Kconfig 27 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 GENERIC_TIME
  18. bool
  19. default n
  20. config MMU
  21. bool
  22. default y
  23. config EISA
  24. bool
  25. ---help---
  26. The Extended Industry Standard Architecture (EISA) bus was
  27. developed as an open alternative to the IBM MicroChannel bus.
  28. The EISA bus provided some of the features of the IBM MicroChannel
  29. bus while maintaining backward compatibility with cards made for
  30. the older ISA bus. The EISA bus saw limited use between 1988 and
  31. 1995 when it was made obsolete by the PCI bus.
  32. Say Y here if you are building a kernel for an EISA-based machine.
  33. Otherwise, say N.
  34. config SBUS
  35. bool
  36. config MCA
  37. bool
  38. help
  39. MicroChannel Architecture is found in some IBM PS/2 machines and
  40. laptops. It is a bus system similar to PCI or ISA. See
  41. <file:Documentation/mca.txt> (and especially the web page given
  42. there) before attempting to build an MCA bus kernel.
  43. config GENERIC_HARDIRQS
  44. bool
  45. default y
  46. config TRACE_IRQFLAGS_SUPPORT
  47. bool
  48. default y
  49. config HARDIRQS_SW_RESEND
  50. bool
  51. default y
  52. config GENERIC_IRQ_PROBE
  53. bool
  54. default y
  55. config RWSEM_GENERIC_SPINLOCK
  56. bool
  57. default y
  58. config RWSEM_XCHGADD_ALGORITHM
  59. bool
  60. config ARCH_HAS_ILOG2_U32
  61. bool
  62. default n
  63. config ARCH_HAS_ILOG2_U64
  64. bool
  65. default n
  66. config GENERIC_HWEIGHT
  67. bool
  68. default y
  69. config GENERIC_CALIBRATE_DELAY
  70. bool
  71. default y
  72. config GENERIC_BUST_SPINLOCK
  73. bool
  74. config ARCH_MAY_HAVE_PC_FDC
  75. bool
  76. config GENERIC_ISA_DMA
  77. bool
  78. config FIQ
  79. bool
  80. config ARCH_MTD_XIP
  81. bool
  82. config VECTORS_BASE
  83. hex
  84. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  85. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  86. default 0x00000000
  87. help
  88. The base address of exception vectors.
  89. source "init/Kconfig"
  90. menu "System Type"
  91. choice
  92. prompt "ARM system type"
  93. default ARCH_VERSATILE
  94. config ARCH_AAEC2000
  95. bool "Agilent AAEC-2000 based"
  96. select ARM_AMBA
  97. help
  98. This enables support for systems based on the Agilent AAEC-2000
  99. config ARCH_INTEGRATOR
  100. bool "ARM Ltd. Integrator family"
  101. select ARM_AMBA
  102. select ICST525
  103. help
  104. Support for ARM's Integrator platform.
  105. config ARCH_REALVIEW
  106. bool "ARM Ltd. RealView family"
  107. select ARM_AMBA
  108. select ICST307
  109. help
  110. This enables support for ARM Ltd RealView boards.
  111. config ARCH_VERSATILE
  112. bool "ARM Ltd. Versatile family"
  113. select ARM_AMBA
  114. select ARM_VIC
  115. select ICST307
  116. help
  117. This enables support for ARM Ltd Versatile board.
  118. config ARCH_AT91
  119. bool "Atmel AT91"
  120. help
  121. This enables support for systems based on the Atmel AT91RM9200
  122. and AT91SAM9xxx processors.
  123. config ARCH_CLPS7500
  124. bool "Cirrus CL-PS7500FE"
  125. select TIMER_ACORN
  126. select ISA
  127. help
  128. Support for the Cirrus Logic PS7500FE system-on-a-chip.
  129. config ARCH_CLPS711X
  130. bool "Cirrus Logic CLPS711x/EP721x-based"
  131. help
  132. Support for Cirrus Logic 711x/721x based boards.
  133. config ARCH_CO285
  134. bool "Co-EBSA285"
  135. select FOOTBRIDGE
  136. select FOOTBRIDGE_ADDIN
  137. help
  138. Support for Intel's EBSA285 companion chip.
  139. config ARCH_EBSA110
  140. bool "EBSA-110"
  141. select ISA
  142. help
  143. This is an evaluation board for the StrongARM processor available
  144. from Digital. It has limited hardware on-board, including an
  145. Ethernet interface, two PCMCIA sockets, two serial ports and a
  146. parallel port.
  147. config ARCH_EP93XX
  148. bool "EP93xx-based"
  149. select ARM_AMBA
  150. select ARM_VIC
  151. help
  152. This enables support for the Cirrus EP93xx series of CPUs.
  153. config ARCH_FOOTBRIDGE
  154. bool "FootBridge"
  155. select FOOTBRIDGE
  156. help
  157. Support for systems based on the DC21285 companion chip
  158. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  159. config ARCH_NETX
  160. bool "Hilscher NetX based"
  161. select ARM_VIC
  162. help
  163. This enables support for systems based on the Hilscher NetX Soc
  164. config ARCH_H720X
  165. bool "Hynix HMS720x-based"
  166. select ISA_DMA_API
  167. help
  168. This enables support for systems based on the Hynix HMS720x
  169. config ARCH_IMX
  170. bool "IMX"
  171. help
  172. Support for Motorola's i.MX family of processors (MX1, MXL).
  173. config ARCH_IOP32X
  174. bool "IOP32x-based"
  175. depends on MMU
  176. select PLAT_IOP
  177. select PCI
  178. help
  179. Support for Intel's 80219 and IOP32X (XScale) family of
  180. processors.
  181. config ARCH_IOP33X
  182. bool "IOP33x-based"
  183. depends on MMU
  184. select PLAT_IOP
  185. select PCI
  186. help
  187. Support for Intel's IOP33X (XScale) family of processors.
  188. config ARCH_IOP13XX
  189. bool "IOP13xx-based"
  190. select PCI
  191. help
  192. Support for Intel's IOP13XX (XScale) family of processors.
  193. config ARCH_IXP4XX
  194. bool "IXP4xx-based"
  195. depends on MMU
  196. select GENERIC_TIME
  197. help
  198. Support for Intel's IXP4XX (XScale) family of processors.
  199. config ARCH_IXP2000
  200. bool "IXP2400/2800-based"
  201. depends on MMU
  202. select PCI
  203. help
  204. Support for Intel's IXP2400/2800 (XScale) family of processors.
  205. config ARCH_IXP23XX
  206. bool "IXP23XX-based"
  207. depends on MMU
  208. select PCI
  209. help
  210. Support for Intel's IXP23xx (XScale) family of processors.
  211. config ARCH_L7200
  212. bool "LinkUp-L7200"
  213. select FIQ
  214. help
  215. Say Y here if you intend to run this kernel on a LinkUp Systems
  216. L7200 Software Development Board which uses an ARM720T processor.
  217. Information on this board can be obtained at:
  218. <http://www.linkupsys.com/>
  219. If you have any questions or comments about the Linux kernel port
  220. to this board, send e-mail to <sjhill@cotw.com>.
  221. config ARCH_NS9XXX
  222. bool "NetSilicon NS9xxx"
  223. help
  224. Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
  225. System.
  226. <http://www.digi.com/products/microprocessors/index.jsp>
  227. config ARCH_PNX4008
  228. bool "Philips Nexperia PNX4008 Mobile"
  229. help
  230. This enables support for Philips PNX4008 mobile platform.
  231. config ARCH_PXA
  232. bool "PXA2xx-based"
  233. depends on MMU
  234. select ARCH_MTD_XIP
  235. select GENERIC_TIME
  236. help
  237. Support for Intel's PXA2XX processor line.
  238. config ARCH_RPC
  239. bool "RiscPC"
  240. select ARCH_ACORN
  241. select FIQ
  242. select TIMER_ACORN
  243. select ARCH_MAY_HAVE_PC_FDC
  244. select ISA_DMA_API
  245. help
  246. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  247. CD-ROM interface, serial and parallel port, and the floppy drive.
  248. config ARCH_SA1100
  249. bool "SA1100-based"
  250. select ISA
  251. select ARCH_DISCONTIGMEM_ENABLE
  252. select ARCH_MTD_XIP
  253. help
  254. Support for StrongARM 11x0 based boards.
  255. config ARCH_S3C2410
  256. bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
  257. help
  258. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  259. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  260. the Samsung SMDK2410 development board (and derivatives).
  261. config ARCH_SHARK
  262. bool "Shark"
  263. select ISA
  264. select ISA_DMA
  265. select PCI
  266. help
  267. Support for the StrongARM based Digital DNARD machine, also known
  268. as "Shark" (<http://www.shark-linux.de/shark.html>).
  269. config ARCH_LH7A40X
  270. bool "Sharp LH7A40X"
  271. help
  272. Say Y here for systems based on one of the Sharp LH7A40X
  273. System on a Chip processors. These CPUs include an ARM922T
  274. core with a wide array of integrated devices for
  275. hand-held and low-power applications.
  276. config ARCH_OMAP
  277. bool "TI OMAP"
  278. help
  279. Support for TI's OMAP platform (OMAP1 and OMAP2).
  280. endchoice
  281. source "arch/arm/mach-clps711x/Kconfig"
  282. source "arch/arm/mach-ep93xx/Kconfig"
  283. source "arch/arm/mach-footbridge/Kconfig"
  284. source "arch/arm/mach-integrator/Kconfig"
  285. source "arch/arm/mach-iop32x/Kconfig"
  286. source "arch/arm/mach-iop33x/Kconfig"
  287. source "arch/arm/mach-iop13xx/Kconfig"
  288. source "arch/arm/mach-ixp4xx/Kconfig"
  289. source "arch/arm/mach-ixp2000/Kconfig"
  290. source "arch/arm/mach-ixp23xx/Kconfig"
  291. source "arch/arm/mach-pxa/Kconfig"
  292. source "arch/arm/mach-sa1100/Kconfig"
  293. source "arch/arm/plat-omap/Kconfig"
  294. source "arch/arm/mach-omap1/Kconfig"
  295. source "arch/arm/mach-omap2/Kconfig"
  296. source "arch/arm/plat-s3c24xx/Kconfig"
  297. if ARCH_S3C2410
  298. source "arch/arm/mach-s3c2400/Kconfig"
  299. source "arch/arm/mach-s3c2410/Kconfig"
  300. source "arch/arm/mach-s3c2412/Kconfig"
  301. source "arch/arm/mach-s3c2440/Kconfig"
  302. source "arch/arm/mach-s3c2442/Kconfig"
  303. source "arch/arm/mach-s3c2443/Kconfig"
  304. endif
  305. source "arch/arm/mach-lh7a40x/Kconfig"
  306. source "arch/arm/mach-imx/Kconfig"
  307. source "arch/arm/mach-h720x/Kconfig"
  308. source "arch/arm/mach-versatile/Kconfig"
  309. source "arch/arm/mach-aaec2000/Kconfig"
  310. source "arch/arm/mach-realview/Kconfig"
  311. source "arch/arm/mach-at91/Kconfig"
  312. source "arch/arm/mach-netx/Kconfig"
  313. source "arch/arm/mach-ns9xxx/Kconfig"
  314. # Definitions to make life easier
  315. config ARCH_ACORN
  316. bool
  317. config PLAT_IOP
  318. bool
  319. source arch/arm/mm/Kconfig
  320. config IWMMXT
  321. bool "Enable iWMMXt support"
  322. depends CPU_XSCALE || CPU_XSC3
  323. default y if PXA27x
  324. help
  325. Enable support for iWMMXt context switching at run time if
  326. running on a CPU that supports it.
  327. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  328. config XSCALE_PMU
  329. bool
  330. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  331. default y
  332. if !MMU
  333. source "arch/arm/Kconfig-nommu"
  334. endif
  335. endmenu
  336. source "arch/arm/common/Kconfig"
  337. config FORCE_MAX_ZONEORDER
  338. int
  339. depends on SA1111
  340. default "9"
  341. menu "Bus support"
  342. config ARM_AMBA
  343. bool
  344. config ISA
  345. bool
  346. help
  347. Find out whether you have ISA slots on your motherboard. ISA is the
  348. name of a bus system, i.e. the way the CPU talks to the other stuff
  349. inside your box. Other bus systems are PCI, EISA, MicroChannel
  350. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  351. newer boards don't support it. If you have ISA, say Y, otherwise N.
  352. # Select ISA DMA controller support
  353. config ISA_DMA
  354. bool
  355. select ISA_DMA_API
  356. # Select ISA DMA interface
  357. config ISA_DMA_API
  358. bool
  359. config PCI
  360. bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX
  361. help
  362. Find out whether you have a PCI motherboard. PCI is the name of a
  363. bus system, i.e. the way the CPU talks to the other stuff inside
  364. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  365. VESA. If you have PCI, say Y, otherwise N.
  366. The PCI-HOWTO, available from
  367. <http://www.tldp.org/docs.html#howto>, contains valuable
  368. information about which PCI hardware does work under Linux and which
  369. doesn't.
  370. # Select the host bridge type
  371. config PCI_HOST_VIA82C505
  372. bool
  373. depends on PCI && ARCH_SHARK
  374. default y
  375. source "drivers/pci/Kconfig"
  376. source "drivers/pcmcia/Kconfig"
  377. endmenu
  378. menu "Kernel Features"
  379. config SMP
  380. bool "Symmetric Multi-Processing (EXPERIMENTAL)"
  381. depends on EXPERIMENTAL && REALVIEW_MPCORE
  382. help
  383. This enables support for systems with more than one CPU. If you have
  384. a system with only one CPU, like most personal computers, say N. If
  385. you have a system with more than one CPU, say Y.
  386. If you say N here, the kernel will run on single and multiprocessor
  387. machines, but will use only one CPU of a multiprocessor machine. If
  388. you say Y here, the kernel will run on many, but not all, single
  389. processor machines. On a single processor machine, the kernel will
  390. run faster if you say N here.
  391. See also the <file:Documentation/smp.txt>,
  392. <file:Documentation/i386/IO-APIC.txt>,
  393. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  394. <http://www.linuxdoc.org/docs.html#howto>.
  395. If you don't know what to do here, say N.
  396. config NR_CPUS
  397. int "Maximum number of CPUs (2-32)"
  398. range 2 32
  399. depends on SMP
  400. default "4"
  401. config HOTPLUG_CPU
  402. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  403. depends on SMP && HOTPLUG && EXPERIMENTAL
  404. help
  405. Say Y here to experiment with turning CPUs off and on. CPUs
  406. can be controlled through /sys/devices/system/cpu.
  407. config LOCAL_TIMERS
  408. bool "Use local timer interrupts"
  409. depends on SMP && REALVIEW_MPCORE
  410. default y
  411. help
  412. Enable support for local timers on SMP platforms, rather then the
  413. legacy IPI broadcast method. Local timers allows the system
  414. accounting to be spread across the timer interval, preventing a
  415. "thundering herd" at every timer tick.
  416. config PREEMPT
  417. bool "Preemptible Kernel (EXPERIMENTAL)"
  418. depends on EXPERIMENTAL
  419. help
  420. This option reduces the latency of the kernel when reacting to
  421. real-time or interactive events by allowing a low priority process to
  422. be preempted even if it is in kernel mode executing a system call.
  423. This allows applications to run more reliably even when the system is
  424. under load.
  425. Say Y here if you are building a kernel for a desktop, embedded
  426. or real-time system. Say N if you are unsure.
  427. config NO_IDLE_HZ
  428. bool "Dynamic tick timer"
  429. help
  430. Select this option if you want to disable continuous timer ticks
  431. and have them programmed to occur as required. This option saves
  432. power as the system can remain in idle state for longer.
  433. By default dynamic tick is disabled during the boot, and can be
  434. manually enabled with:
  435. echo 1 > /sys/devices/system/timer/timer0/dyn_tick
  436. Alternatively, if you want dynamic tick automatically enabled
  437. during boot, pass "dyntick=enable" via the kernel command string.
  438. Please note that dynamic tick may affect the accuracy of
  439. timekeeping on some platforms depending on the implementation.
  440. Currently at least OMAP, PXA2xx and SA11x0 platforms are known
  441. to have accurate timekeeping with dynamic tick.
  442. config HZ
  443. int
  444. default 128 if ARCH_L7200
  445. default 200 if ARCH_EBSA110 || ARCH_S3C2410
  446. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  447. default 100
  448. config AEABI
  449. bool "Use the ARM EABI to compile the kernel"
  450. help
  451. This option allows for the kernel to be compiled using the latest
  452. ARM ABI (aka EABI). This is only useful if you are using a user
  453. space environment that is also compiled with EABI.
  454. Since there are major incompatibilities between the legacy ABI and
  455. EABI, especially with regard to structure member alignment, this
  456. option also changes the kernel syscall calling convention to
  457. disambiguate both ABIs and allow for backward compatibility support
  458. (selected with CONFIG_OABI_COMPAT).
  459. To use this you need GCC version 4.0.0 or later.
  460. config OABI_COMPAT
  461. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  462. depends on AEABI && EXPERIMENTAL
  463. default y
  464. help
  465. This option preserves the old syscall interface along with the
  466. new (ARM EABI) one. It also provides a compatibility layer to
  467. intercept syscalls that have structure arguments which layout
  468. in memory differs between the legacy ABI and the new ARM EABI
  469. (only for non "thumb" binaries). This option adds a tiny
  470. overhead to all syscalls and produces a slightly larger kernel.
  471. If you know you'll be using only pure EABI user space then you
  472. can say N here. If this option is not selected and you attempt
  473. to execute a legacy ABI binary then the result will be
  474. UNPREDICTABLE (in fact it can be predicted that it won't work
  475. at all). If in doubt say Y.
  476. config ARCH_DISCONTIGMEM_ENABLE
  477. bool
  478. default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
  479. help
  480. Say Y to support efficient handling of discontiguous physical memory,
  481. for architectures which are either NUMA (Non-Uniform Memory Access)
  482. or have huge holes in the physical address space for other reasons.
  483. See <file:Documentation/vm/numa> for more.
  484. config NODES_SHIFT
  485. int
  486. default "4" if ARCH_LH7A40X
  487. default "2"
  488. depends on NEED_MULTIPLE_NODES
  489. source "mm/Kconfig"
  490. config LEDS
  491. bool "Timer and CPU usage LEDs"
  492. depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
  493. ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
  494. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  495. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  496. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  497. ARCH_AT91 || MACH_TRIZEPS4
  498. help
  499. If you say Y here, the LEDs on your machine will be used
  500. to provide useful information about your current system status.
  501. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  502. be able to select which LEDs are active using the options below. If
  503. you are compiling a kernel for the EBSA-110 or the LART however, the
  504. red LED will simply flash regularly to indicate that the system is
  505. still functional. It is safe to say Y here if you have a CATS
  506. system, but the driver will do nothing.
  507. config LEDS_TIMER
  508. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  509. MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
  510. depends on LEDS
  511. default y if ARCH_EBSA110
  512. help
  513. If you say Y here, one of the system LEDs (the green one on the
  514. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  515. will flash regularly to indicate that the system is still
  516. operational. This is mainly useful to kernel hackers who are
  517. debugging unstable kernels.
  518. The LART uses the same LED for both Timer LED and CPU usage LED
  519. functions. You may choose to use both, but the Timer LED function
  520. will overrule the CPU usage LED.
  521. config LEDS_CPU
  522. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  523. !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2
  524. depends on LEDS
  525. help
  526. If you say Y here, the red LED will be used to give a good real
  527. time indication of CPU usage, by lighting whenever the idle task
  528. is not currently executing.
  529. The LART uses the same LED for both Timer LED and CPU usage LED
  530. functions. You may choose to use both, but the Timer LED function
  531. will overrule the CPU usage LED.
  532. config ALIGNMENT_TRAP
  533. bool
  534. depends on CPU_CP15_MMU
  535. default y if !ARCH_EBSA110
  536. help
  537. ARM processors cannot fetch/store information which is not
  538. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  539. address divisible by 4. On 32-bit ARM processors, these non-aligned
  540. fetch/store instructions will be emulated in software if you say
  541. here, which has a severe performance impact. This is necessary for
  542. correct operation of some network protocols. With an IP-only
  543. configuration it is safe to say N, otherwise say Y.
  544. endmenu
  545. menu "Boot options"
  546. # Compressed boot loader in ROM. Yes, we really want to ask about
  547. # TEXT and BSS so we preserve their values in the config files.
  548. config ZBOOT_ROM_TEXT
  549. hex "Compressed ROM boot loader base address"
  550. default "0"
  551. help
  552. The physical address at which the ROM-able zImage is to be
  553. placed in the target. Platforms which normally make use of
  554. ROM-able zImage formats normally set this to a suitable
  555. value in their defconfig file.
  556. If ZBOOT_ROM is not enabled, this has no effect.
  557. config ZBOOT_ROM_BSS
  558. hex "Compressed ROM boot loader BSS address"
  559. default "0"
  560. help
  561. The base address of an area of read/write memory in the target
  562. for the ROM-able zImage which must be available while the
  563. decompressor is running. It must be large enough to hold the
  564. entire decompressed kernel plus an additional 128 KiB.
  565. Platforms which normally make use of ROM-able zImage formats
  566. normally set this to a suitable value in their defconfig file.
  567. If ZBOOT_ROM is not enabled, this has no effect.
  568. config ZBOOT_ROM
  569. bool "Compressed boot loader in ROM/flash"
  570. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  571. help
  572. Say Y here if you intend to execute your compressed kernel image
  573. (zImage) directly from ROM or flash. If unsure, say N.
  574. config CMDLINE
  575. string "Default kernel command string"
  576. default ""
  577. help
  578. On some architectures (EBSA110 and CATS), there is currently no way
  579. for the boot loader to pass arguments to the kernel. For these
  580. architectures, you should supply some command-line options at build
  581. time by entering them here. As a minimum, you should specify the
  582. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  583. config XIP_KERNEL
  584. bool "Kernel Execute-In-Place from ROM"
  585. depends on !ZBOOT_ROM
  586. help
  587. Execute-In-Place allows the kernel to run from non-volatile storage
  588. directly addressable by the CPU, such as NOR flash. This saves RAM
  589. space since the text section of the kernel is not loaded from flash
  590. to RAM. Read-write sections, such as the data section and stack,
  591. are still copied to RAM. The XIP kernel is not compressed since
  592. it has to run directly from flash, so it will take more space to
  593. store it. The flash address used to link the kernel object files,
  594. and for storing it, is configuration dependent. Therefore, if you
  595. say Y here, you must know the proper physical address where to
  596. store the kernel image depending on your own flash memory usage.
  597. Also note that the make target becomes "make xipImage" rather than
  598. "make zImage" or "make Image". The final kernel binary to put in
  599. ROM memory will be arch/arm/boot/xipImage.
  600. If unsure, say N.
  601. config XIP_PHYS_ADDR
  602. hex "XIP Kernel Physical Location"
  603. depends on XIP_KERNEL
  604. default "0x00080000"
  605. help
  606. This is the physical address in your flash memory the kernel will
  607. be linked for and stored to. This address is dependent on your
  608. own flash usage.
  609. config KEXEC
  610. bool "Kexec system call (EXPERIMENTAL)"
  611. depends on EXPERIMENTAL
  612. help
  613. kexec is a system call that implements the ability to shutdown your
  614. current kernel, and to start another kernel. It is like a reboot
  615. but it is indepedent of the system firmware. And like a reboot
  616. you can start any kernel with it, not just Linux.
  617. It is an ongoing process to be certain the hardware in a machine
  618. is properly shutdown, so do not be surprised if this code does not
  619. initially work for you. It may help to enable device hotplugging
  620. support.
  621. endmenu
  622. if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX )
  623. menu "CPU Frequency scaling"
  624. source "drivers/cpufreq/Kconfig"
  625. config CPU_FREQ_SA1100
  626. bool
  627. depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
  628. default y
  629. config CPU_FREQ_SA1110
  630. bool
  631. depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
  632. default y
  633. config CPU_FREQ_INTEGRATOR
  634. tristate "CPUfreq driver for ARM Integrator CPUs"
  635. depends on ARCH_INTEGRATOR && CPU_FREQ
  636. default y
  637. help
  638. This enables the CPUfreq driver for ARM Integrator CPUs.
  639. For details, take a look at <file:Documentation/cpu-freq>.
  640. If in doubt, say Y.
  641. config CPU_FREQ_IMX
  642. tristate "CPUfreq driver for i.MX CPUs"
  643. depends on ARCH_IMX && CPU_FREQ
  644. default n
  645. help
  646. This enables the CPUfreq driver for i.MX CPUs.
  647. If in doubt, say N.
  648. endmenu
  649. endif
  650. menu "Floating point emulation"
  651. comment "At least one emulation must be selected"
  652. config FPE_NWFPE
  653. bool "NWFPE math emulation"
  654. depends on !AEABI || OABI_COMPAT
  655. ---help---
  656. Say Y to include the NWFPE floating point emulator in the kernel.
  657. This is necessary to run most binaries. Linux does not currently
  658. support floating point hardware so you need to say Y here even if
  659. your machine has an FPA or floating point co-processor podule.
  660. You may say N here if you are going to load the Acorn FPEmulator
  661. early in the bootup.
  662. config FPE_NWFPE_XP
  663. bool "Support extended precision"
  664. depends on FPE_NWFPE
  665. help
  666. Say Y to include 80-bit support in the kernel floating-point
  667. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  668. Note that gcc does not generate 80-bit operations by default,
  669. so in most cases this option only enlarges the size of the
  670. floating point emulator without any good reason.
  671. You almost surely want to say N here.
  672. config FPE_FASTFPE
  673. bool "FastFPE math emulation (EXPERIMENTAL)"
  674. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  675. ---help---
  676. Say Y here to include the FAST floating point emulator in the kernel.
  677. This is an experimental much faster emulator which now also has full
  678. precision for the mantissa. It does not support any exceptions.
  679. It is very simple, and approximately 3-6 times faster than NWFPE.
  680. It should be sufficient for most programs. It may be not suitable
  681. for scientific calculations, but you have to check this for yourself.
  682. If you do not feel you need a faster FP emulation you should better
  683. choose NWFPE.
  684. config VFP
  685. bool "VFP-format floating point maths"
  686. depends on CPU_V6 || CPU_ARM926T
  687. help
  688. Say Y to include VFP support code in the kernel. This is needed
  689. if your hardware includes a VFP unit.
  690. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  691. release notes and additional status information.
  692. Say N if your target does not have VFP hardware.
  693. endmenu
  694. menu "Userspace binary formats"
  695. source "fs/Kconfig.binfmt"
  696. config ARTHUR
  697. tristate "RISC OS personality"
  698. depends on !AEABI
  699. help
  700. Say Y here to include the kernel code necessary if you want to run
  701. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  702. experimental; if this sounds frightening, say N and sleep in peace.
  703. You can also say M here to compile this support as a module (which
  704. will be called arthur).
  705. endmenu
  706. menu "Power management options"
  707. source "kernel/power/Kconfig"
  708. config APM
  709. tristate "Advanced Power Management Emulation"
  710. ---help---
  711. APM is a BIOS specification for saving power using several different
  712. techniques. This is mostly useful for battery powered laptops with
  713. APM compliant BIOSes. If you say Y here, the system time will be
  714. reset after a RESUME operation, the /proc/apm device will provide
  715. battery status information, and user-space programs will receive
  716. notification of APM "events" (e.g. battery status change).
  717. In order to use APM, you will need supporting software. For location
  718. and more information, read <file:Documentation/pm.txt> and the
  719. Battery Powered Linux mini-HOWTO, available from
  720. <http://www.tldp.org/docs.html#howto>.
  721. This driver does not spin down disk drives (see the hdparm(8)
  722. manpage ("man 8 hdparm") for that), and it doesn't turn off
  723. VESA-compliant "green" monitors.
  724. Generally, if you don't have a battery in your machine, there isn't
  725. much point in using this driver and you should say N. If you get
  726. random kernel OOPSes or reboots that don't seem to be related to
  727. anything, try disabling/enabling this option (or disabling/enabling
  728. APM in your BIOS).
  729. endmenu
  730. source "net/Kconfig"
  731. menu "Device Drivers"
  732. source "drivers/base/Kconfig"
  733. source "drivers/connector/Kconfig"
  734. if ALIGNMENT_TRAP || !CPU_CP15_MMU
  735. source "drivers/mtd/Kconfig"
  736. endif
  737. source "drivers/parport/Kconfig"
  738. source "drivers/pnp/Kconfig"
  739. source "drivers/block/Kconfig"
  740. source "drivers/acorn/block/Kconfig"
  741. if PCMCIA || ARCH_CLPS7500 || ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX \
  742. || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \
  743. || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \
  744. || ARCH_IXP23XX
  745. source "drivers/ide/Kconfig"
  746. endif
  747. source "drivers/scsi/Kconfig"
  748. source "drivers/ata/Kconfig"
  749. source "drivers/md/Kconfig"
  750. source "drivers/message/fusion/Kconfig"
  751. source "drivers/ieee1394/Kconfig"
  752. source "drivers/message/i2o/Kconfig"
  753. source "drivers/net/Kconfig"
  754. source "drivers/isdn/Kconfig"
  755. # input before char - char/joystick depends on it. As does USB.
  756. source "drivers/input/Kconfig"
  757. source "drivers/char/Kconfig"
  758. source "drivers/i2c/Kconfig"
  759. source "drivers/spi/Kconfig"
  760. source "drivers/w1/Kconfig"
  761. source "drivers/hwmon/Kconfig"
  762. #source "drivers/l3/Kconfig"
  763. source "drivers/misc/Kconfig"
  764. source "drivers/mfd/Kconfig"
  765. source "drivers/leds/Kconfig"
  766. source "drivers/media/Kconfig"
  767. source "drivers/video/Kconfig"
  768. source "sound/Kconfig"
  769. source "drivers/hid/Kconfig"
  770. source "drivers/usb/Kconfig"
  771. source "drivers/mmc/Kconfig"
  772. source "drivers/rtc/Kconfig"
  773. endmenu
  774. source "fs/Kconfig"
  775. source "arch/arm/oprofile/Kconfig"
  776. source "arch/arm/Kconfig.debug"
  777. source "security/Kconfig"
  778. source "crypto/Kconfig"
  779. source "lib/Kconfig"