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