Kconfig 24 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see Documentation/kbuild/kconfig-language.txt.
  4. #
  5. mainmenu "Linux Kernel Configuration"
  6. config ARM
  7. bool
  8. default y
  9. help
  10. The ARM series is a line of low-power-consumption RISC chip designs
  11. licensed by ARM Ltd and targeted at embedded applications and
  12. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  13. manufactured, but legacy ARM-based PC hardware remains popular in
  14. Europe. There is an ARM Linux project with a web page at
  15. <http://www.arm.linux.org.uk/>.
  16. config MMU
  17. bool
  18. default y
  19. config EISA
  20. bool
  21. ---help---
  22. The Extended Industry Standard Architecture (EISA) bus was
  23. developed as an open alternative to the IBM MicroChannel bus.
  24. The EISA bus provided some of the features of the IBM MicroChannel
  25. bus while maintaining backward compatibility with cards made for
  26. the older ISA bus. The EISA bus saw limited use between 1988 and
  27. 1995 when it was made obsolete by the PCI bus.
  28. Say Y here if you are building a kernel for an EISA-based machine.
  29. Otherwise, say N.
  30. config SBUS
  31. bool
  32. config MCA
  33. bool
  34. help
  35. MicroChannel Architecture is found in some IBM PS/2 machines and
  36. laptops. It is a bus system similar to PCI or ISA. See
  37. <file:Documentation/mca.txt> (and especially the web page given
  38. there) before attempting to build an MCA bus kernel.
  39. config RWSEM_GENERIC_SPINLOCK
  40. bool
  41. default y
  42. config RWSEM_XCHGADD_ALGORITHM
  43. bool
  44. config GENERIC_CALIBRATE_DELAY
  45. bool
  46. default y
  47. config GENERIC_BUST_SPINLOCK
  48. bool
  49. config ARCH_MAY_HAVE_PC_FDC
  50. bool
  51. config GENERIC_ISA_DMA
  52. bool
  53. config FIQ
  54. bool
  55. config ARCH_MTD_XIP
  56. bool
  57. source "init/Kconfig"
  58. menu "System Type"
  59. choice
  60. prompt "ARM system type"
  61. default ARCH_VERSATILE
  62. config ARCH_CLPS7500
  63. bool "Cirrus-CL-PS7500FE"
  64. select TIMER_ACORN
  65. select ISA
  66. help
  67. Support for the Cirrus Logic PS7500FE system-on-a-chip.
  68. config ARCH_CLPS711X
  69. bool "CLPS711x/EP721x-based"
  70. help
  71. Support for Cirrus Logic 711x/721x based boards.
  72. config ARCH_CO285
  73. bool "Co-EBSA285"
  74. select FOOTBRIDGE
  75. select FOOTBRIDGE_ADDIN
  76. help
  77. Support for Intel's EBSA285 companion chip.
  78. config ARCH_EBSA110
  79. bool "EBSA-110"
  80. select ISA
  81. help
  82. This is an evaluation board for the StrongARM processor available
  83. from Digital. It has limited hardware on-board, including an
  84. Ethernet interface, two PCMCIA sockets, two serial ports and a
  85. parallel port.
  86. config ARCH_EP93XX
  87. bool "EP93xx-based"
  88. select ARM_AMBA
  89. select ARM_VIC
  90. help
  91. This enables support for the Cirrus EP93xx series of CPUs.
  92. config ARCH_FOOTBRIDGE
  93. bool "FootBridge"
  94. select FOOTBRIDGE
  95. help
  96. Support for systems based on the DC21285 companion chip
  97. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  98. config ARCH_INTEGRATOR
  99. bool "Integrator"
  100. select ARM_AMBA
  101. select ICST525
  102. help
  103. Support for ARM's Integrator platform.
  104. config ARCH_IOP3XX
  105. bool "IOP3xx-based"
  106. select PCI
  107. help
  108. Support for Intel's IOP3XX (XScale) family of processors.
  109. config ARCH_IXP4XX
  110. bool "IXP4xx-based"
  111. select DMABOUNCE
  112. select PCI
  113. help
  114. Support for Intel's IXP4XX (XScale) family of processors.
  115. config ARCH_IXP2000
  116. bool "IXP2400/2800-based"
  117. select PCI
  118. help
  119. Support for Intel's IXP2400/2800 (XScale) family of processors.
  120. config ARCH_L7200
  121. bool "LinkUp-L7200"
  122. select FIQ
  123. help
  124. Say Y here if you intend to run this kernel on a LinkUp Systems
  125. L7200 Software Development Board which uses an ARM720T processor.
  126. Information on this board can be obtained at:
  127. <http://www.linkupsys.com/>
  128. If you have any questions or comments about the Linux kernel port
  129. to this board, send e-mail to <sjhill@cotw.com>.
  130. config ARCH_PXA
  131. bool "PXA2xx-based"
  132. select ARCH_MTD_XIP
  133. help
  134. Support for Intel's PXA2XX processor line.
  135. config ARCH_RPC
  136. bool "RiscPC"
  137. select ARCH_ACORN
  138. select FIQ
  139. select TIMER_ACORN
  140. select ARCH_MAY_HAVE_PC_FDC
  141. select ISA_DMA_API
  142. help
  143. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  144. CD-ROM interface, serial and parallel port, and the floppy drive.
  145. config ARCH_SA1100
  146. bool "SA1100-based"
  147. select ISA
  148. select ARCH_DISCONTIGMEM_ENABLE
  149. select ARCH_MTD_XIP
  150. help
  151. Support for StrongARM 11x0 based boards.
  152. config ARCH_S3C2410
  153. bool "Samsung S3C2410"
  154. help
  155. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  156. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  157. the Samsung SMDK2410 development board (and derivatives).
  158. config ARCH_SHARK
  159. bool "Shark"
  160. select ISA
  161. select ISA_DMA
  162. select PCI
  163. help
  164. Support for the StrongARM based Digital DNARD machine, also known
  165. as "Shark" (<http://www.shark-linux.de/shark.html>).
  166. config ARCH_LH7A40X
  167. bool "Sharp LH7A40X"
  168. help
  169. Say Y here for systems based on one of the Sharp LH7A40X
  170. System on a Chip processors. These CPUs include an ARM922T
  171. core with a wide array of integrated devices for
  172. hand-held and low-power applications.
  173. config ARCH_OMAP
  174. bool "TI OMAP"
  175. help
  176. Support for TI's OMAP platform (OMAP1 and OMAP2).
  177. config ARCH_VERSATILE
  178. bool "Versatile"
  179. select ARM_AMBA
  180. select ARM_VIC
  181. select ICST307
  182. help
  183. This enables support for ARM Ltd Versatile board.
  184. config ARCH_REALVIEW
  185. bool "RealView"
  186. select ARM_AMBA
  187. select ICST307
  188. help
  189. This enables support for ARM Ltd RealView boards.
  190. config ARCH_IMX
  191. bool "IMX"
  192. help
  193. Support for Motorola's i.MX family of processors (MX1, MXL).
  194. config ARCH_H720X
  195. bool "Hynix-HMS720x-based"
  196. select ISA_DMA_API
  197. help
  198. This enables support for systems based on the Hynix HMS720x
  199. config ARCH_AAEC2000
  200. bool "Agilent AAEC-2000 based"
  201. select ARM_AMBA
  202. help
  203. This enables support for systems based on the Agilent AAEC-2000
  204. config ARCH_AT91RM9200
  205. bool "AT91RM9200"
  206. help
  207. Say Y here if you intend to run this kernel on an Atmel
  208. AT91RM9200-based board.
  209. endchoice
  210. source "arch/arm/mach-clps711x/Kconfig"
  211. source "arch/arm/mach-ep93xx/Kconfig"
  212. source "arch/arm/mach-footbridge/Kconfig"
  213. source "arch/arm/mach-integrator/Kconfig"
  214. source "arch/arm/mach-iop3xx/Kconfig"
  215. source "arch/arm/mach-ixp4xx/Kconfig"
  216. source "arch/arm/mach-ixp2000/Kconfig"
  217. source "arch/arm/mach-pxa/Kconfig"
  218. source "arch/arm/mach-sa1100/Kconfig"
  219. source "arch/arm/plat-omap/Kconfig"
  220. source "arch/arm/mach-omap1/Kconfig"
  221. source "arch/arm/mach-omap2/Kconfig"
  222. source "arch/arm/mach-s3c2410/Kconfig"
  223. source "arch/arm/mach-lh7a40x/Kconfig"
  224. source "arch/arm/mach-imx/Kconfig"
  225. source "arch/arm/mach-h720x/Kconfig"
  226. source "arch/arm/mach-versatile/Kconfig"
  227. source "arch/arm/mach-aaec2000/Kconfig"
  228. source "arch/arm/mach-realview/Kconfig"
  229. source "arch/arm/mach-at91rm9200/Kconfig"
  230. # Definitions to make life easier
  231. config ARCH_ACORN
  232. bool
  233. source arch/arm/mm/Kconfig
  234. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  235. config XSCALE_PMU
  236. bool
  237. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  238. default y
  239. endmenu
  240. source "arch/arm/common/Kconfig"
  241. config FORCE_MAX_ZONEORDER
  242. int
  243. depends on SA1111
  244. default "9"
  245. menu "Bus support"
  246. config ARM_AMBA
  247. bool
  248. config ISA
  249. bool
  250. help
  251. Find out whether you have ISA slots on your motherboard. ISA is the
  252. name of a bus system, i.e. the way the CPU talks to the other stuff
  253. inside your box. Other bus systems are PCI, EISA, MicroChannel
  254. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  255. newer boards don't support it. If you have ISA, say Y, otherwise N.
  256. # Select ISA DMA controller support
  257. config ISA_DMA
  258. bool
  259. select ISA_DMA_API
  260. # Select ISA DMA interface
  261. config ISA_DMA_API
  262. bool
  263. config PCI
  264. bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB
  265. help
  266. Find out whether you have a PCI motherboard. PCI is the name of a
  267. bus system, i.e. the way the CPU talks to the other stuff inside
  268. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  269. VESA. If you have PCI, say Y, otherwise N.
  270. The PCI-HOWTO, available from
  271. <http://www.tldp.org/docs.html#howto>, contains valuable
  272. information about which PCI hardware does work under Linux and which
  273. doesn't.
  274. # Select the host bridge type
  275. config PCI_HOST_VIA82C505
  276. bool
  277. depends on PCI && ARCH_SHARK
  278. default y
  279. source "drivers/pci/Kconfig"
  280. source "drivers/pcmcia/Kconfig"
  281. endmenu
  282. menu "Kernel Features"
  283. config SMP
  284. bool "Symmetric Multi-Processing (EXPERIMENTAL)"
  285. depends on EXPERIMENTAL && REALVIEW_MPCORE
  286. help
  287. This enables support for systems with more than one CPU. If you have
  288. a system with only one CPU, like most personal computers, say N. If
  289. you have a system with more than one CPU, say Y.
  290. If you say N here, the kernel will run on single and multiprocessor
  291. machines, but will use only one CPU of a multiprocessor machine. If
  292. you say Y here, the kernel will run on many, but not all, single
  293. processor machines. On a single processor machine, the kernel will
  294. run faster if you say N here.
  295. See also the <file:Documentation/smp.txt>,
  296. <file:Documentation/i386/IO-APIC.txt>,
  297. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  298. <http://www.linuxdoc.org/docs.html#howto>.
  299. If you don't know what to do here, say N.
  300. config NR_CPUS
  301. int "Maximum number of CPUs (2-32)"
  302. range 2 32
  303. depends on SMP
  304. default "4"
  305. config HOTPLUG_CPU
  306. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  307. depends on SMP && HOTPLUG && EXPERIMENTAL
  308. help
  309. Say Y here to experiment with turning CPUs off and on. CPUs
  310. can be controlled through /sys/devices/system/cpu.
  311. config LOCAL_TIMERS
  312. bool "Use local timer interrupts"
  313. depends on SMP && REALVIEW_MPCORE
  314. default y
  315. help
  316. Enable support for local timers on SMP platforms, rather then the
  317. legacy IPI broadcast method. Local timers allows the system
  318. accounting to be spread across the timer interval, preventing a
  319. "thundering herd" at every timer tick.
  320. config PREEMPT
  321. bool "Preemptible Kernel (EXPERIMENTAL)"
  322. depends on EXPERIMENTAL
  323. help
  324. This option reduces the latency of the kernel when reacting to
  325. real-time or interactive events by allowing a low priority process to
  326. be preempted even if it is in kernel mode executing a system call.
  327. This allows applications to run more reliably even when the system is
  328. under load.
  329. Say Y here if you are building a kernel for a desktop, embedded
  330. or real-time system. Say N if you are unsure.
  331. config NO_IDLE_HZ
  332. bool "Dynamic tick timer"
  333. help
  334. Select this option if you want to disable continuous timer ticks
  335. and have them programmed to occur as required. This option saves
  336. power as the system can remain in idle state for longer.
  337. By default dynamic tick is disabled during the boot, and can be
  338. manually enabled with:
  339. echo 1 > /sys/devices/system/timer/timer0/dyn_tick
  340. Alternatively, if you want dynamic tick automatically enabled
  341. during boot, pass "dyntick=enable" via the kernel command string.
  342. Please note that dynamic tick may affect the accuracy of
  343. timekeeping on some platforms depending on the implementation.
  344. Currently at least OMAP, PXA2xx and SA11x0 platforms are known
  345. to have accurate timekeeping with dynamic tick.
  346. config HZ
  347. int
  348. default 128 if ARCH_L7200
  349. default 200 if ARCH_EBSA110 || ARCH_S3C2410
  350. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  351. default 100
  352. config AEABI
  353. bool "Use the ARM EABI to compile the kernel"
  354. help
  355. This option allows for the kernel to be compiled using the latest
  356. ARM ABI (aka EABI). This is only useful if you are using a user
  357. space environment that is also compiled with EABI.
  358. Since there are major incompatibilities between the legacy ABI and
  359. EABI, especially with regard to structure member alignment, this
  360. option also changes the kernel syscall calling convention to
  361. disambiguate both ABIs and allow for backward compatibility support
  362. (selected with CONFIG_OABI_COMPAT).
  363. To use this you need GCC version 4.0.0 or later.
  364. config OABI_COMPAT
  365. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  366. depends on AEABI && EXPERIMENTAL
  367. default y
  368. help
  369. This option preserves the old syscall interface along with the
  370. new (ARM EABI) one. It also provides a compatibility layer to
  371. intercept syscalls that have structure arguments which layout
  372. in memory differs between the legacy ABI and the new ARM EABI
  373. (only for non "thumb" binaries). This option adds a tiny
  374. overhead to all syscalls and produces a slightly larger kernel.
  375. If you know you'll be using only pure EABI user space then you
  376. can say N here. If this option is not selected and you attempt
  377. to execute a legacy ABI binary then the result will be
  378. UNPREDICTABLE (in fact it can be predicted that it won't work
  379. at all). If in doubt say Y.
  380. config ARCH_DISCONTIGMEM_ENABLE
  381. bool
  382. default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
  383. help
  384. Say Y to support efficient handling of discontiguous physical memory,
  385. for architectures which are either NUMA (Non-Uniform Memory Access)
  386. or have huge holes in the physical address space for other reasons.
  387. See <file:Documentation/vm/numa> for more.
  388. source "mm/Kconfig"
  389. config LEDS
  390. bool "Timer and CPU usage LEDs"
  391. depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
  392. ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
  393. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  394. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  395. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  396. ARCH_AT91RM9200
  397. help
  398. If you say Y here, the LEDs on your machine will be used
  399. to provide useful information about your current system status.
  400. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  401. be able to select which LEDs are active using the options below. If
  402. you are compiling a kernel for the EBSA-110 or the LART however, the
  403. red LED will simply flash regularly to indicate that the system is
  404. still functional. It is safe to say Y here if you have a CATS
  405. system, but the driver will do nothing.
  406. config LEDS_TIMER
  407. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  408. MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
  409. depends on LEDS
  410. default y if ARCH_EBSA110
  411. help
  412. If you say Y here, one of the system LEDs (the green one on the
  413. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  414. will flash regularly to indicate that the system is still
  415. operational. This is mainly useful to kernel hackers who are
  416. debugging unstable kernels.
  417. The LART uses the same LED for both Timer LED and CPU usage LED
  418. functions. You may choose to use both, but the Timer LED function
  419. will overrule the CPU usage LED.
  420. config LEDS_CPU
  421. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  422. !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
  423. depends on LEDS
  424. help
  425. If you say Y here, the red LED will be used to give a good real
  426. time indication of CPU usage, by lighting whenever the idle task
  427. is not currently executing.
  428. The LART uses the same LED for both Timer LED and CPU usage LED
  429. functions. You may choose to use both, but the Timer LED function
  430. will overrule the CPU usage LED.
  431. config ALIGNMENT_TRAP
  432. bool
  433. default y if !ARCH_EBSA110
  434. help
  435. ARM processors can not fetch/store information which is not
  436. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  437. address divisible by 4. On 32-bit ARM processors, these non-aligned
  438. fetch/store instructions will be emulated in software if you say
  439. here, which has a severe performance impact. This is necessary for
  440. correct operation of some network protocols. With an IP-only
  441. configuration it is safe to say N, otherwise say Y.
  442. endmenu
  443. menu "Boot options"
  444. # Compressed boot loader in ROM. Yes, we really want to ask about
  445. # TEXT and BSS so we preserve their values in the config files.
  446. config ZBOOT_ROM_TEXT
  447. hex "Compressed ROM boot loader base address"
  448. default "0"
  449. help
  450. The physical address at which the ROM-able zImage is to be
  451. placed in the target. Platforms which normally make use of
  452. ROM-able zImage formats normally set this to a suitable
  453. value in their defconfig file.
  454. If ZBOOT_ROM is not enabled, this has no effect.
  455. config ZBOOT_ROM_BSS
  456. hex "Compressed ROM boot loader BSS address"
  457. default "0"
  458. help
  459. The base address of 64KiB of read/write memory in the target
  460. for the ROM-able zImage, which must be available while the
  461. decompressor is running. Platforms which normally make use of
  462. ROM-able zImage formats normally set this to a suitable
  463. value in their defconfig file.
  464. If ZBOOT_ROM is not enabled, this has no effect.
  465. config ZBOOT_ROM
  466. bool "Compressed boot loader in ROM/flash"
  467. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  468. help
  469. Say Y here if you intend to execute your compressed kernel image
  470. (zImage) directly from ROM or flash. If unsure, say N.
  471. config CMDLINE
  472. string "Default kernel command string"
  473. default ""
  474. help
  475. On some architectures (EBSA110 and CATS), there is currently no way
  476. for the boot loader to pass arguments to the kernel. For these
  477. architectures, you should supply some command-line options at build
  478. time by entering them here. As a minimum, you should specify the
  479. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  480. config XIP_KERNEL
  481. bool "Kernel Execute-In-Place from ROM"
  482. depends on !ZBOOT_ROM
  483. help
  484. Execute-In-Place allows the kernel to run from non-volatile storage
  485. directly addressable by the CPU, such as NOR flash. This saves RAM
  486. space since the text section of the kernel is not loaded from flash
  487. to RAM. Read-write sections, such as the data section and stack,
  488. are still copied to RAM. The XIP kernel is not compressed since
  489. it has to run directly from flash, so it will take more space to
  490. store it. The flash address used to link the kernel object files,
  491. and for storing it, is configuration dependent. Therefore, if you
  492. say Y here, you must know the proper physical address where to
  493. store the kernel image depending on your own flash memory usage.
  494. Also note that the make target becomes "make xipImage" rather than
  495. "make zImage" or "make Image". The final kernel binary to put in
  496. ROM memory will be arch/arm/boot/xipImage.
  497. If unsure, say N.
  498. config XIP_PHYS_ADDR
  499. hex "XIP Kernel Physical Location"
  500. depends on XIP_KERNEL
  501. default "0x00080000"
  502. help
  503. This is the physical address in your flash memory the kernel will
  504. be linked for and stored to. This address is dependent on your
  505. own flash usage.
  506. endmenu
  507. if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)
  508. menu "CPU Frequency scaling"
  509. source "drivers/cpufreq/Kconfig"
  510. config CPU_FREQ_SA1100
  511. bool
  512. depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
  513. default y
  514. config CPU_FREQ_SA1110
  515. bool
  516. depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
  517. default y
  518. config CPU_FREQ_INTEGRATOR
  519. tristate "CPUfreq driver for ARM Integrator CPUs"
  520. depends on ARCH_INTEGRATOR && CPU_FREQ
  521. default y
  522. help
  523. This enables the CPUfreq driver for ARM Integrator CPUs.
  524. For details, take a look at <file:Documentation/cpu-freq>.
  525. If in doubt, say Y.
  526. endmenu
  527. endif
  528. menu "Floating point emulation"
  529. comment "At least one emulation must be selected"
  530. config FPE_NWFPE
  531. bool "NWFPE math emulation"
  532. depends on !AEABI || OABI_COMPAT
  533. ---help---
  534. Say Y to include the NWFPE floating point emulator in the kernel.
  535. This is necessary to run most binaries. Linux does not currently
  536. support floating point hardware so you need to say Y here even if
  537. your machine has an FPA or floating point co-processor podule.
  538. You may say N here if you are going to load the Acorn FPEmulator
  539. early in the bootup.
  540. config FPE_NWFPE_XP
  541. bool "Support extended precision"
  542. depends on FPE_NWFPE
  543. help
  544. Say Y to include 80-bit support in the kernel floating-point
  545. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  546. Note that gcc does not generate 80-bit operations by default,
  547. so in most cases this option only enlarges the size of the
  548. floating point emulator without any good reason.
  549. You almost surely want to say N here.
  550. config FPE_FASTFPE
  551. bool "FastFPE math emulation (EXPERIMENTAL)"
  552. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  553. ---help---
  554. Say Y here to include the FAST floating point emulator in the kernel.
  555. This is an experimental much faster emulator which now also has full
  556. precision for the mantissa. It does not support any exceptions.
  557. It is very simple, and approximately 3-6 times faster than NWFPE.
  558. It should be sufficient for most programs. It may be not suitable
  559. for scientific calculations, but you have to check this for yourself.
  560. If you do not feel you need a faster FP emulation you should better
  561. choose NWFPE.
  562. config VFP
  563. bool "VFP-format floating point maths"
  564. depends on CPU_V6 || CPU_ARM926T
  565. help
  566. Say Y to include VFP support code in the kernel. This is needed
  567. if your hardware includes a VFP unit.
  568. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  569. release notes and additional status information.
  570. Say N if your target does not have VFP hardware.
  571. endmenu
  572. menu "Userspace binary formats"
  573. source "fs/Kconfig.binfmt"
  574. config ARTHUR
  575. tristate "RISC OS personality"
  576. depends on !AEABI
  577. help
  578. Say Y here to include the kernel code necessary if you want to run
  579. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  580. experimental; if this sounds frightening, say N and sleep in peace.
  581. You can also say M here to compile this support as a module (which
  582. will be called arthur).
  583. endmenu
  584. menu "Power management options"
  585. source "kernel/power/Kconfig"
  586. config APM
  587. tristate "Advanced Power Management Emulation"
  588. ---help---
  589. APM is a BIOS specification for saving power using several different
  590. techniques. This is mostly useful for battery powered laptops with
  591. APM compliant BIOSes. If you say Y here, the system time will be
  592. reset after a RESUME operation, the /proc/apm device will provide
  593. battery status information, and user-space programs will receive
  594. notification of APM "events" (e.g. battery status change).
  595. In order to use APM, you will need supporting software. For location
  596. and more information, read <file:Documentation/pm.txt> and the
  597. Battery Powered Linux mini-HOWTO, available from
  598. <http://www.tldp.org/docs.html#howto>.
  599. This driver does not spin down disk drives (see the hdparm(8)
  600. manpage ("man 8 hdparm") for that), and it doesn't turn off
  601. VESA-compliant "green" monitors.
  602. Generally, if you don't have a battery in your machine, there isn't
  603. much point in using this driver and you should say N. If you get
  604. random kernel OOPSes or reboots that don't seem to be related to
  605. anything, try disabling/enabling this option (or disabling/enabling
  606. APM in your BIOS).
  607. endmenu
  608. source "net/Kconfig"
  609. menu "Device Drivers"
  610. source "drivers/base/Kconfig"
  611. source "drivers/connector/Kconfig"
  612. if ALIGNMENT_TRAP
  613. source "drivers/mtd/Kconfig"
  614. endif
  615. source "drivers/parport/Kconfig"
  616. source "drivers/pnp/Kconfig"
  617. source "drivers/block/Kconfig"
  618. source "drivers/acorn/block/Kconfig"
  619. if PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \
  620. || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
  621. || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE
  622. source "drivers/ide/Kconfig"
  623. endif
  624. source "drivers/scsi/Kconfig"
  625. source "drivers/md/Kconfig"
  626. source "drivers/message/fusion/Kconfig"
  627. source "drivers/ieee1394/Kconfig"
  628. source "drivers/message/i2o/Kconfig"
  629. source "drivers/net/Kconfig"
  630. source "drivers/isdn/Kconfig"
  631. # input before char - char/joystick depends on it. As does USB.
  632. source "drivers/input/Kconfig"
  633. source "drivers/char/Kconfig"
  634. source "drivers/i2c/Kconfig"
  635. source "drivers/spi/Kconfig"
  636. source "drivers/w1/Kconfig"
  637. source "drivers/hwmon/Kconfig"
  638. #source "drivers/l3/Kconfig"
  639. source "drivers/misc/Kconfig"
  640. source "drivers/mfd/Kconfig"
  641. source "drivers/media/Kconfig"
  642. source "drivers/video/Kconfig"
  643. source "sound/Kconfig"
  644. source "drivers/usb/Kconfig"
  645. source "drivers/mmc/Kconfig"
  646. endmenu
  647. source "fs/Kconfig"
  648. source "arch/arm/oprofile/Kconfig"
  649. source "arch/arm/Kconfig.debug"
  650. source "security/Kconfig"
  651. source "crypto/Kconfig"
  652. source "lib/Kconfig"