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_ALLOCATOR
  18. select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
  19. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  20. select GENERIC_IDLE_POLL_SETUP
  21. select GENERIC_IRQ_PROBE
  22. select GENERIC_IRQ_SHOW
  23. select GENERIC_PCI_IOMAP
  24. select GENERIC_SCHED_CLOCK
  25. select GENERIC_SMP_IDLE_THREAD
  26. select GENERIC_STRNCPY_FROM_USER
  27. select GENERIC_STRNLEN_USER
  28. select HANDLE_DOMAIN_IRQ
  29. select HARDIRQS_SW_RESEND
  30. select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
  31. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  32. select HAVE_ARCH_KGDB
  33. select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
  34. select HAVE_ARCH_TRACEHOOK
  35. select HAVE_BPF_JIT
  36. select HAVE_CC_STACKPROTECTOR
  37. select HAVE_CONTEXT_TRACKING
  38. select HAVE_C_RECORDMCOUNT
  39. select HAVE_DEBUG_KMEMLEAK
  40. select HAVE_DMA_API_DEBUG
  41. select HAVE_DMA_ATTRS
  42. select HAVE_DMA_CONTIGUOUS if MMU
  43. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  44. select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
  45. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  46. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  47. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  48. select HAVE_GENERIC_DMA_COHERENT
  49. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  50. select HAVE_IDE if PCI || ISA || PCMCIA
  51. select HAVE_IRQ_TIME_ACCOUNTING
  52. select HAVE_KERNEL_GZIP
  53. select HAVE_KERNEL_LZ4
  54. select HAVE_KERNEL_LZMA
  55. select HAVE_KERNEL_LZO
  56. select HAVE_KERNEL_XZ
  57. select HAVE_KPROBES if !XIP_KERNEL
  58. select HAVE_KRETPROBES if (HAVE_KPROBES)
  59. select HAVE_MEMBLOCK
  60. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  61. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  62. select HAVE_PERF_EVENTS
  63. select HAVE_PERF_REGS
  64. select HAVE_PERF_USER_STACK_DUMP
  65. select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
  66. select HAVE_REGS_AND_STACK_ACCESS_API
  67. select HAVE_SYSCALL_TRACEPOINTS
  68. select HAVE_UID16
  69. select HAVE_VIRT_CPU_ACCOUNTING_GEN
  70. select IRQ_FORCED_THREADING
  71. select MODULES_USE_ELF_REL
  72. select NO_BOOTMEM
  73. select OLD_SIGACTION
  74. select OLD_SIGSUSPEND3
  75. select PERF_USE_VMALLOC
  76. select RTC_LIB
  77. select SYS_SUPPORTS_APM_EMULATION
  78. # Above selects are sorted alphabetically; please add new ones
  79. # according to that. Thanks.
  80. help
  81. The ARM series is a line of low-power-consumption RISC chip designs
  82. licensed by ARM Ltd and targeted at embedded applications and
  83. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  84. manufactured, but legacy ARM-based PC hardware remains popular in
  85. Europe. There is an ARM Linux project with a web page at
  86. <http://www.arm.linux.org.uk/>.
  87. config ARM_HAS_SG_CHAIN
  88. select ARCH_HAS_SG_CHAIN
  89. bool
  90. config NEED_SG_DMA_LENGTH
  91. bool
  92. config ARM_DMA_USE_IOMMU
  93. bool
  94. select ARM_HAS_SG_CHAIN
  95. select NEED_SG_DMA_LENGTH
  96. if ARM_DMA_USE_IOMMU
  97. config ARM_DMA_IOMMU_ALIGNMENT
  98. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  99. range 4 9
  100. default 8
  101. help
  102. DMA mapping framework by default aligns all buffers to the smallest
  103. PAGE_SIZE order which is greater than or equal to the requested buffer
  104. size. This works well for buffers up to a few hundreds kilobytes, but
  105. for larger buffers it just a waste of address space. Drivers which has
  106. relatively small addressing window (like 64Mib) might run out of
  107. virtual space with just a few allocations.
  108. With this parameter you can specify the maximum PAGE_SIZE order for
  109. DMA IOMMU buffers. Larger buffers will be aligned only to this
  110. specified order. The order is expressed as a power of two multiplied
  111. by the PAGE_SIZE.
  112. endif
  113. config MIGHT_HAVE_PCI
  114. bool
  115. config SYS_SUPPORTS_APM_EMULATION
  116. bool
  117. config HAVE_TCM
  118. bool
  119. select GENERIC_ALLOCATOR
  120. config HAVE_PROC_CPU
  121. bool
  122. config NO_IOPORT_MAP
  123. bool
  124. config EISA
  125. bool
  126. ---help---
  127. The Extended Industry Standard Architecture (EISA) bus was
  128. developed as an open alternative to the IBM MicroChannel bus.
  129. The EISA bus provided some of the features of the IBM MicroChannel
  130. bus while maintaining backward compatibility with cards made for
  131. the older ISA bus. The EISA bus saw limited use between 1988 and
  132. 1995 when it was made obsolete by the PCI bus.
  133. Say Y here if you are building a kernel for an EISA-based machine.
  134. Otherwise, say N.
  135. config SBUS
  136. bool
  137. config STACKTRACE_SUPPORT
  138. bool
  139. default y
  140. config HAVE_LATENCYTOP_SUPPORT
  141. bool
  142. depends on !SMP
  143. default y
  144. config LOCKDEP_SUPPORT
  145. bool
  146. default y
  147. config TRACE_IRQFLAGS_SUPPORT
  148. bool
  149. default y
  150. config RWSEM_XCHGADD_ALGORITHM
  151. bool
  152. default y
  153. config ARCH_HAS_ILOG2_U32
  154. bool
  155. config ARCH_HAS_ILOG2_U64
  156. bool
  157. config ARCH_HAS_BANDGAP
  158. bool
  159. config GENERIC_HWEIGHT
  160. bool
  161. default y
  162. config GENERIC_CALIBRATE_DELAY
  163. bool
  164. default y
  165. config ARCH_MAY_HAVE_PC_FDC
  166. bool
  167. config ZONE_DMA
  168. bool
  169. config NEED_DMA_MAP_STATE
  170. def_bool y
  171. config ARCH_SUPPORTS_UPROBES
  172. def_bool y
  173. config ARCH_HAS_DMA_SET_COHERENT_MASK
  174. bool
  175. config GENERIC_ISA_DMA
  176. bool
  177. config FIQ
  178. bool
  179. config NEED_RET_TO_USER
  180. bool
  181. config ARCH_MTD_XIP
  182. bool
  183. config VECTORS_BASE
  184. hex
  185. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  186. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  187. default 0x00000000
  188. help
  189. The base address of exception vectors. This must be two pages
  190. in size.
  191. config ARM_PATCH_PHYS_VIRT
  192. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  193. default y
  194. depends on !XIP_KERNEL && MMU
  195. depends on !ARCH_REALVIEW || !SPARSEMEM
  196. help
  197. Patch phys-to-virt and virt-to-phys translation functions at
  198. boot and module load time according to the position of the
  199. kernel in system memory.
  200. This can only be used with non-XIP MMU kernels where the base
  201. of physical memory is at a 16MB boundary.
  202. Only disable this option if you know that you do not require
  203. this feature (eg, building a kernel for a single machine) and
  204. you need to shrink the kernel to the minimal size.
  205. config NEED_MACH_IO_H
  206. bool
  207. help
  208. Select this when mach/io.h is required to provide special
  209. definitions for this platform. The need for mach/io.h should
  210. be avoided when possible.
  211. config NEED_MACH_MEMORY_H
  212. bool
  213. help
  214. Select this when mach/memory.h is required to provide special
  215. definitions for this platform. The need for mach/memory.h should
  216. be avoided when possible.
  217. config PHYS_OFFSET
  218. hex "Physical address of main memory" if MMU
  219. depends on !ARM_PATCH_PHYS_VIRT
  220. default DRAM_BASE if !MMU
  221. default 0x00000000 if ARCH_EBSA110 || \
  222. EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
  223. ARCH_FOOTBRIDGE || \
  224. ARCH_INTEGRATOR || \
  225. ARCH_IOP13XX || \
  226. ARCH_KS8695 || \
  227. (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
  228. default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
  229. default 0x20000000 if ARCH_S5PV210
  230. default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
  231. default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
  232. default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
  233. default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
  234. default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
  235. help
  236. Please provide the physical address corresponding to the
  237. location of main memory in your system.
  238. config GENERIC_BUG
  239. def_bool y
  240. depends on BUG
  241. source "init/Kconfig"
  242. source "kernel/Kconfig.freezer"
  243. menu "System Type"
  244. config MMU
  245. bool "MMU-based Paged Memory Management Support"
  246. default y
  247. help
  248. Select if you want MMU-based virtualised addressing space
  249. support by paged memory management. If unsure, say 'Y'.
  250. #
  251. # The "ARM system type" choice list is ordered alphabetically by option
  252. # text. Please add new entries in the option alphabetic order.
  253. #
  254. choice
  255. prompt "ARM system type"
  256. default ARCH_VERSATILE if !MMU
  257. default ARCH_MULTIPLATFORM if MMU
  258. config ARCH_MULTIPLATFORM
  259. bool "Allow multiple platforms to be selected"
  260. depends on MMU
  261. select ARCH_WANT_OPTIONAL_GPIOLIB
  262. select ARM_HAS_SG_CHAIN
  263. select ARM_PATCH_PHYS_VIRT
  264. select AUTO_ZRELADDR
  265. select CLKSRC_OF
  266. select COMMON_CLK
  267. select GENERIC_CLOCKEVENTS
  268. select MIGHT_HAVE_PCI
  269. select MULTI_IRQ_HANDLER
  270. select SPARSE_IRQ
  271. select USE_OF
  272. config ARCH_INTEGRATOR
  273. bool "ARM Ltd. Integrator family"
  274. select ARM_AMBA
  275. select ARM_PATCH_PHYS_VIRT if MMU
  276. select AUTO_ZRELADDR
  277. select COMMON_CLK
  278. select COMMON_CLK_VERSATILE
  279. select GENERIC_CLOCKEVENTS
  280. select HAVE_TCM
  281. select ICST
  282. select MULTI_IRQ_HANDLER
  283. select PLAT_VERSATILE
  284. select SPARSE_IRQ
  285. select USE_OF
  286. select VERSATILE_FPGA_IRQ
  287. help
  288. Support for ARM's Integrator platform.
  289. config ARCH_REALVIEW
  290. bool "ARM Ltd. RealView family"
  291. select ARCH_WANT_OPTIONAL_GPIOLIB
  292. select ARM_AMBA
  293. select ARM_TIMER_SP804
  294. select COMMON_CLK
  295. select COMMON_CLK_VERSATILE
  296. select GENERIC_CLOCKEVENTS
  297. select GPIO_PL061 if GPIOLIB
  298. select ICST
  299. select NEED_MACH_MEMORY_H
  300. select PLAT_VERSATILE
  301. help
  302. This enables support for ARM Ltd RealView boards.
  303. config ARCH_VERSATILE
  304. bool "ARM Ltd. Versatile family"
  305. select ARCH_WANT_OPTIONAL_GPIOLIB
  306. select ARM_AMBA
  307. select ARM_TIMER_SP804
  308. select ARM_VIC
  309. select CLKDEV_LOOKUP
  310. select GENERIC_CLOCKEVENTS
  311. select HAVE_MACH_CLKDEV
  312. select ICST
  313. select PLAT_VERSATILE
  314. select PLAT_VERSATILE_CLOCK
  315. select VERSATILE_FPGA_IRQ
  316. help
  317. This enables support for ARM Ltd Versatile board.
  318. config ARCH_AT91
  319. bool "Atmel AT91"
  320. select ARCH_REQUIRE_GPIOLIB
  321. select CLKDEV_LOOKUP
  322. select IRQ_DOMAIN
  323. select NEED_MACH_IO_H if PCCARD
  324. select PINCTRL
  325. select PINCTRL_AT91 if USE_OF
  326. help
  327. This enables support for systems based on Atmel
  328. AT91RM9200 and AT91SAM9* processors.
  329. config ARCH_CLPS711X
  330. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  331. select ARCH_REQUIRE_GPIOLIB
  332. select AUTO_ZRELADDR
  333. select CLKSRC_MMIO
  334. select COMMON_CLK
  335. select CPU_ARM720T
  336. select GENERIC_CLOCKEVENTS
  337. select MFD_SYSCON
  338. select SOC_BUS
  339. help
  340. Support for Cirrus Logic 711x/721x/731x based boards.
  341. config ARCH_GEMINI
  342. bool "Cortina Systems Gemini"
  343. select ARCH_REQUIRE_GPIOLIB
  344. select CLKSRC_MMIO
  345. select CPU_FA526
  346. select GENERIC_CLOCKEVENTS
  347. help
  348. Support for the Cortina Systems Gemini family SoCs
  349. config ARCH_EBSA110
  350. bool "EBSA-110"
  351. select ARCH_USES_GETTIMEOFFSET
  352. select CPU_SA110
  353. select ISA
  354. select NEED_MACH_IO_H
  355. select NEED_MACH_MEMORY_H
  356. select NO_IOPORT_MAP
  357. help
  358. This is an evaluation board for the StrongARM processor available
  359. from Digital. It has limited hardware on-board, including an
  360. Ethernet interface, two PCMCIA sockets, two serial ports and a
  361. parallel port.
  362. config ARCH_EFM32
  363. bool "Energy Micro efm32"
  364. depends on !MMU
  365. select ARCH_REQUIRE_GPIOLIB
  366. select ARM_NVIC
  367. select AUTO_ZRELADDR
  368. select CLKSRC_OF
  369. select COMMON_CLK
  370. select CPU_V7M
  371. select GENERIC_CLOCKEVENTS
  372. select NO_DMA
  373. select NO_IOPORT_MAP
  374. select SPARSE_IRQ
  375. select USE_OF
  376. help
  377. Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
  378. processors.
  379. config ARCH_EP93XX
  380. bool "EP93xx-based"
  381. select ARCH_HAS_HOLES_MEMORYMODEL
  382. select ARCH_REQUIRE_GPIOLIB
  383. select ARCH_USES_GETTIMEOFFSET
  384. select ARM_AMBA
  385. select ARM_VIC
  386. select CLKDEV_LOOKUP
  387. select CPU_ARM920T
  388. help
  389. This enables support for the Cirrus EP93xx series of CPUs.
  390. config ARCH_FOOTBRIDGE
  391. bool "FootBridge"
  392. select CPU_SA110
  393. select FOOTBRIDGE
  394. select GENERIC_CLOCKEVENTS
  395. select HAVE_IDE
  396. select NEED_MACH_IO_H if !MMU
  397. select NEED_MACH_MEMORY_H
  398. help
  399. Support for systems based on the DC21285 companion chip
  400. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  401. config ARCH_NETX
  402. bool "Hilscher NetX based"
  403. select ARM_VIC
  404. select CLKSRC_MMIO
  405. select CPU_ARM926T
  406. select GENERIC_CLOCKEVENTS
  407. help
  408. This enables support for systems based on the Hilscher NetX Soc
  409. config ARCH_IOP13XX
  410. bool "IOP13xx-based"
  411. depends on MMU
  412. select CPU_XSC3
  413. select NEED_MACH_MEMORY_H
  414. select NEED_RET_TO_USER
  415. select PCI
  416. select PLAT_IOP
  417. select VMSPLIT_1G
  418. select SPARSE_IRQ
  419. help
  420. Support for Intel's IOP13XX (XScale) family of processors.
  421. config ARCH_IOP32X
  422. bool "IOP32x-based"
  423. depends on MMU
  424. select ARCH_REQUIRE_GPIOLIB
  425. select CPU_XSCALE
  426. select GPIO_IOP
  427. select NEED_RET_TO_USER
  428. select PCI
  429. select PLAT_IOP
  430. help
  431. Support for Intel's 80219 and IOP32X (XScale) family of
  432. processors.
  433. config ARCH_IOP33X
  434. bool "IOP33x-based"
  435. depends on MMU
  436. select ARCH_REQUIRE_GPIOLIB
  437. select CPU_XSCALE
  438. select GPIO_IOP
  439. select NEED_RET_TO_USER
  440. select PCI
  441. select PLAT_IOP
  442. help
  443. Support for Intel's IOP33X (XScale) family of processors.
  444. config ARCH_IXP4XX
  445. bool "IXP4xx-based"
  446. depends on MMU
  447. select ARCH_HAS_DMA_SET_COHERENT_MASK
  448. select ARCH_REQUIRE_GPIOLIB
  449. select ARCH_SUPPORTS_BIG_ENDIAN
  450. select CLKSRC_MMIO
  451. select CPU_XSCALE
  452. select DMABOUNCE if PCI
  453. select GENERIC_CLOCKEVENTS
  454. select MIGHT_HAVE_PCI
  455. select NEED_MACH_IO_H
  456. select USB_EHCI_BIG_ENDIAN_DESC
  457. select USB_EHCI_BIG_ENDIAN_MMIO
  458. help
  459. Support for Intel's IXP4XX (XScale) family of processors.
  460. config ARCH_DOVE
  461. bool "Marvell Dove"
  462. select ARCH_REQUIRE_GPIOLIB
  463. select CPU_PJ4
  464. select GENERIC_CLOCKEVENTS
  465. select MIGHT_HAVE_PCI
  466. select MVEBU_MBUS
  467. select PINCTRL
  468. select PINCTRL_DOVE
  469. select PLAT_ORION_LEGACY
  470. help
  471. Support for the Marvell Dove SoC 88AP510
  472. config ARCH_MV78XX0
  473. bool "Marvell MV78xx0"
  474. select ARCH_REQUIRE_GPIOLIB
  475. select CPU_FEROCEON
  476. select GENERIC_CLOCKEVENTS
  477. select MVEBU_MBUS
  478. select PCI
  479. select PLAT_ORION_LEGACY
  480. help
  481. Support for the following Marvell MV78xx0 series SoCs:
  482. MV781x0, MV782x0.
  483. config ARCH_ORION5X
  484. bool "Marvell Orion"
  485. depends on MMU
  486. select ARCH_REQUIRE_GPIOLIB
  487. select CPU_FEROCEON
  488. select GENERIC_CLOCKEVENTS
  489. select MVEBU_MBUS
  490. select PCI
  491. select PLAT_ORION_LEGACY
  492. help
  493. Support for the following Marvell Orion 5x series SoCs:
  494. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  495. Orion-2 (5281), Orion-1-90 (6183).
  496. config ARCH_MMP
  497. bool "Marvell PXA168/910/MMP2"
  498. depends on MMU
  499. select ARCH_REQUIRE_GPIOLIB
  500. select CLKDEV_LOOKUP
  501. select GENERIC_ALLOCATOR
  502. select GENERIC_CLOCKEVENTS
  503. select GPIO_PXA
  504. select IRQ_DOMAIN
  505. select MULTI_IRQ_HANDLER
  506. select PINCTRL
  507. select PLAT_PXA
  508. select SPARSE_IRQ
  509. help
  510. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  511. config ARCH_KS8695
  512. bool "Micrel/Kendin KS8695"
  513. select ARCH_REQUIRE_GPIOLIB
  514. select CLKSRC_MMIO
  515. select CPU_ARM922T
  516. select GENERIC_CLOCKEVENTS
  517. select NEED_MACH_MEMORY_H
  518. help
  519. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  520. System-on-Chip devices.
  521. config ARCH_W90X900
  522. bool "Nuvoton W90X900 CPU"
  523. select ARCH_REQUIRE_GPIOLIB
  524. select CLKDEV_LOOKUP
  525. select CLKSRC_MMIO
  526. select CPU_ARM926T
  527. select GENERIC_CLOCKEVENTS
  528. help
  529. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  530. At present, the w90x900 has been renamed nuc900, regarding
  531. the ARM series product line, you can login the following
  532. link address to know more.
  533. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  534. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  535. config ARCH_LPC32XX
  536. bool "NXP LPC32XX"
  537. select ARCH_REQUIRE_GPIOLIB
  538. select ARM_AMBA
  539. select CLKDEV_LOOKUP
  540. select CLKSRC_MMIO
  541. select CPU_ARM926T
  542. select GENERIC_CLOCKEVENTS
  543. select HAVE_IDE
  544. select USE_OF
  545. help
  546. Support for the NXP LPC32XX family of processors
  547. config ARCH_PXA
  548. bool "PXA2xx/PXA3xx-based"
  549. depends on MMU
  550. select ARCH_MTD_XIP
  551. select ARCH_REQUIRE_GPIOLIB
  552. select ARM_CPU_SUSPEND if PM
  553. select AUTO_ZRELADDR
  554. select CLKDEV_LOOKUP
  555. select CLKSRC_MMIO
  556. select CLKSRC_OF
  557. select GENERIC_CLOCKEVENTS
  558. select GPIO_PXA
  559. select HAVE_IDE
  560. select MULTI_IRQ_HANDLER
  561. select PLAT_PXA
  562. select SPARSE_IRQ
  563. help
  564. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  565. config ARCH_MSM
  566. bool "Qualcomm MSM (non-multiplatform)"
  567. select ARCH_REQUIRE_GPIOLIB
  568. select COMMON_CLK
  569. select GENERIC_CLOCKEVENTS
  570. help
  571. Support for Qualcomm MSM/QSD based systems. This runs on the
  572. apps processor of the MSM/QSD and depends on a shared memory
  573. interface to the modem processor which runs the baseband
  574. stack and controls some vital subsystems
  575. (clock and power control, etc).
  576. config ARCH_SHMOBILE_LEGACY
  577. bool "Renesas ARM SoCs (non-multiplatform)"
  578. select ARCH_SHMOBILE
  579. select ARM_PATCH_PHYS_VIRT if MMU
  580. select CLKDEV_LOOKUP
  581. select CPU_V7
  582. select GENERIC_CLOCKEVENTS
  583. select HAVE_ARM_SCU if SMP
  584. select HAVE_ARM_TWD if SMP
  585. select HAVE_MACH_CLKDEV
  586. select HAVE_SMP
  587. select MIGHT_HAVE_CACHE_L2X0
  588. select MULTI_IRQ_HANDLER
  589. select NO_IOPORT_MAP
  590. select PINCTRL
  591. select PM_GENERIC_DOMAINS if PM
  592. select SH_CLK_CPG
  593. select SPARSE_IRQ
  594. help
  595. Support for Renesas ARM SoC platforms using a non-multiplatform
  596. kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
  597. and RZ families.
  598. config ARCH_RPC
  599. bool "RiscPC"
  600. select ARCH_ACORN
  601. select ARCH_MAY_HAVE_PC_FDC
  602. select ARCH_SPARSEMEM_ENABLE
  603. select ARCH_USES_GETTIMEOFFSET
  604. select CPU_SA110
  605. select FIQ
  606. select HAVE_IDE
  607. select HAVE_PATA_PLATFORM
  608. select ISA_DMA_API
  609. select NEED_MACH_IO_H
  610. select NEED_MACH_MEMORY_H
  611. select NO_IOPORT_MAP
  612. select VIRT_TO_BUS
  613. help
  614. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  615. CD-ROM interface, serial and parallel port, and the floppy drive.
  616. config ARCH_SA1100
  617. bool "SA1100-based"
  618. select ARCH_MTD_XIP
  619. select ARCH_REQUIRE_GPIOLIB
  620. select ARCH_SPARSEMEM_ENABLE
  621. select CLKDEV_LOOKUP
  622. select CLKSRC_MMIO
  623. select CPU_FREQ
  624. select CPU_SA1100
  625. select GENERIC_CLOCKEVENTS
  626. select HAVE_IDE
  627. select ISA
  628. select NEED_MACH_MEMORY_H
  629. select SPARSE_IRQ
  630. help
  631. Support for StrongARM 11x0 based boards.
  632. config ARCH_S3C24XX
  633. bool "Samsung S3C24XX SoCs"
  634. select ARCH_REQUIRE_GPIOLIB
  635. select ATAGS
  636. select CLKDEV_LOOKUP
  637. select CLKSRC_SAMSUNG_PWM
  638. select GENERIC_CLOCKEVENTS
  639. select GPIO_SAMSUNG
  640. select HAVE_S3C2410_I2C if I2C
  641. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  642. select HAVE_S3C_RTC if RTC_CLASS
  643. select MULTI_IRQ_HANDLER
  644. select NEED_MACH_IO_H
  645. select SAMSUNG_ATAGS
  646. help
  647. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  648. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  649. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  650. Samsung SMDK2410 development board (and derivatives).
  651. config ARCH_S3C64XX
  652. bool "Samsung S3C64XX"
  653. select ARCH_REQUIRE_GPIOLIB
  654. select ARM_AMBA
  655. select ARM_VIC
  656. select ATAGS
  657. select CLKDEV_LOOKUP
  658. select CLKSRC_SAMSUNG_PWM
  659. select COMMON_CLK_SAMSUNG
  660. select CPU_V6K
  661. select GENERIC_CLOCKEVENTS
  662. select GPIO_SAMSUNG
  663. select HAVE_S3C2410_I2C if I2C
  664. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  665. select HAVE_TCM
  666. select NO_IOPORT_MAP
  667. select PLAT_SAMSUNG
  668. select PM_GENERIC_DOMAINS if PM
  669. select S3C_DEV_NAND
  670. select S3C_GPIO_TRACK
  671. select SAMSUNG_ATAGS
  672. select SAMSUNG_WAKEMASK
  673. select SAMSUNG_WDT_RESET
  674. help
  675. Samsung S3C64XX series based systems
  676. config ARCH_DAVINCI
  677. bool "TI DaVinci"
  678. select ARCH_HAS_HOLES_MEMORYMODEL
  679. select ARCH_REQUIRE_GPIOLIB
  680. select CLKDEV_LOOKUP
  681. select GENERIC_ALLOCATOR
  682. select GENERIC_CLOCKEVENTS
  683. select GENERIC_IRQ_CHIP
  684. select HAVE_IDE
  685. select TI_PRIV_EDMA
  686. select USE_OF
  687. select ZONE_DMA
  688. help
  689. Support for TI's DaVinci platform.
  690. config ARCH_OMAP1
  691. bool "TI OMAP1"
  692. depends on MMU
  693. select ARCH_HAS_HOLES_MEMORYMODEL
  694. select ARCH_OMAP
  695. select ARCH_REQUIRE_GPIOLIB
  696. select CLKDEV_LOOKUP
  697. select CLKSRC_MMIO
  698. select GENERIC_CLOCKEVENTS
  699. select GENERIC_IRQ_CHIP
  700. select HAVE_IDE
  701. select IRQ_DOMAIN
  702. select NEED_MACH_IO_H if PCCARD
  703. select NEED_MACH_MEMORY_H
  704. help
  705. Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
  706. endchoice
  707. menu "Multiple platform selection"
  708. depends on ARCH_MULTIPLATFORM
  709. comment "CPU Core family selection"
  710. config ARCH_MULTI_V4
  711. bool "ARMv4 based platforms (FA526)"
  712. depends on !ARCH_MULTI_V6_V7
  713. select ARCH_MULTI_V4_V5
  714. select CPU_FA526
  715. config ARCH_MULTI_V4T
  716. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  717. depends on !ARCH_MULTI_V6_V7
  718. select ARCH_MULTI_V4_V5
  719. select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
  720. CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
  721. CPU_ARM925T || CPU_ARM940T)
  722. config ARCH_MULTI_V5
  723. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  724. depends on !ARCH_MULTI_V6_V7
  725. select ARCH_MULTI_V4_V5
  726. select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
  727. CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
  728. CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
  729. config ARCH_MULTI_V4_V5
  730. bool
  731. config ARCH_MULTI_V6
  732. bool "ARMv6 based platforms (ARM11)"
  733. select ARCH_MULTI_V6_V7
  734. select CPU_V6K
  735. config ARCH_MULTI_V7
  736. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  737. default y
  738. select ARCH_MULTI_V6_V7
  739. select CPU_V7
  740. select HAVE_SMP
  741. config ARCH_MULTI_V6_V7
  742. bool
  743. select MIGHT_HAVE_CACHE_L2X0
  744. config ARCH_MULTI_CPU_AUTO
  745. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  746. select ARCH_MULTI_V5
  747. endmenu
  748. config ARCH_VIRT
  749. bool "Dummy Virtual Machine" if ARCH_MULTI_V7
  750. select ARM_AMBA
  751. select ARM_GIC
  752. select ARM_PSCI
  753. select HAVE_ARM_ARCH_TIMER
  754. #
  755. # This is sorted alphabetically by mach-* pathname. However, plat-*
  756. # Kconfigs may be included either alphabetically (according to the
  757. # plat- suffix) or along side the corresponding mach-* source.
  758. #
  759. source "arch/arm/mach-mvebu/Kconfig"
  760. source "arch/arm/mach-at91/Kconfig"
  761. source "arch/arm/mach-axxia/Kconfig"
  762. source "arch/arm/mach-bcm/Kconfig"
  763. source "arch/arm/mach-berlin/Kconfig"
  764. source "arch/arm/mach-clps711x/Kconfig"
  765. source "arch/arm/mach-cns3xxx/Kconfig"
  766. source "arch/arm/mach-davinci/Kconfig"
  767. source "arch/arm/mach-dove/Kconfig"
  768. source "arch/arm/mach-ep93xx/Kconfig"
  769. source "arch/arm/mach-footbridge/Kconfig"
  770. source "arch/arm/mach-gemini/Kconfig"
  771. source "arch/arm/mach-highbank/Kconfig"
  772. source "arch/arm/mach-hisi/Kconfig"
  773. source "arch/arm/mach-integrator/Kconfig"
  774. source "arch/arm/mach-iop32x/Kconfig"
  775. source "arch/arm/mach-iop33x/Kconfig"
  776. source "arch/arm/mach-iop13xx/Kconfig"
  777. source "arch/arm/mach-ixp4xx/Kconfig"
  778. source "arch/arm/mach-keystone/Kconfig"
  779. source "arch/arm/mach-ks8695/Kconfig"
  780. source "arch/arm/mach-meson/Kconfig"
  781. source "arch/arm/mach-msm/Kconfig"
  782. source "arch/arm/mach-moxart/Kconfig"
  783. source "arch/arm/mach-mv78xx0/Kconfig"
  784. source "arch/arm/mach-imx/Kconfig"
  785. source "arch/arm/mach-mediatek/Kconfig"
  786. source "arch/arm/mach-mxs/Kconfig"
  787. source "arch/arm/mach-netx/Kconfig"
  788. source "arch/arm/mach-nomadik/Kconfig"
  789. source "arch/arm/mach-nspire/Kconfig"
  790. source "arch/arm/plat-omap/Kconfig"
  791. source "arch/arm/mach-omap1/Kconfig"
  792. source "arch/arm/mach-omap2/Kconfig"
  793. source "arch/arm/mach-orion5x/Kconfig"
  794. source "arch/arm/mach-picoxcell/Kconfig"
  795. source "arch/arm/mach-pxa/Kconfig"
  796. source "arch/arm/plat-pxa/Kconfig"
  797. source "arch/arm/mach-mmp/Kconfig"
  798. source "arch/arm/mach-qcom/Kconfig"
  799. source "arch/arm/mach-realview/Kconfig"
  800. source "arch/arm/mach-rockchip/Kconfig"
  801. source "arch/arm/mach-sa1100/Kconfig"
  802. source "arch/arm/mach-socfpga/Kconfig"
  803. source "arch/arm/mach-spear/Kconfig"
  804. source "arch/arm/mach-sti/Kconfig"
  805. source "arch/arm/mach-s3c24xx/Kconfig"
  806. source "arch/arm/mach-s3c64xx/Kconfig"
  807. source "arch/arm/mach-s5pv210/Kconfig"
  808. source "arch/arm/mach-exynos/Kconfig"
  809. source "arch/arm/plat-samsung/Kconfig"
  810. source "arch/arm/mach-shmobile/Kconfig"
  811. source "arch/arm/mach-sunxi/Kconfig"
  812. source "arch/arm/mach-prima2/Kconfig"
  813. source "arch/arm/mach-tegra/Kconfig"
  814. source "arch/arm/mach-u300/Kconfig"
  815. source "arch/arm/mach-ux500/Kconfig"
  816. source "arch/arm/mach-versatile/Kconfig"
  817. source "arch/arm/mach-vexpress/Kconfig"
  818. source "arch/arm/plat-versatile/Kconfig"
  819. source "arch/arm/mach-vt8500/Kconfig"
  820. source "arch/arm/mach-w90x900/Kconfig"
  821. source "arch/arm/mach-zynq/Kconfig"
  822. # Definitions to make life easier
  823. config ARCH_ACORN
  824. bool
  825. config PLAT_IOP
  826. bool
  827. select GENERIC_CLOCKEVENTS
  828. config PLAT_ORION
  829. bool
  830. select CLKSRC_MMIO
  831. select COMMON_CLK
  832. select GENERIC_IRQ_CHIP
  833. select IRQ_DOMAIN
  834. config PLAT_ORION_LEGACY
  835. bool
  836. select PLAT_ORION
  837. config PLAT_PXA
  838. bool
  839. config PLAT_VERSATILE
  840. bool
  841. config ARM_TIMER_SP804
  842. bool
  843. select CLKSRC_MMIO
  844. select CLKSRC_OF if OF
  845. source "arch/arm/firmware/Kconfig"
  846. source arch/arm/mm/Kconfig
  847. config IWMMXT
  848. bool "Enable iWMMXt support"
  849. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
  850. default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
  851. help
  852. Enable support for iWMMXt context switching at run time if
  853. running on a CPU that supports it.
  854. config MULTI_IRQ_HANDLER
  855. bool
  856. help
  857. Allow each machine to specify it's own IRQ handler at run time.
  858. if !MMU
  859. source "arch/arm/Kconfig-nommu"
  860. endif
  861. config PJ4B_ERRATA_4742
  862. bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
  863. depends on CPU_PJ4B && MACH_ARMADA_370
  864. default y
  865. help
  866. When coming out of either a Wait for Interrupt (WFI) or a Wait for
  867. Event (WFE) IDLE states, a specific timing sensitivity exists between
  868. the retiring WFI/WFE instructions and the newly issued subsequent
  869. instructions. This sensitivity can result in a CPU hang scenario.
  870. Workaround:
  871. The software must insert either a Data Synchronization Barrier (DSB)
  872. or Data Memory Barrier (DMB) command immediately after the WFI/WFE
  873. instruction
  874. config ARM_ERRATA_326103
  875. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  876. depends on CPU_V6
  877. help
  878. Executing a SWP instruction to read-only memory does not set bit 11
  879. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  880. treat the access as a read, preventing a COW from occurring and
  881. causing the faulting task to livelock.
  882. config ARM_ERRATA_411920
  883. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  884. depends on CPU_V6 || CPU_V6K
  885. help
  886. Invalidation of the Instruction Cache operation can
  887. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  888. It does not affect the MPCore. This option enables the ARM Ltd.
  889. recommended workaround.
  890. config ARM_ERRATA_430973
  891. bool "ARM errata: Stale prediction on replaced interworking branch"
  892. depends on CPU_V7
  893. help
  894. This option enables the workaround for the 430973 Cortex-A8
  895. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  896. interworking branch is replaced with another code sequence at the
  897. same virtual address, whether due to self-modifying code or virtual
  898. to physical address re-mapping, Cortex-A8 does not recover from the
  899. stale interworking branch prediction. This results in Cortex-A8
  900. executing the new code sequence in the incorrect ARM or Thumb state.
  901. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  902. and also flushes the branch target cache at every context switch.
  903. Note that setting specific bits in the ACTLR register may not be
  904. available in non-secure mode.
  905. config ARM_ERRATA_458693
  906. bool "ARM errata: Processor deadlock when a false hazard is created"
  907. depends on CPU_V7
  908. depends on !ARCH_MULTIPLATFORM
  909. help
  910. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  911. erratum. For very specific sequences of memory operations, it is
  912. possible for a hazard condition intended for a cache line to instead
  913. be incorrectly associated with a different cache line. This false
  914. hazard might then cause a processor deadlock. The workaround enables
  915. the L1 caching of the NEON accesses and disables the PLD instruction
  916. in the ACTLR register. Note that setting specific bits in the ACTLR
  917. register may not be available in non-secure mode.
  918. config ARM_ERRATA_460075
  919. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  920. depends on CPU_V7
  921. depends on !ARCH_MULTIPLATFORM
  922. help
  923. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  924. erratum. Any asynchronous access to the L2 cache may encounter a
  925. situation in which recent store transactions to the L2 cache are lost
  926. and overwritten with stale memory contents from external memory. The
  927. workaround disables the write-allocate mode for the L2 cache via the
  928. ACTLR register. Note that setting specific bits in the ACTLR register
  929. may not be available in non-secure mode.
  930. config ARM_ERRATA_742230
  931. bool "ARM errata: DMB operation may be faulty"
  932. depends on CPU_V7 && SMP
  933. depends on !ARCH_MULTIPLATFORM
  934. help
  935. This option enables the workaround for the 742230 Cortex-A9
  936. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  937. between two write operations may not ensure the correct visibility
  938. ordering of the two writes. This workaround sets a specific bit in
  939. the diagnostic register of the Cortex-A9 which causes the DMB
  940. instruction to behave as a DSB, ensuring the correct behaviour of
  941. the two writes.
  942. config ARM_ERRATA_742231
  943. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  944. depends on CPU_V7 && SMP
  945. depends on !ARCH_MULTIPLATFORM
  946. help
  947. This option enables the workaround for the 742231 Cortex-A9
  948. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  949. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  950. accessing some data located in the same cache line, may get corrupted
  951. data due to bad handling of the address hazard when the line gets
  952. replaced from one of the CPUs at the same time as another CPU is
  953. accessing it. This workaround sets specific bits in the diagnostic
  954. register of the Cortex-A9 which reduces the linefill issuing
  955. capabilities of the processor.
  956. config ARM_ERRATA_643719
  957. bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
  958. depends on CPU_V7 && SMP
  959. help
  960. This option enables the workaround for the 643719 Cortex-A9 (prior to
  961. r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
  962. register returns zero when it should return one. The workaround
  963. corrects this value, ensuring cache maintenance operations which use
  964. it behave as intended and avoiding data corruption.
  965. config ARM_ERRATA_720789
  966. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  967. depends on CPU_V7
  968. help
  969. This option enables the workaround for the 720789 Cortex-A9 (prior to
  970. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  971. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  972. As a consequence of this erratum, some TLB entries which should be
  973. invalidated are not, resulting in an incoherency in the system page
  974. tables. The workaround changes the TLB flushing routines to invalidate
  975. entries regardless of the ASID.
  976. config ARM_ERRATA_743622
  977. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  978. depends on CPU_V7
  979. depends on !ARCH_MULTIPLATFORM
  980. help
  981. This option enables the workaround for the 743622 Cortex-A9
  982. (r2p*) erratum. Under very rare conditions, a faulty
  983. optimisation in the Cortex-A9 Store Buffer may lead to data
  984. corruption. This workaround sets a specific bit in the diagnostic
  985. register of the Cortex-A9 which disables the Store Buffer
  986. optimisation, preventing the defect from occurring. This has no
  987. visible impact on the overall performance or power consumption of the
  988. processor.
  989. config ARM_ERRATA_751472
  990. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  991. depends on CPU_V7
  992. depends on !ARCH_MULTIPLATFORM
  993. help
  994. This option enables the workaround for the 751472 Cortex-A9 (prior
  995. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  996. completion of a following broadcasted operation if the second
  997. operation is received by a CPU before the ICIALLUIS has completed,
  998. potentially leading to corrupted entries in the cache or TLB.
  999. config ARM_ERRATA_754322
  1000. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1001. depends on CPU_V7
  1002. help
  1003. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1004. r3p*) erratum. A speculative memory access may cause a page table walk
  1005. which starts prior to an ASID switch but completes afterwards. This
  1006. can populate the micro-TLB with a stale entry which may be hit with
  1007. the new ASID. This workaround places two dsb instructions in the mm
  1008. switching code so that no page table walks can cross the ASID switch.
  1009. config ARM_ERRATA_754327
  1010. bool "ARM errata: no automatic Store Buffer drain"
  1011. depends on CPU_V7 && SMP
  1012. help
  1013. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1014. r2p0) erratum. The Store Buffer does not have any automatic draining
  1015. mechanism and therefore a livelock may occur if an external agent
  1016. continuously polls a memory location waiting to observe an update.
  1017. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1018. written polling loops from denying visibility of updates to memory.
  1019. config ARM_ERRATA_364296
  1020. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1021. depends on CPU_V6
  1022. help
  1023. This options enables the workaround for the 364296 ARM1136
  1024. r0p2 erratum (possible cache data corruption with
  1025. hit-under-miss enabled). It sets the undocumented bit 31 in
  1026. the auxiliary control register and the FI bit in the control
  1027. register, thus disabling hit-under-miss without putting the
  1028. processor into full low interrupt latency mode. ARM11MPCore
  1029. is not affected.
  1030. config ARM_ERRATA_764369
  1031. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1032. depends on CPU_V7 && SMP
  1033. help
  1034. This option enables the workaround for erratum 764369
  1035. affecting Cortex-A9 MPCore with two or more processors (all
  1036. current revisions). Under certain timing circumstances, a data
  1037. cache line maintenance operation by MVA targeting an Inner
  1038. Shareable memory region may fail to proceed up to either the
  1039. Point of Coherency or to the Point of Unification of the
  1040. system. This workaround adds a DSB instruction before the
  1041. relevant cache maintenance functions and sets a specific bit
  1042. in the diagnostic control register of the SCU.
  1043. config ARM_ERRATA_775420
  1044. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1045. depends on CPU_V7
  1046. help
  1047. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1048. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1049. operation aborts with MMU exception, it might cause the processor
  1050. to deadlock. This workaround puts DSB before executing ISB if
  1051. an abort may occur on cache maintenance.
  1052. config ARM_ERRATA_798181
  1053. bool "ARM errata: TLBI/DSB failure on Cortex-A15"
  1054. depends on CPU_V7 && SMP
  1055. help
  1056. On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
  1057. adequately shooting down all use of the old entries. This
  1058. option enables the Linux kernel workaround for this erratum
  1059. which sends an IPI to the CPUs that are running the same ASID
  1060. as the one being invalidated.
  1061. config ARM_ERRATA_773022
  1062. bool "ARM errata: incorrect instructions may be executed from loop buffer"
  1063. depends on CPU_V7
  1064. help
  1065. This option enables the workaround for the 773022 Cortex-A15
  1066. (up to r0p4) erratum. In certain rare sequences of code, the
  1067. loop buffer may deliver incorrect instructions. This
  1068. workaround disables the loop buffer to avoid the erratum.
  1069. endmenu
  1070. source "arch/arm/common/Kconfig"
  1071. menu "Bus support"
  1072. config ARM_AMBA
  1073. bool
  1074. config ISA
  1075. bool
  1076. help
  1077. Find out whether you have ISA slots on your motherboard. ISA is the
  1078. name of a bus system, i.e. the way the CPU talks to the other stuff
  1079. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1080. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1081. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1082. # Select ISA DMA controller support
  1083. config ISA_DMA
  1084. bool
  1085. select ISA_DMA_API
  1086. # Select ISA DMA interface
  1087. config ISA_DMA_API
  1088. bool
  1089. config PCI
  1090. bool "PCI support" if MIGHT_HAVE_PCI
  1091. help
  1092. Find out whether you have a PCI motherboard. PCI is the name of a
  1093. bus system, i.e. the way the CPU talks to the other stuff inside
  1094. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1095. VESA. If you have PCI, say Y, otherwise N.
  1096. config PCI_DOMAINS
  1097. bool
  1098. depends on PCI
  1099. config PCI_NANOENGINE
  1100. bool "BSE nanoEngine PCI support"
  1101. depends on SA1100_NANOENGINE
  1102. help
  1103. Enable PCI on the BSE nanoEngine board.
  1104. config PCI_SYSCALL
  1105. def_bool PCI
  1106. config PCI_HOST_ITE8152
  1107. bool
  1108. depends on PCI && MACH_ARMCORE
  1109. default y
  1110. select DMABOUNCE
  1111. source "drivers/pci/Kconfig"
  1112. source "drivers/pci/pcie/Kconfig"
  1113. source "drivers/pcmcia/Kconfig"
  1114. endmenu
  1115. menu "Kernel Features"
  1116. config HAVE_SMP
  1117. bool
  1118. help
  1119. This option should be selected by machines which have an SMP-
  1120. capable CPU.
  1121. The only effect of this option is to make the SMP-related
  1122. options available to the user for configuration.
  1123. config SMP
  1124. bool "Symmetric Multi-Processing"
  1125. depends on CPU_V6K || CPU_V7
  1126. depends on GENERIC_CLOCKEVENTS
  1127. depends on HAVE_SMP
  1128. depends on MMU || ARM_MPU
  1129. help
  1130. This enables support for systems with more than one CPU. If you have
  1131. a system with only one CPU, say N. If you have a system with more
  1132. than one CPU, say Y.
  1133. If you say N here, the kernel will run on uni- and multiprocessor
  1134. machines, but will use only one CPU of a multiprocessor machine. If
  1135. you say Y here, the kernel will run on many, but not all,
  1136. uniprocessor machines. On a uniprocessor machine, the kernel
  1137. will run faster if you say N here.
  1138. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1139. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1140. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1141. If you don't know what to do here, say N.
  1142. config SMP_ON_UP
  1143. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1144. depends on SMP && !XIP_KERNEL && MMU
  1145. default y
  1146. help
  1147. SMP kernels contain instructions which fail on non-SMP processors.
  1148. Enabling this option allows the kernel to modify itself to make
  1149. these instructions safe. Disabling it allows about 1K of space
  1150. savings.
  1151. If you don't know what to do here, say Y.
  1152. config ARM_CPU_TOPOLOGY
  1153. bool "Support cpu topology definition"
  1154. depends on SMP && CPU_V7
  1155. default y
  1156. help
  1157. Support ARM cpu topology definition. The MPIDR register defines
  1158. affinity between processors which is then used to describe the cpu
  1159. topology of an ARM System.
  1160. config SCHED_MC
  1161. bool "Multi-core scheduler support"
  1162. depends on ARM_CPU_TOPOLOGY
  1163. help
  1164. Multi-core scheduler support improves the CPU scheduler's decision
  1165. making when dealing with multi-core CPU chips at a cost of slightly
  1166. increased overhead in some places. If unsure say N here.
  1167. config SCHED_SMT
  1168. bool "SMT scheduler support"
  1169. depends on ARM_CPU_TOPOLOGY
  1170. help
  1171. Improves the CPU scheduler's decision making when dealing with
  1172. MultiThreading at a cost of slightly increased overhead in some
  1173. places. If unsure say N here.
  1174. config HAVE_ARM_SCU
  1175. bool
  1176. help
  1177. This option enables support for the ARM system coherency unit
  1178. config HAVE_ARM_ARCH_TIMER
  1179. bool "Architected timer support"
  1180. depends on CPU_V7
  1181. select ARM_ARCH_TIMER
  1182. select GENERIC_CLOCKEVENTS
  1183. help
  1184. This option enables support for the ARM architected timer
  1185. config HAVE_ARM_TWD
  1186. bool
  1187. depends on SMP
  1188. select CLKSRC_OF if OF
  1189. help
  1190. This options enables support for the ARM timer and watchdog unit
  1191. config MCPM
  1192. bool "Multi-Cluster Power Management"
  1193. depends on CPU_V7 && SMP
  1194. help
  1195. This option provides the common power management infrastructure
  1196. for (multi-)cluster based systems, such as big.LITTLE based
  1197. systems.
  1198. config MCPM_QUAD_CLUSTER
  1199. bool
  1200. depends on MCPM
  1201. help
  1202. To avoid wasting resources unnecessarily, MCPM only supports up
  1203. to 2 clusters by default.
  1204. Platforms with 3 or 4 clusters that use MCPM must select this
  1205. option to allow the additional clusters to be managed.
  1206. config BIG_LITTLE
  1207. bool "big.LITTLE support (Experimental)"
  1208. depends on CPU_V7 && SMP
  1209. select MCPM
  1210. help
  1211. This option enables support selections for the big.LITTLE
  1212. system architecture.
  1213. config BL_SWITCHER
  1214. bool "big.LITTLE switcher support"
  1215. depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
  1216. select ARM_CPU_SUSPEND
  1217. select CPU_PM
  1218. help
  1219. The big.LITTLE "switcher" provides the core functionality to
  1220. transparently handle transition between a cluster of A15's
  1221. and a cluster of A7's in a big.LITTLE system.
  1222. config BL_SWITCHER_DUMMY_IF
  1223. tristate "Simple big.LITTLE switcher user interface"
  1224. depends on BL_SWITCHER && DEBUG_KERNEL
  1225. help
  1226. This is a simple and dummy char dev interface to control
  1227. the big.LITTLE switcher core code. It is meant for
  1228. debugging purposes only.
  1229. choice
  1230. prompt "Memory split"
  1231. depends on MMU
  1232. default VMSPLIT_3G
  1233. help
  1234. Select the desired split between kernel and user memory.
  1235. If you are not absolutely sure what you are doing, leave this
  1236. option alone!
  1237. config VMSPLIT_3G
  1238. bool "3G/1G user/kernel split"
  1239. config VMSPLIT_2G
  1240. bool "2G/2G user/kernel split"
  1241. config VMSPLIT_1G
  1242. bool "1G/3G user/kernel split"
  1243. endchoice
  1244. config PAGE_OFFSET
  1245. hex
  1246. default PHYS_OFFSET if !MMU
  1247. default 0x40000000 if VMSPLIT_1G
  1248. default 0x80000000 if VMSPLIT_2G
  1249. default 0xC0000000
  1250. config NR_CPUS
  1251. int "Maximum number of CPUs (2-32)"
  1252. range 2 32
  1253. depends on SMP
  1254. default "4"
  1255. config HOTPLUG_CPU
  1256. bool "Support for hot-pluggable CPUs"
  1257. depends on SMP
  1258. help
  1259. Say Y here to experiment with turning CPUs off and on. CPUs
  1260. can be controlled through /sys/devices/system/cpu.
  1261. config ARM_PSCI
  1262. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1263. depends on CPU_V7
  1264. help
  1265. Say Y here if you want Linux to communicate with system firmware
  1266. implementing the PSCI specification for CPU-centric power
  1267. management operations described in ARM document number ARM DEN
  1268. 0022A ("Power State Coordination Interface System Software on
  1269. ARM processors").
  1270. # The GPIO number here must be sorted by descending number. In case of
  1271. # a multiplatform kernel, we just want the highest value required by the
  1272. # selected platforms.
  1273. config ARCH_NR_GPIO
  1274. int
  1275. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1276. default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
  1277. SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
  1278. default 416 if ARCH_SUNXI
  1279. default 392 if ARCH_U8500
  1280. default 352 if ARCH_VT8500
  1281. default 288 if ARCH_ROCKCHIP
  1282. default 264 if MACH_H4700
  1283. default 0
  1284. help
  1285. Maximum number of GPIOs in the system.
  1286. If unsure, leave the default value.
  1287. source kernel/Kconfig.preempt
  1288. config HZ_FIXED
  1289. int
  1290. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
  1291. ARCH_S5PV210 || ARCH_EXYNOS4
  1292. default AT91_TIMER_HZ if ARCH_AT91
  1293. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
  1294. default 0
  1295. choice
  1296. depends on HZ_FIXED = 0
  1297. prompt "Timer frequency"
  1298. config HZ_100
  1299. bool "100 Hz"
  1300. config HZ_200
  1301. bool "200 Hz"
  1302. config HZ_250
  1303. bool "250 Hz"
  1304. config HZ_300
  1305. bool "300 Hz"
  1306. config HZ_500
  1307. bool "500 Hz"
  1308. config HZ_1000
  1309. bool "1000 Hz"
  1310. endchoice
  1311. config HZ
  1312. int
  1313. default HZ_FIXED if HZ_FIXED != 0
  1314. default 100 if HZ_100
  1315. default 200 if HZ_200
  1316. default 250 if HZ_250
  1317. default 300 if HZ_300
  1318. default 500 if HZ_500
  1319. default 1000
  1320. config SCHED_HRTICK
  1321. def_bool HIGH_RES_TIMERS
  1322. config THUMB2_KERNEL
  1323. bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
  1324. depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
  1325. default y if CPU_THUMBONLY
  1326. select AEABI
  1327. select ARM_ASM_UNIFIED
  1328. select ARM_UNWIND
  1329. help
  1330. By enabling this option, the kernel will be compiled in
  1331. Thumb-2 mode. A compiler/assembler that understand the unified
  1332. ARM-Thumb syntax is needed.
  1333. If unsure, say N.
  1334. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1335. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1336. depends on THUMB2_KERNEL && MODULES
  1337. default y
  1338. help
  1339. Various binutils versions can resolve Thumb-2 branches to
  1340. locally-defined, preemptible global symbols as short-range "b.n"
  1341. branch instructions.
  1342. This is a problem, because there's no guarantee the final
  1343. destination of the symbol, or any candidate locations for a
  1344. trampoline, are within range of the branch. For this reason, the
  1345. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1346. relocation in modules at all, and it makes little sense to add
  1347. support.
  1348. The symptom is that the kernel fails with an "unsupported
  1349. relocation" error when loading some modules.
  1350. Until fixed tools are available, passing
  1351. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1352. code which hits this problem, at the cost of a bit of extra runtime
  1353. stack usage in some cases.
  1354. The problem is described in more detail at:
  1355. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1356. Only Thumb-2 kernels are affected.
  1357. Unless you are sure your tools don't have this problem, say Y.
  1358. config ARM_ASM_UNIFIED
  1359. bool
  1360. config AEABI
  1361. bool "Use the ARM EABI to compile the kernel"
  1362. help
  1363. This option allows for the kernel to be compiled using the latest
  1364. ARM ABI (aka EABI). This is only useful if you are using a user
  1365. space environment that is also compiled with EABI.
  1366. Since there are major incompatibilities between the legacy ABI and
  1367. EABI, especially with regard to structure member alignment, this
  1368. option also changes the kernel syscall calling convention to
  1369. disambiguate both ABIs and allow for backward compatibility support
  1370. (selected with CONFIG_OABI_COMPAT).
  1371. To use this you need GCC version 4.0.0 or later.
  1372. config OABI_COMPAT
  1373. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1374. depends on AEABI && !THUMB2_KERNEL
  1375. help
  1376. This option preserves the old syscall interface along with the
  1377. new (ARM EABI) one. It also provides a compatibility layer to
  1378. intercept syscalls that have structure arguments which layout
  1379. in memory differs between the legacy ABI and the new ARM EABI
  1380. (only for non "thumb" binaries). This option adds a tiny
  1381. overhead to all syscalls and produces a slightly larger kernel.
  1382. The seccomp filter system will not be available when this is
  1383. selected, since there is no way yet to sensibly distinguish
  1384. between calling conventions during filtering.
  1385. If you know you'll be using only pure EABI user space then you
  1386. can say N here. If this option is not selected and you attempt
  1387. to execute a legacy ABI binary then the result will be
  1388. UNPREDICTABLE (in fact it can be predicted that it won't work
  1389. at all). If in doubt say N.
  1390. config ARCH_HAS_HOLES_MEMORYMODEL
  1391. bool
  1392. config ARCH_SPARSEMEM_ENABLE
  1393. bool
  1394. config ARCH_SPARSEMEM_DEFAULT
  1395. def_bool ARCH_SPARSEMEM_ENABLE
  1396. config ARCH_SELECT_MEMORY_MODEL
  1397. def_bool ARCH_SPARSEMEM_ENABLE
  1398. config HAVE_ARCH_PFN_VALID
  1399. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1400. config HAVE_GENERIC_RCU_GUP
  1401. def_bool y
  1402. depends on ARM_LPAE
  1403. config HIGHMEM
  1404. bool "High Memory Support"
  1405. depends on MMU
  1406. help
  1407. The address space of ARM processors is only 4 Gigabytes large
  1408. and it has to accommodate user address space, kernel address
  1409. space as well as some memory mapped IO. That means that, if you
  1410. have a large amount of physical memory and/or IO, not all of the
  1411. memory can be "permanently mapped" by the kernel. The physical
  1412. memory that is not permanently mapped is called "high memory".
  1413. Depending on the selected kernel/user memory split, minimum
  1414. vmalloc space and actual amount of RAM, you may not need this
  1415. option which should result in a slightly faster kernel.
  1416. If unsure, say n.
  1417. config HIGHPTE
  1418. bool "Allocate 2nd-level pagetables from highmem"
  1419. depends on HIGHMEM
  1420. config HW_PERF_EVENTS
  1421. bool "Enable hardware performance counter support for perf events"
  1422. depends on PERF_EVENTS
  1423. default y
  1424. help
  1425. Enable hardware performance counter support for perf events. If
  1426. disabled, perf events will use software events only.
  1427. config SYS_SUPPORTS_HUGETLBFS
  1428. def_bool y
  1429. depends on ARM_LPAE
  1430. config HAVE_ARCH_TRANSPARENT_HUGEPAGE
  1431. def_bool y
  1432. depends on ARM_LPAE
  1433. config ARCH_WANT_GENERAL_HUGETLB
  1434. def_bool y
  1435. source "mm/Kconfig"
  1436. config FORCE_MAX_ZONEORDER
  1437. int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
  1438. range 11 64 if ARCH_SHMOBILE_LEGACY
  1439. default "12" if SOC_AM33XX
  1440. default "9" if SA1111 || ARCH_EFM32
  1441. default "11"
  1442. help
  1443. The kernel memory allocator divides physically contiguous memory
  1444. blocks into "zones", where each zone is a power of two number of
  1445. pages. This option selects the largest power of two that the kernel
  1446. keeps in the memory allocator. If you need to allocate very large
  1447. blocks of physically contiguous memory, then you may need to
  1448. increase this value.
  1449. This config option is actually maximum order plus one. For example,
  1450. a value of 11 means that the largest free memory block is 2^10 pages.
  1451. config ALIGNMENT_TRAP
  1452. bool
  1453. depends on CPU_CP15_MMU
  1454. default y if !ARCH_EBSA110
  1455. select HAVE_PROC_CPU if PROC_FS
  1456. help
  1457. ARM processors cannot fetch/store information which is not
  1458. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1459. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1460. fetch/store instructions will be emulated in software if you say
  1461. here, which has a severe performance impact. This is necessary for
  1462. correct operation of some network protocols. With an IP-only
  1463. configuration it is safe to say N, otherwise say Y.
  1464. config UACCESS_WITH_MEMCPY
  1465. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1466. depends on MMU
  1467. default y if CPU_FEROCEON
  1468. help
  1469. Implement faster copy_to_user and clear_user methods for CPU
  1470. cores where a 8-word STM instruction give significantly higher
  1471. memory write throughput than a sequence of individual 32bit stores.
  1472. A possible side effect is a slight increase in scheduling latency
  1473. between threads sharing the same address space if they invoke
  1474. such copy operations with large buffers.
  1475. However, if the CPU data cache is using a write-allocate mode,
  1476. this option is unlikely to provide any performance gain.
  1477. config SECCOMP
  1478. bool
  1479. prompt "Enable seccomp to safely compute untrusted bytecode"
  1480. ---help---
  1481. This kernel feature is useful for number crunching applications
  1482. that may need to compute untrusted bytecode during their
  1483. execution. By using pipes or other transports made available to
  1484. the process as file descriptors supporting the read/write
  1485. syscalls, it's possible to isolate those applications in
  1486. their own address space using seccomp. Once seccomp is
  1487. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1488. and the task is only allowed to execute a few safe syscalls
  1489. defined by each seccomp mode.
  1490. config SWIOTLB
  1491. def_bool y
  1492. config IOMMU_HELPER
  1493. def_bool SWIOTLB
  1494. config XEN_DOM0
  1495. def_bool y
  1496. depends on XEN
  1497. config XEN
  1498. bool "Xen guest support on ARM"
  1499. depends on ARM && AEABI && OF
  1500. depends on CPU_V7 && !CPU_V6
  1501. depends on !GENERIC_ATOMIC64
  1502. depends on MMU
  1503. select ARCH_DMA_ADDR_T_64BIT
  1504. select ARM_PSCI
  1505. select SWIOTLB_XEN
  1506. help
  1507. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1508. endmenu
  1509. menu "Boot options"
  1510. config USE_OF
  1511. bool "Flattened Device Tree support"
  1512. select IRQ_DOMAIN
  1513. select OF
  1514. select OF_EARLY_FLATTREE
  1515. select OF_RESERVED_MEM
  1516. help
  1517. Include support for flattened device tree machine descriptions.
  1518. config ATAGS
  1519. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1520. default y
  1521. help
  1522. This is the traditional way of passing data to the kernel at boot
  1523. time. If you are solely relying on the flattened device tree (or
  1524. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1525. to remove ATAGS support from your kernel binary. If unsure,
  1526. leave this to y.
  1527. config DEPRECATED_PARAM_STRUCT
  1528. bool "Provide old way to pass kernel parameters"
  1529. depends on ATAGS
  1530. help
  1531. This was deprecated in 2001 and announced to live on for 5 years.
  1532. Some old boot loaders still use this way.
  1533. # Compressed boot loader in ROM. Yes, we really want to ask about
  1534. # TEXT and BSS so we preserve their values in the config files.
  1535. config ZBOOT_ROM_TEXT
  1536. hex "Compressed ROM boot loader base address"
  1537. default "0"
  1538. help
  1539. The physical address at which the ROM-able zImage is to be
  1540. placed in the target. Platforms which normally make use of
  1541. ROM-able zImage formats normally set this to a suitable
  1542. value in their defconfig file.
  1543. If ZBOOT_ROM is not enabled, this has no effect.
  1544. config ZBOOT_ROM_BSS
  1545. hex "Compressed ROM boot loader BSS address"
  1546. default "0"
  1547. help
  1548. The base address of an area of read/write memory in the target
  1549. for the ROM-able zImage which must be available while the
  1550. decompressor is running. It must be large enough to hold the
  1551. entire decompressed kernel plus an additional 128 KiB.
  1552. Platforms which normally make use of ROM-able zImage formats
  1553. normally set this to a suitable value in their defconfig file.
  1554. If ZBOOT_ROM is not enabled, this has no effect.
  1555. config ZBOOT_ROM
  1556. bool "Compressed boot loader in ROM/flash"
  1557. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1558. depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
  1559. help
  1560. Say Y here if you intend to execute your compressed kernel image
  1561. (zImage) directly from ROM or flash. If unsure, say N.
  1562. choice
  1563. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1564. depends on ZBOOT_ROM && ARCH_SH7372
  1565. default ZBOOT_ROM_NONE
  1566. help
  1567. Include experimental SD/MMC loading code in the ROM-able zImage.
  1568. With this enabled it is possible to write the ROM-able zImage
  1569. kernel image to an MMC or SD card and boot the kernel straight
  1570. from the reset vector. At reset the processor Mask ROM will load
  1571. the first part of the ROM-able zImage which in turn loads the
  1572. rest the kernel image to RAM.
  1573. config ZBOOT_ROM_NONE
  1574. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1575. help
  1576. Do not load image from SD or MMC
  1577. config ZBOOT_ROM_MMCIF
  1578. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1579. help
  1580. Load image from MMCIF hardware block.
  1581. config ZBOOT_ROM_SH_MOBILE_SDHI
  1582. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1583. help
  1584. Load image from SDHI hardware block
  1585. endchoice
  1586. config ARM_APPENDED_DTB
  1587. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1588. depends on OF
  1589. help
  1590. With this option, the boot code will look for a device tree binary
  1591. (DTB) appended to zImage
  1592. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1593. This is meant as a backward compatibility convenience for those
  1594. systems with a bootloader that can't be upgraded to accommodate
  1595. the documented boot protocol using a device tree.
  1596. Beware that there is very little in terms of protection against
  1597. this option being confused by leftover garbage in memory that might
  1598. look like a DTB header after a reboot if no actual DTB is appended
  1599. to zImage. Do not leave this option active in a production kernel
  1600. if you don't intend to always append a DTB. Proper passing of the
  1601. location into r2 of a bootloader provided DTB is always preferable
  1602. to this option.
  1603. config ARM_ATAG_DTB_COMPAT
  1604. bool "Supplement the appended DTB with traditional ATAG information"
  1605. depends on ARM_APPENDED_DTB
  1606. help
  1607. Some old bootloaders can't be updated to a DTB capable one, yet
  1608. they provide ATAGs with memory configuration, the ramdisk address,
  1609. the kernel cmdline string, etc. Such information is dynamically
  1610. provided by the bootloader and can't always be stored in a static
  1611. DTB. To allow a device tree enabled kernel to be used with such
  1612. bootloaders, this option allows zImage to extract the information
  1613. from the ATAG list and store it at run time into the appended DTB.
  1614. choice
  1615. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1616. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1617. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1618. bool "Use bootloader kernel arguments if available"
  1619. help
  1620. Uses the command-line options passed by the boot loader instead of
  1621. the device tree bootargs property. If the boot loader doesn't provide
  1622. any, the device tree bootargs property will be used.
  1623. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1624. bool "Extend with bootloader kernel arguments"
  1625. help
  1626. The command-line arguments provided by the boot loader will be
  1627. appended to the the device tree bootargs property.
  1628. endchoice
  1629. config CMDLINE
  1630. string "Default kernel command string"
  1631. default ""
  1632. help
  1633. On some architectures (EBSA110 and CATS), there is currently no way
  1634. for the boot loader to pass arguments to the kernel. For these
  1635. architectures, you should supply some command-line options at build
  1636. time by entering them here. As a minimum, you should specify the
  1637. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1638. choice
  1639. prompt "Kernel command line type" if CMDLINE != ""
  1640. default CMDLINE_FROM_BOOTLOADER
  1641. depends on ATAGS
  1642. config CMDLINE_FROM_BOOTLOADER
  1643. bool "Use bootloader kernel arguments if available"
  1644. help
  1645. Uses the command-line options passed by the boot loader. If
  1646. the boot loader doesn't provide any, the default kernel command
  1647. string provided in CMDLINE will be used.
  1648. config CMDLINE_EXTEND
  1649. bool "Extend bootloader kernel arguments"
  1650. help
  1651. The command-line arguments provided by the boot loader will be
  1652. appended to the default kernel command string.
  1653. config CMDLINE_FORCE
  1654. bool "Always use the default kernel command string"
  1655. help
  1656. Always use the default kernel command string, even if the boot
  1657. loader passes other arguments to the kernel.
  1658. This is useful if you cannot or don't want to change the
  1659. command-line options your boot loader passes to the kernel.
  1660. endchoice
  1661. config XIP_KERNEL
  1662. bool "Kernel Execute-In-Place from ROM"
  1663. depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
  1664. help
  1665. Execute-In-Place allows the kernel to run from non-volatile storage
  1666. directly addressable by the CPU, such as NOR flash. This saves RAM
  1667. space since the text section of the kernel is not loaded from flash
  1668. to RAM. Read-write sections, such as the data section and stack,
  1669. are still copied to RAM. The XIP kernel is not compressed since
  1670. it has to run directly from flash, so it will take more space to
  1671. store it. The flash address used to link the kernel object files,
  1672. and for storing it, is configuration dependent. Therefore, if you
  1673. say Y here, you must know the proper physical address where to
  1674. store the kernel image depending on your own flash memory usage.
  1675. Also note that the make target becomes "make xipImage" rather than
  1676. "make zImage" or "make Image". The final kernel binary to put in
  1677. ROM memory will be arch/arm/boot/xipImage.
  1678. If unsure, say N.
  1679. config XIP_PHYS_ADDR
  1680. hex "XIP Kernel Physical Location"
  1681. depends on XIP_KERNEL
  1682. default "0x00080000"
  1683. help
  1684. This is the physical address in your flash memory the kernel will
  1685. be linked for and stored to. This address is dependent on your
  1686. own flash usage.
  1687. config KEXEC
  1688. bool "Kexec system call (EXPERIMENTAL)"
  1689. depends on (!SMP || PM_SLEEP_SMP)
  1690. help
  1691. kexec is a system call that implements the ability to shutdown your
  1692. current kernel, and to start another kernel. It is like a reboot
  1693. but it is independent of the system firmware. And like a reboot
  1694. you can start any kernel with it, not just Linux.
  1695. It is an ongoing process to be certain the hardware in a machine
  1696. is properly shutdown, so do not be surprised if this code does not
  1697. initially work for you.
  1698. config ATAGS_PROC
  1699. bool "Export atags in procfs"
  1700. depends on ATAGS && KEXEC
  1701. default y
  1702. help
  1703. Should the atags used to boot the kernel be exported in an "atags"
  1704. file in procfs. Useful with kexec.
  1705. config CRASH_DUMP
  1706. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1707. help
  1708. Generate crash dump after being started by kexec. This should
  1709. be normally only set in special crash dump kernels which are
  1710. loaded in the main kernel with kexec-tools into a specially
  1711. reserved region and then later executed after a crash by
  1712. kdump/kexec. The crash dump kernel must be compiled to a
  1713. memory address not used by the main kernel
  1714. For more details see Documentation/kdump/kdump.txt
  1715. config AUTO_ZRELADDR
  1716. bool "Auto calculation of the decompressed kernel image address"
  1717. help
  1718. ZRELADDR is the physical address where the decompressed kernel
  1719. image will be placed. If AUTO_ZRELADDR is selected, the address
  1720. will be determined at run-time by masking the current IP with
  1721. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1722. from start of memory.
  1723. endmenu
  1724. menu "CPU Power Management"
  1725. source "drivers/cpufreq/Kconfig"
  1726. source "drivers/cpuidle/Kconfig"
  1727. endmenu
  1728. menu "Floating point emulation"
  1729. comment "At least one emulation must be selected"
  1730. config FPE_NWFPE
  1731. bool "NWFPE math emulation"
  1732. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1733. ---help---
  1734. Say Y to include the NWFPE floating point emulator in the kernel.
  1735. This is necessary to run most binaries. Linux does not currently
  1736. support floating point hardware so you need to say Y here even if
  1737. your machine has an FPA or floating point co-processor podule.
  1738. You may say N here if you are going to load the Acorn FPEmulator
  1739. early in the bootup.
  1740. config FPE_NWFPE_XP
  1741. bool "Support extended precision"
  1742. depends on FPE_NWFPE
  1743. help
  1744. Say Y to include 80-bit support in the kernel floating-point
  1745. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1746. Note that gcc does not generate 80-bit operations by default,
  1747. so in most cases this option only enlarges the size of the
  1748. floating point emulator without any good reason.
  1749. You almost surely want to say N here.
  1750. config FPE_FASTFPE
  1751. bool "FastFPE math emulation (EXPERIMENTAL)"
  1752. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1753. ---help---
  1754. Say Y here to include the FAST floating point emulator in the kernel.
  1755. This is an experimental much faster emulator which now also has full
  1756. precision for the mantissa. It does not support any exceptions.
  1757. It is very simple, and approximately 3-6 times faster than NWFPE.
  1758. It should be sufficient for most programs. It may be not suitable
  1759. for scientific calculations, but you have to check this for yourself.
  1760. If you do not feel you need a faster FP emulation you should better
  1761. choose NWFPE.
  1762. config VFP
  1763. bool "VFP-format floating point maths"
  1764. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1765. help
  1766. Say Y to include VFP support code in the kernel. This is needed
  1767. if your hardware includes a VFP unit.
  1768. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1769. release notes and additional status information.
  1770. Say N if your target does not have VFP hardware.
  1771. config VFPv3
  1772. bool
  1773. depends on VFP
  1774. default y if CPU_V7
  1775. config NEON
  1776. bool "Advanced SIMD (NEON) Extension support"
  1777. depends on VFPv3 && CPU_V7
  1778. help
  1779. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1780. Extension.
  1781. config KERNEL_MODE_NEON
  1782. bool "Support for NEON in kernel mode"
  1783. depends on NEON && AEABI
  1784. help
  1785. Say Y to include support for NEON in kernel mode.
  1786. endmenu
  1787. menu "Userspace binary formats"
  1788. source "fs/Kconfig.binfmt"
  1789. config ARTHUR
  1790. tristate "RISC OS personality"
  1791. depends on !AEABI
  1792. help
  1793. Say Y here to include the kernel code necessary if you want to run
  1794. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1795. experimental; if this sounds frightening, say N and sleep in peace.
  1796. You can also say M here to compile this support as a module (which
  1797. will be called arthur).
  1798. endmenu
  1799. menu "Power management options"
  1800. source "kernel/power/Kconfig"
  1801. config ARCH_SUSPEND_POSSIBLE
  1802. depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
  1803. CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1804. def_bool y
  1805. config ARM_CPU_SUSPEND
  1806. def_bool PM_SLEEP
  1807. config ARCH_HIBERNATION_POSSIBLE
  1808. bool
  1809. depends on MMU
  1810. default y if ARCH_SUSPEND_POSSIBLE
  1811. endmenu
  1812. source "net/Kconfig"
  1813. source "drivers/Kconfig"
  1814. source "fs/Kconfig"
  1815. source "arch/arm/Kconfig.debug"
  1816. source "security/Kconfig"
  1817. source "crypto/Kconfig"
  1818. source "lib/Kconfig"
  1819. source "arch/arm/kvm/Kconfig"