arch/arm/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 mainmenu "Linux Kernel Configuration"
   7
   8 config ARM
   9         bool
  10         default y
  11         help
  12           The ARM series is a line of low-power-consumption RISC chip designs
  13           licensed by ARM Ltd and targeted at embedded applications and
  14           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  15           manufactured, but legacy ARM-based PC hardware remains popular in
  16           Europe.  There is an ARM Linux project with a web page at
  17           <http://www.arm.linux.org.uk/>.
  18
  19 config MMU
  20         bool
  21         default y
  22
  23 config EISA
  24         bool
  25         ---help---
  26           The Extended Industry Standard Architecture (EISA) bus was
  27           developed as an open alternative to the IBM MicroChannel bus.
  28
  29           The EISA bus provided some of the features of the IBM MicroChannel
  30           bus while maintaining backward compatibility with cards made for
  31           the older ISA bus.  The EISA bus saw limited use between 1988 and
  32           1995 when it was made obsolete by the PCI bus.
  33
  34           Say Y here if you are building a kernel for an EISA-based machine.
  35
  36           Otherwise, say N.
  37
  38 config SBUS
  39         bool
  40
  41 config MCA
  42         bool
  43         help
  44           MicroChannel Architecture is found in some IBM PS/2 machines and
  45           laptops.  It is a bus system similar to PCI or ISA. See
  46           <file:Documentation/mca.txt> (and especially the web page given
  47           there) before attempting to build an MCA bus kernel.
  48
  49 config RWSEM_GENERIC_SPINLOCK
  50         bool
  51         default y
  52
  53 config RWSEM_XCHGADD_ALGORITHM
  54         bool
  55
  56 config GENERIC_CALIBRATE_DELAY
  57         bool
  58         default y
  59
  60 config GENERIC_BUST_SPINLOCK
  61         bool
  62
  63 config ARCH_MAY_HAVE_PC_FDC
  64         bool
  65
  66 config GENERIC_ISA_DMA
  67         bool
  68
  69 config FIQ
  70         bool
  71
  72 config ARCH_MTD_XIP
  73         bool
  74
  75 source "init/Kconfig"
  76
  77 menu "System Type"
  78
  79 choice
  80         prompt "ARM system type"
  81         default ARCH_VERSATILE
  82
  83 config ARCH_CLPS7500
  84         bool "Cirrus-CL-PS7500FE"
  85         select TIMER_ACORN
  86         select ISA
  87         help
  88           Support for the Cirrus Logic PS7500FE system-on-a-chip.
  89
  90 config ARCH_CLPS711X
  91         bool "CLPS711x/EP721x-based"
  92         help
  93           Support for Cirrus Logic 711x/721x based boards.
  94
  95 config ARCH_CO285
  96         bool "Co-EBSA285"
  97         select FOOTBRIDGE
  98         select FOOTBRIDGE_ADDIN
  99         help
 100           Support for Intel's EBSA285 companion chip.
 101
 102 config ARCH_EBSA110
 103         bool "EBSA-110"
 104         select ISA
 105         help
 106           This is an evaluation board for the StrongARM processor available
 107           from Digital. It has limited hardware on-board, including an
 108           Ethernet interface, two PCMCIA sockets, two serial ports and a
 109           parallel port.
 110
 111 config ARCH_FOOTBRIDGE
 112         bool "FootBridge"
 113         select FOOTBRIDGE
 114         help
 115           Support for systems based on the DC21285 companion chip
 116           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 117
 118 config ARCH_INTEGRATOR
 119         bool "Integrator"
 120         select ARM_AMBA
 121         select ICST525
 122         help
 123           Support for ARM's Integrator platform.
 124
 125 config ARCH_IOP3XX
 126         bool "IOP3xx-based"
 127         select PCI
 128         help
 129           Support for Intel's IOP3XX (XScale) family of processors.
 130
 131 config ARCH_IXP4XX
 132         bool "IXP4xx-based"
 133         select DMABOUNCE
 134         select PCI
 135         help
 136           Support for Intel's IXP4XX (XScale) family of processors.
 137
 138 config ARCH_IXP2000
 139         bool "IXP2400/2800-based"
 140         select PCI
 141         help
 142           Support for Intel's IXP2400/2800 (XScale) family of processors.
 143
 144 config ARCH_L7200
 145         bool "LinkUp-L7200"
 146         select FIQ
 147         help
 148           Say Y here if you intend to run this kernel on a LinkUp Systems
 149           L7200 Software Development Board which uses an ARM720T processor.
 150           Information on this board can be obtained at:
 151
 152           <http://www.linkupsys.com/>
 153
 154           If you have any questions or comments about the Linux kernel port
 155           to this board, send e-mail to <sjhill@cotw.com>.
 156
 157 config ARCH_PXA
 158         bool "PXA2xx-based"
 159         select ARCH_MTD_XIP
 160         help
 161           Support for Intel's PXA2XX processor line.
 162
 163 config ARCH_RPC
 164         bool "RiscPC"
 165         select ARCH_ACORN
 166         select FIQ
 167         select TIMER_ACORN
 168         select ARCH_MAY_HAVE_PC_FDC
 169         select ISA_DMA_API
 170         help
 171           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 172           CD-ROM interface, serial and parallel port, and the floppy drive.
 173
 174 config ARCH_SA1100
 175         bool "SA1100-based"
 176         select ISA
 177         select ARCH_DISCONTIGMEM_ENABLE
 178         select ARCH_MTD_XIP
 179         help
 180           Support for StrongARM 11x0 based boards.
 181
 182 config ARCH_S3C2410
 183         bool "Samsung S3C2410"
 184         help
 185           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 186           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 187           the Samsung SMDK2410 development board (and derivatives).
 188
 189 config ARCH_SHARK
 190         bool "Shark"
 191         select ISA
 192         select ISA_DMA
 193         select PCI
 194         help
 195           Support for the StrongARM based Digital DNARD machine, also known
 196           as "Shark" (<http://www.shark-linux.de/shark.html>).
 197
 198 config ARCH_LH7A40X
 199         bool "Sharp LH7A40X"
 200         help
 201           Say Y here for systems based on one of the Sharp LH7A40X
 202           System on a Chip processors.  These CPUs include an ARM922T
 203           core with a wide array of integrated devices for
 204           hand-held and low-power applications.
 205
 206 config ARCH_OMAP
 207         bool "TI OMAP"
 208         help
 209           Support for TI's OMAP platform (OMAP1 and OMAP2).
 210
 211 config ARCH_VERSATILE
 212         bool "Versatile"
 213         select ARM_AMBA
 214         select ARM_VIC
 215         select ICST307
 216         help
 217           This enables support for ARM Ltd Versatile board.
 218
 219 config ARCH_REALVIEW
 220         bool "RealView"
 221         select ARM_AMBA
 222         select ICST307
 223         help
 224           This enables support for ARM Ltd RealView boards.
 225
 226 config ARCH_IMX
 227         bool "IMX"
 228         help
 229           Support for Motorola's i.MX family of processors (MX1, MXL).
 230
 231 config ARCH_H720X
 232         bool "Hynix-HMS720x-based"
 233         select ISA_DMA_API
 234         help
 235           This enables support for systems based on the Hynix HMS720x
 236
 237 config ARCH_AAEC2000
 238         bool "Agilent AAEC-2000 based"
 239         select ARM_AMBA
 240         help
 241           This enables support for systems based on the Agilent AAEC-2000
 242
 243 config ARCH_AT91RM9200
 244         bool "AT91RM9200"
 245         help
 246           Say Y here if you intend to run this kernel on an Atmel
 247           AT91RM9200-based board.
 248
 249 endchoice
 250
 251 source "arch/arm/mach-clps711x/Kconfig"
 252
 253 source "arch/arm/mach-footbridge/Kconfig"
 254
 255 source "arch/arm/mach-integrator/Kconfig"
 256
 257 source "arch/arm/mach-iop3xx/Kconfig"
 258
 259 source "arch/arm/mach-ixp4xx/Kconfig"
 260
 261 source "arch/arm/mach-ixp2000/Kconfig"
 262
 263 source "arch/arm/mach-pxa/Kconfig"
 264
 265 source "arch/arm/mach-sa1100/Kconfig"
 266
 267 source "arch/arm/plat-omap/Kconfig"
 268
 269 source "arch/arm/mach-omap1/Kconfig"
 270
 271 source "arch/arm/mach-omap2/Kconfig"
 272
 273 source "arch/arm/mach-s3c2410/Kconfig"
 274
 275 source "arch/arm/mach-lh7a40x/Kconfig"
 276
 277 source "arch/arm/mach-imx/Kconfig"
 278
 279 source "arch/arm/mach-h720x/Kconfig"
 280
 281 source "arch/arm/mach-versatile/Kconfig"
 282
 283 source "arch/arm/mach-aaec2000/Kconfig"
 284
 285 source "arch/arm/mach-realview/Kconfig"
 286
 287 source "arch/arm/mach-at91rm9200/Kconfig"
 288
 289 # Definitions to make life easier
 290 config ARCH_ACORN
 291         bool
 292
 293 source arch/arm/mm/Kconfig
 294
 295 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 296 config XSCALE_PMU
 297         bool
 298         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 299         default y
 300
 301 endmenu
 302
 303 source "arch/arm/common/Kconfig"
 304
 305 config FORCE_MAX_ZONEORDER
 306         int
 307         depends on SA1111
 308         default "9"
 309
 310 menu "Bus support"
 311
 312 config ARM_AMBA
 313         bool
 314
 315 config ISA
 316         bool
 317         help
 318           Find out whether you have ISA slots on your motherboard.  ISA is the
 319           name of a bus system, i.e. the way the CPU talks to the other stuff
 320           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 321           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 322           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 323
 324 # Select ISA DMA controller support
 325 config ISA_DMA
 326         bool
 327         select ISA_DMA_API
 328
 329 # Select ISA DMA interface
 330 config ISA_DMA_API
 331         bool
 332
 333 config PCI
 334         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB
 335         help
 336           Find out whether you have a PCI motherboard. PCI is the name of a
 337           bus system, i.e. the way the CPU talks to the other stuff inside
 338           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 339           VESA. If you have PCI, say Y, otherwise N.
 340
 341           The PCI-HOWTO, available from
 342           <http://www.tldp.org/docs.html#howto>, contains valuable
 343           information about which PCI hardware does work under Linux and which
 344           doesn't.
 345
 346 # Select the host bridge type
 347 config PCI_HOST_VIA82C505
 348         bool
 349         depends on PCI && ARCH_SHARK
 350         default y
 351
 352 source "drivers/pci/Kconfig"
 353
 354 source "drivers/pcmcia/Kconfig"
 355
 356 endmenu
 357
 358 menu "Kernel Features"
 359
 360 config SMP
 361         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 362         depends on EXPERIMENTAL && REALVIEW_MPCORE
 363         help
 364           This enables support for systems with more than one CPU. If you have
 365           a system with only one CPU, like most personal computers, say N. If
 366           you have a system with more than one CPU, say Y.
 367
 368           If you say N here, the kernel will run on single and multiprocessor
 369           machines, but will use only one CPU of a multiprocessor machine. If
 370           you say Y here, the kernel will run on many, but not all, single
 371           processor machines. On a single processor machine, the kernel will
 372           run faster if you say N here.
 373
 374           See also the <file:Documentation/smp.txt>,
 375           <file:Documentation/i386/IO-APIC.txt>,
 376           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 377           <http://www.linuxdoc.org/docs.html#howto>.
 378
 379           If you don't know what to do here, say N.
 380
 381 config NR_CPUS
 382         int "Maximum number of CPUs (2-32)"
 383         range 2 32
 384         depends on SMP
 385         default "4"
 386
 387 config HOTPLUG_CPU
 388         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 389         depends on SMP && HOTPLUG && EXPERIMENTAL
 390         help
 391           Say Y here to experiment with turning CPUs off and on.  CPUs
 392           can be controlled through /sys/devices/system/cpu.
 393
 394 config LOCAL_TIMERS
 395         bool "Use local timer interrupts"
 396         depends on SMP && REALVIEW_MPCORE
 397         default y
 398         help
 399           Enable support for local timers on SMP platforms, rather then the
 400           legacy IPI broadcast method.  Local timers allows the system
 401           accounting to be spread across the timer interval, preventing a
 402           "thundering herd" at every timer tick.
 403
 404 config PREEMPT
 405         bool "Preemptible Kernel (EXPERIMENTAL)"
 406         depends on EXPERIMENTAL
 407         help
 408           This option reduces the latency of the kernel when reacting to
 409           real-time or interactive events by allowing a low priority process to
 410           be preempted even if it is in kernel mode executing a system call.
 411           This allows applications to run more reliably even when the system is
 412           under load.
 413
 414           Say Y here if you are building a kernel for a desktop, embedded
 415           or real-time system.  Say N if you are unsure.
 416
 417 config NO_IDLE_HZ
 418         bool "Dynamic tick timer"
 419         help
 420           Select this option if you want to disable continuous timer ticks
 421           and have them programmed to occur as required. This option saves
 422           power as the system can remain in idle state for longer.
 423
 424           By default dynamic tick is disabled during the boot, and can be
 425           manually enabled with:
 426
 427             echo 1 > /sys/devices/system/timer/timer0/dyn_tick
 428
 429           Alternatively, if you want dynamic tick automatically enabled
 430           during boot, pass "dyntick=enable" via the kernel command string.
 431
 432           Please note that dynamic tick may affect the accuracy of
 433           timekeeping on some platforms depending on the implementation.
 434           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
 435           to have accurate timekeeping with dynamic tick.
 436
 437 config HZ
 438         int
 439         default 128 if ARCH_L7200
 440         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 441         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER_HZ != 0
 442         default 100
 443
 444 config AEABI
 445         bool "Use the ARM EABI to compile the kernel"
 446         help
 447           This option allows for the kernel to be compiled using the latest
 448           ARM ABI (aka EABI).  This is only useful if you are using a user
 449           space environment that is also compiled with EABI.
 450
 451           Since there are major incompatibilities between the legacy ABI and
 452           EABI, especially with regard to structure member alignment, this
 453           option also changes the kernel syscall calling convention to
 454           disambiguate both ABIs and allow for backward compatibility support
 455           (selected with CONFIG_OABI_COMPAT).
 456
 457           To use this you need GCC version 4.0.0 or later.
 458
 459 config OABI_COMPAT
 460         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 461         depends on AEABI && EXPERIMENTAL
 462         default y
 463         help
 464           This option preserves the old syscall interface along with the
 465           new (ARM EABI) one. It also provides a compatibility layer to
 466           intercept syscalls that have structure arguments which layout
 467           in memory differs between the legacy ABI and the new ARM EABI
 468           (only for non "thumb" binaries). This option adds a tiny
 469           overhead to all syscalls and produces a slightly larger kernel.
 470           If you know you'll be using only pure EABI user space then you
 471           can say N here. If this option is not selected and you attempt
 472           to execute a legacy ABI binary then the result will be
 473           UNPREDICTABLE (in fact it can be predicted that it won't work
 474           at all). If in doubt say Y.
 475
 476 config ARCH_DISCONTIGMEM_ENABLE
 477         bool
 478         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 479         help
 480           Say Y to support efficient handling of discontiguous physical memory,
 481           for architectures which are either NUMA (Non-Uniform Memory Access)
 482           or have huge holes in the physical address space for other reasons.
 483           See <file:Documentation/vm/numa> for more.
 484
 485 source "mm/Kconfig"
 486
 487 config LEDS
 488         bool "Timer and CPU usage LEDs"
 489         depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
 490                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 491                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 492                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 493                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 494                    ARCH_AT91RM9200
 495         help
 496           If you say Y here, the LEDs on your machine will be used
 497           to provide useful information about your current system status.
 498
 499           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 500           be able to select which LEDs are active using the options below. If
 501           you are compiling a kernel for the EBSA-110 or the LART however, the
 502           red LED will simply flash regularly to indicate that the system is
 503           still functional. It is safe to say Y here if you have a CATS
 504           system, but the driver will do nothing.
 505
 506 config LEDS_TIMER
 507         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 508                             MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
 509         depends on LEDS
 510         default y if ARCH_EBSA110
 511         help
 512           If you say Y here, one of the system LEDs (the green one on the
 513           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 514           will flash regularly to indicate that the system is still
 515           operational. This is mainly useful to kernel hackers who are
 516           debugging unstable kernels.
 517
 518           The LART uses the same LED for both Timer LED and CPU usage LED
 519           functions. You may choose to use both, but the Timer LED function
 520           will overrule the CPU usage LED.
 521
 522 config LEDS_CPU
 523         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 524                         !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
 525         depends on LEDS
 526         help
 527           If you say Y here, the red LED will be used to give a good real
 528           time indication of CPU usage, by lighting whenever the idle task
 529           is not currently executing.
 530
 531           The LART uses the same LED for both Timer LED and CPU usage LED
 532           functions. You may choose to use both, but the Timer LED function
 533           will overrule the CPU usage LED.
 534
 535 config ALIGNMENT_TRAP
 536         bool
 537         default y if !ARCH_EBSA110
 538         help
 539           ARM processors can not fetch/store information which is not
 540           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 541           address divisible by 4. On 32-bit ARM processors, these non-aligned
 542           fetch/store instructions will be emulated in software if you say
 543           here, which has a severe performance impact. This is necessary for
 544           correct operation of some network protocols. With an IP-only
 545           configuration it is safe to say N, otherwise say Y.
 546
 547 endmenu
 548
 549 menu "Boot options"
 550
 551 # Compressed boot loader in ROM.  Yes, we really want to ask about
 552 # TEXT and BSS so we preserve their values in the config files.
 553 config ZBOOT_ROM_TEXT
 554         hex "Compressed ROM boot loader base address"
 555         default "0"
 556         help
 557           The physical address at which the ROM-able zImage is to be
 558           placed in the target.  Platforms which normally make use of
 559           ROM-able zImage formats normally set this to a suitable
 560           value in their defconfig file.
 561
 562           If ZBOOT_ROM is not enabled, this has no effect.
 563
 564 config ZBOOT_ROM_BSS
 565         hex "Compressed ROM boot loader BSS address"
 566         default "0"
 567         help
 568           The base address of 64KiB of read/write memory in the target
 569           for the ROM-able zImage, which must be available while the
 570           decompressor is running.  Platforms which normally make use of
 571           ROM-able zImage formats normally set this to a suitable
 572           value in their defconfig file.
 573
 574           If ZBOOT_ROM is not enabled, this has no effect.
 575
 576 config ZBOOT_ROM
 577         bool "Compressed boot loader in ROM/flash"
 578         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 579         help
 580           Say Y here if you intend to execute your compressed kernel image
 581           (zImage) directly from ROM or flash.  If unsure, say N.
 582
 583 config CMDLINE
 584         string "Default kernel command string"
 585         default ""
 586         help
 587           On some architectures (EBSA110 and CATS), there is currently no way
 588           for the boot loader to pass arguments to the kernel. For these
 589           architectures, you should supply some command-line options at build
 590           time by entering them here. As a minimum, you should specify the
 591           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 592
 593 config XIP_KERNEL
 594         bool "Kernel Execute-In-Place from ROM"
 595         depends on !ZBOOT_ROM
 596         help
 597           Execute-In-Place allows the kernel to run from non-volatile storage
 598           directly addressable by the CPU, such as NOR flash. This saves RAM
 599           space since the text section of the kernel is not loaded from flash
 600           to RAM.  Read-write sections, such as the data section and stack,
 601           are still copied to RAM.  The XIP kernel is not compressed since
 602           it has to run directly from flash, so it will take more space to
 603           store it.  The flash address used to link the kernel object files,
 604           and for storing it, is configuration dependent. Therefore, if you
 605           say Y here, you must know the proper physical address where to
 606           store the kernel image depending on your own flash memory usage.
 607
 608           Also note that the make target becomes "make xipImage" rather than
 609           "make zImage" or "make Image".  The final kernel binary to put in
 610           ROM memory will be arch/arm/boot/xipImage.
 611
 612           If unsure, say N.
 613
 614 config XIP_PHYS_ADDR
 615         hex "XIP Kernel Physical Location"
 616         depends on XIP_KERNEL
 617         default "0x00080000"
 618         help
 619           This is the physical address in your flash memory the kernel will
 620           be linked for and stored to.  This address is dependent on your
 621           own flash usage.
 622
 623 endmenu
 624
 625 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)
 626
 627 menu "CPU Frequency scaling"
 628
 629 source "drivers/cpufreq/Kconfig"
 630
 631 config CPU_FREQ_SA1100
 632         bool
 633         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 634         default y
 635
 636 config CPU_FREQ_SA1110
 637         bool
 638         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 639         default y
 640
 641 config CPU_FREQ_INTEGRATOR
 642         tristate "CPUfreq driver for ARM Integrator CPUs"
 643         depends on ARCH_INTEGRATOR && CPU_FREQ
 644         default y
 645         help
 646           This enables the CPUfreq driver for ARM Integrator CPUs.
 647
 648           For details, take a look at <file:Documentation/cpu-freq>.
 649
 650           If in doubt, say Y.
 651
 652 endmenu
 653
 654 endif
 655
 656 menu "Floating point emulation"
 657
 658 comment "At least one emulation must be selected"
 659
 660 config FPE_NWFPE
 661         bool "NWFPE math emulation"
 662         depends on !AEABI || OABI_COMPAT
 663         ---help---
 664           Say Y to include the NWFPE floating point emulator in the kernel.
 665           This is necessary to run most binaries. Linux does not currently
 666           support floating point hardware so you need to say Y here even if
 667           your machine has an FPA or floating point co-processor podule.
 668
 669           You may say N here if you are going to load the Acorn FPEmulator
 670           early in the bootup.
 671
 672 config FPE_NWFPE_XP
 673         bool "Support extended precision"
 674         depends on FPE_NWFPE
 675         help
 676           Say Y to include 80-bit support in the kernel floating-point
 677           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
 678           Note that gcc does not generate 80-bit operations by default,
 679           so in most cases this option only enlarges the size of the
 680           floating point emulator without any good reason.
 681
 682           You almost surely want to say N here.
 683
 684 config FPE_FASTFPE
 685         bool "FastFPE math emulation (EXPERIMENTAL)"
 686         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
 687         ---help---
 688           Say Y here to include the FAST floating point emulator in the kernel.
 689           This is an experimental much faster emulator which now also has full
 690           precision for the mantissa.  It does not support any exceptions.
 691           It is very simple, and approximately 3-6 times faster than NWFPE.
 692
 693           It should be sufficient for most programs.  It may be not suitable
 694           for scientific calculations, but you have to check this for yourself.
 695           If you do not feel you need a faster FP emulation you should better
 696           choose NWFPE.
 697
 698 config VFP
 699         bool "VFP-format floating point maths"
 700         depends on CPU_V6 || CPU_ARM926T
 701         help
 702           Say Y to include VFP support code in the kernel. This is needed
 703           if your hardware includes a VFP unit.
 704
 705           Please see <file:Documentation/arm/VFP/release-notes.txt> for
 706           release notes and additional status information.
 707
 708           Say N if your target does not have VFP hardware.
 709
 710 endmenu
 711
 712 menu "Userspace binary formats"
 713
 714 source "fs/Kconfig.binfmt"
 715
 716 config ARTHUR
 717         tristate "RISC OS personality"
 718         depends on !AEABI
 719         help
 720           Say Y here to include the kernel code necessary if you want to run
 721           Acorn RISC OS/Arthur binaries under Linux. This code is still very
 722           experimental; if this sounds frightening, say N and sleep in peace.
 723           You can also say M here to compile this support as a module (which
 724           will be called arthur).
 725
 726 endmenu
 727
 728 menu "Power management options"
 729
 730 source "kernel/power/Kconfig"
 731
 732 config APM
 733         tristate "Advanced Power Management Emulation"
 734         ---help---
 735           APM is a BIOS specification for saving power using several different
 736           techniques. This is mostly useful for battery powered laptops with
 737           APM compliant BIOSes. If you say Y here, the system time will be
 738           reset after a RESUME operation, the /proc/apm device will provide
 739           battery status information, and user-space programs will receive
 740           notification of APM "events" (e.g. battery status change).
 741
 742           In order to use APM, you will need supporting software. For location
 743           and more information, read <file:Documentation/pm.txt> and the
 744           Battery Powered Linux mini-HOWTO, available from
 745           <http://www.tldp.org/docs.html#howto>.
 746
 747           This driver does not spin down disk drives (see the hdparm(8)
 748           manpage ("man 8 hdparm") for that), and it doesn't turn off
 749           VESA-compliant "green" monitors.
 750
 751           Generally, if you don't have a battery in your machine, there isn't
 752           much point in using this driver and you should say N. If you get
 753           random kernel OOPSes or reboots that don't seem to be related to
 754           anything, try disabling/enabling this option (or disabling/enabling
 755           APM in your BIOS).
 756
 757 endmenu
 758
 759 source "net/Kconfig"
 760
 761 menu "Device Drivers"
 762
 763 source "drivers/base/Kconfig"
 764
 765 source "drivers/connector/Kconfig"
 766
 767 if ALIGNMENT_TRAP
 768 source "drivers/mtd/Kconfig"
 769 endif
 770
 771 source "drivers/parport/Kconfig"
 772
 773 source "drivers/pnp/Kconfig"
 774
 775 source "drivers/block/Kconfig"
 776
 777 source "drivers/acorn/block/Kconfig"
 778
 779 if PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \
 780         || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
 781         || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
 782 source "drivers/ide/Kconfig"
 783 endif
 784
 785 source "drivers/scsi/Kconfig"
 786
 787 source "drivers/md/Kconfig"
 788
 789 source "drivers/message/fusion/Kconfig"
 790
 791 source "drivers/ieee1394/Kconfig"
 792
 793 source "drivers/message/i2o/Kconfig"
 794
 795 source "drivers/net/Kconfig"
 796
 797 source "drivers/isdn/Kconfig"
 798
 799 # input before char - char/joystick depends on it. As does USB.
 800
 801 source "drivers/input/Kconfig"
 802
 803 source "drivers/char/Kconfig"
 804
 805 source "drivers/i2c/Kconfig"
 806
 807 source "drivers/spi/Kconfig"
 808
 809 source "drivers/w1/Kconfig"
 810
 811 source "drivers/hwmon/Kconfig"
 812
 813 #source "drivers/l3/Kconfig"
 814
 815 source "drivers/misc/Kconfig"
 816
 817 source "drivers/mfd/Kconfig"
 818
 819 source "drivers/media/Kconfig"
 820
 821 source "drivers/video/Kconfig"
 822
 823 source "sound/Kconfig"
 824
 825 source "drivers/usb/Kconfig"
 826
 827 source "drivers/mmc/Kconfig"
 828
 829 endmenu
 830
 831 source "fs/Kconfig"
 832
 833 source "arch/arm/oprofile/Kconfig"
 834
 835 source "arch/arm/Kconfig.debug"
 836
 837 source "security/Kconfig"
 838
 839 source "crypto/Kconfig"
 840
 841 source "lib/Kconfig"