kernel object files,
1085 and for storing it, is configuration dependent. Therefore, if you
1086 say Y here, you must know the proper physical address where to
1087 store the kernel image depending on your own flash memory usage.
1089 Also note that the make target becomes "make xipImage" rather than
1090 "make zImage" or "make Image". The final kernel binary to put in
1091 ROM memory will be arch/arm/boot/xipImage.
1095 config XIP_PHYS_ADDR
1096 hex "XIP Kernel Physical Location"
1097 depends on XIP_KERNEL
1098 default "0x00080000"
1100 This is the physical address in your flash memory the kernel will
1101 be linked for and stored to. This address is dependent on your
1105 bool "Kexec system call (EXPERIMENTAL)"
1106 depends on EXPERIMENTAL
1108 kexec is a system call that implements the ability to shutdown your
1109 current kernel, and to start another kernel. It is like a reboot
1110 but it is independent of the system firmware. And like a reboot
1111 you can start any kernel with it, not just Linux.
1113 It is an ongoing process to be certain the hardware in a machine
1114 is properly shutdown, so do not be surprised if this code does not
1115 initially work for you. It may help to enable device hotplugging
1119 bool "Export atags in procfs"
1123 Should the atags used to boot the kernel be exported in an "atags"
1124 file in procfs. Useful with kexec.
1128 menu "CPU Power Management"
1130 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
1132 source "drivers/cpufreq/Kconfig"
1134 config CPU_FREQ_SA1100
1136 depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
1139 config CPU_FREQ_SA1110
1141 depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
1144 config CPU_FREQ_INTEGRATOR
1145 tristate "CPUfreq driver for ARM Integrator CPUs"
1146 depends on ARCH_INTEGRATOR && CPU_FREQ
1149 This enables the CPUfreq driver for ARM Integrator CPUs.
1151 For details, take a look at <file:Documentation/cpu-freq>.
1156 tristate "CPUfreq driver for i.MX CPUs"
1157 depends on ARCH_IMX && CPU_FREQ
1160 This enables the CPUfreq driver for i.MX CPUs.
1166 depends on CPU_FREQ && ARCH_PXA && PXA25x
1168 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1172 source "drivers/cpuidle/Kconfig"
1176 menu "Floating point emulation"
1178 comment "At least one emulation must be selected"
1181 bool "NWFPE math emulation"
1182 depends on !AEABI || OABI_COMPAT
1184 Say Y to include the NWFPE floating point emulator in the kernel.
1185 This is necessary to run most binaries. Linux does not currently
1186 support floating point hardware so you need to say Y here even if
1187 your machine has an FPA or floating point co-processor podule.
1189 You may say N here if you are going to load the Acorn FPEmulator
1190 early in the bootup.
1193 bool "Support extended precision"
1194 depends on FPE_NWFPE
1196 Say Y to include 80-bit support in the kernel floating-point
1197 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1198 Note that gcc does not generate 80-bit operations by default,
1199 so in most cases this option only enlarges the size of the
1200 floating point emulator without any good reason.
1202 You almost surely want to say N here.
1205 bool "FastFPE math emulation (EXPERIMENTAL)"
1206 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1208 Say Y here to include the FAST floating point emulator in the kernel.
1209 This is an experimental much faster emulator which now also has full
1210 precision for the mantissa. It does not support any exceptions.
1211 It is very simple, and approximately 3-6 times faster than NWFPE.
1213 It should be sufficient for most programs. It may be not suitable
1214 for scientific calculations, but you have to check this for yourself.
1215 If you do not feel you need a faster FP emulation you should better
1219 bool "VFP-format floating point maths"
1220 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1222 Say Y to include VFP support code in the kernel. This is needed
1223 if your hardware includes a VFP unit.
1225 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1226 release notes and additional status information.
1228 Say N if your target does not have VFP hardware.
1236 bool "Advanced SIMD (NEON) Extension support"
1237 depends on VFPv3 && CPU_V7
1239 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1244 menu "Userspace binary formats"
1246 source "fs/Kconfig.binfmt"
1249 tristate "RISC OS personality"
1252 Say Y here to include the kernel code necessary if you want to run
1253 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1254 experimental; if this sounds frightening, say N and sleep in peace.
1255 You can also say M here to compile this support as a module (which
1256 will be called arthur).
1260 menu "Power management options"
1262 source "kernel/power/Kconfig"
1264 config ARCH_SUSPEND_POSSIBLE
1269 source "net/Kconfig"
1271 menu "Device Drivers"
1273 source "drivers/base/Kconfig"
1275 source "drivers/connector/Kconfig"
1277 if ALIGNMENT_TRAP || !CPU_CP15_MMU
1278 source "drivers/mtd/Kconfig"
1281 source "drivers/parport/Kconfig"
1283 source "drivers/pnp/Kconfig"
1285 source "drivers/block/Kconfig"
1287 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
1289 source "drivers/misc/Kconfig"
1291 source "drivers/ide/Kconfig"
1293 source "drivers/scsi/Kconfig"
1295 source "drivers/ata/Kconfig"
1297 source "drivers/md/Kconfig"
1299 source "drivers/message/fusion/Kconfig"
1301 source "drivers/ieee1394/Kconfig"
1303 source "drivers/message/i2o/Kconfig"
1305 source "drivers/net/Kconfig"
1307 source "drivers/isdn/Kconfig"
1309 # input before char - char/joystick depends on it. As does USB.
1311 source "drivers/input/Kconfig"
1313 source "drivers/char/Kconfig"
1315 source "drivers/i2c/Kconfig"
1317 source "drivers/spi/Kconfig"
1319 source "drivers/gpio/Kconfig"
1321 source "drivers/w1/Kconfig"
1323 source "drivers/power/Kconfig"
1325 source "drivers/hwmon/Kconfig"
1327 source "drivers/thermal/Kconfig"
1329 source "drivers/watchdog/Kconfig"
1331 source "drivers/ssb/Kconfig"
1333 #source "drivers/l3/Kconfig"
1335 source "drivers/mfd/Kconfig"
1337 source "drivers/media/Kconfig"
1339 source "drivers/video/Kconfig"
1341 source "sound/Kconfig"
1343 source "drivers/hid/Kconfig"
1345 source "drivers/usb/Kconfig"
1347 source "drivers/uwb/Kconfig"
1349 source "drivers/mmc/Kconfig"
1351 source "drivers/memstick/Kconfig"
1353 source "drivers/accessibility/Kconfig"
1355 source "drivers/leds/Kconfig"
1357 source "drivers/rtc/Kconfig"
1359 source "drivers/dma/Kconfig"
1361 source "drivers/dca/Kconfig"
1363 source "drivers/auxdisplay/Kconfig"
1365 source "drivers/regulator/Kconfig"
1367 source "drivers/uio/Kconfig"
1369 source "drivers/staging/Kconfig"
1375 source "arch/arm/Kconfig.debug"
1377 source "security/Kconfig"
1379 source "crypto/Kconfig"
1381 source "lib/Kconfig"