Kconfig 62 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_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  7. select ARCH_HAVE_CUSTOM_GPIO_H
  8. select ARCH_MIGHT_HAVE_PC_PARPORT
  9. select ARCH_SUPPORTS_ATOMIC_RMW
  10. select ARCH_USE_BUILTIN_BSWAP
  11. select ARCH_USE_CMPXCHG_LOCKREF
  12. select ARCH_WANT_IPC_PARSE_VERSION
  13. select BUILDTIME_EXTABLE_SORT if MMU
  14. select CLONE_BACKWARDS
  15. select CPU_PM if (SUSPEND || CPU_IDLE)
  16. select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
  17. select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
  18. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  19. select GENERIC_IDLE_POLL_SETUP
  20. select GENERIC_IRQ_PROBE
  21. select GENERIC_IRQ_SHOW
  22. select GENERIC_PCI_IOMAP
  23. select GENERIC_SCHED_CLOCK
  24. select GENERIC_SMP_IDLE_THREAD
  25. select GENERIC_STRNCPY_FROM_USER
  26. select GENERIC_STRNLEN_USER
  27. select HARDIRQS_SW_RESEND
  28. select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
  29. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  30. select HAVE_ARCH_KGDB
  31. select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
  32. select HAVE_ARCH_TRACEHOOK
  33. select HAVE_BPF_JIT
  34. select HAVE_CC_STACKPROTECTOR
  35. select HAVE_CONTEXT_TRACKING
  36. select HAVE_C_RECORDMCOUNT
  37. select HAVE_DEBUG_KMEMLEAK
  38. select HAVE_DMA_API_DEBUG
  39. select HAVE_DMA_ATTRS
  40. select HAVE_DMA_CONTIGUOUS if MMU
  41. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  42. select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
  43. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  44. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  45. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  46. select HAVE_GENERIC_DMA_COHERENT
  47. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  48. select HAVE_IDE if PCI || ISA || PCMCIA
  49. select HAVE_IRQ_TIME_ACCOUNTING
  50. select HAVE_KERNEL_GZIP
  51. select HAVE_KERNEL_LZ4
  52. select HAVE_KERNEL_LZMA
  53. select HAVE_KERNEL_LZO
  54. select HAVE_KERNEL_XZ
  55. select HAVE_KPROBES if !XIP_KERNEL
  56. select HAVE_KRETPROBES if (HAVE_KPROBES)
  57. select HAVE_MEMBLOCK
  58. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  59. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  60. select HAVE_PERF_EVENTS
  61. select HAVE_PERF_REGS
  62. select HAVE_PERF_USER_STACK_DUMP
  63. select HAVE_REGS_AND_STACK_ACCESS_API
  64. select HAVE_SYSCALL_TRACEPOINTS
  65. select HAVE_UID16
  66. select HAVE_VIRT_CPU_ACCOUNTING_GEN
  67. select IRQ_FORCED_THREADING
  68. select MODULES_USE_ELF_REL
  69. select NO_BOOTMEM
  70. select OLD_SIGACTION
  71. select OLD_SIGSUSPEND3
  72. select PERF_USE_VMALLOC
  73. select RTC_LIB
  74. select SYS_SUPPORTS_APM_EMULATION
  75. # Above selects are sorted alphabetically; please add new ones
  76. # according to that. Thanks.
  77. help
  78. The ARM series is a line of low-power-consumption RISC chip designs
  79. licensed by ARM Ltd and targeted at embedded applications and
  80. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  81. manufactured, but legacy ARM-based PC hardware remains popular in
  82. Europe. There is an ARM Linux project with a web page at
  83. <http://www.arm.linux.org.uk/>.
  84. config ARM_HAS_SG_CHAIN
  85. select ARCH_HAS_SG_CHAIN
  86. bool
  87. config NEED_SG_DMA_LENGTH
  88. bool
  89. config ARM_DMA_USE_IOMMU
  90. bool
  91. select ARM_HAS_SG_CHAIN
  92. select NEED_SG_DMA_LENGTH
  93. if ARM_DMA_USE_IOMMU
  94. config ARM_DMA_IOMMU_ALIGNMENT
  95. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  96. range 4 9
  97. default 8
  98. help
  99. DMA mapping framework by default aligns all buffers to the smallest
  100. PAGE_SIZE order which is greater than or equal to the requested buffer
  101. size. This works well for buffers up to a few hundreds kilobytes, but
  102. for larger buffers it just a waste of address space. Drivers which has
  103. relatively small addressing window (like 64Mib) might run out of
  104. virtual space with just a few allocations.
  105. With this parameter you can specify the maximum PAGE_SIZE order for
  106. DMA IOMMU buffers. Larger buffers will be aligned only to this
  107. specified order. The order is expressed as a power of two multiplied
  108. by the PAGE_SIZE.
  109. endif
  110. config MIGHT_HAVE_PCI
  111. bool
  112. config SYS_SUPPORTS_APM_EMULATION
  113. bool
  114. config HAVE_TCM
  115. bool
  116. select GENERIC_ALLOCATOR
  117. config HAVE_PROC_CPU
  118. bool
  119. config NO_IOPORT_MAP
  120. bool
  121. config EISA
  122. bool
  123. ---help---
  124. The Extended Industry Standard Architecture (EISA) bus was
  125. developed as an open alternative to the IBM MicroChannel bus.
  126. The EISA bus provided some of the features of the IBM MicroChannel
  127. bus while maintaining backward compatibility with cards made for
  128. the older ISA bus. The EISA bus saw limited use between 1988 and
  129. 1995 when it was made obsolete by the PCI bus.
  130. Say Y here if you are building a kernel for an EISA-based machine.
  131. Otherwise, say N.
  132. config SBUS
  133. bool
  134. config STACKTRACE_SUPPORT
  135. bool
  136. default y
  137. config HAVE_LATENCYTOP_SUPPORT
  138. bool
  139. depends on !SMP
  140. default y
  141. config LOCKDEP_SUPPORT
  142. bool
  143. default y
  144. config TRACE_IRQFLAGS_SUPPORT
  145. bool
  146. default y
  147. config RWSEM_XCHGADD_ALGORITHM
  148. bool
  149. default y
  150. config ARCH_HAS_ILOG2_U32
  151. bool
  152. config ARCH_HAS_ILOG2_U64
  153. bool
  154. config ARCH_HAS_BANDGAP
  155. bool
  156. config GENERIC_HWEIGHT
  157. bool
  158. default y
  159. config GENERIC_CALIBRATE_DELAY
  160. bool
  161. default y
  162. config ARCH_MAY_HAVE_PC_FDC
  163. bool
  164. config ZONE_DMA
  165. bool
  166. config NEED_DMA_MAP_STATE
  167. def_bool y
  168. config ARCH_SUPPORTS_UPROBES
  169. def_bool y
  170. config ARCH_HAS_DMA_SET_COHERENT_MASK
  171. bool
  172. config GENERIC_ISA_DMA
  173. bool
  174. config FIQ
  175. bool
  176. config NEED_RET_TO_USER
  177. bool
  178. config ARCH_MTD_XIP
  179. bool
  180. config VECTORS_BASE
  181. hex
  182. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  183. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  184. default 0x00000000
  185. help
  186. The base address of exception vectors. This must be two pages
  187. in size.
  188. config ARM_PATCH_PHYS_VIRT
  189. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  190. default y
  191. depends on !XIP_KERNEL && MMU
  192. depends on !ARCH_REALVIEW || !SPARSEMEM
  193. help
  194. Patch phys-to-virt and virt-to-phys translation functions at
  195. boot and module load time according to the position of the
  196. kernel in system memory.
  197. This can only be used with non-XIP MMU kernels where the base
  198. of physical memory is at a 16MB boundary.
  199. Only disable this option if you know that you do not require
  200. this feature (eg, building a kernel for a single machine) and
  201. you need to shrink the kernel to the minimal size.
  202. config NEED_MACH_IO_H
  203. bool
  204. help
  205. Select this when mach/io.h is required to provide special
  206. definitions for this platform. The need for mach/io.h should
  207. be avoided when possible.
  208. config NEED_MACH_MEMORY_H
  209. bool
  210. help
  211. Select this when mach/memory.h is required to provide special
  212. definitions for this platform. The need for mach/memory.h should
  213. be avoided when possible.
  214. config PHYS_OFFSET
  215. hex "Physical address of main memory" if MMU
  216. depends on !ARM_PATCH_PHYS_VIRT
  217. default DRAM_BASE if !MMU
  218. default 0x00000000 if ARCH_EBSA110 || \
  219. EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
  220. ARCH_FOOTBRIDGE || \
  221. ARCH_INTEGRATOR || \
  222. ARCH_IOP13XX || \
  223. ARCH_KS8695 || \
  224. (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
  225. default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
  226. default 0x20000000 if ARCH_S5PV210
  227. default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
  228. default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
  229. default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
  230. default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
  231. default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
  232. help
  233. Please provide the physical address corresponding to the
  234. location of main memory in your system.
  235. config GENERIC_BUG
  236. def_bool y
  237. depends on BUG
  238. source "init/Kconfig"
  239. source "kernel/Kconfig.freezer"
  240. menu "System Type"
  241. config MMU
  242. bool "MMU-based Paged Memory Management Support"
  243. default y
  244. help
  245. Select if you want MMU-based virtualised addressing space
  246. support by paged memory management. If unsure, say 'Y'.
  247. #
  248. # The "ARM system type" choice list is ordered alphabetically by option
  249. # text. Please add new entries in the option alphabetic order.
  250. #
  251. choice
  252. prompt "ARM system type"
  253. default ARCH_VERSATILE if !MMU
  254. default ARCH_MULTIPLATFORM if MMU
  255. config ARCH_MULTIPLATFORM
  256. bool "Allow multiple platforms to be selected"
  257. depends on MMU
  258. select ARCH_WANT_OPTIONAL_GPIOLIB
  259. select ARM_HAS_SG_CHAIN
  260. select ARM_PATCH_PHYS_VIRT
  261. select AUTO_ZRELADDR
  262. select CLKSRC_OF
  263. select COMMON_CLK
  264. select GENERIC_CLOCKEVENTS
  265. select MIGHT_HAVE_PCI
  266. select MULTI_IRQ_HANDLER
  267. select SPARSE_IRQ
  268. select USE_OF
  269. config ARCH_INTEGRATOR
  270. bool "ARM Ltd. Integrator family"
  271. select ARM_AMBA
  272. select ARM_PATCH_PHYS_VIRT if MMU
  273. select AUTO_ZRELADDR
  274. select COMMON_CLK
  275. select COMMON_CLK_VERSATILE
  276. select GENERIC_CLOCKEVENTS
  277. select HAVE_TCM
  278. select ICST
  279. select MULTI_IRQ_HANDLER
  280. select PLAT_VERSATILE
  281. select SPARSE_IRQ
  282. select USE_OF
  283. select VERSATILE_FPGA_IRQ
  284. help
  285. Support for ARM's Integrator platform.
  286. config ARCH_REALVIEW
  287. bool "ARM Ltd. RealView family"
  288. select ARCH_WANT_OPTIONAL_GPIOLIB
  289. select ARM_AMBA
  290. select ARM_TIMER_SP804
  291. select COMMON_CLK
  292. select COMMON_CLK_VERSATILE
  293. select GENERIC_CLOCKEVENTS
  294. select GPIO_PL061 if GPIOLIB
  295. select ICST
  296. select NEED_MACH_MEMORY_H
  297. select PLAT_VERSATILE
  298. help
  299. This enables support for ARM Ltd RealView boards.
  300. config ARCH_VERSATILE
  301. bool "ARM Ltd. Versatile family"
  302. select ARCH_WANT_OPTIONAL_GPIOLIB
  303. select ARM_AMBA
  304. select ARM_TIMER_SP804
  305. select ARM_VIC
  306. select CLKDEV_LOOKUP
  307. select GENERIC_CLOCKEVENTS
  308. select HAVE_MACH_CLKDEV
  309. select ICST
  310. select PLAT_VERSATILE
  311. select PLAT_VERSATILE_CLOCK
  312. select VERSATILE_FPGA_IRQ
  313. help
  314. This enables support for ARM Ltd Versatile board.
  315. config ARCH_AT91
  316. bool "Atmel AT91"
  317. select ARCH_REQUIRE_GPIOLIB
  318. select CLKDEV_LOOKUP
  319. select IRQ_DOMAIN
  320. select NEED_MACH_IO_H if PCCARD
  321. select PINCTRL
  322. select PINCTRL_AT91 if USE_OF
  323. help
  324. This enables support for systems based on Atmel
  325. AT91RM9200 and AT91SAM9* processors.
  326. config ARCH_CLPS711X
  327. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  328. select ARCH_REQUIRE_GPIOLIB
  329. select AUTO_ZRELADDR
  330. select CLKSRC_MMIO
  331. select COMMON_CLK
  332. select CPU_ARM720T
  333. select GENERIC_CLOCKEVENTS
  334. select MFD_SYSCON
  335. help
  336. Support for Cirrus Logic 711x/721x/731x based boards.
  337. config ARCH_GEMINI
  338. bool "Cortina Systems Gemini"
  339. select ARCH_REQUIRE_GPIOLIB
  340. select CLKSRC_MMIO
  341. select CPU_FA526
  342. select GENERIC_CLOCKEVENTS
  343. help
  344. Support for the Cortina Systems Gemini family SoCs
  345. config ARCH_EBSA110
  346. bool "EBSA-110"
  347. select ARCH_USES_GETTIMEOFFSET
  348. select CPU_SA110
  349. select ISA
  350. select NEED_MACH_IO_H
  351. select NEED_MACH_MEMORY_H
  352. select NO_IOPORT_MAP
  353. help
  354. This is an evaluation board for the StrongARM processor available
  355. from Digital. It has limited hardware on-board, including an
  356. Ethernet interface, two PCMCIA sockets, two serial ports and a
  357. parallel port.
  358. config ARCH_EFM32
  359. bool "Energy Micro efm32"
  360. depends on !MMU
  361. select ARCH_REQUIRE_GPIOLIB
  362. select ARM_NVIC
  363. select AUTO_ZRELADDR
  364. select CLKSRC_OF
  365. select COMMON_CLK
  366. select CPU_V7M
  367. select GENERIC_CLOCKEVENTS
  368. select NO_DMA
  369. select NO_IOPORT_MAP
  370. select SPARSE_IRQ
  371. select USE_OF
  372. help
  373. Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
  374. processors.
  375. config ARCH_EP93XX
  376. bool "EP93xx-based"
  377. select ARCH_HAS_HOLES_MEMORYMODEL
  378. select ARCH_REQUIRE_GPIOLIB
  379. select ARCH_USES_GETTIMEOFFSET
  380. select ARM_AMBA
  381. select ARM_VIC
  382. select CLKDEV_LOOKUP
  383. select CPU_ARM920T
  384. help
  385. This enables support for the Cirrus EP93xx series of CPUs.
  386. config ARCH_FOOTBRIDGE
  387. bool "FootBridge"
  388. select CPU_SA110
  389. select FOOTBRIDGE
  390. select GENERIC_CLOCKEVENTS
  391. select HAVE_IDE
  392. select NEED_MACH_IO_H if !MMU
  393. select NEED_MACH_MEMORY_H
  394. help
  395. Support for systems based on the DC21285 companion chip
  396. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  397. config ARCH_NETX
  398. bool "Hilscher NetX based"
  399. select ARM_VIC
  400. select CLKSRC_MMIO
  401. select CPU_ARM926T
  402. select GENERIC_CLOCKEVENTS
  403. help
  404. This enables support for systems based on the Hilscher NetX Soc
  405. config ARCH_IOP13XX
  406. bool "IOP13xx-based"
  407. depends on MMU
  408. select CPU_XSC3
  409. select NEED_MACH_MEMORY_H
  410. select NEED_RET_TO_USER
  411. select PCI
  412. select PLAT_IOP
  413. select VMSPLIT_1G
  414. select SPARSE_IRQ
  415. help
  416. Support for Intel's IOP13XX (XScale) family of processors.
  417. config ARCH_IOP32X
  418. bool "IOP32x-based"
  419. depends on MMU
  420. select ARCH_REQUIRE_GPIOLIB
  421. select CPU_XSCALE
  422. select GPIO_IOP
  423. select NEED_RET_TO_USER
  424. select PCI
  425. select PLAT_IOP
  426. help
  427. Support for Intel's 80219 and IOP32X (XScale) family of
  428. processors.
  429. config ARCH_IOP33X
  430. bool "IOP33x-based"
  431. depends on MMU
  432. select ARCH_REQUIRE_GPIOLIB
  433. select CPU_XSCALE
  434. select GPIO_IOP
  435. select NEED_RET_TO_USER
  436. select PCI
  437. select PLAT_IOP
  438. help
  439. Support for Intel's IOP33X (XScale) family of processors.
  440. config ARCH_IXP4XX
  441. bool "IXP4xx-based"
  442. depends on MMU
  443. select ARCH_HAS_DMA_SET_COHERENT_MASK
  444. select ARCH_REQUIRE_GPIOLIB
  445. select ARCH_SUPPORTS_BIG_ENDIAN
  446. select CLKSRC_MMIO
  447. select CPU_XSCALE
  448. select DMABOUNCE if PCI
  449. select GENERIC_CLOCKEVENTS
  450. select MIGHT_HAVE_PCI
  451. select NEED_MACH_IO_H
  452. select USB_EHCI_BIG_ENDIAN_DESC
  453. select USB_EHCI_BIG_ENDIAN_MMIO
  454. help
  455. Support for Intel's IXP4XX (XScale) family of processors.
  456. config ARCH_DOVE
  457. bool "Marvell Dove"
  458. select ARCH_REQUIRE_GPIOLIB
  459. select CPU_PJ4
  460. select GENERIC_CLOCKEVENTS
  461. select MIGHT_HAVE_PCI
  462. select MVEBU_MBUS
  463. select PINCTRL
  464. select PINCTRL_DOVE
  465. select PLAT_ORION_LEGACY
  466. help
  467. Support for the Marvell Dove SoC 88AP510
  468. config ARCH_MV78XX0
  469. bool "Marvell MV78xx0"
  470. select ARCH_REQUIRE_GPIOLIB
  471. select CPU_FEROCEON
  472. select GENERIC_CLOCKEVENTS
  473. select MVEBU_MBUS
  474. select PCI
  475. select PLAT_ORION_LEGACY
  476. help
  477. Support for the following Marvell MV78xx0 series SoCs:
  478. MV781x0, MV782x0.
  479. config ARCH_ORION5X
  480. bool "Marvell Orion"
  481. depends on MMU
  482. select ARCH_REQUIRE_GPIOLIB
  483. select CPU_FEROCEON
  484. select GENERIC_CLOCKEVENTS
  485. select MVEBU_MBUS
  486. select PCI
  487. select PLAT_ORION_LEGACY
  488. help
  489. Support for the following Marvell Orion 5x series SoCs:
  490. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  491. Orion-2 (5281), Orion-1-90 (6183).
  492. config ARCH_MMP
  493. bool "Marvell PXA168/910/MMP2"
  494. depends on MMU
  495. select ARCH_REQUIRE_GPIOLIB
  496. select CLKDEV_LOOKUP
  497. select GENERIC_ALLOCATOR
  498. select GENERIC_CLOCKEVENTS
  499. select GPIO_PXA
  500. select IRQ_DOMAIN
  501. select MULTI_IRQ_HANDLER
  502. select PINCTRL
  503. select PLAT_PXA
  504. select SPARSE_IRQ
  505. help
  506. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  507. config ARCH_KS8695
  508. bool "Micrel/Kendin KS8695"
  509. select ARCH_REQUIRE_GPIOLIB
  510. select CLKSRC_MMIO
  511. select CPU_ARM922T
  512. select GENERIC_CLOCKEVENTS
  513. select NEED_MACH_MEMORY_H
  514. help
  515. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  516. System-on-Chip devices.
  517. config ARCH_W90X900
  518. bool "Nuvoton W90X900 CPU"
  519. select ARCH_REQUIRE_GPIOLIB
  520. select CLKDEV_LOOKUP
  521. select CLKSRC_MMIO
  522. select CPU_ARM926T
  523. select GENERIC_CLOCKEVENTS
  524. help
  525. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  526. At present, the w90x900 has been renamed nuc900, regarding
  527. the ARM series product line, you can login the following
  528. link address to know more.
  529. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  530. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  531. config ARCH_LPC32XX
  532. bool "NXP LPC32XX"
  533. select ARCH_REQUIRE_GPIOLIB
  534. select ARM_AMBA
  535. select CLKDEV_LOOKUP
  536. select CLKSRC_MMIO
  537. select CPU_ARM926T
  538. select GENERIC_CLOCKEVENTS
  539. select HAVE_IDE
  540. select USE_OF
  541. help
  542. Support for the NXP LPC32XX family of processors
  543. config ARCH_PXA
  544. bool "PXA2xx/PXA3xx-based"
  545. depends on MMU
  546. select ARCH_MTD_XIP
  547. select ARCH_REQUIRE_GPIOLIB
  548. select ARM_CPU_SUSPEND if PM
  549. select AUTO_ZRELADDR
  550. select CLKDEV_LOOKUP
  551. select CLKSRC_MMIO
  552. select CLKSRC_OF
  553. select GENERIC_CLOCKEVENTS
  554. select GPIO_PXA
  555. select HAVE_IDE
  556. select MULTI_IRQ_HANDLER
  557. select PLAT_PXA
  558. select SPARSE_IRQ
  559. help
  560. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  561. config ARCH_MSM
  562. bool "Qualcomm MSM (non-multiplatform)"
  563. select ARCH_REQUIRE_GPIOLIB
  564. select COMMON_CLK
  565. select GENERIC_CLOCKEVENTS
  566. help
  567. Support for Qualcomm MSM/QSD based systems. This runs on the
  568. apps processor of the MSM/QSD and depends on a shared memory
  569. interface to the modem processor which runs the baseband
  570. stack and controls some vital subsystems
  571. (clock and power control, etc).
  572. config ARCH_SHMOBILE_LEGACY
  573. bool "Renesas ARM SoCs (non-multiplatform)"
  574. select ARCH_SHMOBILE
  575. select ARM_PATCH_PHYS_VIRT if MMU
  576. select CLKDEV_LOOKUP
  577. select GENERIC_CLOCKEVENTS
  578. select HAVE_ARM_SCU if SMP
  579. select HAVE_ARM_TWD if SMP
  580. select HAVE_MACH_CLKDEV
  581. select HAVE_SMP
  582. select MIGHT_HAVE_CACHE_L2X0
  583. select MULTI_IRQ_HANDLER
  584. select NO_IOPORT_MAP
  585. select PINCTRL
  586. select PM_GENERIC_DOMAINS if PM
  587. select SPARSE_IRQ
  588. help
  589. Support for Renesas ARM SoC platforms using a non-multiplatform
  590. kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
  591. and RZ families.
  592. config ARCH_RPC
  593. bool "RiscPC"
  594. select ARCH_ACORN
  595. select ARCH_MAY_HAVE_PC_FDC
  596. select ARCH_SPARSEMEM_ENABLE
  597. select ARCH_USES_GETTIMEOFFSET
  598. select CPU_SA110
  599. select FIQ
  600. select HAVE_IDE
  601. select HAVE_PATA_PLATFORM
  602. select ISA_DMA_API
  603. select NEED_MACH_IO_H
  604. select NEED_MACH_MEMORY_H
  605. select NO_IOPORT_MAP
  606. select VIRT_TO_BUS
  607. help
  608. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  609. CD-ROM interface, serial and parallel port, and the floppy drive.
  610. config ARCH_SA1100
  611. bool "SA1100-based"
  612. select ARCH_MTD_XIP
  613. select ARCH_REQUIRE_GPIOLIB
  614. select ARCH_SPARSEMEM_ENABLE
  615. select CLKDEV_LOOKUP
  616. select CLKSRC_MMIO
  617. select CPU_FREQ
  618. select CPU_SA1100
  619. select GENERIC_CLOCKEVENTS
  620. select HAVE_IDE
  621. select ISA
  622. select NEED_MACH_MEMORY_H
  623. select SPARSE_IRQ
  624. help
  625. Support for StrongARM 11x0 based boards.
  626. config ARCH_S3C24XX
  627. bool "Samsung S3C24XX SoCs"
  628. select ARCH_REQUIRE_GPIOLIB
  629. select ATAGS
  630. select CLKDEV_LOOKUP
  631. select CLKSRC_SAMSUNG_PWM
  632. select GENERIC_CLOCKEVENTS
  633. select GPIO_SAMSUNG
  634. select HAVE_S3C2410_I2C if I2C
  635. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  636. select HAVE_S3C_RTC if RTC_CLASS
  637. select MULTI_IRQ_HANDLER
  638. select NEED_MACH_IO_H
  639. select SAMSUNG_ATAGS
  640. help
  641. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  642. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  643. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  644. Samsung SMDK2410 development board (and derivatives).
  645. config ARCH_S3C64XX
  646. bool "Samsung S3C64XX"
  647. select ARCH_REQUIRE_GPIOLIB
  648. select ARM_AMBA
  649. select ARM_VIC
  650. select ATAGS
  651. select CLKDEV_LOOKUP
  652. select CLKSRC_SAMSUNG_PWM
  653. select COMMON_CLK_SAMSUNG
  654. select CPU_V6K
  655. select GENERIC_CLOCKEVENTS
  656. select GPIO_SAMSUNG
  657. select HAVE_S3C2410_I2C if I2C
  658. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  659. select HAVE_TCM
  660. select NO_IOPORT_MAP
  661. select PLAT_SAMSUNG
  662. select PM_GENERIC_DOMAINS if PM
  663. select S3C_DEV_NAND
  664. select S3C_GPIO_TRACK
  665. select SAMSUNG_ATAGS
  666. select SAMSUNG_WAKEMASK
  667. select SAMSUNG_WDT_RESET
  668. help
  669. Samsung S3C64XX series based systems
  670. config ARCH_DAVINCI
  671. bool "TI DaVinci"
  672. select ARCH_HAS_HOLES_MEMORYMODEL
  673. select ARCH_REQUIRE_GPIOLIB
  674. select CLKDEV_LOOKUP
  675. select GENERIC_ALLOCATOR
  676. select GENERIC_CLOCKEVENTS
  677. select GENERIC_IRQ_CHIP
  678. select HAVE_IDE
  679. select TI_PRIV_EDMA
  680. select USE_OF
  681. select ZONE_DMA
  682. help
  683. Support for TI's DaVinci platform.
  684. config ARCH_OMAP1
  685. bool "TI OMAP1"
  686. depends on MMU
  687. select ARCH_HAS_HOLES_MEMORYMODEL
  688. select ARCH_OMAP
  689. select ARCH_REQUIRE_GPIOLIB
  690. select CLKDEV_LOOKUP
  691. select CLKSRC_MMIO
  692. select GENERIC_CLOCKEVENTS
  693. select GENERIC_IRQ_CHIP
  694. select HAVE_IDE
  695. select IRQ_DOMAIN
  696. select NEED_MACH_IO_H if PCCARD
  697. select NEED_MACH_MEMORY_H
  698. help
  699. Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
  700. endchoice
  701. menu "Multiple platform selection"
  702. depends on ARCH_MULTIPLATFORM
  703. comment "CPU Core family selection"
  704. config ARCH_MULTI_V4
  705. bool "ARMv4 based platforms (FA526)"
  706. depends on !ARCH_MULTI_V6_V7
  707. select ARCH_MULTI_V4_V5
  708. select CPU_FA526
  709. config ARCH_MULTI_V4T
  710. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  711. depends on !ARCH_MULTI_V6_V7
  712. select ARCH_MULTI_V4_V5
  713. select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
  714. CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
  715. CPU_ARM925T || CPU_ARM940T)
  716. config ARCH_MULTI_V5
  717. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  718. depends on !ARCH_MULTI_V6_V7
  719. select ARCH_MULTI_V4_V5
  720. select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
  721. CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
  722. CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
  723. config ARCH_MULTI_V4_V5
  724. bool
  725. config ARCH_MULTI_V6
  726. bool "ARMv6 based platforms (ARM11)"
  727. select ARCH_MULTI_V6_V7
  728. select CPU_V6K
  729. config ARCH_MULTI_V7
  730. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  731. default y
  732. select ARCH_MULTI_V6_V7
  733. select CPU_V7
  734. select HAVE_SMP
  735. config ARCH_MULTI_V6_V7
  736. bool
  737. select MIGHT_HAVE_CACHE_L2X0
  738. config ARCH_MULTI_CPU_AUTO
  739. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  740. select ARCH_MULTI_V5
  741. endmenu
  742. config ARCH_VIRT
  743. bool "Dummy Virtual Machine" if ARCH_MULTI_V7
  744. select ARM_AMBA
  745. select ARM_GIC
  746. select ARM_PSCI
  747. select HAVE_ARM_ARCH_TIMER
  748. #
  749. # This is sorted alphabetically by mach-* pathname. However, plat-*
  750. # Kconfigs may be included either alphabetically (according to the
  751. # plat- suffix) or along side the corresponding mach-* source.
  752. #
  753. source "arch/arm/mach-mvebu/Kconfig"
  754. source "arch/arm/mach-at91/Kconfig"
  755. source "arch/arm/mach-axxia/Kconfig"
  756. source "arch/arm/mach-bcm/Kconfig"
  757. source "arch/arm/mach-berlin/Kconfig"
  758. source "arch/arm/mach-clps711x/Kconfig"
  759. source "arch/arm/mach-cns3xxx/Kconfig"
  760. source "arch/arm/mach-davinci/Kconfig"
  761. source "arch/arm/mach-dove/Kconfig"
  762. source "arch/arm/mach-ep93xx/Kconfig"
  763. source "arch/arm/mach-footbridge/Kconfig"
  764. source "arch/arm/mach-gemini/Kconfig"
  765. source "arch/arm/mach-highbank/Kconfig"
  766. source "arch/arm/mach-hisi/Kconfig"
  767. source "arch/arm/mach-integrator/Kconfig"
  768. source "arch/arm/mach-iop32x/Kconfig"
  769. source "arch/arm/mach-iop33x/Kconfig"
  770. source "arch/arm/mach-iop13xx/Kconfig"
  771. source "arch/arm/mach-ixp4xx/Kconfig"
  772. source "arch/arm/mach-keystone/Kconfig"
  773. source "arch/arm/mach-ks8695/Kconfig"
  774. source "arch/arm/mach-msm/Kconfig"
  775. source "arch/arm/mach-moxart/Kconfig"
  776. source "arch/arm/mach-mv78xx0/Kconfig"
  777. source "arch/arm/mach-imx/Kconfig"
  778. source "arch/arm/mach-mediatek/Kconfig"
  779. source "arch/arm/mach-mxs/Kconfig"
  780. source "arch/arm/mach-netx/Kconfig"
  781. source "arch/arm/mach-nomadik/Kconfig"
  782. source "arch/arm/mach-nspire/Kconfig"
  783. source "arch/arm/plat-omap/Kconfig"
  784. source "arch/arm/mach-omap1/Kconfig"
  785. source "arch/arm/mach-omap2/Kconfig"
  786. source "arch/arm/mach-orion5x/Kconfig"
  787. source "arch/arm/mach-picoxcell/Kconfig"
  788. source "arch/arm/mach-pxa/Kconfig"
  789. source "arch/arm/plat-pxa/Kconfig"
  790. source "arch/arm/mach-mmp/Kconfig"
  791. source "arch/arm/mach-qcom/Kconfig"
  792. source "arch/arm/mach-realview/Kconfig"
  793. source "arch/arm/mach-rockchip/Kconfig"
  794. source "arch/arm/mach-sa1100/Kconfig"
  795. source "arch/arm/mach-socfpga/Kconfig"
  796. source "arch/arm/mach-spear/Kconfig"
  797. source "arch/arm/mach-sti/Kconfig"
  798. source "arch/arm/mach-s3c24xx/Kconfig"
  799. source "arch/arm/mach-s3c64xx/Kconfig"
  800. source "arch/arm/mach-s5pv210/Kconfig"
  801. source "arch/arm/mach-exynos/Kconfig"
  802. source "arch/arm/plat-samsung/Kconfig"
  803. source "arch/arm/mach-shmobile/Kconfig"
  804. source "arch/arm/mach-sunxi/Kconfig"
  805. source "arch/arm/mach-prima2/Kconfig"
  806. source "arch/arm/mach-tegra/Kconfig"
  807. source "arch/arm/mach-u300/Kconfig"
  808. source "arch/arm/mach-ux500/Kconfig"
  809. source "arch/arm/mach-versatile/Kconfig"
  810. source "arch/arm/mach-vexpress/Kconfig"
  811. source "arch/arm/plat-versatile/Kconfig"
  812. source "arch/arm/mach-vt8500/Kconfig"
  813. source "arch/arm/mach-w90x900/Kconfig"
  814. source "arch/arm/mach-zynq/Kconfig"
  815. # Definitions to make life easier
  816. config ARCH_ACORN
  817. bool
  818. config PLAT_IOP
  819. bool
  820. select GENERIC_CLOCKEVENTS
  821. config PLAT_ORION
  822. bool
  823. select CLKSRC_MMIO
  824. select COMMON_CLK
  825. select GENERIC_IRQ_CHIP
  826. select IRQ_DOMAIN
  827. config PLAT_ORION_LEGACY
  828. bool
  829. select PLAT_ORION
  830. config PLAT_PXA
  831. bool
  832. config PLAT_VERSATILE
  833. bool
  834. config ARM_TIMER_SP804
  835. bool
  836. select CLKSRC_MMIO
  837. select CLKSRC_OF if OF
  838. source "arch/arm/firmware/Kconfig"
  839. source arch/arm/mm/Kconfig
  840. config IWMMXT
  841. bool "Enable iWMMXt support"
  842. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
  843. default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
  844. help
  845. Enable support for iWMMXt context switching at run time if
  846. running on a CPU that supports it.
  847. config MULTI_IRQ_HANDLER
  848. bool
  849. help
  850. Allow each machine to specify it's own IRQ handler at run time.
  851. if !MMU
  852. source "arch/arm/Kconfig-nommu"
  853. endif
  854. config PJ4B_ERRATA_4742
  855. bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
  856. depends on CPU_PJ4B && MACH_ARMADA_370
  857. default y
  858. help
  859. When coming out of either a Wait for Interrupt (WFI) or a Wait for
  860. Event (WFE) IDLE states, a specific timing sensitivity exists between
  861. the retiring WFI/WFE instructions and the newly issued subsequent
  862. instructions. This sensitivity can result in a CPU hang scenario.
  863. Workaround:
  864. The software must insert either a Data Synchronization Barrier (DSB)
  865. or Data Memory Barrier (DMB) command immediately after the WFI/WFE
  866. instruction
  867. config ARM_ERRATA_326103
  868. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  869. depends on CPU_V6
  870. help
  871. Executing a SWP instruction to read-only memory does not set bit 11
  872. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  873. treat the access as a read, preventing a COW from occurring and
  874. causing the faulting task to livelock.
  875. config ARM_ERRATA_411920
  876. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  877. depends on CPU_V6 || CPU_V6K
  878. help
  879. Invalidation of the Instruction Cache operation can
  880. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  881. It does not affect the MPCore. This option enables the ARM Ltd.
  882. recommended workaround.
  883. config ARM_ERRATA_430973
  884. bool "ARM errata: Stale prediction on replaced interworking branch"
  885. depends on CPU_V7
  886. help
  887. This option enables the workaround for the 430973 Cortex-A8
  888. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  889. interworking branch is replaced with another code sequence at the
  890. same virtual address, whether due to self-modifying code or virtual
  891. to physical address re-mapping, Cortex-A8 does not recover from the
  892. stale interworking branch prediction. This results in Cortex-A8
  893. executing the new code sequence in the incorrect ARM or Thumb state.
  894. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  895. and also flushes the branch target cache at every context switch.
  896. Note that setting specific bits in the ACTLR register may not be
  897. available in non-secure mode.
  898. config ARM_ERRATA_458693
  899. bool "ARM errata: Processor deadlock when a false hazard is created"
  900. depends on CPU_V7
  901. depends on !ARCH_MULTIPLATFORM
  902. help
  903. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  904. erratum. For very specific sequences of memory operations, it is
  905. possible for a hazard condition intended for a cache line to instead
  906. be incorrectly associated with a different cache line. This false
  907. hazard might then cause a processor deadlock. The workaround enables
  908. the L1 caching of the NEON accesses and disables the PLD instruction
  909. in the ACTLR register. Note that setting specific bits in the ACTLR
  910. register may not be available in non-secure mode.
  911. config ARM_ERRATA_460075
  912. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  913. depends on CPU_V7
  914. depends on !ARCH_MULTIPLATFORM
  915. help
  916. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  917. erratum. Any asynchronous access to the L2 cache may encounter a
  918. situation in which recent store transactions to the L2 cache are lost
  919. and overwritten with stale memory contents from external memory. The
  920. workaround disables the write-allocate mode for the L2 cache via the
  921. ACTLR register. Note that setting specific bits in the ACTLR register
  922. may not be available in non-secure mode.
  923. config ARM_ERRATA_742230
  924. bool "ARM errata: DMB operation may be faulty"
  925. depends on CPU_V7 && SMP
  926. depends on !ARCH_MULTIPLATFORM
  927. help
  928. This option enables the workaround for the 742230 Cortex-A9
  929. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  930. between two write operations may not ensure the correct visibility
  931. ordering of the two writes. This workaround sets a specific bit in
  932. the diagnostic register of the Cortex-A9 which causes the DMB
  933. instruction to behave as a DSB, ensuring the correct behaviour of
  934. the two writes.
  935. config ARM_ERRATA_742231
  936. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  937. depends on CPU_V7 && SMP
  938. depends on !ARCH_MULTIPLATFORM
  939. help
  940. This option enables the workaround for the 742231 Cortex-A9
  941. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  942. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  943. accessing some data located in the same cache line, may get corrupted
  944. data due to bad handling of the address hazard when the line gets
  945. replaced from one of the CPUs at the same time as another CPU is
  946. accessing it. This workaround sets specific bits in the diagnostic
  947. register of the Cortex-A9 which reduces the linefill issuing
  948. capabilities of the processor.
  949. config ARM_ERRATA_643719
  950. bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
  951. depends on CPU_V7 && SMP
  952. help
  953. This option enables the workaround for the 643719 Cortex-A9 (prior to
  954. r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
  955. register returns zero when it should return one. The workaround
  956. corrects this value, ensuring cache maintenance operations which use
  957. it behave as intended and avoiding data corruption.
  958. config ARM_ERRATA_720789
  959. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  960. depends on CPU_V7
  961. help
  962. This option enables the workaround for the 720789 Cortex-A9 (prior to
  963. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  964. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  965. As a consequence of this erratum, some TLB entries which should be
  966. invalidated are not, resulting in an incoherency in the system page
  967. tables. The workaround changes the TLB flushing routines to invalidate
  968. entries regardless of the ASID.
  969. config ARM_ERRATA_743622
  970. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  971. depends on CPU_V7
  972. depends on !ARCH_MULTIPLATFORM
  973. help
  974. This option enables the workaround for the 743622 Cortex-A9
  975. (r2p*) erratum. Under very rare conditions, a faulty
  976. optimisation in the Cortex-A9 Store Buffer may lead to data
  977. corruption. This workaround sets a specific bit in the diagnostic
  978. register of the Cortex-A9 which disables the Store Buffer
  979. optimisation, preventing the defect from occurring. This has no
  980. visible impact on the overall performance or power consumption of the
  981. processor.
  982. config ARM_ERRATA_751472
  983. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  984. depends on CPU_V7
  985. depends on !ARCH_MULTIPLATFORM
  986. help
  987. This option enables the workaround for the 751472 Cortex-A9 (prior
  988. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  989. completion of a following broadcasted operation if the second
  990. operation is received by a CPU before the ICIALLUIS has completed,
  991. potentially leading to corrupted entries in the cache or TLB.
  992. config ARM_ERRATA_754322
  993. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  994. depends on CPU_V7
  995. help
  996. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  997. r3p*) erratum. A speculative memory access may cause a page table walk
  998. which starts prior to an ASID switch but completes afterwards. This
  999. can populate the micro-TLB with a stale entry which may be hit with
  1000. the new ASID. This workaround places two dsb instructions in the mm
  1001. switching code so that no page table walks can cross the ASID switch.
  1002. config ARM_ERRATA_754327
  1003. bool "ARM errata: no automatic Store Buffer drain"
  1004. depends on CPU_V7 && SMP
  1005. help
  1006. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1007. r2p0) erratum. The Store Buffer does not have any automatic draining
  1008. mechanism and therefore a livelock may occur if an external agent
  1009. continuously polls a memory location waiting to observe an update.
  1010. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1011. written polling loops from denying visibility of updates to memory.
  1012. config ARM_ERRATA_364296
  1013. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1014. depends on CPU_V6
  1015. help
  1016. This options enables the workaround for the 364296 ARM1136
  1017. r0p2 erratum (possible cache data corruption with
  1018. hit-under-miss enabled). It sets the undocumented bit 31 in
  1019. the auxiliary control register and the FI bit in the control
  1020. register, thus disabling hit-under-miss without putting the
  1021. processor into full low interrupt latency mode. ARM11MPCore
  1022. is not affected.
  1023. config ARM_ERRATA_764369
  1024. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1025. depends on CPU_V7 && SMP
  1026. help
  1027. This option enables the workaround for erratum 764369
  1028. affecting Cortex-A9 MPCore with two or more processors (all
  1029. current revisions). Under certain timing circumstances, a data
  1030. cache line maintenance operation by MVA targeting an Inner
  1031. Shareable memory region may fail to proceed up to either the
  1032. Point of Coherency or to the Point of Unification of the
  1033. system. This workaround adds a DSB instruction before the
  1034. relevant cache maintenance functions and sets a specific bit
  1035. in the diagnostic control register of the SCU.
  1036. config ARM_ERRATA_775420
  1037. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1038. depends on CPU_V7
  1039. help
  1040. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1041. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1042. operation aborts with MMU exception, it might cause the processor
  1043. to deadlock. This workaround puts DSB before executing ISB if
  1044. an abort may occur on cache maintenance.
  1045. config ARM_ERRATA_798181
  1046. bool "ARM errata: TLBI/DSB failure on Cortex-A15"
  1047. depends on CPU_V7 && SMP
  1048. help
  1049. On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
  1050. adequately shooting down all use of the old entries. This
  1051. option enables the Linux kernel workaround for this erratum
  1052. which sends an IPI to the CPUs that are running the same ASID
  1053. as the one being invalidated.
  1054. config ARM_ERRATA_773022
  1055. bool "ARM errata: incorrect instructions may be executed from loop buffer"
  1056. depends on CPU_V7
  1057. help
  1058. This option enables the workaround for the 773022 Cortex-A15
  1059. (up to r0p4) erratum. In certain rare sequences of code, the
  1060. loop buffer may deliver incorrect instructions. This
  1061. workaround disables the loop buffer to avoid the erratum.
  1062. endmenu
  1063. source "arch/arm/common/Kconfig"
  1064. menu "Bus support"
  1065. config ARM_AMBA
  1066. bool
  1067. config ISA
  1068. bool
  1069. help
  1070. Find out whether you have ISA slots on your motherboard. ISA is the
  1071. name of a bus system, i.e. the way the CPU talks to the other stuff
  1072. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1073. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1074. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1075. # Select ISA DMA controller support
  1076. config ISA_DMA
  1077. bool
  1078. select ISA_DMA_API
  1079. # Select ISA DMA interface
  1080. config ISA_DMA_API
  1081. bool
  1082. config PCI
  1083. bool "PCI support" if MIGHT_HAVE_PCI
  1084. help
  1085. Find out whether you have a PCI motherboard. PCI is the name of a
  1086. bus system, i.e. the way the CPU talks to the other stuff inside
  1087. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1088. VESA. If you have PCI, say Y, otherwise N.
  1089. config PCI_DOMAINS
  1090. bool
  1091. depends on PCI
  1092. config PCI_NANOENGINE
  1093. bool "BSE nanoEngine PCI support"
  1094. depends on SA1100_NANOENGINE
  1095. help
  1096. Enable PCI on the BSE nanoEngine board.
  1097. config PCI_SYSCALL
  1098. def_bool PCI
  1099. config PCI_HOST_ITE8152
  1100. bool
  1101. depends on PCI && MACH_ARMCORE
  1102. default y
  1103. select DMABOUNCE
  1104. source "drivers/pci/Kconfig"
  1105. source "drivers/pci/pcie/Kconfig"
  1106. source "drivers/pcmcia/Kconfig"
  1107. endmenu
  1108. menu "Kernel Features"
  1109. config HAVE_SMP
  1110. bool
  1111. help
  1112. This option should be selected by machines which have an SMP-
  1113. capable CPU.
  1114. The only effect of this option is to make the SMP-related
  1115. options available to the user for configuration.
  1116. config SMP
  1117. bool "Symmetric Multi-Processing"
  1118. depends on CPU_V6K || CPU_V7
  1119. depends on GENERIC_CLOCKEVENTS
  1120. depends on HAVE_SMP
  1121. depends on MMU || ARM_MPU
  1122. help
  1123. This enables support for systems with more than one CPU. If you have
  1124. a system with only one CPU, say N. If you have a system with more
  1125. than one CPU, say Y.
  1126. If you say N here, the kernel will run on uni- and multiprocessor
  1127. machines, but will use only one CPU of a multiprocessor machine. If
  1128. you say Y here, the kernel will run on many, but not all,
  1129. uniprocessor machines. On a uniprocessor machine, the kernel
  1130. will run faster if you say N here.
  1131. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1132. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1133. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1134. If you don't know what to do here, say N.
  1135. config SMP_ON_UP
  1136. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1137. depends on SMP && !XIP_KERNEL && MMU
  1138. default y
  1139. help
  1140. SMP kernels contain instructions which fail on non-SMP processors.
  1141. Enabling this option allows the kernel to modify itself to make
  1142. these instructions safe. Disabling it allows about 1K of space
  1143. savings.
  1144. If you don't know what to do here, say Y.
  1145. config ARM_CPU_TOPOLOGY
  1146. bool "Support cpu topology definition"
  1147. depends on SMP && CPU_V7
  1148. default y
  1149. help
  1150. Support ARM cpu topology definition. The MPIDR register defines
  1151. affinity between processors which is then used to describe the cpu
  1152. topology of an ARM System.
  1153. config SCHED_MC
  1154. bool "Multi-core scheduler support"
  1155. depends on ARM_CPU_TOPOLOGY
  1156. help
  1157. Multi-core scheduler support improves the CPU scheduler's decision
  1158. making when dealing with multi-core CPU chips at a cost of slightly
  1159. increased overhead in some places. If unsure say N here.
  1160. config SCHED_SMT
  1161. bool "SMT scheduler support"
  1162. depends on ARM_CPU_TOPOLOGY
  1163. help
  1164. Improves the CPU scheduler's decision making when dealing with
  1165. MultiThreading at a cost of slightly increased overhead in some
  1166. places. If unsure say N here.
  1167. config HAVE_ARM_SCU
  1168. bool
  1169. help
  1170. This option enables support for the ARM system coherency unit
  1171. config HAVE_ARM_ARCH_TIMER
  1172. bool "Architected timer support"
  1173. depends on CPU_V7
  1174. select ARM_ARCH_TIMER
  1175. select GENERIC_CLOCKEVENTS
  1176. help
  1177. This option enables support for the ARM architected timer
  1178. config HAVE_ARM_TWD
  1179. bool
  1180. depends on SMP
  1181. select CLKSRC_OF if OF
  1182. help
  1183. This options enables support for the ARM timer and watchdog unit
  1184. config MCPM
  1185. bool "Multi-Cluster Power Management"
  1186. depends on CPU_V7 && SMP
  1187. help
  1188. This option provides the common power management infrastructure
  1189. for (multi-)cluster based systems, such as big.LITTLE based
  1190. systems.
  1191. config BIG_LITTLE
  1192. bool "big.LITTLE support (Experimental)"
  1193. depends on CPU_V7 && SMP
  1194. select MCPM
  1195. help
  1196. This option enables support selections for the big.LITTLE
  1197. system architecture.
  1198. config BL_SWITCHER
  1199. bool "big.LITTLE switcher support"
  1200. depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
  1201. select ARM_CPU_SUSPEND
  1202. select CPU_PM
  1203. help
  1204. The big.LITTLE "switcher" provides the core functionality to
  1205. transparently handle transition between a cluster of A15's
  1206. and a cluster of A7's in a big.LITTLE system.
  1207. config BL_SWITCHER_DUMMY_IF
  1208. tristate "Simple big.LITTLE switcher user interface"
  1209. depends on BL_SWITCHER && DEBUG_KERNEL
  1210. help
  1211. This is a simple and dummy char dev interface to control
  1212. the big.LITTLE switcher core code. It is meant for
  1213. debugging purposes only.
  1214. choice
  1215. prompt "Memory split"
  1216. depends on MMU
  1217. default VMSPLIT_3G
  1218. help
  1219. Select the desired split between kernel and user memory.
  1220. If you are not absolutely sure what you are doing, leave this
  1221. option alone!
  1222. config VMSPLIT_3G
  1223. bool "3G/1G user/kernel split"
  1224. config VMSPLIT_2G
  1225. bool "2G/2G user/kernel split"
  1226. config VMSPLIT_1G
  1227. bool "1G/3G user/kernel split"
  1228. endchoice
  1229. config PAGE_OFFSET
  1230. hex
  1231. default PHYS_OFFSET if !MMU
  1232. default 0x40000000 if VMSPLIT_1G
  1233. default 0x80000000 if VMSPLIT_2G
  1234. default 0xC0000000
  1235. config NR_CPUS
  1236. int "Maximum number of CPUs (2-32)"
  1237. range 2 32
  1238. depends on SMP
  1239. default "4"
  1240. config HOTPLUG_CPU
  1241. bool "Support for hot-pluggable CPUs"
  1242. depends on SMP
  1243. help
  1244. Say Y here to experiment with turning CPUs off and on. CPUs
  1245. can be controlled through /sys/devices/system/cpu.
  1246. config ARM_PSCI
  1247. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1248. depends on CPU_V7
  1249. help
  1250. Say Y here if you want Linux to communicate with system firmware
  1251. implementing the PSCI specification for CPU-centric power
  1252. management operations described in ARM document number ARM DEN
  1253. 0022A ("Power State Coordination Interface System Software on
  1254. ARM processors").
  1255. # The GPIO number here must be sorted by descending number. In case of
  1256. # a multiplatform kernel, we just want the highest value required by the
  1257. # selected platforms.
  1258. config ARCH_NR_GPIO
  1259. int
  1260. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1261. default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
  1262. SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
  1263. default 416 if ARCH_SUNXI
  1264. default 392 if ARCH_U8500
  1265. default 352 if ARCH_VT8500
  1266. default 288 if ARCH_ROCKCHIP
  1267. default 264 if MACH_H4700
  1268. default 0
  1269. help
  1270. Maximum number of GPIOs in the system.
  1271. If unsure, leave the default value.
  1272. source kernel/Kconfig.preempt
  1273. config HZ_FIXED
  1274. int
  1275. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
  1276. ARCH_S5PV210 || ARCH_EXYNOS4
  1277. default AT91_TIMER_HZ if ARCH_AT91
  1278. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
  1279. default 0
  1280. choice
  1281. depends on HZ_FIXED = 0
  1282. prompt "Timer frequency"
  1283. config HZ_100
  1284. bool "100 Hz"
  1285. config HZ_200
  1286. bool "200 Hz"
  1287. config HZ_250
  1288. bool "250 Hz"
  1289. config HZ_300
  1290. bool "300 Hz"
  1291. config HZ_500
  1292. bool "500 Hz"
  1293. config HZ_1000
  1294. bool "1000 Hz"
  1295. endchoice
  1296. config HZ
  1297. int
  1298. default HZ_FIXED if HZ_FIXED != 0
  1299. default 100 if HZ_100
  1300. default 200 if HZ_200
  1301. default 250 if HZ_250
  1302. default 300 if HZ_300
  1303. default 500 if HZ_500
  1304. default 1000
  1305. config SCHED_HRTICK
  1306. def_bool HIGH_RES_TIMERS
  1307. config THUMB2_KERNEL
  1308. bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
  1309. depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
  1310. default y if CPU_THUMBONLY
  1311. select AEABI
  1312. select ARM_ASM_UNIFIED
  1313. select ARM_UNWIND
  1314. help
  1315. By enabling this option, the kernel will be compiled in
  1316. Thumb-2 mode. A compiler/assembler that understand the unified
  1317. ARM-Thumb syntax is needed.
  1318. If unsure, say N.
  1319. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1320. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1321. depends on THUMB2_KERNEL && MODULES
  1322. default y
  1323. help
  1324. Various binutils versions can resolve Thumb-2 branches to
  1325. locally-defined, preemptible global symbols as short-range "b.n"
  1326. branch instructions.
  1327. This is a problem, because there's no guarantee the final
  1328. destination of the symbol, or any candidate locations for a
  1329. trampoline, are within range of the branch. For this reason, the
  1330. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1331. relocation in modules at all, and it makes little sense to add
  1332. support.
  1333. The symptom is that the kernel fails with an "unsupported
  1334. relocation" error when loading some modules.
  1335. Until fixed tools are available, passing
  1336. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1337. code which hits this problem, at the cost of a bit of extra runtime
  1338. stack usage in some cases.
  1339. The problem is described in more detail at:
  1340. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1341. Only Thumb-2 kernels are affected.
  1342. Unless you are sure your tools don't have this problem, say Y.
  1343. config ARM_ASM_UNIFIED
  1344. bool
  1345. config AEABI
  1346. bool "Use the ARM EABI to compile the kernel"
  1347. help
  1348. This option allows for the kernel to be compiled using the latest
  1349. ARM ABI (aka EABI). This is only useful if you are using a user
  1350. space environment that is also compiled with EABI.
  1351. Since there are major incompatibilities between the legacy ABI and
  1352. EABI, especially with regard to structure member alignment, this
  1353. option also changes the kernel syscall calling convention to
  1354. disambiguate both ABIs and allow for backward compatibility support
  1355. (selected with CONFIG_OABI_COMPAT).
  1356. To use this you need GCC version 4.0.0 or later.
  1357. config OABI_COMPAT
  1358. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1359. depends on AEABI && !THUMB2_KERNEL
  1360. help
  1361. This option preserves the old syscall interface along with the
  1362. new (ARM EABI) one. It also provides a compatibility layer to
  1363. intercept syscalls that have structure arguments which layout
  1364. in memory differs between the legacy ABI and the new ARM EABI
  1365. (only for non "thumb" binaries). This option adds a tiny
  1366. overhead to all syscalls and produces a slightly larger kernel.
  1367. The seccomp filter system will not be available when this is
  1368. selected, since there is no way yet to sensibly distinguish
  1369. between calling conventions during filtering.
  1370. If you know you'll be using only pure EABI user space then you
  1371. can say N here. If this option is not selected and you attempt
  1372. to execute a legacy ABI binary then the result will be
  1373. UNPREDICTABLE (in fact it can be predicted that it won't work
  1374. at all). If in doubt say N.
  1375. config ARCH_HAS_HOLES_MEMORYMODEL
  1376. bool
  1377. config ARCH_SPARSEMEM_ENABLE
  1378. bool
  1379. config ARCH_SPARSEMEM_DEFAULT
  1380. def_bool ARCH_SPARSEMEM_ENABLE
  1381. config ARCH_SELECT_MEMORY_MODEL
  1382. def_bool ARCH_SPARSEMEM_ENABLE
  1383. config HAVE_ARCH_PFN_VALID
  1384. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1385. config HIGHMEM
  1386. bool "High Memory Support"
  1387. depends on MMU
  1388. help
  1389. The address space of ARM processors is only 4 Gigabytes large
  1390. and it has to accommodate user address space, kernel address
  1391. space as well as some memory mapped IO. That means that, if you
  1392. have a large amount of physical memory and/or IO, not all of the
  1393. memory can be "permanently mapped" by the kernel. The physical
  1394. memory that is not permanently mapped is called "high memory".
  1395. Depending on the selected kernel/user memory split, minimum
  1396. vmalloc space and actual amount of RAM, you may not need this
  1397. option which should result in a slightly faster kernel.
  1398. If unsure, say n.
  1399. config HIGHPTE
  1400. bool "Allocate 2nd-level pagetables from highmem"
  1401. depends on HIGHMEM
  1402. config HW_PERF_EVENTS
  1403. bool "Enable hardware performance counter support for perf events"
  1404. depends on PERF_EVENTS
  1405. default y
  1406. help
  1407. Enable hardware performance counter support for perf events. If
  1408. disabled, perf events will use software events only.
  1409. config SYS_SUPPORTS_HUGETLBFS
  1410. def_bool y
  1411. depends on ARM_LPAE
  1412. config HAVE_ARCH_TRANSPARENT_HUGEPAGE
  1413. def_bool y
  1414. depends on ARM_LPAE
  1415. config ARCH_WANT_GENERAL_HUGETLB
  1416. def_bool y
  1417. source "mm/Kconfig"
  1418. config FORCE_MAX_ZONEORDER
  1419. int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
  1420. range 11 64 if ARCH_SHMOBILE_LEGACY
  1421. default "12" if SOC_AM33XX
  1422. default "9" if SA1111 || ARCH_EFM32
  1423. default "11"
  1424. help
  1425. The kernel memory allocator divides physically contiguous memory
  1426. blocks into "zones", where each zone is a power of two number of
  1427. pages. This option selects the largest power of two that the kernel
  1428. keeps in the memory allocator. If you need to allocate very large
  1429. blocks of physically contiguous memory, then you may need to
  1430. increase this value.
  1431. This config option is actually maximum order plus one. For example,
  1432. a value of 11 means that the largest free memory block is 2^10 pages.
  1433. config ALIGNMENT_TRAP
  1434. bool
  1435. depends on CPU_CP15_MMU
  1436. default y if !ARCH_EBSA110
  1437. select HAVE_PROC_CPU if PROC_FS
  1438. help
  1439. ARM processors cannot fetch/store information which is not
  1440. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1441. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1442. fetch/store instructions will be emulated in software if you say
  1443. here, which has a severe performance impact. This is necessary for
  1444. correct operation of some network protocols. With an IP-only
  1445. configuration it is safe to say N, otherwise say Y.
  1446. config UACCESS_WITH_MEMCPY
  1447. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1448. depends on MMU
  1449. default y if CPU_FEROCEON
  1450. help
  1451. Implement faster copy_to_user and clear_user methods for CPU
  1452. cores where a 8-word STM instruction give significantly higher
  1453. memory write throughput than a sequence of individual 32bit stores.
  1454. A possible side effect is a slight increase in scheduling latency
  1455. between threads sharing the same address space if they invoke
  1456. such copy operations with large buffers.
  1457. However, if the CPU data cache is using a write-allocate mode,
  1458. this option is unlikely to provide any performance gain.
  1459. config SECCOMP
  1460. bool
  1461. prompt "Enable seccomp to safely compute untrusted bytecode"
  1462. ---help---
  1463. This kernel feature is useful for number crunching applications
  1464. that may need to compute untrusted bytecode during their
  1465. execution. By using pipes or other transports made available to
  1466. the process as file descriptors supporting the read/write
  1467. syscalls, it's possible to isolate those applications in
  1468. their own address space using seccomp. Once seccomp is
  1469. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1470. and the task is only allowed to execute a few safe syscalls
  1471. defined by each seccomp mode.
  1472. config SWIOTLB
  1473. def_bool y
  1474. config IOMMU_HELPER
  1475. def_bool SWIOTLB
  1476. config XEN_DOM0
  1477. def_bool y
  1478. depends on XEN
  1479. config XEN
  1480. bool "Xen guest support on ARM (EXPERIMENTAL)"
  1481. depends on ARM && AEABI && OF
  1482. depends on CPU_V7 && !CPU_V6
  1483. depends on !GENERIC_ATOMIC64
  1484. depends on MMU
  1485. select ARCH_DMA_ADDR_T_64BIT
  1486. select ARM_PSCI
  1487. select SWIOTLB_XEN
  1488. help
  1489. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1490. endmenu
  1491. menu "Boot options"
  1492. config USE_OF
  1493. bool "Flattened Device Tree support"
  1494. select IRQ_DOMAIN
  1495. select OF
  1496. select OF_EARLY_FLATTREE
  1497. select OF_RESERVED_MEM
  1498. help
  1499. Include support for flattened device tree machine descriptions.
  1500. config ATAGS
  1501. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1502. default y
  1503. help
  1504. This is the traditional way of passing data to the kernel at boot
  1505. time. If you are solely relying on the flattened device tree (or
  1506. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1507. to remove ATAGS support from your kernel binary. If unsure,
  1508. leave this to y.
  1509. config DEPRECATED_PARAM_STRUCT
  1510. bool "Provide old way to pass kernel parameters"
  1511. depends on ATAGS
  1512. help
  1513. This was deprecated in 2001 and announced to live on for 5 years.
  1514. Some old boot loaders still use this way.
  1515. # Compressed boot loader in ROM. Yes, we really want to ask about
  1516. # TEXT and BSS so we preserve their values in the config files.
  1517. config ZBOOT_ROM_TEXT
  1518. hex "Compressed ROM boot loader base address"
  1519. default "0"
  1520. help
  1521. The physical address at which the ROM-able zImage is to be
  1522. placed in the target. Platforms which normally make use of
  1523. ROM-able zImage formats normally set this to a suitable
  1524. value in their defconfig file.
  1525. If ZBOOT_ROM is not enabled, this has no effect.
  1526. config ZBOOT_ROM_BSS
  1527. hex "Compressed ROM boot loader BSS address"
  1528. default "0"
  1529. help
  1530. The base address of an area of read/write memory in the target
  1531. for the ROM-able zImage which must be available while the
  1532. decompressor is running. It must be large enough to hold the
  1533. entire decompressed kernel plus an additional 128 KiB.
  1534. Platforms which normally make use of ROM-able zImage formats
  1535. normally set this to a suitable value in their defconfig file.
  1536. If ZBOOT_ROM is not enabled, this has no effect.
  1537. config ZBOOT_ROM
  1538. bool "Compressed boot loader in ROM/flash"
  1539. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1540. depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
  1541. help
  1542. Say Y here if you intend to execute your compressed kernel image
  1543. (zImage) directly from ROM or flash. If unsure, say N.
  1544. choice
  1545. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1546. depends on ZBOOT_ROM && ARCH_SH7372
  1547. default ZBOOT_ROM_NONE
  1548. help
  1549. Include experimental SD/MMC loading code in the ROM-able zImage.
  1550. With this enabled it is possible to write the ROM-able zImage
  1551. kernel image to an MMC or SD card and boot the kernel straight
  1552. from the reset vector. At reset the processor Mask ROM will load
  1553. the first part of the ROM-able zImage which in turn loads the
  1554. rest the kernel image to RAM.
  1555. config ZBOOT_ROM_NONE
  1556. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1557. help
  1558. Do not load image from SD or MMC
  1559. config ZBOOT_ROM_MMCIF
  1560. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1561. help
  1562. Load image from MMCIF hardware block.
  1563. config ZBOOT_ROM_SH_MOBILE_SDHI
  1564. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1565. help
  1566. Load image from SDHI hardware block
  1567. endchoice
  1568. config ARM_APPENDED_DTB
  1569. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1570. depends on OF
  1571. help
  1572. With this option, the boot code will look for a device tree binary
  1573. (DTB) appended to zImage
  1574. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1575. This is meant as a backward compatibility convenience for those
  1576. systems with a bootloader that can't be upgraded to accommodate
  1577. the documented boot protocol using a device tree.
  1578. Beware that there is very little in terms of protection against
  1579. this option being confused by leftover garbage in memory that might
  1580. look like a DTB header after a reboot if no actual DTB is appended
  1581. to zImage. Do not leave this option active in a production kernel
  1582. if you don't intend to always append a DTB. Proper passing of the
  1583. location into r2 of a bootloader provided DTB is always preferable
  1584. to this option.
  1585. config ARM_ATAG_DTB_COMPAT
  1586. bool "Supplement the appended DTB with traditional ATAG information"
  1587. depends on ARM_APPENDED_DTB
  1588. help
  1589. Some old bootloaders can't be updated to a DTB capable one, yet
  1590. they provide ATAGs with memory configuration, the ramdisk address,
  1591. the kernel cmdline string, etc. Such information is dynamically
  1592. provided by the bootloader and can't always be stored in a static
  1593. DTB. To allow a device tree enabled kernel to be used with such
  1594. bootloaders, this option allows zImage to extract the information
  1595. from the ATAG list and store it at run time into the appended DTB.
  1596. choice
  1597. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1598. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1599. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1600. bool "Use bootloader kernel arguments if available"
  1601. help
  1602. Uses the command-line options passed by the boot loader instead of
  1603. the device tree bootargs property. If the boot loader doesn't provide
  1604. any, the device tree bootargs property will be used.
  1605. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1606. bool "Extend with bootloader kernel arguments"
  1607. help
  1608. The command-line arguments provided by the boot loader will be
  1609. appended to the the device tree bootargs property.
  1610. endchoice
  1611. config CMDLINE
  1612. string "Default kernel command string"
  1613. default ""
  1614. help
  1615. On some architectures (EBSA110 and CATS), there is currently no way
  1616. for the boot loader to pass arguments to the kernel. For these
  1617. architectures, you should supply some command-line options at build
  1618. time by entering them here. As a minimum, you should specify the
  1619. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1620. choice
  1621. prompt "Kernel command line type" if CMDLINE != ""
  1622. default CMDLINE_FROM_BOOTLOADER
  1623. depends on ATAGS
  1624. config CMDLINE_FROM_BOOTLOADER
  1625. bool "Use bootloader kernel arguments if available"
  1626. help
  1627. Uses the command-line options passed by the boot loader. If
  1628. the boot loader doesn't provide any, the default kernel command
  1629. string provided in CMDLINE will be used.
  1630. config CMDLINE_EXTEND
  1631. bool "Extend bootloader kernel arguments"
  1632. help
  1633. The command-line arguments provided by the boot loader will be
  1634. appended to the default kernel command string.
  1635. config CMDLINE_FORCE
  1636. bool "Always use the default kernel command string"
  1637. help
  1638. Always use the default kernel command string, even if the boot
  1639. loader passes other arguments to the kernel.
  1640. This is useful if you cannot or don't want to change the
  1641. command-line options your boot loader passes to the kernel.
  1642. endchoice
  1643. config XIP_KERNEL
  1644. bool "Kernel Execute-In-Place from ROM"
  1645. depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
  1646. help
  1647. Execute-In-Place allows the kernel to run from non-volatile storage
  1648. directly addressable by the CPU, such as NOR flash. This saves RAM
  1649. space since the text section of the kernel is not loaded from flash
  1650. to RAM. Read-write sections, such as the data section and stack,
  1651. are still copied to RAM. The XIP kernel is not compressed since
  1652. it has to run directly from flash, so it will take more space to
  1653. store it. The flash address used to link the kernel object files,
  1654. and for storing it, is configuration dependent. Therefore, if you
  1655. say Y here, you must know the proper physical address where to
  1656. store the kernel image depending on your own flash memory usage.
  1657. Also note that the make target becomes "make xipImage" rather than
  1658. "make zImage" or "make Image". The final kernel binary to put in
  1659. ROM memory will be arch/arm/boot/xipImage.
  1660. If unsure, say N.
  1661. config XIP_PHYS_ADDR
  1662. hex "XIP Kernel Physical Location"
  1663. depends on XIP_KERNEL
  1664. default "0x00080000"
  1665. help
  1666. This is the physical address in your flash memory the kernel will
  1667. be linked for and stored to. This address is dependent on your
  1668. own flash usage.
  1669. config KEXEC
  1670. bool "Kexec system call (EXPERIMENTAL)"
  1671. depends on (!SMP || PM_SLEEP_SMP)
  1672. help
  1673. kexec is a system call that implements the ability to shutdown your
  1674. current kernel, and to start another kernel. It is like a reboot
  1675. but it is independent of the system firmware. And like a reboot
  1676. you can start any kernel with it, not just Linux.
  1677. It is an ongoing process to be certain the hardware in a machine
  1678. is properly shutdown, so do not be surprised if this code does not
  1679. initially work for you.
  1680. config ATAGS_PROC
  1681. bool "Export atags in procfs"
  1682. depends on ATAGS && KEXEC
  1683. default y
  1684. help
  1685. Should the atags used to boot the kernel be exported in an "atags"
  1686. file in procfs. Useful with kexec.
  1687. config CRASH_DUMP
  1688. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1689. help
  1690. Generate crash dump after being started by kexec. This should
  1691. be normally only set in special crash dump kernels which are
  1692. loaded in the main kernel with kexec-tools into a specially
  1693. reserved region and then later executed after a crash by
  1694. kdump/kexec. The crash dump kernel must be compiled to a
  1695. memory address not used by the main kernel
  1696. For more details see Documentation/kdump/kdump.txt
  1697. config AUTO_ZRELADDR
  1698. bool "Auto calculation of the decompressed kernel image address"
  1699. help
  1700. ZRELADDR is the physical address where the decompressed kernel
  1701. image will be placed. If AUTO_ZRELADDR is selected, the address
  1702. will be determined at run-time by masking the current IP with
  1703. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1704. from start of memory.
  1705. endmenu
  1706. menu "CPU Power Management"
  1707. source "drivers/cpufreq/Kconfig"
  1708. source "drivers/cpuidle/Kconfig"
  1709. endmenu
  1710. menu "Floating point emulation"
  1711. comment "At least one emulation must be selected"
  1712. config FPE_NWFPE
  1713. bool "NWFPE math emulation"
  1714. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1715. ---help---
  1716. Say Y to include the NWFPE floating point emulator in the kernel.
  1717. This is necessary to run most binaries. Linux does not currently
  1718. support floating point hardware so you need to say Y here even if
  1719. your machine has an FPA or floating point co-processor podule.
  1720. You may say N here if you are going to load the Acorn FPEmulator
  1721. early in the bootup.
  1722. config FPE_NWFPE_XP
  1723. bool "Support extended precision"
  1724. depends on FPE_NWFPE
  1725. help
  1726. Say Y to include 80-bit support in the kernel floating-point
  1727. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1728. Note that gcc does not generate 80-bit operations by default,
  1729. so in most cases this option only enlarges the size of the
  1730. floating point emulator without any good reason.
  1731. You almost surely want to say N here.
  1732. config FPE_FASTFPE
  1733. bool "FastFPE math emulation (EXPERIMENTAL)"
  1734. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1735. ---help---
  1736. Say Y here to include the FAST floating point emulator in the kernel.
  1737. This is an experimental much faster emulator which now also has full
  1738. precision for the mantissa. It does not support any exceptions.
  1739. It is very simple, and approximately 3-6 times faster than NWFPE.
  1740. It should be sufficient for most programs. It may be not suitable
  1741. for scientific calculations, but you have to check this for yourself.
  1742. If you do not feel you need a faster FP emulation you should better
  1743. choose NWFPE.
  1744. config VFP
  1745. bool "VFP-format floating point maths"
  1746. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1747. help
  1748. Say Y to include VFP support code in the kernel. This is needed
  1749. if your hardware includes a VFP unit.
  1750. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1751. release notes and additional status information.
  1752. Say N if your target does not have VFP hardware.
  1753. config VFPv3
  1754. bool
  1755. depends on VFP
  1756. default y if CPU_V7
  1757. config NEON
  1758. bool "Advanced SIMD (NEON) Extension support"
  1759. depends on VFPv3 && CPU_V7
  1760. help
  1761. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1762. Extension.
  1763. config KERNEL_MODE_NEON
  1764. bool "Support for NEON in kernel mode"
  1765. depends on NEON && AEABI
  1766. help
  1767. Say Y to include support for NEON in kernel mode.
  1768. endmenu
  1769. menu "Userspace binary formats"
  1770. source "fs/Kconfig.binfmt"
  1771. config ARTHUR
  1772. tristate "RISC OS personality"
  1773. depends on !AEABI
  1774. help
  1775. Say Y here to include the kernel code necessary if you want to run
  1776. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1777. experimental; if this sounds frightening, say N and sleep in peace.
  1778. You can also say M here to compile this support as a module (which
  1779. will be called arthur).
  1780. endmenu
  1781. menu "Power management options"
  1782. source "kernel/power/Kconfig"
  1783. config ARCH_SUSPEND_POSSIBLE
  1784. depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
  1785. CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1786. def_bool y
  1787. config ARM_CPU_SUSPEND
  1788. def_bool PM_SLEEP
  1789. config ARCH_HIBERNATION_POSSIBLE
  1790. bool
  1791. depends on MMU
  1792. default y if ARCH_SUSPEND_POSSIBLE
  1793. endmenu
  1794. source "net/Kconfig"
  1795. source "drivers/Kconfig"
  1796. source "fs/Kconfig"
  1797. source "arch/arm/Kconfig.debug"
  1798. source "security/Kconfig"
  1799. source "crypto/Kconfig"
  1800. source "lib/Kconfig"
  1801. source "arch/arm/kvm/Kconfig"