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_EP93XX
 112         bool "EP93xx-based"
 113         select ARM_AMBA
 114         select ARM_VIC
 115         help
 116           This enables support for the Cirrus EP93xx series of CPUs.
 117
 118 config ARCH_FOOTBRIDGE
 119         bool "FootBridge"
 120         select FOOTBRIDGE
 121         help
 122           Support for systems based on the DC21285 companion chip
 123           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 124
 125 config ARCH_INTEGRATOR
 126         bool "Integrator"
 127         select ARM_AMBA
 128         select ICST525
 129         help
 130           Support for ARM's Integrator platform.
 131
 132 config ARCH_IOP3XX
 133         bool "IOP3xx-based"
 134         select PCI
 135         help
 136           Support for Intel's IOP3XX (XScale) family of processors.
 137
 138 config ARCH_IXP4XX
 139         bool "IXP4xx-based"
 140         select DMABOUNCE
 141         select PCI
 142         help
 143           Support for Intel's IXP4XX (XScale) family of processors.
 144
 145 config ARCH_IXP2000
 146         bool "IXP2400/2800-based"
 147         select PCI
 148         help
 149           Support for Intel's IXP2400/2800 (XScale) family of processors.
 150
 151 config ARCH_L7200
 152         bool "LinkUp-L7200"
 153         select FIQ
 154         help
 155           Say Y here if you intend to run this kernel on a LinkUp Systems
 156           L7200 Software Development Board which uses an ARM720T processor.
 157           Information on this board can be obtained at:
 158
 159           <http://www.linkupsys.com/>
 160
 161           If you have any questions or comments about the Linux kernel port
 162           to this board, send e-mail to <sjhill@cotw.com>.
 163
 164 config ARCH_PXA
 165         bool "PXA2xx-based"
 166         select ARCH_MTD_XIP
 167         help
 168           Support for Intel's PXA2XX processor line.
 169
 170 config ARCH_RPC
 171         bool "RiscPC"
 172         select ARCH_ACORN
 173         select FIQ
 174         select TIMER_ACORN
 175         select ARCH_MAY_HAVE_PC_FDC
 176         select ISA_DMA_API
 177         help
 178           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 179           CD-ROM interface, serial and parallel port, and the floppy drive.
 180
 181 config ARCH_SA1100
 182         bool "SA1100-based"
 183         select ISA
 184         select ARCH_DISCONTIGMEM_ENABLE
 185         select ARCH_MTD_XIP
 186         help
 187           Support for StrongARM 11x0 based boards.
 188
 189 config ARCH_S3C2410
 190         bool "Samsung S3C2410"
 191         help
 192           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 193           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 194           the Samsung SMDK2410 development board (and derivatives).
 195
 196 config ARCH_SHARK
 197         bool "Shark"
 198         select ISA
 199         select ISA_DMA
 200         select PCI
 201         help
 202           Support for the StrongARM based Digital DNARD machine, also known
 203           as "Shark" (<http://www.shark-linux.de/shark.html>).
 204
 205 config ARCH_LH7A40X
 206         bool "Sharp LH7A40X"
 207         help
 208           Say Y here for systems based on one of the Sharp LH7A40X
 209           System on a Chip processors.  These CPUs include an ARM922T
 210           core with a wide array of integrated devices for
 211           hand-held and low-power applications.
 212
 213 config ARCH_OMAP
 214         bool "TI OMAP"
 215         help
 216           Support for TI's OMAP platform (OMAP1 and OMAP2).
 217
 218 config ARCH_VERSATILE
 219         bool "Versatile"
 220         select ARM_AMBA
 221         select ARM_VIC
 222         select ICST307
 223         help
 224           This enables support for ARM Ltd Versatile board.
 225
 226 config ARCH_REALVIEW
 227         bool "RealView"
 228         select ARM_AMBA
 229         select ICST307
 230         help
 231           This enables support for ARM Ltd RealView boards.
 232
 233 config ARCH_IMX
 234         bool "IMX"
 235         help
 236           Support for Motorola's i.MX family of processors (MX1, MXL).
 237
 238 config ARCH_H720X
 239         bool "Hynix-HMS720x-based"
 240         select ISA_DMA_API
 241         help
 242           This enables support for systems based on the Hynix HMS720x
 243
 244 config ARCH_AAEC2000
 245         bool "Agilent AAEC-2000 based"
 246         select ARM_AMBA
 247         help
 248           This enables support for systems based on the Agilent AAEC-2000
 249
 250 config ARCH_AT91RM9200
 251         bool "AT91RM9200"
 252         help
 253           Say Y here if you intend to run this kernel on an Atmel
 254           AT91RM9200-based board.
 255
 256 endchoice
 257
 258 source "arch/arm/mach-clps711x/Kconfig"
 259
 260 source "arch/arm/mach-ep93xx/Kconfig"
 261
 262 source "arch/arm/mach-footbridge/Kconfig"
 263
 264 source "arch/arm/mach-integrator/Kconfig"
 265
 266 source "arch/arm/mach-iop3xx/Kconfig"
 267
 268 source "arch/arm/mach-ixp4xx/Kconfig"
 269
 270 source "arch/arm/mach-ixp2000/Kconfig"
 271
 272 source "arch/arm/mach-pxa/Kconfig"
 273
 274 source "arch/arm/mach-sa1100/Kconfig"
 275
 276 source "arch/arm/plat-omap/Kconfig"
 277
 278 source "arch/arm/mach-omap1/Kconfig"
 279
 280 source "arch/arm/mach-omap2/Kconfig"
 281
 282 source "arch/arm/mach-s3c2410/Kconfig"
 283
 284 source "arch/arm/mach-lh7a40x/Kconfig"
 285
 286 source "arch/arm/mach-imx/Kconfig"
 287
 288 source "arch/arm/mach-h720x/Kconfig"
 289
 290 source "arch/arm/mach-versatile/Kconfig"
 291
 292 source "arch/arm/mach-aaec2000/Kconfig"
 293
 294 source "arch/arm/mach-realview/Kconfig"
 295
 296 source "arch/arm/mach-at91rm9200/Kconfig"
 297
 298 # Definitions to make life easier
 299 config ARCH_ACORN
 300         bool
 301
 302 source arch/arm/mm/Kconfig
 303
 304 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 305 config XSCALE_PMU
 306         bool
 307         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 308         default y
 309
 310 endmenu
 311
 312 source "arch/arm/common/Kconfig"
 313
 314 config FORCE_MAX_ZONEORDER
 315         int
 316         depends on SA1111
 317         default "9"
 318
 319 menu "Bus support"
 320
 321 config ARM_AMBA
 322         bool
 323
 324 config ISA
 325         bool
 326         help
 327           Find out whether you have ISA slots on your motherboard.  ISA is the
 328           name of a bus system, i.e. the way the CPU talks to the other stuff
 329           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 330           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 331           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 332
 333 # Select ISA DMA controller support
 334 config ISA_DMA
 335         bool
 336         select ISA_DMA_API
 337
 338 # Select ISA DMA interface
 339 config ISA_DMA_API
 340         bool
 341
 342 config PCI
 343         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB
 344         help
 345           Find out whether you have a PCI motherboard. PCI is the name of a
 346           bus system, i.e. the way the CPU talks to the other stuff inside
 347           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 348           VESA. If you have PCI, say Y, otherwise N.
 349
 350           The PCI-HOWTO, available from
 351           <http://www.tldp.org/docs.html#howto>, contains valuable
 352           information about which PCI hardware does work under Linux and which
 353           doesn't.
 354
 355 # Select the host bridge type
 356 config PCI_HOST_VIA82C505
 357         bool
 358         depends on PCI && ARCH_SHARK
 359         default y
 360
 361 source "drivers/pci/Kconfig"
 362
 363 source "drivers/pcmcia/Kconfig"
 364
 365 endmenu
 366
 367 menu "Kernel Features"
 368
 369 config SMP
 370         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 371         depends on EXPERIMENTAL && REALVIEW_MPCORE
 372         help
 373           This enables support for systems with more than one CPU. If you have
 374           a system with only one CPU, like most personal computers, say N. If
 375           you have a system with more than one CPU, say Y.
 376
 377           If you say N here, the kernel will run on single and multiprocessor
 378           machines, but will use only one CPU of a multiprocessor machine. If
 379           you say Y here, the kernel will run on many, but not all, single
 380           processor machines. On a single processor machine, the kernel will
 381           run faster if you say N here.
 382
 383           See also the <file:Documentation/smp.txt>,
 384           <file:Documentation/i386/IO-APIC.txt>,
 385           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 386           <http://www.linuxdoc.org/docs.html#howto>.
 387
 388           If you don't know what to do here, say N.
 389
 390 config NR_CPUS
 391         int "Maximum number of CPUs (2-32)"
 392         range 2 32
 393         depends on SMP
 394         default "4"
 395
 396 config HOTPLUG_CPU
 397         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 398         depends on SMP && HOTPLUG && EXPERIMENTAL
 399         help
 400           Say Y here to experiment with turning CPUs off and on.  CPUs
 401           can be controlled through /sys/devices/system/cpu.
 402
 403 config LOCAL_TIMERS
 404         bool "Use local timer interrupts"
 405         depends on SMP && REALVIEW_MPCORE
 406         default y
 407         help
 408           Enable support for local timers on SMP platforms, rather then the
 409           legacy IPI broadcast method.  Local timers allows the system
 410           accounting to be spread across the timer interval, preventing a
 411           "thundering herd" at every timer tick.
 412
 413 config PREEMPT
 414         bool "Preemptible Kernel (EXPERIMENTAL)"
 415         depends on EXPERIMENTAL
 416         help
 417           This option reduces the latency of the kernel when reacting to
 418           real-time or interactive events by allowing a low priority process to
 419           be preempted even if it is in kernel mode executing a system call.
 420           This allows applications to run more reliably even when the system is
 421           under load.
 422
 423           Say Y here if you are building a kernel for a desktop, embedded
 424           or real-time system.  Say N if you are unsure.
 425
 426 config NO_IDLE_HZ
 427         bool "Dynamic tick timer"
 428         help
 429           Select this option if you want to disable continuous timer ticks
 430           and have them programmed to occur as required. This option saves
 431           power as the system can remain in idle state for longer.
 432
 433           By default dynamic tick is disabled during the boot, and can be
 434           manually enabled with:
 435
 436             echo 1 > /sys/devices/system/timer/timer0/dyn_tick
 437
 438           Alternatively, if you want dynamic tick automatically enabled
 439           during boot, pass "dyntick=enable" via the kernel command string.
 440
 441           Please note that dynamic tick may affect the accuracy of
 442           timekeeping on some platforms depending on the implementation.
 443           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
 444           to have accurate timekeeping with dynamic tick.
 445
 446 config HZ
 447         int
 448         default 128 if ARCH_L7200
 449         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 450         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 451         default 100
 452
 453 config AEABI
 454         bool "Use the ARM EABI to compile the kernel"
 455         help
 456           This option allows for the kernel to be compiled using the latest
 457           ARM ABI (aka EABI).  This is only useful if you are using a user
 458           space environment that is also compiled with EABI.
 459
 460           Since there are major incompatibilities between the legacy ABI and
 461           EABI, especially with regard to structure member alignment, this
 462           option also changes the kernel syscall calling convention to
 463           disambiguate both ABIs and allow for backward compatibility support
 464           (selected with CONFIG_OABI_COMPAT).
 465
 466           To use this you need GCC version 4.0.0 or later.
 467
 468 config OABI_COMPAT
 469         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 470         depends on AEABI && EXPERIMENTAL
 471         default y
 472         help
 473           This option preserves the old syscall interface along with the
 474           new (ARM EABI) one. It also provides a compatibility layer to
 475           intercept syscalls that have structure arguments which layout
 476           in memory differs between the legacy ABI and the new ARM EABI
 477           (only for non "thumb" binaries). This option adds a tiny
 478           overhead to all syscalls and produces a slightly larger kernel.
 479           If you know you'll be using only pure EABI user space then you
 480           can say N here. If this option is not selected and you attempt
 481           to execute a legacy ABI binary then the result will be
 482           UNPREDICTABLE (in fact it can be predicted that it won't work
 483           at all). If in doubt say Y.
 484
 485 config ARCH_DISCONTIGMEM_ENABLE
 486         bool
 487         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 488         help
 489           Say Y to support efficient handling of discontiguous physical memory,
 490           for architectures which are either NUMA (Non-Uniform Memory Access)
 491           or have huge holes in the physical address space for other reasons.
 492           See <file:Documentation/vm/numa> for more.
 493
 494 source "mm/Kconfig"
 495
 496 config LEDS
 497         bool "Timer and CPU usage LEDs"
 498         depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
 499                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 500                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 501                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 502                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 503                    ARCH_AT91RM9200
 504         help
 505           If you say Y here, the LEDs on your machine will be used
 506           to provide useful information about your current system status.
 507
 508           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 509           be able to select which LEDs are active using the options below. If
 510           you are compiling a kernel for the EBSA-110 or the LART however, the
 511           red LED will simply flash regularly to indicate that the system is
 512           still functional. It is safe to say Y here if you have a CATS
 513           system, but the driver will do nothing.
 514
 515 config LEDS_TIMER
 516         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 517                             MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
 518         depends on LEDS
 519         default y if ARCH_EBSA110
 520         help
 521           If you say Y here, one of the system LEDs (the green one on the
 522           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 523           will flash regularly to indicate that the system is still
 524           operational. This is mainly useful to kernel hackers who are
 525           debugging unstable kernels.
 526
 527           The LART uses the same LED for both Timer LED and CPU usage LED
 528           functions. You may choose to use both, but the Timer LED function
 529           will overrule the CPU usage LED.
 530
 531 config LEDS_CPU
 532         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 533                         !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
 534         depends on LEDS
 535         help
 536           If you say Y here, the red LED will be used to give a good real
 537           time indication of CPU usage, by lighting whenever the idle task
 538           is not currently executing.
 539
 540           The LART uses the same LED for both Timer LED and CPU usage LED
 541           functions. You may choose to use both, but the Timer LED function
 542           will overrule the CPU usage LED.
 543
 544 config ALIGNMENT_TRAP
 545         bool
 546         default y if !ARCH_EBSA110
 547         help
 548           ARM processors can not fetch/store information which is not
 549           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 550           address divisible by 4. On 32-bit ARM processors, these non-aligned
 551           fetch/store instructions will be emulated in software if you say
 552           here, which has a severe performance impact. This is necessary for
 553           correct operation of some network protocols. With an IP-only
 554           configuration it is safe to say N, otherwise say Y.
 555
 556 endmenu
 557
 558 menu "Boot options"
 559
 560 # Compressed boot loader in ROM.  Yes, we really want to ask about
 561 # TEXT and BSS so we preserve their values in the config files.
 562 config ZBOOT_ROM_TEXT
 563         hex "Compressed ROM boot loader base address"
 564         default "0"
 565         help
 566           The physical address at which the ROM-able zImage is to be
 567           placed in the target.  Platforms which normally make use of
 568           ROM-able zImage formats normally set this to a suitable
 569           value in their defconfig file.
 570
 571           If ZBOOT_ROM is not enabled, this has no effect.
 572
 573 config ZBOOT_ROM_BSS
 574         hex "Compressed ROM boot loader BSS address"
 575         default "0"
 576         help
 577           The base address of 64KiB of read/write memory in the target
 578           for the ROM-able zImage, which must be available while the
 579           decompressor is running.  Platforms which normally make use of
 580           ROM-able zImage formats normally set this to a suitable
 581           value in their defconfig file.
 582
 583           If ZBOOT_ROM is not enabled, this has no effect.
 584
 585 config ZBOOT_ROM
 586         bool "Compressed boot loader in ROM/flash"
 587         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 588         help
 589           Say Y here if you intend to execute your compressed kernel image
 590           (zImage) directly from ROM or flash.  If unsure, say N.
 591
 592 config CMDLINE
 593         string "Default kernel command string"
 594         default ""
 595         help
 596           On some architectures (EBSA110 and CATS), there is currently no way
 597           for the boot loader to pass arguments to the kernel. For these
 598           architectures, you should supply some command-line options at build
 599           time by entering them here. As a minimum, you should specify the
 600           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 601
 602 config XIP_KERNEL
 603         bool "Kernel Execute-In-Place from ROM"
 604         depends on !ZBOOT_ROM
 605         help
 606           Execute-In-Place allows the kernel to run from non-volatile storage
 607           directly addressable by the CPU, such as NOR flash. This saves RAM
 608           space since the text section of the kernel is not loaded from flash
 609           to RAM.  Read-write sections, such as the data section and stack,
 610           are still copied to RAM.  The XIP kernel is not compressed since
 611           it has to run directly from flash, so it will take more space to
 612           store it.  The flash address used to link the kernel object files,
 613           and for storing it, is configuration dependent. Therefore, if you
 614           say Y here, you must know the proper physical address where to
 615           store the kernel image depending on your own flash memory usage.
 616
 617           Also note that the make target becomes "make xipImage" rather than
 618           "make zImage" or "make Image".  The final kernel binary to put in
 619           ROM memory will be arch/arm/boot/xipImage.
 620
 621           If unsure, say N.
 622
 623 config XIP_PHYS_ADDR
 624         hex "XIP Kernel Physical Location"
 625         depends on XIP_KERNEL
 626         default "0x00080000"
 627         help
 628           This is the physical address in your flash memory the kernel will
 629           be linked for and stored to.  This address is dependent on your
 630           own flash usage.
 631
 632 endmenu
 633
 634 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)
 635
 636 menu "CPU Frequency scaling"
 637
 638 source "drivers/cpufreq/Kconfig"
 639
 640 config CPU_FREQ_SA1100
 641         bool
 642         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 643         default y
 644
 645 config CPU_FREQ_SA1110
 646         bool
 647         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 648         default y
 649
 650 config CPU_FREQ_INTEGRATOR
 651         tristate "CPUfreq driver for ARM Integrator CPUs"
 652         depends on ARCH_INTEGRATOR && CPU_FREQ
 653         default y
 654         help
 655           This enables the CPUfreq driver for ARM Integrator CPUs.
 656
 657           For details, take a look at <file:Documentation/cpu-freq>.
 658
 659           If in doubt, say Y.
 660
 661 endmenu
 662
 663 endif
 664
 665 menu "Floating point emulation"
 666
 667 comment "At least one emulation must be selected"
 668
 669 config FPE_NWFPE
 670         bool "NWFPE math emulation"
 671         depends on !AEABI || OABI_COMPAT
 672         ---help---
 673           Say Y to include the NWFPE floating point emulator in the kernel.
 674           This is necessary to run most binaries. Linux does not currently
 675           support floating point hardware so you need to say Y here even if
 676           your machine has an FPA or floating point co-processor podule.
 677
 678           You may say N here if you are going to load the Acorn FPEmulator
 679           early in the bootup.
 680
 681 config FPE_NWFPE_XP
 682         bool "Support extended precision"
 683         depends on FPE_NWFPE
 684         help
 685           Say Y to include 80-bit support in the kernel floating-point
 686           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
 687           Note that gcc does not generate 80-bit operations by default,
 688           so in most cases this option only enlarges the size of the
 689           floating point emulator without any good reason.
 690
 691           You almost surely want to say N here.
 692
 693 config FPE_FASTFPE
 694         bool "FastFPE math emulation (EXPERIMENTAL)"
 695         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
 696         ---help---
 697           Say Y here to include the FAST floating point emulator in the kernel.
 698           This is an experimental much faster emulator which now also has full
 699           precision for the mantissa.  It does not support any exceptions.
 700           It is very simple, and approximately 3-6 times faster than NWFPE.
 701
 702           It should be sufficient for most programs.  It may be not suitable
 703           for scientific calculations, but you have to check this for yourself.
 704           If you do not feel you need a faster FP emulation you should better
 705           choose NWFPE.
 706
 707 config VFP
 708         bool "VFP-format floating point maths"
 709         depends on CPU_V6 || CPU_ARM926T
 710         help
 711           Say Y to include VFP support code in the kernel. This is needed
 712           if your hardware includes a VFP unit.
 713
 714           Please see <file:Documentation/arm/VFP/release-notes.txt> for
 715           release notes and additional status information.
 716
 717           Say N if your target does not have VFP hardware.
 718
 719 endmenu
 720
 721 menu "Userspace binary formats"
 722
 723 source "fs/Kconfig.binfmt"
 724
 725 config ARTHUR
 726         tristate "RISC OS personality"
 727         depends on !AEABI
 728         help
 729           Say Y here to include the kernel code necessary if you want to run
 730           Acorn RISC OS/Arthur binaries under Linux. This code is still very
 731           experimental; if this sounds frightening, say N and sleep in peace.
 732           You can also say M here to compile this support as a module (which
 733           will be called arthur).
 734
 735 endmenu
 736
 737 menu "Power management options"
 738
 739 source "kernel/power/Kconfig"
 740
 741 config APM
 742         tristate "Advanced Power Management Emulation"
 743         ---help---
 744           APM is a BIOS specification for saving power using several different
 745           techniques. This is mostly useful for battery powered laptops with
 746           APM compliant BIOSes. If you say Y here, the system time will be
 747           reset after a RESUME operation, the /proc/apm device will provide
 748           battery status information, and user-space programs will receive
 749           notification of APM "events" (e.g. battery status change).
 750
 751           In order to use APM, you will need supporting software. For location
 752           and more information, read <file:Documentation/pm.txt> and the
 753           Battery Powered Linux mini-HOWTO, available from
 754           <http://www.tldp.org/docs.html#howto>.
 755
 756           This driver does not spin down disk drives (see the hdparm(8)
 757           manpage ("man 8 hdparm") for that), and it doesn't turn off
 758           VESA-compliant "green" monitors.
 759
 760           Generally, if you don't have a battery in your machine, there isn't
 761           much point in using this driver and you should say N. If you get
 762           random kernel OOPSes or reboots that don't seem to be related to
 763           anything, try disabling/enabling this option (or disabling/enabling
 764           APM in your BIOS).
 765
 766 endmenu
 767
 768 source "net/Kconfig"
 769
 770 menu "Device Drivers"
 771
 772 source "drivers/base/Kconfig"
 773
 774 source "drivers/connector/Kconfig"
 775
 776 if ALIGNMENT_TRAP
 777 source "drivers/mtd/Kconfig"
 778 endif
 779
 780 source "drivers/parport/Kconfig"
 781
 782 source "drivers/pnp/Kconfig"
 783
 784 source "drivers/block/Kconfig"
 785
 786 source "drivers/acorn/block/Kconfig"
 787
 788 if PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \
 789         || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
 790         || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
 791 source "drivers/ide/Kconfig"
 792 endif
 793
 794 source "drivers/scsi/Kconfig"
 795
 796 source "drivers/md/Kconfig"
 797
 798 source "drivers/message/fusion/Kconfig"
 799
 800 source "drivers/ieee1394/Kconfig"
 801
 802 source "drivers/message/i2o/Kconfig"
 803
 804 source "drivers/net/Kconfig"
 805
 806 source "drivers/isdn/Kconfig"
 807
 808 # input before char - char/joystick depends on it. As does USB.
 809
 810 source "drivers/input/Kconfig"
 811
 812 source "drivers/char/Kconfig"
 813
 814 source "drivers/i2c/Kconfig"
 815
 816 source "drivers/spi/Kconfig"
 817
 818 source "drivers/w1/Kconfig"
 819
 820 source "drivers/hwmon/Kconfig"
 821
 822 #source "drivers/l3/Kconfig"
 823
 824 source "drivers/misc/Kconfig"
 825
 826 source "drivers/mfd/Kconfig"
 827
 828 source "drivers/media/Kconfig"
 829
 830 source "drivers/video/Kconfig"
 831
 832 source "sound/Kconfig"
 833
 834 source "drivers/usb/Kconfig"
 835
 836 source "drivers/mmc/Kconfig"
 837
 838 endmenu
 839
 840 source "fs/Kconfig"
 841
 842 source "arch/arm/oprofile/Kconfig"
 843
 844 source "arch/arm/Kconfig.debug"
 845
 846 source "security/Kconfig"
 847
 848 source "crypto/Kconfig"
 849
 850 source "lib/Kconfig"