Kconfig 63 KB

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  1. config ARM
  2. bool
  3. default y
  4. select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  5. select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  6. select ARCH_HAVE_CUSTOM_GPIO_H
  7. select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  8. select ARCH_WANT_IPC_PARSE_VERSION
  9. select BUILDTIME_EXTABLE_SORT if MMU
  10. select CPU_PM if (SUSPEND || CPU_IDLE)
  11. select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
  12. select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
  13. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  14. select GENERIC_IRQ_PROBE
  15. select GENERIC_IRQ_SHOW
  16. select GENERIC_PCI_IOMAP
  17. select GENERIC_SMP_IDLE_THREAD
  18. select GENERIC_IDLE_POLL_SETUP
  19. select GENERIC_STRNCPY_FROM_USER
  20. select GENERIC_STRNLEN_USER
  21. select HARDIRQS_SW_RESEND
  22. select HAVE_AOUT
  23. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  24. select HAVE_ARCH_KGDB
  25. select HAVE_ARCH_SECCOMP_FILTER
  26. select HAVE_ARCH_TRACEHOOK
  27. select HAVE_BPF_JIT
  28. select HAVE_C_RECORDMCOUNT
  29. select HAVE_DEBUG_KMEMLEAK
  30. select HAVE_DMA_API_DEBUG
  31. select HAVE_DMA_ATTRS
  32. select HAVE_DMA_CONTIGUOUS if MMU
  33. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  34. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  35. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  36. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  37. select HAVE_GENERIC_DMA_COHERENT
  38. select HAVE_GENERIC_HARDIRQS
  39. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  40. select HAVE_IDE if PCI || ISA || PCMCIA
  41. select HAVE_IRQ_TIME_ACCOUNTING
  42. select HAVE_KERNEL_GZIP
  43. select HAVE_KERNEL_LZMA
  44. select HAVE_KERNEL_LZO
  45. select HAVE_KERNEL_XZ
  46. select HAVE_KPROBES if !XIP_KERNEL
  47. select HAVE_KRETPROBES if (HAVE_KPROBES)
  48. select HAVE_MEMBLOCK
  49. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  50. select HAVE_PERF_EVENTS
  51. select HAVE_REGS_AND_STACK_ACCESS_API
  52. select HAVE_SYSCALL_TRACEPOINTS
  53. select HAVE_UID16
  54. select KTIME_SCALAR
  55. select PERF_USE_VMALLOC
  56. select RTC_LIB
  57. select SYS_SUPPORTS_APM_EMULATION
  58. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  59. select MODULES_USE_ELF_REL
  60. select CLONE_BACKWARDS
  61. select OLD_SIGSUSPEND3
  62. select OLD_SIGACTION
  63. select HAVE_CONTEXT_TRACKING
  64. help
  65. The ARM series is a line of low-power-consumption RISC chip designs
  66. licensed by ARM Ltd and targeted at embedded applications and
  67. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  68. manufactured, but legacy ARM-based PC hardware remains popular in
  69. Europe. There is an ARM Linux project with a web page at
  70. <http://www.arm.linux.org.uk/>.
  71. config ARM_HAS_SG_CHAIN
  72. bool
  73. config NEED_SG_DMA_LENGTH
  74. bool
  75. config ARM_DMA_USE_IOMMU
  76. bool
  77. select ARM_HAS_SG_CHAIN
  78. select NEED_SG_DMA_LENGTH
  79. if ARM_DMA_USE_IOMMU
  80. config ARM_DMA_IOMMU_ALIGNMENT
  81. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  82. range 4 9
  83. default 8
  84. help
  85. DMA mapping framework by default aligns all buffers to the smallest
  86. PAGE_SIZE order which is greater than or equal to the requested buffer
  87. size. This works well for buffers up to a few hundreds kilobytes, but
  88. for larger buffers it just a waste of address space. Drivers which has
  89. relatively small addressing window (like 64Mib) might run out of
  90. virtual space with just a few allocations.
  91. With this parameter you can specify the maximum PAGE_SIZE order for
  92. DMA IOMMU buffers. Larger buffers will be aligned only to this
  93. specified order. The order is expressed as a power of two multiplied
  94. by the PAGE_SIZE.
  95. endif
  96. config HAVE_PWM
  97. bool
  98. config MIGHT_HAVE_PCI
  99. bool
  100. config SYS_SUPPORTS_APM_EMULATION
  101. bool
  102. config HAVE_TCM
  103. bool
  104. select GENERIC_ALLOCATOR
  105. config HAVE_PROC_CPU
  106. bool
  107. config NO_IOPORT
  108. bool
  109. config EISA
  110. bool
  111. ---help---
  112. The Extended Industry Standard Architecture (EISA) bus was
  113. developed as an open alternative to the IBM MicroChannel bus.
  114. The EISA bus provided some of the features of the IBM MicroChannel
  115. bus while maintaining backward compatibility with cards made for
  116. the older ISA bus. The EISA bus saw limited use between 1988 and
  117. 1995 when it was made obsolete by the PCI bus.
  118. Say Y here if you are building a kernel for an EISA-based machine.
  119. Otherwise, say N.
  120. config SBUS
  121. bool
  122. config STACKTRACE_SUPPORT
  123. bool
  124. default y
  125. config HAVE_LATENCYTOP_SUPPORT
  126. bool
  127. depends on !SMP
  128. default y
  129. config LOCKDEP_SUPPORT
  130. bool
  131. default y
  132. config TRACE_IRQFLAGS_SUPPORT
  133. bool
  134. default y
  135. config RWSEM_GENERIC_SPINLOCK
  136. bool
  137. default y
  138. config RWSEM_XCHGADD_ALGORITHM
  139. bool
  140. config ARCH_HAS_ILOG2_U32
  141. bool
  142. config ARCH_HAS_ILOG2_U64
  143. bool
  144. config ARCH_HAS_CPUFREQ
  145. bool
  146. help
  147. Internal node to signify that the ARCH has CPUFREQ support
  148. and that the relevant menu configurations are displayed for
  149. it.
  150. config GENERIC_HWEIGHT
  151. bool
  152. default y
  153. config GENERIC_CALIBRATE_DELAY
  154. bool
  155. default y
  156. config ARCH_MAY_HAVE_PC_FDC
  157. bool
  158. config ZONE_DMA
  159. bool
  160. config NEED_DMA_MAP_STATE
  161. def_bool y
  162. config ARCH_HAS_DMA_SET_COHERENT_MASK
  163. bool
  164. config GENERIC_ISA_DMA
  165. bool
  166. config FIQ
  167. bool
  168. config NEED_RET_TO_USER
  169. bool
  170. config ARCH_MTD_XIP
  171. bool
  172. config VECTORS_BASE
  173. hex
  174. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  175. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  176. default 0x00000000
  177. help
  178. The base address of exception vectors.
  179. config ARM_PATCH_PHYS_VIRT
  180. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  181. default y
  182. depends on !XIP_KERNEL && MMU
  183. depends on !ARCH_REALVIEW || !SPARSEMEM
  184. help
  185. Patch phys-to-virt and virt-to-phys translation functions at
  186. boot and module load time according to the position of the
  187. kernel in system memory.
  188. This can only be used with non-XIP MMU kernels where the base
  189. of physical memory is at a 16MB boundary.
  190. Only disable this option if you know that you do not require
  191. this feature (eg, building a kernel for a single machine) and
  192. you need to shrink the kernel to the minimal size.
  193. config NEED_MACH_GPIO_H
  194. bool
  195. help
  196. Select this when mach/gpio.h is required to provide special
  197. definitions for this platform. The need for mach/gpio.h should
  198. be avoided when possible.
  199. config NEED_MACH_IO_H
  200. bool
  201. help
  202. Select this when mach/io.h is required to provide special
  203. definitions for this platform. The need for mach/io.h should
  204. be avoided when possible.
  205. config NEED_MACH_MEMORY_H
  206. bool
  207. help
  208. Select this when mach/memory.h is required to provide special
  209. definitions for this platform. The need for mach/memory.h should
  210. be avoided when possible.
  211. config PHYS_OFFSET
  212. hex "Physical address of main memory" if MMU
  213. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  214. default DRAM_BASE if !MMU
  215. help
  216. Please provide the physical address corresponding to the
  217. location of main memory in your system.
  218. config GENERIC_BUG
  219. def_bool y
  220. depends on BUG
  221. source "init/Kconfig"
  222. source "kernel/Kconfig.freezer"
  223. menu "System Type"
  224. config MMU
  225. bool "MMU-based Paged Memory Management Support"
  226. default y
  227. help
  228. Select if you want MMU-based virtualised addressing space
  229. support by paged memory management. If unsure, say 'Y'.
  230. #
  231. # The "ARM system type" choice list is ordered alphabetically by option
  232. # text. Please add new entries in the option alphabetic order.
  233. #
  234. choice
  235. prompt "ARM system type"
  236. default ARCH_VERSATILE if !MMU
  237. default ARCH_MULTIPLATFORM if MMU
  238. config ARCH_MULTIPLATFORM
  239. bool "Allow multiple platforms to be selected"
  240. depends on MMU
  241. select ARM_PATCH_PHYS_VIRT
  242. select AUTO_ZRELADDR
  243. select COMMON_CLK
  244. select MULTI_IRQ_HANDLER
  245. select SPARSE_IRQ
  246. select USE_OF
  247. config ARCH_INTEGRATOR
  248. bool "ARM Ltd. Integrator family"
  249. select ARCH_HAS_CPUFREQ
  250. select ARM_AMBA
  251. select COMMON_CLK
  252. select COMMON_CLK_VERSATILE
  253. select GENERIC_CLOCKEVENTS
  254. select HAVE_TCM
  255. select ICST
  256. select MULTI_IRQ_HANDLER
  257. select NEED_MACH_MEMORY_H
  258. select PLAT_VERSATILE
  259. select SPARSE_IRQ
  260. select VERSATILE_FPGA_IRQ
  261. help
  262. Support for ARM's Integrator platform.
  263. config ARCH_REALVIEW
  264. bool "ARM Ltd. RealView family"
  265. select ARCH_WANT_OPTIONAL_GPIOLIB
  266. select ARM_AMBA
  267. select ARM_TIMER_SP804
  268. select COMMON_CLK
  269. select COMMON_CLK_VERSATILE
  270. select GENERIC_CLOCKEVENTS
  271. select GPIO_PL061 if GPIOLIB
  272. select ICST
  273. select NEED_MACH_MEMORY_H
  274. select PLAT_VERSATILE
  275. select PLAT_VERSATILE_CLCD
  276. help
  277. This enables support for ARM Ltd RealView boards.
  278. config ARCH_VERSATILE
  279. bool "ARM Ltd. Versatile family"
  280. select ARCH_WANT_OPTIONAL_GPIOLIB
  281. select ARM_AMBA
  282. select ARM_TIMER_SP804
  283. select ARM_VIC
  284. select CLKDEV_LOOKUP
  285. select GENERIC_CLOCKEVENTS
  286. select HAVE_MACH_CLKDEV
  287. select ICST
  288. select PLAT_VERSATILE
  289. select PLAT_VERSATILE_CLCD
  290. select PLAT_VERSATILE_CLOCK
  291. select VERSATILE_FPGA_IRQ
  292. help
  293. This enables support for ARM Ltd Versatile board.
  294. config ARCH_AT91
  295. bool "Atmel AT91"
  296. select ARCH_REQUIRE_GPIOLIB
  297. select CLKDEV_LOOKUP
  298. select HAVE_CLK
  299. select IRQ_DOMAIN
  300. select NEED_MACH_GPIO_H
  301. select NEED_MACH_IO_H if PCCARD
  302. select PINCTRL
  303. select PINCTRL_AT91 if USE_OF
  304. help
  305. This enables support for systems based on Atmel
  306. AT91RM9200 and AT91SAM9* processors.
  307. config ARCH_CLPS711X
  308. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  309. select ARCH_REQUIRE_GPIOLIB
  310. select AUTO_ZRELADDR
  311. select CLKDEV_LOOKUP
  312. select COMMON_CLK
  313. select CPU_ARM720T
  314. select GENERIC_CLOCKEVENTS
  315. select MULTI_IRQ_HANDLER
  316. select NEED_MACH_MEMORY_H
  317. select SPARSE_IRQ
  318. help
  319. Support for Cirrus Logic 711x/721x/731x based boards.
  320. config ARCH_GEMINI
  321. bool "Cortina Systems Gemini"
  322. select ARCH_REQUIRE_GPIOLIB
  323. select ARCH_USES_GETTIMEOFFSET
  324. select NEED_MACH_GPIO_H
  325. select CPU_FA526
  326. help
  327. Support for the Cortina Systems Gemini family SoCs
  328. config ARCH_EBSA110
  329. bool "EBSA-110"
  330. select ARCH_USES_GETTIMEOFFSET
  331. select CPU_SA110
  332. select ISA
  333. select NEED_MACH_IO_H
  334. select NEED_MACH_MEMORY_H
  335. select NO_IOPORT
  336. help
  337. This is an evaluation board for the StrongARM processor available
  338. from Digital. It has limited hardware on-board, including an
  339. Ethernet interface, two PCMCIA sockets, two serial ports and a
  340. parallel port.
  341. config ARCH_EP93XX
  342. bool "EP93xx-based"
  343. select ARCH_HAS_HOLES_MEMORYMODEL
  344. select ARCH_REQUIRE_GPIOLIB
  345. select ARCH_USES_GETTIMEOFFSET
  346. select ARM_AMBA
  347. select ARM_VIC
  348. select CLKDEV_LOOKUP
  349. select CPU_ARM920T
  350. select NEED_MACH_MEMORY_H
  351. help
  352. This enables support for the Cirrus EP93xx series of CPUs.
  353. config ARCH_FOOTBRIDGE
  354. bool "FootBridge"
  355. select CPU_SA110
  356. select FOOTBRIDGE
  357. select GENERIC_CLOCKEVENTS
  358. select HAVE_IDE
  359. select NEED_MACH_IO_H if !MMU
  360. select NEED_MACH_MEMORY_H
  361. help
  362. Support for systems based on the DC21285 companion chip
  363. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  364. config ARCH_NETX
  365. bool "Hilscher NetX based"
  366. select ARM_VIC
  367. select CLKSRC_MMIO
  368. select CPU_ARM926T
  369. select GENERIC_CLOCKEVENTS
  370. help
  371. This enables support for systems based on the Hilscher NetX Soc
  372. config ARCH_IOP13XX
  373. bool "IOP13xx-based"
  374. depends on MMU
  375. select ARCH_SUPPORTS_MSI
  376. select CPU_XSC3
  377. select NEED_MACH_MEMORY_H
  378. select NEED_RET_TO_USER
  379. select PCI
  380. select PLAT_IOP
  381. select VMSPLIT_1G
  382. help
  383. Support for Intel's IOP13XX (XScale) family of processors.
  384. config ARCH_IOP32X
  385. bool "IOP32x-based"
  386. depends on MMU
  387. select ARCH_REQUIRE_GPIOLIB
  388. select CPU_XSCALE
  389. select NEED_MACH_GPIO_H
  390. select NEED_RET_TO_USER
  391. select PCI
  392. select PLAT_IOP
  393. help
  394. Support for Intel's 80219 and IOP32X (XScale) family of
  395. processors.
  396. config ARCH_IOP33X
  397. bool "IOP33x-based"
  398. depends on MMU
  399. select ARCH_REQUIRE_GPIOLIB
  400. select CPU_XSCALE
  401. select NEED_MACH_GPIO_H
  402. select NEED_RET_TO_USER
  403. select PCI
  404. select PLAT_IOP
  405. help
  406. Support for Intel's IOP33X (XScale) family of processors.
  407. config ARCH_IXP4XX
  408. bool "IXP4xx-based"
  409. depends on MMU
  410. select ARCH_HAS_DMA_SET_COHERENT_MASK
  411. select ARCH_REQUIRE_GPIOLIB
  412. select CLKSRC_MMIO
  413. select CPU_XSCALE
  414. select DMABOUNCE if PCI
  415. select GENERIC_CLOCKEVENTS
  416. select MIGHT_HAVE_PCI
  417. select NEED_MACH_IO_H
  418. select USB_EHCI_BIG_ENDIAN_MMIO
  419. select USB_EHCI_BIG_ENDIAN_DESC
  420. help
  421. Support for Intel's IXP4XX (XScale) family of processors.
  422. config ARCH_DOVE
  423. bool "Marvell Dove"
  424. select ARCH_REQUIRE_GPIOLIB
  425. select CPU_PJ4
  426. select GENERIC_CLOCKEVENTS
  427. select MIGHT_HAVE_PCI
  428. select PINCTRL
  429. select PINCTRL_DOVE
  430. select PLAT_ORION_LEGACY
  431. select USB_ARCH_HAS_EHCI
  432. select MVEBU_MBUS
  433. help
  434. Support for the Marvell Dove SoC 88AP510
  435. config ARCH_KIRKWOOD
  436. bool "Marvell Kirkwood"
  437. select ARCH_REQUIRE_GPIOLIB
  438. select CPU_FEROCEON
  439. select GENERIC_CLOCKEVENTS
  440. select PCI
  441. select PCI_QUIRKS
  442. select PINCTRL
  443. select PINCTRL_KIRKWOOD
  444. select PLAT_ORION_LEGACY
  445. select MVEBU_MBUS
  446. help
  447. Support for the following Marvell Kirkwood series SoCs:
  448. 88F6180, 88F6192 and 88F6281.
  449. config ARCH_MV78XX0
  450. bool "Marvell MV78xx0"
  451. select ARCH_REQUIRE_GPIOLIB
  452. select CPU_FEROCEON
  453. select GENERIC_CLOCKEVENTS
  454. select PCI
  455. select PLAT_ORION_LEGACY
  456. select MVEBU_MBUS
  457. help
  458. Support for the following Marvell MV78xx0 series SoCs:
  459. MV781x0, MV782x0.
  460. config ARCH_ORION5X
  461. bool "Marvell Orion"
  462. depends on MMU
  463. select ARCH_REQUIRE_GPIOLIB
  464. select CPU_FEROCEON
  465. select GENERIC_CLOCKEVENTS
  466. select PCI
  467. select PLAT_ORION_LEGACY
  468. select MVEBU_MBUS
  469. help
  470. Support for the following Marvell Orion 5x series SoCs:
  471. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  472. Orion-2 (5281), Orion-1-90 (6183).
  473. config ARCH_MMP
  474. bool "Marvell PXA168/910/MMP2"
  475. depends on MMU
  476. select ARCH_REQUIRE_GPIOLIB
  477. select CLKDEV_LOOKUP
  478. select GENERIC_ALLOCATOR
  479. select GENERIC_CLOCKEVENTS
  480. select GPIO_PXA
  481. select IRQ_DOMAIN
  482. select NEED_MACH_GPIO_H
  483. select PINCTRL
  484. select PLAT_PXA
  485. select SPARSE_IRQ
  486. help
  487. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  488. config ARCH_KS8695
  489. bool "Micrel/Kendin KS8695"
  490. select ARCH_REQUIRE_GPIOLIB
  491. select CLKSRC_MMIO
  492. select CPU_ARM922T
  493. select GENERIC_CLOCKEVENTS
  494. select NEED_MACH_MEMORY_H
  495. help
  496. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  497. System-on-Chip devices.
  498. config ARCH_W90X900
  499. bool "Nuvoton W90X900 CPU"
  500. select ARCH_REQUIRE_GPIOLIB
  501. select CLKDEV_LOOKUP
  502. select CLKSRC_MMIO
  503. select CPU_ARM926T
  504. select GENERIC_CLOCKEVENTS
  505. help
  506. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  507. At present, the w90x900 has been renamed nuc900, regarding
  508. the ARM series product line, you can login the following
  509. link address to know more.
  510. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  511. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  512. config ARCH_LPC32XX
  513. bool "NXP LPC32XX"
  514. select ARCH_REQUIRE_GPIOLIB
  515. select ARM_AMBA
  516. select CLKDEV_LOOKUP
  517. select CLKSRC_MMIO
  518. select CPU_ARM926T
  519. select GENERIC_CLOCKEVENTS
  520. select HAVE_IDE
  521. select HAVE_PWM
  522. select USB_ARCH_HAS_OHCI
  523. select USE_OF
  524. help
  525. Support for the NXP LPC32XX family of processors
  526. config ARCH_PXA
  527. bool "PXA2xx/PXA3xx-based"
  528. depends on MMU
  529. select ARCH_HAS_CPUFREQ
  530. select ARCH_MTD_XIP
  531. select ARCH_REQUIRE_GPIOLIB
  532. select ARM_CPU_SUSPEND if PM
  533. select AUTO_ZRELADDR
  534. select CLKDEV_LOOKUP
  535. select CLKSRC_MMIO
  536. select GENERIC_CLOCKEVENTS
  537. select GPIO_PXA
  538. select HAVE_IDE
  539. select MULTI_IRQ_HANDLER
  540. select NEED_MACH_GPIO_H
  541. select PLAT_PXA
  542. select SPARSE_IRQ
  543. help
  544. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  545. config ARCH_MSM
  546. bool "Qualcomm MSM"
  547. select ARCH_REQUIRE_GPIOLIB
  548. select CLKDEV_LOOKUP
  549. select GENERIC_CLOCKEVENTS
  550. select HAVE_CLK
  551. help
  552. Support for Qualcomm MSM/QSD based systems. This runs on the
  553. apps processor of the MSM/QSD and depends on a shared memory
  554. interface to the modem processor which runs the baseband
  555. stack and controls some vital subsystems
  556. (clock and power control, etc).
  557. config ARCH_SHMOBILE
  558. bool "Renesas SH-Mobile / R-Mobile"
  559. select CLKDEV_LOOKUP
  560. select GENERIC_CLOCKEVENTS
  561. select HAVE_ARM_SCU if SMP
  562. select HAVE_ARM_TWD if LOCAL_TIMERS
  563. select HAVE_CLK
  564. select HAVE_MACH_CLKDEV
  565. select HAVE_SMP
  566. select MIGHT_HAVE_CACHE_L2X0
  567. select MULTI_IRQ_HANDLER
  568. select NEED_MACH_MEMORY_H
  569. select NO_IOPORT
  570. select PINCTRL
  571. select PM_GENERIC_DOMAINS if PM
  572. select SPARSE_IRQ
  573. help
  574. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  575. config ARCH_RPC
  576. bool "RiscPC"
  577. select ARCH_ACORN
  578. select ARCH_MAY_HAVE_PC_FDC
  579. select ARCH_SPARSEMEM_ENABLE
  580. select ARCH_USES_GETTIMEOFFSET
  581. select FIQ
  582. select HAVE_IDE
  583. select HAVE_PATA_PLATFORM
  584. select ISA_DMA_API
  585. select NEED_MACH_IO_H
  586. select NEED_MACH_MEMORY_H
  587. select NO_IOPORT
  588. select VIRT_TO_BUS
  589. help
  590. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  591. CD-ROM interface, serial and parallel port, and the floppy drive.
  592. config ARCH_SA1100
  593. bool "SA1100-based"
  594. select ARCH_HAS_CPUFREQ
  595. select ARCH_MTD_XIP
  596. select ARCH_REQUIRE_GPIOLIB
  597. select ARCH_SPARSEMEM_ENABLE
  598. select CLKDEV_LOOKUP
  599. select CLKSRC_MMIO
  600. select CPU_FREQ
  601. select CPU_SA1100
  602. select GENERIC_CLOCKEVENTS
  603. select HAVE_IDE
  604. select ISA
  605. select NEED_MACH_GPIO_H
  606. select NEED_MACH_MEMORY_H
  607. select SPARSE_IRQ
  608. help
  609. Support for StrongARM 11x0 based boards.
  610. config ARCH_S3C24XX
  611. bool "Samsung S3C24XX SoCs"
  612. select ARCH_HAS_CPUFREQ
  613. select ARCH_REQUIRE_GPIOLIB
  614. select CLKDEV_LOOKUP
  615. select CLKSRC_MMIO
  616. select GENERIC_CLOCKEVENTS
  617. select HAVE_CLK
  618. select HAVE_S3C2410_I2C if I2C
  619. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  620. select HAVE_S3C_RTC if RTC_CLASS
  621. select MULTI_IRQ_HANDLER
  622. select NEED_MACH_GPIO_H
  623. select NEED_MACH_IO_H
  624. help
  625. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  626. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  627. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  628. Samsung SMDK2410 development board (and derivatives).
  629. config ARCH_S3C64XX
  630. bool "Samsung S3C64XX"
  631. select ARCH_HAS_CPUFREQ
  632. select ARCH_REQUIRE_GPIOLIB
  633. select ARM_VIC
  634. select CLKDEV_LOOKUP
  635. select CLKSRC_MMIO
  636. select CPU_V6
  637. select GENERIC_CLOCKEVENTS
  638. select HAVE_CLK
  639. select HAVE_S3C2410_I2C if I2C
  640. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  641. select HAVE_TCM
  642. select NEED_MACH_GPIO_H
  643. select NO_IOPORT
  644. select PLAT_SAMSUNG
  645. select S3C_DEV_NAND
  646. select S3C_GPIO_TRACK
  647. select SAMSUNG_CLKSRC
  648. select SAMSUNG_GPIOLIB_4BIT
  649. select SAMSUNG_IRQ_VIC_TIMER
  650. select USB_ARCH_HAS_OHCI
  651. help
  652. Samsung S3C64XX series based systems
  653. config ARCH_S5P64X0
  654. bool "Samsung S5P6440 S5P6450"
  655. select CLKDEV_LOOKUP
  656. select CLKSRC_MMIO
  657. select CPU_V6
  658. select GENERIC_CLOCKEVENTS
  659. select HAVE_CLK
  660. select HAVE_S3C2410_I2C if I2C
  661. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  662. select HAVE_S3C_RTC if RTC_CLASS
  663. select NEED_MACH_GPIO_H
  664. help
  665. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  666. SMDK6450.
  667. config ARCH_S5PC100
  668. bool "Samsung S5PC100"
  669. select ARCH_REQUIRE_GPIOLIB
  670. select CLKDEV_LOOKUP
  671. select CLKSRC_MMIO
  672. select CPU_V7
  673. select GENERIC_CLOCKEVENTS
  674. select HAVE_CLK
  675. select HAVE_S3C2410_I2C if I2C
  676. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  677. select HAVE_S3C_RTC if RTC_CLASS
  678. select NEED_MACH_GPIO_H
  679. help
  680. Samsung S5PC100 series based systems
  681. config ARCH_S5PV210
  682. bool "Samsung S5PV210/S5PC110"
  683. select ARCH_HAS_CPUFREQ
  684. select ARCH_HAS_HOLES_MEMORYMODEL
  685. select ARCH_SPARSEMEM_ENABLE
  686. select CLKDEV_LOOKUP
  687. select CLKSRC_MMIO
  688. select CPU_V7
  689. select GENERIC_CLOCKEVENTS
  690. select HAVE_CLK
  691. select HAVE_S3C2410_I2C if I2C
  692. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  693. select HAVE_S3C_RTC if RTC_CLASS
  694. select NEED_MACH_GPIO_H
  695. select NEED_MACH_MEMORY_H
  696. help
  697. Samsung S5PV210/S5PC110 series based systems
  698. config ARCH_EXYNOS
  699. bool "Samsung EXYNOS"
  700. select ARCH_HAS_CPUFREQ
  701. select ARCH_HAS_HOLES_MEMORYMODEL
  702. select ARCH_SPARSEMEM_ENABLE
  703. select CLKDEV_LOOKUP
  704. select COMMON_CLK
  705. select CPU_V7
  706. select GENERIC_CLOCKEVENTS
  707. select HAVE_CLK
  708. select HAVE_S3C2410_I2C if I2C
  709. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  710. select HAVE_S3C_RTC if RTC_CLASS
  711. select NEED_MACH_GPIO_H
  712. select NEED_MACH_MEMORY_H
  713. help
  714. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  715. config ARCH_SHARK
  716. bool "Shark"
  717. select ARCH_USES_GETTIMEOFFSET
  718. select CPU_SA110
  719. select ISA
  720. select ISA_DMA
  721. select NEED_MACH_MEMORY_H
  722. select PCI
  723. select VIRT_TO_BUS
  724. select ZONE_DMA
  725. help
  726. Support for the StrongARM based Digital DNARD machine, also known
  727. as "Shark" (<http://www.shark-linux.de/shark.html>).
  728. config ARCH_U300
  729. bool "ST-Ericsson U300 Series"
  730. depends on MMU
  731. select ARCH_REQUIRE_GPIOLIB
  732. select ARM_AMBA
  733. select ARM_PATCH_PHYS_VIRT
  734. select ARM_VIC
  735. select CLKDEV_LOOKUP
  736. select CLKSRC_MMIO
  737. select COMMON_CLK
  738. select CPU_ARM926T
  739. select GENERIC_CLOCKEVENTS
  740. select HAVE_TCM
  741. select SPARSE_IRQ
  742. help
  743. Support for ST-Ericsson U300 series mobile platforms.
  744. config ARCH_DAVINCI
  745. bool "TI DaVinci"
  746. select ARCH_HAS_HOLES_MEMORYMODEL
  747. select ARCH_REQUIRE_GPIOLIB
  748. select CLKDEV_LOOKUP
  749. select GENERIC_ALLOCATOR
  750. select GENERIC_CLOCKEVENTS
  751. select GENERIC_IRQ_CHIP
  752. select HAVE_IDE
  753. select NEED_MACH_GPIO_H
  754. select USE_OF
  755. select ZONE_DMA
  756. help
  757. Support for TI's DaVinci platform.
  758. config ARCH_OMAP1
  759. bool "TI OMAP1"
  760. depends on MMU
  761. select ARCH_HAS_CPUFREQ
  762. select ARCH_HAS_HOLES_MEMORYMODEL
  763. select ARCH_OMAP
  764. select ARCH_REQUIRE_GPIOLIB
  765. select CLKDEV_LOOKUP
  766. select CLKSRC_MMIO
  767. select GENERIC_CLOCKEVENTS
  768. select GENERIC_IRQ_CHIP
  769. select HAVE_CLK
  770. select HAVE_IDE
  771. select IRQ_DOMAIN
  772. select NEED_MACH_IO_H if PCCARD
  773. select NEED_MACH_MEMORY_H
  774. help
  775. Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
  776. endchoice
  777. menu "Multiple platform selection"
  778. depends on ARCH_MULTIPLATFORM
  779. comment "CPU Core family selection"
  780. config ARCH_MULTI_V4
  781. bool "ARMv4 based platforms (FA526, StrongARM)"
  782. depends on !ARCH_MULTI_V6_V7
  783. select ARCH_MULTI_V4_V5
  784. config ARCH_MULTI_V4T
  785. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  786. depends on !ARCH_MULTI_V6_V7
  787. select ARCH_MULTI_V4_V5
  788. config ARCH_MULTI_V5
  789. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  790. depends on !ARCH_MULTI_V6_V7
  791. select ARCH_MULTI_V4_V5
  792. config ARCH_MULTI_V4_V5
  793. bool
  794. config ARCH_MULTI_V6
  795. bool "ARMv6 based platforms (ARM11)"
  796. select ARCH_MULTI_V6_V7
  797. select CPU_V6
  798. config ARCH_MULTI_V7
  799. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  800. default y
  801. select ARCH_MULTI_V6_V7
  802. select CPU_V7
  803. config ARCH_MULTI_V6_V7
  804. bool
  805. config ARCH_MULTI_CPU_AUTO
  806. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  807. select ARCH_MULTI_V5
  808. endmenu
  809. #
  810. # This is sorted alphabetically by mach-* pathname. However, plat-*
  811. # Kconfigs may be included either alphabetically (according to the
  812. # plat- suffix) or along side the corresponding mach-* source.
  813. #
  814. source "arch/arm/mach-mvebu/Kconfig"
  815. source "arch/arm/mach-at91/Kconfig"
  816. source "arch/arm/mach-bcm/Kconfig"
  817. source "arch/arm/mach-bcm2835/Kconfig"
  818. source "arch/arm/mach-clps711x/Kconfig"
  819. source "arch/arm/mach-cns3xxx/Kconfig"
  820. source "arch/arm/mach-davinci/Kconfig"
  821. source "arch/arm/mach-dove/Kconfig"
  822. source "arch/arm/mach-ep93xx/Kconfig"
  823. source "arch/arm/mach-footbridge/Kconfig"
  824. source "arch/arm/mach-gemini/Kconfig"
  825. source "arch/arm/mach-highbank/Kconfig"
  826. source "arch/arm/mach-integrator/Kconfig"
  827. source "arch/arm/mach-iop32x/Kconfig"
  828. source "arch/arm/mach-iop33x/Kconfig"
  829. source "arch/arm/mach-iop13xx/Kconfig"
  830. source "arch/arm/mach-ixp4xx/Kconfig"
  831. source "arch/arm/mach-kirkwood/Kconfig"
  832. source "arch/arm/mach-ks8695/Kconfig"
  833. source "arch/arm/mach-msm/Kconfig"
  834. source "arch/arm/mach-mv78xx0/Kconfig"
  835. source "arch/arm/mach-imx/Kconfig"
  836. source "arch/arm/mach-mxs/Kconfig"
  837. source "arch/arm/mach-netx/Kconfig"
  838. source "arch/arm/mach-nomadik/Kconfig"
  839. source "arch/arm/plat-omap/Kconfig"
  840. source "arch/arm/mach-omap1/Kconfig"
  841. source "arch/arm/mach-omap2/Kconfig"
  842. source "arch/arm/mach-orion5x/Kconfig"
  843. source "arch/arm/mach-picoxcell/Kconfig"
  844. source "arch/arm/mach-pxa/Kconfig"
  845. source "arch/arm/plat-pxa/Kconfig"
  846. source "arch/arm/mach-mmp/Kconfig"
  847. source "arch/arm/mach-realview/Kconfig"
  848. source "arch/arm/mach-sa1100/Kconfig"
  849. source "arch/arm/plat-samsung/Kconfig"
  850. source "arch/arm/mach-socfpga/Kconfig"
  851. source "arch/arm/mach-spear/Kconfig"
  852. source "arch/arm/mach-s3c24xx/Kconfig"
  853. if ARCH_S3C64XX
  854. source "arch/arm/mach-s3c64xx/Kconfig"
  855. endif
  856. source "arch/arm/mach-s5p64x0/Kconfig"
  857. source "arch/arm/mach-s5pc100/Kconfig"
  858. source "arch/arm/mach-s5pv210/Kconfig"
  859. source "arch/arm/mach-exynos/Kconfig"
  860. source "arch/arm/mach-shmobile/Kconfig"
  861. source "arch/arm/mach-sunxi/Kconfig"
  862. source "arch/arm/mach-prima2/Kconfig"
  863. source "arch/arm/mach-tegra/Kconfig"
  864. source "arch/arm/mach-u300/Kconfig"
  865. source "arch/arm/mach-ux500/Kconfig"
  866. source "arch/arm/mach-versatile/Kconfig"
  867. source "arch/arm/mach-vexpress/Kconfig"
  868. source "arch/arm/plat-versatile/Kconfig"
  869. source "arch/arm/mach-virt/Kconfig"
  870. source "arch/arm/mach-vt8500/Kconfig"
  871. source "arch/arm/mach-w90x900/Kconfig"
  872. source "arch/arm/mach-zynq/Kconfig"
  873. # Definitions to make life easier
  874. config ARCH_ACORN
  875. bool
  876. config PLAT_IOP
  877. bool
  878. select GENERIC_CLOCKEVENTS
  879. config PLAT_ORION
  880. bool
  881. select CLKSRC_MMIO
  882. select COMMON_CLK
  883. select GENERIC_IRQ_CHIP
  884. select IRQ_DOMAIN
  885. config PLAT_ORION_LEGACY
  886. bool
  887. select PLAT_ORION
  888. config PLAT_PXA
  889. bool
  890. config PLAT_VERSATILE
  891. bool
  892. config ARM_TIMER_SP804
  893. bool
  894. select CLKSRC_MMIO
  895. select CLKSRC_OF if OF
  896. source arch/arm/mm/Kconfig
  897. config ARM_NR_BANKS
  898. int
  899. default 16 if ARCH_EP93XX
  900. default 8
  901. config IWMMXT
  902. bool "Enable iWMMXt support" if !CPU_PJ4
  903. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  904. default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
  905. help
  906. Enable support for iWMMXt context switching at run time if
  907. running on a CPU that supports it.
  908. config XSCALE_PMU
  909. bool
  910. depends on CPU_XSCALE
  911. default y
  912. config MULTI_IRQ_HANDLER
  913. bool
  914. help
  915. Allow each machine to specify it's own IRQ handler at run time.
  916. if !MMU
  917. source "arch/arm/Kconfig-nommu"
  918. endif
  919. config ARM_ERRATA_326103
  920. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  921. depends on CPU_V6
  922. help
  923. Executing a SWP instruction to read-only memory does not set bit 11
  924. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  925. treat the access as a read, preventing a COW from occurring and
  926. causing the faulting task to livelock.
  927. config ARM_ERRATA_411920
  928. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  929. depends on CPU_V6 || CPU_V6K
  930. help
  931. Invalidation of the Instruction Cache operation can
  932. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  933. It does not affect the MPCore. This option enables the ARM Ltd.
  934. recommended workaround.
  935. config ARM_ERRATA_430973
  936. bool "ARM errata: Stale prediction on replaced interworking branch"
  937. depends on CPU_V7
  938. help
  939. This option enables the workaround for the 430973 Cortex-A8
  940. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  941. interworking branch is replaced with another code sequence at the
  942. same virtual address, whether due to self-modifying code or virtual
  943. to physical address re-mapping, Cortex-A8 does not recover from the
  944. stale interworking branch prediction. This results in Cortex-A8
  945. executing the new code sequence in the incorrect ARM or Thumb state.
  946. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  947. and also flushes the branch target cache at every context switch.
  948. Note that setting specific bits in the ACTLR register may not be
  949. available in non-secure mode.
  950. config ARM_ERRATA_458693
  951. bool "ARM errata: Processor deadlock when a false hazard is created"
  952. depends on CPU_V7
  953. depends on !ARCH_MULTIPLATFORM
  954. help
  955. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  956. erratum. For very specific sequences of memory operations, it is
  957. possible for a hazard condition intended for a cache line to instead
  958. be incorrectly associated with a different cache line. This false
  959. hazard might then cause a processor deadlock. The workaround enables
  960. the L1 caching of the NEON accesses and disables the PLD instruction
  961. in the ACTLR register. Note that setting specific bits in the ACTLR
  962. register may not be available in non-secure mode.
  963. config ARM_ERRATA_460075
  964. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  965. depends on CPU_V7
  966. depends on !ARCH_MULTIPLATFORM
  967. help
  968. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  969. erratum. Any asynchronous access to the L2 cache may encounter a
  970. situation in which recent store transactions to the L2 cache are lost
  971. and overwritten with stale memory contents from external memory. The
  972. workaround disables the write-allocate mode for the L2 cache via the
  973. ACTLR register. Note that setting specific bits in the ACTLR register
  974. may not be available in non-secure mode.
  975. config ARM_ERRATA_742230
  976. bool "ARM errata: DMB operation may be faulty"
  977. depends on CPU_V7 && SMP
  978. depends on !ARCH_MULTIPLATFORM
  979. help
  980. This option enables the workaround for the 742230 Cortex-A9
  981. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  982. between two write operations may not ensure the correct visibility
  983. ordering of the two writes. This workaround sets a specific bit in
  984. the diagnostic register of the Cortex-A9 which causes the DMB
  985. instruction to behave as a DSB, ensuring the correct behaviour of
  986. the two writes.
  987. config ARM_ERRATA_742231
  988. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  989. depends on CPU_V7 && SMP
  990. depends on !ARCH_MULTIPLATFORM
  991. help
  992. This option enables the workaround for the 742231 Cortex-A9
  993. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  994. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  995. accessing some data located in the same cache line, may get corrupted
  996. data due to bad handling of the address hazard when the line gets
  997. replaced from one of the CPUs at the same time as another CPU is
  998. accessing it. This workaround sets specific bits in the diagnostic
  999. register of the Cortex-A9 which reduces the linefill issuing
  1000. capabilities of the processor.
  1001. config PL310_ERRATA_588369
  1002. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  1003. depends on CACHE_L2X0
  1004. help
  1005. The PL310 L2 cache controller implements three types of Clean &
  1006. Invalidate maintenance operations: by Physical Address
  1007. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1008. They are architecturally defined to behave as the execution of a
  1009. clean operation followed immediately by an invalidate operation,
  1010. both performing to the same memory location. This functionality
  1011. is not correctly implemented in PL310 as clean lines are not
  1012. invalidated as a result of these operations.
  1013. config ARM_ERRATA_720789
  1014. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1015. depends on CPU_V7
  1016. help
  1017. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1018. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1019. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1020. As a consequence of this erratum, some TLB entries which should be
  1021. invalidated are not, resulting in an incoherency in the system page
  1022. tables. The workaround changes the TLB flushing routines to invalidate
  1023. entries regardless of the ASID.
  1024. config PL310_ERRATA_727915
  1025. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1026. depends on CACHE_L2X0
  1027. help
  1028. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1029. operation (offset 0x7FC). This operation runs in background so that
  1030. PL310 can handle normal accesses while it is in progress. Under very
  1031. rare circumstances, due to this erratum, write data can be lost when
  1032. PL310 treats a cacheable write transaction during a Clean &
  1033. Invalidate by Way operation.
  1034. config ARM_ERRATA_743622
  1035. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1036. depends on CPU_V7
  1037. depends on !ARCH_MULTIPLATFORM
  1038. help
  1039. This option enables the workaround for the 743622 Cortex-A9
  1040. (r2p*) erratum. Under very rare conditions, a faulty
  1041. optimisation in the Cortex-A9 Store Buffer may lead to data
  1042. corruption. This workaround sets a specific bit in the diagnostic
  1043. register of the Cortex-A9 which disables the Store Buffer
  1044. optimisation, preventing the defect from occurring. This has no
  1045. visible impact on the overall performance or power consumption of the
  1046. processor.
  1047. config ARM_ERRATA_751472
  1048. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1049. depends on CPU_V7
  1050. depends on !ARCH_MULTIPLATFORM
  1051. help
  1052. This option enables the workaround for the 751472 Cortex-A9 (prior
  1053. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1054. completion of a following broadcasted operation if the second
  1055. operation is received by a CPU before the ICIALLUIS has completed,
  1056. potentially leading to corrupted entries in the cache or TLB.
  1057. config PL310_ERRATA_753970
  1058. bool "PL310 errata: cache sync operation may be faulty"
  1059. depends on CACHE_PL310
  1060. help
  1061. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1062. Under some condition the effect of cache sync operation on
  1063. the store buffer still remains when the operation completes.
  1064. This means that the store buffer is always asked to drain and
  1065. this prevents it from merging any further writes. The workaround
  1066. is to replace the normal offset of cache sync operation (0x730)
  1067. by another offset targeting an unmapped PL310 register 0x740.
  1068. This has the same effect as the cache sync operation: store buffer
  1069. drain and waiting for all buffers empty.
  1070. config ARM_ERRATA_754322
  1071. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1072. depends on CPU_V7
  1073. help
  1074. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1075. r3p*) erratum. A speculative memory access may cause a page table walk
  1076. which starts prior to an ASID switch but completes afterwards. This
  1077. can populate the micro-TLB with a stale entry which may be hit with
  1078. the new ASID. This workaround places two dsb instructions in the mm
  1079. switching code so that no page table walks can cross the ASID switch.
  1080. config ARM_ERRATA_754327
  1081. bool "ARM errata: no automatic Store Buffer drain"
  1082. depends on CPU_V7 && SMP
  1083. help
  1084. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1085. r2p0) erratum. The Store Buffer does not have any automatic draining
  1086. mechanism and therefore a livelock may occur if an external agent
  1087. continuously polls a memory location waiting to observe an update.
  1088. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1089. written polling loops from denying visibility of updates to memory.
  1090. config ARM_ERRATA_364296
  1091. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1092. depends on CPU_V6 && !SMP
  1093. help
  1094. This options enables the workaround for the 364296 ARM1136
  1095. r0p2 erratum (possible cache data corruption with
  1096. hit-under-miss enabled). It sets the undocumented bit 31 in
  1097. the auxiliary control register and the FI bit in the control
  1098. register, thus disabling hit-under-miss without putting the
  1099. processor into full low interrupt latency mode. ARM11MPCore
  1100. is not affected.
  1101. config ARM_ERRATA_764369
  1102. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1103. depends on CPU_V7 && SMP
  1104. help
  1105. This option enables the workaround for erratum 764369
  1106. affecting Cortex-A9 MPCore with two or more processors (all
  1107. current revisions). Under certain timing circumstances, a data
  1108. cache line maintenance operation by MVA targeting an Inner
  1109. Shareable memory region may fail to proceed up to either the
  1110. Point of Coherency or to the Point of Unification of the
  1111. system. This workaround adds a DSB instruction before the
  1112. relevant cache maintenance functions and sets a specific bit
  1113. in the diagnostic control register of the SCU.
  1114. config PL310_ERRATA_769419
  1115. bool "PL310 errata: no automatic Store Buffer drain"
  1116. depends on CACHE_L2X0
  1117. help
  1118. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1119. not automatically drain. This can cause normal, non-cacheable
  1120. writes to be retained when the memory system is idle, leading
  1121. to suboptimal I/O performance for drivers using coherent DMA.
  1122. This option adds a write barrier to the cpu_idle loop so that,
  1123. on systems with an outer cache, the store buffer is drained
  1124. explicitly.
  1125. config ARM_ERRATA_775420
  1126. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1127. depends on CPU_V7
  1128. help
  1129. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1130. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1131. operation aborts with MMU exception, it might cause the processor
  1132. to deadlock. This workaround puts DSB before executing ISB if
  1133. an abort may occur on cache maintenance.
  1134. config ARM_ERRATA_798181
  1135. bool "ARM errata: TLBI/DSB failure on Cortex-A15"
  1136. depends on CPU_V7 && SMP
  1137. help
  1138. On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
  1139. adequately shooting down all use of the old entries. This
  1140. option enables the Linux kernel workaround for this erratum
  1141. which sends an IPI to the CPUs that are running the same ASID
  1142. as the one being invalidated.
  1143. endmenu
  1144. source "arch/arm/common/Kconfig"
  1145. menu "Bus support"
  1146. config ARM_AMBA
  1147. bool
  1148. config ISA
  1149. bool
  1150. help
  1151. Find out whether you have ISA slots on your motherboard. ISA is the
  1152. name of a bus system, i.e. the way the CPU talks to the other stuff
  1153. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1154. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1155. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1156. # Select ISA DMA controller support
  1157. config ISA_DMA
  1158. bool
  1159. select ISA_DMA_API
  1160. # Select ISA DMA interface
  1161. config ISA_DMA_API
  1162. bool
  1163. config PCI
  1164. bool "PCI support" if MIGHT_HAVE_PCI
  1165. help
  1166. Find out whether you have a PCI motherboard. PCI is the name of a
  1167. bus system, i.e. the way the CPU talks to the other stuff inside
  1168. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1169. VESA. If you have PCI, say Y, otherwise N.
  1170. config PCI_DOMAINS
  1171. bool
  1172. depends on PCI
  1173. config PCI_NANOENGINE
  1174. bool "BSE nanoEngine PCI support"
  1175. depends on SA1100_NANOENGINE
  1176. help
  1177. Enable PCI on the BSE nanoEngine board.
  1178. config PCI_SYSCALL
  1179. def_bool PCI
  1180. # Select the host bridge type
  1181. config PCI_HOST_VIA82C505
  1182. bool
  1183. depends on PCI && ARCH_SHARK
  1184. default y
  1185. config PCI_HOST_ITE8152
  1186. bool
  1187. depends on PCI && MACH_ARMCORE
  1188. default y
  1189. select DMABOUNCE
  1190. source "drivers/pci/Kconfig"
  1191. source "drivers/pcmcia/Kconfig"
  1192. endmenu
  1193. menu "Kernel Features"
  1194. config HAVE_SMP
  1195. bool
  1196. help
  1197. This option should be selected by machines which have an SMP-
  1198. capable CPU.
  1199. The only effect of this option is to make the SMP-related
  1200. options available to the user for configuration.
  1201. config SMP
  1202. bool "Symmetric Multi-Processing"
  1203. depends on CPU_V6K || CPU_V7
  1204. depends on GENERIC_CLOCKEVENTS
  1205. depends on HAVE_SMP
  1206. depends on MMU
  1207. select USE_GENERIC_SMP_HELPERS
  1208. help
  1209. This enables support for systems with more than one CPU. If you have
  1210. a system with only one CPU, like most personal computers, say N. If
  1211. you have a system with more than one CPU, say Y.
  1212. If you say N here, the kernel will run on single and multiprocessor
  1213. machines, but will use only one CPU of a multiprocessor machine. If
  1214. you say Y here, the kernel will run on many, but not all, single
  1215. processor machines. On a single processor machine, the kernel will
  1216. run faster if you say N here.
  1217. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1218. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1219. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1220. If you don't know what to do here, say N.
  1221. config SMP_ON_UP
  1222. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1223. depends on SMP && !XIP_KERNEL
  1224. default y
  1225. help
  1226. SMP kernels contain instructions which fail on non-SMP processors.
  1227. Enabling this option allows the kernel to modify itself to make
  1228. these instructions safe. Disabling it allows about 1K of space
  1229. savings.
  1230. If you don't know what to do here, say Y.
  1231. config ARM_CPU_TOPOLOGY
  1232. bool "Support cpu topology definition"
  1233. depends on SMP && CPU_V7
  1234. default y
  1235. help
  1236. Support ARM cpu topology definition. The MPIDR register defines
  1237. affinity between processors which is then used to describe the cpu
  1238. topology of an ARM System.
  1239. config SCHED_MC
  1240. bool "Multi-core scheduler support"
  1241. depends on ARM_CPU_TOPOLOGY
  1242. help
  1243. Multi-core scheduler support improves the CPU scheduler's decision
  1244. making when dealing with multi-core CPU chips at a cost of slightly
  1245. increased overhead in some places. If unsure say N here.
  1246. config SCHED_SMT
  1247. bool "SMT scheduler support"
  1248. depends on ARM_CPU_TOPOLOGY
  1249. help
  1250. Improves the CPU scheduler's decision making when dealing with
  1251. MultiThreading at a cost of slightly increased overhead in some
  1252. places. If unsure say N here.
  1253. config HAVE_ARM_SCU
  1254. bool
  1255. help
  1256. This option enables support for the ARM system coherency unit
  1257. config HAVE_ARM_ARCH_TIMER
  1258. bool "Architected timer support"
  1259. depends on CPU_V7
  1260. select ARM_ARCH_TIMER
  1261. help
  1262. This option enables support for the ARM architected timer
  1263. config HAVE_ARM_TWD
  1264. bool
  1265. depends on SMP
  1266. select CLKSRC_OF if OF
  1267. help
  1268. This options enables support for the ARM timer and watchdog unit
  1269. config MCPM
  1270. bool "Multi-Cluster Power Management"
  1271. depends on CPU_V7 && SMP
  1272. help
  1273. This option provides the common power management infrastructure
  1274. for (multi-)cluster based systems, such as big.LITTLE based
  1275. systems.
  1276. choice
  1277. prompt "Memory split"
  1278. default VMSPLIT_3G
  1279. help
  1280. Select the desired split between kernel and user memory.
  1281. If you are not absolutely sure what you are doing, leave this
  1282. option alone!
  1283. config VMSPLIT_3G
  1284. bool "3G/1G user/kernel split"
  1285. config VMSPLIT_2G
  1286. bool "2G/2G user/kernel split"
  1287. config VMSPLIT_1G
  1288. bool "1G/3G user/kernel split"
  1289. endchoice
  1290. config PAGE_OFFSET
  1291. hex
  1292. default 0x40000000 if VMSPLIT_1G
  1293. default 0x80000000 if VMSPLIT_2G
  1294. default 0xC0000000
  1295. config NR_CPUS
  1296. int "Maximum number of CPUs (2-32)"
  1297. range 2 32
  1298. depends on SMP
  1299. default "4"
  1300. config HOTPLUG_CPU
  1301. bool "Support for hot-pluggable CPUs"
  1302. depends on SMP && HOTPLUG
  1303. help
  1304. Say Y here to experiment with turning CPUs off and on. CPUs
  1305. can be controlled through /sys/devices/system/cpu.
  1306. config ARM_PSCI
  1307. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1308. depends on CPU_V7
  1309. help
  1310. Say Y here if you want Linux to communicate with system firmware
  1311. implementing the PSCI specification for CPU-centric power
  1312. management operations described in ARM document number ARM DEN
  1313. 0022A ("Power State Coordination Interface System Software on
  1314. ARM processors").
  1315. config LOCAL_TIMERS
  1316. bool "Use local timer interrupts"
  1317. depends on SMP
  1318. default y
  1319. help
  1320. Enable support for local timers on SMP platforms, rather then the
  1321. legacy IPI broadcast method. Local timers allows the system
  1322. accounting to be spread across the timer interval, preventing a
  1323. "thundering herd" at every timer tick.
  1324. # The GPIO number here must be sorted by descending number. In case of
  1325. # a multiplatform kernel, we just want the highest value required by the
  1326. # selected platforms.
  1327. config ARCH_NR_GPIO
  1328. int
  1329. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1330. default 512 if SOC_OMAP5
  1331. default 392 if ARCH_U8500
  1332. default 352 if ARCH_VT8500
  1333. default 288 if ARCH_SUNXI
  1334. default 264 if MACH_H4700
  1335. default 0
  1336. help
  1337. Maximum number of GPIOs in the system.
  1338. If unsure, leave the default value.
  1339. source kernel/Kconfig.preempt
  1340. config HZ
  1341. int
  1342. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1343. ARCH_S5PV210 || ARCH_EXYNOS4
  1344. default AT91_TIMER_HZ if ARCH_AT91
  1345. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1346. default 100
  1347. config SCHED_HRTICK
  1348. def_bool HIGH_RES_TIMERS
  1349. config THUMB2_KERNEL
  1350. bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
  1351. depends on CPU_V7 && !CPU_V6 && !CPU_V6K
  1352. default y if CPU_THUMBONLY
  1353. select AEABI
  1354. select ARM_ASM_UNIFIED
  1355. select ARM_UNWIND
  1356. help
  1357. By enabling this option, the kernel will be compiled in
  1358. Thumb-2 mode. A compiler/assembler that understand the unified
  1359. ARM-Thumb syntax is needed.
  1360. If unsure, say N.
  1361. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1362. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1363. depends on THUMB2_KERNEL && MODULES
  1364. default y
  1365. help
  1366. Various binutils versions can resolve Thumb-2 branches to
  1367. locally-defined, preemptible global symbols as short-range "b.n"
  1368. branch instructions.
  1369. This is a problem, because there's no guarantee the final
  1370. destination of the symbol, or any candidate locations for a
  1371. trampoline, are within range of the branch. For this reason, the
  1372. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1373. relocation in modules at all, and it makes little sense to add
  1374. support.
  1375. The symptom is that the kernel fails with an "unsupported
  1376. relocation" error when loading some modules.
  1377. Until fixed tools are available, passing
  1378. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1379. code which hits this problem, at the cost of a bit of extra runtime
  1380. stack usage in some cases.
  1381. The problem is described in more detail at:
  1382. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1383. Only Thumb-2 kernels are affected.
  1384. Unless you are sure your tools don't have this problem, say Y.
  1385. config ARM_ASM_UNIFIED
  1386. bool
  1387. config AEABI
  1388. bool "Use the ARM EABI to compile the kernel"
  1389. help
  1390. This option allows for the kernel to be compiled using the latest
  1391. ARM ABI (aka EABI). This is only useful if you are using a user
  1392. space environment that is also compiled with EABI.
  1393. Since there are major incompatibilities between the legacy ABI and
  1394. EABI, especially with regard to structure member alignment, this
  1395. option also changes the kernel syscall calling convention to
  1396. disambiguate both ABIs and allow for backward compatibility support
  1397. (selected with CONFIG_OABI_COMPAT).
  1398. To use this you need GCC version 4.0.0 or later.
  1399. config OABI_COMPAT
  1400. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1401. depends on AEABI && !THUMB2_KERNEL
  1402. default y
  1403. help
  1404. This option preserves the old syscall interface along with the
  1405. new (ARM EABI) one. It also provides a compatibility layer to
  1406. intercept syscalls that have structure arguments which layout
  1407. in memory differs between the legacy ABI and the new ARM EABI
  1408. (only for non "thumb" binaries). This option adds a tiny
  1409. overhead to all syscalls and produces a slightly larger kernel.
  1410. If you know you'll be using only pure EABI user space then you
  1411. can say N here. If this option is not selected and you attempt
  1412. to execute a legacy ABI binary then the result will be
  1413. UNPREDICTABLE (in fact it can be predicted that it won't work
  1414. at all). If in doubt say Y.
  1415. config ARCH_HAS_HOLES_MEMORYMODEL
  1416. bool
  1417. config ARCH_SPARSEMEM_ENABLE
  1418. bool
  1419. config ARCH_SPARSEMEM_DEFAULT
  1420. def_bool ARCH_SPARSEMEM_ENABLE
  1421. config ARCH_SELECT_MEMORY_MODEL
  1422. def_bool ARCH_SPARSEMEM_ENABLE
  1423. config HAVE_ARCH_PFN_VALID
  1424. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1425. config HIGHMEM
  1426. bool "High Memory Support"
  1427. depends on MMU
  1428. help
  1429. The address space of ARM processors is only 4 Gigabytes large
  1430. and it has to accommodate user address space, kernel address
  1431. space as well as some memory mapped IO. That means that, if you
  1432. have a large amount of physical memory and/or IO, not all of the
  1433. memory can be "permanently mapped" by the kernel. The physical
  1434. memory that is not permanently mapped is called "high memory".
  1435. Depending on the selected kernel/user memory split, minimum
  1436. vmalloc space and actual amount of RAM, you may not need this
  1437. option which should result in a slightly faster kernel.
  1438. If unsure, say n.
  1439. config HIGHPTE
  1440. bool "Allocate 2nd-level pagetables from highmem"
  1441. depends on HIGHMEM
  1442. config HW_PERF_EVENTS
  1443. bool "Enable hardware performance counter support for perf events"
  1444. depends on PERF_EVENTS
  1445. default y
  1446. help
  1447. Enable hardware performance counter support for perf events. If
  1448. disabled, perf events will use software events only.
  1449. source "mm/Kconfig"
  1450. config FORCE_MAX_ZONEORDER
  1451. int "Maximum zone order" if ARCH_SHMOBILE
  1452. range 11 64 if ARCH_SHMOBILE
  1453. default "12" if SOC_AM33XX
  1454. default "9" if SA1111
  1455. default "11"
  1456. help
  1457. The kernel memory allocator divides physically contiguous memory
  1458. blocks into "zones", where each zone is a power of two number of
  1459. pages. This option selects the largest power of two that the kernel
  1460. keeps in the memory allocator. If you need to allocate very large
  1461. blocks of physically contiguous memory, then you may need to
  1462. increase this value.
  1463. This config option is actually maximum order plus one. For example,
  1464. a value of 11 means that the largest free memory block is 2^10 pages.
  1465. config ALIGNMENT_TRAP
  1466. bool
  1467. depends on CPU_CP15_MMU
  1468. default y if !ARCH_EBSA110
  1469. select HAVE_PROC_CPU if PROC_FS
  1470. help
  1471. ARM processors cannot fetch/store information which is not
  1472. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1473. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1474. fetch/store instructions will be emulated in software if you say
  1475. here, which has a severe performance impact. This is necessary for
  1476. correct operation of some network protocols. With an IP-only
  1477. configuration it is safe to say N, otherwise say Y.
  1478. config UACCESS_WITH_MEMCPY
  1479. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1480. depends on MMU
  1481. default y if CPU_FEROCEON
  1482. help
  1483. Implement faster copy_to_user and clear_user methods for CPU
  1484. cores where a 8-word STM instruction give significantly higher
  1485. memory write throughput than a sequence of individual 32bit stores.
  1486. A possible side effect is a slight increase in scheduling latency
  1487. between threads sharing the same address space if they invoke
  1488. such copy operations with large buffers.
  1489. However, if the CPU data cache is using a write-allocate mode,
  1490. this option is unlikely to provide any performance gain.
  1491. config SECCOMP
  1492. bool
  1493. prompt "Enable seccomp to safely compute untrusted bytecode"
  1494. ---help---
  1495. This kernel feature is useful for number crunching applications
  1496. that may need to compute untrusted bytecode during their
  1497. execution. By using pipes or other transports made available to
  1498. the process as file descriptors supporting the read/write
  1499. syscalls, it's possible to isolate those applications in
  1500. their own address space using seccomp. Once seccomp is
  1501. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1502. and the task is only allowed to execute a few safe syscalls
  1503. defined by each seccomp mode.
  1504. config CC_STACKPROTECTOR
  1505. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1506. help
  1507. This option turns on the -fstack-protector GCC feature. This
  1508. feature puts, at the beginning of functions, a canary value on
  1509. the stack just before the return address, and validates
  1510. the value just before actually returning. Stack based buffer
  1511. overflows (that need to overwrite this return address) now also
  1512. overwrite the canary, which gets detected and the attack is then
  1513. neutralized via a kernel panic.
  1514. This feature requires gcc version 4.2 or above.
  1515. config XEN_DOM0
  1516. def_bool y
  1517. depends on XEN
  1518. config XEN
  1519. bool "Xen guest support on ARM (EXPERIMENTAL)"
  1520. depends on ARM && AEABI && OF
  1521. depends on CPU_V7 && !CPU_V6
  1522. depends on !GENERIC_ATOMIC64
  1523. select ARM_PSCI
  1524. help
  1525. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1526. endmenu
  1527. menu "Boot options"
  1528. config USE_OF
  1529. bool "Flattened Device Tree support"
  1530. select IRQ_DOMAIN
  1531. select OF
  1532. select OF_EARLY_FLATTREE
  1533. help
  1534. Include support for flattened device tree machine descriptions.
  1535. config ATAGS
  1536. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1537. default y
  1538. help
  1539. This is the traditional way of passing data to the kernel at boot
  1540. time. If you are solely relying on the flattened device tree (or
  1541. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1542. to remove ATAGS support from your kernel binary. If unsure,
  1543. leave this to y.
  1544. config DEPRECATED_PARAM_STRUCT
  1545. bool "Provide old way to pass kernel parameters"
  1546. depends on ATAGS
  1547. help
  1548. This was deprecated in 2001 and announced to live on for 5 years.
  1549. Some old boot loaders still use this way.
  1550. # Compressed boot loader in ROM. Yes, we really want to ask about
  1551. # TEXT and BSS so we preserve their values in the config files.
  1552. config ZBOOT_ROM_TEXT
  1553. hex "Compressed ROM boot loader base address"
  1554. default "0"
  1555. help
  1556. The physical address at which the ROM-able zImage is to be
  1557. placed in the target. Platforms which normally make use of
  1558. ROM-able zImage formats normally set this to a suitable
  1559. value in their defconfig file.
  1560. If ZBOOT_ROM is not enabled, this has no effect.
  1561. config ZBOOT_ROM_BSS
  1562. hex "Compressed ROM boot loader BSS address"
  1563. default "0"
  1564. help
  1565. The base address of an area of read/write memory in the target
  1566. for the ROM-able zImage which must be available while the
  1567. decompressor is running. It must be large enough to hold the
  1568. entire decompressed kernel plus an additional 128 KiB.
  1569. Platforms which normally make use of ROM-able zImage formats
  1570. normally set this to a suitable value in their defconfig file.
  1571. If ZBOOT_ROM is not enabled, this has no effect.
  1572. config ZBOOT_ROM
  1573. bool "Compressed boot loader in ROM/flash"
  1574. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1575. help
  1576. Say Y here if you intend to execute your compressed kernel image
  1577. (zImage) directly from ROM or flash. If unsure, say N.
  1578. choice
  1579. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1580. depends on ZBOOT_ROM && ARCH_SH7372
  1581. default ZBOOT_ROM_NONE
  1582. help
  1583. Include experimental SD/MMC loading code in the ROM-able zImage.
  1584. With this enabled it is possible to write the ROM-able zImage
  1585. kernel image to an MMC or SD card and boot the kernel straight
  1586. from the reset vector. At reset the processor Mask ROM will load
  1587. the first part of the ROM-able zImage which in turn loads the
  1588. rest the kernel image to RAM.
  1589. config ZBOOT_ROM_NONE
  1590. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1591. help
  1592. Do not load image from SD or MMC
  1593. config ZBOOT_ROM_MMCIF
  1594. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1595. help
  1596. Load image from MMCIF hardware block.
  1597. config ZBOOT_ROM_SH_MOBILE_SDHI
  1598. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1599. help
  1600. Load image from SDHI hardware block
  1601. endchoice
  1602. config ARM_APPENDED_DTB
  1603. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1604. depends on OF && !ZBOOT_ROM
  1605. help
  1606. With this option, the boot code will look for a device tree binary
  1607. (DTB) appended to zImage
  1608. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1609. This is meant as a backward compatibility convenience for those
  1610. systems with a bootloader that can't be upgraded to accommodate
  1611. the documented boot protocol using a device tree.
  1612. Beware that there is very little in terms of protection against
  1613. this option being confused by leftover garbage in memory that might
  1614. look like a DTB header after a reboot if no actual DTB is appended
  1615. to zImage. Do not leave this option active in a production kernel
  1616. if you don't intend to always append a DTB. Proper passing of the
  1617. location into r2 of a bootloader provided DTB is always preferable
  1618. to this option.
  1619. config ARM_ATAG_DTB_COMPAT
  1620. bool "Supplement the appended DTB with traditional ATAG information"
  1621. depends on ARM_APPENDED_DTB
  1622. help
  1623. Some old bootloaders can't be updated to a DTB capable one, yet
  1624. they provide ATAGs with memory configuration, the ramdisk address,
  1625. the kernel cmdline string, etc. Such information is dynamically
  1626. provided by the bootloader and can't always be stored in a static
  1627. DTB. To allow a device tree enabled kernel to be used with such
  1628. bootloaders, this option allows zImage to extract the information
  1629. from the ATAG list and store it at run time into the appended DTB.
  1630. choice
  1631. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1632. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1633. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1634. bool "Use bootloader kernel arguments if available"
  1635. help
  1636. Uses the command-line options passed by the boot loader instead of
  1637. the device tree bootargs property. If the boot loader doesn't provide
  1638. any, the device tree bootargs property will be used.
  1639. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1640. bool "Extend with bootloader kernel arguments"
  1641. help
  1642. The command-line arguments provided by the boot loader will be
  1643. appended to the the device tree bootargs property.
  1644. endchoice
  1645. config CMDLINE
  1646. string "Default kernel command string"
  1647. default ""
  1648. help
  1649. On some architectures (EBSA110 and CATS), there is currently no way
  1650. for the boot loader to pass arguments to the kernel. For these
  1651. architectures, you should supply some command-line options at build
  1652. time by entering them here. As a minimum, you should specify the
  1653. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1654. choice
  1655. prompt "Kernel command line type" if CMDLINE != ""
  1656. default CMDLINE_FROM_BOOTLOADER
  1657. depends on ATAGS
  1658. config CMDLINE_FROM_BOOTLOADER
  1659. bool "Use bootloader kernel arguments if available"
  1660. help
  1661. Uses the command-line options passed by the boot loader. If
  1662. the boot loader doesn't provide any, the default kernel command
  1663. string provided in CMDLINE will be used.
  1664. config CMDLINE_EXTEND
  1665. bool "Extend bootloader kernel arguments"
  1666. help
  1667. The command-line arguments provided by the boot loader will be
  1668. appended to the default kernel command string.
  1669. config CMDLINE_FORCE
  1670. bool "Always use the default kernel command string"
  1671. help
  1672. Always use the default kernel command string, even if the boot
  1673. loader passes other arguments to the kernel.
  1674. This is useful if you cannot or don't want to change the
  1675. command-line options your boot loader passes to the kernel.
  1676. endchoice
  1677. config XIP_KERNEL
  1678. bool "Kernel Execute-In-Place from ROM"
  1679. depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
  1680. help
  1681. Execute-In-Place allows the kernel to run from non-volatile storage
  1682. directly addressable by the CPU, such as NOR flash. This saves RAM
  1683. space since the text section of the kernel is not loaded from flash
  1684. to RAM. Read-write sections, such as the data section and stack,
  1685. are still copied to RAM. The XIP kernel is not compressed since
  1686. it has to run directly from flash, so it will take more space to
  1687. store it. The flash address used to link the kernel object files,
  1688. and for storing it, is configuration dependent. Therefore, if you
  1689. say Y here, you must know the proper physical address where to
  1690. store the kernel image depending on your own flash memory usage.
  1691. Also note that the make target becomes "make xipImage" rather than
  1692. "make zImage" or "make Image". The final kernel binary to put in
  1693. ROM memory will be arch/arm/boot/xipImage.
  1694. If unsure, say N.
  1695. config XIP_PHYS_ADDR
  1696. hex "XIP Kernel Physical Location"
  1697. depends on XIP_KERNEL
  1698. default "0x00080000"
  1699. help
  1700. This is the physical address in your flash memory the kernel will
  1701. be linked for and stored to. This address is dependent on your
  1702. own flash usage.
  1703. config KEXEC
  1704. bool "Kexec system call (EXPERIMENTAL)"
  1705. depends on (!SMP || HOTPLUG_CPU)
  1706. help
  1707. kexec is a system call that implements the ability to shutdown your
  1708. current kernel, and to start another kernel. It is like a reboot
  1709. but it is independent of the system firmware. And like a reboot
  1710. you can start any kernel with it, not just Linux.
  1711. It is an ongoing process to be certain the hardware in a machine
  1712. is properly shutdown, so do not be surprised if this code does not
  1713. initially work for you. It may help to enable device hotplugging
  1714. support.
  1715. config ATAGS_PROC
  1716. bool "Export atags in procfs"
  1717. depends on ATAGS && KEXEC
  1718. default y
  1719. help
  1720. Should the atags used to boot the kernel be exported in an "atags"
  1721. file in procfs. Useful with kexec.
  1722. config CRASH_DUMP
  1723. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1724. help
  1725. Generate crash dump after being started by kexec. This should
  1726. be normally only set in special crash dump kernels which are
  1727. loaded in the main kernel with kexec-tools into a specially
  1728. reserved region and then later executed after a crash by
  1729. kdump/kexec. The crash dump kernel must be compiled to a
  1730. memory address not used by the main kernel
  1731. For more details see Documentation/kdump/kdump.txt
  1732. config AUTO_ZRELADDR
  1733. bool "Auto calculation of the decompressed kernel image address"
  1734. depends on !ZBOOT_ROM && !ARCH_U300
  1735. help
  1736. ZRELADDR is the physical address where the decompressed kernel
  1737. image will be placed. If AUTO_ZRELADDR is selected, the address
  1738. will be determined at run-time by masking the current IP with
  1739. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1740. from start of memory.
  1741. endmenu
  1742. menu "CPU Power Management"
  1743. if ARCH_HAS_CPUFREQ
  1744. source "drivers/cpufreq/Kconfig"
  1745. endif
  1746. source "drivers/cpuidle/Kconfig"
  1747. endmenu
  1748. menu "Floating point emulation"
  1749. comment "At least one emulation must be selected"
  1750. config FPE_NWFPE
  1751. bool "NWFPE math emulation"
  1752. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1753. ---help---
  1754. Say Y to include the NWFPE floating point emulator in the kernel.
  1755. This is necessary to run most binaries. Linux does not currently
  1756. support floating point hardware so you need to say Y here even if
  1757. your machine has an FPA or floating point co-processor podule.
  1758. You may say N here if you are going to load the Acorn FPEmulator
  1759. early in the bootup.
  1760. config FPE_NWFPE_XP
  1761. bool "Support extended precision"
  1762. depends on FPE_NWFPE
  1763. help
  1764. Say Y to include 80-bit support in the kernel floating-point
  1765. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1766. Note that gcc does not generate 80-bit operations by default,
  1767. so in most cases this option only enlarges the size of the
  1768. floating point emulator without any good reason.
  1769. You almost surely want to say N here.
  1770. config FPE_FASTFPE
  1771. bool "FastFPE math emulation (EXPERIMENTAL)"
  1772. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1773. ---help---
  1774. Say Y here to include the FAST floating point emulator in the kernel.
  1775. This is an experimental much faster emulator which now also has full
  1776. precision for the mantissa. It does not support any exceptions.
  1777. It is very simple, and approximately 3-6 times faster than NWFPE.
  1778. It should be sufficient for most programs. It may be not suitable
  1779. for scientific calculations, but you have to check this for yourself.
  1780. If you do not feel you need a faster FP emulation you should better
  1781. choose NWFPE.
  1782. config VFP
  1783. bool "VFP-format floating point maths"
  1784. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1785. help
  1786. Say Y to include VFP support code in the kernel. This is needed
  1787. if your hardware includes a VFP unit.
  1788. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1789. release notes and additional status information.
  1790. Say N if your target does not have VFP hardware.
  1791. config VFPv3
  1792. bool
  1793. depends on VFP
  1794. default y if CPU_V7
  1795. config NEON
  1796. bool "Advanced SIMD (NEON) Extension support"
  1797. depends on VFPv3 && CPU_V7
  1798. help
  1799. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1800. Extension.
  1801. endmenu
  1802. menu "Userspace binary formats"
  1803. source "fs/Kconfig.binfmt"
  1804. config ARTHUR
  1805. tristate "RISC OS personality"
  1806. depends on !AEABI
  1807. help
  1808. Say Y here to include the kernel code necessary if you want to run
  1809. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1810. experimental; if this sounds frightening, say N and sleep in peace.
  1811. You can also say M here to compile this support as a module (which
  1812. will be called arthur).
  1813. endmenu
  1814. menu "Power management options"
  1815. source "kernel/power/Kconfig"
  1816. config ARCH_SUSPEND_POSSIBLE
  1817. depends on !ARCH_S5PC100
  1818. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1819. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1820. def_bool y
  1821. config ARM_CPU_SUSPEND
  1822. def_bool PM_SLEEP
  1823. endmenu
  1824. source "net/Kconfig"
  1825. source "drivers/Kconfig"
  1826. source "fs/Kconfig"
  1827. source "arch/arm/Kconfig.debug"
  1828. source "security/Kconfig"
  1829. source "crypto/Kconfig"
  1830. source "lib/Kconfig"
  1831. source "arch/arm/kvm/Kconfig"