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. select RTC_LIB
  10. help
  11. The ARM series is a line of low-power-consumption RISC chip designs
  12. licensed by ARM Ltd and targeted at embedded applications and
  13. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  14. manufactured, but legacy ARM-based PC hardware remains popular in
  15. Europe. There is an ARM Linux project with a web page at
  16. <http://www.arm.linux.org.uk/>.
  17. config MMU
  18. bool
  19. default y
  20. config EISA
  21. bool
  22. ---help---
  23. The Extended Industry Standard Architecture (EISA) bus was
  24. developed as an open alternative to the IBM MicroChannel bus.
  25. The EISA bus provided some of the features of the IBM MicroChannel
  26. bus while maintaining backward compatibility with cards made for
  27. the older ISA bus. The EISA bus saw limited use between 1988 and
  28. 1995 when it was made obsolete by the PCI bus.
  29. Say Y here if you are building a kernel for an EISA-based machine.
  30. Otherwise, say N.
  31. config SBUS
  32. bool
  33. config MCA
  34. bool
  35. help
  36. MicroChannel Architecture is found in some IBM PS/2 machines and
  37. laptops. It is a bus system similar to PCI or ISA. See
  38. <file:Documentation/mca.txt> (and especially the web page given
  39. there) before attempting to build an MCA bus kernel.
  40. config RWSEM_GENERIC_SPINLOCK
  41. bool
  42. default y
  43. config RWSEM_XCHGADD_ALGORITHM
  44. bool
  45. config GENERIC_HWEIGHT
  46. bool
  47. default y
  48. config GENERIC_CALIBRATE_DELAY
  49. bool
  50. default y
  51. config GENERIC_BUST_SPINLOCK
  52. bool
  53. config ARCH_MAY_HAVE_PC_FDC
  54. bool
  55. config GENERIC_ISA_DMA
  56. bool
  57. config FIQ
  58. bool
  59. config ARCH_MTD_XIP
  60. bool
  61. config VECTORS_BASE
  62. hex
  63. default 0xffff0000 if MMU
  64. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  65. default 0x00000000
  66. help
  67. The base address of exception vectors.
  68. source "init/Kconfig"
  69. menu "System Type"
  70. choice
  71. prompt "ARM system type"
  72. default ARCH_VERSATILE
  73. config ARCH_CLPS7500
  74. bool "Cirrus-CL-PS7500FE"
  75. select TIMER_ACORN
  76. select ISA
  77. help
  78. Support for the Cirrus Logic PS7500FE system-on-a-chip.
  79. config ARCH_CLPS711X
  80. bool "CLPS711x/EP721x-based"
  81. help
  82. Support for Cirrus Logic 711x/721x based boards.
  83. config ARCH_CO285
  84. bool "Co-EBSA285"
  85. select FOOTBRIDGE
  86. select FOOTBRIDGE_ADDIN
  87. help
  88. Support for Intel's EBSA285 companion chip.
  89. config ARCH_EBSA110
  90. bool "EBSA-110"
  91. select ISA
  92. help
  93. This is an evaluation board for the StrongARM processor available
  94. from Digital. It has limited hardware on-board, including an
  95. Ethernet interface, two PCMCIA sockets, two serial ports and a
  96. parallel port.
  97. config ARCH_EP93XX
  98. bool "EP93xx-based"
  99. select ARM_AMBA
  100. select ARM_VIC
  101. help
  102. This enables support for the Cirrus EP93xx series of CPUs.
  103. config ARCH_FOOTBRIDGE
  104. bool "FootBridge"
  105. select FOOTBRIDGE
  106. help
  107. Support for systems based on the DC21285 companion chip
  108. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  109. config ARCH_INTEGRATOR
  110. bool "Integrator"
  111. select ARM_AMBA
  112. select ICST525
  113. help
  114. Support for ARM's Integrator platform.
  115. config ARCH_IOP3XX
  116. bool "IOP3xx-based"
  117. select PCI
  118. help
  119. Support for Intel's IOP3XX (XScale) family of processors.
  120. config ARCH_IXP4XX
  121. bool "IXP4xx-based"
  122. help
  123. Support for Intel's IXP4XX (XScale) family of processors.
  124. config ARCH_IXP2000
  125. bool "IXP2400/2800-based"
  126. select PCI
  127. help
  128. Support for Intel's IXP2400/2800 (XScale) family of processors.
  129. config ARCH_IXP23XX
  130. bool "IXP23XX-based"
  131. select PCI
  132. help
  133. Support for Intel's IXP23xx (XScale) family of processors.
  134. config ARCH_L7200
  135. bool "LinkUp-L7200"
  136. select FIQ
  137. help
  138. Say Y here if you intend to run this kernel on a LinkUp Systems
  139. L7200 Software Development Board which uses an ARM720T processor.
  140. Information on this board can be obtained at:
  141. <http://www.linkupsys.com/>
  142. If you have any questions or comments about the Linux kernel port
  143. to this board, send e-mail to <sjhill@cotw.com>.
  144. config ARCH_PXA
  145. bool "PXA2xx-based"
  146. select ARCH_MTD_XIP
  147. help
  148. Support for Intel's PXA2XX processor line.
  149. config ARCH_RPC
  150. bool "RiscPC"
  151. select ARCH_ACORN
  152. select FIQ
  153. select TIMER_ACORN
  154. select ARCH_MAY_HAVE_PC_FDC
  155. select ISA_DMA_API
  156. help
  157. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  158. CD-ROM interface, serial and parallel port, and the floppy drive.
  159. config ARCH_SA1100
  160. bool "SA1100-based"
  161. select ISA
  162. select ARCH_DISCONTIGMEM_ENABLE
  163. select ARCH_MTD_XIP
  164. help
  165. Support for StrongARM 11x0 based boards.
  166. config ARCH_S3C2410
  167. bool "Samsung S3C2410"
  168. help
  169. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  170. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  171. the Samsung SMDK2410 development board (and derivatives).
  172. config ARCH_SHARK
  173. bool "Shark"
  174. select ISA
  175. select ISA_DMA
  176. select PCI
  177. help
  178. Support for the StrongARM based Digital DNARD machine, also known
  179. as "Shark" (<http://www.shark-linux.de/shark.html>).
  180. config ARCH_LH7A40X
  181. bool "Sharp LH7A40X"
  182. help
  183. Say Y here for systems based on one of the Sharp LH7A40X
  184. System on a Chip processors. These CPUs include an ARM922T
  185. core with a wide array of integrated devices for
  186. hand-held and low-power applications.
  187. config ARCH_OMAP
  188. bool "TI OMAP"
  189. help
  190. Support for TI's OMAP platform (OMAP1 and OMAP2).
  191. config ARCH_VERSATILE
  192. bool "Versatile"
  193. select ARM_AMBA
  194. select ARM_VIC
  195. select ICST307
  196. help
  197. This enables support for ARM Ltd Versatile board.
  198. config ARCH_REALVIEW
  199. bool "RealView"
  200. select ARM_AMBA
  201. select ICST307
  202. help
  203. This enables support for ARM Ltd RealView boards.
  204. config ARCH_IMX
  205. bool "IMX"
  206. help
  207. Support for Motorola's i.MX family of processors (MX1, MXL).
  208. config ARCH_H720X
  209. bool "Hynix-HMS720x-based"
  210. select ISA_DMA_API
  211. help
  212. This enables support for systems based on the Hynix HMS720x
  213. config ARCH_AAEC2000
  214. bool "Agilent AAEC-2000 based"
  215. select ARM_AMBA
  216. help
  217. This enables support for systems based on the Agilent AAEC-2000
  218. config ARCH_AT91RM9200
  219. bool "AT91RM9200"
  220. help
  221. Say Y here if you intend to run this kernel on an Atmel
  222. AT91RM9200-based board.
  223. endchoice
  224. source "arch/arm/mach-clps711x/Kconfig"
  225. source "arch/arm/mach-ep93xx/Kconfig"
  226. source "arch/arm/mach-footbridge/Kconfig"
  227. source "arch/arm/mach-integrator/Kconfig"
  228. source "arch/arm/mach-iop3xx/Kconfig"
  229. source "arch/arm/mach-ixp4xx/Kconfig"
  230. source "arch/arm/mach-ixp2000/Kconfig"
  231. source "arch/arm/mach-ixp23xx/Kconfig"
  232. source "arch/arm/mach-pxa/Kconfig"
  233. source "arch/arm/mach-sa1100/Kconfig"
  234. source "arch/arm/plat-omap/Kconfig"
  235. source "arch/arm/mach-omap1/Kconfig"
  236. source "arch/arm/mach-omap2/Kconfig"
  237. source "arch/arm/mach-s3c2410/Kconfig"
  238. source "arch/arm/mach-lh7a40x/Kconfig"
  239. source "arch/arm/mach-imx/Kconfig"
  240. source "arch/arm/mach-h720x/Kconfig"
  241. source "arch/arm/mach-versatile/Kconfig"
  242. source "arch/arm/mach-aaec2000/Kconfig"
  243. source "arch/arm/mach-realview/Kconfig"
  244. source "arch/arm/mach-at91rm9200/Kconfig"
  245. # Definitions to make life easier
  246. config ARCH_ACORN
  247. bool
  248. source arch/arm/mm/Kconfig
  249. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  250. config XSCALE_PMU
  251. bool
  252. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  253. default y
  254. endmenu
  255. source "arch/arm/common/Kconfig"
  256. config FORCE_MAX_ZONEORDER
  257. int
  258. depends on SA1111
  259. default "9"
  260. menu "Bus support"
  261. config ARM_AMBA
  262. bool
  263. config ISA
  264. bool
  265. help
  266. Find out whether you have ISA slots on your motherboard. ISA is the
  267. name of a bus system, i.e. the way the CPU talks to the other stuff
  268. inside your box. Other bus systems are PCI, EISA, MicroChannel
  269. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  270. newer boards don't support it. If you have ISA, say Y, otherwise N.
  271. # Select ISA DMA controller support
  272. config ISA_DMA
  273. bool
  274. select ISA_DMA_API
  275. # Select ISA DMA interface
  276. config ISA_DMA_API
  277. bool
  278. config PCI
  279. bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB
  280. help
  281. Find out whether you have a PCI motherboard. PCI is the name of a
  282. bus system, i.e. the way the CPU talks to the other stuff inside
  283. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  284. VESA. If you have PCI, say Y, otherwise N.
  285. The PCI-HOWTO, available from
  286. <http://www.tldp.org/docs.html#howto>, contains valuable
  287. information about which PCI hardware does work under Linux and which
  288. doesn't.
  289. # Select the host bridge type
  290. config PCI_HOST_VIA82C505
  291. bool
  292. depends on PCI && ARCH_SHARK
  293. default y
  294. source "drivers/pci/Kconfig"
  295. source "drivers/pcmcia/Kconfig"
  296. endmenu
  297. menu "Kernel Features"
  298. config SMP
  299. bool "Symmetric Multi-Processing (EXPERIMENTAL)"
  300. depends on EXPERIMENTAL && REALVIEW_MPCORE
  301. help
  302. This enables support for systems with more than one CPU. If you have
  303. a system with only one CPU, like most personal computers, say N. If
  304. you have a system with more than one CPU, say Y.
  305. If you say N here, the kernel will run on single and multiprocessor
  306. machines, but will use only one CPU of a multiprocessor machine. If
  307. you say Y here, the kernel will run on many, but not all, single
  308. processor machines. On a single processor machine, the kernel will
  309. run faster if you say N here.
  310. See also the <file:Documentation/smp.txt>,
  311. <file:Documentation/i386/IO-APIC.txt>,
  312. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  313. <http://www.linuxdoc.org/docs.html#howto>.
  314. If you don't know what to do here, say N.
  315. config NR_CPUS
  316. int "Maximum number of CPUs (2-32)"
  317. range 2 32
  318. depends on SMP
  319. default "4"
  320. config HOTPLUG_CPU
  321. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  322. depends on SMP && HOTPLUG && EXPERIMENTAL
  323. help
  324. Say Y here to experiment with turning CPUs off and on. CPUs
  325. can be controlled through /sys/devices/system/cpu.
  326. config LOCAL_TIMERS
  327. bool "Use local timer interrupts"
  328. depends on SMP && REALVIEW_MPCORE
  329. default y
  330. help
  331. Enable support for local timers on SMP platforms, rather then the
  332. legacy IPI broadcast method. Local timers allows the system
  333. accounting to be spread across the timer interval, preventing a
  334. "thundering herd" at every timer tick.
  335. config PREEMPT
  336. bool "Preemptible Kernel (EXPERIMENTAL)"
  337. depends on EXPERIMENTAL
  338. help
  339. This option reduces the latency of the kernel when reacting to
  340. real-time or interactive events by allowing a low priority process to
  341. be preempted even if it is in kernel mode executing a system call.
  342. This allows applications to run more reliably even when the system is
  343. under load.
  344. Say Y here if you are building a kernel for a desktop, embedded
  345. or real-time system. Say N if you are unsure.
  346. config NO_IDLE_HZ
  347. bool "Dynamic tick timer"
  348. help
  349. Select this option if you want to disable continuous timer ticks
  350. and have them programmed to occur as required. This option saves
  351. power as the system can remain in idle state for longer.
  352. By default dynamic tick is disabled during the boot, and can be
  353. manually enabled with:
  354. echo 1 > /sys/devices/system/timer/timer0/dyn_tick
  355. Alternatively, if you want dynamic tick automatically enabled
  356. during boot, pass "dyntick=enable" via the kernel command string.
  357. Please note that dynamic tick may affect the accuracy of
  358. timekeeping on some platforms depending on the implementation.
  359. Currently at least OMAP, PXA2xx and SA11x0 platforms are known
  360. to have accurate timekeeping with dynamic tick.
  361. config HZ
  362. int
  363. default 128 if ARCH_L7200
  364. default 200 if ARCH_EBSA110 || ARCH_S3C2410
  365. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  366. default 100
  367. config AEABI
  368. bool "Use the ARM EABI to compile the kernel"
  369. help
  370. This option allows for the kernel to be compiled using the latest
  371. ARM ABI (aka EABI). This is only useful if you are using a user
  372. space environment that is also compiled with EABI.
  373. Since there are major incompatibilities between the legacy ABI and
  374. EABI, especially with regard to structure member alignment, this
  375. option also changes the kernel syscall calling convention to
  376. disambiguate both ABIs and allow for backward compatibility support
  377. (selected with CONFIG_OABI_COMPAT).
  378. To use this you need GCC version 4.0.0 or later.
  379. config OABI_COMPAT
  380. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  381. depends on AEABI && EXPERIMENTAL
  382. default y
  383. help
  384. This option preserves the old syscall interface along with the
  385. new (ARM EABI) one. It also provides a compatibility layer to
  386. intercept syscalls that have structure arguments which layout
  387. in memory differs between the legacy ABI and the new ARM EABI
  388. (only for non "thumb" binaries). This option adds a tiny
  389. overhead to all syscalls and produces a slightly larger kernel.
  390. If you know you'll be using only pure EABI user space then you
  391. can say N here. If this option is not selected and you attempt
  392. to execute a legacy ABI binary then the result will be
  393. UNPREDICTABLE (in fact it can be predicted that it won't work
  394. at all). If in doubt say Y.
  395. config ARCH_DISCONTIGMEM_ENABLE
  396. bool
  397. default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
  398. help
  399. Say Y to support efficient handling of discontiguous physical memory,
  400. for architectures which are either NUMA (Non-Uniform Memory Access)
  401. or have huge holes in the physical address space for other reasons.
  402. See <file:Documentation/vm/numa> for more.
  403. config NODES_SHIFT
  404. int
  405. default "4" if ARCH_LH7A40X
  406. default "2"
  407. depends on NEED_MULTIPLE_NODES
  408. source "mm/Kconfig"
  409. config LEDS
  410. bool "Timer and CPU usage LEDs"
  411. depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
  412. ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
  413. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  414. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  415. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  416. ARCH_AT91RM9200
  417. help
  418. If you say Y here, the LEDs on your machine will be used
  419. to provide useful information about your current system status.
  420. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  421. be able to select which LEDs are active using the options below. If
  422. you are compiling a kernel for the EBSA-110 or the LART however, the
  423. red LED will simply flash regularly to indicate that the system is
  424. still functional. It is safe to say Y here if you have a CATS
  425. system, but the driver will do nothing.
  426. config LEDS_TIMER
  427. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  428. MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
  429. depends on LEDS
  430. default y if ARCH_EBSA110
  431. help
  432. If you say Y here, one of the system LEDs (the green one on the
  433. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  434. will flash regularly to indicate that the system is still
  435. operational. This is mainly useful to kernel hackers who are
  436. debugging unstable kernels.
  437. The LART uses the same LED for both Timer LED and CPU usage LED
  438. functions. You may choose to use both, but the Timer LED function
  439. will overrule the CPU usage LED.
  440. config LEDS_CPU
  441. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  442. !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
  443. depends on LEDS
  444. help
  445. If you say Y here, the red LED will be used to give a good real
  446. time indication of CPU usage, by lighting whenever the idle task
  447. is not currently executing.
  448. The LART uses the same LED for both Timer LED and CPU usage LED
  449. functions. You may choose to use both, but the Timer LED function
  450. will overrule the CPU usage LED.
  451. config ALIGNMENT_TRAP
  452. bool
  453. default y if !ARCH_EBSA110
  454. help
  455. ARM processors can not fetch/store information which is not
  456. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  457. address divisible by 4. On 32-bit ARM processors, these non-aligned
  458. fetch/store instructions will be emulated in software if you say
  459. here, which has a severe performance impact. This is necessary for
  460. correct operation of some network protocols. With an IP-only
  461. configuration it is safe to say N, otherwise say Y.
  462. endmenu
  463. menu "Boot options"
  464. # Compressed boot loader in ROM. Yes, we really want to ask about
  465. # TEXT and BSS so we preserve their values in the config files.
  466. config ZBOOT_ROM_TEXT
  467. hex "Compressed ROM boot loader base address"
  468. default "0"
  469. help
  470. The physical address at which the ROM-able zImage is to be
  471. placed in the target. Platforms which normally make use of
  472. ROM-able zImage formats normally set this to a suitable
  473. value in their defconfig file.
  474. If ZBOOT_ROM is not enabled, this has no effect.
  475. config ZBOOT_ROM_BSS
  476. hex "Compressed ROM boot loader BSS address"
  477. default "0"
  478. help
  479. The base address of 64KiB of read/write memory in the target
  480. for the ROM-able zImage, which must be available while the
  481. decompressor is running. Platforms which normally make use of
  482. ROM-able zImage formats normally set this to a suitable
  483. value in their defconfig file.
  484. If ZBOOT_ROM is not enabled, this has no effect.
  485. config ZBOOT_ROM
  486. bool "Compressed boot loader in ROM/flash"
  487. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  488. help
  489. Say Y here if you intend to execute your compressed kernel image
  490. (zImage) directly from ROM or flash. If unsure, say N.
  491. config CMDLINE
  492. string "Default kernel command string"
  493. default ""
  494. help
  495. On some architectures (EBSA110 and CATS), there is currently no way
  496. for the boot loader to pass arguments to the kernel. For these
  497. architectures, you should supply some command-line options at build
  498. time by entering them here. As a minimum, you should specify the
  499. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  500. config XIP_KERNEL
  501. bool "Kernel Execute-In-Place from ROM"
  502. depends on !ZBOOT_ROM
  503. help
  504. Execute-In-Place allows the kernel to run from non-volatile storage
  505. directly addressable by the CPU, such as NOR flash. This saves RAM
  506. space since the text section of the kernel is not loaded from flash
  507. to RAM. Read-write sections, such as the data section and stack,
  508. are still copied to RAM. The XIP kernel is not compressed since
  509. it has to run directly from flash, so it will take more space to
  510. store it. The flash address used to link the kernel object files,
  511. and for storing it, is configuration dependent. Therefore, if you
  512. say Y here, you must know the proper physical address where to
  513. store the kernel image depending on your own flash memory usage.
  514. Also note that the make target becomes "make xipImage" rather than
  515. "make zImage" or "make Image". The final kernel binary to put in
  516. ROM memory will be arch/arm/boot/xipImage.
  517. If unsure, say N.
  518. config XIP_PHYS_ADDR
  519. hex "XIP Kernel Physical Location"
  520. depends on XIP_KERNEL
  521. default "0x00080000"
  522. help
  523. This is the physical address in your flash memory the kernel will
  524. be linked for and stored to. This address is dependent on your
  525. own flash usage.
  526. endmenu
  527. if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1)
  528. menu "CPU Frequency scaling"
  529. source "drivers/cpufreq/Kconfig"
  530. config CPU_FREQ_SA1100
  531. bool
  532. depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
  533. default y
  534. config CPU_FREQ_SA1110
  535. bool
  536. depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
  537. default y
  538. config CPU_FREQ_INTEGRATOR
  539. tristate "CPUfreq driver for ARM Integrator CPUs"
  540. depends on ARCH_INTEGRATOR && CPU_FREQ
  541. default y
  542. help
  543. This enables the CPUfreq driver for ARM Integrator CPUs.
  544. For details, take a look at <file:Documentation/cpu-freq>.
  545. If in doubt, say Y.
  546. endmenu
  547. endif
  548. menu "Floating point emulation"
  549. comment "At least one emulation must be selected"
  550. config FPE_NWFPE
  551. bool "NWFPE math emulation"
  552. depends on !AEABI || OABI_COMPAT
  553. ---help---
  554. Say Y to include the NWFPE floating point emulator in the kernel.
  555. This is necessary to run most binaries. Linux does not currently
  556. support floating point hardware so you need to say Y here even if
  557. your machine has an FPA or floating point co-processor podule.
  558. You may say N here if you are going to load the Acorn FPEmulator
  559. early in the bootup.
  560. config FPE_NWFPE_XP
  561. bool "Support extended precision"
  562. depends on FPE_NWFPE
  563. help
  564. Say Y to include 80-bit support in the kernel floating-point
  565. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  566. Note that gcc does not generate 80-bit operations by default,
  567. so in most cases this option only enlarges the size of the
  568. floating point emulator without any good reason.
  569. You almost surely want to say N here.
  570. config FPE_FASTFPE
  571. bool "FastFPE math emulation (EXPERIMENTAL)"
  572. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  573. ---help---
  574. Say Y here to include the FAST floating point emulator in the kernel.
  575. This is an experimental much faster emulator which now also has full
  576. precision for the mantissa. It does not support any exceptions.
  577. It is very simple, and approximately 3-6 times faster than NWFPE.
  578. It should be sufficient for most programs. It may be not suitable
  579. for scientific calculations, but you have to check this for yourself.
  580. If you do not feel you need a faster FP emulation you should better
  581. choose NWFPE.
  582. config VFP
  583. bool "VFP-format floating point maths"
  584. depends on CPU_V6 || CPU_ARM926T
  585. help
  586. Say Y to include VFP support code in the kernel. This is needed
  587. if your hardware includes a VFP unit.
  588. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  589. release notes and additional status information.
  590. Say N if your target does not have VFP hardware.
  591. endmenu
  592. menu "Userspace binary formats"
  593. source "fs/Kconfig.binfmt"
  594. config ARTHUR
  595. tristate "RISC OS personality"
  596. depends on !AEABI
  597. help
  598. Say Y here to include the kernel code necessary if you want to run
  599. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  600. experimental; if this sounds frightening, say N and sleep in peace.
  601. You can also say M here to compile this support as a module (which
  602. will be called arthur).
  603. endmenu
  604. menu "Power management options"
  605. source "kernel/power/Kconfig"
  606. config APM
  607. tristate "Advanced Power Management Emulation"
  608. ---help---
  609. APM is a BIOS specification for saving power using several different
  610. techniques. This is mostly useful for battery powered laptops with
  611. APM compliant BIOSes. If you say Y here, the system time will be
  612. reset after a RESUME operation, the /proc/apm device will provide
  613. battery status information, and user-space programs will receive
  614. notification of APM "events" (e.g. battery status change).
  615. In order to use APM, you will need supporting software. For location
  616. and more information, read <file:Documentation/pm.txt> and the
  617. Battery Powered Linux mini-HOWTO, available from
  618. <http://www.tldp.org/docs.html#howto>.
  619. This driver does not spin down disk drives (see the hdparm(8)
  620. manpage ("man 8 hdparm") for that), and it doesn't turn off
  621. VESA-compliant "green" monitors.
  622. Generally, if you don't have a battery in your machine, there isn't
  623. much point in using this driver and you should say N. If you get
  624. random kernel OOPSes or reboots that don't seem to be related to
  625. anything, try disabling/enabling this option (or disabling/enabling
  626. APM in your BIOS).
  627. endmenu
  628. source "net/Kconfig"
  629. menu "Device Drivers"
  630. source "drivers/base/Kconfig"
  631. source "drivers/connector/Kconfig"
  632. if ALIGNMENT_TRAP
  633. source "drivers/mtd/Kconfig"
  634. endif
  635. source "drivers/parport/Kconfig"
  636. source "drivers/pnp/Kconfig"
  637. source "drivers/block/Kconfig"
  638. source "drivers/acorn/block/Kconfig"
  639. if PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \
  640. || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
  641. || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
  642. || ARCH_IXP23XX
  643. source "drivers/ide/Kconfig"
  644. endif
  645. source "drivers/scsi/Kconfig"
  646. source "drivers/md/Kconfig"
  647. source "drivers/message/fusion/Kconfig"
  648. source "drivers/ieee1394/Kconfig"
  649. source "drivers/message/i2o/Kconfig"
  650. source "drivers/net/Kconfig"
  651. source "drivers/isdn/Kconfig"
  652. # input before char - char/joystick depends on it. As does USB.
  653. source "drivers/input/Kconfig"
  654. source "drivers/char/Kconfig"
  655. source "drivers/i2c/Kconfig"
  656. source "drivers/spi/Kconfig"
  657. source "drivers/w1/Kconfig"
  658. source "drivers/hwmon/Kconfig"
  659. #source "drivers/l3/Kconfig"
  660. source "drivers/misc/Kconfig"
  661. source "drivers/mfd/Kconfig"
  662. source "drivers/leds/Kconfig"
  663. source "drivers/media/Kconfig"
  664. source "drivers/video/Kconfig"
  665. source "sound/Kconfig"
  666. source "drivers/usb/Kconfig"
  667. source "drivers/mmc/Kconfig"
  668. source "drivers/rtc/Kconfig"
  669. endmenu
  670. source "fs/Kconfig"
  671. source "arch/arm/oprofile/Kconfig"
  672. source "arch/arm/Kconfig.debug"
  673. source "security/Kconfig"
  674. source "crypto/Kconfig"
  675. source "lib/Kconfig"