Kconfig 43 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 HAVE_AOUT
  10. select HAVE_IDE
  11. select RTC_LIB
  12. select SYS_SUPPORTS_APM_EMULATION
  13. select GENERIC_ATOMIC64 if (!CPU_32v6K)
  14. select HAVE_OPROFILE
  15. select HAVE_ARCH_KGDB
  16. select HAVE_KPROBES if (!XIP_KERNEL)
  17. select HAVE_KRETPROBES if (HAVE_KPROBES)
  18. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  19. select HAVE_GENERIC_DMA_COHERENT
  20. select HAVE_KERNEL_GZIP
  21. select HAVE_KERNEL_LZO
  22. select HAVE_PERF_EVENTS
  23. select PERF_USE_VMALLOC
  24. help
  25. The ARM series is a line of low-power-consumption RISC chip designs
  26. licensed by ARM Ltd and targeted at embedded applications and
  27. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  28. manufactured, but legacy ARM-based PC hardware remains popular in
  29. Europe. There is an ARM Linux project with a web page at
  30. <http://www.arm.linux.org.uk/>.
  31. config HAVE_PWM
  32. bool
  33. config SYS_SUPPORTS_APM_EMULATION
  34. bool
  35. config GENERIC_GPIO
  36. bool
  37. config GENERIC_TIME
  38. bool
  39. config GENERIC_CLOCKEVENTS
  40. bool
  41. config GENERIC_CLOCKEVENTS_BROADCAST
  42. bool
  43. depends on GENERIC_CLOCKEVENTS
  44. default y if SMP && !LOCAL_TIMERS
  45. config HAVE_TCM
  46. bool
  47. select GENERIC_ALLOCATOR
  48. config HAVE_PROC_CPU
  49. bool
  50. config NO_IOPORT
  51. bool
  52. config EISA
  53. bool
  54. ---help---
  55. The Extended Industry Standard Architecture (EISA) bus was
  56. developed as an open alternative to the IBM MicroChannel bus.
  57. The EISA bus provided some of the features of the IBM MicroChannel
  58. bus while maintaining backward compatibility with cards made for
  59. the older ISA bus. The EISA bus saw limited use between 1988 and
  60. 1995 when it was made obsolete by the PCI bus.
  61. Say Y here if you are building a kernel for an EISA-based machine.
  62. Otherwise, say N.
  63. config SBUS
  64. bool
  65. config MCA
  66. bool
  67. help
  68. MicroChannel Architecture is found in some IBM PS/2 machines and
  69. laptops. It is a bus system similar to PCI or ISA. See
  70. <file:Documentation/mca.txt> (and especially the web page given
  71. there) before attempting to build an MCA bus kernel.
  72. config GENERIC_HARDIRQS
  73. bool
  74. default y
  75. config STACKTRACE_SUPPORT
  76. bool
  77. default y
  78. config HAVE_LATENCYTOP_SUPPORT
  79. bool
  80. depends on !SMP
  81. default y
  82. config LOCKDEP_SUPPORT
  83. bool
  84. default y
  85. config TRACE_IRQFLAGS_SUPPORT
  86. bool
  87. default y
  88. config HARDIRQS_SW_RESEND
  89. bool
  90. default y
  91. config GENERIC_IRQ_PROBE
  92. bool
  93. default y
  94. config GENERIC_LOCKBREAK
  95. bool
  96. default y
  97. depends on SMP && PREEMPT
  98. config RWSEM_GENERIC_SPINLOCK
  99. bool
  100. default y
  101. config RWSEM_XCHGADD_ALGORITHM
  102. bool
  103. config ARCH_HAS_ILOG2_U32
  104. bool
  105. config ARCH_HAS_ILOG2_U64
  106. bool
  107. config ARCH_HAS_CPUFREQ
  108. bool
  109. help
  110. Internal node to signify that the ARCH has CPUFREQ support
  111. and that the relevant menu configurations are displayed for
  112. it.
  113. config GENERIC_HWEIGHT
  114. bool
  115. default y
  116. config GENERIC_CALIBRATE_DELAY
  117. bool
  118. default y
  119. config ARCH_MAY_HAVE_PC_FDC
  120. bool
  121. config ZONE_DMA
  122. bool
  123. config NEED_DMA_MAP_STATE
  124. def_bool y
  125. config GENERIC_ISA_DMA
  126. bool
  127. config FIQ
  128. bool
  129. config ARCH_MTD_XIP
  130. bool
  131. config GENERIC_HARDIRQS_NO__DO_IRQ
  132. def_bool y
  133. config ARM_L1_CACHE_SHIFT_6
  134. bool
  135. help
  136. Setting ARM L1 cache line size to 64 Bytes.
  137. if OPROFILE
  138. config OPROFILE_ARMV6
  139. def_bool y
  140. depends on CPU_V6 && !SMP
  141. select OPROFILE_ARM11_CORE
  142. config OPROFILE_MPCORE
  143. def_bool y
  144. depends on CPU_V6 && SMP
  145. select OPROFILE_ARM11_CORE
  146. config OPROFILE_ARM11_CORE
  147. bool
  148. config OPROFILE_ARMV7
  149. def_bool y
  150. depends on CPU_V7 && !SMP
  151. bool
  152. endif
  153. config VECTORS_BASE
  154. hex
  155. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  156. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  157. default 0x00000000
  158. help
  159. The base address of exception vectors.
  160. source "init/Kconfig"
  161. source "kernel/Kconfig.freezer"
  162. menu "System Type"
  163. config MMU
  164. bool "MMU-based Paged Memory Management Support"
  165. default y
  166. help
  167. Select if you want MMU-based virtualised addressing space
  168. support by paged memory management. If unsure, say 'Y'.
  169. #
  170. # The "ARM system type" choice list is ordered alphabetically by option
  171. # text. Please add new entries in the option alphabetic order.
  172. #
  173. choice
  174. prompt "ARM system type"
  175. default ARCH_VERSATILE
  176. config ARCH_AAEC2000
  177. bool "Agilent AAEC-2000 based"
  178. select CPU_ARM920T
  179. select ARM_AMBA
  180. select HAVE_CLK
  181. help
  182. This enables support for systems based on the Agilent AAEC-2000
  183. config ARCH_INTEGRATOR
  184. bool "ARM Ltd. Integrator family"
  185. select ARM_AMBA
  186. select ARCH_HAS_CPUFREQ
  187. select HAVE_CLK
  188. select COMMON_CLKDEV
  189. select ICST525
  190. help
  191. Support for ARM's Integrator platform.
  192. config ARCH_REALVIEW
  193. bool "ARM Ltd. RealView family"
  194. select ARM_AMBA
  195. select HAVE_CLK
  196. select COMMON_CLKDEV
  197. select ICST307
  198. select GENERIC_TIME
  199. select GENERIC_CLOCKEVENTS
  200. select ARCH_WANT_OPTIONAL_GPIOLIB
  201. select GPIO_PL061 if GPIOLIB
  202. help
  203. This enables support for ARM Ltd RealView boards.
  204. config ARCH_VERSATILE
  205. bool "ARM Ltd. Versatile family"
  206. select ARM_AMBA
  207. select ARM_VIC
  208. select HAVE_CLK
  209. select COMMON_CLKDEV
  210. select ICST307
  211. select GENERIC_TIME
  212. select GENERIC_CLOCKEVENTS
  213. select ARCH_WANT_OPTIONAL_GPIOLIB
  214. help
  215. This enables support for ARM Ltd Versatile board.
  216. config ARCH_AT91
  217. bool "Atmel AT91"
  218. select GENERIC_GPIO
  219. select ARCH_REQUIRE_GPIOLIB
  220. select HAVE_CLK
  221. help
  222. This enables support for systems based on the Atmel AT91RM9200,
  223. AT91SAM9 and AT91CAP9 processors.
  224. config ARCH_BCMRING
  225. bool "Broadcom BCMRING"
  226. depends on MMU
  227. select CPU_V6
  228. select ARM_AMBA
  229. select COMMON_CLKDEV
  230. select GENERIC_TIME
  231. select GENERIC_CLOCKEVENTS
  232. select ARCH_WANT_OPTIONAL_GPIOLIB
  233. help
  234. Support for Broadcom's BCMRing platform.
  235. config ARCH_CLPS711X
  236. bool "Cirrus Logic CLPS711x/EP721x-based"
  237. select CPU_ARM720T
  238. help
  239. Support for Cirrus Logic 711x/721x based boards.
  240. config ARCH_CNS3XXX
  241. bool "Cavium Networks CNS3XXX family"
  242. select CPU_V6
  243. select GENERIC_TIME
  244. select GENERIC_CLOCKEVENTS
  245. select ARM_GIC
  246. help
  247. Support for Cavium Networks CNS3XXX platform.
  248. config ARCH_GEMINI
  249. bool "Cortina Systems Gemini"
  250. select CPU_FA526
  251. select GENERIC_GPIO
  252. select ARCH_REQUIRE_GPIOLIB
  253. help
  254. Support for the Cortina Systems Gemini family SoCs
  255. config ARCH_EBSA110
  256. bool "EBSA-110"
  257. select CPU_SA110
  258. select ISA
  259. select NO_IOPORT
  260. help
  261. This is an evaluation board for the StrongARM processor available
  262. from Digital. It has limited hardware on-board, including an
  263. Ethernet interface, two PCMCIA sockets, two serial ports and a
  264. parallel port.
  265. config ARCH_EP93XX
  266. bool "EP93xx-based"
  267. select CPU_ARM920T
  268. select ARM_AMBA
  269. select ARM_VIC
  270. select GENERIC_GPIO
  271. select HAVE_CLK
  272. select COMMON_CLKDEV
  273. select ARCH_REQUIRE_GPIOLIB
  274. select ARCH_HAS_HOLES_MEMORYMODEL
  275. help
  276. This enables support for the Cirrus EP93xx series of CPUs.
  277. config ARCH_FOOTBRIDGE
  278. bool "FootBridge"
  279. select CPU_SA110
  280. select FOOTBRIDGE
  281. help
  282. Support for systems based on the DC21285 companion chip
  283. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  284. config ARCH_MXC
  285. bool "Freescale MXC/iMX-based"
  286. select GENERIC_TIME
  287. select GENERIC_CLOCKEVENTS
  288. select ARCH_REQUIRE_GPIOLIB
  289. select HAVE_CLK
  290. select COMMON_CLKDEV
  291. help
  292. Support for Freescale MXC/iMX-based family of processors
  293. config ARCH_STMP3XXX
  294. bool "Freescale STMP3xxx"
  295. select CPU_ARM926T
  296. select HAVE_CLK
  297. select COMMON_CLKDEV
  298. select ARCH_REQUIRE_GPIOLIB
  299. select GENERIC_TIME
  300. select GENERIC_CLOCKEVENTS
  301. select GENERIC_GPIO
  302. select USB_ARCH_HAS_EHCI
  303. help
  304. Support for systems based on the Freescale 3xxx CPUs.
  305. config ARCH_NETX
  306. bool "Hilscher NetX based"
  307. select CPU_ARM926T
  308. select ARM_VIC
  309. select GENERIC_CLOCKEVENTS
  310. select GENERIC_TIME
  311. help
  312. This enables support for systems based on the Hilscher NetX Soc
  313. config ARCH_H720X
  314. bool "Hynix HMS720x-based"
  315. select CPU_ARM720T
  316. select ISA_DMA_API
  317. help
  318. This enables support for systems based on the Hynix HMS720x
  319. config ARCH_IOP13XX
  320. bool "IOP13xx-based"
  321. depends on MMU
  322. select CPU_XSC3
  323. select PLAT_IOP
  324. select PCI
  325. select ARCH_SUPPORTS_MSI
  326. select VMSPLIT_1G
  327. help
  328. Support for Intel's IOP13XX (XScale) family of processors.
  329. config ARCH_IOP32X
  330. bool "IOP32x-based"
  331. depends on MMU
  332. select CPU_XSCALE
  333. select PLAT_IOP
  334. select PCI
  335. select GENERIC_GPIO
  336. select ARCH_REQUIRE_GPIOLIB
  337. help
  338. Support for Intel's 80219 and IOP32X (XScale) family of
  339. processors.
  340. config ARCH_IOP33X
  341. bool "IOP33x-based"
  342. depends on MMU
  343. select CPU_XSCALE
  344. select PLAT_IOP
  345. select PCI
  346. select GENERIC_GPIO
  347. select ARCH_REQUIRE_GPIOLIB
  348. help
  349. Support for Intel's IOP33X (XScale) family of processors.
  350. config ARCH_IXP23XX
  351. bool "IXP23XX-based"
  352. depends on MMU
  353. select CPU_XSC3
  354. select PCI
  355. help
  356. Support for Intel's IXP23xx (XScale) family of processors.
  357. config ARCH_IXP2000
  358. bool "IXP2400/2800-based"
  359. depends on MMU
  360. select CPU_XSCALE
  361. select PCI
  362. help
  363. Support for Intel's IXP2400/2800 (XScale) family of processors.
  364. config ARCH_IXP4XX
  365. bool "IXP4xx-based"
  366. depends on MMU
  367. select CPU_XSCALE
  368. select GENERIC_GPIO
  369. select GENERIC_TIME
  370. select GENERIC_CLOCKEVENTS
  371. select DMABOUNCE if PCI
  372. help
  373. Support for Intel's IXP4XX (XScale) family of processors.
  374. config ARCH_L7200
  375. bool "LinkUp-L7200"
  376. select CPU_ARM720T
  377. select FIQ
  378. help
  379. Say Y here if you intend to run this kernel on a LinkUp Systems
  380. L7200 Software Development Board which uses an ARM720T processor.
  381. Information on this board can be obtained at:
  382. <http://www.linkupsys.com/>
  383. If you have any questions or comments about the Linux kernel port
  384. to this board, send e-mail to <sjhill@cotw.com>.
  385. config ARCH_DOVE
  386. bool "Marvell Dove"
  387. select PCI
  388. select GENERIC_GPIO
  389. select ARCH_REQUIRE_GPIOLIB
  390. select GENERIC_TIME
  391. select GENERIC_CLOCKEVENTS
  392. select PLAT_ORION
  393. help
  394. Support for the Marvell Dove SoC 88AP510
  395. config ARCH_KIRKWOOD
  396. bool "Marvell Kirkwood"
  397. select CPU_FEROCEON
  398. select PCI
  399. select GENERIC_GPIO
  400. select ARCH_REQUIRE_GPIOLIB
  401. select GENERIC_TIME
  402. select GENERIC_CLOCKEVENTS
  403. select PLAT_ORION
  404. help
  405. Support for the following Marvell Kirkwood series SoCs:
  406. 88F6180, 88F6192 and 88F6281.
  407. config ARCH_LOKI
  408. bool "Marvell Loki (88RC8480)"
  409. select CPU_FEROCEON
  410. select GENERIC_TIME
  411. select GENERIC_CLOCKEVENTS
  412. select PLAT_ORION
  413. help
  414. Support for the Marvell Loki (88RC8480) SoC.
  415. config ARCH_MV78XX0
  416. bool "Marvell MV78xx0"
  417. select CPU_FEROCEON
  418. select PCI
  419. select GENERIC_GPIO
  420. select ARCH_REQUIRE_GPIOLIB
  421. select GENERIC_TIME
  422. select GENERIC_CLOCKEVENTS
  423. select PLAT_ORION
  424. help
  425. Support for the following Marvell MV78xx0 series SoCs:
  426. MV781x0, MV782x0.
  427. config ARCH_ORION5X
  428. bool "Marvell Orion"
  429. depends on MMU
  430. select CPU_FEROCEON
  431. select PCI
  432. select GENERIC_GPIO
  433. select ARCH_REQUIRE_GPIOLIB
  434. select GENERIC_TIME
  435. select GENERIC_CLOCKEVENTS
  436. select PLAT_ORION
  437. help
  438. Support for the following Marvell Orion 5x series SoCs:
  439. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  440. Orion-2 (5281), Orion-1-90 (6183).
  441. config ARCH_MMP
  442. bool "Marvell PXA168/910/MMP2"
  443. depends on MMU
  444. select GENERIC_GPIO
  445. select ARCH_REQUIRE_GPIOLIB
  446. select HAVE_CLK
  447. select COMMON_CLKDEV
  448. select GENERIC_TIME
  449. select GENERIC_CLOCKEVENTS
  450. select TICK_ONESHOT
  451. select PLAT_PXA
  452. help
  453. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  454. config ARCH_KS8695
  455. bool "Micrel/Kendin KS8695"
  456. select CPU_ARM922T
  457. select GENERIC_GPIO
  458. select ARCH_REQUIRE_GPIOLIB
  459. help
  460. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  461. System-on-Chip devices.
  462. config ARCH_NS9XXX
  463. bool "NetSilicon NS9xxx"
  464. select CPU_ARM926T
  465. select GENERIC_GPIO
  466. select GENERIC_TIME
  467. select GENERIC_CLOCKEVENTS
  468. select HAVE_CLK
  469. help
  470. Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
  471. System.
  472. <http://www.digi.com/products/microprocessors/index.jsp>
  473. config ARCH_W90X900
  474. bool "Nuvoton W90X900 CPU"
  475. select CPU_ARM926T
  476. select ARCH_REQUIRE_GPIOLIB
  477. select GENERIC_GPIO
  478. select HAVE_CLK
  479. select COMMON_CLKDEV
  480. select GENERIC_TIME
  481. select GENERIC_CLOCKEVENTS
  482. help
  483. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  484. At present, the w90x900 has been renamed nuc900, regarding
  485. the ARM series product line, you can login the following
  486. link address to know more.
  487. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  488. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  489. config ARCH_NUC93X
  490. bool "Nuvoton NUC93X CPU"
  491. select CPU_ARM926T
  492. select HAVE_CLK
  493. select COMMON_CLKDEV
  494. help
  495. Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
  496. low-power and high performance MPEG-4/JPEG multimedia controller chip.
  497. config ARCH_PNX4008
  498. bool "Philips Nexperia PNX4008 Mobile"
  499. select CPU_ARM926T
  500. select HAVE_CLK
  501. select COMMON_CLKDEV
  502. help
  503. This enables support for Philips PNX4008 mobile platform.
  504. config ARCH_PXA
  505. bool "PXA2xx/PXA3xx-based"
  506. depends on MMU
  507. select ARCH_MTD_XIP
  508. select ARCH_HAS_CPUFREQ
  509. select GENERIC_GPIO
  510. select HAVE_CLK
  511. select COMMON_CLKDEV
  512. select ARCH_REQUIRE_GPIOLIB
  513. select GENERIC_TIME
  514. select GENERIC_CLOCKEVENTS
  515. select TICK_ONESHOT
  516. select PLAT_PXA
  517. help
  518. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  519. config ARCH_MSM
  520. bool "Qualcomm MSM"
  521. select CPU_V6
  522. select GENERIC_TIME
  523. select GENERIC_CLOCKEVENTS
  524. help
  525. Support for Qualcomm MSM7K based systems. This runs on the ARM11
  526. apps processor of the MSM7K and depends on a shared memory
  527. interface to the ARM9 modem processor which runs the baseband stack
  528. and controls some vital subsystems (clock and power control, etc).
  529. config ARCH_SHMOBILE
  530. bool "Renesas SH-Mobile"
  531. help
  532. Support for Renesas's SH-Mobile ARM platforms
  533. config ARCH_RPC
  534. bool "RiscPC"
  535. select ARCH_ACORN
  536. select FIQ
  537. select TIMER_ACORN
  538. select ARCH_MAY_HAVE_PC_FDC
  539. select HAVE_PATA_PLATFORM
  540. select ISA_DMA_API
  541. select NO_IOPORT
  542. select ARCH_SPARSEMEM_ENABLE
  543. help
  544. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  545. CD-ROM interface, serial and parallel port, and the floppy drive.
  546. config ARCH_SA1100
  547. bool "SA1100-based"
  548. select CPU_SA1100
  549. select ISA
  550. select ARCH_SPARSEMEM_ENABLE
  551. select ARCH_MTD_XIP
  552. select ARCH_HAS_CPUFREQ
  553. select CPU_FREQ
  554. select GENERIC_GPIO
  555. select GENERIC_TIME
  556. select GENERIC_CLOCKEVENTS
  557. select HAVE_CLK
  558. select TICK_ONESHOT
  559. select ARCH_REQUIRE_GPIOLIB
  560. help
  561. Support for StrongARM 11x0 based boards.
  562. config ARCH_S3C2410
  563. bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
  564. select GENERIC_GPIO
  565. select ARCH_HAS_CPUFREQ
  566. select HAVE_CLK
  567. help
  568. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  569. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  570. the Samsung SMDK2410 development board (and derivatives).
  571. config ARCH_S3C64XX
  572. bool "Samsung S3C64XX"
  573. select PLAT_SAMSUNG
  574. select CPU_V6
  575. select GENERIC_GPIO
  576. select ARM_VIC
  577. select HAVE_CLK
  578. select NO_IOPORT
  579. select ARCH_HAS_CPUFREQ
  580. select ARCH_REQUIRE_GPIOLIB
  581. select SAMSUNG_CLKSRC
  582. select SAMSUNG_IRQ_VIC_TIMER
  583. select SAMSUNG_IRQ_UART
  584. select S3C_GPIO_TRACK
  585. select S3C_GPIO_PULL_UPDOWN
  586. select S3C_GPIO_CFG_S3C24XX
  587. select S3C_GPIO_CFG_S3C64XX
  588. select S3C_DEV_NAND
  589. select USB_ARCH_HAS_OHCI
  590. select SAMSUNG_GPIOLIB_4BIT
  591. help
  592. Samsung S3C64XX series based systems
  593. config ARCH_S5P6440
  594. bool "Samsung S5P6440"
  595. select CPU_V6
  596. select GENERIC_GPIO
  597. select HAVE_CLK
  598. help
  599. Samsung S5P6440 CPU based systems
  600. config ARCH_S5P6442
  601. bool "Samsung S5P6442"
  602. select CPU_V6
  603. select GENERIC_GPIO
  604. select HAVE_CLK
  605. help
  606. Samsung S5P6442 CPU based systems
  607. config ARCH_S5PC1XX
  608. bool "Samsung S5PC1XX"
  609. select GENERIC_GPIO
  610. select HAVE_CLK
  611. select CPU_V7
  612. select ARM_L1_CACHE_SHIFT_6
  613. help
  614. Samsung S5PC1XX series based systems
  615. config ARCH_S5PV210
  616. bool "Samsung S5PV210/S5PC110"
  617. select CPU_V7
  618. select GENERIC_GPIO
  619. select HAVE_CLK
  620. select ARM_L1_CACHE_SHIFT_6
  621. help
  622. Samsung S5PV210/S5PC110 series based systems
  623. config ARCH_SHARK
  624. bool "Shark"
  625. select CPU_SA110
  626. select ISA
  627. select ISA_DMA
  628. select ZONE_DMA
  629. select PCI
  630. help
  631. Support for the StrongARM based Digital DNARD machine, also known
  632. as "Shark" (<http://www.shark-linux.de/shark.html>).
  633. config ARCH_LH7A40X
  634. bool "Sharp LH7A40X"
  635. select CPU_ARM922T
  636. select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
  637. select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
  638. help
  639. Say Y here for systems based on one of the Sharp LH7A40X
  640. System on a Chip processors. These CPUs include an ARM922T
  641. core with a wide array of integrated devices for
  642. hand-held and low-power applications.
  643. config ARCH_U300
  644. bool "ST-Ericsson U300 Series"
  645. depends on MMU
  646. select CPU_ARM926T
  647. select HAVE_TCM
  648. select ARM_AMBA
  649. select ARM_VIC
  650. select GENERIC_TIME
  651. select GENERIC_CLOCKEVENTS
  652. select HAVE_CLK
  653. select COMMON_CLKDEV
  654. select GENERIC_GPIO
  655. help
  656. Support for ST-Ericsson U300 series mobile platforms.
  657. config ARCH_U8500
  658. bool "ST-Ericsson U8500 Series"
  659. select CPU_V7
  660. select ARM_AMBA
  661. select GENERIC_TIME
  662. select GENERIC_CLOCKEVENTS
  663. select COMMON_CLKDEV
  664. help
  665. Support for ST-Ericsson's Ux500 architecture
  666. config ARCH_NOMADIK
  667. bool "STMicroelectronics Nomadik"
  668. select ARM_AMBA
  669. select ARM_VIC
  670. select CPU_ARM926T
  671. select HAVE_CLK
  672. select COMMON_CLKDEV
  673. select GENERIC_TIME
  674. select GENERIC_CLOCKEVENTS
  675. select GENERIC_GPIO
  676. select ARCH_REQUIRE_GPIOLIB
  677. help
  678. Support for the Nomadik platform by ST-Ericsson
  679. config ARCH_DAVINCI
  680. bool "TI DaVinci"
  681. select CPU_ARM926T
  682. select GENERIC_TIME
  683. select GENERIC_CLOCKEVENTS
  684. select GENERIC_GPIO
  685. select ARCH_REQUIRE_GPIOLIB
  686. select HAVE_CLK
  687. select ZONE_DMA
  688. select HAVE_IDE
  689. select COMMON_CLKDEV
  690. select GENERIC_ALLOCATOR
  691. select ARCH_HAS_HOLES_MEMORYMODEL
  692. help
  693. Support for TI's DaVinci platform.
  694. config ARCH_OMAP
  695. bool "TI OMAP"
  696. select GENERIC_GPIO
  697. select HAVE_CLK
  698. select ARCH_REQUIRE_GPIOLIB
  699. select ARCH_HAS_CPUFREQ
  700. select GENERIC_TIME
  701. select GENERIC_CLOCKEVENTS
  702. select ARCH_HAS_HOLES_MEMORYMODEL
  703. help
  704. Support for TI's OMAP platform (OMAP1 and OMAP2).
  705. endchoice
  706. #
  707. # This is sorted alphabetically by mach-* pathname. However, plat-*
  708. # Kconfigs may be included either alphabetically (according to the
  709. # plat- suffix) or along side the corresponding mach-* source.
  710. #
  711. source "arch/arm/mach-aaec2000/Kconfig"
  712. source "arch/arm/mach-at91/Kconfig"
  713. source "arch/arm/mach-bcmring/Kconfig"
  714. source "arch/arm/mach-clps711x/Kconfig"
  715. source "arch/arm/mach-cns3xxx/Kconfig"
  716. source "arch/arm/mach-davinci/Kconfig"
  717. source "arch/arm/mach-dove/Kconfig"
  718. source "arch/arm/mach-ep93xx/Kconfig"
  719. source "arch/arm/mach-footbridge/Kconfig"
  720. source "arch/arm/mach-gemini/Kconfig"
  721. source "arch/arm/mach-h720x/Kconfig"
  722. source "arch/arm/mach-integrator/Kconfig"
  723. source "arch/arm/mach-iop32x/Kconfig"
  724. source "arch/arm/mach-iop33x/Kconfig"
  725. source "arch/arm/mach-iop13xx/Kconfig"
  726. source "arch/arm/mach-ixp4xx/Kconfig"
  727. source "arch/arm/mach-ixp2000/Kconfig"
  728. source "arch/arm/mach-ixp23xx/Kconfig"
  729. source "arch/arm/mach-kirkwood/Kconfig"
  730. source "arch/arm/mach-ks8695/Kconfig"
  731. source "arch/arm/mach-lh7a40x/Kconfig"
  732. source "arch/arm/mach-loki/Kconfig"
  733. source "arch/arm/mach-msm/Kconfig"
  734. source "arch/arm/mach-mv78xx0/Kconfig"
  735. source "arch/arm/plat-mxc/Kconfig"
  736. source "arch/arm/mach-netx/Kconfig"
  737. source "arch/arm/mach-nomadik/Kconfig"
  738. source "arch/arm/plat-nomadik/Kconfig"
  739. source "arch/arm/mach-ns9xxx/Kconfig"
  740. source "arch/arm/mach-nuc93x/Kconfig"
  741. source "arch/arm/plat-omap/Kconfig"
  742. source "arch/arm/mach-omap1/Kconfig"
  743. source "arch/arm/mach-omap2/Kconfig"
  744. source "arch/arm/mach-orion5x/Kconfig"
  745. source "arch/arm/mach-pxa/Kconfig"
  746. source "arch/arm/plat-pxa/Kconfig"
  747. source "arch/arm/mach-mmp/Kconfig"
  748. source "arch/arm/mach-realview/Kconfig"
  749. source "arch/arm/mach-sa1100/Kconfig"
  750. source "arch/arm/plat-samsung/Kconfig"
  751. source "arch/arm/plat-s3c24xx/Kconfig"
  752. source "arch/arm/plat-s5p/Kconfig"
  753. source "arch/arm/plat-s5pc1xx/Kconfig"
  754. if ARCH_S3C2410
  755. source "arch/arm/mach-s3c2400/Kconfig"
  756. source "arch/arm/mach-s3c2410/Kconfig"
  757. source "arch/arm/mach-s3c2412/Kconfig"
  758. source "arch/arm/mach-s3c2440/Kconfig"
  759. source "arch/arm/mach-s3c2443/Kconfig"
  760. endif
  761. if ARCH_S3C64XX
  762. source "arch/arm/mach-s3c64xx/Kconfig"
  763. endif
  764. source "arch/arm/mach-s5p6440/Kconfig"
  765. source "arch/arm/mach-s5p6442/Kconfig"
  766. if ARCH_S5PC1XX
  767. source "arch/arm/mach-s5pc100/Kconfig"
  768. endif
  769. source "arch/arm/mach-s5pv210/Kconfig"
  770. source "arch/arm/mach-shmobile/Kconfig"
  771. source "arch/arm/plat-stmp3xxx/Kconfig"
  772. source "arch/arm/mach-u300/Kconfig"
  773. source "arch/arm/mach-ux500/Kconfig"
  774. source "arch/arm/mach-versatile/Kconfig"
  775. source "arch/arm/mach-w90x900/Kconfig"
  776. # Definitions to make life easier
  777. config ARCH_ACORN
  778. bool
  779. config PLAT_IOP
  780. bool
  781. select GENERIC_CLOCKEVENTS
  782. select GENERIC_TIME
  783. config PLAT_ORION
  784. bool
  785. config PLAT_PXA
  786. bool
  787. source arch/arm/mm/Kconfig
  788. config IWMMXT
  789. bool "Enable iWMMXt support"
  790. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
  791. default y if PXA27x || PXA3xx || ARCH_MMP
  792. help
  793. Enable support for iWMMXt context switching at run time if
  794. running on a CPU that supports it.
  795. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  796. config XSCALE_PMU
  797. bool
  798. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  799. default y
  800. config CPU_HAS_PMU
  801. depends on CPU_V6 || CPU_V7 || XSCALE_PMU
  802. default y
  803. bool
  804. if !MMU
  805. source "arch/arm/Kconfig-nommu"
  806. endif
  807. config ARM_ERRATA_411920
  808. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  809. depends on CPU_V6 && !SMP
  810. help
  811. Invalidation of the Instruction Cache operation can
  812. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  813. It does not affect the MPCore. This option enables the ARM Ltd.
  814. recommended workaround.
  815. config ARM_ERRATA_430973
  816. bool "ARM errata: Stale prediction on replaced interworking branch"
  817. depends on CPU_V7
  818. help
  819. This option enables the workaround for the 430973 Cortex-A8
  820. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  821. interworking branch is replaced with another code sequence at the
  822. same virtual address, whether due to self-modifying code or virtual
  823. to physical address re-mapping, Cortex-A8 does not recover from the
  824. stale interworking branch prediction. This results in Cortex-A8
  825. executing the new code sequence in the incorrect ARM or Thumb state.
  826. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  827. and also flushes the branch target cache at every context switch.
  828. Note that setting specific bits in the ACTLR register may not be
  829. available in non-secure mode.
  830. config ARM_ERRATA_458693
  831. bool "ARM errata: Processor deadlock when a false hazard is created"
  832. depends on CPU_V7
  833. help
  834. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  835. erratum. For very specific sequences of memory operations, it is
  836. possible for a hazard condition intended for a cache line to instead
  837. be incorrectly associated with a different cache line. This false
  838. hazard might then cause a processor deadlock. The workaround enables
  839. the L1 caching of the NEON accesses and disables the PLD instruction
  840. in the ACTLR register. Note that setting specific bits in the ACTLR
  841. register may not be available in non-secure mode.
  842. config ARM_ERRATA_460075
  843. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  844. depends on CPU_V7
  845. help
  846. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  847. erratum. Any asynchronous access to the L2 cache may encounter a
  848. situation in which recent store transactions to the L2 cache are lost
  849. and overwritten with stale memory contents from external memory. The
  850. workaround disables the write-allocate mode for the L2 cache via the
  851. ACTLR register. Note that setting specific bits in the ACTLR register
  852. may not be available in non-secure mode.
  853. config PL310_ERRATA_588369
  854. bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
  855. depends on CACHE_L2X0 && ARCH_OMAP4
  856. help
  857. The PL310 L2 cache controller implements three types of Clean &
  858. Invalidate maintenance operations: by Physical Address
  859. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  860. They are architecturally defined to behave as the execution of a
  861. clean operation followed immediately by an invalidate operation,
  862. both performing to the same memory location. This functionality
  863. is not correctly implemented in PL310 as clean lines are not
  864. invalidated as a result of these operations. Note that this errata
  865. uses Texas Instrument's secure monitor api.
  866. endmenu
  867. source "arch/arm/common/Kconfig"
  868. config FORCE_MAX_ZONEORDER
  869. int
  870. depends on SA1111
  871. default "9"
  872. menu "Bus support"
  873. config ARM_AMBA
  874. bool
  875. config ISA
  876. bool
  877. help
  878. Find out whether you have ISA slots on your motherboard. ISA is the
  879. name of a bus system, i.e. the way the CPU talks to the other stuff
  880. inside your box. Other bus systems are PCI, EISA, MicroChannel
  881. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  882. newer boards don't support it. If you have ISA, say Y, otherwise N.
  883. # Select ISA DMA controller support
  884. config ISA_DMA
  885. bool
  886. select ISA_DMA_API
  887. # Select ISA DMA interface
  888. config ISA_DMA_API
  889. bool
  890. config PCI
  891. bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE
  892. help
  893. Find out whether you have a PCI motherboard. PCI is the name of a
  894. bus system, i.e. the way the CPU talks to the other stuff inside
  895. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  896. VESA. If you have PCI, say Y, otherwise N.
  897. config PCI_SYSCALL
  898. def_bool PCI
  899. # Select the host bridge type
  900. config PCI_HOST_VIA82C505
  901. bool
  902. depends on PCI && ARCH_SHARK
  903. default y
  904. config PCI_HOST_ITE8152
  905. bool
  906. depends on PCI && MACH_ARMCORE
  907. default y
  908. select DMABOUNCE
  909. source "drivers/pci/Kconfig"
  910. source "drivers/pcmcia/Kconfig"
  911. endmenu
  912. menu "Kernel Features"
  913. source "kernel/time/Kconfig"
  914. config SMP
  915. bool "Symmetric Multi-Processing (EXPERIMENTAL)"
  916. depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
  917. MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
  918. depends on GENERIC_CLOCKEVENTS
  919. select USE_GENERIC_SMP_HELPERS
  920. select HAVE_ARM_SCU if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
  921. help
  922. This enables support for systems with more than one CPU. If you have
  923. a system with only one CPU, like most personal computers, say N. If
  924. you have a system with more than one CPU, say Y.
  925. If you say N here, the kernel will run on single and multiprocessor
  926. machines, but will use only one CPU of a multiprocessor machine. If
  927. you say Y here, the kernel will run on many, but not all, single
  928. processor machines. On a single processor machine, the kernel will
  929. run faster if you say N here.
  930. See also <file:Documentation/i386/IO-APIC.txt>,
  931. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  932. <http://www.linuxdoc.org/docs.html#howto>.
  933. If you don't know what to do here, say N.
  934. config HAVE_ARM_SCU
  935. bool
  936. depends on SMP
  937. help
  938. This option enables support for the ARM system coherency unit
  939. config HAVE_ARM_TWD
  940. bool
  941. depends on SMP
  942. help
  943. This options enables support for the ARM timer and watchdog unit
  944. choice
  945. prompt "Memory split"
  946. default VMSPLIT_3G
  947. help
  948. Select the desired split between kernel and user memory.
  949. If you are not absolutely sure what you are doing, leave this
  950. option alone!
  951. config VMSPLIT_3G
  952. bool "3G/1G user/kernel split"
  953. config VMSPLIT_2G
  954. bool "2G/2G user/kernel split"
  955. config VMSPLIT_1G
  956. bool "1G/3G user/kernel split"
  957. endchoice
  958. config PAGE_OFFSET
  959. hex
  960. default 0x40000000 if VMSPLIT_1G
  961. default 0x80000000 if VMSPLIT_2G
  962. default 0xC0000000
  963. config NR_CPUS
  964. int "Maximum number of CPUs (2-32)"
  965. range 2 32
  966. depends on SMP
  967. default "4"
  968. config HOTPLUG_CPU
  969. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  970. depends on SMP && HOTPLUG && EXPERIMENTAL
  971. help
  972. Say Y here to experiment with turning CPUs off and on. CPUs
  973. can be controlled through /sys/devices/system/cpu.
  974. config LOCAL_TIMERS
  975. bool "Use local timer interrupts"
  976. depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
  977. REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || ARCH_U8500)
  978. default y
  979. select HAVE_ARM_TWD if (ARCH_REALVIEW || ARCH_OMAP4 || ARCH_U8500)
  980. help
  981. Enable support for local timers on SMP platforms, rather then the
  982. legacy IPI broadcast method. Local timers allows the system
  983. accounting to be spread across the timer interval, preventing a
  984. "thundering herd" at every timer tick.
  985. source kernel/Kconfig.preempt
  986. config HZ
  987. int
  988. default 128 if ARCH_L7200
  989. default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
  990. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  991. default AT91_TIMER_HZ if ARCH_AT91
  992. default 100
  993. config THUMB2_KERNEL
  994. bool "Compile the kernel in Thumb-2 mode"
  995. depends on CPU_V7 && EXPERIMENTAL
  996. select AEABI
  997. select ARM_ASM_UNIFIED
  998. help
  999. By enabling this option, the kernel will be compiled in
  1000. Thumb-2 mode. A compiler/assembler that understand the unified
  1001. ARM-Thumb syntax is needed.
  1002. If unsure, say N.
  1003. config ARM_ASM_UNIFIED
  1004. bool
  1005. config AEABI
  1006. bool "Use the ARM EABI to compile the kernel"
  1007. help
  1008. This option allows for the kernel to be compiled using the latest
  1009. ARM ABI (aka EABI). This is only useful if you are using a user
  1010. space environment that is also compiled with EABI.
  1011. Since there are major incompatibilities between the legacy ABI and
  1012. EABI, especially with regard to structure member alignment, this
  1013. option also changes the kernel syscall calling convention to
  1014. disambiguate both ABIs and allow for backward compatibility support
  1015. (selected with CONFIG_OABI_COMPAT).
  1016. To use this you need GCC version 4.0.0 or later.
  1017. config OABI_COMPAT
  1018. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1019. depends on AEABI && EXPERIMENTAL
  1020. default y
  1021. help
  1022. This option preserves the old syscall interface along with the
  1023. new (ARM EABI) one. It also provides a compatibility layer to
  1024. intercept syscalls that have structure arguments which layout
  1025. in memory differs between the legacy ABI and the new ARM EABI
  1026. (only for non "thumb" binaries). This option adds a tiny
  1027. overhead to all syscalls and produces a slightly larger kernel.
  1028. If you know you'll be using only pure EABI user space then you
  1029. can say N here. If this option is not selected and you attempt
  1030. to execute a legacy ABI binary then the result will be
  1031. UNPREDICTABLE (in fact it can be predicted that it won't work
  1032. at all). If in doubt say Y.
  1033. config ARCH_HAS_HOLES_MEMORYMODEL
  1034. bool
  1035. # Discontigmem is deprecated
  1036. config ARCH_DISCONTIGMEM_ENABLE
  1037. bool
  1038. config ARCH_SPARSEMEM_ENABLE
  1039. bool
  1040. config ARCH_SPARSEMEM_DEFAULT
  1041. def_bool ARCH_SPARSEMEM_ENABLE
  1042. config ARCH_SELECT_MEMORY_MODEL
  1043. def_bool ARCH_DISCONTIGMEM_ENABLE && ARCH_SPARSEMEM_ENABLE
  1044. config NODES_SHIFT
  1045. int
  1046. default "4" if ARCH_LH7A40X
  1047. default "2"
  1048. depends on NEED_MULTIPLE_NODES
  1049. config HIGHMEM
  1050. bool "High Memory Support (EXPERIMENTAL)"
  1051. depends on MMU && EXPERIMENTAL
  1052. help
  1053. The address space of ARM processors is only 4 Gigabytes large
  1054. and it has to accommodate user address space, kernel address
  1055. space as well as some memory mapped IO. That means that, if you
  1056. have a large amount of physical memory and/or IO, not all of the
  1057. memory can be "permanently mapped" by the kernel. The physical
  1058. memory that is not permanently mapped is called "high memory".
  1059. Depending on the selected kernel/user memory split, minimum
  1060. vmalloc space and actual amount of RAM, you may not need this
  1061. option which should result in a slightly faster kernel.
  1062. If unsure, say n.
  1063. config HIGHPTE
  1064. bool "Allocate 2nd-level pagetables from highmem"
  1065. depends on HIGHMEM
  1066. depends on !OUTER_CACHE
  1067. config HW_PERF_EVENTS
  1068. bool "Enable hardware performance counter support for perf events"
  1069. depends on PERF_EVENTS && CPU_HAS_PMU && (CPU_V6 || CPU_V7)
  1070. default y
  1071. help
  1072. Enable hardware performance counter support for perf events. If
  1073. disabled, perf events will use software events only.
  1074. source "mm/Kconfig"
  1075. config LEDS
  1076. bool "Timer and CPU usage LEDs"
  1077. depends on ARCH_CDB89712 || ARCH_EBSA110 || \
  1078. ARCH_EBSA285 || ARCH_INTEGRATOR || \
  1079. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  1080. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  1081. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  1082. ARCH_AT91 || ARCH_DAVINCI || \
  1083. ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
  1084. help
  1085. If you say Y here, the LEDs on your machine will be used
  1086. to provide useful information about your current system status.
  1087. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  1088. be able to select which LEDs are active using the options below. If
  1089. you are compiling a kernel for the EBSA-110 or the LART however, the
  1090. red LED will simply flash regularly to indicate that the system is
  1091. still functional. It is safe to say Y here if you have a CATS
  1092. system, but the driver will do nothing.
  1093. config LEDS_TIMER
  1094. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  1095. OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1096. || MACH_OMAP_PERSEUS2
  1097. depends on LEDS
  1098. depends on !GENERIC_CLOCKEVENTS
  1099. default y if ARCH_EBSA110
  1100. help
  1101. If you say Y here, one of the system LEDs (the green one on the
  1102. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  1103. will flash regularly to indicate that the system is still
  1104. operational. This is mainly useful to kernel hackers who are
  1105. debugging unstable kernels.
  1106. The LART uses the same LED for both Timer LED and CPU usage LED
  1107. functions. You may choose to use both, but the Timer LED function
  1108. will overrule the CPU usage LED.
  1109. config LEDS_CPU
  1110. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  1111. !ARCH_OMAP) \
  1112. || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1113. || MACH_OMAP_PERSEUS2
  1114. depends on LEDS
  1115. help
  1116. If you say Y here, the red LED will be used to give a good real
  1117. time indication of CPU usage, by lighting whenever the idle task
  1118. is not currently executing.
  1119. The LART uses the same LED for both Timer LED and CPU usage LED
  1120. functions. You may choose to use both, but the Timer LED function
  1121. will overrule the CPU usage LED.
  1122. config ALIGNMENT_TRAP
  1123. bool
  1124. depends on CPU_CP15_MMU
  1125. default y if !ARCH_EBSA110
  1126. select HAVE_PROC_CPU if PROC_FS
  1127. help
  1128. ARM processors cannot fetch/store information which is not
  1129. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1130. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1131. fetch/store instructions will be emulated in software if you say
  1132. here, which has a severe performance impact. This is necessary for
  1133. correct operation of some network protocols. With an IP-only
  1134. configuration it is safe to say N, otherwise say Y.
  1135. config UACCESS_WITH_MEMCPY
  1136. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
  1137. depends on MMU && EXPERIMENTAL
  1138. default y if CPU_FEROCEON
  1139. help
  1140. Implement faster copy_to_user and clear_user methods for CPU
  1141. cores where a 8-word STM instruction give significantly higher
  1142. memory write throughput than a sequence of individual 32bit stores.
  1143. A possible side effect is a slight increase in scheduling latency
  1144. between threads sharing the same address space if they invoke
  1145. such copy operations with large buffers.
  1146. However, if the CPU data cache is using a write-allocate mode,
  1147. this option is unlikely to provide any performance gain.
  1148. endmenu
  1149. menu "Boot options"
  1150. # Compressed boot loader in ROM. Yes, we really want to ask about
  1151. # TEXT and BSS so we preserve their values in the config files.
  1152. config ZBOOT_ROM_TEXT
  1153. hex "Compressed ROM boot loader base address"
  1154. default "0"
  1155. help
  1156. The physical address at which the ROM-able zImage is to be
  1157. placed in the target. Platforms which normally make use of
  1158. ROM-able zImage formats normally set this to a suitable
  1159. value in their defconfig file.
  1160. If ZBOOT_ROM is not enabled, this has no effect.
  1161. config ZBOOT_ROM_BSS
  1162. hex "Compressed ROM boot loader BSS address"
  1163. default "0"
  1164. help
  1165. The base address of an area of read/write memory in the target
  1166. for the ROM-able zImage which must be available while the
  1167. decompressor is running. It must be large enough to hold the
  1168. entire decompressed kernel plus an additional 128 KiB.
  1169. Platforms which normally make use of ROM-able zImage formats
  1170. normally set this to a suitable value in their defconfig file.
  1171. If ZBOOT_ROM is not enabled, this has no effect.
  1172. config ZBOOT_ROM
  1173. bool "Compressed boot loader in ROM/flash"
  1174. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1175. help
  1176. Say Y here if you intend to execute your compressed kernel image
  1177. (zImage) directly from ROM or flash. If unsure, say N.
  1178. config CMDLINE
  1179. string "Default kernel command string"
  1180. default ""
  1181. help
  1182. On some architectures (EBSA110 and CATS), there is currently no way
  1183. for the boot loader to pass arguments to the kernel. For these
  1184. architectures, you should supply some command-line options at build
  1185. time by entering them here. As a minimum, you should specify the
  1186. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1187. config XIP_KERNEL
  1188. bool "Kernel Execute-In-Place from ROM"
  1189. depends on !ZBOOT_ROM
  1190. help
  1191. Execute-In-Place allows the kernel to run from non-volatile storage
  1192. directly addressable by the CPU, such as NOR flash. This saves RAM
  1193. space since the text section of the kernel is not loaded from flash
  1194. to RAM. Read-write sections, such as the data section and stack,
  1195. are still copied to RAM. The XIP kernel is not compressed since
  1196. it has to run directly from flash, so it will take more space to
  1197. store it. The flash address used to link the kernel object files,
  1198. and for storing it, is configuration dependent. Therefore, if you
  1199. say Y here, you must know the proper physical address where to
  1200. store the kernel image depending on your own flash memory usage.
  1201. Also note that the make target becomes "make xipImage" rather than
  1202. "make zImage" or "make Image". The final kernel binary to put in
  1203. ROM memory will be arch/arm/boot/xipImage.
  1204. If unsure, say N.
  1205. config XIP_PHYS_ADDR
  1206. hex "XIP Kernel Physical Location"
  1207. depends on XIP_KERNEL
  1208. default "0x00080000"
  1209. help
  1210. This is the physical address in your flash memory the kernel will
  1211. be linked for and stored to. This address is dependent on your
  1212. own flash usage.
  1213. config KEXEC
  1214. bool "Kexec system call (EXPERIMENTAL)"
  1215. depends on EXPERIMENTAL
  1216. help
  1217. kexec is a system call that implements the ability to shutdown your
  1218. current kernel, and to start another kernel. It is like a reboot
  1219. but it is independent of the system firmware. And like a reboot
  1220. you can start any kernel with it, not just Linux.
  1221. It is an ongoing process to be certain the hardware in a machine
  1222. is properly shutdown, so do not be surprised if this code does not
  1223. initially work for you. It may help to enable device hotplugging
  1224. support.
  1225. config ATAGS_PROC
  1226. bool "Export atags in procfs"
  1227. depends on KEXEC
  1228. default y
  1229. help
  1230. Should the atags used to boot the kernel be exported in an "atags"
  1231. file in procfs. Useful with kexec.
  1232. endmenu
  1233. menu "CPU Power Management"
  1234. if ARCH_HAS_CPUFREQ
  1235. source "drivers/cpufreq/Kconfig"
  1236. config CPU_FREQ_SA1100
  1237. bool
  1238. config CPU_FREQ_SA1110
  1239. bool
  1240. config CPU_FREQ_INTEGRATOR
  1241. tristate "CPUfreq driver for ARM Integrator CPUs"
  1242. depends on ARCH_INTEGRATOR && CPU_FREQ
  1243. default y
  1244. help
  1245. This enables the CPUfreq driver for ARM Integrator CPUs.
  1246. For details, take a look at <file:Documentation/cpu-freq>.
  1247. If in doubt, say Y.
  1248. config CPU_FREQ_PXA
  1249. bool
  1250. depends on CPU_FREQ && ARCH_PXA && PXA25x
  1251. default y
  1252. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  1253. config CPU_FREQ_S3C64XX
  1254. bool "CPUfreq support for Samsung S3C64XX CPUs"
  1255. depends on CPU_FREQ && CPU_S3C6410
  1256. config CPU_FREQ_S3C
  1257. bool
  1258. help
  1259. Internal configuration node for common cpufreq on Samsung SoC
  1260. config CPU_FREQ_S3C24XX
  1261. bool "CPUfreq driver for Samsung S3C24XX series CPUs"
  1262. depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
  1263. select CPU_FREQ_S3C
  1264. help
  1265. This enables the CPUfreq driver for the Samsung S3C24XX family
  1266. of CPUs.
  1267. For details, take a look at <file:Documentation/cpu-freq>.
  1268. If in doubt, say N.
  1269. config CPU_FREQ_S3C24XX_PLL
  1270. bool "Support CPUfreq changing of PLL frequency"
  1271. depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
  1272. help
  1273. Compile in support for changing the PLL frequency from the
  1274. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1275. after a frequency change, so by default it is not enabled.
  1276. This also means that the PLL tables for the selected CPU(s) will
  1277. be built which may increase the size of the kernel image.
  1278. config CPU_FREQ_S3C24XX_DEBUG
  1279. bool "Debug CPUfreq Samsung driver core"
  1280. depends on CPU_FREQ_S3C24XX
  1281. help
  1282. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1283. config CPU_FREQ_S3C24XX_IODEBUG
  1284. bool "Debug CPUfreq Samsung driver IO timing"
  1285. depends on CPU_FREQ_S3C24XX
  1286. help
  1287. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1288. config CPU_FREQ_S3C24XX_DEBUGFS
  1289. bool "Export debugfs for CPUFreq"
  1290. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1291. help
  1292. Export status information via debugfs.
  1293. endif
  1294. source "drivers/cpuidle/Kconfig"
  1295. endmenu
  1296. menu "Floating point emulation"
  1297. comment "At least one emulation must be selected"
  1298. config FPE_NWFPE
  1299. bool "NWFPE math emulation"
  1300. depends on !AEABI || OABI_COMPAT
  1301. ---help---
  1302. Say Y to include the NWFPE floating point emulator in the kernel.
  1303. This is necessary to run most binaries. Linux does not currently
  1304. support floating point hardware so you need to say Y here even if
  1305. your machine has an FPA or floating point co-processor podule.
  1306. You may say N here if you are going to load the Acorn FPEmulator
  1307. early in the bootup.
  1308. config FPE_NWFPE_XP
  1309. bool "Support extended precision"
  1310. depends on FPE_NWFPE
  1311. help
  1312. Say Y to include 80-bit support in the kernel floating-point
  1313. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1314. Note that gcc does not generate 80-bit operations by default,
  1315. so in most cases this option only enlarges the size of the
  1316. floating point emulator without any good reason.
  1317. You almost surely want to say N here.
  1318. config FPE_FASTFPE
  1319. bool "FastFPE math emulation (EXPERIMENTAL)"
  1320. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  1321. ---help---
  1322. Say Y here to include the FAST floating point emulator in the kernel.
  1323. This is an experimental much faster emulator which now also has full
  1324. precision for the mantissa. It does not support any exceptions.
  1325. It is very simple, and approximately 3-6 times faster than NWFPE.
  1326. It should be sufficient for most programs. It may be not suitable
  1327. for scientific calculations, but you have to check this for yourself.
  1328. If you do not feel you need a faster FP emulation you should better
  1329. choose NWFPE.
  1330. config VFP
  1331. bool "VFP-format floating point maths"
  1332. depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1333. help
  1334. Say Y to include VFP support code in the kernel. This is needed
  1335. if your hardware includes a VFP unit.
  1336. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1337. release notes and additional status information.
  1338. Say N if your target does not have VFP hardware.
  1339. config VFPv3
  1340. bool
  1341. depends on VFP
  1342. default y if CPU_V7
  1343. config NEON
  1344. bool "Advanced SIMD (NEON) Extension support"
  1345. depends on VFPv3 && CPU_V7
  1346. help
  1347. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1348. Extension.
  1349. endmenu
  1350. menu "Userspace binary formats"
  1351. source "fs/Kconfig.binfmt"
  1352. config ARTHUR
  1353. tristate "RISC OS personality"
  1354. depends on !AEABI
  1355. help
  1356. Say Y here to include the kernel code necessary if you want to run
  1357. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1358. experimental; if this sounds frightening, say N and sleep in peace.
  1359. You can also say M here to compile this support as a module (which
  1360. will be called arthur).
  1361. endmenu
  1362. menu "Power management options"
  1363. source "kernel/power/Kconfig"
  1364. config ARCH_SUSPEND_POSSIBLE
  1365. def_bool y
  1366. endmenu
  1367. source "net/Kconfig"
  1368. source "drivers/Kconfig"
  1369. source "fs/Kconfig"
  1370. source "arch/arm/Kconfig.debug"
  1371. source "security/Kconfig"
  1372. source "crypto/Kconfig"
  1373. source "lib/Kconfig"