Kconfig 30 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192
  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. select SYS_SUPPORTS_APM_EMULATION
  11. select HAVE_OPROFILE
  12. select HAVE_KPROBES if (!XIP_KERNEL)
  13. select HAVE_KRETPROBES if (HAVE_KPROBES)
  14. help
  15. The ARM series is a line of low-power-consumption RISC chip designs
  16. licensed by ARM Ltd and targeted at embedded applications and
  17. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  18. manufactured, but legacy ARM-based PC hardware remains popular in
  19. Europe. There is an ARM Linux project with a web page at
  20. <http://www.arm.linux.org.uk/>.
  21. config SYS_SUPPORTS_APM_EMULATION
  22. bool
  23. config GENERIC_GPIO
  24. bool
  25. default n
  26. config GENERIC_TIME
  27. bool
  28. default n
  29. config GENERIC_CLOCKEVENTS
  30. bool
  31. default n
  32. config GENERIC_CLOCKEVENTS_BROADCAST
  33. bool
  34. depends on GENERIC_CLOCKEVENTS
  35. default y if SMP && !LOCAL_TIMERS
  36. config MMU
  37. bool
  38. default y
  39. config NO_IOPORT
  40. bool
  41. default n
  42. config EISA
  43. bool
  44. ---help---
  45. The Extended Industry Standard Architecture (EISA) bus was
  46. developed as an open alternative to the IBM MicroChannel bus.
  47. The EISA bus provided some of the features of the IBM MicroChannel
  48. bus while maintaining backward compatibility with cards made for
  49. the older ISA bus. The EISA bus saw limited use between 1988 and
  50. 1995 when it was made obsolete by the PCI bus.
  51. Say Y here if you are building a kernel for an EISA-based machine.
  52. Otherwise, say N.
  53. config SBUS
  54. bool
  55. config MCA
  56. bool
  57. help
  58. MicroChannel Architecture is found in some IBM PS/2 machines and
  59. laptops. It is a bus system similar to PCI or ISA. See
  60. <file:Documentation/mca.txt> (and especially the web page given
  61. there) before attempting to build an MCA bus kernel.
  62. config GENERIC_HARDIRQS
  63. bool
  64. default y
  65. config STACKTRACE_SUPPORT
  66. bool
  67. default y
  68. config LOCKDEP_SUPPORT
  69. bool
  70. default y
  71. config TRACE_IRQFLAGS_SUPPORT
  72. bool
  73. default y
  74. config HARDIRQS_SW_RESEND
  75. bool
  76. default y
  77. config GENERIC_IRQ_PROBE
  78. bool
  79. default y
  80. config GENERIC_LOCKBREAK
  81. bool
  82. default y
  83. depends on SMP && PREEMPT
  84. config RWSEM_GENERIC_SPINLOCK
  85. bool
  86. default y
  87. config RWSEM_XCHGADD_ALGORITHM
  88. bool
  89. config ARCH_HAS_ILOG2_U32
  90. bool
  91. default n
  92. config ARCH_HAS_ILOG2_U64
  93. bool
  94. default n
  95. config GENERIC_HWEIGHT
  96. bool
  97. default y
  98. config GENERIC_CALIBRATE_DELAY
  99. bool
  100. default y
  101. config ARCH_SUPPORTS_AOUT
  102. def_bool y
  103. config ARCH_MAY_HAVE_PC_FDC
  104. bool
  105. config ZONE_DMA
  106. bool
  107. default y
  108. config GENERIC_ISA_DMA
  109. bool
  110. config FIQ
  111. bool
  112. config ARCH_MTD_XIP
  113. bool
  114. if OPROFILE
  115. config OPROFILE_ARMV6
  116. def_bool y
  117. depends on CPU_V6 && !SMP
  118. select OPROFILE_ARM11_CORE
  119. config OPROFILE_MPCORE
  120. def_bool y
  121. depends on CPU_V6 && SMP
  122. select OPROFILE_ARM11_CORE
  123. config OPROFILE_ARM11_CORE
  124. bool
  125. endif
  126. config VECTORS_BASE
  127. hex
  128. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  129. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  130. default 0x00000000
  131. help
  132. The base address of exception vectors.
  133. source "init/Kconfig"
  134. menu "System Type"
  135. choice
  136. prompt "ARM system type"
  137. default ARCH_VERSATILE
  138. config ARCH_AAEC2000
  139. bool "Agilent AAEC-2000 based"
  140. select ARM_AMBA
  141. help
  142. This enables support for systems based on the Agilent AAEC-2000
  143. config ARCH_INTEGRATOR
  144. bool "ARM Ltd. Integrator family"
  145. select ARM_AMBA
  146. select ICST525
  147. help
  148. Support for ARM's Integrator platform.
  149. config ARCH_REALVIEW
  150. bool "ARM Ltd. RealView family"
  151. select ARM_AMBA
  152. select ICST307
  153. select GENERIC_TIME
  154. select GENERIC_CLOCKEVENTS
  155. help
  156. This enables support for ARM Ltd RealView boards.
  157. config ARCH_VERSATILE
  158. bool "ARM Ltd. Versatile family"
  159. select ARM_AMBA
  160. select ARM_VIC
  161. select ICST307
  162. select GENERIC_TIME
  163. select GENERIC_CLOCKEVENTS
  164. help
  165. This enables support for ARM Ltd Versatile board.
  166. config ARCH_AT91
  167. bool "Atmel AT91"
  168. select GENERIC_GPIO
  169. help
  170. This enables support for systems based on the Atmel AT91RM9200,
  171. AT91SAM9 and AT91CAP9 processors.
  172. config ARCH_CLPS7500
  173. bool "Cirrus CL-PS7500FE"
  174. select TIMER_ACORN
  175. select ISA
  176. select NO_IOPORT
  177. select HAVE_IDE
  178. help
  179. Support for the Cirrus Logic PS7500FE system-on-a-chip.
  180. config ARCH_CLPS711X
  181. bool "Cirrus Logic CLPS711x/EP721x-based"
  182. help
  183. Support for Cirrus Logic 711x/721x based boards.
  184. config ARCH_CO285
  185. bool "Co-EBSA285"
  186. select FOOTBRIDGE
  187. select FOOTBRIDGE_ADDIN
  188. select HAVE_IDE
  189. help
  190. Support for Intel's EBSA285 companion chip.
  191. config ARCH_EBSA110
  192. bool "EBSA-110"
  193. select ISA
  194. select NO_IOPORT
  195. help
  196. This is an evaluation board for the StrongARM processor available
  197. from Digital. It has limited hardware on-board, including an
  198. Ethernet interface, two PCMCIA sockets, two serial ports and a
  199. parallel port.
  200. config ARCH_EP93XX
  201. bool "EP93xx-based"
  202. select ARM_AMBA
  203. select ARM_VIC
  204. select GENERIC_GPIO
  205. help
  206. This enables support for the Cirrus EP93xx series of CPUs.
  207. config ARCH_FOOTBRIDGE
  208. bool "FootBridge"
  209. select FOOTBRIDGE
  210. select HAVE_IDE
  211. help
  212. Support for systems based on the DC21285 companion chip
  213. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  214. config ARCH_NETX
  215. bool "Hilscher NetX based"
  216. select ARM_VIC
  217. help
  218. This enables support for systems based on the Hilscher NetX Soc
  219. config ARCH_H720X
  220. bool "Hynix HMS720x-based"
  221. select ISA_DMA_API
  222. help
  223. This enables support for systems based on the Hynix HMS720x
  224. config ARCH_IMX
  225. bool "IMX"
  226. select GENERIC_GPIO
  227. select GENERIC_TIME
  228. select GENERIC_CLOCKEVENTS
  229. help
  230. Support for Motorola's i.MX family of processors (MX1, MXL).
  231. config ARCH_IOP13XX
  232. bool "IOP13xx-based"
  233. depends on MMU
  234. select PLAT_IOP
  235. select PCI
  236. select ARCH_SUPPORTS_MSI
  237. help
  238. Support for Intel's IOP13XX (XScale) family of processors.
  239. config ARCH_IOP32X
  240. bool "IOP32x-based"
  241. depends on MMU
  242. select PLAT_IOP
  243. select PCI
  244. select HAVE_IDE
  245. help
  246. Support for Intel's 80219 and IOP32X (XScale) family of
  247. processors.
  248. config ARCH_IOP33X
  249. bool "IOP33x-based"
  250. depends on MMU
  251. select PLAT_IOP
  252. select PCI
  253. select HAVE_IDE
  254. help
  255. Support for Intel's IOP33X (XScale) family of processors.
  256. config ARCH_IXP23XX
  257. bool "IXP23XX-based"
  258. depends on MMU
  259. select HAVE_IDE
  260. select PCI
  261. help
  262. Support for Intel's IXP23xx (XScale) family of processors.
  263. config ARCH_IXP2000
  264. bool "IXP2400/2800-based"
  265. depends on MMU
  266. select PCI
  267. help
  268. Support for Intel's IXP2400/2800 (XScale) family of processors.
  269. config ARCH_IXP4XX
  270. bool "IXP4xx-based"
  271. depends on MMU
  272. select GENERIC_GPIO
  273. select GENERIC_TIME
  274. select GENERIC_CLOCKEVENTS
  275. select HAVE_IDE
  276. help
  277. Support for Intel's IXP4XX (XScale) family of processors.
  278. config ARCH_L7200
  279. bool "LinkUp-L7200"
  280. select FIQ
  281. select HAVE_IDE
  282. help
  283. Say Y here if you intend to run this kernel on a LinkUp Systems
  284. L7200 Software Development Board which uses an ARM720T processor.
  285. Information on this board can be obtained at:
  286. <http://www.linkupsys.com/>
  287. If you have any questions or comments about the Linux kernel port
  288. to this board, send e-mail to <sjhill@cotw.com>.
  289. config ARCH_KS8695
  290. bool "Micrel/Kendin KS8695"
  291. select GENERIC_GPIO
  292. help
  293. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  294. System-on-Chip devices.
  295. config ARCH_NS9XXX
  296. bool "NetSilicon NS9xxx"
  297. select GENERIC_GPIO
  298. select GENERIC_TIME
  299. select GENERIC_CLOCKEVENTS
  300. help
  301. Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
  302. System.
  303. <http://www.digi.com/products/microprocessors/index.jsp>
  304. config ARCH_MXC
  305. bool "Freescale MXC/iMX-based"
  306. select ARCH_MTD_XIP
  307. help
  308. Support for Freescale MXC/iMX-based family of processors
  309. config ARCH_ORION5X
  310. bool "Marvell Orion"
  311. depends on MMU
  312. select PCI
  313. select GENERIC_GPIO
  314. select GENERIC_TIME
  315. select GENERIC_CLOCKEVENTS
  316. select PLAT_ORION
  317. help
  318. Support for the following Marvell Orion 5x series SoCs:
  319. Orion-1 (5181), Orion-NAS (5182), Orion-2 (5281.)
  320. config ARCH_PNX4008
  321. bool "Philips Nexperia PNX4008 Mobile"
  322. help
  323. This enables support for Philips PNX4008 mobile platform.
  324. config ARCH_PXA
  325. bool "PXA2xx/PXA3xx-based"
  326. depends on MMU
  327. select ARCH_MTD_XIP
  328. select GENERIC_GPIO
  329. select HAVE_IDE
  330. select HAVE_GPIO_LIB
  331. select GENERIC_TIME
  332. select GENERIC_CLOCKEVENTS
  333. select TICK_ONESHOT
  334. help
  335. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  336. config ARCH_RPC
  337. bool "RiscPC"
  338. select ARCH_ACORN
  339. select FIQ
  340. select TIMER_ACORN
  341. select ARCH_MAY_HAVE_PC_FDC
  342. select ISA_DMA_API
  343. select NO_IOPORT
  344. select HAVE_IDE
  345. help
  346. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  347. CD-ROM interface, serial and parallel port, and the floppy drive.
  348. config ARCH_SA1100
  349. bool "SA1100-based"
  350. select ISA
  351. select ARCH_DISCONTIGMEM_ENABLE
  352. select ARCH_MTD_XIP
  353. select GENERIC_GPIO
  354. select GENERIC_TIME
  355. select HAVE_IDE
  356. help
  357. Support for StrongARM 11x0 based boards.
  358. config ARCH_S3C2410
  359. bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
  360. select GENERIC_GPIO
  361. select HAVE_IDE
  362. help
  363. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  364. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  365. the Samsung SMDK2410 development board (and derivatives).
  366. config ARCH_SHARK
  367. bool "Shark"
  368. select HAVE_IDE
  369. select ISA
  370. select ISA_DMA
  371. select PCI
  372. help
  373. Support for the StrongARM based Digital DNARD machine, also known
  374. as "Shark" (<http://www.shark-linux.de/shark.html>).
  375. config ARCH_LH7A40X
  376. bool "Sharp LH7A40X"
  377. select HAVE_IDE
  378. help
  379. Say Y here for systems based on one of the Sharp LH7A40X
  380. System on a Chip processors. These CPUs include an ARM922T
  381. core with a wide array of integrated devices for
  382. hand-held and low-power applications.
  383. config ARCH_DAVINCI
  384. bool "TI DaVinci"
  385. select GENERIC_TIME
  386. select GENERIC_CLOCKEVENTS
  387. select GENERIC_GPIO
  388. help
  389. Support for TI's DaVinci platform.
  390. config ARCH_OMAP
  391. bool "TI OMAP"
  392. select GENERIC_GPIO
  393. select GENERIC_TIME
  394. select GENERIC_CLOCKEVENTS
  395. help
  396. Support for TI's OMAP platform (OMAP1 and OMAP2).
  397. config ARCH_MSM7X00A
  398. bool "Qualcomm MSM7X00A"
  399. select GENERIC_TIME
  400. select GENERIC_CLOCKEVENTS
  401. help
  402. Support for Qualcomm MSM7X00A based systems. This runs on the ARM11
  403. apps processor of the MSM7X00A and depends on a shared memory
  404. interface to the ARM9 modem processor which runs the baseband stack
  405. and controls some vital subsystems (clock and power control, etc).
  406. <http://www.cdmatech.com/products/msm7200_chipset_solution.jsp>
  407. endchoice
  408. source "arch/arm/mach-clps711x/Kconfig"
  409. source "arch/arm/mach-ep93xx/Kconfig"
  410. source "arch/arm/mach-footbridge/Kconfig"
  411. source "arch/arm/mach-integrator/Kconfig"
  412. source "arch/arm/mach-iop32x/Kconfig"
  413. source "arch/arm/mach-iop33x/Kconfig"
  414. source "arch/arm/mach-iop13xx/Kconfig"
  415. source "arch/arm/mach-ixp4xx/Kconfig"
  416. source "arch/arm/mach-ixp2000/Kconfig"
  417. source "arch/arm/mach-ixp23xx/Kconfig"
  418. source "arch/arm/mach-pxa/Kconfig"
  419. source "arch/arm/mach-sa1100/Kconfig"
  420. source "arch/arm/plat-omap/Kconfig"
  421. source "arch/arm/mach-omap1/Kconfig"
  422. source "arch/arm/mach-omap2/Kconfig"
  423. source "arch/arm/mach-orion5x/Kconfig"
  424. source "arch/arm/plat-s3c24xx/Kconfig"
  425. source "arch/arm/plat-s3c/Kconfig"
  426. if ARCH_S3C2410
  427. source "arch/arm/mach-s3c2400/Kconfig"
  428. source "arch/arm/mach-s3c2410/Kconfig"
  429. source "arch/arm/mach-s3c2412/Kconfig"
  430. source "arch/arm/mach-s3c2440/Kconfig"
  431. source "arch/arm/mach-s3c2442/Kconfig"
  432. source "arch/arm/mach-s3c2443/Kconfig"
  433. endif
  434. source "arch/arm/mach-lh7a40x/Kconfig"
  435. source "arch/arm/mach-imx/Kconfig"
  436. source "arch/arm/mach-h720x/Kconfig"
  437. source "arch/arm/mach-versatile/Kconfig"
  438. source "arch/arm/mach-aaec2000/Kconfig"
  439. source "arch/arm/mach-realview/Kconfig"
  440. source "arch/arm/mach-at91/Kconfig"
  441. source "arch/arm/plat-mxc/Kconfig"
  442. source "arch/arm/mach-netx/Kconfig"
  443. source "arch/arm/mach-ns9xxx/Kconfig"
  444. source "arch/arm/mach-davinci/Kconfig"
  445. source "arch/arm/mach-ks8695/Kconfig"
  446. source "arch/arm/mach-msm/Kconfig"
  447. # Definitions to make life easier
  448. config ARCH_ACORN
  449. bool
  450. config PLAT_IOP
  451. bool
  452. config PLAT_ORION
  453. bool
  454. source arch/arm/mm/Kconfig
  455. config IWMMXT
  456. bool "Enable iWMMXt support"
  457. depends on CPU_XSCALE || CPU_XSC3
  458. default y if PXA27x || PXA3xx
  459. help
  460. Enable support for iWMMXt context switching at run time if
  461. running on a CPU that supports it.
  462. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  463. config XSCALE_PMU
  464. bool
  465. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  466. default y
  467. if !MMU
  468. source "arch/arm/Kconfig-nommu"
  469. endif
  470. endmenu
  471. source "arch/arm/common/Kconfig"
  472. config FORCE_MAX_ZONEORDER
  473. int
  474. depends on SA1111
  475. default "9"
  476. menu "Bus support"
  477. config ARM_AMBA
  478. bool
  479. config ISA
  480. bool
  481. help
  482. Find out whether you have ISA slots on your motherboard. ISA is the
  483. name of a bus system, i.e. the way the CPU talks to the other stuff
  484. inside your box. Other bus systems are PCI, EISA, MicroChannel
  485. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  486. newer boards don't support it. If you have ISA, say Y, otherwise N.
  487. # Select ISA DMA controller support
  488. config ISA_DMA
  489. bool
  490. select ISA_DMA_API
  491. # Select ISA DMA interface
  492. config ISA_DMA_API
  493. bool
  494. config PCI
  495. bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
  496. help
  497. Find out whether you have a PCI motherboard. PCI is the name of a
  498. bus system, i.e. the way the CPU talks to the other stuff inside
  499. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  500. VESA. If you have PCI, say Y, otherwise N.
  501. config PCI_SYSCALL
  502. def_bool PCI
  503. # Select the host bridge type
  504. config PCI_HOST_VIA82C505
  505. bool
  506. depends on PCI && ARCH_SHARK
  507. default y
  508. config PCI_HOST_ITE8152
  509. bool
  510. depends on PCI && MACH_ARMCORE
  511. default y
  512. select DMABOUNCE
  513. source "drivers/pci/Kconfig"
  514. source "drivers/pcmcia/Kconfig"
  515. endmenu
  516. menu "Kernel Features"
  517. source "kernel/time/Kconfig"
  518. config SMP
  519. bool "Symmetric Multi-Processing (EXPERIMENTAL)"
  520. depends on EXPERIMENTAL && REALVIEW_EB_ARM11MP
  521. help
  522. This enables support for systems with more than one CPU. If you have
  523. a system with only one CPU, like most personal computers, say N. If
  524. you have a system with more than one CPU, say Y.
  525. If you say N here, the kernel will run on single and multiprocessor
  526. machines, but will use only one CPU of a multiprocessor machine. If
  527. you say Y here, the kernel will run on many, but not all, single
  528. processor machines. On a single processor machine, the kernel will
  529. run faster if you say N here.
  530. See also <file:Documentation/i386/IO-APIC.txt>,
  531. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  532. <http://www.linuxdoc.org/docs.html#howto>.
  533. If you don't know what to do here, say N.
  534. config NR_CPUS
  535. int "Maximum number of CPUs (2-32)"
  536. range 2 32
  537. depends on SMP
  538. default "4"
  539. config HOTPLUG_CPU
  540. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  541. depends on SMP && HOTPLUG && EXPERIMENTAL
  542. help
  543. Say Y here to experiment with turning CPUs off and on. CPUs
  544. can be controlled through /sys/devices/system/cpu.
  545. config LOCAL_TIMERS
  546. bool "Use local timer interrupts"
  547. depends on SMP && REALVIEW_EB_ARM11MP
  548. default y
  549. help
  550. Enable support for local timers on SMP platforms, rather then the
  551. legacy IPI broadcast method. Local timers allows the system
  552. accounting to be spread across the timer interval, preventing a
  553. "thundering herd" at every timer tick.
  554. config PREEMPT
  555. bool "Preemptible Kernel (EXPERIMENTAL)"
  556. depends on EXPERIMENTAL
  557. help
  558. This option reduces the latency of the kernel when reacting to
  559. real-time or interactive events by allowing a low priority process to
  560. be preempted even if it is in kernel mode executing a system call.
  561. This allows applications to run more reliably even when the system is
  562. under load.
  563. Say Y here if you are building a kernel for a desktop, embedded
  564. or real-time system. Say N if you are unsure.
  565. config NO_IDLE_HZ
  566. bool "Dynamic tick timer"
  567. depends on !GENERIC_CLOCKEVENTS
  568. help
  569. Select this option if you want to disable continuous timer ticks
  570. and have them programmed to occur as required. This option saves
  571. power as the system can remain in idle state for longer.
  572. By default dynamic tick is disabled during the boot, and can be
  573. manually enabled with:
  574. echo 1 > /sys/devices/system/timer/timer0/dyn_tick
  575. Alternatively, if you want dynamic tick automatically enabled
  576. during boot, pass "dyntick=enable" via the kernel command string.
  577. Please note that dynamic tick may affect the accuracy of
  578. timekeeping on some platforms depending on the implementation.
  579. Currently at least OMAP, PXA2xx and SA11x0 platforms are known
  580. to have accurate timekeeping with dynamic tick.
  581. config HZ
  582. int
  583. default 128 if ARCH_L7200
  584. default 200 if ARCH_EBSA110 || ARCH_S3C2410
  585. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  586. default AT91_TIMER_HZ if ARCH_AT91
  587. default 100
  588. config AEABI
  589. bool "Use the ARM EABI to compile the kernel"
  590. help
  591. This option allows for the kernel to be compiled using the latest
  592. ARM ABI (aka EABI). This is only useful if you are using a user
  593. space environment that is also compiled with EABI.
  594. Since there are major incompatibilities between the legacy ABI and
  595. EABI, especially with regard to structure member alignment, this
  596. option also changes the kernel syscall calling convention to
  597. disambiguate both ABIs and allow for backward compatibility support
  598. (selected with CONFIG_OABI_COMPAT).
  599. To use this you need GCC version 4.0.0 or later.
  600. config OABI_COMPAT
  601. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  602. depends on AEABI && EXPERIMENTAL
  603. default y
  604. help
  605. This option preserves the old syscall interface along with the
  606. new (ARM EABI) one. It also provides a compatibility layer to
  607. intercept syscalls that have structure arguments which layout
  608. in memory differs between the legacy ABI and the new ARM EABI
  609. (only for non "thumb" binaries). This option adds a tiny
  610. overhead to all syscalls and produces a slightly larger kernel.
  611. If you know you'll be using only pure EABI user space then you
  612. can say N here. If this option is not selected and you attempt
  613. to execute a legacy ABI binary then the result will be
  614. UNPREDICTABLE (in fact it can be predicted that it won't work
  615. at all). If in doubt say Y.
  616. config ARCH_DISCONTIGMEM_ENABLE
  617. bool
  618. default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)
  619. help
  620. Say Y to support efficient handling of discontiguous physical memory,
  621. for architectures which are either NUMA (Non-Uniform Memory Access)
  622. or have huge holes in the physical address space for other reasons.
  623. See <file:Documentation/vm/numa> for more.
  624. config NODES_SHIFT
  625. int
  626. default "4" if ARCH_LH7A40X
  627. default "2"
  628. depends on NEED_MULTIPLE_NODES
  629. source "mm/Kconfig"
  630. config LEDS
  631. bool "Timer and CPU usage LEDs"
  632. depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \
  633. ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \
  634. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  635. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  636. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  637. ARCH_AT91 || MACH_TRIZEPS4 || ARCH_DAVINCI || \
  638. ARCH_KS8695 || MACH_RD88F5182
  639. help
  640. If you say Y here, the LEDs on your machine will be used
  641. to provide useful information about your current system status.
  642. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  643. be able to select which LEDs are active using the options below. If
  644. you are compiling a kernel for the EBSA-110 or the LART however, the
  645. red LED will simply flash regularly to indicate that the system is
  646. still functional. It is safe to say Y here if you have a CATS
  647. system, but the driver will do nothing.
  648. config LEDS_TIMER
  649. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  650. OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  651. || MACH_OMAP_PERSEUS2
  652. depends on LEDS
  653. depends on !GENERIC_CLOCKEVENTS
  654. default y if ARCH_EBSA110
  655. help
  656. If you say Y here, one of the system LEDs (the green one on the
  657. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  658. will flash regularly to indicate that the system is still
  659. operational. This is mainly useful to kernel hackers who are
  660. debugging unstable kernels.
  661. The LART uses the same LED for both Timer LED and CPU usage LED
  662. functions. You may choose to use both, but the Timer LED function
  663. will overrule the CPU usage LED.
  664. config LEDS_CPU
  665. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  666. !ARCH_OMAP) \
  667. || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  668. || MACH_OMAP_PERSEUS2
  669. depends on LEDS
  670. help
  671. If you say Y here, the red LED will be used to give a good real
  672. time indication of CPU usage, by lighting whenever the idle task
  673. is not currently executing.
  674. The LART uses the same LED for both Timer LED and CPU usage LED
  675. functions. You may choose to use both, but the Timer LED function
  676. will overrule the CPU usage LED.
  677. config ALIGNMENT_TRAP
  678. bool
  679. depends on CPU_CP15_MMU
  680. default y if !ARCH_EBSA110
  681. help
  682. ARM processors cannot fetch/store information which is not
  683. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  684. address divisible by 4. On 32-bit ARM processors, these non-aligned
  685. fetch/store instructions will be emulated in software if you say
  686. here, which has a severe performance impact. This is necessary for
  687. correct operation of some network protocols. With an IP-only
  688. configuration it is safe to say N, otherwise say Y.
  689. endmenu
  690. menu "Boot options"
  691. # Compressed boot loader in ROM. Yes, we really want to ask about
  692. # TEXT and BSS so we preserve their values in the config files.
  693. config ZBOOT_ROM_TEXT
  694. hex "Compressed ROM boot loader base address"
  695. default "0"
  696. help
  697. The physical address at which the ROM-able zImage is to be
  698. placed in the target. Platforms which normally make use of
  699. ROM-able zImage formats normally set this to a suitable
  700. value in their defconfig file.
  701. If ZBOOT_ROM is not enabled, this has no effect.
  702. config ZBOOT_ROM_BSS
  703. hex "Compressed ROM boot loader BSS address"
  704. default "0"
  705. help
  706. The base address of an area of read/write memory in the target
  707. for the ROM-able zImage which must be available while the
  708. decompressor is running. It must be large enough to hold the
  709. entire decompressed kernel plus an additional 128 KiB.
  710. Platforms which normally make use of ROM-able zImage formats
  711. normally set this to a suitable value in their defconfig file.
  712. If ZBOOT_ROM is not enabled, this has no effect.
  713. config ZBOOT_ROM
  714. bool "Compressed boot loader in ROM/flash"
  715. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  716. help
  717. Say Y here if you intend to execute your compressed kernel image
  718. (zImage) directly from ROM or flash. If unsure, say N.
  719. config CMDLINE
  720. string "Default kernel command string"
  721. default ""
  722. help
  723. On some architectures (EBSA110 and CATS), there is currently no way
  724. for the boot loader to pass arguments to the kernel. For these
  725. architectures, you should supply some command-line options at build
  726. time by entering them here. As a minimum, you should specify the
  727. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  728. config XIP_KERNEL
  729. bool "Kernel Execute-In-Place from ROM"
  730. depends on !ZBOOT_ROM
  731. help
  732. Execute-In-Place allows the kernel to run from non-volatile storage
  733. directly addressable by the CPU, such as NOR flash. This saves RAM
  734. space since the text section of the kernel is not loaded from flash
  735. to RAM. Read-write sections, such as the data section and stack,
  736. are still copied to RAM. The XIP kernel is not compressed since
  737. it has to run directly from flash, so it will take more space to
  738. store it. The flash address used to link the kernel object files,
  739. and for storing it, is configuration dependent. Therefore, if you
  740. say Y here, you must know the proper physical address where to
  741. store the kernel image depending on your own flash memory usage.
  742. Also note that the make target becomes "make xipImage" rather than
  743. "make zImage" or "make Image". The final kernel binary to put in
  744. ROM memory will be arch/arm/boot/xipImage.
  745. If unsure, say N.
  746. config XIP_PHYS_ADDR
  747. hex "XIP Kernel Physical Location"
  748. depends on XIP_KERNEL
  749. default "0x00080000"
  750. help
  751. This is the physical address in your flash memory the kernel will
  752. be linked for and stored to. This address is dependent on your
  753. own flash usage.
  754. config KEXEC
  755. bool "Kexec system call (EXPERIMENTAL)"
  756. depends on EXPERIMENTAL
  757. help
  758. kexec is a system call that implements the ability to shutdown your
  759. current kernel, and to start another kernel. It is like a reboot
  760. but it is independent of the system firmware. And like a reboot
  761. you can start any kernel with it, not just Linux.
  762. It is an ongoing process to be certain the hardware in a machine
  763. is properly shutdown, so do not be surprised if this code does not
  764. initially work for you. It may help to enable device hotplugging
  765. support.
  766. config ATAGS_PROC
  767. bool "Export atags in procfs"
  768. depends on KEXEC
  769. default y
  770. help
  771. Should the atags used to boot the kernel be exported in an "atags"
  772. file in procfs. Useful with kexec.
  773. endmenu
  774. if (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP || ARCH_IMX || ARCH_PXA)
  775. menu "CPU Frequency scaling"
  776. source "drivers/cpufreq/Kconfig"
  777. config CPU_FREQ_SA1100
  778. bool
  779. depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT)
  780. default y
  781. config CPU_FREQ_SA1110
  782. bool
  783. depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3)
  784. default y
  785. config CPU_FREQ_INTEGRATOR
  786. tristate "CPUfreq driver for ARM Integrator CPUs"
  787. depends on ARCH_INTEGRATOR && CPU_FREQ
  788. default y
  789. help
  790. This enables the CPUfreq driver for ARM Integrator CPUs.
  791. For details, take a look at <file:Documentation/cpu-freq>.
  792. If in doubt, say Y.
  793. config CPU_FREQ_IMX
  794. tristate "CPUfreq driver for i.MX CPUs"
  795. depends on ARCH_IMX && CPU_FREQ
  796. default n
  797. help
  798. This enables the CPUfreq driver for i.MX CPUs.
  799. If in doubt, say N.
  800. config CPU_FREQ_PXA
  801. bool
  802. depends on CPU_FREQ && ARCH_PXA && PXA25x
  803. default y
  804. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  805. endmenu
  806. endif
  807. menu "Floating point emulation"
  808. comment "At least one emulation must be selected"
  809. config FPE_NWFPE
  810. bool "NWFPE math emulation"
  811. depends on !AEABI || OABI_COMPAT
  812. ---help---
  813. Say Y to include the NWFPE floating point emulator in the kernel.
  814. This is necessary to run most binaries. Linux does not currently
  815. support floating point hardware so you need to say Y here even if
  816. your machine has an FPA or floating point co-processor podule.
  817. You may say N here if you are going to load the Acorn FPEmulator
  818. early in the bootup.
  819. config FPE_NWFPE_XP
  820. bool "Support extended precision"
  821. depends on FPE_NWFPE
  822. help
  823. Say Y to include 80-bit support in the kernel floating-point
  824. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  825. Note that gcc does not generate 80-bit operations by default,
  826. so in most cases this option only enlarges the size of the
  827. floating point emulator without any good reason.
  828. You almost surely want to say N here.
  829. config FPE_FASTFPE
  830. bool "FastFPE math emulation (EXPERIMENTAL)"
  831. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  832. ---help---
  833. Say Y here to include the FAST floating point emulator in the kernel.
  834. This is an experimental much faster emulator which now also has full
  835. precision for the mantissa. It does not support any exceptions.
  836. It is very simple, and approximately 3-6 times faster than NWFPE.
  837. It should be sufficient for most programs. It may be not suitable
  838. for scientific calculations, but you have to check this for yourself.
  839. If you do not feel you need a faster FP emulation you should better
  840. choose NWFPE.
  841. config VFP
  842. bool "VFP-format floating point maths"
  843. depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  844. help
  845. Say Y to include VFP support code in the kernel. This is needed
  846. if your hardware includes a VFP unit.
  847. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  848. release notes and additional status information.
  849. Say N if your target does not have VFP hardware.
  850. config VFPv3
  851. bool
  852. depends on VFP
  853. default y if CPU_V7
  854. config NEON
  855. bool "Advanced SIMD (NEON) Extension support"
  856. depends on VFPv3 && CPU_V7
  857. help
  858. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  859. Extension.
  860. endmenu
  861. menu "Userspace binary formats"
  862. source "fs/Kconfig.binfmt"
  863. config ARTHUR
  864. tristate "RISC OS personality"
  865. depends on !AEABI
  866. help
  867. Say Y here to include the kernel code necessary if you want to run
  868. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  869. experimental; if this sounds frightening, say N and sleep in peace.
  870. You can also say M here to compile this support as a module (which
  871. will be called arthur).
  872. endmenu
  873. menu "Power management options"
  874. source "kernel/power/Kconfig"
  875. config ARCH_SUSPEND_POSSIBLE
  876. def_bool y
  877. endmenu
  878. source "net/Kconfig"
  879. menu "Device Drivers"
  880. source "drivers/base/Kconfig"
  881. source "drivers/connector/Kconfig"
  882. if ALIGNMENT_TRAP || !CPU_CP15_MMU
  883. source "drivers/mtd/Kconfig"
  884. endif
  885. source "drivers/parport/Kconfig"
  886. source "drivers/pnp/Kconfig"
  887. source "drivers/block/Kconfig"
  888. # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
  889. source "drivers/misc/Kconfig"
  890. source "drivers/ide/Kconfig"
  891. source "drivers/scsi/Kconfig"
  892. source "drivers/ata/Kconfig"
  893. source "drivers/md/Kconfig"
  894. source "drivers/message/fusion/Kconfig"
  895. source "drivers/ieee1394/Kconfig"
  896. source "drivers/message/i2o/Kconfig"
  897. source "drivers/net/Kconfig"
  898. source "drivers/isdn/Kconfig"
  899. # input before char - char/joystick depends on it. As does USB.
  900. source "drivers/input/Kconfig"
  901. source "drivers/char/Kconfig"
  902. source "drivers/i2c/Kconfig"
  903. source "drivers/spi/Kconfig"
  904. source "drivers/gpio/Kconfig"
  905. source "drivers/w1/Kconfig"
  906. source "drivers/power/Kconfig"
  907. source "drivers/hwmon/Kconfig"
  908. source "drivers/watchdog/Kconfig"
  909. source "drivers/ssb/Kconfig"
  910. #source "drivers/l3/Kconfig"
  911. source "drivers/mfd/Kconfig"
  912. source "drivers/media/Kconfig"
  913. source "drivers/video/Kconfig"
  914. source "sound/Kconfig"
  915. source "drivers/hid/Kconfig"
  916. source "drivers/usb/Kconfig"
  917. source "drivers/mmc/Kconfig"
  918. source "drivers/leds/Kconfig"
  919. source "drivers/rtc/Kconfig"
  920. source "drivers/dma/Kconfig"
  921. source "drivers/dca/Kconfig"
  922. endmenu
  923. source "fs/Kconfig"
  924. source "arch/arm/Kconfig.debug"
  925. source "security/Kconfig"
  926. source "crypto/Kconfig"
  927. source "lib/Kconfig"