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         select RTC_LIB
  12         help
  13           The ARM series is a line of low-power-consumption RISC chip designs
  14           licensed by ARM Ltd and targeted at embedded applications and
  15           handhelds such as the Compaq IPAQ.  ARM-based PCs are no longer
  16           manufactured, but legacy ARM-based PC hardware remains popular in
  17           Europe.  There is an ARM Linux project with a web page at
  18           <http://www.arm.linux.org.uk/>.
  19
  20 config GENERIC_TIME
  21         bool
  22         default n
  23
  24 config MMU
  25         bool
  26         default y
  27
  28 config EISA
  29         bool
  30         ---help---
  31           The Extended Industry Standard Architecture (EISA) bus was
  32           developed as an open alternative to the IBM MicroChannel bus.
  33
  34           The EISA bus provided some of the features of the IBM MicroChannel
  35           bus while maintaining backward compatibility with cards made for
  36           the older ISA bus.  The EISA bus saw limited use between 1988 and
  37           1995 when it was made obsolete by the PCI bus.
  38
  39           Say Y here if you are building a kernel for an EISA-based machine.
  40
  41           Otherwise, say N.
  42
  43 config SBUS
  44         bool
  45
  46 config MCA
  47         bool
  48         help
  49           MicroChannel Architecture is found in some IBM PS/2 machines and
  50           laptops.  It is a bus system similar to PCI or ISA. See
  51           <file:Documentation/mca.txt> (and especially the web page given
  52           there) before attempting to build an MCA bus kernel.
  53
  54 config GENERIC_HARDIRQS
  55         bool
  56         default y
  57
  58 config TRACE_IRQFLAGS_SUPPORT
  59         bool
  60         default y
  61
  62 config HARDIRQS_SW_RESEND
  63         bool
  64         default y
  65
  66 config GENERIC_IRQ_PROBE
  67         bool
  68         default y
  69
  70 config RWSEM_GENERIC_SPINLOCK
  71         bool
  72         default y
  73
  74 config RWSEM_XCHGADD_ALGORITHM
  75         bool
  76
  77 config ARCH_HAS_ILOG2_U32
  78         bool
  79         default n
  80
  81 config ARCH_HAS_ILOG2_U64
  82         bool
  83         default n
  84
  85 config GENERIC_HWEIGHT
  86         bool
  87         default y
  88
  89 config GENERIC_CALIBRATE_DELAY
  90         bool
  91         default y
  92
  93 config GENERIC_BUST_SPINLOCK
  94         bool
  95
  96 config ARCH_MAY_HAVE_PC_FDC
  97         bool
  98
  99 config GENERIC_ISA_DMA
 100         bool
 101
 102 config FIQ
 103         bool
 104
 105 config ARCH_MTD_XIP
 106         bool
 107
 108 config VECTORS_BASE
 109         hex
 110         default 0xffff0000 if MMU || CPU_HIGH_VECTOR
 111         default DRAM_BASE if REMAP_VECTORS_TO_RAM
 112         default 0x00000000
 113         help
 114           The base address of exception vectors.
 115
 116 source "init/Kconfig"
 117
 118 menu "System Type"
 119
 120 choice
 121         prompt "ARM system type"
 122         default ARCH_VERSATILE
 123
 124 config ARCH_AAEC2000
 125         bool "Agilent AAEC-2000 based"
 126         select ARM_AMBA
 127         help
 128           This enables support for systems based on the Agilent AAEC-2000
 129
 130 config ARCH_INTEGRATOR
 131         bool "ARM Ltd. Integrator family"
 132         select ARM_AMBA
 133         select ICST525
 134         help
 135           Support for ARM's Integrator platform.
 136
 137 config ARCH_REALVIEW
 138         bool "ARM Ltd. RealView family"
 139         select ARM_AMBA
 140         select ICST307
 141         help
 142           This enables support for ARM Ltd RealView boards.
 143
 144 config ARCH_VERSATILE
 145         bool "ARM Ltd. Versatile family"
 146         select ARM_AMBA
 147         select ARM_VIC
 148         select ICST307
 149         help
 150           This enables support for ARM Ltd Versatile board.
 151
 152 config ARCH_AT91
 153         bool "Atmel AT91"
 154         help
 155           This enables support for systems based on the Atmel AT91RM9200
 156           and AT91SAM9xxx processors.
 157
 158 config ARCH_CLPS7500
 159         bool "Cirrus CL-PS7500FE"
 160         select TIMER_ACORN
 161         select ISA
 162         help
 163           Support for the Cirrus Logic PS7500FE system-on-a-chip.
 164
 165 config ARCH_CLPS711X
 166         bool "Cirrus Logic CLPS711x/EP721x-based"
 167         help
 168           Support for Cirrus Logic 711x/721x based boards.
 169
 170 config ARCH_CO285
 171         bool "Co-EBSA285"
 172         select FOOTBRIDGE
 173         select FOOTBRIDGE_ADDIN
 174         help
 175           Support for Intel's EBSA285 companion chip.
 176
 177 config ARCH_EBSA110
 178         bool "EBSA-110"
 179         select ISA
 180         help
 181           This is an evaluation board for the StrongARM processor available
 182           from Digital. It has limited hardware on-board, including an
 183           Ethernet interface, two PCMCIA sockets, two serial ports and a
 184           parallel port.
 185
 186 config ARCH_EP93XX
 187         bool "EP93xx-based"
 188         select ARM_AMBA
 189         select ARM_VIC
 190         help
 191           This enables support for the Cirrus EP93xx series of CPUs.
 192
 193 config ARCH_FOOTBRIDGE
 194         bool "FootBridge"
 195         select FOOTBRIDGE
 196         help
 197           Support for systems based on the DC21285 companion chip
 198           ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 199
 200 config ARCH_NETX
 201         bool "Hilscher NetX based"
 202         select ARM_VIC
 203         help
 204           This enables support for systems based on the Hilscher NetX Soc
 205
 206 config ARCH_H720X
 207         bool "Hynix HMS720x-based"
 208         select ISA_DMA_API
 209         help
 210           This enables support for systems based on the Hynix HMS720x
 211
 212 config ARCH_IMX
 213         bool "IMX"
 214         help
 215           Support for Motorola's i.MX family of processors (MX1, MXL).
 216
 217 config ARCH_IOP32X
 218         bool "IOP32x-based"
 219         depends on MMU
 220         select PLAT_IOP
 221         select PCI
 222         help
 223           Support for Intel's 80219 and IOP32X (XScale) family of
 224           processors.
 225
 226 config ARCH_IOP33X
 227         bool "IOP33x-based"
 228         depends on MMU
 229         select PLAT_IOP
 230         select PCI
 231         help
 232           Support for Intel's IOP33X (XScale) family of processors.
 233
 234 config ARCH_IOP13XX
 235         bool "IOP13xx-based"
 236         select PCI
 237         help
 238           Support for Intel's IOP13XX (XScale) family of processors.
 239
 240 config ARCH_IXP4XX
 241         bool "IXP4xx-based"
 242         depends on MMU
 243         select GENERIC_TIME
 244         help
 245           Support for Intel's IXP4XX (XScale) family of processors.
 246
 247 config ARCH_IXP2000
 248         bool "IXP2400/2800-based"
 249         depends on MMU
 250         select PCI
 251         help
 252           Support for Intel's IXP2400/2800 (XScale) family of processors.
 253
 254 config ARCH_IXP23XX
 255         bool "IXP23XX-based"
 256         depends on MMU
 257         select PCI
 258         help
 259           Support for Intel's IXP23xx (XScale) family of processors.
 260
 261 config ARCH_L7200
 262         bool "LinkUp-L7200"
 263         select FIQ
 264         help
 265           Say Y here if you intend to run this kernel on a LinkUp Systems
 266           L7200 Software Development Board which uses an ARM720T processor.
 267           Information on this board can be obtained at:
 268
 269           <http://www.linkupsys.com/>
 270
 271           If you have any questions or comments about the Linux kernel port
 272           to this board, send e-mail to <sjhill@cotw.com>.
 273
 274 config ARCH_PNX4008
 275         bool "Philips Nexperia PNX4008 Mobile"
 276         help
 277           This enables support for Philips PNX4008 mobile platform.
 278
 279 config ARCH_PXA
 280         bool "PXA2xx-based"
 281         depends on MMU
 282         select ARCH_MTD_XIP
 283         help
 284           Support for Intel's PXA2XX processor line.
 285
 286 config ARCH_RPC
 287         bool "RiscPC"
 288         select ARCH_ACORN
 289         select FIQ
 290         select TIMER_ACORN
 291         select ARCH_MAY_HAVE_PC_FDC
 292         select ISA_DMA_API
 293         help
 294           On the Acorn Risc-PC, Linux can support the internal IDE disk and
 295           CD-ROM interface, serial and parallel port, and the floppy drive.
 296
 297 config ARCH_SA1100
 298         bool "SA1100-based"
 299         select ISA
 300         select ARCH_DISCONTIGMEM_ENABLE
 301         select ARCH_MTD_XIP
 302         help
 303           Support for StrongARM 11x0 based boards.
 304
 305 config ARCH_S3C2410
 306         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442"
 307         help
 308           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
 309           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
 310           the Samsung SMDK2410 development board (and derivatives).
 311
 312 config ARCH_SHARK
 313         bool "Shark"
 314         select ISA
 315         select ISA_DMA
 316         select PCI
 317         help
 318           Support for the StrongARM based Digital DNARD machine, also known
 319           as "Shark" (<http://www.shark-linux.de/shark.html>).
 320
 321 config ARCH_LH7A40X
 322         bool "Sharp LH7A40X"
 323         help
 324           Say Y here for systems based on one of the Sharp LH7A40X
 325           System on a Chip processors.  These CPUs include an ARM922T
 326           core with a wide array of integrated devices for
 327           hand-held and low-power applications.
 328
 329 config ARCH_OMAP
 330         bool "TI OMAP"
 331         help
 332           Support for TI's OMAP platform (OMAP1 and OMAP2).
 333
 334 endchoice
 335
 336 source "arch/arm/mach-clps711x/Kconfig"
 337
 338 source "arch/arm/mach-ep93xx/Kconfig"
 339
 340 source "arch/arm/mach-footbridge/Kconfig"
 341
 342 source "arch/arm/mach-integrator/Kconfig"
 343
 344 source "arch/arm/mach-iop32x/Kconfig"
 345
 346 source "arch/arm/mach-iop33x/Kconfig"
 347
 348 source "arch/arm/mach-iop13xx/Kconfig"
 349
 350 source "arch/arm/mach-ixp4xx/Kconfig"
 351
 352 source "arch/arm/mach-ixp2000/Kconfig"
 353
 354 source "arch/arm/mach-ixp23xx/Kconfig"
 355
 356 source "arch/arm/mach-pxa/Kconfig"
 357
 358 source "arch/arm/mach-sa1100/Kconfig"
 359
 360 source "arch/arm/plat-omap/Kconfig"
 361
 362 source "arch/arm/mach-omap1/Kconfig"
 363
 364 source "arch/arm/mach-omap2/Kconfig"
 365
 366 source "arch/arm/mach-s3c2410/Kconfig"
 367
 368 source "arch/arm/mach-lh7a40x/Kconfig"
 369
 370 source "arch/arm/mach-imx/Kconfig"
 371
 372 source "arch/arm/mach-h720x/Kconfig"
 373
 374 source "arch/arm/mach-versatile/Kconfig"
 375
 376 source "arch/arm/mach-aaec2000/Kconfig"
 377
 378 source "arch/arm/mach-realview/Kconfig"
 379
 380 source "arch/arm/mach-at91rm9200/Kconfig"
 381
 382 source "arch/arm/mach-netx/Kconfig"
 383
 384 # Definitions to make life easier
 385 config ARCH_ACORN
 386         bool
 387
 388 config PLAT_IOP
 389         bool
 390
 391 source arch/arm/mm/Kconfig
 392
 393 config IWMMXT
 394         bool "Enable iWMMXt support"
 395         depends CPU_XSCALE || CPU_XSC3
 396         default y if PXA27x
 397         help
 398           Enable support for iWMMXt context switching at run time if
 399           running on a CPU that supports it.
 400
 401 #  bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
 402 config XSCALE_PMU
 403         bool
 404         depends on CPU_XSCALE && !XSCALE_PMU_TIMER
 405         default y
 406
 407 if !MMU
 408 source "arch/arm/Kconfig-nommu"
 409 endif
 410
 411 endmenu
 412
 413 source "arch/arm/common/Kconfig"
 414
 415 config FORCE_MAX_ZONEORDER
 416         int
 417         depends on SA1111
 418         default "9"
 419
 420 menu "Bus support"
 421
 422 config ARM_AMBA
 423         bool
 424
 425 config ISA
 426         bool
 427         help
 428           Find out whether you have ISA slots on your motherboard.  ISA is the
 429           name of a bus system, i.e. the way the CPU talks to the other stuff
 430           inside your box.  Other bus systems are PCI, EISA, MicroChannel
 431           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
 432           newer boards don't support it.  If you have ISA, say Y, otherwise N.
 433
 434 # Select ISA DMA controller support
 435 config ISA_DMA
 436         bool
 437         select ISA_DMA_API
 438
 439 # Select ISA DMA interface
 440 config ISA_DMA_API
 441         bool
 442
 443 config PCI
 444         bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX
 445         help
 446           Find out whether you have a PCI motherboard. PCI is the name of a
 447           bus system, i.e. the way the CPU talks to the other stuff inside
 448           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 449           VESA. If you have PCI, say Y, otherwise N.
 450
 451           The PCI-HOWTO, available from
 452           <http://www.tldp.org/docs.html#howto>, contains valuable
 453           information about which PCI hardware does work under Linux and which
 454           doesn't.
 455
 456 # Select the host bridge type
 457 config PCI_HOST_VIA82C505
 458         bool
 459         depends on PCI && ARCH_SHARK
 460         default y
 461
 462 source "drivers/pci/Kconfig"
 463
 464 source "drivers/pcmcia/Kconfig"
 465
 466 endmenu
 467
 468 menu "Kernel Features"
 469
 470 config SMP
 471         bool "Symmetric Multi-Processing (EXPERIMENTAL)"
 472         depends on EXPERIMENTAL && REALVIEW_MPCORE
 473         help
 474           This enables support for systems with more than one CPU. If you have
 475           a system with only one CPU, like most personal computers, say N. If
 476           you have a system with more than one CPU, say Y.
 477
 478           If you say N here, the kernel will run on single and multiprocessor
 479           machines, but will use only one CPU of a multiprocessor machine. If
 480           you say Y here, the kernel will run on many, but not all, single
 481           processor machines. On a single processor machine, the kernel will
 482           run faster if you say N here.
 483
 484           See also the <file:Documentation/smp.txt>,
 485           <file:Documentation/i386/IO-APIC.txt>,
 486           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 487           <http://www.linuxdoc.org/docs.html#howto>.
 488
 489           If you don't know what to do here, say N.
 490
 491 config NR_CPUS
 492         int "Maximum number of CPUs (2-32)"
 493         range 2 32
 494         depends on SMP
 495         default "4"
 496
 497 config HOTPLUG_CPU
 498         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 499         depends on SMP && HOTPLUG && EXPERIMENTAL
 500         help
 501           Say Y here to experiment with turning CPUs off and on.  CPUs
 502           can be controlled through /sys/devices/system/cpu.
 503
 504 config LOCAL_TIMERS
 505         bool "Use local timer interrupts"
 506         depends on SMP && REALVIEW_MPCORE
 507         default y
 508         help
 509           Enable support for local timers on SMP platforms, rather then the
 510           legacy IPI broadcast method.  Local timers allows the system
 511           accounting to be spread across the timer interval, preventing a
 512           "thundering herd" at every timer tick.
 513
 514 config PREEMPT
 515         bool "Preemptible Kernel (EXPERIMENTAL)"
 516         depends on EXPERIMENTAL
 517         help
 518           This option reduces the latency of the kernel when reacting to
 519           real-time or interactive events by allowing a low priority process to
 520           be preempted even if it is in kernel mode executing a system call.
 521           This allows applications to run more reliably even when the system is
 522           under load.
 523
 524           Say Y here if you are building a kernel for a desktop, embedded
 525           or real-time system.  Say N if you are unsure.
 526
 527 config NO_IDLE_HZ
 528         bool "Dynamic tick timer"
 529         help
 530           Select this option if you want to disable continuous timer ticks
 531           and have them programmed to occur as required. This option saves
 532           power as the system can remain in idle state for longer.
 533
 534           By default dynamic tick is disabled during the boot, and can be
 535           manually enabled with:
 536
 537             echo 1 > /sys/devices/system/timer/timer0/dyn_tick
 538
 539           Alternatively, if you want dynamic tick automatically enabled
 540           during boot, pass "dyntick=enable" via the kernel command string.
 541
 542           Please note that dynamic tick may affect the accuracy of
 543           timekeeping on some platforms depending on the implementation.
 544           Currently at least OMAP, PXA2xx and SA11x0 platforms are known
 545           to have accurate timekeeping with dynamic tick.
 546
 547 config HZ
 548         int
 549         default 128 if ARCH_L7200
 550         default 200 if ARCH_EBSA110 || ARCH_S3C2410
 551         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
 552         default 100
 553
 554 config AEABI
 555         bool "Use the ARM EABI to compile the kernel"
 556         help
 557           This option allows for the kernel to be compiled using the latest
 558           ARM ABI (aka EABI).  This is only useful if you are using a user
 559           space environment that is also compiled with EABI.
 560
 561           Since there are major incompatibilities between the legacy ABI and
 562           EABI, especially with regard to structure member alignment, this
 563           option also changes the kernel syscall calling convention to
 564           disambiguate both ABIs and allow for backward compatibility support
 565           (selected with CONFIG_OABI_COMPAT).
 566
 567           To use this you need GCC version 4.0.0 or later.
 568
 569 config OABI_COMPAT
 570         bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
 571         depends on AEABI && EXPERIMENTAL
 572         default y
 573         help
 574           This option preserves the old syscall interface along with the
 575           new (ARM EABI) one. It also provides a compatibility layer to
 576           intercept syscalls that have structure arguments which layout
 577           in memory differs between the legacy ABI and the new ARM EABI
 578           (only for non "thumb" binaries). This option adds a tiny
 579           overhead to all syscalls and produces a slightly larger kernel.
 580           If you know you'll be using only pure EABI user space then you
 581           can say N here. If this option is not selected and you attempt
 582           to execute a legacy ABI binary then the result will be
 583           UNPREDICTABLE (in fact it can be predicted that it won't work
 584           at all). If in doubt say Y.
 585
 586 config ARCH_DISCONTIGMEM_ENABLE
 587         bool
 588         default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
 589         help
 590           Say Y to support efficient handling of discontiguous physical memory,
 591           for architectures which are either NUMA (Non-Uniform Memory Access)
 592           or have huge holes in the physical address space for other reasons.
 593           See <file:Documentation/vm/numa> for more.
 594
 595 config NODES_SHIFT
 596         int
 597         default "4" if ARCH_LH7A40X
 598         default "2"
 599         depends on NEED_MULTIPLE_NODES
 600
 601 source "mm/Kconfig"
 602
 603 config LEDS
 604         bool "Timer and CPU usage LEDs"
 605         depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
 606                    ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
 607                    ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
 608                    ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
 609                    ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
 610                    ARCH_AT91 || MACH_TRIZEPS4
 611         help
 612           If you say Y here, the LEDs on your machine will be used
 613           to provide useful information about your current system status.
 614
 615           If you are compiling a kernel for a NetWinder or EBSA-285, you will
 616           be able to select which LEDs are active using the options below. If
 617           you are compiling a kernel for the EBSA-110 or the LART however, the
 618           red LED will simply flash regularly to indicate that the system is
 619           still functional. It is safe to say Y here if you have a CATS
 620           system, but the driver will do nothing.
 621
 622 config LEDS_TIMER
 623         bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
 624                             MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
 625         depends on LEDS
 626         default y if ARCH_EBSA110
 627         help
 628           If you say Y here, one of the system LEDs (the green one on the
 629           NetWinder, the amber one on the EBSA285, or the red one on the LART)
 630           will flash regularly to indicate that the system is still
 631           operational. This is mainly useful to kernel hackers who are
 632           debugging unstable kernels.
 633
 634           The LART uses the same LED for both Timer LED and CPU usage LED
 635           functions. You may choose to use both, but the Timer LED function
 636           will overrule the CPU usage LED.
 637
 638 config LEDS_CPU
 639         bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
 640                         !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
 641         depends on LEDS
 642         help
 643           If you say Y here, the red LED will be used to give a good real
 644           time indication of CPU usage, by lighting whenever the idle task
 645           is not currently executing.
 646
 647           The LART uses the same LED for both Timer LED and CPU usage LED
 648           functions. You may choose to use both, but the Timer LED function
 649           will overrule the CPU usage LED.
 650
 651 config ALIGNMENT_TRAP
 652         bool
 653         depends on CPU_CP15_MMU
 654         default y if !ARCH_EBSA110
 655         help
 656           ARM processors cannot fetch/store information which is not
 657           naturally aligned on the bus, i.e., a 4 byte fetch must start at an
 658           address divisible by 4. On 32-bit ARM processors, these non-aligned
 659           fetch/store instructions will be emulated in software if you say
 660           here, which has a severe performance impact. This is necessary for
 661           correct operation of some network protocols. With an IP-only
 662           configuration it is safe to say N, otherwise say Y.
 663
 664 endmenu
 665
 666 menu "Boot options"
 667
 668 # Compressed boot loader in ROM.  Yes, we really want to ask about
 669 # TEXT and BSS so we preserve their values in the config files.
 670 config ZBOOT_ROM_TEXT
 671         hex "Compressed ROM boot loader base address"
 672         default "0"
 673         help
 674           The physical address at which the ROM-able zImage is to be
 675           placed in the target.  Platforms which normally make use of
 676           ROM-able zImage formats normally set this to a suitable
 677           value in their defconfig file.
 678
 679           If ZBOOT_ROM is not enabled, this has no effect.
 680
 681 config ZBOOT_ROM_BSS
 682         hex "Compressed ROM boot loader BSS address"
 683         default "0"
 684         help
 685           The base address of an area of read/write memory in the target
 686           for the ROM-able zImage which must be available while the
 687           decompressor is running. It must be large enough to hold the
 688           entire decompressed kernel plus an additional 128 KiB.
 689           Platforms which normally make use of ROM-able zImage formats
 690           normally set this to a suitable value in their defconfig file.
 691
 692           If ZBOOT_ROM is not enabled, this has no effect.
 693
 694 config ZBOOT_ROM
 695         bool "Compressed boot loader in ROM/flash"
 696         depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
 697         help
 698           Say Y here if you intend to execute your compressed kernel image
 699           (zImage) directly from ROM or flash.  If unsure, say N.
 700
 701 config CMDLINE
 702         string "Default kernel command string"
 703         default ""
 704         help
 705           On some architectures (EBSA110 and CATS), there is currently no way
 706           for the boot loader to pass arguments to the kernel. For these
 707           architectures, you should supply some command-line options at build
 708           time by entering them here. As a minimum, you should specify the
 709           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 710
 711 config XIP_KERNEL
 712         bool "Kernel Execute-In-Place from ROM"
 713         depends on !ZBOOT_ROM
 714         help
 715           Execute-In-Place allows the kernel to run from non-volatile storage
 716           directly addressable by the CPU, such as NOR flash. This saves RAM
 717           space since the text section of the kernel is not loaded from flash
 718           to RAM.  Read-write sections, such as the data section and stack,
 719           are still copied to RAM.  The XIP kernel is not compressed since
 720           it has to run directly from flash, so it will take more space to
 721           store it.  The flash address used to link the kernel object files,
 722           and for storing it, is configuration dependent. Therefore, if you
 723           say Y here, you must know the proper physical address where to
 724           store the kernel image depending on your own flash memory usage.
 725
 726           Also note that the make target becomes "make xipImage" rather than
 727           "make zImage" or "make Image".  The final kernel binary to put in
 728           ROM memory will be arch/arm/boot/xipImage.
 729
 730           If unsure, say N.
 731
 732 config XIP_PHYS_ADDR
 733         hex "XIP Kernel Physical Location"
 734         depends on XIP_KERNEL
 735         default "0x00080000"
 736         help
 737           This is the physical address in your flash memory the kernel will
 738           be linked for and stored to.  This address is dependent on your
 739           own flash usage.
 740
 741 endmenu
 742
 743 if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX )
 744
 745 menu "CPU Frequency scaling"
 746
 747 source "drivers/cpufreq/Kconfig"
 748
 749 config CPU_FREQ_SA1100
 750         bool
 751         depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
 752         default y
 753
 754 config CPU_FREQ_SA1110
 755         bool
 756         depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
 757         default y
 758
 759 config CPU_FREQ_INTEGRATOR
 760         tristate "CPUfreq driver for ARM Integrator CPUs"
 761         depends on ARCH_INTEGRATOR && CPU_FREQ
 762         default y
 763         help
 764           This enables the CPUfreq driver for ARM Integrator CPUs.
 765
 766           For details, take a look at <file:Documentation/cpu-freq>.
 767
 768           If in doubt, say Y.
 769
 770 config CPU_FREQ_IMX
 771         tristate "CPUfreq driver for i.MX CPUs"
 772         depends on ARCH_IMX && CPU_FREQ
 773         default n
 774         help
 775           This enables the CPUfreq driver for i.MX CPUs.
 776
 777           If in doubt, say N.
 778
 779 endmenu
 780
 781 endif
 782
 783 menu "Floating point emulation"
 784
 785 comment "At least one emulation must be selected"
 786
 787 config FPE_NWFPE
 788         bool "NWFPE math emulation"
 789         depends on !AEABI || OABI_COMPAT
 790         ---help---
 791           Say Y to include the NWFPE floating point emulator in the kernel.
 792           This is necessary to run most binaries. Linux does not currently
 793           support floating point hardware so you need to say Y here even if
 794           your machine has an FPA or floating point co-processor podule.
 795
 796           You may say N here if you are going to load the Acorn FPEmulator
 797           early in the bootup.
 798
 799 config FPE_NWFPE_XP
 800         bool "Support extended precision"
 801         depends on FPE_NWFPE
 802         help
 803           Say Y to include 80-bit support in the kernel floating-point
 804           emulator.  Otherwise, only 32 and 64-bit support is compiled in.
 805           Note that gcc does not generate 80-bit operations by default,
 806           so in most cases this option only enlarges the size of the
 807           floating point emulator without any good reason.
 808
 809           You almost surely want to say N here.
 810
 811 config FPE_FASTFPE
 812         bool "FastFPE math emulation (EXPERIMENTAL)"
 813         depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
 814         ---help---
 815           Say Y here to include the FAST floating point emulator in the kernel.
 816           This is an experimental much faster emulator which now also has full
 817           precision for the mantissa.  It does not support any exceptions.
 818           It is very simple, and approximately 3-6 times faster than NWFPE.
 819
 820           It should be sufficient for most programs.  It may be not suitable
 821           for scientific calculations, but you have to check this for yourself.
 822           If you do not feel you need a faster FP emulation you should better
 823           choose NWFPE.
 824
 825 config VFP
 826         bool "VFP-format floating point maths"
 827         depends on CPU_V6 || CPU_ARM926T
 828         help
 829           Say Y to include VFP support code in the kernel. This is needed
 830           if your hardware includes a VFP unit.
 831
 832           Please see <file:Documentation/arm/VFP/release-notes.txt> for
 833           release notes and additional status information.
 834
 835           Say N if your target does not have VFP hardware.
 836
 837 endmenu
 838
 839 menu "Userspace binary formats"
 840
 841 source "fs/Kconfig.binfmt"
 842
 843 config ARTHUR
 844         tristate "RISC OS personality"
 845         depends on !AEABI
 846         help
 847           Say Y here to include the kernel code necessary if you want to run
 848           Acorn RISC OS/Arthur binaries under Linux. This code is still very
 849           experimental; if this sounds frightening, say N and sleep in peace.
 850           You can also say M here to compile this support as a module (which
 851           will be called arthur).
 852
 853 endmenu
 854
 855 menu "Power management options"
 856
 857 source "kernel/power/Kconfig"
 858
 859 config APM
 860         tristate "Advanced Power Management Emulation"
 861         ---help---
 862           APM is a BIOS specification for saving power using several different
 863           techniques. This is mostly useful for battery powered laptops with
 864           APM compliant BIOSes. If you say Y here, the system time will be
 865           reset after a RESUME operation, the /proc/apm device will provide
 866           battery status information, and user-space programs will receive
 867           notification of APM "events" (e.g. battery status change).
 868
 869           In order to use APM, you will need supporting software. For location
 870           and more information, read <file:Documentation/pm.txt> and the
 871           Battery Powered Linux mini-HOWTO, available from
 872           <http://www.tldp.org/docs.html#howto>.
 873
 874           This driver does not spin down disk drives (see the hdparm(8)
 875           manpage ("man 8 hdparm") for that), and it doesn't turn off
 876           VESA-compliant "green" monitors.
 877
 878           Generally, if you don't have a battery in your machine, there isn't
 879           much point in using this driver and you should say N. If you get
 880           random kernel OOPSes or reboots that don't seem to be related to
 881           anything, try disabling/enabling this option (or disabling/enabling
 882           APM in your BIOS).
 883
 884 endmenu
 885
 886 source "net/Kconfig"
 887
 888 menu "Device Drivers"
 889
 890 source "drivers/base/Kconfig"
 891
 892 source "drivers/connector/Kconfig"
 893
 894 if ALIGNMENT_TRAP || !CPU_CP15_MMU
 895 source "drivers/mtd/Kconfig"
 896 endif
 897
 898 source "drivers/parport/Kconfig"
 899
 900 source "drivers/pnp/Kconfig"
 901
 902 source "drivers/block/Kconfig"
 903
 904 source "drivers/acorn/block/Kconfig"
 905
 906 if PCMCIA || ARCH_CLPS7500 || ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX \
 907         || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
 908         || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
 909         || ARCH_IXP23XX
 910 source "drivers/ide/Kconfig"
 911 endif
 912
 913 source "drivers/scsi/Kconfig"
 914
 915 source "drivers/ata/Kconfig"
 916
 917 source "drivers/md/Kconfig"
 918
 919 source "drivers/message/fusion/Kconfig"
 920
 921 source "drivers/ieee1394/Kconfig"
 922
 923 source "drivers/message/i2o/Kconfig"
 924
 925 source "drivers/net/Kconfig"
 926
 927 source "drivers/isdn/Kconfig"
 928
 929 # input before char - char/joystick depends on it. As does USB.
 930
 931 source "drivers/input/Kconfig"
 932
 933 source "drivers/char/Kconfig"
 934
 935 source "drivers/i2c/Kconfig"
 936
 937 source "drivers/spi/Kconfig"
 938
 939 source "drivers/w1/Kconfig"
 940
 941 source "drivers/hwmon/Kconfig"
 942
 943 #source "drivers/l3/Kconfig"
 944
 945 source "drivers/misc/Kconfig"
 946
 947 source "drivers/mfd/Kconfig"
 948
 949 source "drivers/leds/Kconfig"
 950
 951 source "drivers/media/Kconfig"
 952
 953 source "drivers/video/Kconfig"
 954
 955 source "sound/Kconfig"
 956
 957 source "drivers/hid/Kconfig"
 958
 959 source "drivers/usb/Kconfig"
 960
 961 source "drivers/mmc/Kconfig"
 962
 963 source "drivers/rtc/Kconfig"
 964
 965 endmenu
 966
 967 source "fs/Kconfig"
 968
 969 source "arch/arm/oprofile/Kconfig"
 970
 971 source "arch/arm/Kconfig.debug"
 972
 973 source "security/Kconfig"
 974
 975 source "crypto/Kconfig"
 976
 977 source "lib/Kconfig"