Kconfig 63 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
  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. select CPU_PM if (SUSPEND || CPU_IDLE)
  33. help
  34. The ARM series is a line of low-power-consumption RISC chip designs
  35. licensed by ARM Ltd and targeted at embedded applications and
  36. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  37. manufactured, but legacy ARM-based PC hardware remains popular in
  38. Europe. There is an ARM Linux project with a web page at
  39. <http://www.arm.linux.org.uk/>.
  40. config ARM_HAS_SG_CHAIN
  41. bool
  42. config HAVE_PWM
  43. bool
  44. config MIGHT_HAVE_PCI
  45. bool
  46. config SYS_SUPPORTS_APM_EMULATION
  47. bool
  48. config HAVE_SCHED_CLOCK
  49. bool
  50. config GENERIC_GPIO
  51. bool
  52. config ARCH_USES_GETTIMEOFFSET
  53. bool
  54. default n
  55. config GENERIC_CLOCKEVENTS
  56. bool
  57. config GENERIC_CLOCKEVENTS_BROADCAST
  58. bool
  59. depends on GENERIC_CLOCKEVENTS
  60. default y if SMP
  61. config KTIME_SCALAR
  62. bool
  63. default y
  64. config HAVE_TCM
  65. bool
  66. select GENERIC_ALLOCATOR
  67. config HAVE_PROC_CPU
  68. bool
  69. config NO_IOPORT
  70. bool
  71. config EISA
  72. bool
  73. ---help---
  74. The Extended Industry Standard Architecture (EISA) bus was
  75. developed as an open alternative to the IBM MicroChannel bus.
  76. The EISA bus provided some of the features of the IBM MicroChannel
  77. bus while maintaining backward compatibility with cards made for
  78. the older ISA bus. The EISA bus saw limited use between 1988 and
  79. 1995 when it was made obsolete by the PCI bus.
  80. Say Y here if you are building a kernel for an EISA-based machine.
  81. Otherwise, say N.
  82. config SBUS
  83. bool
  84. config MCA
  85. bool
  86. help
  87. MicroChannel Architecture is found in some IBM PS/2 machines and
  88. laptops. It is a bus system similar to PCI or ISA. See
  89. <file:Documentation/mca.txt> (and especially the web page given
  90. there) before attempting to build an MCA bus kernel.
  91. config STACKTRACE_SUPPORT
  92. bool
  93. default y
  94. config HAVE_LATENCYTOP_SUPPORT
  95. bool
  96. depends on !SMP
  97. default y
  98. config LOCKDEP_SUPPORT
  99. bool
  100. default y
  101. config TRACE_IRQFLAGS_SUPPORT
  102. bool
  103. default y
  104. config HARDIRQS_SW_RESEND
  105. bool
  106. default y
  107. config GENERIC_IRQ_PROBE
  108. bool
  109. default y
  110. config GENERIC_LOCKBREAK
  111. bool
  112. default y
  113. depends on SMP && PREEMPT
  114. config RWSEM_GENERIC_SPINLOCK
  115. bool
  116. default y
  117. config RWSEM_XCHGADD_ALGORITHM
  118. bool
  119. config ARCH_HAS_ILOG2_U32
  120. bool
  121. config ARCH_HAS_ILOG2_U64
  122. bool
  123. config ARCH_HAS_CPUFREQ
  124. bool
  125. help
  126. Internal node to signify that the ARCH has CPUFREQ support
  127. and that the relevant menu configurations are displayed for
  128. it.
  129. config ARCH_HAS_CPU_IDLE_WAIT
  130. def_bool y
  131. config GENERIC_HWEIGHT
  132. bool
  133. default y
  134. config GENERIC_CALIBRATE_DELAY
  135. bool
  136. default y
  137. config ARCH_MAY_HAVE_PC_FDC
  138. bool
  139. config ZONE_DMA
  140. bool
  141. config NEED_DMA_MAP_STATE
  142. def_bool y
  143. config GENERIC_ISA_DMA
  144. bool
  145. config FIQ
  146. bool
  147. config ARCH_MTD_XIP
  148. bool
  149. config VECTORS_BASE
  150. hex
  151. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  152. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  153. default 0x00000000
  154. help
  155. The base address of exception vectors.
  156. config ARM_PATCH_PHYS_VIRT
  157. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  158. default y
  159. depends on !XIP_KERNEL && MMU
  160. depends on !ARCH_REALVIEW || !SPARSEMEM
  161. help
  162. Patch phys-to-virt and virt-to-phys translation functions at
  163. boot and module load time according to the position of the
  164. kernel in system memory.
  165. This can only be used with non-XIP MMU kernels where the base
  166. of physical memory is at a 16MB boundary.
  167. Only disable this option if you know that you do not require
  168. this feature (eg, building a kernel for a single machine) and
  169. you need to shrink the kernel to the minimal size.
  170. config NEED_MACH_MEMORY_H
  171. bool
  172. help
  173. Select this when mach/memory.h is required to provide special
  174. definitions for this platform. The need for mach/memory.h should
  175. be avoided when possible.
  176. config PHYS_OFFSET
  177. hex "Physical address of main memory"
  178. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  179. help
  180. Please provide the physical address corresponding to the
  181. location of main memory in your system.
  182. source "init/Kconfig"
  183. source "kernel/Kconfig.freezer"
  184. menu "System Type"
  185. config MMU
  186. bool "MMU-based Paged Memory Management Support"
  187. default y
  188. help
  189. Select if you want MMU-based virtualised addressing space
  190. support by paged memory management. If unsure, say 'Y'.
  191. #
  192. # The "ARM system type" choice list is ordered alphabetically by option
  193. # text. Please add new entries in the option alphabetic order.
  194. #
  195. choice
  196. prompt "ARM system type"
  197. default ARCH_VERSATILE
  198. config ARCH_INTEGRATOR
  199. bool "ARM Ltd. Integrator family"
  200. select ARM_AMBA
  201. select ARCH_HAS_CPUFREQ
  202. select CLKDEV_LOOKUP
  203. select HAVE_MACH_CLKDEV
  204. select ICST
  205. select GENERIC_CLOCKEVENTS
  206. select PLAT_VERSATILE
  207. select PLAT_VERSATILE_FPGA_IRQ
  208. select NEED_MACH_MEMORY_H
  209. help
  210. Support for ARM's Integrator platform.
  211. config ARCH_REALVIEW
  212. bool "ARM Ltd. RealView family"
  213. select ARM_AMBA
  214. select CLKDEV_LOOKUP
  215. select HAVE_MACH_CLKDEV
  216. select ICST
  217. select GENERIC_CLOCKEVENTS
  218. select ARCH_WANT_OPTIONAL_GPIOLIB
  219. select PLAT_VERSATILE
  220. select PLAT_VERSATILE_CLCD
  221. select ARM_TIMER_SP804
  222. select GPIO_PL061 if GPIOLIB
  223. select NEED_MACH_MEMORY_H
  224. help
  225. This enables support for ARM Ltd RealView boards.
  226. config ARCH_VERSATILE
  227. bool "ARM Ltd. Versatile family"
  228. select ARM_AMBA
  229. select ARM_VIC
  230. select CLKDEV_LOOKUP
  231. select HAVE_MACH_CLKDEV
  232. select ICST
  233. select GENERIC_CLOCKEVENTS
  234. select ARCH_WANT_OPTIONAL_GPIOLIB
  235. select PLAT_VERSATILE
  236. select PLAT_VERSATILE_CLCD
  237. select PLAT_VERSATILE_FPGA_IRQ
  238. select ARM_TIMER_SP804
  239. help
  240. This enables support for ARM Ltd Versatile board.
  241. config ARCH_VEXPRESS
  242. bool "ARM Ltd. Versatile Express family"
  243. select ARCH_WANT_OPTIONAL_GPIOLIB
  244. select ARM_AMBA
  245. select ARM_TIMER_SP804
  246. select CLKDEV_LOOKUP
  247. select HAVE_MACH_CLKDEV
  248. select GENERIC_CLOCKEVENTS
  249. select HAVE_CLK
  250. select HAVE_PATA_PLATFORM
  251. select ICST
  252. select PLAT_VERSATILE
  253. select PLAT_VERSATILE_CLCD
  254. help
  255. This enables support for the ARM Ltd Versatile Express boards.
  256. config ARCH_AT91
  257. bool "Atmel AT91"
  258. select ARCH_REQUIRE_GPIOLIB
  259. select HAVE_CLK
  260. select CLKDEV_LOOKUP
  261. help
  262. This enables support for systems based on the Atmel AT91RM9200,
  263. AT91SAM9 and AT91CAP9 processors.
  264. config ARCH_BCMRING
  265. bool "Broadcom BCMRING"
  266. depends on MMU
  267. select CPU_V6
  268. select ARM_AMBA
  269. select ARM_TIMER_SP804
  270. select CLKDEV_LOOKUP
  271. select GENERIC_CLOCKEVENTS
  272. select ARCH_WANT_OPTIONAL_GPIOLIB
  273. help
  274. Support for Broadcom's BCMRing platform.
  275. config ARCH_HIGHBANK
  276. bool "Calxeda Highbank-based"
  277. select ARCH_WANT_OPTIONAL_GPIOLIB
  278. select ARM_AMBA
  279. select ARM_GIC
  280. select ARM_TIMER_SP804
  281. select CLKDEV_LOOKUP
  282. select CPU_V7
  283. select GENERIC_CLOCKEVENTS
  284. select HAVE_ARM_SCU
  285. select USE_OF
  286. help
  287. Support for the Calxeda Highbank SoC based boards.
  288. config ARCH_CLPS711X
  289. bool "Cirrus Logic CLPS711x/EP721x-based"
  290. select CPU_ARM720T
  291. select ARCH_USES_GETTIMEOFFSET
  292. select NEED_MACH_MEMORY_H
  293. help
  294. Support for Cirrus Logic 711x/721x based boards.
  295. config ARCH_CNS3XXX
  296. bool "Cavium Networks CNS3XXX family"
  297. select CPU_V6K
  298. select GENERIC_CLOCKEVENTS
  299. select ARM_GIC
  300. select MIGHT_HAVE_PCI
  301. select PCI_DOMAINS if PCI
  302. help
  303. Support for Cavium Networks CNS3XXX platform.
  304. config ARCH_GEMINI
  305. bool "Cortina Systems Gemini"
  306. select CPU_FA526
  307. select ARCH_REQUIRE_GPIOLIB
  308. select ARCH_USES_GETTIMEOFFSET
  309. help
  310. Support for the Cortina Systems Gemini family SoCs
  311. config ARCH_PRIMA2
  312. bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
  313. select CPU_V7
  314. select GENERIC_TIME
  315. select NO_IOPORT
  316. select GENERIC_CLOCKEVENTS
  317. select CLKDEV_LOOKUP
  318. select GENERIC_IRQ_CHIP
  319. select USE_OF
  320. select ZONE_DMA
  321. help
  322. Support for CSR SiRFSoC ARM Cortex A9 Platform
  323. config ARCH_EBSA110
  324. bool "EBSA-110"
  325. select CPU_SA110
  326. select ISA
  327. select NO_IOPORT
  328. select ARCH_USES_GETTIMEOFFSET
  329. select NEED_MACH_MEMORY_H
  330. help
  331. This is an evaluation board for the StrongARM processor available
  332. from Digital. It has limited hardware on-board, including an
  333. Ethernet interface, two PCMCIA sockets, two serial ports and a
  334. parallel port.
  335. config ARCH_EP93XX
  336. bool "EP93xx-based"
  337. select CPU_ARM920T
  338. select ARM_AMBA
  339. select ARM_VIC
  340. select CLKDEV_LOOKUP
  341. select ARCH_REQUIRE_GPIOLIB
  342. select ARCH_HAS_HOLES_MEMORYMODEL
  343. select ARCH_USES_GETTIMEOFFSET
  344. select NEED_MEMORY_H
  345. help
  346. This enables support for the Cirrus EP93xx series of CPUs.
  347. config ARCH_FOOTBRIDGE
  348. bool "FootBridge"
  349. select CPU_SA110
  350. select FOOTBRIDGE
  351. select GENERIC_CLOCKEVENTS
  352. select NEED_MACH_MEMORY_H
  353. help
  354. Support for systems based on the DC21285 companion chip
  355. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  356. config ARCH_MXC
  357. bool "Freescale MXC/iMX-based"
  358. select GENERIC_CLOCKEVENTS
  359. select ARCH_REQUIRE_GPIOLIB
  360. select CLKDEV_LOOKUP
  361. select CLKSRC_MMIO
  362. select GENERIC_IRQ_CHIP
  363. select HAVE_SCHED_CLOCK
  364. select MULTI_IRQ_HANDLER
  365. help
  366. Support for Freescale MXC/iMX-based family of processors
  367. config ARCH_MXS
  368. bool "Freescale MXS-based"
  369. select GENERIC_CLOCKEVENTS
  370. select ARCH_REQUIRE_GPIOLIB
  371. select CLKDEV_LOOKUP
  372. select CLKSRC_MMIO
  373. help
  374. Support for Freescale MXS-based family of processors
  375. config ARCH_NETX
  376. bool "Hilscher NetX based"
  377. select CLKSRC_MMIO
  378. select CPU_ARM926T
  379. select ARM_VIC
  380. select GENERIC_CLOCKEVENTS
  381. help
  382. This enables support for systems based on the Hilscher NetX Soc
  383. config ARCH_H720X
  384. bool "Hynix HMS720x-based"
  385. select CPU_ARM720T
  386. select ISA_DMA_API
  387. select ARCH_USES_GETTIMEOFFSET
  388. help
  389. This enables support for systems based on the Hynix HMS720x
  390. config ARCH_IOP13XX
  391. bool "IOP13xx-based"
  392. depends on MMU
  393. select CPU_XSC3
  394. select PLAT_IOP
  395. select PCI
  396. select ARCH_SUPPORTS_MSI
  397. select VMSPLIT_1G
  398. select NEED_MACH_MEMORY_H
  399. help
  400. Support for Intel's IOP13XX (XScale) family of processors.
  401. config ARCH_IOP32X
  402. bool "IOP32x-based"
  403. depends on MMU
  404. select CPU_XSCALE
  405. select PLAT_IOP
  406. select PCI
  407. select ARCH_REQUIRE_GPIOLIB
  408. help
  409. Support for Intel's 80219 and IOP32X (XScale) family of
  410. processors.
  411. config ARCH_IOP33X
  412. bool "IOP33x-based"
  413. depends on MMU
  414. select CPU_XSCALE
  415. select PLAT_IOP
  416. select PCI
  417. select ARCH_REQUIRE_GPIOLIB
  418. help
  419. Support for Intel's IOP33X (XScale) family of processors.
  420. config ARCH_IXP23XX
  421. bool "IXP23XX-based"
  422. depends on MMU
  423. select CPU_XSC3
  424. select PCI
  425. select ARCH_USES_GETTIMEOFFSET
  426. select NEED_MACH_MEMORY_H
  427. help
  428. Support for Intel's IXP23xx (XScale) family of processors.
  429. config ARCH_IXP2000
  430. bool "IXP2400/2800-based"
  431. depends on MMU
  432. select CPU_XSCALE
  433. select PCI
  434. select ARCH_USES_GETTIMEOFFSET
  435. select NEED_MACH_MEMORY_H
  436. help
  437. Support for Intel's IXP2400/2800 (XScale) family of processors.
  438. config ARCH_IXP4XX
  439. bool "IXP4xx-based"
  440. depends on MMU
  441. select CLKSRC_MMIO
  442. select CPU_XSCALE
  443. select GENERIC_GPIO
  444. select GENERIC_CLOCKEVENTS
  445. select HAVE_SCHED_CLOCK
  446. select MIGHT_HAVE_PCI
  447. select DMABOUNCE if PCI
  448. help
  449. Support for Intel's IXP4XX (XScale) family of processors.
  450. config ARCH_DOVE
  451. bool "Marvell Dove"
  452. select CPU_V7
  453. select PCI
  454. select ARCH_REQUIRE_GPIOLIB
  455. select GENERIC_CLOCKEVENTS
  456. select PLAT_ORION
  457. help
  458. Support for the Marvell Dove SoC 88AP510
  459. config ARCH_KIRKWOOD
  460. bool "Marvell Kirkwood"
  461. select CPU_FEROCEON
  462. select PCI
  463. select ARCH_REQUIRE_GPIOLIB
  464. select GENERIC_CLOCKEVENTS
  465. select PLAT_ORION
  466. help
  467. Support for the following Marvell Kirkwood series SoCs:
  468. 88F6180, 88F6192 and 88F6281.
  469. config ARCH_LPC32XX
  470. bool "NXP LPC32XX"
  471. select CLKSRC_MMIO
  472. select CPU_ARM926T
  473. select ARCH_REQUIRE_GPIOLIB
  474. select HAVE_IDE
  475. select ARM_AMBA
  476. select USB_ARCH_HAS_OHCI
  477. select CLKDEV_LOOKUP
  478. select GENERIC_TIME
  479. select GENERIC_CLOCKEVENTS
  480. help
  481. Support for the NXP LPC32XX family of processors
  482. config ARCH_MV78XX0
  483. bool "Marvell MV78xx0"
  484. select CPU_FEROCEON
  485. select PCI
  486. select ARCH_REQUIRE_GPIOLIB
  487. select GENERIC_CLOCKEVENTS
  488. select PLAT_ORION
  489. help
  490. Support for the following Marvell MV78xx0 series SoCs:
  491. MV781x0, MV782x0.
  492. config ARCH_ORION5X
  493. bool "Marvell Orion"
  494. depends on MMU
  495. select CPU_FEROCEON
  496. select PCI
  497. select ARCH_REQUIRE_GPIOLIB
  498. select GENERIC_CLOCKEVENTS
  499. select PLAT_ORION
  500. help
  501. Support for the following Marvell Orion 5x series SoCs:
  502. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  503. Orion-2 (5281), Orion-1-90 (6183).
  504. config ARCH_MMP
  505. bool "Marvell PXA168/910/MMP2"
  506. depends on MMU
  507. select ARCH_REQUIRE_GPIOLIB
  508. select CLKDEV_LOOKUP
  509. select GENERIC_CLOCKEVENTS
  510. select HAVE_SCHED_CLOCK
  511. select TICK_ONESHOT
  512. select PLAT_PXA
  513. select SPARSE_IRQ
  514. help
  515. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  516. config ARCH_KS8695
  517. bool "Micrel/Kendin KS8695"
  518. select CPU_ARM922T
  519. select ARCH_REQUIRE_GPIOLIB
  520. select ARCH_USES_GETTIMEOFFSET
  521. select NEED_MACH_MEMORY_H
  522. help
  523. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  524. System-on-Chip devices.
  525. config ARCH_W90X900
  526. bool "Nuvoton W90X900 CPU"
  527. select CPU_ARM926T
  528. select ARCH_REQUIRE_GPIOLIB
  529. select CLKDEV_LOOKUP
  530. select CLKSRC_MMIO
  531. select GENERIC_CLOCKEVENTS
  532. help
  533. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  534. At present, the w90x900 has been renamed nuc900, regarding
  535. the ARM series product line, you can login the following
  536. link address to know more.
  537. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  538. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  539. config ARCH_NUC93X
  540. bool "Nuvoton NUC93X CPU"
  541. select CPU_ARM926T
  542. select CLKDEV_LOOKUP
  543. help
  544. Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
  545. low-power and high performance MPEG-4/JPEG multimedia controller chip.
  546. config ARCH_TEGRA
  547. bool "NVIDIA Tegra"
  548. select CLKDEV_LOOKUP
  549. select CLKSRC_MMIO
  550. select GENERIC_TIME
  551. select GENERIC_CLOCKEVENTS
  552. select GENERIC_GPIO
  553. select HAVE_CLK
  554. select HAVE_SCHED_CLOCK
  555. select ARCH_HAS_CPUFREQ
  556. help
  557. This enables support for NVIDIA Tegra based systems (Tegra APX,
  558. Tegra 6xx and Tegra 2 series).
  559. config ARCH_PNX4008
  560. bool "Philips Nexperia PNX4008 Mobile"
  561. select CPU_ARM926T
  562. select CLKDEV_LOOKUP
  563. select ARCH_USES_GETTIMEOFFSET
  564. help
  565. This enables support for Philips PNX4008 mobile platform.
  566. config ARCH_PXA
  567. bool "PXA2xx/PXA3xx-based"
  568. depends on MMU
  569. select ARCH_MTD_XIP
  570. select ARCH_HAS_CPUFREQ
  571. select CLKDEV_LOOKUP
  572. select CLKSRC_MMIO
  573. select ARCH_REQUIRE_GPIOLIB
  574. select GENERIC_CLOCKEVENTS
  575. select HAVE_SCHED_CLOCK
  576. select TICK_ONESHOT
  577. select PLAT_PXA
  578. select SPARSE_IRQ
  579. select AUTO_ZRELADDR
  580. select MULTI_IRQ_HANDLER
  581. help
  582. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  583. config ARCH_MSM
  584. bool "Qualcomm MSM"
  585. select HAVE_CLK
  586. select GENERIC_CLOCKEVENTS
  587. select ARCH_REQUIRE_GPIOLIB
  588. select CLKDEV_LOOKUP
  589. help
  590. Support for Qualcomm MSM/QSD based systems. This runs on the
  591. apps processor of the MSM/QSD and depends on a shared memory
  592. interface to the modem processor which runs the baseband
  593. stack and controls some vital subsystems
  594. (clock and power control, etc).
  595. config ARCH_SHMOBILE
  596. bool "Renesas SH-Mobile / R-Mobile"
  597. select HAVE_CLK
  598. select CLKDEV_LOOKUP
  599. select HAVE_MACH_CLKDEV
  600. select GENERIC_CLOCKEVENTS
  601. select NO_IOPORT
  602. select SPARSE_IRQ
  603. select MULTI_IRQ_HANDLER
  604. select PM_GENERIC_DOMAINS if PM
  605. select NEED_MACH_MEMORY_H
  606. help
  607. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  608. config ARCH_RPC
  609. bool "RiscPC"
  610. select ARCH_ACORN
  611. select FIQ
  612. select TIMER_ACORN
  613. select ARCH_MAY_HAVE_PC_FDC
  614. select HAVE_PATA_PLATFORM
  615. select ISA_DMA_API
  616. select NO_IOPORT
  617. select ARCH_SPARSEMEM_ENABLE
  618. select ARCH_USES_GETTIMEOFFSET
  619. select NEED_MACH_MEMORY_H
  620. help
  621. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  622. CD-ROM interface, serial and parallel port, and the floppy drive.
  623. config ARCH_SA1100
  624. bool "SA1100-based"
  625. select CLKSRC_MMIO
  626. select CPU_SA1100
  627. select ISA
  628. select ARCH_SPARSEMEM_ENABLE
  629. select ARCH_MTD_XIP
  630. select ARCH_HAS_CPUFREQ
  631. select CPU_FREQ
  632. select GENERIC_CLOCKEVENTS
  633. select HAVE_CLK
  634. select HAVE_SCHED_CLOCK
  635. select TICK_ONESHOT
  636. select ARCH_REQUIRE_GPIOLIB
  637. select NEED_MACH_MEMORY_H
  638. help
  639. Support for StrongARM 11x0 based boards.
  640. config ARCH_S3C2410
  641. bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
  642. select GENERIC_GPIO
  643. select ARCH_HAS_CPUFREQ
  644. select HAVE_CLK
  645. select CLKDEV_LOOKUP
  646. select ARCH_USES_GETTIMEOFFSET
  647. select HAVE_S3C2410_I2C if I2C
  648. help
  649. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  650. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  651. the Samsung SMDK2410 development board (and derivatives).
  652. Note, the S3C2416 and the S3C2450 are so close that they even share
  653. the same SoC ID code. This means that there is no separate machine
  654. directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
  655. config ARCH_S3C64XX
  656. bool "Samsung S3C64XX"
  657. select PLAT_SAMSUNG
  658. select CPU_V6
  659. select ARM_VIC
  660. select HAVE_CLK
  661. select CLKDEV_LOOKUP
  662. select NO_IOPORT
  663. select ARCH_USES_GETTIMEOFFSET
  664. select ARCH_HAS_CPUFREQ
  665. select ARCH_REQUIRE_GPIOLIB
  666. select SAMSUNG_CLKSRC
  667. select SAMSUNG_IRQ_VIC_TIMER
  668. select SAMSUNG_IRQ_UART
  669. select S3C_GPIO_TRACK
  670. select S3C_GPIO_PULL_UPDOWN
  671. select S3C_GPIO_CFG_S3C24XX
  672. select S3C_GPIO_CFG_S3C64XX
  673. select S3C_DEV_NAND
  674. select USB_ARCH_HAS_OHCI
  675. select SAMSUNG_GPIOLIB_4BIT
  676. select HAVE_S3C2410_I2C if I2C
  677. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  678. help
  679. Samsung S3C64XX series based systems
  680. config ARCH_S5P64X0
  681. bool "Samsung S5P6440 S5P6450"
  682. select CPU_V6
  683. select GENERIC_GPIO
  684. select HAVE_CLK
  685. select CLKDEV_LOOKUP
  686. select CLKSRC_MMIO
  687. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  688. select GENERIC_CLOCKEVENTS
  689. select HAVE_SCHED_CLOCK
  690. select HAVE_S3C2410_I2C if I2C
  691. select HAVE_S3C_RTC if RTC_CLASS
  692. help
  693. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  694. SMDK6450.
  695. config ARCH_S5PC100
  696. bool "Samsung S5PC100"
  697. select GENERIC_GPIO
  698. select HAVE_CLK
  699. select CLKDEV_LOOKUP
  700. select CPU_V7
  701. select ARM_L1_CACHE_SHIFT_6
  702. select ARCH_USES_GETTIMEOFFSET
  703. select HAVE_S3C2410_I2C if I2C
  704. select HAVE_S3C_RTC if RTC_CLASS
  705. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  706. help
  707. Samsung S5PC100 series based systems
  708. config ARCH_S5PV210
  709. bool "Samsung S5PV210/S5PC110"
  710. select CPU_V7
  711. select ARCH_SPARSEMEM_ENABLE
  712. select ARCH_HAS_HOLES_MEMORYMODEL
  713. select GENERIC_GPIO
  714. select HAVE_CLK
  715. select CLKDEV_LOOKUP
  716. select CLKSRC_MMIO
  717. select ARM_L1_CACHE_SHIFT_6
  718. select ARCH_HAS_CPUFREQ
  719. select GENERIC_CLOCKEVENTS
  720. select HAVE_SCHED_CLOCK
  721. select HAVE_S3C2410_I2C if I2C
  722. select HAVE_S3C_RTC if RTC_CLASS
  723. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  724. select NEED_MACH_MEMORY_H
  725. help
  726. Samsung S5PV210/S5PC110 series based systems
  727. config ARCH_EXYNOS4
  728. bool "Samsung EXYNOS4"
  729. select CPU_V7
  730. select ARCH_SPARSEMEM_ENABLE
  731. select ARCH_HAS_HOLES_MEMORYMODEL
  732. select GENERIC_GPIO
  733. select HAVE_CLK
  734. select CLKDEV_LOOKUP
  735. select ARCH_HAS_CPUFREQ
  736. select GENERIC_CLOCKEVENTS
  737. select HAVE_S3C_RTC if RTC_CLASS
  738. select HAVE_S3C2410_I2C if I2C
  739. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  740. select NEED_MACH_MEMORY_H
  741. help
  742. Samsung EXYNOS4 series based systems
  743. config ARCH_SHARK
  744. bool "Shark"
  745. select CPU_SA110
  746. select ISA
  747. select ISA_DMA
  748. select ZONE_DMA
  749. select PCI
  750. select ARCH_USES_GETTIMEOFFSET
  751. select NEED_MACH_MEMORY_H
  752. help
  753. Support for the StrongARM based Digital DNARD machine, also known
  754. as "Shark" (<http://www.shark-linux.de/shark.html>).
  755. config ARCH_TCC_926
  756. bool "Telechips TCC ARM926-based systems"
  757. select CLKSRC_MMIO
  758. select CPU_ARM926T
  759. select HAVE_CLK
  760. select CLKDEV_LOOKUP
  761. select GENERIC_CLOCKEVENTS
  762. help
  763. Support for Telechips TCC ARM926-based systems.
  764. config ARCH_U300
  765. bool "ST-Ericsson U300 Series"
  766. depends on MMU
  767. select CLKSRC_MMIO
  768. select CPU_ARM926T
  769. select HAVE_SCHED_CLOCK
  770. select HAVE_TCM
  771. select ARM_AMBA
  772. select ARM_VIC
  773. select GENERIC_CLOCKEVENTS
  774. select CLKDEV_LOOKUP
  775. select HAVE_MACH_CLKDEV
  776. select GENERIC_GPIO
  777. select ARCH_REQUIRE_GPIOLIB
  778. select NEED_MACH_MEMORY_H
  779. help
  780. Support for ST-Ericsson U300 series mobile platforms.
  781. config ARCH_U8500
  782. bool "ST-Ericsson U8500 Series"
  783. select CPU_V7
  784. select ARM_AMBA
  785. select GENERIC_CLOCKEVENTS
  786. select CLKDEV_LOOKUP
  787. select ARCH_REQUIRE_GPIOLIB
  788. select ARCH_HAS_CPUFREQ
  789. help
  790. Support for ST-Ericsson's Ux500 architecture
  791. config ARCH_NOMADIK
  792. bool "STMicroelectronics Nomadik"
  793. select ARM_AMBA
  794. select ARM_VIC
  795. select CPU_ARM926T
  796. select CLKDEV_LOOKUP
  797. select GENERIC_CLOCKEVENTS
  798. select ARCH_REQUIRE_GPIOLIB
  799. help
  800. Support for the Nomadik platform by ST-Ericsson
  801. config ARCH_DAVINCI
  802. bool "TI DaVinci"
  803. select GENERIC_CLOCKEVENTS
  804. select ARCH_REQUIRE_GPIOLIB
  805. select ZONE_DMA
  806. select HAVE_IDE
  807. select CLKDEV_LOOKUP
  808. select GENERIC_ALLOCATOR
  809. select GENERIC_IRQ_CHIP
  810. select ARCH_HAS_HOLES_MEMORYMODEL
  811. help
  812. Support for TI's DaVinci platform.
  813. config ARCH_OMAP
  814. bool "TI OMAP"
  815. select HAVE_CLK
  816. select ARCH_REQUIRE_GPIOLIB
  817. select ARCH_HAS_CPUFREQ
  818. select CLKSRC_MMIO
  819. select GENERIC_CLOCKEVENTS
  820. select HAVE_SCHED_CLOCK
  821. select ARCH_HAS_HOLES_MEMORYMODEL
  822. help
  823. Support for TI's OMAP platform (OMAP1/2/3/4).
  824. config PLAT_SPEAR
  825. bool "ST SPEAr"
  826. select ARM_AMBA
  827. select ARCH_REQUIRE_GPIOLIB
  828. select CLKDEV_LOOKUP
  829. select CLKSRC_MMIO
  830. select GENERIC_CLOCKEVENTS
  831. select HAVE_CLK
  832. help
  833. Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
  834. config ARCH_VT8500
  835. bool "VIA/WonderMedia 85xx"
  836. select CPU_ARM926T
  837. select GENERIC_GPIO
  838. select ARCH_HAS_CPUFREQ
  839. select GENERIC_CLOCKEVENTS
  840. select ARCH_REQUIRE_GPIOLIB
  841. select HAVE_PWM
  842. help
  843. Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
  844. config ARCH_ZYNQ
  845. bool "Xilinx Zynq ARM Cortex A9 Platform"
  846. select CPU_V7
  847. select GENERIC_TIME
  848. select GENERIC_CLOCKEVENTS
  849. select CLKDEV_LOOKUP
  850. select ARM_GIC
  851. select ARM_AMBA
  852. select ICST
  853. select USE_OF
  854. help
  855. Support for Xilinx Zynq ARM Cortex A9 Platform
  856. endchoice
  857. #
  858. # This is sorted alphabetically by mach-* pathname. However, plat-*
  859. # Kconfigs may be included either alphabetically (according to the
  860. # plat- suffix) or along side the corresponding mach-* source.
  861. #
  862. source "arch/arm/mach-at91/Kconfig"
  863. source "arch/arm/mach-bcmring/Kconfig"
  864. source "arch/arm/mach-clps711x/Kconfig"
  865. source "arch/arm/mach-cns3xxx/Kconfig"
  866. source "arch/arm/mach-davinci/Kconfig"
  867. source "arch/arm/mach-dove/Kconfig"
  868. source "arch/arm/mach-ep93xx/Kconfig"
  869. source "arch/arm/mach-footbridge/Kconfig"
  870. source "arch/arm/mach-gemini/Kconfig"
  871. source "arch/arm/mach-h720x/Kconfig"
  872. source "arch/arm/mach-integrator/Kconfig"
  873. source "arch/arm/mach-iop32x/Kconfig"
  874. source "arch/arm/mach-iop33x/Kconfig"
  875. source "arch/arm/mach-iop13xx/Kconfig"
  876. source "arch/arm/mach-ixp4xx/Kconfig"
  877. source "arch/arm/mach-ixp2000/Kconfig"
  878. source "arch/arm/mach-ixp23xx/Kconfig"
  879. source "arch/arm/mach-kirkwood/Kconfig"
  880. source "arch/arm/mach-ks8695/Kconfig"
  881. source "arch/arm/mach-lpc32xx/Kconfig"
  882. source "arch/arm/mach-msm/Kconfig"
  883. source "arch/arm/mach-mv78xx0/Kconfig"
  884. source "arch/arm/plat-mxc/Kconfig"
  885. source "arch/arm/mach-mxs/Kconfig"
  886. source "arch/arm/mach-netx/Kconfig"
  887. source "arch/arm/mach-nomadik/Kconfig"
  888. source "arch/arm/plat-nomadik/Kconfig"
  889. source "arch/arm/mach-nuc93x/Kconfig"
  890. source "arch/arm/plat-omap/Kconfig"
  891. source "arch/arm/mach-omap1/Kconfig"
  892. source "arch/arm/mach-omap2/Kconfig"
  893. source "arch/arm/mach-orion5x/Kconfig"
  894. source "arch/arm/mach-pxa/Kconfig"
  895. source "arch/arm/plat-pxa/Kconfig"
  896. source "arch/arm/mach-mmp/Kconfig"
  897. source "arch/arm/mach-realview/Kconfig"
  898. source "arch/arm/mach-sa1100/Kconfig"
  899. source "arch/arm/plat-samsung/Kconfig"
  900. source "arch/arm/plat-s3c24xx/Kconfig"
  901. source "arch/arm/plat-s5p/Kconfig"
  902. source "arch/arm/plat-spear/Kconfig"
  903. source "arch/arm/plat-tcc/Kconfig"
  904. if ARCH_S3C2410
  905. source "arch/arm/mach-s3c2410/Kconfig"
  906. source "arch/arm/mach-s3c2412/Kconfig"
  907. source "arch/arm/mach-s3c2416/Kconfig"
  908. source "arch/arm/mach-s3c2440/Kconfig"
  909. source "arch/arm/mach-s3c2443/Kconfig"
  910. endif
  911. if ARCH_S3C64XX
  912. source "arch/arm/mach-s3c64xx/Kconfig"
  913. endif
  914. source "arch/arm/mach-s5p64x0/Kconfig"
  915. source "arch/arm/mach-s5pc100/Kconfig"
  916. source "arch/arm/mach-s5pv210/Kconfig"
  917. source "arch/arm/mach-exynos4/Kconfig"
  918. source "arch/arm/mach-shmobile/Kconfig"
  919. source "arch/arm/mach-tegra/Kconfig"
  920. source "arch/arm/mach-u300/Kconfig"
  921. source "arch/arm/mach-ux500/Kconfig"
  922. source "arch/arm/mach-versatile/Kconfig"
  923. source "arch/arm/mach-vexpress/Kconfig"
  924. source "arch/arm/plat-versatile/Kconfig"
  925. source "arch/arm/mach-vt8500/Kconfig"
  926. source "arch/arm/mach-w90x900/Kconfig"
  927. # Definitions to make life easier
  928. config ARCH_ACORN
  929. bool
  930. config PLAT_IOP
  931. bool
  932. select GENERIC_CLOCKEVENTS
  933. select HAVE_SCHED_CLOCK
  934. config PLAT_ORION
  935. bool
  936. select CLKSRC_MMIO
  937. select GENERIC_IRQ_CHIP
  938. select HAVE_SCHED_CLOCK
  939. config PLAT_PXA
  940. bool
  941. config PLAT_VERSATILE
  942. bool
  943. config ARM_TIMER_SP804
  944. bool
  945. select CLKSRC_MMIO
  946. source arch/arm/mm/Kconfig
  947. config IWMMXT
  948. bool "Enable iWMMXt support"
  949. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  950. default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
  951. help
  952. Enable support for iWMMXt context switching at run time if
  953. running on a CPU that supports it.
  954. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  955. config XSCALE_PMU
  956. bool
  957. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  958. default y
  959. config CPU_HAS_PMU
  960. depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
  961. (!ARCH_OMAP3 || OMAP3_EMU)
  962. default y
  963. bool
  964. config MULTI_IRQ_HANDLER
  965. bool
  966. help
  967. Allow each machine to specify it's own IRQ handler at run time.
  968. if !MMU
  969. source "arch/arm/Kconfig-nommu"
  970. endif
  971. config ARM_ERRATA_411920
  972. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  973. depends on CPU_V6 || CPU_V6K
  974. help
  975. Invalidation of the Instruction Cache operation can
  976. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  977. It does not affect the MPCore. This option enables the ARM Ltd.
  978. recommended workaround.
  979. config ARM_ERRATA_430973
  980. bool "ARM errata: Stale prediction on replaced interworking branch"
  981. depends on CPU_V7
  982. help
  983. This option enables the workaround for the 430973 Cortex-A8
  984. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  985. interworking branch is replaced with another code sequence at the
  986. same virtual address, whether due to self-modifying code or virtual
  987. to physical address re-mapping, Cortex-A8 does not recover from the
  988. stale interworking branch prediction. This results in Cortex-A8
  989. executing the new code sequence in the incorrect ARM or Thumb state.
  990. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  991. and also flushes the branch target cache at every context switch.
  992. Note that setting specific bits in the ACTLR register may not be
  993. available in non-secure mode.
  994. config ARM_ERRATA_458693
  995. bool "ARM errata: Processor deadlock when a false hazard is created"
  996. depends on CPU_V7
  997. help
  998. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  999. erratum. For very specific sequences of memory operations, it is
  1000. possible for a hazard condition intended for a cache line to instead
  1001. be incorrectly associated with a different cache line. This false
  1002. hazard might then cause a processor deadlock. The workaround enables
  1003. the L1 caching of the NEON accesses and disables the PLD instruction
  1004. in the ACTLR register. Note that setting specific bits in the ACTLR
  1005. register may not be available in non-secure mode.
  1006. config ARM_ERRATA_460075
  1007. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  1008. depends on CPU_V7
  1009. help
  1010. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  1011. erratum. Any asynchronous access to the L2 cache may encounter a
  1012. situation in which recent store transactions to the L2 cache are lost
  1013. and overwritten with stale memory contents from external memory. The
  1014. workaround disables the write-allocate mode for the L2 cache via the
  1015. ACTLR register. Note that setting specific bits in the ACTLR register
  1016. may not be available in non-secure mode.
  1017. config ARM_ERRATA_742230
  1018. bool "ARM errata: DMB operation may be faulty"
  1019. depends on CPU_V7 && SMP
  1020. help
  1021. This option enables the workaround for the 742230 Cortex-A9
  1022. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  1023. between two write operations may not ensure the correct visibility
  1024. ordering of the two writes. This workaround sets a specific bit in
  1025. the diagnostic register of the Cortex-A9 which causes the DMB
  1026. instruction to behave as a DSB, ensuring the correct behaviour of
  1027. the two writes.
  1028. config ARM_ERRATA_742231
  1029. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  1030. depends on CPU_V7 && SMP
  1031. help
  1032. This option enables the workaround for the 742231 Cortex-A9
  1033. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  1034. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  1035. accessing some data located in the same cache line, may get corrupted
  1036. data due to bad handling of the address hazard when the line gets
  1037. replaced from one of the CPUs at the same time as another CPU is
  1038. accessing it. This workaround sets specific bits in the diagnostic
  1039. register of the Cortex-A9 which reduces the linefill issuing
  1040. capabilities of the processor.
  1041. config PL310_ERRATA_588369
  1042. bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
  1043. depends on CACHE_L2X0
  1044. help
  1045. The PL310 L2 cache controller implements three types of Clean &
  1046. Invalidate maintenance operations: by Physical Address
  1047. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1048. They are architecturally defined to behave as the execution of a
  1049. clean operation followed immediately by an invalidate operation,
  1050. both performing to the same memory location. This functionality
  1051. is not correctly implemented in PL310 as clean lines are not
  1052. invalidated as a result of these operations.
  1053. config ARM_ERRATA_720789
  1054. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1055. depends on CPU_V7 && SMP
  1056. help
  1057. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1058. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1059. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1060. As a consequence of this erratum, some TLB entries which should be
  1061. invalidated are not, resulting in an incoherency in the system page
  1062. tables. The workaround changes the TLB flushing routines to invalidate
  1063. entries regardless of the ASID.
  1064. config PL310_ERRATA_727915
  1065. bool "Background Clean & Invalidate by Way operation can cause data corruption"
  1066. depends on CACHE_L2X0
  1067. help
  1068. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1069. operation (offset 0x7FC). This operation runs in background so that
  1070. PL310 can handle normal accesses while it is in progress. Under very
  1071. rare circumstances, due to this erratum, write data can be lost when
  1072. PL310 treats a cacheable write transaction during a Clean &
  1073. Invalidate by Way operation.
  1074. config ARM_ERRATA_743622
  1075. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1076. depends on CPU_V7
  1077. help
  1078. This option enables the workaround for the 743622 Cortex-A9
  1079. (r2p0..r2p2) erratum. Under very rare conditions, a faulty
  1080. optimisation in the Cortex-A9 Store Buffer may lead to data
  1081. corruption. This workaround sets a specific bit in the diagnostic
  1082. register of the Cortex-A9 which disables the Store Buffer
  1083. optimisation, preventing the defect from occurring. This has no
  1084. visible impact on the overall performance or power consumption of the
  1085. processor.
  1086. config ARM_ERRATA_751472
  1087. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1088. depends on CPU_V7 && SMP
  1089. help
  1090. This option enables the workaround for the 751472 Cortex-A9 (prior
  1091. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1092. completion of a following broadcasted operation if the second
  1093. operation is received by a CPU before the ICIALLUIS has completed,
  1094. potentially leading to corrupted entries in the cache or TLB.
  1095. config ARM_ERRATA_753970
  1096. bool "ARM errata: cache sync operation may be faulty"
  1097. depends on CACHE_PL310
  1098. help
  1099. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1100. Under some condition the effect of cache sync operation on
  1101. the store buffer still remains when the operation completes.
  1102. This means that the store buffer is always asked to drain and
  1103. this prevents it from merging any further writes. The workaround
  1104. is to replace the normal offset of cache sync operation (0x730)
  1105. by another offset targeting an unmapped PL310 register 0x740.
  1106. This has the same effect as the cache sync operation: store buffer
  1107. drain and waiting for all buffers empty.
  1108. config ARM_ERRATA_754322
  1109. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1110. depends on CPU_V7
  1111. help
  1112. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1113. r3p*) erratum. A speculative memory access may cause a page table walk
  1114. which starts prior to an ASID switch but completes afterwards. This
  1115. can populate the micro-TLB with a stale entry which may be hit with
  1116. the new ASID. This workaround places two dsb instructions in the mm
  1117. switching code so that no page table walks can cross the ASID switch.
  1118. config ARM_ERRATA_754327
  1119. bool "ARM errata: no automatic Store Buffer drain"
  1120. depends on CPU_V7 && SMP
  1121. help
  1122. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1123. r2p0) erratum. The Store Buffer does not have any automatic draining
  1124. mechanism and therefore a livelock may occur if an external agent
  1125. continuously polls a memory location waiting to observe an update.
  1126. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1127. written polling loops from denying visibility of updates to memory.
  1128. config ARM_ERRATA_364296
  1129. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1130. depends on CPU_V6 && !SMP
  1131. help
  1132. This options enables the workaround for the 364296 ARM1136
  1133. r0p2 erratum (possible cache data corruption with
  1134. hit-under-miss enabled). It sets the undocumented bit 31 in
  1135. the auxiliary control register and the FI bit in the control
  1136. register, thus disabling hit-under-miss without putting the
  1137. processor into full low interrupt latency mode. ARM11MPCore
  1138. is not affected.
  1139. config ARM_ERRATA_764369
  1140. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1141. depends on CPU_V7 && SMP
  1142. help
  1143. This option enables the workaround for erratum 764369
  1144. affecting Cortex-A9 MPCore with two or more processors (all
  1145. current revisions). Under certain timing circumstances, a data
  1146. cache line maintenance operation by MVA targeting an Inner
  1147. Shareable memory region may fail to proceed up to either the
  1148. Point of Coherency or to the Point of Unification of the
  1149. system. This workaround adds a DSB instruction before the
  1150. relevant cache maintenance functions and sets a specific bit
  1151. in the diagnostic control register of the SCU.
  1152. endmenu
  1153. source "arch/arm/common/Kconfig"
  1154. menu "Bus support"
  1155. config ARM_AMBA
  1156. bool
  1157. config ISA
  1158. bool
  1159. help
  1160. Find out whether you have ISA slots on your motherboard. ISA is the
  1161. name of a bus system, i.e. the way the CPU talks to the other stuff
  1162. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1163. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1164. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1165. # Select ISA DMA controller support
  1166. config ISA_DMA
  1167. bool
  1168. select ISA_DMA_API
  1169. # Select ISA DMA interface
  1170. config ISA_DMA_API
  1171. bool
  1172. config PCI
  1173. bool "PCI support" if MIGHT_HAVE_PCI
  1174. help
  1175. Find out whether you have a PCI motherboard. PCI is the name of a
  1176. bus system, i.e. the way the CPU talks to the other stuff inside
  1177. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1178. VESA. If you have PCI, say Y, otherwise N.
  1179. config PCI_DOMAINS
  1180. bool
  1181. depends on PCI
  1182. config PCI_NANOENGINE
  1183. bool "BSE nanoEngine PCI support"
  1184. depends on SA1100_NANOENGINE
  1185. help
  1186. Enable PCI on the BSE nanoEngine board.
  1187. config PCI_SYSCALL
  1188. def_bool PCI
  1189. # Select the host bridge type
  1190. config PCI_HOST_VIA82C505
  1191. bool
  1192. depends on PCI && ARCH_SHARK
  1193. default y
  1194. config PCI_HOST_ITE8152
  1195. bool
  1196. depends on PCI && MACH_ARMCORE
  1197. default y
  1198. select DMABOUNCE
  1199. source "drivers/pci/Kconfig"
  1200. source "drivers/pcmcia/Kconfig"
  1201. endmenu
  1202. menu "Kernel Features"
  1203. source "kernel/time/Kconfig"
  1204. config SMP
  1205. bool "Symmetric Multi-Processing"
  1206. depends on CPU_V6K || CPU_V7
  1207. depends on GENERIC_CLOCKEVENTS
  1208. depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
  1209. MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
  1210. ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
  1211. ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE || ARCH_HIGHBANK
  1212. select USE_GENERIC_SMP_HELPERS
  1213. select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
  1214. help
  1215. This enables support for systems with more than one CPU. If you have
  1216. a system with only one CPU, like most personal computers, say N. If
  1217. you have a system with more than one CPU, say Y.
  1218. If you say N here, the kernel will run on single and multiprocessor
  1219. machines, but will use only one CPU of a multiprocessor machine. If
  1220. you say Y here, the kernel will run on many, but not all, single
  1221. processor machines. On a single processor machine, the kernel will
  1222. run faster if you say N here.
  1223. See also <file:Documentation/i386/IO-APIC.txt>,
  1224. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1225. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1226. If you don't know what to do here, say N.
  1227. config SMP_ON_UP
  1228. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1229. depends on EXPERIMENTAL
  1230. depends on SMP && !XIP_KERNEL
  1231. default y
  1232. help
  1233. SMP kernels contain instructions which fail on non-SMP processors.
  1234. Enabling this option allows the kernel to modify itself to make
  1235. these instructions safe. Disabling it allows about 1K of space
  1236. savings.
  1237. If you don't know what to do here, say Y.
  1238. config ARM_CPU_TOPOLOGY
  1239. bool "Support cpu topology definition"
  1240. depends on SMP && CPU_V7
  1241. default y
  1242. help
  1243. Support ARM cpu topology definition. The MPIDR register defines
  1244. affinity between processors which is then used to describe the cpu
  1245. topology of an ARM System.
  1246. config SCHED_MC
  1247. bool "Multi-core scheduler support"
  1248. depends on ARM_CPU_TOPOLOGY
  1249. help
  1250. Multi-core scheduler support improves the CPU scheduler's decision
  1251. making when dealing with multi-core CPU chips at a cost of slightly
  1252. increased overhead in some places. If unsure say N here.
  1253. config SCHED_SMT
  1254. bool "SMT scheduler support"
  1255. depends on ARM_CPU_TOPOLOGY
  1256. help
  1257. Improves the CPU scheduler's decision making when dealing with
  1258. MultiThreading at a cost of slightly increased overhead in some
  1259. places. If unsure say N here.
  1260. config HAVE_ARM_SCU
  1261. bool
  1262. help
  1263. This option enables support for the ARM system coherency unit
  1264. config HAVE_ARM_TWD
  1265. bool
  1266. depends on SMP
  1267. select TICK_ONESHOT
  1268. help
  1269. This options enables support for the ARM timer and watchdog unit
  1270. choice
  1271. prompt "Memory split"
  1272. default VMSPLIT_3G
  1273. help
  1274. Select the desired split between kernel and user memory.
  1275. If you are not absolutely sure what you are doing, leave this
  1276. option alone!
  1277. config VMSPLIT_3G
  1278. bool "3G/1G user/kernel split"
  1279. config VMSPLIT_2G
  1280. bool "2G/2G user/kernel split"
  1281. config VMSPLIT_1G
  1282. bool "1G/3G user/kernel split"
  1283. endchoice
  1284. config PAGE_OFFSET
  1285. hex
  1286. default 0x40000000 if VMSPLIT_1G
  1287. default 0x80000000 if VMSPLIT_2G
  1288. default 0xC0000000
  1289. config NR_CPUS
  1290. int "Maximum number of CPUs (2-32)"
  1291. range 2 32
  1292. depends on SMP
  1293. default "4"
  1294. config HOTPLUG_CPU
  1295. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  1296. depends on SMP && HOTPLUG && EXPERIMENTAL
  1297. help
  1298. Say Y here to experiment with turning CPUs off and on. CPUs
  1299. can be controlled through /sys/devices/system/cpu.
  1300. config LOCAL_TIMERS
  1301. bool "Use local timer interrupts"
  1302. depends on SMP
  1303. default y
  1304. select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
  1305. help
  1306. Enable support for local timers on SMP platforms, rather then the
  1307. legacy IPI broadcast method. Local timers allows the system
  1308. accounting to be spread across the timer interval, preventing a
  1309. "thundering herd" at every timer tick.
  1310. source kernel/Kconfig.preempt
  1311. config HZ
  1312. int
  1313. default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
  1314. ARCH_S5PV210 || ARCH_EXYNOS4
  1315. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  1316. default AT91_TIMER_HZ if ARCH_AT91
  1317. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1318. default 100
  1319. config THUMB2_KERNEL
  1320. bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
  1321. depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
  1322. select AEABI
  1323. select ARM_ASM_UNIFIED
  1324. help
  1325. By enabling this option, the kernel will be compiled in
  1326. Thumb-2 mode. A compiler/assembler that understand the unified
  1327. ARM-Thumb syntax is needed.
  1328. If unsure, say N.
  1329. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1330. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1331. depends on THUMB2_KERNEL && MODULES
  1332. default y
  1333. help
  1334. Various binutils versions can resolve Thumb-2 branches to
  1335. locally-defined, preemptible global symbols as short-range "b.n"
  1336. branch instructions.
  1337. This is a problem, because there's no guarantee the final
  1338. destination of the symbol, or any candidate locations for a
  1339. trampoline, are within range of the branch. For this reason, the
  1340. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1341. relocation in modules at all, and it makes little sense to add
  1342. support.
  1343. The symptom is that the kernel fails with an "unsupported
  1344. relocation" error when loading some modules.
  1345. Until fixed tools are available, passing
  1346. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1347. code which hits this problem, at the cost of a bit of extra runtime
  1348. stack usage in some cases.
  1349. The problem is described in more detail at:
  1350. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1351. Only Thumb-2 kernels are affected.
  1352. Unless you are sure your tools don't have this problem, say Y.
  1353. config ARM_ASM_UNIFIED
  1354. bool
  1355. config AEABI
  1356. bool "Use the ARM EABI to compile the kernel"
  1357. help
  1358. This option allows for the kernel to be compiled using the latest
  1359. ARM ABI (aka EABI). This is only useful if you are using a user
  1360. space environment that is also compiled with EABI.
  1361. Since there are major incompatibilities between the legacy ABI and
  1362. EABI, especially with regard to structure member alignment, this
  1363. option also changes the kernel syscall calling convention to
  1364. disambiguate both ABIs and allow for backward compatibility support
  1365. (selected with CONFIG_OABI_COMPAT).
  1366. To use this you need GCC version 4.0.0 or later.
  1367. config OABI_COMPAT
  1368. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1369. depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
  1370. default y
  1371. help
  1372. This option preserves the old syscall interface along with the
  1373. new (ARM EABI) one. It also provides a compatibility layer to
  1374. intercept syscalls that have structure arguments which layout
  1375. in memory differs between the legacy ABI and the new ARM EABI
  1376. (only for non "thumb" binaries). This option adds a tiny
  1377. overhead to all syscalls and produces a slightly larger kernel.
  1378. If you know you'll be using only pure EABI user space then you
  1379. can say N here. If this option is not selected and you attempt
  1380. to execute a legacy ABI binary then the result will be
  1381. UNPREDICTABLE (in fact it can be predicted that it won't work
  1382. at all). If in doubt say Y.
  1383. config ARCH_HAS_HOLES_MEMORYMODEL
  1384. bool
  1385. config ARCH_SPARSEMEM_ENABLE
  1386. bool
  1387. config ARCH_SPARSEMEM_DEFAULT
  1388. def_bool ARCH_SPARSEMEM_ENABLE
  1389. config ARCH_SELECT_MEMORY_MODEL
  1390. def_bool ARCH_SPARSEMEM_ENABLE
  1391. config HAVE_ARCH_PFN_VALID
  1392. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1393. config HIGHMEM
  1394. bool "High Memory Support"
  1395. depends on MMU
  1396. help
  1397. The address space of ARM processors is only 4 Gigabytes large
  1398. and it has to accommodate user address space, kernel address
  1399. space as well as some memory mapped IO. That means that, if you
  1400. have a large amount of physical memory and/or IO, not all of the
  1401. memory can be "permanently mapped" by the kernel. The physical
  1402. memory that is not permanently mapped is called "high memory".
  1403. Depending on the selected kernel/user memory split, minimum
  1404. vmalloc space and actual amount of RAM, you may not need this
  1405. option which should result in a slightly faster kernel.
  1406. If unsure, say n.
  1407. config HIGHPTE
  1408. bool "Allocate 2nd-level pagetables from highmem"
  1409. depends on HIGHMEM
  1410. config HW_PERF_EVENTS
  1411. bool "Enable hardware performance counter support for perf events"
  1412. depends on PERF_EVENTS && CPU_HAS_PMU
  1413. default y
  1414. help
  1415. Enable hardware performance counter support for perf events. If
  1416. disabled, perf events will use software events only.
  1417. source "mm/Kconfig"
  1418. config FORCE_MAX_ZONEORDER
  1419. int "Maximum zone order" if ARCH_SHMOBILE
  1420. range 11 64 if ARCH_SHMOBILE
  1421. default "9" if SA1111
  1422. default "11"
  1423. help
  1424. The kernel memory allocator divides physically contiguous memory
  1425. blocks into "zones", where each zone is a power of two number of
  1426. pages. This option selects the largest power of two that the kernel
  1427. keeps in the memory allocator. If you need to allocate very large
  1428. blocks of physically contiguous memory, then you may need to
  1429. increase this value.
  1430. This config option is actually maximum order plus one. For example,
  1431. a value of 11 means that the largest free memory block is 2^10 pages.
  1432. config LEDS
  1433. bool "Timer and CPU usage LEDs"
  1434. depends on ARCH_CDB89712 || ARCH_EBSA110 || \
  1435. ARCH_EBSA285 || ARCH_INTEGRATOR || \
  1436. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  1437. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  1438. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  1439. ARCH_AT91 || ARCH_DAVINCI || \
  1440. ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
  1441. help
  1442. If you say Y here, the LEDs on your machine will be used
  1443. to provide useful information about your current system status.
  1444. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  1445. be able to select which LEDs are active using the options below. If
  1446. you are compiling a kernel for the EBSA-110 or the LART however, the
  1447. red LED will simply flash regularly to indicate that the system is
  1448. still functional. It is safe to say Y here if you have a CATS
  1449. system, but the driver will do nothing.
  1450. config LEDS_TIMER
  1451. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  1452. OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1453. || MACH_OMAP_PERSEUS2
  1454. depends on LEDS
  1455. depends on !GENERIC_CLOCKEVENTS
  1456. default y if ARCH_EBSA110
  1457. help
  1458. If you say Y here, one of the system LEDs (the green one on the
  1459. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  1460. will flash regularly to indicate that the system is still
  1461. operational. This is mainly useful to kernel hackers who are
  1462. debugging unstable kernels.
  1463. The LART uses the same LED for both Timer LED and CPU usage LED
  1464. functions. You may choose to use both, but the Timer LED function
  1465. will overrule the CPU usage LED.
  1466. config LEDS_CPU
  1467. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  1468. !ARCH_OMAP) \
  1469. || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1470. || MACH_OMAP_PERSEUS2
  1471. depends on LEDS
  1472. help
  1473. If you say Y here, the red LED will be used to give a good real
  1474. time indication of CPU usage, by lighting whenever the idle task
  1475. is not currently executing.
  1476. The LART uses the same LED for both Timer LED and CPU usage LED
  1477. functions. You may choose to use both, but the Timer LED function
  1478. will overrule the CPU usage LED.
  1479. config ALIGNMENT_TRAP
  1480. bool
  1481. depends on CPU_CP15_MMU
  1482. default y if !ARCH_EBSA110
  1483. select HAVE_PROC_CPU if PROC_FS
  1484. help
  1485. ARM processors cannot fetch/store information which is not
  1486. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1487. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1488. fetch/store instructions will be emulated in software if you say
  1489. here, which has a severe performance impact. This is necessary for
  1490. correct operation of some network protocols. With an IP-only
  1491. configuration it is safe to say N, otherwise say Y.
  1492. config UACCESS_WITH_MEMCPY
  1493. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
  1494. depends on MMU && EXPERIMENTAL
  1495. default y if CPU_FEROCEON
  1496. help
  1497. Implement faster copy_to_user and clear_user methods for CPU
  1498. cores where a 8-word STM instruction give significantly higher
  1499. memory write throughput than a sequence of individual 32bit stores.
  1500. A possible side effect is a slight increase in scheduling latency
  1501. between threads sharing the same address space if they invoke
  1502. such copy operations with large buffers.
  1503. However, if the CPU data cache is using a write-allocate mode,
  1504. this option is unlikely to provide any performance gain.
  1505. config SECCOMP
  1506. bool
  1507. prompt "Enable seccomp to safely compute untrusted bytecode"
  1508. ---help---
  1509. This kernel feature is useful for number crunching applications
  1510. that may need to compute untrusted bytecode during their
  1511. execution. By using pipes or other transports made available to
  1512. the process as file descriptors supporting the read/write
  1513. syscalls, it's possible to isolate those applications in
  1514. their own address space using seccomp. Once seccomp is
  1515. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1516. and the task is only allowed to execute a few safe syscalls
  1517. defined by each seccomp mode.
  1518. config CC_STACKPROTECTOR
  1519. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1520. depends on EXPERIMENTAL
  1521. help
  1522. This option turns on the -fstack-protector GCC feature. This
  1523. feature puts, at the beginning of functions, a canary value on
  1524. the stack just before the return address, and validates
  1525. the value just before actually returning. Stack based buffer
  1526. overflows (that need to overwrite this return address) now also
  1527. overwrite the canary, which gets detected and the attack is then
  1528. neutralized via a kernel panic.
  1529. This feature requires gcc version 4.2 or above.
  1530. config DEPRECATED_PARAM_STRUCT
  1531. bool "Provide old way to pass kernel parameters"
  1532. help
  1533. This was deprecated in 2001 and announced to live on for 5 years.
  1534. Some old boot loaders still use this way.
  1535. endmenu
  1536. menu "Boot options"
  1537. config USE_OF
  1538. bool "Flattened Device Tree support"
  1539. select OF
  1540. select OF_EARLY_FLATTREE
  1541. select IRQ_DOMAIN
  1542. help
  1543. Include support for flattened device tree machine descriptions.
  1544. # Compressed boot loader in ROM. Yes, we really want to ask about
  1545. # TEXT and BSS so we preserve their values in the config files.
  1546. config ZBOOT_ROM_TEXT
  1547. hex "Compressed ROM boot loader base address"
  1548. default "0"
  1549. help
  1550. The physical address at which the ROM-able zImage is to be
  1551. placed in the target. Platforms which normally make use of
  1552. ROM-able zImage formats normally set this to a suitable
  1553. value in their defconfig file.
  1554. If ZBOOT_ROM is not enabled, this has no effect.
  1555. config ZBOOT_ROM_BSS
  1556. hex "Compressed ROM boot loader BSS address"
  1557. default "0"
  1558. help
  1559. The base address of an area of read/write memory in the target
  1560. for the ROM-able zImage which must be available while the
  1561. decompressor is running. It must be large enough to hold the
  1562. entire decompressed kernel plus an additional 128 KiB.
  1563. Platforms which normally make use of ROM-able zImage formats
  1564. normally set this to a suitable value in their defconfig file.
  1565. If ZBOOT_ROM is not enabled, this has no effect.
  1566. config ZBOOT_ROM
  1567. bool "Compressed boot loader in ROM/flash"
  1568. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1569. help
  1570. Say Y here if you intend to execute your compressed kernel image
  1571. (zImage) directly from ROM or flash. If unsure, say N.
  1572. choice
  1573. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1574. depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
  1575. default ZBOOT_ROM_NONE
  1576. help
  1577. Include experimental SD/MMC loading code in the ROM-able zImage.
  1578. With this enabled it is possible to write the the ROM-able zImage
  1579. kernel image to an MMC or SD card and boot the kernel straight
  1580. from the reset vector. At reset the processor Mask ROM will load
  1581. the first part of the the ROM-able zImage which in turn loads the
  1582. rest the kernel image to RAM.
  1583. config ZBOOT_ROM_NONE
  1584. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1585. help
  1586. Do not load image from SD or MMC
  1587. config ZBOOT_ROM_MMCIF
  1588. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1589. help
  1590. Load image from MMCIF hardware block.
  1591. config ZBOOT_ROM_SH_MOBILE_SDHI
  1592. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1593. help
  1594. Load image from SDHI hardware block
  1595. endchoice
  1596. config ARM_APPENDED_DTB
  1597. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1598. depends on OF && !ZBOOT_ROM && EXPERIMENTAL
  1599. help
  1600. With this option, the boot code will look for a device tree binary
  1601. (DTB) appended to zImage
  1602. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1603. This is meant as a backward compatibility convenience for those
  1604. systems with a bootloader that can't be upgraded to accommodate
  1605. the documented boot protocol using a device tree.
  1606. Beware that there is very little in terms of protection against
  1607. this option being confused by leftover garbage in memory that might
  1608. look like a DTB header after a reboot if no actual DTB is appended
  1609. to zImage. Do not leave this option active in a production kernel
  1610. if you don't intend to always append a DTB. Proper passing of the
  1611. location into r2 of a bootloader provided DTB is always preferable
  1612. to this option.
  1613. config ARM_ATAG_DTB_COMPAT
  1614. bool "Supplement the appended DTB with traditional ATAG information"
  1615. depends on ARM_APPENDED_DTB
  1616. help
  1617. Some old bootloaders can't be updated to a DTB capable one, yet
  1618. they provide ATAGs with memory configuration, the ramdisk address,
  1619. the kernel cmdline string, etc. Such information is dynamically
  1620. provided by the bootloader and can't always be stored in a static
  1621. DTB. To allow a device tree enabled kernel to be used with such
  1622. bootloaders, this option allows zImage to extract the information
  1623. from the ATAG list and store it at run time into the appended DTB.
  1624. config CMDLINE
  1625. string "Default kernel command string"
  1626. default ""
  1627. help
  1628. On some architectures (EBSA110 and CATS), there is currently no way
  1629. for the boot loader to pass arguments to the kernel. For these
  1630. architectures, you should supply some command-line options at build
  1631. time by entering them here. As a minimum, you should specify the
  1632. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1633. choice
  1634. prompt "Kernel command line type" if CMDLINE != ""
  1635. default CMDLINE_FROM_BOOTLOADER
  1636. config CMDLINE_FROM_BOOTLOADER
  1637. bool "Use bootloader kernel arguments if available"
  1638. help
  1639. Uses the command-line options passed by the boot loader. If
  1640. the boot loader doesn't provide any, the default kernel command
  1641. string provided in CMDLINE will be used.
  1642. config CMDLINE_EXTEND
  1643. bool "Extend bootloader kernel arguments"
  1644. help
  1645. The command-line arguments provided by the boot loader will be
  1646. appended to the default kernel command string.
  1647. config CMDLINE_FORCE
  1648. bool "Always use the default kernel command string"
  1649. help
  1650. Always use the default kernel command string, even if the boot
  1651. loader passes other arguments to the kernel.
  1652. This is useful if you cannot or don't want to change the
  1653. command-line options your boot loader passes to the kernel.
  1654. endchoice
  1655. config XIP_KERNEL
  1656. bool "Kernel Execute-In-Place from ROM"
  1657. depends on !ZBOOT_ROM
  1658. help
  1659. Execute-In-Place allows the kernel to run from non-volatile storage
  1660. directly addressable by the CPU, such as NOR flash. This saves RAM
  1661. space since the text section of the kernel is not loaded from flash
  1662. to RAM. Read-write sections, such as the data section and stack,
  1663. are still copied to RAM. The XIP kernel is not compressed since
  1664. it has to run directly from flash, so it will take more space to
  1665. store it. The flash address used to link the kernel object files,
  1666. and for storing it, is configuration dependent. Therefore, if you
  1667. say Y here, you must know the proper physical address where to
  1668. store the kernel image depending on your own flash memory usage.
  1669. Also note that the make target becomes "make xipImage" rather than
  1670. "make zImage" or "make Image". The final kernel binary to put in
  1671. ROM memory will be arch/arm/boot/xipImage.
  1672. If unsure, say N.
  1673. config XIP_PHYS_ADDR
  1674. hex "XIP Kernel Physical Location"
  1675. depends on XIP_KERNEL
  1676. default "0x00080000"
  1677. help
  1678. This is the physical address in your flash memory the kernel will
  1679. be linked for and stored to. This address is dependent on your
  1680. own flash usage.
  1681. config KEXEC
  1682. bool "Kexec system call (EXPERIMENTAL)"
  1683. depends on EXPERIMENTAL
  1684. help
  1685. kexec is a system call that implements the ability to shutdown your
  1686. current kernel, and to start another kernel. It is like a reboot
  1687. but it is independent of the system firmware. And like a reboot
  1688. you can start any kernel with it, not just Linux.
  1689. It is an ongoing process to be certain the hardware in a machine
  1690. is properly shutdown, so do not be surprised if this code does not
  1691. initially work for you. It may help to enable device hotplugging
  1692. support.
  1693. config ATAGS_PROC
  1694. bool "Export atags in procfs"
  1695. depends on KEXEC
  1696. default y
  1697. help
  1698. Should the atags used to boot the kernel be exported in an "atags"
  1699. file in procfs. Useful with kexec.
  1700. config CRASH_DUMP
  1701. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1702. depends on EXPERIMENTAL
  1703. help
  1704. Generate crash dump after being started by kexec. This should
  1705. be normally only set in special crash dump kernels which are
  1706. loaded in the main kernel with kexec-tools into a specially
  1707. reserved region and then later executed after a crash by
  1708. kdump/kexec. The crash dump kernel must be compiled to a
  1709. memory address not used by the main kernel
  1710. For more details see Documentation/kdump/kdump.txt
  1711. config AUTO_ZRELADDR
  1712. bool "Auto calculation of the decompressed kernel image address"
  1713. depends on !ZBOOT_ROM && !ARCH_U300
  1714. help
  1715. ZRELADDR is the physical address where the decompressed kernel
  1716. image will be placed. If AUTO_ZRELADDR is selected, the address
  1717. will be determined at run-time by masking the current IP with
  1718. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1719. from start of memory.
  1720. endmenu
  1721. menu "CPU Power Management"
  1722. if ARCH_HAS_CPUFREQ
  1723. source "drivers/cpufreq/Kconfig"
  1724. config CPU_FREQ_IMX
  1725. tristate "CPUfreq driver for i.MX CPUs"
  1726. depends on ARCH_MXC && CPU_FREQ
  1727. help
  1728. This enables the CPUfreq driver for i.MX CPUs.
  1729. config CPU_FREQ_SA1100
  1730. bool
  1731. config CPU_FREQ_SA1110
  1732. bool
  1733. config CPU_FREQ_INTEGRATOR
  1734. tristate "CPUfreq driver for ARM Integrator CPUs"
  1735. depends on ARCH_INTEGRATOR && CPU_FREQ
  1736. default y
  1737. help
  1738. This enables the CPUfreq driver for ARM Integrator CPUs.
  1739. For details, take a look at <file:Documentation/cpu-freq>.
  1740. If in doubt, say Y.
  1741. config CPU_FREQ_PXA
  1742. bool
  1743. depends on CPU_FREQ && ARCH_PXA && PXA25x
  1744. default y
  1745. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  1746. config CPU_FREQ_S3C
  1747. bool
  1748. help
  1749. Internal configuration node for common cpufreq on Samsung SoC
  1750. config CPU_FREQ_S3C24XX
  1751. bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
  1752. depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
  1753. select CPU_FREQ_S3C
  1754. help
  1755. This enables the CPUfreq driver for the Samsung S3C24XX family
  1756. of CPUs.
  1757. For details, take a look at <file:Documentation/cpu-freq>.
  1758. If in doubt, say N.
  1759. config CPU_FREQ_S3C24XX_PLL
  1760. bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
  1761. depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
  1762. help
  1763. Compile in support for changing the PLL frequency from the
  1764. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1765. after a frequency change, so by default it is not enabled.
  1766. This also means that the PLL tables for the selected CPU(s) will
  1767. be built which may increase the size of the kernel image.
  1768. config CPU_FREQ_S3C24XX_DEBUG
  1769. bool "Debug CPUfreq Samsung driver core"
  1770. depends on CPU_FREQ_S3C24XX
  1771. help
  1772. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1773. config CPU_FREQ_S3C24XX_IODEBUG
  1774. bool "Debug CPUfreq Samsung driver IO timing"
  1775. depends on CPU_FREQ_S3C24XX
  1776. help
  1777. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1778. config CPU_FREQ_S3C24XX_DEBUGFS
  1779. bool "Export debugfs for CPUFreq"
  1780. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1781. help
  1782. Export status information via debugfs.
  1783. endif
  1784. source "drivers/cpuidle/Kconfig"
  1785. endmenu
  1786. menu "Floating point emulation"
  1787. comment "At least one emulation must be selected"
  1788. config FPE_NWFPE
  1789. bool "NWFPE math emulation"
  1790. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1791. ---help---
  1792. Say Y to include the NWFPE floating point emulator in the kernel.
  1793. This is necessary to run most binaries. Linux does not currently
  1794. support floating point hardware so you need to say Y here even if
  1795. your machine has an FPA or floating point co-processor podule.
  1796. You may say N here if you are going to load the Acorn FPEmulator
  1797. early in the bootup.
  1798. config FPE_NWFPE_XP
  1799. bool "Support extended precision"
  1800. depends on FPE_NWFPE
  1801. help
  1802. Say Y to include 80-bit support in the kernel floating-point
  1803. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1804. Note that gcc does not generate 80-bit operations by default,
  1805. so in most cases this option only enlarges the size of the
  1806. floating point emulator without any good reason.
  1807. You almost surely want to say N here.
  1808. config FPE_FASTFPE
  1809. bool "FastFPE math emulation (EXPERIMENTAL)"
  1810. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  1811. ---help---
  1812. Say Y here to include the FAST floating point emulator in the kernel.
  1813. This is an experimental much faster emulator which now also has full
  1814. precision for the mantissa. It does not support any exceptions.
  1815. It is very simple, and approximately 3-6 times faster than NWFPE.
  1816. It should be sufficient for most programs. It may be not suitable
  1817. for scientific calculations, but you have to check this for yourself.
  1818. If you do not feel you need a faster FP emulation you should better
  1819. choose NWFPE.
  1820. config VFP
  1821. bool "VFP-format floating point maths"
  1822. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1823. help
  1824. Say Y to include VFP support code in the kernel. This is needed
  1825. if your hardware includes a VFP unit.
  1826. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1827. release notes and additional status information.
  1828. Say N if your target does not have VFP hardware.
  1829. config VFPv3
  1830. bool
  1831. depends on VFP
  1832. default y if CPU_V7
  1833. config NEON
  1834. bool "Advanced SIMD (NEON) Extension support"
  1835. depends on VFPv3 && CPU_V7
  1836. help
  1837. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1838. Extension.
  1839. endmenu
  1840. menu "Userspace binary formats"
  1841. source "fs/Kconfig.binfmt"
  1842. config ARTHUR
  1843. tristate "RISC OS personality"
  1844. depends on !AEABI
  1845. help
  1846. Say Y here to include the kernel code necessary if you want to run
  1847. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1848. experimental; if this sounds frightening, say N and sleep in peace.
  1849. You can also say M here to compile this support as a module (which
  1850. will be called arthur).
  1851. endmenu
  1852. menu "Power management options"
  1853. source "kernel/power/Kconfig"
  1854. config ARCH_SUSPEND_POSSIBLE
  1855. depends on !ARCH_S5P64X0 && !ARCH_S5PC100
  1856. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1857. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
  1858. def_bool y
  1859. endmenu
  1860. source "net/Kconfig"
  1861. source "drivers/Kconfig"
  1862. source "fs/Kconfig"
  1863. source "arch/arm/Kconfig.debug"
  1864. source "security/Kconfig"
  1865. source "crypto/Kconfig"
  1866. source "lib/Kconfig"