Kconfig 64 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_KERNEL_GZIP
  42. select HAVE_KERNEL_LZMA
  43. select HAVE_KERNEL_LZO
  44. select HAVE_KERNEL_XZ
  45. select HAVE_KPROBES if !XIP_KERNEL
  46. select HAVE_KRETPROBES if (HAVE_KPROBES)
  47. select HAVE_MEMBLOCK
  48. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  49. select HAVE_PERF_EVENTS
  50. select HAVE_REGS_AND_STACK_ACCESS_API
  51. select HAVE_SYSCALL_TRACEPOINTS
  52. select HAVE_UID16
  53. select KTIME_SCALAR
  54. select PERF_USE_VMALLOC
  55. select RTC_LIB
  56. select SYS_SUPPORTS_APM_EMULATION
  57. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  58. select MODULES_USE_ELF_REL
  59. select CLONE_BACKWARDS
  60. select OLD_SIGSUSPEND3
  61. select OLD_SIGACTION
  62. select HAVE_CONTEXT_TRACKING
  63. help
  64. The ARM series is a line of low-power-consumption RISC chip designs
  65. licensed by ARM Ltd and targeted at embedded applications and
  66. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  67. manufactured, but legacy ARM-based PC hardware remains popular in
  68. Europe. There is an ARM Linux project with a web page at
  69. <http://www.arm.linux.org.uk/>.
  70. config ARM_HAS_SG_CHAIN
  71. bool
  72. config NEED_SG_DMA_LENGTH
  73. bool
  74. config ARM_DMA_USE_IOMMU
  75. bool
  76. select ARM_HAS_SG_CHAIN
  77. select NEED_SG_DMA_LENGTH
  78. if ARM_DMA_USE_IOMMU
  79. config ARM_DMA_IOMMU_ALIGNMENT
  80. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  81. range 4 9
  82. default 8
  83. help
  84. DMA mapping framework by default aligns all buffers to the smallest
  85. PAGE_SIZE order which is greater than or equal to the requested buffer
  86. size. This works well for buffers up to a few hundreds kilobytes, but
  87. for larger buffers it just a waste of address space. Drivers which has
  88. relatively small addressing window (like 64Mib) might run out of
  89. virtual space with just a few allocations.
  90. With this parameter you can specify the maximum PAGE_SIZE order for
  91. DMA IOMMU buffers. Larger buffers will be aligned only to this
  92. specified order. The order is expressed as a power of two multiplied
  93. by the PAGE_SIZE.
  94. endif
  95. config HAVE_PWM
  96. bool
  97. config MIGHT_HAVE_PCI
  98. bool
  99. config SYS_SUPPORTS_APM_EMULATION
  100. bool
  101. config HAVE_TCM
  102. bool
  103. select GENERIC_ALLOCATOR
  104. config HAVE_PROC_CPU
  105. bool
  106. config NO_IOPORT
  107. bool
  108. config EISA
  109. bool
  110. ---help---
  111. The Extended Industry Standard Architecture (EISA) bus was
  112. developed as an open alternative to the IBM MicroChannel bus.
  113. The EISA bus provided some of the features of the IBM MicroChannel
  114. bus while maintaining backward compatibility with cards made for
  115. the older ISA bus. The EISA bus saw limited use between 1988 and
  116. 1995 when it was made obsolete by the PCI bus.
  117. Say Y here if you are building a kernel for an EISA-based machine.
  118. Otherwise, say N.
  119. config SBUS
  120. bool
  121. config STACKTRACE_SUPPORT
  122. bool
  123. default y
  124. config HAVE_LATENCYTOP_SUPPORT
  125. bool
  126. depends on !SMP
  127. default y
  128. config LOCKDEP_SUPPORT
  129. bool
  130. default y
  131. config TRACE_IRQFLAGS_SUPPORT
  132. bool
  133. default y
  134. config RWSEM_GENERIC_SPINLOCK
  135. bool
  136. default y
  137. config RWSEM_XCHGADD_ALGORITHM
  138. bool
  139. config ARCH_HAS_ILOG2_U32
  140. bool
  141. config ARCH_HAS_ILOG2_U64
  142. bool
  143. config ARCH_HAS_CPUFREQ
  144. bool
  145. help
  146. Internal node to signify that the ARCH has CPUFREQ support
  147. and that the relevant menu configurations are displayed for
  148. it.
  149. config GENERIC_HWEIGHT
  150. bool
  151. default y
  152. config GENERIC_CALIBRATE_DELAY
  153. bool
  154. default y
  155. config ARCH_MAY_HAVE_PC_FDC
  156. bool
  157. config ZONE_DMA
  158. bool
  159. config NEED_DMA_MAP_STATE
  160. def_bool y
  161. config ARCH_HAS_DMA_SET_COHERENT_MASK
  162. bool
  163. config GENERIC_ISA_DMA
  164. bool
  165. config FIQ
  166. bool
  167. config NEED_RET_TO_USER
  168. bool
  169. config ARCH_MTD_XIP
  170. bool
  171. config VECTORS_BASE
  172. hex
  173. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  174. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  175. default 0x00000000
  176. help
  177. The base address of exception vectors.
  178. config ARM_PATCH_PHYS_VIRT
  179. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  180. default y
  181. depends on !XIP_KERNEL && MMU
  182. depends on !ARCH_REALVIEW || !SPARSEMEM
  183. help
  184. Patch phys-to-virt and virt-to-phys translation functions at
  185. boot and module load time according to the position of the
  186. kernel in system memory.
  187. This can only be used with non-XIP MMU kernels where the base
  188. of physical memory is at a 16MB boundary.
  189. Only disable this option if you know that you do not require
  190. this feature (eg, building a kernel for a single machine) and
  191. you need to shrink the kernel to the minimal size.
  192. config NEED_MACH_GPIO_H
  193. bool
  194. help
  195. Select this when mach/gpio.h is required to provide special
  196. definitions for this platform. The need for mach/gpio.h should
  197. be avoided when possible.
  198. config NEED_MACH_IO_H
  199. bool
  200. help
  201. Select this when mach/io.h is required to provide special
  202. definitions for this platform. The need for mach/io.h should
  203. be avoided when possible.
  204. config NEED_MACH_MEMORY_H
  205. bool
  206. help
  207. Select this when mach/memory.h is required to provide special
  208. definitions for this platform. The need for mach/memory.h should
  209. be avoided when possible.
  210. config PHYS_OFFSET
  211. hex "Physical address of main memory" if MMU
  212. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  213. default DRAM_BASE if !MMU
  214. help
  215. Please provide the physical address corresponding to the
  216. location of main memory in your system.
  217. config GENERIC_BUG
  218. def_bool y
  219. depends on BUG
  220. source "init/Kconfig"
  221. source "kernel/Kconfig.freezer"
  222. menu "System Type"
  223. config MMU
  224. bool "MMU-based Paged Memory Management Support"
  225. default y
  226. help
  227. Select if you want MMU-based virtualised addressing space
  228. support by paged memory management. If unsure, say 'Y'.
  229. #
  230. # The "ARM system type" choice list is ordered alphabetically by option
  231. # text. Please add new entries in the option alphabetic order.
  232. #
  233. choice
  234. prompt "ARM system type"
  235. default ARCH_VERSATILE if !MMU
  236. default ARCH_MULTIPLATFORM if MMU
  237. config ARCH_MULTIPLATFORM
  238. bool "Allow multiple platforms to be selected"
  239. depends on MMU
  240. select ARM_PATCH_PHYS_VIRT
  241. select AUTO_ZRELADDR
  242. select COMMON_CLK
  243. select MULTI_IRQ_HANDLER
  244. select SPARSE_IRQ
  245. select USE_OF
  246. config ARCH_INTEGRATOR
  247. bool "ARM Ltd. Integrator family"
  248. select ARCH_HAS_CPUFREQ
  249. select ARM_AMBA
  250. select COMMON_CLK
  251. select COMMON_CLK_VERSATILE
  252. select GENERIC_CLOCKEVENTS
  253. select HAVE_TCM
  254. select ICST
  255. select MULTI_IRQ_HANDLER
  256. select NEED_MACH_MEMORY_H
  257. select PLAT_VERSATILE
  258. select SPARSE_IRQ
  259. select VERSATILE_FPGA_IRQ
  260. help
  261. Support for ARM's Integrator platform.
  262. config ARCH_REALVIEW
  263. bool "ARM Ltd. RealView family"
  264. select ARCH_WANT_OPTIONAL_GPIOLIB
  265. select ARM_AMBA
  266. select ARM_TIMER_SP804
  267. select COMMON_CLK
  268. select COMMON_CLK_VERSATILE
  269. select GENERIC_CLOCKEVENTS
  270. select GPIO_PL061 if GPIOLIB
  271. select ICST
  272. select NEED_MACH_MEMORY_H
  273. select PLAT_VERSATILE
  274. select PLAT_VERSATILE_CLCD
  275. help
  276. This enables support for ARM Ltd RealView boards.
  277. config ARCH_VERSATILE
  278. bool "ARM Ltd. Versatile family"
  279. select ARCH_WANT_OPTIONAL_GPIOLIB
  280. select ARM_AMBA
  281. select ARM_TIMER_SP804
  282. select ARM_VIC
  283. select CLKDEV_LOOKUP
  284. select GENERIC_CLOCKEVENTS
  285. select HAVE_MACH_CLKDEV
  286. select ICST
  287. select PLAT_VERSATILE
  288. select PLAT_VERSATILE_CLCD
  289. select PLAT_VERSATILE_CLOCK
  290. select VERSATILE_FPGA_IRQ
  291. help
  292. This enables support for ARM Ltd Versatile board.
  293. config ARCH_AT91
  294. bool "Atmel AT91"
  295. select ARCH_REQUIRE_GPIOLIB
  296. select CLKDEV_LOOKUP
  297. select HAVE_CLK
  298. select IRQ_DOMAIN
  299. select NEED_MACH_GPIO_H
  300. select NEED_MACH_IO_H if PCCARD
  301. select PINCTRL
  302. select PINCTRL_AT91 if USE_OF
  303. help
  304. This enables support for systems based on Atmel
  305. AT91RM9200 and AT91SAM9* processors.
  306. config ARCH_CLPS711X
  307. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  308. select ARCH_REQUIRE_GPIOLIB
  309. select AUTO_ZRELADDR
  310. select CLKDEV_LOOKUP
  311. select COMMON_CLK
  312. select CPU_ARM720T
  313. select GENERIC_CLOCKEVENTS
  314. select MULTI_IRQ_HANDLER
  315. select NEED_MACH_MEMORY_H
  316. select SPARSE_IRQ
  317. help
  318. Support for Cirrus Logic 711x/721x/731x based boards.
  319. config ARCH_GEMINI
  320. bool "Cortina Systems Gemini"
  321. select ARCH_REQUIRE_GPIOLIB
  322. select ARCH_USES_GETTIMEOFFSET
  323. select NEED_MACH_GPIO_H
  324. select CPU_FA526
  325. help
  326. Support for the Cortina Systems Gemini family SoCs
  327. config ARCH_EBSA110
  328. bool "EBSA-110"
  329. select ARCH_USES_GETTIMEOFFSET
  330. select CPU_SA110
  331. select ISA
  332. select NEED_MACH_IO_H
  333. select NEED_MACH_MEMORY_H
  334. select NO_IOPORT
  335. help
  336. This is an evaluation board for the StrongARM processor available
  337. from Digital. It has limited hardware on-board, including an
  338. Ethernet interface, two PCMCIA sockets, two serial ports and a
  339. parallel port.
  340. config ARCH_EP93XX
  341. bool "EP93xx-based"
  342. select ARCH_HAS_HOLES_MEMORYMODEL
  343. select ARCH_REQUIRE_GPIOLIB
  344. select ARCH_USES_GETTIMEOFFSET
  345. select ARM_AMBA
  346. select ARM_VIC
  347. select CLKDEV_LOOKUP
  348. select CPU_ARM920T
  349. select NEED_MACH_MEMORY_H
  350. help
  351. This enables support for the Cirrus EP93xx series of CPUs.
  352. config ARCH_FOOTBRIDGE
  353. bool "FootBridge"
  354. select CPU_SA110
  355. select FOOTBRIDGE
  356. select GENERIC_CLOCKEVENTS
  357. select HAVE_IDE
  358. select NEED_MACH_IO_H if !MMU
  359. select NEED_MACH_MEMORY_H
  360. help
  361. Support for systems based on the DC21285 companion chip
  362. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  363. config ARCH_NETX
  364. bool "Hilscher NetX based"
  365. select ARM_VIC
  366. select CLKSRC_MMIO
  367. select CPU_ARM926T
  368. select GENERIC_CLOCKEVENTS
  369. help
  370. This enables support for systems based on the Hilscher NetX Soc
  371. config ARCH_IOP13XX
  372. bool "IOP13xx-based"
  373. depends on MMU
  374. select ARCH_SUPPORTS_MSI
  375. select CPU_XSC3
  376. select NEED_MACH_MEMORY_H
  377. select NEED_RET_TO_USER
  378. select PCI
  379. select PLAT_IOP
  380. select VMSPLIT_1G
  381. help
  382. Support for Intel's IOP13XX (XScale) family of processors.
  383. config ARCH_IOP32X
  384. bool "IOP32x-based"
  385. depends on MMU
  386. select ARCH_REQUIRE_GPIOLIB
  387. select CPU_XSCALE
  388. select NEED_MACH_GPIO_H
  389. select NEED_RET_TO_USER
  390. select PCI
  391. select PLAT_IOP
  392. help
  393. Support for Intel's 80219 and IOP32X (XScale) family of
  394. processors.
  395. config ARCH_IOP33X
  396. bool "IOP33x-based"
  397. depends on MMU
  398. select ARCH_REQUIRE_GPIOLIB
  399. select CPU_XSCALE
  400. select NEED_MACH_GPIO_H
  401. select NEED_RET_TO_USER
  402. select PCI
  403. select PLAT_IOP
  404. help
  405. Support for Intel's IOP33X (XScale) family of processors.
  406. config ARCH_IXP4XX
  407. bool "IXP4xx-based"
  408. depends on MMU
  409. select ARCH_HAS_DMA_SET_COHERENT_MASK
  410. select ARCH_REQUIRE_GPIOLIB
  411. select CLKSRC_MMIO
  412. select CPU_XSCALE
  413. select DMABOUNCE if PCI
  414. select GENERIC_CLOCKEVENTS
  415. select MIGHT_HAVE_PCI
  416. select NEED_MACH_IO_H
  417. select USB_EHCI_BIG_ENDIAN_MMIO
  418. select USB_EHCI_BIG_ENDIAN_DESC
  419. help
  420. Support for Intel's IXP4XX (XScale) family of processors.
  421. config ARCH_DOVE
  422. bool "Marvell Dove"
  423. select ARCH_REQUIRE_GPIOLIB
  424. select CPU_V7
  425. select GENERIC_CLOCKEVENTS
  426. select MIGHT_HAVE_PCI
  427. select PINCTRL
  428. select PINCTRL_DOVE
  429. select PLAT_ORION_LEGACY
  430. select USB_ARCH_HAS_EHCI
  431. select MVEBU_MBUS
  432. help
  433. Support for the Marvell Dove SoC 88AP510
  434. config ARCH_KIRKWOOD
  435. bool "Marvell Kirkwood"
  436. select ARCH_REQUIRE_GPIOLIB
  437. select CPU_FEROCEON
  438. select GENERIC_CLOCKEVENTS
  439. select PCI
  440. select PCI_QUIRKS
  441. select PINCTRL
  442. select PINCTRL_KIRKWOOD
  443. select PLAT_ORION_LEGACY
  444. select MVEBU_MBUS
  445. help
  446. Support for the following Marvell Kirkwood series SoCs:
  447. 88F6180, 88F6192 and 88F6281.
  448. config ARCH_MV78XX0
  449. bool "Marvell MV78xx0"
  450. select ARCH_REQUIRE_GPIOLIB
  451. select CPU_FEROCEON
  452. select GENERIC_CLOCKEVENTS
  453. select PCI
  454. select PLAT_ORION_LEGACY
  455. select MVEBU_MBUS
  456. help
  457. Support for the following Marvell MV78xx0 series SoCs:
  458. MV781x0, MV782x0.
  459. config ARCH_ORION5X
  460. bool "Marvell Orion"
  461. depends on MMU
  462. select ARCH_REQUIRE_GPIOLIB
  463. select CPU_FEROCEON
  464. select GENERIC_CLOCKEVENTS
  465. select PCI
  466. select PLAT_ORION_LEGACY
  467. select MVEBU_MBUS
  468. help
  469. Support for the following Marvell Orion 5x series SoCs:
  470. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  471. Orion-2 (5281), Orion-1-90 (6183).
  472. config ARCH_MMP
  473. bool "Marvell PXA168/910/MMP2"
  474. depends on MMU
  475. select ARCH_REQUIRE_GPIOLIB
  476. select CLKDEV_LOOKUP
  477. select GENERIC_ALLOCATOR
  478. select GENERIC_CLOCKEVENTS
  479. select GPIO_PXA
  480. select IRQ_DOMAIN
  481. select NEED_MACH_GPIO_H
  482. select PINCTRL
  483. select PLAT_PXA
  484. select SPARSE_IRQ
  485. help
  486. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  487. config ARCH_KS8695
  488. bool "Micrel/Kendin KS8695"
  489. select ARCH_REQUIRE_GPIOLIB
  490. select CLKSRC_MMIO
  491. select CPU_ARM922T
  492. select GENERIC_CLOCKEVENTS
  493. select NEED_MACH_MEMORY_H
  494. help
  495. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  496. System-on-Chip devices.
  497. config ARCH_W90X900
  498. bool "Nuvoton W90X900 CPU"
  499. select ARCH_REQUIRE_GPIOLIB
  500. select CLKDEV_LOOKUP
  501. select CLKSRC_MMIO
  502. select CPU_ARM926T
  503. select GENERIC_CLOCKEVENTS
  504. help
  505. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  506. At present, the w90x900 has been renamed nuc900, regarding
  507. the ARM series product line, you can login the following
  508. link address to know more.
  509. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  510. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  511. config ARCH_LPC32XX
  512. bool "NXP LPC32XX"
  513. select ARCH_REQUIRE_GPIOLIB
  514. select ARM_AMBA
  515. select CLKDEV_LOOKUP
  516. select CLKSRC_MMIO
  517. select CPU_ARM926T
  518. select GENERIC_CLOCKEVENTS
  519. select HAVE_IDE
  520. select HAVE_PWM
  521. select USB_ARCH_HAS_OHCI
  522. select USE_OF
  523. help
  524. Support for the NXP LPC32XX family of processors
  525. config ARCH_PXA
  526. bool "PXA2xx/PXA3xx-based"
  527. depends on MMU
  528. select ARCH_HAS_CPUFREQ
  529. select ARCH_MTD_XIP
  530. select ARCH_REQUIRE_GPIOLIB
  531. select ARM_CPU_SUSPEND if PM
  532. select AUTO_ZRELADDR
  533. select CLKDEV_LOOKUP
  534. select CLKSRC_MMIO
  535. select GENERIC_CLOCKEVENTS
  536. select GPIO_PXA
  537. select HAVE_IDE
  538. select MULTI_IRQ_HANDLER
  539. select NEED_MACH_GPIO_H
  540. select PLAT_PXA
  541. select SPARSE_IRQ
  542. help
  543. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  544. config ARCH_MSM
  545. bool "Qualcomm MSM"
  546. select ARCH_REQUIRE_GPIOLIB
  547. select CLKDEV_LOOKUP
  548. select GENERIC_CLOCKEVENTS
  549. select HAVE_CLK
  550. help
  551. Support for Qualcomm MSM/QSD based systems. This runs on the
  552. apps processor of the MSM/QSD and depends on a shared memory
  553. interface to the modem processor which runs the baseband
  554. stack and controls some vital subsystems
  555. (clock and power control, etc).
  556. config ARCH_SHMOBILE
  557. bool "Renesas SH-Mobile / R-Mobile"
  558. select CLKDEV_LOOKUP
  559. select GENERIC_CLOCKEVENTS
  560. select HAVE_ARM_SCU if SMP
  561. select HAVE_ARM_TWD if LOCAL_TIMERS
  562. select HAVE_CLK
  563. select HAVE_MACH_CLKDEV
  564. select HAVE_SMP
  565. select MIGHT_HAVE_CACHE_L2X0
  566. select MULTI_IRQ_HANDLER
  567. select NEED_MACH_MEMORY_H
  568. select NO_IOPORT
  569. select PINCTRL if ARCH_WANT_OPTIONAL_GPIOLIB
  570. select PM_GENERIC_DOMAINS if PM
  571. select SPARSE_IRQ
  572. help
  573. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  574. config ARCH_RPC
  575. bool "RiscPC"
  576. select ARCH_ACORN
  577. select ARCH_MAY_HAVE_PC_FDC
  578. select ARCH_SPARSEMEM_ENABLE
  579. select ARCH_USES_GETTIMEOFFSET
  580. select FIQ
  581. select HAVE_IDE
  582. select HAVE_PATA_PLATFORM
  583. select ISA_DMA_API
  584. select NEED_MACH_IO_H
  585. select NEED_MACH_MEMORY_H
  586. select NO_IOPORT
  587. select VIRT_TO_BUS
  588. help
  589. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  590. CD-ROM interface, serial and parallel port, and the floppy drive.
  591. config ARCH_SA1100
  592. bool "SA1100-based"
  593. select ARCH_HAS_CPUFREQ
  594. select ARCH_MTD_XIP
  595. select ARCH_REQUIRE_GPIOLIB
  596. select ARCH_SPARSEMEM_ENABLE
  597. select CLKDEV_LOOKUP
  598. select CLKSRC_MMIO
  599. select CPU_FREQ
  600. select CPU_SA1100
  601. select GENERIC_CLOCKEVENTS
  602. select HAVE_IDE
  603. select ISA
  604. select NEED_MACH_GPIO_H
  605. select NEED_MACH_MEMORY_H
  606. select SPARSE_IRQ
  607. help
  608. Support for StrongARM 11x0 based boards.
  609. config ARCH_S3C24XX
  610. bool "Samsung S3C24XX SoCs"
  611. select ARCH_HAS_CPUFREQ
  612. select ARCH_REQUIRE_GPIOLIB
  613. select CLKDEV_LOOKUP
  614. select CLKSRC_MMIO
  615. select GENERIC_CLOCKEVENTS
  616. select HAVE_CLK
  617. select HAVE_S3C2410_I2C if I2C
  618. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  619. select HAVE_S3C_RTC if RTC_CLASS
  620. select MULTI_IRQ_HANDLER
  621. select NEED_MACH_GPIO_H
  622. select NEED_MACH_IO_H
  623. help
  624. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  625. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  626. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  627. Samsung SMDK2410 development board (and derivatives).
  628. config ARCH_S3C64XX
  629. bool "Samsung S3C64XX"
  630. select ARCH_HAS_CPUFREQ
  631. select ARCH_REQUIRE_GPIOLIB
  632. select ARM_VIC
  633. select CLKDEV_LOOKUP
  634. select CLKSRC_MMIO
  635. select CPU_V6
  636. select GENERIC_CLOCKEVENTS
  637. select HAVE_CLK
  638. select HAVE_S3C2410_I2C if I2C
  639. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  640. select HAVE_TCM
  641. select NEED_MACH_GPIO_H
  642. select NO_IOPORT
  643. select PLAT_SAMSUNG
  644. select S3C_DEV_NAND
  645. select S3C_GPIO_TRACK
  646. select SAMSUNG_CLKSRC
  647. select SAMSUNG_GPIOLIB_4BIT
  648. select SAMSUNG_IRQ_VIC_TIMER
  649. select USB_ARCH_HAS_OHCI
  650. help
  651. Samsung S3C64XX series based systems
  652. config ARCH_S5P64X0
  653. bool "Samsung S5P6440 S5P6450"
  654. select CLKDEV_LOOKUP
  655. select CLKSRC_MMIO
  656. select CPU_V6
  657. select GENERIC_CLOCKEVENTS
  658. select HAVE_CLK
  659. select HAVE_S3C2410_I2C if I2C
  660. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  661. select HAVE_S3C_RTC if RTC_CLASS
  662. select NEED_MACH_GPIO_H
  663. help
  664. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  665. SMDK6450.
  666. config ARCH_S5PC100
  667. bool "Samsung S5PC100"
  668. select ARCH_REQUIRE_GPIOLIB
  669. select CLKDEV_LOOKUP
  670. select CLKSRC_MMIO
  671. select CPU_V7
  672. select GENERIC_CLOCKEVENTS
  673. select HAVE_CLK
  674. select HAVE_S3C2410_I2C if I2C
  675. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  676. select HAVE_S3C_RTC if RTC_CLASS
  677. select NEED_MACH_GPIO_H
  678. help
  679. Samsung S5PC100 series based systems
  680. config ARCH_S5PV210
  681. bool "Samsung S5PV210/S5PC110"
  682. select ARCH_HAS_CPUFREQ
  683. select ARCH_HAS_HOLES_MEMORYMODEL
  684. select ARCH_SPARSEMEM_ENABLE
  685. select CLKDEV_LOOKUP
  686. select CLKSRC_MMIO
  687. select CPU_V7
  688. select GENERIC_CLOCKEVENTS
  689. select HAVE_CLK
  690. select HAVE_S3C2410_I2C if I2C
  691. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  692. select HAVE_S3C_RTC if RTC_CLASS
  693. select NEED_MACH_GPIO_H
  694. select NEED_MACH_MEMORY_H
  695. help
  696. Samsung S5PV210/S5PC110 series based systems
  697. config ARCH_EXYNOS
  698. bool "Samsung EXYNOS"
  699. select ARCH_HAS_CPUFREQ
  700. select ARCH_HAS_HOLES_MEMORYMODEL
  701. select ARCH_SPARSEMEM_ENABLE
  702. select CLKDEV_LOOKUP
  703. select COMMON_CLK
  704. select CPU_V7
  705. select GENERIC_CLOCKEVENTS
  706. select HAVE_CLK
  707. select HAVE_S3C2410_I2C if I2C
  708. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  709. select HAVE_S3C_RTC if RTC_CLASS
  710. select NEED_MACH_GPIO_H
  711. select NEED_MACH_MEMORY_H
  712. help
  713. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  714. config ARCH_SHARK
  715. bool "Shark"
  716. select ARCH_USES_GETTIMEOFFSET
  717. select CPU_SA110
  718. select ISA
  719. select ISA_DMA
  720. select NEED_MACH_MEMORY_H
  721. select PCI
  722. select VIRT_TO_BUS
  723. select ZONE_DMA
  724. help
  725. Support for the StrongARM based Digital DNARD machine, also known
  726. as "Shark" (<http://www.shark-linux.de/shark.html>).
  727. config ARCH_U300
  728. bool "ST-Ericsson U300 Series"
  729. depends on MMU
  730. select ARCH_REQUIRE_GPIOLIB
  731. select ARM_AMBA
  732. select ARM_PATCH_PHYS_VIRT
  733. select ARM_VIC
  734. select CLKDEV_LOOKUP
  735. select CLKSRC_MMIO
  736. select COMMON_CLK
  737. select CPU_ARM926T
  738. select GENERIC_CLOCKEVENTS
  739. select HAVE_TCM
  740. select SPARSE_IRQ
  741. help
  742. Support for ST-Ericsson U300 series mobile platforms.
  743. config ARCH_DAVINCI
  744. bool "TI DaVinci"
  745. select ARCH_HAS_HOLES_MEMORYMODEL
  746. select ARCH_REQUIRE_GPIOLIB
  747. select CLKDEV_LOOKUP
  748. select GENERIC_ALLOCATOR
  749. select GENERIC_CLOCKEVENTS
  750. select GENERIC_IRQ_CHIP
  751. select HAVE_IDE
  752. select NEED_MACH_GPIO_H
  753. select USE_OF
  754. select ZONE_DMA
  755. help
  756. Support for TI's DaVinci platform.
  757. config ARCH_OMAP1
  758. bool "TI OMAP1"
  759. depends on MMU
  760. select ARCH_HAS_CPUFREQ
  761. select ARCH_HAS_HOLES_MEMORYMODEL
  762. select ARCH_OMAP
  763. select ARCH_REQUIRE_GPIOLIB
  764. select CLKDEV_LOOKUP
  765. select CLKSRC_MMIO
  766. select GENERIC_CLOCKEVENTS
  767. select GENERIC_IRQ_CHIP
  768. select HAVE_CLK
  769. select HAVE_IDE
  770. select IRQ_DOMAIN
  771. select NEED_MACH_IO_H if PCCARD
  772. select NEED_MACH_MEMORY_H
  773. help
  774. Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
  775. endchoice
  776. menu "Multiple platform selection"
  777. depends on ARCH_MULTIPLATFORM
  778. comment "CPU Core family selection"
  779. config ARCH_MULTI_V4
  780. bool "ARMv4 based platforms (FA526, StrongARM)"
  781. depends on !ARCH_MULTI_V6_V7
  782. select ARCH_MULTI_V4_V5
  783. config ARCH_MULTI_V4T
  784. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  785. depends on !ARCH_MULTI_V6_V7
  786. select ARCH_MULTI_V4_V5
  787. config ARCH_MULTI_V5
  788. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  789. depends on !ARCH_MULTI_V6_V7
  790. select ARCH_MULTI_V4_V5
  791. config ARCH_MULTI_V4_V5
  792. bool
  793. config ARCH_MULTI_V6
  794. bool "ARMv6 based platforms (ARM11)"
  795. select ARCH_MULTI_V6_V7
  796. select CPU_V6
  797. config ARCH_MULTI_V7
  798. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  799. default y
  800. select ARCH_MULTI_V6_V7
  801. select CPU_V7
  802. config ARCH_MULTI_V6_V7
  803. bool
  804. config ARCH_MULTI_CPU_AUTO
  805. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  806. select ARCH_MULTI_V5
  807. endmenu
  808. #
  809. # This is sorted alphabetically by mach-* pathname. However, plat-*
  810. # Kconfigs may be included either alphabetically (according to the
  811. # plat- suffix) or along side the corresponding mach-* source.
  812. #
  813. source "arch/arm/mach-mvebu/Kconfig"
  814. source "arch/arm/mach-at91/Kconfig"
  815. source "arch/arm/mach-bcm/Kconfig"
  816. source "arch/arm/mach-bcm2835/Kconfig"
  817. source "arch/arm/mach-clps711x/Kconfig"
  818. source "arch/arm/mach-cns3xxx/Kconfig"
  819. source "arch/arm/mach-davinci/Kconfig"
  820. source "arch/arm/mach-dove/Kconfig"
  821. source "arch/arm/mach-ep93xx/Kconfig"
  822. source "arch/arm/mach-footbridge/Kconfig"
  823. source "arch/arm/mach-gemini/Kconfig"
  824. source "arch/arm/mach-highbank/Kconfig"
  825. source "arch/arm/mach-integrator/Kconfig"
  826. source "arch/arm/mach-iop32x/Kconfig"
  827. source "arch/arm/mach-iop33x/Kconfig"
  828. source "arch/arm/mach-iop13xx/Kconfig"
  829. source "arch/arm/mach-ixp4xx/Kconfig"
  830. source "arch/arm/mach-kirkwood/Kconfig"
  831. source "arch/arm/mach-ks8695/Kconfig"
  832. source "arch/arm/mach-msm/Kconfig"
  833. source "arch/arm/mach-mv78xx0/Kconfig"
  834. source "arch/arm/mach-imx/Kconfig"
  835. source "arch/arm/mach-mxs/Kconfig"
  836. source "arch/arm/mach-netx/Kconfig"
  837. source "arch/arm/mach-nomadik/Kconfig"
  838. source "arch/arm/plat-omap/Kconfig"
  839. source "arch/arm/mach-omap1/Kconfig"
  840. source "arch/arm/mach-omap2/Kconfig"
  841. source "arch/arm/mach-orion5x/Kconfig"
  842. source "arch/arm/mach-picoxcell/Kconfig"
  843. source "arch/arm/mach-pxa/Kconfig"
  844. source "arch/arm/plat-pxa/Kconfig"
  845. source "arch/arm/mach-mmp/Kconfig"
  846. source "arch/arm/mach-realview/Kconfig"
  847. source "arch/arm/mach-sa1100/Kconfig"
  848. source "arch/arm/plat-samsung/Kconfig"
  849. source "arch/arm/mach-socfpga/Kconfig"
  850. source "arch/arm/mach-spear/Kconfig"
  851. source "arch/arm/mach-s3c24xx/Kconfig"
  852. if ARCH_S3C64XX
  853. source "arch/arm/mach-s3c64xx/Kconfig"
  854. endif
  855. source "arch/arm/mach-s5p64x0/Kconfig"
  856. source "arch/arm/mach-s5pc100/Kconfig"
  857. source "arch/arm/mach-s5pv210/Kconfig"
  858. source "arch/arm/mach-exynos/Kconfig"
  859. source "arch/arm/mach-shmobile/Kconfig"
  860. source "arch/arm/mach-sunxi/Kconfig"
  861. source "arch/arm/mach-prima2/Kconfig"
  862. source "arch/arm/mach-tegra/Kconfig"
  863. source "arch/arm/mach-u300/Kconfig"
  864. source "arch/arm/mach-ux500/Kconfig"
  865. source "arch/arm/mach-versatile/Kconfig"
  866. source "arch/arm/mach-vexpress/Kconfig"
  867. source "arch/arm/plat-versatile/Kconfig"
  868. source "arch/arm/mach-virt/Kconfig"
  869. source "arch/arm/mach-vt8500/Kconfig"
  870. source "arch/arm/mach-w90x900/Kconfig"
  871. source "arch/arm/mach-zynq/Kconfig"
  872. # Definitions to make life easier
  873. config ARCH_ACORN
  874. bool
  875. config PLAT_IOP
  876. bool
  877. select GENERIC_CLOCKEVENTS
  878. config PLAT_ORION
  879. bool
  880. select CLKSRC_MMIO
  881. select COMMON_CLK
  882. select GENERIC_IRQ_CHIP
  883. select IRQ_DOMAIN
  884. config PLAT_ORION_LEGACY
  885. bool
  886. select PLAT_ORION
  887. config PLAT_PXA
  888. bool
  889. config PLAT_VERSATILE
  890. bool
  891. config ARM_TIMER_SP804
  892. bool
  893. select CLKSRC_MMIO
  894. select CLKSRC_OF if OF
  895. source arch/arm/mm/Kconfig
  896. config ARM_NR_BANKS
  897. int
  898. default 16 if ARCH_EP93XX
  899. default 8
  900. config IWMMXT
  901. bool "Enable iWMMXt support" if !CPU_PJ4
  902. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  903. default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
  904. help
  905. Enable support for iWMMXt context switching at run time if
  906. running on a CPU that supports it.
  907. config XSCALE_PMU
  908. bool
  909. depends on CPU_XSCALE
  910. default y
  911. config MULTI_IRQ_HANDLER
  912. bool
  913. help
  914. Allow each machine to specify it's own IRQ handler at run time.
  915. if !MMU
  916. source "arch/arm/Kconfig-nommu"
  917. endif
  918. config ARM_ERRATA_326103
  919. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  920. depends on CPU_V6
  921. help
  922. Executing a SWP instruction to read-only memory does not set bit 11
  923. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  924. treat the access as a read, preventing a COW from occurring and
  925. causing the faulting task to livelock.
  926. config ARM_ERRATA_411920
  927. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  928. depends on CPU_V6 || CPU_V6K
  929. help
  930. Invalidation of the Instruction Cache operation can
  931. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  932. It does not affect the MPCore. This option enables the ARM Ltd.
  933. recommended workaround.
  934. config ARM_ERRATA_430973
  935. bool "ARM errata: Stale prediction on replaced interworking branch"
  936. depends on CPU_V7
  937. help
  938. This option enables the workaround for the 430973 Cortex-A8
  939. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  940. interworking branch is replaced with another code sequence at the
  941. same virtual address, whether due to self-modifying code or virtual
  942. to physical address re-mapping, Cortex-A8 does not recover from the
  943. stale interworking branch prediction. This results in Cortex-A8
  944. executing the new code sequence in the incorrect ARM or Thumb state.
  945. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  946. and also flushes the branch target cache at every context switch.
  947. Note that setting specific bits in the ACTLR register may not be
  948. available in non-secure mode.
  949. config ARM_ERRATA_458693
  950. bool "ARM errata: Processor deadlock when a false hazard is created"
  951. depends on CPU_V7
  952. depends on !ARCH_MULTIPLATFORM
  953. help
  954. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  955. erratum. For very specific sequences of memory operations, it is
  956. possible for a hazard condition intended for a cache line to instead
  957. be incorrectly associated with a different cache line. This false
  958. hazard might then cause a processor deadlock. The workaround enables
  959. the L1 caching of the NEON accesses and disables the PLD instruction
  960. in the ACTLR register. Note that setting specific bits in the ACTLR
  961. register may not be available in non-secure mode.
  962. config ARM_ERRATA_460075
  963. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  964. depends on CPU_V7
  965. depends on !ARCH_MULTIPLATFORM
  966. help
  967. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  968. erratum. Any asynchronous access to the L2 cache may encounter a
  969. situation in which recent store transactions to the L2 cache are lost
  970. and overwritten with stale memory contents from external memory. The
  971. workaround disables the write-allocate mode for the L2 cache via the
  972. ACTLR register. Note that setting specific bits in the ACTLR register
  973. may not be available in non-secure mode.
  974. config ARM_ERRATA_742230
  975. bool "ARM errata: DMB operation may be faulty"
  976. depends on CPU_V7 && SMP
  977. depends on !ARCH_MULTIPLATFORM
  978. help
  979. This option enables the workaround for the 742230 Cortex-A9
  980. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  981. between two write operations may not ensure the correct visibility
  982. ordering of the two writes. This workaround sets a specific bit in
  983. the diagnostic register of the Cortex-A9 which causes the DMB
  984. instruction to behave as a DSB, ensuring the correct behaviour of
  985. the two writes.
  986. config ARM_ERRATA_742231
  987. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  988. depends on CPU_V7 && SMP
  989. depends on !ARCH_MULTIPLATFORM
  990. help
  991. This option enables the workaround for the 742231 Cortex-A9
  992. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  993. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  994. accessing some data located in the same cache line, may get corrupted
  995. data due to bad handling of the address hazard when the line gets
  996. replaced from one of the CPUs at the same time as another CPU is
  997. accessing it. This workaround sets specific bits in the diagnostic
  998. register of the Cortex-A9 which reduces the linefill issuing
  999. capabilities of the processor.
  1000. config PL310_ERRATA_588369
  1001. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  1002. depends on CACHE_L2X0
  1003. help
  1004. The PL310 L2 cache controller implements three types of Clean &
  1005. Invalidate maintenance operations: by Physical Address
  1006. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1007. They are architecturally defined to behave as the execution of a
  1008. clean operation followed immediately by an invalidate operation,
  1009. both performing to the same memory location. This functionality
  1010. is not correctly implemented in PL310 as clean lines are not
  1011. invalidated as a result of these operations.
  1012. config ARM_ERRATA_720789
  1013. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1014. depends on CPU_V7
  1015. help
  1016. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1017. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1018. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1019. As a consequence of this erratum, some TLB entries which should be
  1020. invalidated are not, resulting in an incoherency in the system page
  1021. tables. The workaround changes the TLB flushing routines to invalidate
  1022. entries regardless of the ASID.
  1023. config PL310_ERRATA_727915
  1024. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1025. depends on CACHE_L2X0
  1026. help
  1027. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1028. operation (offset 0x7FC). This operation runs in background so that
  1029. PL310 can handle normal accesses while it is in progress. Under very
  1030. rare circumstances, due to this erratum, write data can be lost when
  1031. PL310 treats a cacheable write transaction during a Clean &
  1032. Invalidate by Way operation.
  1033. config ARM_ERRATA_743622
  1034. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1035. depends on CPU_V7
  1036. depends on !ARCH_MULTIPLATFORM
  1037. help
  1038. This option enables the workaround for the 743622 Cortex-A9
  1039. (r2p*) erratum. Under very rare conditions, a faulty
  1040. optimisation in the Cortex-A9 Store Buffer may lead to data
  1041. corruption. This workaround sets a specific bit in the diagnostic
  1042. register of the Cortex-A9 which disables the Store Buffer
  1043. optimisation, preventing the defect from occurring. This has no
  1044. visible impact on the overall performance or power consumption of the
  1045. processor.
  1046. config ARM_ERRATA_751472
  1047. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1048. depends on CPU_V7
  1049. depends on !ARCH_MULTIPLATFORM
  1050. help
  1051. This option enables the workaround for the 751472 Cortex-A9 (prior
  1052. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1053. completion of a following broadcasted operation if the second
  1054. operation is received by a CPU before the ICIALLUIS has completed,
  1055. potentially leading to corrupted entries in the cache or TLB.
  1056. config PL310_ERRATA_753970
  1057. bool "PL310 errata: cache sync operation may be faulty"
  1058. depends on CACHE_PL310
  1059. help
  1060. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1061. Under some condition the effect of cache sync operation on
  1062. the store buffer still remains when the operation completes.
  1063. This means that the store buffer is always asked to drain and
  1064. this prevents it from merging any further writes. The workaround
  1065. is to replace the normal offset of cache sync operation (0x730)
  1066. by another offset targeting an unmapped PL310 register 0x740.
  1067. This has the same effect as the cache sync operation: store buffer
  1068. drain and waiting for all buffers empty.
  1069. config ARM_ERRATA_754322
  1070. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1071. depends on CPU_V7
  1072. help
  1073. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1074. r3p*) erratum. A speculative memory access may cause a page table walk
  1075. which starts prior to an ASID switch but completes afterwards. This
  1076. can populate the micro-TLB with a stale entry which may be hit with
  1077. the new ASID. This workaround places two dsb instructions in the mm
  1078. switching code so that no page table walks can cross the ASID switch.
  1079. config ARM_ERRATA_754327
  1080. bool "ARM errata: no automatic Store Buffer drain"
  1081. depends on CPU_V7 && SMP
  1082. help
  1083. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1084. r2p0) erratum. The Store Buffer does not have any automatic draining
  1085. mechanism and therefore a livelock may occur if an external agent
  1086. continuously polls a memory location waiting to observe an update.
  1087. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1088. written polling loops from denying visibility of updates to memory.
  1089. config ARM_ERRATA_364296
  1090. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1091. depends on CPU_V6 && !SMP
  1092. help
  1093. This options enables the workaround for the 364296 ARM1136
  1094. r0p2 erratum (possible cache data corruption with
  1095. hit-under-miss enabled). It sets the undocumented bit 31 in
  1096. the auxiliary control register and the FI bit in the control
  1097. register, thus disabling hit-under-miss without putting the
  1098. processor into full low interrupt latency mode. ARM11MPCore
  1099. is not affected.
  1100. config ARM_ERRATA_764369
  1101. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1102. depends on CPU_V7 && SMP
  1103. help
  1104. This option enables the workaround for erratum 764369
  1105. affecting Cortex-A9 MPCore with two or more processors (all
  1106. current revisions). Under certain timing circumstances, a data
  1107. cache line maintenance operation by MVA targeting an Inner
  1108. Shareable memory region may fail to proceed up to either the
  1109. Point of Coherency or to the Point of Unification of the
  1110. system. This workaround adds a DSB instruction before the
  1111. relevant cache maintenance functions and sets a specific bit
  1112. in the diagnostic control register of the SCU.
  1113. config PL310_ERRATA_769419
  1114. bool "PL310 errata: no automatic Store Buffer drain"
  1115. depends on CACHE_L2X0
  1116. help
  1117. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1118. not automatically drain. This can cause normal, non-cacheable
  1119. writes to be retained when the memory system is idle, leading
  1120. to suboptimal I/O performance for drivers using coherent DMA.
  1121. This option adds a write barrier to the cpu_idle loop so that,
  1122. on systems with an outer cache, the store buffer is drained
  1123. explicitly.
  1124. config ARM_ERRATA_775420
  1125. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1126. depends on CPU_V7
  1127. help
  1128. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1129. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1130. operation aborts with MMU exception, it might cause the processor
  1131. to deadlock. This workaround puts DSB before executing ISB if
  1132. an abort may occur on cache maintenance.
  1133. config ARM_ERRATA_798181
  1134. bool "ARM errata: TLBI/DSB failure on Cortex-A15"
  1135. depends on CPU_V7 && SMP
  1136. help
  1137. On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
  1138. adequately shooting down all use of the old entries. This
  1139. option enables the Linux kernel workaround for this erratum
  1140. which sends an IPI to the CPUs that are running the same ASID
  1141. as the one being invalidated.
  1142. endmenu
  1143. source "arch/arm/common/Kconfig"
  1144. menu "Bus support"
  1145. config ARM_AMBA
  1146. bool
  1147. config ISA
  1148. bool
  1149. help
  1150. Find out whether you have ISA slots on your motherboard. ISA is the
  1151. name of a bus system, i.e. the way the CPU talks to the other stuff
  1152. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1153. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1154. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1155. # Select ISA DMA controller support
  1156. config ISA_DMA
  1157. bool
  1158. select ISA_DMA_API
  1159. # Select ISA DMA interface
  1160. config ISA_DMA_API
  1161. bool
  1162. config PCI
  1163. bool "PCI support" if MIGHT_HAVE_PCI
  1164. help
  1165. Find out whether you have a PCI motherboard. PCI is the name of a
  1166. bus system, i.e. the way the CPU talks to the other stuff inside
  1167. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1168. VESA. If you have PCI, say Y, otherwise N.
  1169. config PCI_DOMAINS
  1170. bool
  1171. depends on PCI
  1172. config PCI_NANOENGINE
  1173. bool "BSE nanoEngine PCI support"
  1174. depends on SA1100_NANOENGINE
  1175. help
  1176. Enable PCI on the BSE nanoEngine board.
  1177. config PCI_SYSCALL
  1178. def_bool PCI
  1179. # Select the host bridge type
  1180. config PCI_HOST_VIA82C505
  1181. bool
  1182. depends on PCI && ARCH_SHARK
  1183. default y
  1184. config PCI_HOST_ITE8152
  1185. bool
  1186. depends on PCI && MACH_ARMCORE
  1187. default y
  1188. select DMABOUNCE
  1189. source "drivers/pci/Kconfig"
  1190. source "drivers/pcmcia/Kconfig"
  1191. endmenu
  1192. menu "Kernel Features"
  1193. config HAVE_SMP
  1194. bool
  1195. help
  1196. This option should be selected by machines which have an SMP-
  1197. capable CPU.
  1198. The only effect of this option is to make the SMP-related
  1199. options available to the user for configuration.
  1200. config SMP
  1201. bool "Symmetric Multi-Processing"
  1202. depends on CPU_V6K || CPU_V7
  1203. depends on GENERIC_CLOCKEVENTS
  1204. depends on HAVE_SMP
  1205. depends on MMU
  1206. select USE_GENERIC_SMP_HELPERS
  1207. help
  1208. This enables support for systems with more than one CPU. If you have
  1209. a system with only one CPU, like most personal computers, say N. If
  1210. you have a system with more than one CPU, say Y.
  1211. If you say N here, the kernel will run on single and multiprocessor
  1212. machines, but will use only one CPU of a multiprocessor machine. If
  1213. you say Y here, the kernel will run on many, but not all, single
  1214. processor machines. On a single processor machine, the kernel will
  1215. run faster if you say N here.
  1216. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1217. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1218. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1219. If you don't know what to do here, say N.
  1220. config SMP_ON_UP
  1221. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1222. depends on SMP && !XIP_KERNEL
  1223. default y
  1224. help
  1225. SMP kernels contain instructions which fail on non-SMP processors.
  1226. Enabling this option allows the kernel to modify itself to make
  1227. these instructions safe. Disabling it allows about 1K of space
  1228. savings.
  1229. If you don't know what to do here, say Y.
  1230. config ARM_CPU_TOPOLOGY
  1231. bool "Support cpu topology definition"
  1232. depends on SMP && CPU_V7
  1233. default y
  1234. help
  1235. Support ARM cpu topology definition. The MPIDR register defines
  1236. affinity between processors which is then used to describe the cpu
  1237. topology of an ARM System.
  1238. config SCHED_MC
  1239. bool "Multi-core scheduler support"
  1240. depends on ARM_CPU_TOPOLOGY
  1241. help
  1242. Multi-core scheduler support improves the CPU scheduler's decision
  1243. making when dealing with multi-core CPU chips at a cost of slightly
  1244. increased overhead in some places. If unsure say N here.
  1245. config SCHED_SMT
  1246. bool "SMT scheduler support"
  1247. depends on ARM_CPU_TOPOLOGY
  1248. help
  1249. Improves the CPU scheduler's decision making when dealing with
  1250. MultiThreading at a cost of slightly increased overhead in some
  1251. places. If unsure say N here.
  1252. config HAVE_ARM_SCU
  1253. bool
  1254. help
  1255. This option enables support for the ARM system coherency unit
  1256. config HAVE_ARM_ARCH_TIMER
  1257. bool "Architected timer support"
  1258. depends on CPU_V7
  1259. select ARM_ARCH_TIMER
  1260. help
  1261. This option enables support for the ARM architected timer
  1262. config HAVE_ARM_TWD
  1263. bool
  1264. depends on SMP
  1265. select CLKSRC_OF if OF
  1266. help
  1267. This options enables support for the ARM timer and watchdog unit
  1268. config MCPM
  1269. bool "Multi-Cluster Power Management"
  1270. depends on CPU_V7 && SMP
  1271. help
  1272. This option provides the common power management infrastructure
  1273. for (multi-)cluster based systems, such as big.LITTLE based
  1274. systems.
  1275. choice
  1276. prompt "Memory split"
  1277. default VMSPLIT_3G
  1278. help
  1279. Select the desired split between kernel and user memory.
  1280. If you are not absolutely sure what you are doing, leave this
  1281. option alone!
  1282. config VMSPLIT_3G
  1283. bool "3G/1G user/kernel split"
  1284. config VMSPLIT_2G
  1285. bool "2G/2G user/kernel split"
  1286. config VMSPLIT_1G
  1287. bool "1G/3G user/kernel split"
  1288. endchoice
  1289. config PAGE_OFFSET
  1290. hex
  1291. default 0x40000000 if VMSPLIT_1G
  1292. default 0x80000000 if VMSPLIT_2G
  1293. default 0xC0000000
  1294. config NR_CPUS
  1295. int "Maximum number of CPUs (2-32)"
  1296. range 2 32
  1297. depends on SMP
  1298. default "4"
  1299. config HOTPLUG_CPU
  1300. bool "Support for hot-pluggable CPUs"
  1301. depends on SMP && HOTPLUG
  1302. help
  1303. Say Y here to experiment with turning CPUs off and on. CPUs
  1304. can be controlled through /sys/devices/system/cpu.
  1305. config ARM_PSCI
  1306. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1307. depends on CPU_V7
  1308. help
  1309. Say Y here if you want Linux to communicate with system firmware
  1310. implementing the PSCI specification for CPU-centric power
  1311. management operations described in ARM document number ARM DEN
  1312. 0022A ("Power State Coordination Interface System Software on
  1313. ARM processors").
  1314. config LOCAL_TIMERS
  1315. bool "Use local timer interrupts"
  1316. depends on SMP
  1317. default y
  1318. help
  1319. Enable support for local timers on SMP platforms, rather then the
  1320. legacy IPI broadcast method. Local timers allows the system
  1321. accounting to be spread across the timer interval, preventing a
  1322. "thundering herd" at every timer tick.
  1323. # The GPIO number here must be sorted by descending number. In case of
  1324. # a multiplatform kernel, we just want the highest value required by the
  1325. # selected platforms.
  1326. config ARCH_NR_GPIO
  1327. int
  1328. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1329. default 512 if SOC_OMAP5
  1330. default 392 if ARCH_U8500
  1331. default 352 if ARCH_VT8500
  1332. default 288 if ARCH_SUNXI
  1333. default 264 if MACH_H4700
  1334. default 0
  1335. help
  1336. Maximum number of GPIOs in the system.
  1337. If unsure, leave the default value.
  1338. source kernel/Kconfig.preempt
  1339. config HZ
  1340. int
  1341. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1342. ARCH_S5PV210 || ARCH_EXYNOS4
  1343. default AT91_TIMER_HZ if ARCH_AT91
  1344. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1345. default 100
  1346. config SCHED_HRTICK
  1347. def_bool HIGH_RES_TIMERS
  1348. config THUMB2_KERNEL
  1349. bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
  1350. depends on CPU_V7 && !CPU_V6 && !CPU_V6K
  1351. default y if CPU_THUMBONLY
  1352. select AEABI
  1353. select ARM_ASM_UNIFIED
  1354. select ARM_UNWIND
  1355. help
  1356. By enabling this option, the kernel will be compiled in
  1357. Thumb-2 mode. A compiler/assembler that understand the unified
  1358. ARM-Thumb syntax is needed.
  1359. If unsure, say N.
  1360. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1361. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1362. depends on THUMB2_KERNEL && MODULES
  1363. default y
  1364. help
  1365. Various binutils versions can resolve Thumb-2 branches to
  1366. locally-defined, preemptible global symbols as short-range "b.n"
  1367. branch instructions.
  1368. This is a problem, because there's no guarantee the final
  1369. destination of the symbol, or any candidate locations for a
  1370. trampoline, are within range of the branch. For this reason, the
  1371. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1372. relocation in modules at all, and it makes little sense to add
  1373. support.
  1374. The symptom is that the kernel fails with an "unsupported
  1375. relocation" error when loading some modules.
  1376. Until fixed tools are available, passing
  1377. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1378. code which hits this problem, at the cost of a bit of extra runtime
  1379. stack usage in some cases.
  1380. The problem is described in more detail at:
  1381. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1382. Only Thumb-2 kernels are affected.
  1383. Unless you are sure your tools don't have this problem, say Y.
  1384. config ARM_ASM_UNIFIED
  1385. bool
  1386. config AEABI
  1387. bool "Use the ARM EABI to compile the kernel"
  1388. help
  1389. This option allows for the kernel to be compiled using the latest
  1390. ARM ABI (aka EABI). This is only useful if you are using a user
  1391. space environment that is also compiled with EABI.
  1392. Since there are major incompatibilities between the legacy ABI and
  1393. EABI, especially with regard to structure member alignment, this
  1394. option also changes the kernel syscall calling convention to
  1395. disambiguate both ABIs and allow for backward compatibility support
  1396. (selected with CONFIG_OABI_COMPAT).
  1397. To use this you need GCC version 4.0.0 or later.
  1398. config OABI_COMPAT
  1399. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1400. depends on AEABI && !THUMB2_KERNEL
  1401. default y
  1402. help
  1403. This option preserves the old syscall interface along with the
  1404. new (ARM EABI) one. It also provides a compatibility layer to
  1405. intercept syscalls that have structure arguments which layout
  1406. in memory differs between the legacy ABI and the new ARM EABI
  1407. (only for non "thumb" binaries). This option adds a tiny
  1408. overhead to all syscalls and produces a slightly larger kernel.
  1409. If you know you'll be using only pure EABI user space then you
  1410. can say N here. If this option is not selected and you attempt
  1411. to execute a legacy ABI binary then the result will be
  1412. UNPREDICTABLE (in fact it can be predicted that it won't work
  1413. at all). If in doubt say Y.
  1414. config ARCH_HAS_HOLES_MEMORYMODEL
  1415. bool
  1416. config ARCH_SPARSEMEM_ENABLE
  1417. bool
  1418. config ARCH_SPARSEMEM_DEFAULT
  1419. def_bool ARCH_SPARSEMEM_ENABLE
  1420. config ARCH_SELECT_MEMORY_MODEL
  1421. def_bool ARCH_SPARSEMEM_ENABLE
  1422. config HAVE_ARCH_PFN_VALID
  1423. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1424. config HIGHMEM
  1425. bool "High Memory Support"
  1426. depends on MMU
  1427. help
  1428. The address space of ARM processors is only 4 Gigabytes large
  1429. and it has to accommodate user address space, kernel address
  1430. space as well as some memory mapped IO. That means that, if you
  1431. have a large amount of physical memory and/or IO, not all of the
  1432. memory can be "permanently mapped" by the kernel. The physical
  1433. memory that is not permanently mapped is called "high memory".
  1434. Depending on the selected kernel/user memory split, minimum
  1435. vmalloc space and actual amount of RAM, you may not need this
  1436. option which should result in a slightly faster kernel.
  1437. If unsure, say n.
  1438. config HIGHPTE
  1439. bool "Allocate 2nd-level pagetables from highmem"
  1440. depends on HIGHMEM
  1441. config HW_PERF_EVENTS
  1442. bool "Enable hardware performance counter support for perf events"
  1443. depends on PERF_EVENTS
  1444. default y
  1445. help
  1446. Enable hardware performance counter support for perf events. If
  1447. disabled, perf events will use software events only.
  1448. source "mm/Kconfig"
  1449. config FORCE_MAX_ZONEORDER
  1450. int "Maximum zone order" if ARCH_SHMOBILE
  1451. range 11 64 if ARCH_SHMOBILE
  1452. default "12" if SOC_AM33XX
  1453. default "9" if SA1111
  1454. default "11"
  1455. help
  1456. The kernel memory allocator divides physically contiguous memory
  1457. blocks into "zones", where each zone is a power of two number of
  1458. pages. This option selects the largest power of two that the kernel
  1459. keeps in the memory allocator. If you need to allocate very large
  1460. blocks of physically contiguous memory, then you may need to
  1461. increase this value.
  1462. This config option is actually maximum order plus one. For example,
  1463. a value of 11 means that the largest free memory block is 2^10 pages.
  1464. config ALIGNMENT_TRAP
  1465. bool
  1466. depends on CPU_CP15_MMU
  1467. default y if !ARCH_EBSA110
  1468. select HAVE_PROC_CPU if PROC_FS
  1469. help
  1470. ARM processors cannot fetch/store information which is not
  1471. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1472. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1473. fetch/store instructions will be emulated in software if you say
  1474. here, which has a severe performance impact. This is necessary for
  1475. correct operation of some network protocols. With an IP-only
  1476. configuration it is safe to say N, otherwise say Y.
  1477. config UACCESS_WITH_MEMCPY
  1478. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1479. depends on MMU
  1480. default y if CPU_FEROCEON
  1481. help
  1482. Implement faster copy_to_user and clear_user methods for CPU
  1483. cores where a 8-word STM instruction give significantly higher
  1484. memory write throughput than a sequence of individual 32bit stores.
  1485. A possible side effect is a slight increase in scheduling latency
  1486. between threads sharing the same address space if they invoke
  1487. such copy operations with large buffers.
  1488. However, if the CPU data cache is using a write-allocate mode,
  1489. this option is unlikely to provide any performance gain.
  1490. config SECCOMP
  1491. bool
  1492. prompt "Enable seccomp to safely compute untrusted bytecode"
  1493. ---help---
  1494. This kernel feature is useful for number crunching applications
  1495. that may need to compute untrusted bytecode during their
  1496. execution. By using pipes or other transports made available to
  1497. the process as file descriptors supporting the read/write
  1498. syscalls, it's possible to isolate those applications in
  1499. their own address space using seccomp. Once seccomp is
  1500. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1501. and the task is only allowed to execute a few safe syscalls
  1502. defined by each seccomp mode.
  1503. config CC_STACKPROTECTOR
  1504. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1505. help
  1506. This option turns on the -fstack-protector GCC feature. This
  1507. feature puts, at the beginning of functions, a canary value on
  1508. the stack just before the return address, and validates
  1509. the value just before actually returning. Stack based buffer
  1510. overflows (that need to overwrite this return address) now also
  1511. overwrite the canary, which gets detected and the attack is then
  1512. neutralized via a kernel panic.
  1513. This feature requires gcc version 4.2 or above.
  1514. config XEN_DOM0
  1515. def_bool y
  1516. depends on XEN
  1517. config XEN
  1518. bool "Xen guest support on ARM (EXPERIMENTAL)"
  1519. depends on ARM && AEABI && OF
  1520. depends on CPU_V7 && !CPU_V6
  1521. depends on !GENERIC_ATOMIC64
  1522. select ARM_PSCI
  1523. help
  1524. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1525. endmenu
  1526. menu "Boot options"
  1527. config USE_OF
  1528. bool "Flattened Device Tree support"
  1529. select IRQ_DOMAIN
  1530. select OF
  1531. select OF_EARLY_FLATTREE
  1532. help
  1533. Include support for flattened device tree machine descriptions.
  1534. config ATAGS
  1535. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1536. default y
  1537. help
  1538. This is the traditional way of passing data to the kernel at boot
  1539. time. If you are solely relying on the flattened device tree (or
  1540. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1541. to remove ATAGS support from your kernel binary. If unsure,
  1542. leave this to y.
  1543. config DEPRECATED_PARAM_STRUCT
  1544. bool "Provide old way to pass kernel parameters"
  1545. depends on ATAGS
  1546. help
  1547. This was deprecated in 2001 and announced to live on for 5 years.
  1548. Some old boot loaders still use this way.
  1549. # Compressed boot loader in ROM. Yes, we really want to ask about
  1550. # TEXT and BSS so we preserve their values in the config files.
  1551. config ZBOOT_ROM_TEXT
  1552. hex "Compressed ROM boot loader base address"
  1553. default "0"
  1554. help
  1555. The physical address at which the ROM-able zImage is to be
  1556. placed in the target. Platforms which normally make use of
  1557. ROM-able zImage formats normally set this to a suitable
  1558. value in their defconfig file.
  1559. If ZBOOT_ROM is not enabled, this has no effect.
  1560. config ZBOOT_ROM_BSS
  1561. hex "Compressed ROM boot loader BSS address"
  1562. default "0"
  1563. help
  1564. The base address of an area of read/write memory in the target
  1565. for the ROM-able zImage which must be available while the
  1566. decompressor is running. It must be large enough to hold the
  1567. entire decompressed kernel plus an additional 128 KiB.
  1568. Platforms which normally make use of ROM-able zImage formats
  1569. normally set this to a suitable value in their defconfig file.
  1570. If ZBOOT_ROM is not enabled, this has no effect.
  1571. config ZBOOT_ROM
  1572. bool "Compressed boot loader in ROM/flash"
  1573. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1574. help
  1575. Say Y here if you intend to execute your compressed kernel image
  1576. (zImage) directly from ROM or flash. If unsure, say N.
  1577. choice
  1578. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1579. depends on ZBOOT_ROM && ARCH_SH7372
  1580. default ZBOOT_ROM_NONE
  1581. help
  1582. Include experimental SD/MMC loading code in the ROM-able zImage.
  1583. With this enabled it is possible to write the ROM-able zImage
  1584. kernel image to an MMC or SD card and boot the kernel straight
  1585. from the reset vector. At reset the processor Mask ROM will load
  1586. the first part of the ROM-able zImage which in turn loads the
  1587. rest the kernel image to RAM.
  1588. config ZBOOT_ROM_NONE
  1589. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1590. help
  1591. Do not load image from SD or MMC
  1592. config ZBOOT_ROM_MMCIF
  1593. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1594. help
  1595. Load image from MMCIF hardware block.
  1596. config ZBOOT_ROM_SH_MOBILE_SDHI
  1597. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1598. help
  1599. Load image from SDHI hardware block
  1600. endchoice
  1601. config ARM_APPENDED_DTB
  1602. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1603. depends on OF && !ZBOOT_ROM
  1604. help
  1605. With this option, the boot code will look for a device tree binary
  1606. (DTB) appended to zImage
  1607. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1608. This is meant as a backward compatibility convenience for those
  1609. systems with a bootloader that can't be upgraded to accommodate
  1610. the documented boot protocol using a device tree.
  1611. Beware that there is very little in terms of protection against
  1612. this option being confused by leftover garbage in memory that might
  1613. look like a DTB header after a reboot if no actual DTB is appended
  1614. to zImage. Do not leave this option active in a production kernel
  1615. if you don't intend to always append a DTB. Proper passing of the
  1616. location into r2 of a bootloader provided DTB is always preferable
  1617. to this option.
  1618. config ARM_ATAG_DTB_COMPAT
  1619. bool "Supplement the appended DTB with traditional ATAG information"
  1620. depends on ARM_APPENDED_DTB
  1621. help
  1622. Some old bootloaders can't be updated to a DTB capable one, yet
  1623. they provide ATAGs with memory configuration, the ramdisk address,
  1624. the kernel cmdline string, etc. Such information is dynamically
  1625. provided by the bootloader and can't always be stored in a static
  1626. DTB. To allow a device tree enabled kernel to be used with such
  1627. bootloaders, this option allows zImage to extract the information
  1628. from the ATAG list and store it at run time into the appended DTB.
  1629. choice
  1630. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1631. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1632. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1633. bool "Use bootloader kernel arguments if available"
  1634. help
  1635. Uses the command-line options passed by the boot loader instead of
  1636. the device tree bootargs property. If the boot loader doesn't provide
  1637. any, the device tree bootargs property will be used.
  1638. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1639. bool "Extend with bootloader kernel arguments"
  1640. help
  1641. The command-line arguments provided by the boot loader will be
  1642. appended to the the device tree bootargs property.
  1643. endchoice
  1644. config CMDLINE
  1645. string "Default kernel command string"
  1646. default ""
  1647. help
  1648. On some architectures (EBSA110 and CATS), there is currently no way
  1649. for the boot loader to pass arguments to the kernel. For these
  1650. architectures, you should supply some command-line options at build
  1651. time by entering them here. As a minimum, you should specify the
  1652. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1653. choice
  1654. prompt "Kernel command line type" if CMDLINE != ""
  1655. default CMDLINE_FROM_BOOTLOADER
  1656. depends on ATAGS
  1657. config CMDLINE_FROM_BOOTLOADER
  1658. bool "Use bootloader kernel arguments if available"
  1659. help
  1660. Uses the command-line options passed by the boot loader. If
  1661. the boot loader doesn't provide any, the default kernel command
  1662. string provided in CMDLINE will be used.
  1663. config CMDLINE_EXTEND
  1664. bool "Extend bootloader kernel arguments"
  1665. help
  1666. The command-line arguments provided by the boot loader will be
  1667. appended to the default kernel command string.
  1668. config CMDLINE_FORCE
  1669. bool "Always use the default kernel command string"
  1670. help
  1671. Always use the default kernel command string, even if the boot
  1672. loader passes other arguments to the kernel.
  1673. This is useful if you cannot or don't want to change the
  1674. command-line options your boot loader passes to the kernel.
  1675. endchoice
  1676. config XIP_KERNEL
  1677. bool "Kernel Execute-In-Place from ROM"
  1678. depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
  1679. help
  1680. Execute-In-Place allows the kernel to run from non-volatile storage
  1681. directly addressable by the CPU, such as NOR flash. This saves RAM
  1682. space since the text section of the kernel is not loaded from flash
  1683. to RAM. Read-write sections, such as the data section and stack,
  1684. are still copied to RAM. The XIP kernel is not compressed since
  1685. it has to run directly from flash, so it will take more space to
  1686. store it. The flash address used to link the kernel object files,
  1687. and for storing it, is configuration dependent. Therefore, if you
  1688. say Y here, you must know the proper physical address where to
  1689. store the kernel image depending on your own flash memory usage.
  1690. Also note that the make target becomes "make xipImage" rather than
  1691. "make zImage" or "make Image". The final kernel binary to put in
  1692. ROM memory will be arch/arm/boot/xipImage.
  1693. If unsure, say N.
  1694. config XIP_PHYS_ADDR
  1695. hex "XIP Kernel Physical Location"
  1696. depends on XIP_KERNEL
  1697. default "0x00080000"
  1698. help
  1699. This is the physical address in your flash memory the kernel will
  1700. be linked for and stored to. This address is dependent on your
  1701. own flash usage.
  1702. config KEXEC
  1703. bool "Kexec system call (EXPERIMENTAL)"
  1704. depends on (!SMP || HOTPLUG_CPU)
  1705. help
  1706. kexec is a system call that implements the ability to shutdown your
  1707. current kernel, and to start another kernel. It is like a reboot
  1708. but it is independent of the system firmware. And like a reboot
  1709. you can start any kernel with it, not just Linux.
  1710. It is an ongoing process to be certain the hardware in a machine
  1711. is properly shutdown, so do not be surprised if this code does not
  1712. initially work for you. It may help to enable device hotplugging
  1713. support.
  1714. config ATAGS_PROC
  1715. bool "Export atags in procfs"
  1716. depends on ATAGS && KEXEC
  1717. default y
  1718. help
  1719. Should the atags used to boot the kernel be exported in an "atags"
  1720. file in procfs. Useful with kexec.
  1721. config CRASH_DUMP
  1722. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1723. help
  1724. Generate crash dump after being started by kexec. This should
  1725. be normally only set in special crash dump kernels which are
  1726. loaded in the main kernel with kexec-tools into a specially
  1727. reserved region and then later executed after a crash by
  1728. kdump/kexec. The crash dump kernel must be compiled to a
  1729. memory address not used by the main kernel
  1730. For more details see Documentation/kdump/kdump.txt
  1731. config AUTO_ZRELADDR
  1732. bool "Auto calculation of the decompressed kernel image address"
  1733. depends on !ZBOOT_ROM && !ARCH_U300
  1734. help
  1735. ZRELADDR is the physical address where the decompressed kernel
  1736. image will be placed. If AUTO_ZRELADDR is selected, the address
  1737. will be determined at run-time by masking the current IP with
  1738. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1739. from start of memory.
  1740. endmenu
  1741. menu "CPU Power Management"
  1742. if ARCH_HAS_CPUFREQ
  1743. source "drivers/cpufreq/Kconfig"
  1744. config CPU_FREQ_S3C
  1745. bool
  1746. help
  1747. Internal configuration node for common cpufreq on Samsung SoC
  1748. config CPU_FREQ_S3C24XX
  1749. bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
  1750. depends on ARCH_S3C24XX && CPU_FREQ
  1751. select CPU_FREQ_S3C
  1752. help
  1753. This enables the CPUfreq driver for the Samsung S3C24XX family
  1754. of CPUs.
  1755. For details, take a look at <file:Documentation/cpu-freq>.
  1756. If in doubt, say N.
  1757. config CPU_FREQ_S3C24XX_PLL
  1758. bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
  1759. depends on CPU_FREQ_S3C24XX
  1760. help
  1761. Compile in support for changing the PLL frequency from the
  1762. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1763. after a frequency change, so by default it is not enabled.
  1764. This also means that the PLL tables for the selected CPU(s) will
  1765. be built which may increase the size of the kernel image.
  1766. config CPU_FREQ_S3C24XX_DEBUG
  1767. bool "Debug CPUfreq Samsung driver core"
  1768. depends on CPU_FREQ_S3C24XX
  1769. help
  1770. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1771. config CPU_FREQ_S3C24XX_IODEBUG
  1772. bool "Debug CPUfreq Samsung driver IO timing"
  1773. depends on CPU_FREQ_S3C24XX
  1774. help
  1775. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1776. config CPU_FREQ_S3C24XX_DEBUGFS
  1777. bool "Export debugfs for CPUFreq"
  1778. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1779. help
  1780. Export status information via debugfs.
  1781. endif
  1782. source "drivers/cpuidle/Kconfig"
  1783. endmenu
  1784. menu "Floating point emulation"
  1785. comment "At least one emulation must be selected"
  1786. config FPE_NWFPE
  1787. bool "NWFPE math emulation"
  1788. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1789. ---help---
  1790. Say Y to include the NWFPE floating point emulator in the kernel.
  1791. This is necessary to run most binaries. Linux does not currently
  1792. support floating point hardware so you need to say Y here even if
  1793. your machine has an FPA or floating point co-processor podule.
  1794. You may say N here if you are going to load the Acorn FPEmulator
  1795. early in the bootup.
  1796. config FPE_NWFPE_XP
  1797. bool "Support extended precision"
  1798. depends on FPE_NWFPE
  1799. help
  1800. Say Y to include 80-bit support in the kernel floating-point
  1801. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1802. Note that gcc does not generate 80-bit operations by default,
  1803. so in most cases this option only enlarges the size of the
  1804. floating point emulator without any good reason.
  1805. You almost surely want to say N here.
  1806. config FPE_FASTFPE
  1807. bool "FastFPE math emulation (EXPERIMENTAL)"
  1808. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1809. ---help---
  1810. Say Y here to include the FAST floating point emulator in the kernel.
  1811. This is an experimental much faster emulator which now also has full
  1812. precision for the mantissa. It does not support any exceptions.
  1813. It is very simple, and approximately 3-6 times faster than NWFPE.
  1814. It should be sufficient for most programs. It may be not suitable
  1815. for scientific calculations, but you have to check this for yourself.
  1816. If you do not feel you need a faster FP emulation you should better
  1817. choose NWFPE.
  1818. config VFP
  1819. bool "VFP-format floating point maths"
  1820. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1821. help
  1822. Say Y to include VFP support code in the kernel. This is needed
  1823. if your hardware includes a VFP unit.
  1824. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1825. release notes and additional status information.
  1826. Say N if your target does not have VFP hardware.
  1827. config VFPv3
  1828. bool
  1829. depends on VFP
  1830. default y if CPU_V7
  1831. config NEON
  1832. bool "Advanced SIMD (NEON) Extension support"
  1833. depends on VFPv3 && CPU_V7
  1834. help
  1835. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1836. Extension.
  1837. endmenu
  1838. menu "Userspace binary formats"
  1839. source "fs/Kconfig.binfmt"
  1840. config ARTHUR
  1841. tristate "RISC OS personality"
  1842. depends on !AEABI
  1843. help
  1844. Say Y here to include the kernel code necessary if you want to run
  1845. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1846. experimental; if this sounds frightening, say N and sleep in peace.
  1847. You can also say M here to compile this support as a module (which
  1848. will be called arthur).
  1849. endmenu
  1850. menu "Power management options"
  1851. source "kernel/power/Kconfig"
  1852. config ARCH_SUSPEND_POSSIBLE
  1853. depends on !ARCH_S5PC100
  1854. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1855. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1856. def_bool y
  1857. config ARM_CPU_SUSPEND
  1858. def_bool PM_SLEEP
  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"
  1867. source "arch/arm/kvm/Kconfig"