Kconfig 58 KB

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  1. config ARM
  2. bool
  3. default y
  4. select HAVE_AOUT
  5. select HAVE_DMA_API_DEBUG
  6. select HAVE_IDE
  7. select HAVE_MEMBLOCK
  8. select RTC_LIB
  9. select SYS_SUPPORTS_APM_EMULATION
  10. select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
  11. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  12. select HAVE_ARCH_KGDB
  13. select HAVE_KPROBES if (!XIP_KERNEL && !THUMB2_KERNEL)
  14. select HAVE_KRETPROBES if (HAVE_KPROBES)
  15. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  16. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  17. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  18. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  19. select HAVE_GENERIC_DMA_COHERENT
  20. select HAVE_KERNEL_GZIP
  21. select HAVE_KERNEL_LZO
  22. select HAVE_KERNEL_LZMA
  23. select HAVE_IRQ_WORK
  24. select HAVE_PERF_EVENTS
  25. select PERF_USE_VMALLOC
  26. select HAVE_REGS_AND_STACK_ACCESS_API
  27. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  28. select HAVE_C_RECORDMCOUNT
  29. select HAVE_GENERIC_HARDIRQS
  30. select HAVE_SPARSE_IRQ
  31. select GENERIC_IRQ_SHOW
  32. help
  33. The ARM series is a line of low-power-consumption RISC chip designs
  34. licensed by ARM Ltd and targeted at embedded applications and
  35. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  36. manufactured, but legacy ARM-based PC hardware remains popular in
  37. Europe. There is an ARM Linux project with a web page at
  38. <http://www.arm.linux.org.uk/>.
  39. config HAVE_PWM
  40. bool
  41. config MIGHT_HAVE_PCI
  42. bool
  43. config SYS_SUPPORTS_APM_EMULATION
  44. bool
  45. config HAVE_SCHED_CLOCK
  46. bool
  47. config GENERIC_GPIO
  48. bool
  49. config ARCH_USES_GETTIMEOFFSET
  50. bool
  51. default n
  52. config GENERIC_CLOCKEVENTS
  53. bool
  54. config GENERIC_CLOCKEVENTS_BROADCAST
  55. bool
  56. depends on GENERIC_CLOCKEVENTS
  57. default y if SMP
  58. config KTIME_SCALAR
  59. bool
  60. default y
  61. config HAVE_TCM
  62. bool
  63. select GENERIC_ALLOCATOR
  64. config HAVE_PROC_CPU
  65. bool
  66. config NO_IOPORT
  67. bool
  68. config EISA
  69. bool
  70. ---help---
  71. The Extended Industry Standard Architecture (EISA) bus was
  72. developed as an open alternative to the IBM MicroChannel bus.
  73. The EISA bus provided some of the features of the IBM MicroChannel
  74. bus while maintaining backward compatibility with cards made for
  75. the older ISA bus. The EISA bus saw limited use between 1988 and
  76. 1995 when it was made obsolete by the PCI bus.
  77. Say Y here if you are building a kernel for an EISA-based machine.
  78. Otherwise, say N.
  79. config SBUS
  80. bool
  81. config MCA
  82. bool
  83. help
  84. MicroChannel Architecture is found in some IBM PS/2 machines and
  85. laptops. It is a bus system similar to PCI or ISA. See
  86. <file:Documentation/mca.txt> (and especially the web page given
  87. there) before attempting to build an MCA bus kernel.
  88. config STACKTRACE_SUPPORT
  89. bool
  90. default y
  91. config HAVE_LATENCYTOP_SUPPORT
  92. bool
  93. depends on !SMP
  94. default y
  95. config LOCKDEP_SUPPORT
  96. bool
  97. default y
  98. config TRACE_IRQFLAGS_SUPPORT
  99. bool
  100. default y
  101. config HARDIRQS_SW_RESEND
  102. bool
  103. default y
  104. config GENERIC_IRQ_PROBE
  105. bool
  106. default y
  107. config GENERIC_LOCKBREAK
  108. bool
  109. default y
  110. depends on SMP && PREEMPT
  111. config RWSEM_GENERIC_SPINLOCK
  112. bool
  113. default y
  114. config RWSEM_XCHGADD_ALGORITHM
  115. bool
  116. config ARCH_HAS_ILOG2_U32
  117. bool
  118. config ARCH_HAS_ILOG2_U64
  119. bool
  120. config ARCH_HAS_CPUFREQ
  121. bool
  122. help
  123. Internal node to signify that the ARCH has CPUFREQ support
  124. and that the relevant menu configurations are displayed for
  125. it.
  126. config ARCH_HAS_CPU_IDLE_WAIT
  127. def_bool y
  128. config GENERIC_HWEIGHT
  129. bool
  130. default y
  131. config GENERIC_CALIBRATE_DELAY
  132. bool
  133. default y
  134. config ARCH_MAY_HAVE_PC_FDC
  135. bool
  136. config ZONE_DMA
  137. bool
  138. config NEED_DMA_MAP_STATE
  139. def_bool y
  140. config GENERIC_ISA_DMA
  141. bool
  142. config FIQ
  143. bool
  144. config ARCH_MTD_XIP
  145. bool
  146. config VECTORS_BASE
  147. hex
  148. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  149. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  150. default 0x00000000
  151. help
  152. The base address of exception vectors.
  153. config ARM_PATCH_PHYS_VIRT
  154. bool "Patch physical to virtual translations at runtime (EXPERIMENTAL)"
  155. depends on EXPERIMENTAL
  156. depends on !XIP_KERNEL && MMU
  157. depends on !ARCH_REALVIEW || !SPARSEMEM
  158. help
  159. Patch phys-to-virt and virt-to-phys translation functions at
  160. boot and module load time according to the position of the
  161. kernel in system memory.
  162. This can only be used with non-XIP MMU kernels where the base
  163. of physical memory is at a 16MB boundary, or theoretically 64K
  164. for the MSM machine class.
  165. config ARM_PATCH_PHYS_VIRT_16BIT
  166. def_bool y
  167. depends on ARM_PATCH_PHYS_VIRT && ARCH_MSM
  168. help
  169. This option extends the physical to virtual translation patching
  170. to allow physical memory down to a theoretical minimum of 64K
  171. boundaries.
  172. source "init/Kconfig"
  173. source "kernel/Kconfig.freezer"
  174. menu "System Type"
  175. config MMU
  176. bool "MMU-based Paged Memory Management Support"
  177. default y
  178. help
  179. Select if you want MMU-based virtualised addressing space
  180. support by paged memory management. If unsure, say 'Y'.
  181. #
  182. # The "ARM system type" choice list is ordered alphabetically by option
  183. # text. Please add new entries in the option alphabetic order.
  184. #
  185. choice
  186. prompt "ARM system type"
  187. default ARCH_VERSATILE
  188. config ARCH_INTEGRATOR
  189. bool "ARM Ltd. Integrator family"
  190. select ARM_AMBA
  191. select ARCH_HAS_CPUFREQ
  192. select CLKDEV_LOOKUP
  193. select HAVE_MACH_CLKDEV
  194. select ICST
  195. select GENERIC_CLOCKEVENTS
  196. select PLAT_VERSATILE
  197. select PLAT_VERSATILE_FPGA_IRQ
  198. help
  199. Support for ARM's Integrator platform.
  200. config ARCH_REALVIEW
  201. bool "ARM Ltd. RealView family"
  202. select ARM_AMBA
  203. select CLKDEV_LOOKUP
  204. select HAVE_MACH_CLKDEV
  205. select ICST
  206. select GENERIC_CLOCKEVENTS
  207. select ARCH_WANT_OPTIONAL_GPIOLIB
  208. select PLAT_VERSATILE
  209. select PLAT_VERSATILE_CLCD
  210. select ARM_TIMER_SP804
  211. select GPIO_PL061 if GPIOLIB
  212. help
  213. This enables support for ARM Ltd RealView boards.
  214. config ARCH_VERSATILE
  215. bool "ARM Ltd. Versatile family"
  216. select ARM_AMBA
  217. select ARM_VIC
  218. select CLKDEV_LOOKUP
  219. select HAVE_MACH_CLKDEV
  220. select ICST
  221. select GENERIC_CLOCKEVENTS
  222. select ARCH_WANT_OPTIONAL_GPIOLIB
  223. select PLAT_VERSATILE
  224. select PLAT_VERSATILE_CLCD
  225. select PLAT_VERSATILE_FPGA_IRQ
  226. select ARM_TIMER_SP804
  227. help
  228. This enables support for ARM Ltd Versatile board.
  229. config ARCH_VEXPRESS
  230. bool "ARM Ltd. Versatile Express family"
  231. select ARCH_WANT_OPTIONAL_GPIOLIB
  232. select ARM_AMBA
  233. select ARM_TIMER_SP804
  234. select CLKDEV_LOOKUP
  235. select HAVE_MACH_CLKDEV
  236. select GENERIC_CLOCKEVENTS
  237. select HAVE_CLK
  238. select HAVE_PATA_PLATFORM
  239. select ICST
  240. select PLAT_VERSATILE
  241. select PLAT_VERSATILE_CLCD
  242. help
  243. This enables support for the ARM Ltd Versatile Express boards.
  244. config ARCH_AT91
  245. bool "Atmel AT91"
  246. select ARCH_REQUIRE_GPIOLIB
  247. select HAVE_CLK
  248. select CLKDEV_LOOKUP
  249. select ARM_PATCH_PHYS_VIRT if MMU
  250. help
  251. This enables support for systems based on the Atmel AT91RM9200,
  252. AT91SAM9 and AT91CAP9 processors.
  253. config ARCH_BCMRING
  254. bool "Broadcom BCMRING"
  255. depends on MMU
  256. select CPU_V6
  257. select ARM_AMBA
  258. select ARM_TIMER_SP804
  259. select CLKDEV_LOOKUP
  260. select GENERIC_CLOCKEVENTS
  261. select ARCH_WANT_OPTIONAL_GPIOLIB
  262. help
  263. Support for Broadcom's BCMRing platform.
  264. config ARCH_CLPS711X
  265. bool "Cirrus Logic CLPS711x/EP721x-based"
  266. select CPU_ARM720T
  267. select ARCH_USES_GETTIMEOFFSET
  268. help
  269. Support for Cirrus Logic 711x/721x based boards.
  270. config ARCH_CNS3XXX
  271. bool "Cavium Networks CNS3XXX family"
  272. select CPU_V6
  273. select GENERIC_CLOCKEVENTS
  274. select ARM_GIC
  275. select MIGHT_HAVE_PCI
  276. select PCI_DOMAINS if PCI
  277. help
  278. Support for Cavium Networks CNS3XXX platform.
  279. config ARCH_GEMINI
  280. bool "Cortina Systems Gemini"
  281. select CPU_FA526
  282. select ARCH_REQUIRE_GPIOLIB
  283. select ARCH_USES_GETTIMEOFFSET
  284. help
  285. Support for the Cortina Systems Gemini family SoCs
  286. config ARCH_EBSA110
  287. bool "EBSA-110"
  288. select CPU_SA110
  289. select ISA
  290. select NO_IOPORT
  291. select ARCH_USES_GETTIMEOFFSET
  292. help
  293. This is an evaluation board for the StrongARM processor available
  294. from Digital. It has limited hardware on-board, including an
  295. Ethernet interface, two PCMCIA sockets, two serial ports and a
  296. parallel port.
  297. config ARCH_EP93XX
  298. bool "EP93xx-based"
  299. select CPU_ARM920T
  300. select ARM_AMBA
  301. select ARM_VIC
  302. select CLKDEV_LOOKUP
  303. select ARCH_REQUIRE_GPIOLIB
  304. select ARCH_HAS_HOLES_MEMORYMODEL
  305. select ARCH_USES_GETTIMEOFFSET
  306. help
  307. This enables support for the Cirrus EP93xx series of CPUs.
  308. config ARCH_FOOTBRIDGE
  309. bool "FootBridge"
  310. select CPU_SA110
  311. select FOOTBRIDGE
  312. select GENERIC_CLOCKEVENTS
  313. help
  314. Support for systems based on the DC21285 companion chip
  315. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  316. config ARCH_MXC
  317. bool "Freescale MXC/iMX-based"
  318. select GENERIC_CLOCKEVENTS
  319. select ARCH_REQUIRE_GPIOLIB
  320. select CLKDEV_LOOKUP
  321. select CLKSRC_MMIO
  322. select HAVE_SCHED_CLOCK
  323. help
  324. Support for Freescale MXC/iMX-based family of processors
  325. config ARCH_MXS
  326. bool "Freescale MXS-based"
  327. select GENERIC_CLOCKEVENTS
  328. select ARCH_REQUIRE_GPIOLIB
  329. select CLKDEV_LOOKUP
  330. select CLKSRC_MMIO
  331. help
  332. Support for Freescale MXS-based family of processors
  333. config ARCH_NETX
  334. bool "Hilscher NetX based"
  335. select CLKSRC_MMIO
  336. select CPU_ARM926T
  337. select ARM_VIC
  338. select GENERIC_CLOCKEVENTS
  339. help
  340. This enables support for systems based on the Hilscher NetX Soc
  341. config ARCH_H720X
  342. bool "Hynix HMS720x-based"
  343. select CPU_ARM720T
  344. select ISA_DMA_API
  345. select ARCH_USES_GETTIMEOFFSET
  346. help
  347. This enables support for systems based on the Hynix HMS720x
  348. config ARCH_IOP13XX
  349. bool "IOP13xx-based"
  350. depends on MMU
  351. select CPU_XSC3
  352. select PLAT_IOP
  353. select PCI
  354. select ARCH_SUPPORTS_MSI
  355. select VMSPLIT_1G
  356. help
  357. Support for Intel's IOP13XX (XScale) family of processors.
  358. config ARCH_IOP32X
  359. bool "IOP32x-based"
  360. depends on MMU
  361. select CPU_XSCALE
  362. select PLAT_IOP
  363. select PCI
  364. select ARCH_REQUIRE_GPIOLIB
  365. help
  366. Support for Intel's 80219 and IOP32X (XScale) family of
  367. processors.
  368. config ARCH_IOP33X
  369. bool "IOP33x-based"
  370. depends on MMU
  371. select CPU_XSCALE
  372. select PLAT_IOP
  373. select PCI
  374. select ARCH_REQUIRE_GPIOLIB
  375. help
  376. Support for Intel's IOP33X (XScale) family of processors.
  377. config ARCH_IXP23XX
  378. bool "IXP23XX-based"
  379. depends on MMU
  380. select CPU_XSC3
  381. select PCI
  382. select ARCH_USES_GETTIMEOFFSET
  383. help
  384. Support for Intel's IXP23xx (XScale) family of processors.
  385. config ARCH_IXP2000
  386. bool "IXP2400/2800-based"
  387. depends on MMU
  388. select CPU_XSCALE
  389. select PCI
  390. select ARCH_USES_GETTIMEOFFSET
  391. help
  392. Support for Intel's IXP2400/2800 (XScale) family of processors.
  393. config ARCH_IXP4XX
  394. bool "IXP4xx-based"
  395. depends on MMU
  396. select CLKSRC_MMIO
  397. select CPU_XSCALE
  398. select GENERIC_GPIO
  399. select GENERIC_CLOCKEVENTS
  400. select HAVE_SCHED_CLOCK
  401. select MIGHT_HAVE_PCI
  402. select DMABOUNCE if PCI
  403. help
  404. Support for Intel's IXP4XX (XScale) family of processors.
  405. config ARCH_DOVE
  406. bool "Marvell Dove"
  407. select CPU_V7
  408. select PCI
  409. select ARCH_REQUIRE_GPIOLIB
  410. select GENERIC_CLOCKEVENTS
  411. select PLAT_ORION
  412. help
  413. Support for the Marvell Dove SoC 88AP510
  414. config ARCH_KIRKWOOD
  415. bool "Marvell Kirkwood"
  416. select CPU_FEROCEON
  417. select PCI
  418. select ARCH_REQUIRE_GPIOLIB
  419. select GENERIC_CLOCKEVENTS
  420. select PLAT_ORION
  421. help
  422. Support for the following Marvell Kirkwood series SoCs:
  423. 88F6180, 88F6192 and 88F6281.
  424. config ARCH_LOKI
  425. bool "Marvell Loki (88RC8480)"
  426. select CPU_FEROCEON
  427. select GENERIC_CLOCKEVENTS
  428. select PLAT_ORION
  429. help
  430. Support for the Marvell Loki (88RC8480) SoC.
  431. config ARCH_LPC32XX
  432. bool "NXP LPC32XX"
  433. select CLKSRC_MMIO
  434. select CPU_ARM926T
  435. select ARCH_REQUIRE_GPIOLIB
  436. select HAVE_IDE
  437. select ARM_AMBA
  438. select USB_ARCH_HAS_OHCI
  439. select CLKDEV_LOOKUP
  440. select GENERIC_TIME
  441. select GENERIC_CLOCKEVENTS
  442. help
  443. Support for the NXP LPC32XX family of processors
  444. config ARCH_MV78XX0
  445. bool "Marvell MV78xx0"
  446. select CPU_FEROCEON
  447. select PCI
  448. select ARCH_REQUIRE_GPIOLIB
  449. select GENERIC_CLOCKEVENTS
  450. select PLAT_ORION
  451. help
  452. Support for the following Marvell MV78xx0 series SoCs:
  453. MV781x0, MV782x0.
  454. config ARCH_ORION5X
  455. bool "Marvell Orion"
  456. depends on MMU
  457. select CPU_FEROCEON
  458. select PCI
  459. select ARCH_REQUIRE_GPIOLIB
  460. select GENERIC_CLOCKEVENTS
  461. select PLAT_ORION
  462. help
  463. Support for the following Marvell Orion 5x series SoCs:
  464. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  465. Orion-2 (5281), Orion-1-90 (6183).
  466. config ARCH_MMP
  467. bool "Marvell PXA168/910/MMP2"
  468. depends on MMU
  469. select ARCH_REQUIRE_GPIOLIB
  470. select CLKDEV_LOOKUP
  471. select GENERIC_CLOCKEVENTS
  472. select HAVE_SCHED_CLOCK
  473. select TICK_ONESHOT
  474. select PLAT_PXA
  475. select SPARSE_IRQ
  476. help
  477. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  478. config ARCH_KS8695
  479. bool "Micrel/Kendin KS8695"
  480. select CPU_ARM922T
  481. select ARCH_REQUIRE_GPIOLIB
  482. select ARCH_USES_GETTIMEOFFSET
  483. help
  484. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  485. System-on-Chip devices.
  486. config ARCH_W90X900
  487. bool "Nuvoton W90X900 CPU"
  488. select CPU_ARM926T
  489. select ARCH_REQUIRE_GPIOLIB
  490. select CLKDEV_LOOKUP
  491. select CLKSRC_MMIO
  492. select GENERIC_CLOCKEVENTS
  493. help
  494. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  495. At present, the w90x900 has been renamed nuc900, regarding
  496. the ARM series product line, you can login the following
  497. link address to know more.
  498. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  499. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  500. config ARCH_NUC93X
  501. bool "Nuvoton NUC93X CPU"
  502. select CPU_ARM926T
  503. select CLKDEV_LOOKUP
  504. help
  505. Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
  506. low-power and high performance MPEG-4/JPEG multimedia controller chip.
  507. config ARCH_TEGRA
  508. bool "NVIDIA Tegra"
  509. select CLKDEV_LOOKUP
  510. select CLKSRC_MMIO
  511. select GENERIC_TIME
  512. select GENERIC_CLOCKEVENTS
  513. select GENERIC_GPIO
  514. select HAVE_CLK
  515. select HAVE_SCHED_CLOCK
  516. select ARCH_HAS_BARRIERS if CACHE_L2X0
  517. select ARCH_HAS_CPUFREQ
  518. help
  519. This enables support for NVIDIA Tegra based systems (Tegra APX,
  520. Tegra 6xx and Tegra 2 series).
  521. config ARCH_PNX4008
  522. bool "Philips Nexperia PNX4008 Mobile"
  523. select CPU_ARM926T
  524. select CLKDEV_LOOKUP
  525. select ARCH_USES_GETTIMEOFFSET
  526. help
  527. This enables support for Philips PNX4008 mobile platform.
  528. config ARCH_PXA
  529. bool "PXA2xx/PXA3xx-based"
  530. depends on MMU
  531. select ARCH_MTD_XIP
  532. select ARCH_HAS_CPUFREQ
  533. select CLKDEV_LOOKUP
  534. select CLKSRC_MMIO
  535. select ARCH_REQUIRE_GPIOLIB
  536. select GENERIC_CLOCKEVENTS
  537. select HAVE_SCHED_CLOCK
  538. select TICK_ONESHOT
  539. select PLAT_PXA
  540. select SPARSE_IRQ
  541. help
  542. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  543. config ARCH_MSM
  544. bool "Qualcomm MSM"
  545. select HAVE_CLK
  546. select GENERIC_CLOCKEVENTS
  547. select ARCH_REQUIRE_GPIOLIB
  548. select CLKDEV_LOOKUP
  549. help
  550. Support for Qualcomm MSM/QSD based systems. This runs on the
  551. apps processor of the MSM/QSD and depends on a shared memory
  552. interface to the modem processor which runs the baseband
  553. stack and controls some vital subsystems
  554. (clock and power control, etc).
  555. config ARCH_SHMOBILE
  556. bool "Renesas SH-Mobile / R-Mobile"
  557. select HAVE_CLK
  558. select CLKDEV_LOOKUP
  559. select HAVE_MACH_CLKDEV
  560. select GENERIC_CLOCKEVENTS
  561. select NO_IOPORT
  562. select SPARSE_IRQ
  563. select MULTI_IRQ_HANDLER
  564. help
  565. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  566. config ARCH_RPC
  567. bool "RiscPC"
  568. select ARCH_ACORN
  569. select FIQ
  570. select TIMER_ACORN
  571. select ARCH_MAY_HAVE_PC_FDC
  572. select HAVE_PATA_PLATFORM
  573. select ISA_DMA_API
  574. select NO_IOPORT
  575. select ARCH_SPARSEMEM_ENABLE
  576. select ARCH_USES_GETTIMEOFFSET
  577. help
  578. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  579. CD-ROM interface, serial and parallel port, and the floppy drive.
  580. config ARCH_SA1100
  581. bool "SA1100-based"
  582. select CLKSRC_MMIO
  583. select CPU_SA1100
  584. select ISA
  585. select ARCH_SPARSEMEM_ENABLE
  586. select ARCH_MTD_XIP
  587. select ARCH_HAS_CPUFREQ
  588. select CPU_FREQ
  589. select GENERIC_CLOCKEVENTS
  590. select HAVE_CLK
  591. select HAVE_SCHED_CLOCK
  592. select TICK_ONESHOT
  593. select ARCH_REQUIRE_GPIOLIB
  594. help
  595. Support for StrongARM 11x0 based boards.
  596. config ARCH_S3C2410
  597. bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
  598. select GENERIC_GPIO
  599. select ARCH_HAS_CPUFREQ
  600. select HAVE_CLK
  601. select ARCH_USES_GETTIMEOFFSET
  602. select HAVE_S3C2410_I2C if I2C
  603. help
  604. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  605. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  606. the Samsung SMDK2410 development board (and derivatives).
  607. Note, the S3C2416 and the S3C2450 are so close that they even share
  608. the same SoC ID code. This means that there is no separate machine
  609. directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
  610. config ARCH_S3C64XX
  611. bool "Samsung S3C64XX"
  612. select PLAT_SAMSUNG
  613. select CPU_V6
  614. select ARM_VIC
  615. select HAVE_CLK
  616. select NO_IOPORT
  617. select ARCH_USES_GETTIMEOFFSET
  618. select ARCH_HAS_CPUFREQ
  619. select ARCH_REQUIRE_GPIOLIB
  620. select SAMSUNG_CLKSRC
  621. select SAMSUNG_IRQ_VIC_TIMER
  622. select SAMSUNG_IRQ_UART
  623. select S3C_GPIO_TRACK
  624. select S3C_GPIO_PULL_UPDOWN
  625. select S3C_GPIO_CFG_S3C24XX
  626. select S3C_GPIO_CFG_S3C64XX
  627. select S3C_DEV_NAND
  628. select USB_ARCH_HAS_OHCI
  629. select SAMSUNG_GPIOLIB_4BIT
  630. select HAVE_S3C2410_I2C if I2C
  631. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  632. help
  633. Samsung S3C64XX series based systems
  634. config ARCH_S5P64X0
  635. bool "Samsung S5P6440 S5P6450"
  636. select CPU_V6
  637. select GENERIC_GPIO
  638. select HAVE_CLK
  639. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  640. select GENERIC_CLOCKEVENTS
  641. select HAVE_SCHED_CLOCK
  642. select HAVE_S3C2410_I2C if I2C
  643. select HAVE_S3C_RTC if RTC_CLASS
  644. help
  645. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  646. SMDK6450.
  647. config ARCH_S5PC100
  648. bool "Samsung S5PC100"
  649. select GENERIC_GPIO
  650. select HAVE_CLK
  651. select CPU_V7
  652. select ARM_L1_CACHE_SHIFT_6
  653. select ARCH_USES_GETTIMEOFFSET
  654. select HAVE_S3C2410_I2C if I2C
  655. select HAVE_S3C_RTC if RTC_CLASS
  656. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  657. help
  658. Samsung S5PC100 series based systems
  659. config ARCH_S5PV210
  660. bool "Samsung S5PV210/S5PC110"
  661. select CPU_V7
  662. select ARCH_SPARSEMEM_ENABLE
  663. select GENERIC_GPIO
  664. select HAVE_CLK
  665. select ARM_L1_CACHE_SHIFT_6
  666. select ARCH_HAS_CPUFREQ
  667. select GENERIC_CLOCKEVENTS
  668. select HAVE_SCHED_CLOCK
  669. select HAVE_S3C2410_I2C if I2C
  670. select HAVE_S3C_RTC if RTC_CLASS
  671. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  672. help
  673. Samsung S5PV210/S5PC110 series based systems
  674. config ARCH_EXYNOS4
  675. bool "Samsung EXYNOS4"
  676. select CPU_V7
  677. select ARCH_SPARSEMEM_ENABLE
  678. select GENERIC_GPIO
  679. select HAVE_CLK
  680. select ARCH_HAS_CPUFREQ
  681. select GENERIC_CLOCKEVENTS
  682. select HAVE_S3C_RTC if RTC_CLASS
  683. select HAVE_S3C2410_I2C if I2C
  684. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  685. help
  686. Samsung EXYNOS4 series based systems
  687. config ARCH_SHARK
  688. bool "Shark"
  689. select CPU_SA110
  690. select ISA
  691. select ISA_DMA
  692. select ZONE_DMA
  693. select PCI
  694. select ARCH_USES_GETTIMEOFFSET
  695. help
  696. Support for the StrongARM based Digital DNARD machine, also known
  697. as "Shark" (<http://www.shark-linux.de/shark.html>).
  698. config ARCH_TCC_926
  699. bool "Telechips TCC ARM926-based systems"
  700. select CLKSRC_MMIO
  701. select CPU_ARM926T
  702. select HAVE_CLK
  703. select CLKDEV_LOOKUP
  704. select GENERIC_CLOCKEVENTS
  705. help
  706. Support for Telechips TCC ARM926-based systems.
  707. config ARCH_U300
  708. bool "ST-Ericsson U300 Series"
  709. depends on MMU
  710. select CLKSRC_MMIO
  711. select CPU_ARM926T
  712. select HAVE_SCHED_CLOCK
  713. select HAVE_TCM
  714. select ARM_AMBA
  715. select ARM_VIC
  716. select GENERIC_CLOCKEVENTS
  717. select CLKDEV_LOOKUP
  718. select HAVE_MACH_CLKDEV
  719. select GENERIC_GPIO
  720. help
  721. Support for ST-Ericsson U300 series mobile platforms.
  722. config ARCH_U8500
  723. bool "ST-Ericsson U8500 Series"
  724. select CPU_V7
  725. select ARM_AMBA
  726. select GENERIC_CLOCKEVENTS
  727. select CLKDEV_LOOKUP
  728. select ARCH_REQUIRE_GPIOLIB
  729. select ARCH_HAS_CPUFREQ
  730. help
  731. Support for ST-Ericsson's Ux500 architecture
  732. config ARCH_NOMADIK
  733. bool "STMicroelectronics Nomadik"
  734. select ARM_AMBA
  735. select ARM_VIC
  736. select CPU_ARM926T
  737. select CLKDEV_LOOKUP
  738. select GENERIC_CLOCKEVENTS
  739. select ARCH_REQUIRE_GPIOLIB
  740. help
  741. Support for the Nomadik platform by ST-Ericsson
  742. config ARCH_DAVINCI
  743. bool "TI DaVinci"
  744. select GENERIC_CLOCKEVENTS
  745. select ARCH_REQUIRE_GPIOLIB
  746. select ZONE_DMA
  747. select HAVE_IDE
  748. select CLKDEV_LOOKUP
  749. select GENERIC_ALLOCATOR
  750. select GENERIC_IRQ_CHIP
  751. select ARCH_HAS_HOLES_MEMORYMODEL
  752. help
  753. Support for TI's DaVinci platform.
  754. config ARCH_OMAP
  755. bool "TI OMAP"
  756. select HAVE_CLK
  757. select ARCH_REQUIRE_GPIOLIB
  758. select ARCH_HAS_CPUFREQ
  759. select GENERIC_CLOCKEVENTS
  760. select HAVE_SCHED_CLOCK
  761. select ARCH_HAS_HOLES_MEMORYMODEL
  762. help
  763. Support for TI's OMAP platform (OMAP1/2/3/4).
  764. config PLAT_SPEAR
  765. bool "ST SPEAr"
  766. select ARM_AMBA
  767. select ARCH_REQUIRE_GPIOLIB
  768. select CLKDEV_LOOKUP
  769. select CLKSRC_MMIO
  770. select GENERIC_CLOCKEVENTS
  771. select HAVE_CLK
  772. help
  773. Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
  774. config ARCH_VT8500
  775. bool "VIA/WonderMedia 85xx"
  776. select CPU_ARM926T
  777. select GENERIC_GPIO
  778. select ARCH_HAS_CPUFREQ
  779. select GENERIC_CLOCKEVENTS
  780. select ARCH_REQUIRE_GPIOLIB
  781. select HAVE_PWM
  782. help
  783. Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
  784. endchoice
  785. #
  786. # This is sorted alphabetically by mach-* pathname. However, plat-*
  787. # Kconfigs may be included either alphabetically (according to the
  788. # plat- suffix) or along side the corresponding mach-* source.
  789. #
  790. source "arch/arm/mach-at91/Kconfig"
  791. source "arch/arm/mach-bcmring/Kconfig"
  792. source "arch/arm/mach-clps711x/Kconfig"
  793. source "arch/arm/mach-cns3xxx/Kconfig"
  794. source "arch/arm/mach-davinci/Kconfig"
  795. source "arch/arm/mach-dove/Kconfig"
  796. source "arch/arm/mach-ep93xx/Kconfig"
  797. source "arch/arm/mach-footbridge/Kconfig"
  798. source "arch/arm/mach-gemini/Kconfig"
  799. source "arch/arm/mach-h720x/Kconfig"
  800. source "arch/arm/mach-integrator/Kconfig"
  801. source "arch/arm/mach-iop32x/Kconfig"
  802. source "arch/arm/mach-iop33x/Kconfig"
  803. source "arch/arm/mach-iop13xx/Kconfig"
  804. source "arch/arm/mach-ixp4xx/Kconfig"
  805. source "arch/arm/mach-ixp2000/Kconfig"
  806. source "arch/arm/mach-ixp23xx/Kconfig"
  807. source "arch/arm/mach-kirkwood/Kconfig"
  808. source "arch/arm/mach-ks8695/Kconfig"
  809. source "arch/arm/mach-loki/Kconfig"
  810. source "arch/arm/mach-lpc32xx/Kconfig"
  811. source "arch/arm/mach-msm/Kconfig"
  812. source "arch/arm/mach-mv78xx0/Kconfig"
  813. source "arch/arm/plat-mxc/Kconfig"
  814. source "arch/arm/mach-mxs/Kconfig"
  815. source "arch/arm/mach-netx/Kconfig"
  816. source "arch/arm/mach-nomadik/Kconfig"
  817. source "arch/arm/plat-nomadik/Kconfig"
  818. source "arch/arm/mach-nuc93x/Kconfig"
  819. source "arch/arm/plat-omap/Kconfig"
  820. source "arch/arm/mach-omap1/Kconfig"
  821. source "arch/arm/mach-omap2/Kconfig"
  822. source "arch/arm/mach-orion5x/Kconfig"
  823. source "arch/arm/mach-pxa/Kconfig"
  824. source "arch/arm/plat-pxa/Kconfig"
  825. source "arch/arm/mach-mmp/Kconfig"
  826. source "arch/arm/mach-realview/Kconfig"
  827. source "arch/arm/mach-sa1100/Kconfig"
  828. source "arch/arm/plat-samsung/Kconfig"
  829. source "arch/arm/plat-s3c24xx/Kconfig"
  830. source "arch/arm/plat-s5p/Kconfig"
  831. source "arch/arm/plat-spear/Kconfig"
  832. source "arch/arm/plat-tcc/Kconfig"
  833. if ARCH_S3C2410
  834. source "arch/arm/mach-s3c2400/Kconfig"
  835. source "arch/arm/mach-s3c2410/Kconfig"
  836. source "arch/arm/mach-s3c2412/Kconfig"
  837. source "arch/arm/mach-s3c2416/Kconfig"
  838. source "arch/arm/mach-s3c2440/Kconfig"
  839. source "arch/arm/mach-s3c2443/Kconfig"
  840. endif
  841. if ARCH_S3C64XX
  842. source "arch/arm/mach-s3c64xx/Kconfig"
  843. endif
  844. source "arch/arm/mach-s5p64x0/Kconfig"
  845. source "arch/arm/mach-s5pc100/Kconfig"
  846. source "arch/arm/mach-s5pv210/Kconfig"
  847. source "arch/arm/mach-exynos4/Kconfig"
  848. source "arch/arm/mach-shmobile/Kconfig"
  849. source "arch/arm/mach-tegra/Kconfig"
  850. source "arch/arm/mach-u300/Kconfig"
  851. source "arch/arm/mach-ux500/Kconfig"
  852. source "arch/arm/mach-versatile/Kconfig"
  853. source "arch/arm/mach-vexpress/Kconfig"
  854. source "arch/arm/plat-versatile/Kconfig"
  855. source "arch/arm/mach-vt8500/Kconfig"
  856. source "arch/arm/mach-w90x900/Kconfig"
  857. # Definitions to make life easier
  858. config ARCH_ACORN
  859. bool
  860. config PLAT_IOP
  861. bool
  862. select GENERIC_CLOCKEVENTS
  863. select HAVE_SCHED_CLOCK
  864. config PLAT_ORION
  865. bool
  866. select CLKSRC_MMIO
  867. select GENERIC_IRQ_CHIP
  868. select HAVE_SCHED_CLOCK
  869. config PLAT_PXA
  870. bool
  871. config PLAT_VERSATILE
  872. bool
  873. config ARM_TIMER_SP804
  874. bool
  875. select CLKSRC_MMIO
  876. source arch/arm/mm/Kconfig
  877. config IWMMXT
  878. bool "Enable iWMMXt support"
  879. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  880. default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
  881. help
  882. Enable support for iWMMXt context switching at run time if
  883. running on a CPU that supports it.
  884. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  885. config XSCALE_PMU
  886. bool
  887. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  888. default y
  889. config CPU_HAS_PMU
  890. depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
  891. (!ARCH_OMAP3 || OMAP3_EMU)
  892. default y
  893. bool
  894. config MULTI_IRQ_HANDLER
  895. bool
  896. help
  897. Allow each machine to specify it's own IRQ handler at run time.
  898. if !MMU
  899. source "arch/arm/Kconfig-nommu"
  900. endif
  901. config ARM_ERRATA_411920
  902. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  903. depends on CPU_V6 || CPU_V6K
  904. help
  905. Invalidation of the Instruction Cache operation can
  906. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  907. It does not affect the MPCore. This option enables the ARM Ltd.
  908. recommended workaround.
  909. config ARM_ERRATA_430973
  910. bool "ARM errata: Stale prediction on replaced interworking branch"
  911. depends on CPU_V7
  912. help
  913. This option enables the workaround for the 430973 Cortex-A8
  914. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  915. interworking branch is replaced with another code sequence at the
  916. same virtual address, whether due to self-modifying code or virtual
  917. to physical address re-mapping, Cortex-A8 does not recover from the
  918. stale interworking branch prediction. This results in Cortex-A8
  919. executing the new code sequence in the incorrect ARM or Thumb state.
  920. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  921. and also flushes the branch target cache at every context switch.
  922. Note that setting specific bits in the ACTLR register may not be
  923. available in non-secure mode.
  924. config ARM_ERRATA_458693
  925. bool "ARM errata: Processor deadlock when a false hazard is created"
  926. depends on CPU_V7
  927. help
  928. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  929. erratum. For very specific sequences of memory operations, it is
  930. possible for a hazard condition intended for a cache line to instead
  931. be incorrectly associated with a different cache line. This false
  932. hazard might then cause a processor deadlock. The workaround enables
  933. the L1 caching of the NEON accesses and disables the PLD instruction
  934. in the ACTLR register. Note that setting specific bits in the ACTLR
  935. register may not be available in non-secure mode.
  936. config ARM_ERRATA_460075
  937. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  938. depends on CPU_V7
  939. help
  940. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  941. erratum. Any asynchronous access to the L2 cache may encounter a
  942. situation in which recent store transactions to the L2 cache are lost
  943. and overwritten with stale memory contents from external memory. The
  944. workaround disables the write-allocate mode for the L2 cache via the
  945. ACTLR register. Note that setting specific bits in the ACTLR register
  946. may not be available in non-secure mode.
  947. config ARM_ERRATA_742230
  948. bool "ARM errata: DMB operation may be faulty"
  949. depends on CPU_V7 && SMP
  950. help
  951. This option enables the workaround for the 742230 Cortex-A9
  952. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  953. between two write operations may not ensure the correct visibility
  954. ordering of the two writes. This workaround sets a specific bit in
  955. the diagnostic register of the Cortex-A9 which causes the DMB
  956. instruction to behave as a DSB, ensuring the correct behaviour of
  957. the two writes.
  958. config ARM_ERRATA_742231
  959. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  960. depends on CPU_V7 && SMP
  961. help
  962. This option enables the workaround for the 742231 Cortex-A9
  963. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  964. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  965. accessing some data located in the same cache line, may get corrupted
  966. data due to bad handling of the address hazard when the line gets
  967. replaced from one of the CPUs at the same time as another CPU is
  968. accessing it. This workaround sets specific bits in the diagnostic
  969. register of the Cortex-A9 which reduces the linefill issuing
  970. capabilities of the processor.
  971. config PL310_ERRATA_588369
  972. bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
  973. depends on CACHE_L2X0
  974. help
  975. The PL310 L2 cache controller implements three types of Clean &
  976. Invalidate maintenance operations: by Physical Address
  977. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  978. They are architecturally defined to behave as the execution of a
  979. clean operation followed immediately by an invalidate operation,
  980. both performing to the same memory location. This functionality
  981. is not correctly implemented in PL310 as clean lines are not
  982. invalidated as a result of these operations.
  983. config ARM_ERRATA_720789
  984. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  985. depends on CPU_V7 && SMP
  986. help
  987. This option enables the workaround for the 720789 Cortex-A9 (prior to
  988. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  989. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  990. As a consequence of this erratum, some TLB entries which should be
  991. invalidated are not, resulting in an incoherency in the system page
  992. tables. The workaround changes the TLB flushing routines to invalidate
  993. entries regardless of the ASID.
  994. config PL310_ERRATA_727915
  995. bool "Background Clean & Invalidate by Way operation can cause data corruption"
  996. depends on CACHE_L2X0
  997. help
  998. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  999. operation (offset 0x7FC). This operation runs in background so that
  1000. PL310 can handle normal accesses while it is in progress. Under very
  1001. rare circumstances, due to this erratum, write data can be lost when
  1002. PL310 treats a cacheable write transaction during a Clean &
  1003. Invalidate by Way operation.
  1004. config ARM_ERRATA_743622
  1005. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1006. depends on CPU_V7
  1007. help
  1008. This option enables the workaround for the 743622 Cortex-A9
  1009. (r2p0..r2p2) erratum. Under very rare conditions, a faulty
  1010. optimisation in the Cortex-A9 Store Buffer may lead to data
  1011. corruption. This workaround sets a specific bit in the diagnostic
  1012. register of the Cortex-A9 which disables the Store Buffer
  1013. optimisation, preventing the defect from occurring. This has no
  1014. visible impact on the overall performance or power consumption of the
  1015. processor.
  1016. config ARM_ERRATA_751472
  1017. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1018. depends on CPU_V7 && SMP
  1019. help
  1020. This option enables the workaround for the 751472 Cortex-A9 (prior
  1021. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1022. completion of a following broadcasted operation if the second
  1023. operation is received by a CPU before the ICIALLUIS has completed,
  1024. potentially leading to corrupted entries in the cache or TLB.
  1025. config ARM_ERRATA_753970
  1026. bool "ARM errata: cache sync operation may be faulty"
  1027. depends on CACHE_PL310
  1028. help
  1029. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1030. Under some condition the effect of cache sync operation on
  1031. the store buffer still remains when the operation completes.
  1032. This means that the store buffer is always asked to drain and
  1033. this prevents it from merging any further writes. The workaround
  1034. is to replace the normal offset of cache sync operation (0x730)
  1035. by another offset targeting an unmapped PL310 register 0x740.
  1036. This has the same effect as the cache sync operation: store buffer
  1037. drain and waiting for all buffers empty.
  1038. config ARM_ERRATA_754322
  1039. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1040. depends on CPU_V7
  1041. help
  1042. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1043. r3p*) erratum. A speculative memory access may cause a page table walk
  1044. which starts prior to an ASID switch but completes afterwards. This
  1045. can populate the micro-TLB with a stale entry which may be hit with
  1046. the new ASID. This workaround places two dsb instructions in the mm
  1047. switching code so that no page table walks can cross the ASID switch.
  1048. config ARM_ERRATA_754327
  1049. bool "ARM errata: no automatic Store Buffer drain"
  1050. depends on CPU_V7 && SMP
  1051. help
  1052. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1053. r2p0) erratum. The Store Buffer does not have any automatic draining
  1054. mechanism and therefore a livelock may occur if an external agent
  1055. continuously polls a memory location waiting to observe an update.
  1056. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1057. written polling loops from denying visibility of updates to memory.
  1058. endmenu
  1059. source "arch/arm/common/Kconfig"
  1060. menu "Bus support"
  1061. config ARM_AMBA
  1062. bool
  1063. config ISA
  1064. bool
  1065. help
  1066. Find out whether you have ISA slots on your motherboard. ISA is the
  1067. name of a bus system, i.e. the way the CPU talks to the other stuff
  1068. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1069. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1070. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1071. # Select ISA DMA controller support
  1072. config ISA_DMA
  1073. bool
  1074. select ISA_DMA_API
  1075. # Select ISA DMA interface
  1076. config ISA_DMA_API
  1077. bool
  1078. config PCI
  1079. bool "PCI support" if MIGHT_HAVE_PCI
  1080. help
  1081. Find out whether you have a PCI motherboard. PCI is the name of a
  1082. bus system, i.e. the way the CPU talks to the other stuff inside
  1083. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1084. VESA. If you have PCI, say Y, otherwise N.
  1085. config PCI_DOMAINS
  1086. bool
  1087. depends on PCI
  1088. config PCI_NANOENGINE
  1089. bool "BSE nanoEngine PCI support"
  1090. depends on SA1100_NANOENGINE
  1091. help
  1092. Enable PCI on the BSE nanoEngine board.
  1093. config PCI_SYSCALL
  1094. def_bool PCI
  1095. # Select the host bridge type
  1096. config PCI_HOST_VIA82C505
  1097. bool
  1098. depends on PCI && ARCH_SHARK
  1099. default y
  1100. config PCI_HOST_ITE8152
  1101. bool
  1102. depends on PCI && MACH_ARMCORE
  1103. default y
  1104. select DMABOUNCE
  1105. source "drivers/pci/Kconfig"
  1106. source "drivers/pcmcia/Kconfig"
  1107. endmenu
  1108. menu "Kernel Features"
  1109. source "kernel/time/Kconfig"
  1110. config SMP
  1111. bool "Symmetric Multi-Processing"
  1112. depends on CPU_V6K || CPU_V7
  1113. depends on GENERIC_CLOCKEVENTS
  1114. depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
  1115. MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
  1116. ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
  1117. ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE
  1118. select USE_GENERIC_SMP_HELPERS
  1119. select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
  1120. help
  1121. This enables support for systems with more than one CPU. If you have
  1122. a system with only one CPU, like most personal computers, say N. If
  1123. you have a system with more than one CPU, say Y.
  1124. If you say N here, the kernel will run on single and multiprocessor
  1125. machines, but will use only one CPU of a multiprocessor machine. If
  1126. you say Y here, the kernel will run on many, but not all, single
  1127. processor machines. On a single processor machine, the kernel will
  1128. run faster if you say N here.
  1129. See also <file:Documentation/i386/IO-APIC.txt>,
  1130. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1131. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1132. If you don't know what to do here, say N.
  1133. config SMP_ON_UP
  1134. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1135. depends on EXPERIMENTAL
  1136. depends on SMP && !XIP_KERNEL
  1137. default y
  1138. help
  1139. SMP kernels contain instructions which fail on non-SMP processors.
  1140. Enabling this option allows the kernel to modify itself to make
  1141. these instructions safe. Disabling it allows about 1K of space
  1142. savings.
  1143. If you don't know what to do here, say Y.
  1144. config HAVE_ARM_SCU
  1145. bool
  1146. depends on SMP
  1147. help
  1148. This option enables support for the ARM system coherency unit
  1149. config HAVE_ARM_TWD
  1150. bool
  1151. depends on SMP
  1152. select TICK_ONESHOT
  1153. help
  1154. This options enables support for the ARM timer and watchdog unit
  1155. choice
  1156. prompt "Memory split"
  1157. default VMSPLIT_3G
  1158. help
  1159. Select the desired split between kernel and user memory.
  1160. If you are not absolutely sure what you are doing, leave this
  1161. option alone!
  1162. config VMSPLIT_3G
  1163. bool "3G/1G user/kernel split"
  1164. config VMSPLIT_2G
  1165. bool "2G/2G user/kernel split"
  1166. config VMSPLIT_1G
  1167. bool "1G/3G user/kernel split"
  1168. endchoice
  1169. config PAGE_OFFSET
  1170. hex
  1171. default 0x40000000 if VMSPLIT_1G
  1172. default 0x80000000 if VMSPLIT_2G
  1173. default 0xC0000000
  1174. config NR_CPUS
  1175. int "Maximum number of CPUs (2-32)"
  1176. range 2 32
  1177. depends on SMP
  1178. default "4"
  1179. config HOTPLUG_CPU
  1180. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  1181. depends on SMP && HOTPLUG && EXPERIMENTAL
  1182. help
  1183. Say Y here to experiment with turning CPUs off and on. CPUs
  1184. can be controlled through /sys/devices/system/cpu.
  1185. config LOCAL_TIMERS
  1186. bool "Use local timer interrupts"
  1187. depends on SMP
  1188. default y
  1189. select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
  1190. help
  1191. Enable support for local timers on SMP platforms, rather then the
  1192. legacy IPI broadcast method. Local timers allows the system
  1193. accounting to be spread across the timer interval, preventing a
  1194. "thundering herd" at every timer tick.
  1195. source kernel/Kconfig.preempt
  1196. config HZ
  1197. int
  1198. default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
  1199. ARCH_S5PV210 || ARCH_EXYNOS4
  1200. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  1201. default AT91_TIMER_HZ if ARCH_AT91
  1202. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1203. default 100
  1204. config THUMB2_KERNEL
  1205. bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
  1206. depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
  1207. select AEABI
  1208. select ARM_ASM_UNIFIED
  1209. help
  1210. By enabling this option, the kernel will be compiled in
  1211. Thumb-2 mode. A compiler/assembler that understand the unified
  1212. ARM-Thumb syntax is needed.
  1213. If unsure, say N.
  1214. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1215. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1216. depends on THUMB2_KERNEL && MODULES
  1217. default y
  1218. help
  1219. Various binutils versions can resolve Thumb-2 branches to
  1220. locally-defined, preemptible global symbols as short-range "b.n"
  1221. branch instructions.
  1222. This is a problem, because there's no guarantee the final
  1223. destination of the symbol, or any candidate locations for a
  1224. trampoline, are within range of the branch. For this reason, the
  1225. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1226. relocation in modules at all, and it makes little sense to add
  1227. support.
  1228. The symptom is that the kernel fails with an "unsupported
  1229. relocation" error when loading some modules.
  1230. Until fixed tools are available, passing
  1231. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1232. code which hits this problem, at the cost of a bit of extra runtime
  1233. stack usage in some cases.
  1234. The problem is described in more detail at:
  1235. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1236. Only Thumb-2 kernels are affected.
  1237. Unless you are sure your tools don't have this problem, say Y.
  1238. config ARM_ASM_UNIFIED
  1239. bool
  1240. config AEABI
  1241. bool "Use the ARM EABI to compile the kernel"
  1242. help
  1243. This option allows for the kernel to be compiled using the latest
  1244. ARM ABI (aka EABI). This is only useful if you are using a user
  1245. space environment that is also compiled with EABI.
  1246. Since there are major incompatibilities between the legacy ABI and
  1247. EABI, especially with regard to structure member alignment, this
  1248. option also changes the kernel syscall calling convention to
  1249. disambiguate both ABIs and allow for backward compatibility support
  1250. (selected with CONFIG_OABI_COMPAT).
  1251. To use this you need GCC version 4.0.0 or later.
  1252. config OABI_COMPAT
  1253. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1254. depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
  1255. default y
  1256. help
  1257. This option preserves the old syscall interface along with the
  1258. new (ARM EABI) one. It also provides a compatibility layer to
  1259. intercept syscalls that have structure arguments which layout
  1260. in memory differs between the legacy ABI and the new ARM EABI
  1261. (only for non "thumb" binaries). This option adds a tiny
  1262. overhead to all syscalls and produces a slightly larger kernel.
  1263. If you know you'll be using only pure EABI user space then you
  1264. can say N here. If this option is not selected and you attempt
  1265. to execute a legacy ABI binary then the result will be
  1266. UNPREDICTABLE (in fact it can be predicted that it won't work
  1267. at all). If in doubt say Y.
  1268. config ARCH_HAS_HOLES_MEMORYMODEL
  1269. bool
  1270. config ARCH_SPARSEMEM_ENABLE
  1271. bool
  1272. config ARCH_SPARSEMEM_DEFAULT
  1273. def_bool ARCH_SPARSEMEM_ENABLE
  1274. config ARCH_SELECT_MEMORY_MODEL
  1275. def_bool ARCH_SPARSEMEM_ENABLE
  1276. config HAVE_ARCH_PFN_VALID
  1277. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1278. config HIGHMEM
  1279. bool "High Memory Support"
  1280. depends on MMU
  1281. help
  1282. The address space of ARM processors is only 4 Gigabytes large
  1283. and it has to accommodate user address space, kernel address
  1284. space as well as some memory mapped IO. That means that, if you
  1285. have a large amount of physical memory and/or IO, not all of the
  1286. memory can be "permanently mapped" by the kernel. The physical
  1287. memory that is not permanently mapped is called "high memory".
  1288. Depending on the selected kernel/user memory split, minimum
  1289. vmalloc space and actual amount of RAM, you may not need this
  1290. option which should result in a slightly faster kernel.
  1291. If unsure, say n.
  1292. config HIGHPTE
  1293. bool "Allocate 2nd-level pagetables from highmem"
  1294. depends on HIGHMEM
  1295. config HW_PERF_EVENTS
  1296. bool "Enable hardware performance counter support for perf events"
  1297. depends on PERF_EVENTS && CPU_HAS_PMU
  1298. default y
  1299. help
  1300. Enable hardware performance counter support for perf events. If
  1301. disabled, perf events will use software events only.
  1302. source "mm/Kconfig"
  1303. config FORCE_MAX_ZONEORDER
  1304. int "Maximum zone order" if ARCH_SHMOBILE
  1305. range 11 64 if ARCH_SHMOBILE
  1306. default "9" if SA1111
  1307. default "11"
  1308. help
  1309. The kernel memory allocator divides physically contiguous memory
  1310. blocks into "zones", where each zone is a power of two number of
  1311. pages. This option selects the largest power of two that the kernel
  1312. keeps in the memory allocator. If you need to allocate very large
  1313. blocks of physically contiguous memory, then you may need to
  1314. increase this value.
  1315. This config option is actually maximum order plus one. For example,
  1316. a value of 11 means that the largest free memory block is 2^10 pages.
  1317. config LEDS
  1318. bool "Timer and CPU usage LEDs"
  1319. depends on ARCH_CDB89712 || ARCH_EBSA110 || \
  1320. ARCH_EBSA285 || ARCH_INTEGRATOR || \
  1321. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  1322. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  1323. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  1324. ARCH_AT91 || ARCH_DAVINCI || \
  1325. ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
  1326. help
  1327. If you say Y here, the LEDs on your machine will be used
  1328. to provide useful information about your current system status.
  1329. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  1330. be able to select which LEDs are active using the options below. If
  1331. you are compiling a kernel for the EBSA-110 or the LART however, the
  1332. red LED will simply flash regularly to indicate that the system is
  1333. still functional. It is safe to say Y here if you have a CATS
  1334. system, but the driver will do nothing.
  1335. config LEDS_TIMER
  1336. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  1337. OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1338. || MACH_OMAP_PERSEUS2
  1339. depends on LEDS
  1340. depends on !GENERIC_CLOCKEVENTS
  1341. default y if ARCH_EBSA110
  1342. help
  1343. If you say Y here, one of the system LEDs (the green one on the
  1344. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  1345. will flash regularly to indicate that the system is still
  1346. operational. This is mainly useful to kernel hackers who are
  1347. debugging unstable kernels.
  1348. The LART uses the same LED for both Timer LED and CPU usage LED
  1349. functions. You may choose to use both, but the Timer LED function
  1350. will overrule the CPU usage LED.
  1351. config LEDS_CPU
  1352. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  1353. !ARCH_OMAP) \
  1354. || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1355. || MACH_OMAP_PERSEUS2
  1356. depends on LEDS
  1357. help
  1358. If you say Y here, the red LED will be used to give a good real
  1359. time indication of CPU usage, by lighting whenever the idle task
  1360. is not currently executing.
  1361. The LART uses the same LED for both Timer LED and CPU usage LED
  1362. functions. You may choose to use both, but the Timer LED function
  1363. will overrule the CPU usage LED.
  1364. config ALIGNMENT_TRAP
  1365. bool
  1366. depends on CPU_CP15_MMU
  1367. default y if !ARCH_EBSA110
  1368. select HAVE_PROC_CPU if PROC_FS
  1369. help
  1370. ARM processors cannot fetch/store information which is not
  1371. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1372. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1373. fetch/store instructions will be emulated in software if you say
  1374. here, which has a severe performance impact. This is necessary for
  1375. correct operation of some network protocols. With an IP-only
  1376. configuration it is safe to say N, otherwise say Y.
  1377. config UACCESS_WITH_MEMCPY
  1378. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
  1379. depends on MMU && EXPERIMENTAL
  1380. default y if CPU_FEROCEON
  1381. help
  1382. Implement faster copy_to_user and clear_user methods for CPU
  1383. cores where a 8-word STM instruction give significantly higher
  1384. memory write throughput than a sequence of individual 32bit stores.
  1385. A possible side effect is a slight increase in scheduling latency
  1386. between threads sharing the same address space if they invoke
  1387. such copy operations with large buffers.
  1388. However, if the CPU data cache is using a write-allocate mode,
  1389. this option is unlikely to provide any performance gain.
  1390. config SECCOMP
  1391. bool
  1392. prompt "Enable seccomp to safely compute untrusted bytecode"
  1393. ---help---
  1394. This kernel feature is useful for number crunching applications
  1395. that may need to compute untrusted bytecode during their
  1396. execution. By using pipes or other transports made available to
  1397. the process as file descriptors supporting the read/write
  1398. syscalls, it's possible to isolate those applications in
  1399. their own address space using seccomp. Once seccomp is
  1400. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1401. and the task is only allowed to execute a few safe syscalls
  1402. defined by each seccomp mode.
  1403. config CC_STACKPROTECTOR
  1404. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1405. depends on EXPERIMENTAL
  1406. help
  1407. This option turns on the -fstack-protector GCC feature. This
  1408. feature puts, at the beginning of functions, a canary value on
  1409. the stack just before the return address, and validates
  1410. the value just before actually returning. Stack based buffer
  1411. overflows (that need to overwrite this return address) now also
  1412. overwrite the canary, which gets detected and the attack is then
  1413. neutralized via a kernel panic.
  1414. This feature requires gcc version 4.2 or above.
  1415. config DEPRECATED_PARAM_STRUCT
  1416. bool "Provide old way to pass kernel parameters"
  1417. help
  1418. This was deprecated in 2001 and announced to live on for 5 years.
  1419. Some old boot loaders still use this way.
  1420. endmenu
  1421. menu "Boot options"
  1422. config USE_OF
  1423. bool "Flattened Device Tree support"
  1424. select OF
  1425. select OF_EARLY_FLATTREE
  1426. help
  1427. Include support for flattened device tree machine descriptions.
  1428. # Compressed boot loader in ROM. Yes, we really want to ask about
  1429. # TEXT and BSS so we preserve their values in the config files.
  1430. config ZBOOT_ROM_TEXT
  1431. hex "Compressed ROM boot loader base address"
  1432. default "0"
  1433. help
  1434. The physical address at which the ROM-able zImage is to be
  1435. placed in the target. Platforms which normally make use of
  1436. ROM-able zImage formats normally set this to a suitable
  1437. value in their defconfig file.
  1438. If ZBOOT_ROM is not enabled, this has no effect.
  1439. config ZBOOT_ROM_BSS
  1440. hex "Compressed ROM boot loader BSS address"
  1441. default "0"
  1442. help
  1443. The base address of an area of read/write memory in the target
  1444. for the ROM-able zImage which must be available while the
  1445. decompressor is running. It must be large enough to hold the
  1446. entire decompressed kernel plus an additional 128 KiB.
  1447. Platforms which normally make use of ROM-able zImage formats
  1448. normally set this to a suitable value in their defconfig file.
  1449. If ZBOOT_ROM is not enabled, this has no effect.
  1450. config ZBOOT_ROM
  1451. bool "Compressed boot loader in ROM/flash"
  1452. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1453. help
  1454. Say Y here if you intend to execute your compressed kernel image
  1455. (zImage) directly from ROM or flash. If unsure, say N.
  1456. config ZBOOT_ROM_MMCIF
  1457. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1458. depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
  1459. help
  1460. Say Y here to include experimental MMCIF loading code in the
  1461. ROM-able zImage. With this enabled it is possible to write the
  1462. the ROM-able zImage kernel image to an MMC card and boot the
  1463. kernel straight from the reset vector. At reset the processor
  1464. Mask ROM will load the first part of the the ROM-able zImage
  1465. which in turn loads the rest the kernel image to RAM using the
  1466. MMCIF hardware block.
  1467. config CMDLINE
  1468. string "Default kernel command string"
  1469. default ""
  1470. help
  1471. On some architectures (EBSA110 and CATS), there is currently no way
  1472. for the boot loader to pass arguments to the kernel. For these
  1473. architectures, you should supply some command-line options at build
  1474. time by entering them here. As a minimum, you should specify the
  1475. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1476. choice
  1477. prompt "Kernel command line type" if CMDLINE != ""
  1478. default CMDLINE_FROM_BOOTLOADER
  1479. config CMDLINE_FROM_BOOTLOADER
  1480. bool "Use bootloader kernel arguments if available"
  1481. help
  1482. Uses the command-line options passed by the boot loader. If
  1483. the boot loader doesn't provide any, the default kernel command
  1484. string provided in CMDLINE will be used.
  1485. config CMDLINE_EXTEND
  1486. bool "Extend bootloader kernel arguments"
  1487. help
  1488. The command-line arguments provided by the boot loader will be
  1489. appended to the default kernel command string.
  1490. config CMDLINE_FORCE
  1491. bool "Always use the default kernel command string"
  1492. help
  1493. Always use the default kernel command string, even if the boot
  1494. loader passes other arguments to the kernel.
  1495. This is useful if you cannot or don't want to change the
  1496. command-line options your boot loader passes to the kernel.
  1497. endchoice
  1498. config XIP_KERNEL
  1499. bool "Kernel Execute-In-Place from ROM"
  1500. depends on !ZBOOT_ROM
  1501. help
  1502. Execute-In-Place allows the kernel to run from non-volatile storage
  1503. directly addressable by the CPU, such as NOR flash. This saves RAM
  1504. space since the text section of the kernel is not loaded from flash
  1505. to RAM. Read-write sections, such as the data section and stack,
  1506. are still copied to RAM. The XIP kernel is not compressed since
  1507. it has to run directly from flash, so it will take more space to
  1508. store it. The flash address used to link the kernel object files,
  1509. and for storing it, is configuration dependent. Therefore, if you
  1510. say Y here, you must know the proper physical address where to
  1511. store the kernel image depending on your own flash memory usage.
  1512. Also note that the make target becomes "make xipImage" rather than
  1513. "make zImage" or "make Image". The final kernel binary to put in
  1514. ROM memory will be arch/arm/boot/xipImage.
  1515. If unsure, say N.
  1516. config XIP_PHYS_ADDR
  1517. hex "XIP Kernel Physical Location"
  1518. depends on XIP_KERNEL
  1519. default "0x00080000"
  1520. help
  1521. This is the physical address in your flash memory the kernel will
  1522. be linked for and stored to. This address is dependent on your
  1523. own flash usage.
  1524. config KEXEC
  1525. bool "Kexec system call (EXPERIMENTAL)"
  1526. depends on EXPERIMENTAL
  1527. help
  1528. kexec is a system call that implements the ability to shutdown your
  1529. current kernel, and to start another kernel. It is like a reboot
  1530. but it is independent of the system firmware. And like a reboot
  1531. you can start any kernel with it, not just Linux.
  1532. It is an ongoing process to be certain the hardware in a machine
  1533. is properly shutdown, so do not be surprised if this code does not
  1534. initially work for you. It may help to enable device hotplugging
  1535. support.
  1536. config ATAGS_PROC
  1537. bool "Export atags in procfs"
  1538. depends on KEXEC
  1539. default y
  1540. help
  1541. Should the atags used to boot the kernel be exported in an "atags"
  1542. file in procfs. Useful with kexec.
  1543. config CRASH_DUMP
  1544. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1545. depends on EXPERIMENTAL
  1546. help
  1547. Generate crash dump after being started by kexec. This should
  1548. be normally only set in special crash dump kernels which are
  1549. loaded in the main kernel with kexec-tools into a specially
  1550. reserved region and then later executed after a crash by
  1551. kdump/kexec. The crash dump kernel must be compiled to a
  1552. memory address not used by the main kernel
  1553. For more details see Documentation/kdump/kdump.txt
  1554. config AUTO_ZRELADDR
  1555. bool "Auto calculation of the decompressed kernel image address"
  1556. depends on !ZBOOT_ROM && !ARCH_U300
  1557. help
  1558. ZRELADDR is the physical address where the decompressed kernel
  1559. image will be placed. If AUTO_ZRELADDR is selected, the address
  1560. will be determined at run-time by masking the current IP with
  1561. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1562. from start of memory.
  1563. endmenu
  1564. menu "CPU Power Management"
  1565. if ARCH_HAS_CPUFREQ
  1566. source "drivers/cpufreq/Kconfig"
  1567. config CPU_FREQ_IMX
  1568. tristate "CPUfreq driver for i.MX CPUs"
  1569. depends on ARCH_MXC && CPU_FREQ
  1570. help
  1571. This enables the CPUfreq driver for i.MX CPUs.
  1572. config CPU_FREQ_SA1100
  1573. bool
  1574. config CPU_FREQ_SA1110
  1575. bool
  1576. config CPU_FREQ_INTEGRATOR
  1577. tristate "CPUfreq driver for ARM Integrator CPUs"
  1578. depends on ARCH_INTEGRATOR && CPU_FREQ
  1579. default y
  1580. help
  1581. This enables the CPUfreq driver for ARM Integrator CPUs.
  1582. For details, take a look at <file:Documentation/cpu-freq>.
  1583. If in doubt, say Y.
  1584. config CPU_FREQ_PXA
  1585. bool
  1586. depends on CPU_FREQ && ARCH_PXA && PXA25x
  1587. default y
  1588. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  1589. config CPU_FREQ_S3C64XX
  1590. bool "CPUfreq support for Samsung S3C64XX CPUs"
  1591. depends on CPU_FREQ && CPU_S3C6410
  1592. config CPU_FREQ_S3C
  1593. bool
  1594. help
  1595. Internal configuration node for common cpufreq on Samsung SoC
  1596. config CPU_FREQ_S3C24XX
  1597. bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
  1598. depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
  1599. select CPU_FREQ_S3C
  1600. help
  1601. This enables the CPUfreq driver for the Samsung S3C24XX family
  1602. of CPUs.
  1603. For details, take a look at <file:Documentation/cpu-freq>.
  1604. If in doubt, say N.
  1605. config CPU_FREQ_S3C24XX_PLL
  1606. bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
  1607. depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
  1608. help
  1609. Compile in support for changing the PLL frequency from the
  1610. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1611. after a frequency change, so by default it is not enabled.
  1612. This also means that the PLL tables for the selected CPU(s) will
  1613. be built which may increase the size of the kernel image.
  1614. config CPU_FREQ_S3C24XX_DEBUG
  1615. bool "Debug CPUfreq Samsung driver core"
  1616. depends on CPU_FREQ_S3C24XX
  1617. help
  1618. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1619. config CPU_FREQ_S3C24XX_IODEBUG
  1620. bool "Debug CPUfreq Samsung driver IO timing"
  1621. depends on CPU_FREQ_S3C24XX
  1622. help
  1623. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1624. config CPU_FREQ_S3C24XX_DEBUGFS
  1625. bool "Export debugfs for CPUFreq"
  1626. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1627. help
  1628. Export status information via debugfs.
  1629. endif
  1630. source "drivers/cpuidle/Kconfig"
  1631. endmenu
  1632. menu "Floating point emulation"
  1633. comment "At least one emulation must be selected"
  1634. config FPE_NWFPE
  1635. bool "NWFPE math emulation"
  1636. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1637. ---help---
  1638. Say Y to include the NWFPE floating point emulator in the kernel.
  1639. This is necessary to run most binaries. Linux does not currently
  1640. support floating point hardware so you need to say Y here even if
  1641. your machine has an FPA or floating point co-processor podule.
  1642. You may say N here if you are going to load the Acorn FPEmulator
  1643. early in the bootup.
  1644. config FPE_NWFPE_XP
  1645. bool "Support extended precision"
  1646. depends on FPE_NWFPE
  1647. help
  1648. Say Y to include 80-bit support in the kernel floating-point
  1649. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1650. Note that gcc does not generate 80-bit operations by default,
  1651. so in most cases this option only enlarges the size of the
  1652. floating point emulator without any good reason.
  1653. You almost surely want to say N here.
  1654. config FPE_FASTFPE
  1655. bool "FastFPE math emulation (EXPERIMENTAL)"
  1656. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  1657. ---help---
  1658. Say Y here to include the FAST floating point emulator in the kernel.
  1659. This is an experimental much faster emulator which now also has full
  1660. precision for the mantissa. It does not support any exceptions.
  1661. It is very simple, and approximately 3-6 times faster than NWFPE.
  1662. It should be sufficient for most programs. It may be not suitable
  1663. for scientific calculations, but you have to check this for yourself.
  1664. If you do not feel you need a faster FP emulation you should better
  1665. choose NWFPE.
  1666. config VFP
  1667. bool "VFP-format floating point maths"
  1668. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1669. help
  1670. Say Y to include VFP support code in the kernel. This is needed
  1671. if your hardware includes a VFP unit.
  1672. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1673. release notes and additional status information.
  1674. Say N if your target does not have VFP hardware.
  1675. config VFPv3
  1676. bool
  1677. depends on VFP
  1678. default y if CPU_V7
  1679. config NEON
  1680. bool "Advanced SIMD (NEON) Extension support"
  1681. depends on VFPv3 && CPU_V7
  1682. help
  1683. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1684. Extension.
  1685. endmenu
  1686. menu "Userspace binary formats"
  1687. source "fs/Kconfig.binfmt"
  1688. config ARTHUR
  1689. tristate "RISC OS personality"
  1690. depends on !AEABI
  1691. help
  1692. Say Y here to include the kernel code necessary if you want to run
  1693. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1694. experimental; if this sounds frightening, say N and sleep in peace.
  1695. You can also say M here to compile this support as a module (which
  1696. will be called arthur).
  1697. endmenu
  1698. menu "Power management options"
  1699. source "kernel/power/Kconfig"
  1700. config ARCH_SUSPEND_POSSIBLE
  1701. depends on !ARCH_S5P64X0 && !ARCH_S5PC100
  1702. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1703. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
  1704. def_bool y
  1705. endmenu
  1706. source "net/Kconfig"
  1707. source "drivers/Kconfig"
  1708. source "fs/Kconfig"
  1709. source "arch/arm/Kconfig.debug"
  1710. source "security/Kconfig"
  1711. source "crypto/Kconfig"
  1712. source "lib/Kconfig"