Kconfig 64 KB

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  1. config ARM
  2. bool
  3. default y
  4. select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  5. select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  6. select ARCH_HAVE_CUSTOM_GPIO_H
  7. select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  8. select ARCH_WANT_IPC_PARSE_VERSION
  9. select BUILDTIME_EXTABLE_SORT if MMU
  10. select CPU_PM if (SUSPEND || CPU_IDLE)
  11. select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
  12. select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
  13. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  14. select GENERIC_IRQ_PROBE
  15. select GENERIC_IRQ_SHOW
  16. select GENERIC_PCI_IOMAP
  17. select GENERIC_SCHED_CLOCK
  18. select GENERIC_SMP_IDLE_THREAD
  19. select GENERIC_IDLE_POLL_SETUP
  20. select GENERIC_STRNCPY_FROM_USER
  21. select GENERIC_STRNLEN_USER
  22. select HARDIRQS_SW_RESEND
  23. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  24. select HAVE_ARCH_KGDB
  25. select HAVE_ARCH_SECCOMP_FILTER
  26. select HAVE_ARCH_TRACEHOOK
  27. select HAVE_BPF_JIT
  28. select HAVE_C_RECORDMCOUNT
  29. select HAVE_DEBUG_KMEMLEAK
  30. select HAVE_DMA_API_DEBUG
  31. select HAVE_DMA_ATTRS
  32. select HAVE_DMA_CONTIGUOUS if MMU
  33. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  34. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  35. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  36. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  37. select HAVE_GENERIC_DMA_COHERENT
  38. select HAVE_GENERIC_HARDIRQS
  39. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  40. select HAVE_IDE if PCI || ISA || PCMCIA
  41. select HAVE_IRQ_TIME_ACCOUNTING
  42. select HAVE_KERNEL_GZIP
  43. select HAVE_KERNEL_LZ4
  44. select HAVE_KERNEL_LZMA
  45. select HAVE_KERNEL_LZO
  46. select HAVE_KERNEL_XZ
  47. select HAVE_KPROBES if !XIP_KERNEL
  48. select HAVE_KRETPROBES if (HAVE_KPROBES)
  49. select HAVE_MEMBLOCK
  50. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  51. select HAVE_PERF_EVENTS
  52. select HAVE_REGS_AND_STACK_ACCESS_API
  53. select HAVE_SYSCALL_TRACEPOINTS
  54. select HAVE_UID16
  55. select KTIME_SCALAR
  56. select PERF_USE_VMALLOC
  57. select RTC_LIB
  58. select SYS_SUPPORTS_APM_EMULATION
  59. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  60. select MODULES_USE_ELF_REL
  61. select CLONE_BACKWARDS
  62. select OLD_SIGSUSPEND3
  63. select OLD_SIGACTION
  64. select HAVE_CONTEXT_TRACKING
  65. help
  66. The ARM series is a line of low-power-consumption RISC chip designs
  67. licensed by ARM Ltd and targeted at embedded applications and
  68. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  69. manufactured, but legacy ARM-based PC hardware remains popular in
  70. Europe. There is an ARM Linux project with a web page at
  71. <http://www.arm.linux.org.uk/>.
  72. config ARM_HAS_SG_CHAIN
  73. bool
  74. config NEED_SG_DMA_LENGTH
  75. bool
  76. config ARM_DMA_USE_IOMMU
  77. bool
  78. select ARM_HAS_SG_CHAIN
  79. select NEED_SG_DMA_LENGTH
  80. if ARM_DMA_USE_IOMMU
  81. config ARM_DMA_IOMMU_ALIGNMENT
  82. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  83. range 4 9
  84. default 8
  85. help
  86. DMA mapping framework by default aligns all buffers to the smallest
  87. PAGE_SIZE order which is greater than or equal to the requested buffer
  88. size. This works well for buffers up to a few hundreds kilobytes, but
  89. for larger buffers it just a waste of address space. Drivers which has
  90. relatively small addressing window (like 64Mib) might run out of
  91. virtual space with just a few allocations.
  92. With this parameter you can specify the maximum PAGE_SIZE order for
  93. DMA IOMMU buffers. Larger buffers will be aligned only to this
  94. specified order. The order is expressed as a power of two multiplied
  95. by the PAGE_SIZE.
  96. endif
  97. config HAVE_PWM
  98. bool
  99. config MIGHT_HAVE_PCI
  100. bool
  101. config SYS_SUPPORTS_APM_EMULATION
  102. bool
  103. config HAVE_TCM
  104. bool
  105. select GENERIC_ALLOCATOR
  106. config HAVE_PROC_CPU
  107. bool
  108. config NO_IOPORT
  109. bool
  110. config EISA
  111. bool
  112. ---help---
  113. The Extended Industry Standard Architecture (EISA) bus was
  114. developed as an open alternative to the IBM MicroChannel bus.
  115. The EISA bus provided some of the features of the IBM MicroChannel
  116. bus while maintaining backward compatibility with cards made for
  117. the older ISA bus. The EISA bus saw limited use between 1988 and
  118. 1995 when it was made obsolete by the PCI bus.
  119. Say Y here if you are building a kernel for an EISA-based machine.
  120. Otherwise, say N.
  121. config SBUS
  122. bool
  123. config STACKTRACE_SUPPORT
  124. bool
  125. default y
  126. config HAVE_LATENCYTOP_SUPPORT
  127. bool
  128. depends on !SMP
  129. default y
  130. config LOCKDEP_SUPPORT
  131. bool
  132. default y
  133. config TRACE_IRQFLAGS_SUPPORT
  134. bool
  135. default y
  136. config RWSEM_GENERIC_SPINLOCK
  137. bool
  138. default y
  139. config RWSEM_XCHGADD_ALGORITHM
  140. bool
  141. config ARCH_HAS_ILOG2_U32
  142. bool
  143. config ARCH_HAS_ILOG2_U64
  144. bool
  145. config ARCH_HAS_CPUFREQ
  146. bool
  147. help
  148. Internal node to signify that the ARCH has CPUFREQ support
  149. and that the relevant menu configurations are displayed for
  150. it.
  151. config ARCH_HAS_BANDGAP
  152. bool
  153. config GENERIC_HWEIGHT
  154. bool
  155. default y
  156. config GENERIC_CALIBRATE_DELAY
  157. bool
  158. default y
  159. config ARCH_MAY_HAVE_PC_FDC
  160. bool
  161. config ZONE_DMA
  162. bool
  163. config NEED_DMA_MAP_STATE
  164. def_bool y
  165. config ARCH_HAS_DMA_SET_COHERENT_MASK
  166. bool
  167. config GENERIC_ISA_DMA
  168. bool
  169. config FIQ
  170. bool
  171. config NEED_RET_TO_USER
  172. bool
  173. config ARCH_MTD_XIP
  174. bool
  175. config VECTORS_BASE
  176. hex
  177. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  178. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  179. default 0x00000000
  180. help
  181. The base address of exception vectors. This must be two pages
  182. in size.
  183. config ARM_PATCH_PHYS_VIRT
  184. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  185. default y
  186. depends on !XIP_KERNEL && MMU
  187. depends on !ARCH_REALVIEW || !SPARSEMEM
  188. help
  189. Patch phys-to-virt and virt-to-phys translation functions at
  190. boot and module load time according to the position of the
  191. kernel in system memory.
  192. This can only be used with non-XIP MMU kernels where the base
  193. of physical memory is at a 16MB boundary.
  194. Only disable this option if you know that you do not require
  195. this feature (eg, building a kernel for a single machine) and
  196. you need to shrink the kernel to the minimal size.
  197. config NEED_MACH_GPIO_H
  198. bool
  199. help
  200. Select this when mach/gpio.h is required to provide special
  201. definitions for this platform. The need for mach/gpio.h should
  202. be avoided when possible.
  203. config NEED_MACH_IO_H
  204. bool
  205. help
  206. Select this when mach/io.h is required to provide special
  207. definitions for this platform. The need for mach/io.h should
  208. be avoided when possible.
  209. config NEED_MACH_MEMORY_H
  210. bool
  211. help
  212. Select this when mach/memory.h is required to provide special
  213. definitions for this platform. The need for mach/memory.h should
  214. be avoided when possible.
  215. config PHYS_OFFSET
  216. hex "Physical address of main memory" if MMU
  217. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  218. default DRAM_BASE if !MMU
  219. help
  220. Please provide the physical address corresponding to the
  221. location of main memory in your system.
  222. config GENERIC_BUG
  223. def_bool y
  224. depends on BUG
  225. source "init/Kconfig"
  226. source "kernel/Kconfig.freezer"
  227. menu "System Type"
  228. config MMU
  229. bool "MMU-based Paged Memory Management Support"
  230. default y
  231. help
  232. Select if you want MMU-based virtualised addressing space
  233. support by paged memory management. If unsure, say 'Y'.
  234. #
  235. # The "ARM system type" choice list is ordered alphabetically by option
  236. # text. Please add new entries in the option alphabetic order.
  237. #
  238. choice
  239. prompt "ARM system type"
  240. default ARCH_VERSATILE if !MMU
  241. default ARCH_MULTIPLATFORM if MMU
  242. config ARCH_MULTIPLATFORM
  243. bool "Allow multiple platforms to be selected"
  244. depends on MMU
  245. select ARM_PATCH_PHYS_VIRT
  246. select AUTO_ZRELADDR
  247. select COMMON_CLK
  248. select MULTI_IRQ_HANDLER
  249. select SPARSE_IRQ
  250. select USE_OF
  251. config ARCH_INTEGRATOR
  252. bool "ARM Ltd. Integrator family"
  253. select ARCH_HAS_CPUFREQ
  254. select ARM_AMBA
  255. select COMMON_CLK
  256. select COMMON_CLK_VERSATILE
  257. select GENERIC_CLOCKEVENTS
  258. select HAVE_TCM
  259. select ICST
  260. select MULTI_IRQ_HANDLER
  261. select NEED_MACH_MEMORY_H
  262. select PLAT_VERSATILE
  263. select SPARSE_IRQ
  264. select VERSATILE_FPGA_IRQ
  265. help
  266. Support for ARM's Integrator platform.
  267. config ARCH_REALVIEW
  268. bool "ARM Ltd. RealView family"
  269. select ARCH_WANT_OPTIONAL_GPIOLIB
  270. select ARM_AMBA
  271. select ARM_TIMER_SP804
  272. select COMMON_CLK
  273. select COMMON_CLK_VERSATILE
  274. select GENERIC_CLOCKEVENTS
  275. select GPIO_PL061 if GPIOLIB
  276. select ICST
  277. select NEED_MACH_MEMORY_H
  278. select PLAT_VERSATILE
  279. select PLAT_VERSATILE_CLCD
  280. help
  281. This enables support for ARM Ltd RealView boards.
  282. config ARCH_VERSATILE
  283. bool "ARM Ltd. Versatile family"
  284. select ARCH_WANT_OPTIONAL_GPIOLIB
  285. select ARM_AMBA
  286. select ARM_TIMER_SP804
  287. select ARM_VIC
  288. select CLKDEV_LOOKUP
  289. select GENERIC_CLOCKEVENTS
  290. select HAVE_MACH_CLKDEV
  291. select ICST
  292. select PLAT_VERSATILE
  293. select PLAT_VERSATILE_CLCD
  294. select PLAT_VERSATILE_CLOCK
  295. select VERSATILE_FPGA_IRQ
  296. help
  297. This enables support for ARM Ltd Versatile board.
  298. config ARCH_AT91
  299. bool "Atmel AT91"
  300. select ARCH_REQUIRE_GPIOLIB
  301. select CLKDEV_LOOKUP
  302. select HAVE_CLK
  303. select IRQ_DOMAIN
  304. select NEED_MACH_GPIO_H
  305. select NEED_MACH_IO_H if PCCARD
  306. select PINCTRL
  307. select PINCTRL_AT91 if USE_OF
  308. help
  309. This enables support for systems based on Atmel
  310. AT91RM9200 and AT91SAM9* processors.
  311. config ARCH_CLPS711X
  312. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  313. select ARCH_REQUIRE_GPIOLIB
  314. select AUTO_ZRELADDR
  315. select CLKDEV_LOOKUP
  316. select CLKSRC_MMIO
  317. select COMMON_CLK
  318. select CPU_ARM720T
  319. select GENERIC_CLOCKEVENTS
  320. select MFD_SYSCON
  321. select MULTI_IRQ_HANDLER
  322. select SPARSE_IRQ
  323. help
  324. Support for Cirrus Logic 711x/721x/731x based boards.
  325. config ARCH_GEMINI
  326. bool "Cortina Systems Gemini"
  327. select ARCH_REQUIRE_GPIOLIB
  328. select ARCH_USES_GETTIMEOFFSET
  329. select NEED_MACH_GPIO_H
  330. select CPU_FA526
  331. help
  332. Support for the Cortina Systems Gemini family SoCs
  333. config ARCH_EBSA110
  334. bool "EBSA-110"
  335. select ARCH_USES_GETTIMEOFFSET
  336. select CPU_SA110
  337. select ISA
  338. select NEED_MACH_IO_H
  339. select NEED_MACH_MEMORY_H
  340. select NO_IOPORT
  341. help
  342. This is an evaluation board for the StrongARM processor available
  343. from Digital. It has limited hardware on-board, including an
  344. Ethernet interface, two PCMCIA sockets, two serial ports and a
  345. parallel port.
  346. config ARCH_EP93XX
  347. bool "EP93xx-based"
  348. select ARCH_HAS_HOLES_MEMORYMODEL
  349. select ARCH_REQUIRE_GPIOLIB
  350. select ARCH_USES_GETTIMEOFFSET
  351. select ARM_AMBA
  352. select ARM_VIC
  353. select CLKDEV_LOOKUP
  354. select CPU_ARM920T
  355. select NEED_MACH_MEMORY_H
  356. help
  357. This enables support for the Cirrus EP93xx series of CPUs.
  358. config ARCH_FOOTBRIDGE
  359. bool "FootBridge"
  360. select CPU_SA110
  361. select FOOTBRIDGE
  362. select GENERIC_CLOCKEVENTS
  363. select HAVE_IDE
  364. select NEED_MACH_IO_H if !MMU
  365. select NEED_MACH_MEMORY_H
  366. help
  367. Support for systems based on the DC21285 companion chip
  368. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  369. config ARCH_NETX
  370. bool "Hilscher NetX based"
  371. select ARM_VIC
  372. select CLKSRC_MMIO
  373. select CPU_ARM926T
  374. select GENERIC_CLOCKEVENTS
  375. help
  376. This enables support for systems based on the Hilscher NetX Soc
  377. config ARCH_IOP13XX
  378. bool "IOP13xx-based"
  379. depends on MMU
  380. select ARCH_SUPPORTS_MSI
  381. select CPU_XSC3
  382. select NEED_MACH_MEMORY_H
  383. select NEED_RET_TO_USER
  384. select PCI
  385. select PLAT_IOP
  386. select VMSPLIT_1G
  387. help
  388. Support for Intel's IOP13XX (XScale) family of processors.
  389. config ARCH_IOP32X
  390. bool "IOP32x-based"
  391. depends on MMU
  392. select ARCH_REQUIRE_GPIOLIB
  393. select CPU_XSCALE
  394. select NEED_MACH_GPIO_H
  395. select NEED_RET_TO_USER
  396. select PCI
  397. select PLAT_IOP
  398. help
  399. Support for Intel's 80219 and IOP32X (XScale) family of
  400. processors.
  401. config ARCH_IOP33X
  402. bool "IOP33x-based"
  403. depends on MMU
  404. select ARCH_REQUIRE_GPIOLIB
  405. select CPU_XSCALE
  406. select NEED_MACH_GPIO_H
  407. select NEED_RET_TO_USER
  408. select PCI
  409. select PLAT_IOP
  410. help
  411. Support for Intel's IOP33X (XScale) family of processors.
  412. config ARCH_IXP4XX
  413. bool "IXP4xx-based"
  414. depends on MMU
  415. select ARCH_HAS_DMA_SET_COHERENT_MASK
  416. select ARCH_REQUIRE_GPIOLIB
  417. select CLKSRC_MMIO
  418. select CPU_XSCALE
  419. select DMABOUNCE if PCI
  420. select GENERIC_CLOCKEVENTS
  421. select MIGHT_HAVE_PCI
  422. select NEED_MACH_IO_H
  423. select USB_EHCI_BIG_ENDIAN_MMIO
  424. select USB_EHCI_BIG_ENDIAN_DESC
  425. help
  426. Support for Intel's IXP4XX (XScale) family of processors.
  427. config ARCH_DOVE
  428. bool "Marvell Dove"
  429. select ARCH_REQUIRE_GPIOLIB
  430. select CPU_PJ4
  431. select GENERIC_CLOCKEVENTS
  432. select MIGHT_HAVE_PCI
  433. select PINCTRL
  434. select PINCTRL_DOVE
  435. select PLAT_ORION_LEGACY
  436. select USB_ARCH_HAS_EHCI
  437. select MVEBU_MBUS
  438. help
  439. Support for the Marvell Dove SoC 88AP510
  440. config ARCH_KIRKWOOD
  441. bool "Marvell Kirkwood"
  442. select ARCH_HAS_CPUFREQ
  443. select ARCH_REQUIRE_GPIOLIB
  444. select CPU_FEROCEON
  445. select GENERIC_CLOCKEVENTS
  446. select PCI
  447. select PCI_QUIRKS
  448. select PINCTRL
  449. select PINCTRL_KIRKWOOD
  450. select PLAT_ORION_LEGACY
  451. select MVEBU_MBUS
  452. help
  453. Support for the following Marvell Kirkwood series SoCs:
  454. 88F6180, 88F6192 and 88F6281.
  455. config ARCH_MV78XX0
  456. bool "Marvell MV78xx0"
  457. select ARCH_REQUIRE_GPIOLIB
  458. select CPU_FEROCEON
  459. select GENERIC_CLOCKEVENTS
  460. select PCI
  461. select PLAT_ORION_LEGACY
  462. select MVEBU_MBUS
  463. help
  464. Support for the following Marvell MV78xx0 series SoCs:
  465. MV781x0, MV782x0.
  466. config ARCH_ORION5X
  467. bool "Marvell Orion"
  468. depends on MMU
  469. select ARCH_REQUIRE_GPIOLIB
  470. select CPU_FEROCEON
  471. select GENERIC_CLOCKEVENTS
  472. select PCI
  473. select PLAT_ORION_LEGACY
  474. select MVEBU_MBUS
  475. help
  476. Support for the following Marvell Orion 5x series SoCs:
  477. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  478. Orion-2 (5281), Orion-1-90 (6183).
  479. config ARCH_MMP
  480. bool "Marvell PXA168/910/MMP2"
  481. depends on MMU
  482. select ARCH_REQUIRE_GPIOLIB
  483. select CLKDEV_LOOKUP
  484. select GENERIC_ALLOCATOR
  485. select GENERIC_CLOCKEVENTS
  486. select GPIO_PXA
  487. select IRQ_DOMAIN
  488. select NEED_MACH_GPIO_H
  489. select PINCTRL
  490. select PLAT_PXA
  491. select SPARSE_IRQ
  492. help
  493. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  494. config ARCH_KS8695
  495. bool "Micrel/Kendin KS8695"
  496. select ARCH_REQUIRE_GPIOLIB
  497. select CLKSRC_MMIO
  498. select CPU_ARM922T
  499. select GENERIC_CLOCKEVENTS
  500. select NEED_MACH_MEMORY_H
  501. help
  502. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  503. System-on-Chip devices.
  504. config ARCH_W90X900
  505. bool "Nuvoton W90X900 CPU"
  506. select ARCH_REQUIRE_GPIOLIB
  507. select CLKDEV_LOOKUP
  508. select CLKSRC_MMIO
  509. select CPU_ARM926T
  510. select GENERIC_CLOCKEVENTS
  511. help
  512. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  513. At present, the w90x900 has been renamed nuc900, regarding
  514. the ARM series product line, you can login the following
  515. link address to know more.
  516. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  517. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  518. config ARCH_LPC32XX
  519. bool "NXP LPC32XX"
  520. select ARCH_REQUIRE_GPIOLIB
  521. select ARM_AMBA
  522. select CLKDEV_LOOKUP
  523. select CLKSRC_MMIO
  524. select CPU_ARM926T
  525. select GENERIC_CLOCKEVENTS
  526. select HAVE_IDE
  527. select HAVE_PWM
  528. select USB_ARCH_HAS_OHCI
  529. select USE_OF
  530. help
  531. Support for the NXP LPC32XX family of processors
  532. config ARCH_PXA
  533. bool "PXA2xx/PXA3xx-based"
  534. depends on MMU
  535. select ARCH_HAS_CPUFREQ
  536. select ARCH_MTD_XIP
  537. select ARCH_REQUIRE_GPIOLIB
  538. select ARM_CPU_SUSPEND if PM
  539. select AUTO_ZRELADDR
  540. select CLKDEV_LOOKUP
  541. select CLKSRC_MMIO
  542. select GENERIC_CLOCKEVENTS
  543. select GPIO_PXA
  544. select HAVE_IDE
  545. select MULTI_IRQ_HANDLER
  546. select NEED_MACH_GPIO_H
  547. select PLAT_PXA
  548. select SPARSE_IRQ
  549. help
  550. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  551. config ARCH_MSM
  552. bool "Qualcomm MSM"
  553. select ARCH_REQUIRE_GPIOLIB
  554. select CLKDEV_LOOKUP
  555. select COMMON_CLK
  556. select GENERIC_CLOCKEVENTS
  557. help
  558. Support for Qualcomm MSM/QSD based systems. This runs on the
  559. apps processor of the MSM/QSD and depends on a shared memory
  560. interface to the modem processor which runs the baseband
  561. stack and controls some vital subsystems
  562. (clock and power control, etc).
  563. config ARCH_SHMOBILE
  564. bool "Renesas SH-Mobile / R-Mobile"
  565. select ARM_PATCH_PHYS_VIRT
  566. select CLKDEV_LOOKUP
  567. select GENERIC_CLOCKEVENTS
  568. select HAVE_ARM_SCU if SMP
  569. select HAVE_ARM_TWD if LOCAL_TIMERS
  570. select HAVE_CLK
  571. select HAVE_MACH_CLKDEV
  572. select HAVE_SMP
  573. select MIGHT_HAVE_CACHE_L2X0
  574. select MULTI_IRQ_HANDLER
  575. select NO_IOPORT
  576. select PINCTRL
  577. select PM_GENERIC_DOMAINS if PM
  578. select SPARSE_IRQ
  579. help
  580. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  581. config ARCH_RPC
  582. bool "RiscPC"
  583. select ARCH_ACORN
  584. select ARCH_MAY_HAVE_PC_FDC
  585. select ARCH_SPARSEMEM_ENABLE
  586. select ARCH_USES_GETTIMEOFFSET
  587. select FIQ
  588. select HAVE_IDE
  589. select HAVE_PATA_PLATFORM
  590. select ISA_DMA_API
  591. select NEED_MACH_IO_H
  592. select NEED_MACH_MEMORY_H
  593. select NO_IOPORT
  594. select VIRT_TO_BUS
  595. help
  596. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  597. CD-ROM interface, serial and parallel port, and the floppy drive.
  598. config ARCH_SA1100
  599. bool "SA1100-based"
  600. select ARCH_HAS_CPUFREQ
  601. select ARCH_MTD_XIP
  602. select ARCH_REQUIRE_GPIOLIB
  603. select ARCH_SPARSEMEM_ENABLE
  604. select CLKDEV_LOOKUP
  605. select CLKSRC_MMIO
  606. select CPU_FREQ
  607. select CPU_SA1100
  608. select GENERIC_CLOCKEVENTS
  609. select HAVE_IDE
  610. select ISA
  611. select NEED_MACH_GPIO_H
  612. select NEED_MACH_MEMORY_H
  613. select SPARSE_IRQ
  614. help
  615. Support for StrongARM 11x0 based boards.
  616. config ARCH_S3C24XX
  617. bool "Samsung S3C24XX SoCs"
  618. select ARCH_HAS_CPUFREQ
  619. select ARCH_REQUIRE_GPIOLIB
  620. select CLKDEV_LOOKUP
  621. select CLKSRC_MMIO
  622. select GENERIC_CLOCKEVENTS
  623. select GPIO_SAMSUNG
  624. select HAVE_CLK
  625. select HAVE_S3C2410_I2C if I2C
  626. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  627. select HAVE_S3C_RTC if RTC_CLASS
  628. select MULTI_IRQ_HANDLER
  629. select NEED_MACH_GPIO_H
  630. select NEED_MACH_IO_H
  631. select SAMSUNG_ATAGS
  632. help
  633. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  634. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  635. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  636. Samsung SMDK2410 development board (and derivatives).
  637. config ARCH_S3C64XX
  638. bool "Samsung S3C64XX"
  639. select ARCH_HAS_CPUFREQ
  640. select ARCH_REQUIRE_GPIOLIB
  641. select ARM_VIC
  642. select CLKDEV_LOOKUP
  643. select CLKSRC_MMIO
  644. select CPU_V6
  645. select GENERIC_CLOCKEVENTS
  646. select GPIO_SAMSUNG
  647. select HAVE_CLK
  648. select HAVE_S3C2410_I2C if I2C
  649. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  650. select HAVE_TCM
  651. select NEED_MACH_GPIO_H
  652. select NO_IOPORT
  653. select PLAT_SAMSUNG
  654. select S3C_DEV_NAND
  655. select S3C_GPIO_TRACK
  656. select SAMSUNG_ATAGS
  657. select SAMSUNG_CLKSRC
  658. select SAMSUNG_GPIOLIB_4BIT
  659. select SAMSUNG_IRQ_VIC_TIMER
  660. select SAMSUNG_WDT_RESET
  661. select USB_ARCH_HAS_OHCI
  662. help
  663. Samsung S3C64XX series based systems
  664. config ARCH_S5P64X0
  665. bool "Samsung S5P6440 S5P6450"
  666. select CLKDEV_LOOKUP
  667. select CLKSRC_MMIO
  668. select CPU_V6
  669. select GENERIC_CLOCKEVENTS
  670. select GPIO_SAMSUNG
  671. select HAVE_CLK
  672. select HAVE_S3C2410_I2C if I2C
  673. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  674. select HAVE_S3C_RTC if RTC_CLASS
  675. select NEED_MACH_GPIO_H
  676. select SAMSUNG_WDT_RESET
  677. select SAMSUNG_ATAGS
  678. help
  679. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  680. SMDK6450.
  681. config ARCH_S5PC100
  682. bool "Samsung S5PC100"
  683. select ARCH_REQUIRE_GPIOLIB
  684. select CLKDEV_LOOKUP
  685. select CLKSRC_MMIO
  686. select CPU_V7
  687. select GENERIC_CLOCKEVENTS
  688. select GPIO_SAMSUNG
  689. select HAVE_CLK
  690. select HAVE_S3C2410_I2C if I2C
  691. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  692. select HAVE_S3C_RTC if RTC_CLASS
  693. select NEED_MACH_GPIO_H
  694. select SAMSUNG_WDT_RESET
  695. select SAMSUNG_ATAGS
  696. help
  697. Samsung S5PC100 series based systems
  698. config ARCH_S5PV210
  699. bool "Samsung S5PV210/S5PC110"
  700. select ARCH_HAS_CPUFREQ
  701. select ARCH_HAS_HOLES_MEMORYMODEL
  702. select ARCH_SPARSEMEM_ENABLE
  703. select CLKDEV_LOOKUP
  704. select CLKSRC_MMIO
  705. select CPU_V7
  706. select GENERIC_CLOCKEVENTS
  707. select GPIO_SAMSUNG
  708. select HAVE_CLK
  709. select HAVE_S3C2410_I2C if I2C
  710. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  711. select HAVE_S3C_RTC if RTC_CLASS
  712. select NEED_MACH_GPIO_H
  713. select NEED_MACH_MEMORY_H
  714. select SAMSUNG_ATAGS
  715. help
  716. Samsung S5PV210/S5PC110 series based systems
  717. config ARCH_EXYNOS
  718. bool "Samsung EXYNOS"
  719. select ARCH_HAS_CPUFREQ
  720. select ARCH_HAS_HOLES_MEMORYMODEL
  721. select ARCH_REQUIRE_GPIOLIB
  722. select ARCH_SPARSEMEM_ENABLE
  723. select ARM_GIC
  724. select CLKDEV_LOOKUP
  725. select COMMON_CLK
  726. select CPU_V7
  727. select GENERIC_CLOCKEVENTS
  728. select HAVE_CLK
  729. select HAVE_S3C2410_I2C if I2C
  730. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  731. select HAVE_S3C_RTC if RTC_CLASS
  732. select NEED_MACH_MEMORY_H
  733. select SPARSE_IRQ
  734. select USE_OF
  735. help
  736. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  737. config ARCH_SHARK
  738. bool "Shark"
  739. select ARCH_USES_GETTIMEOFFSET
  740. select CPU_SA110
  741. select ISA
  742. select ISA_DMA
  743. select NEED_MACH_MEMORY_H
  744. select PCI
  745. select VIRT_TO_BUS
  746. select ZONE_DMA
  747. help
  748. Support for the StrongARM based Digital DNARD machine, also known
  749. as "Shark" (<http://www.shark-linux.de/shark.html>).
  750. config ARCH_DAVINCI
  751. bool "TI DaVinci"
  752. select ARCH_HAS_HOLES_MEMORYMODEL
  753. select ARCH_REQUIRE_GPIOLIB
  754. select CLKDEV_LOOKUP
  755. select GENERIC_ALLOCATOR
  756. select GENERIC_CLOCKEVENTS
  757. select GENERIC_IRQ_CHIP
  758. select HAVE_IDE
  759. select NEED_MACH_GPIO_H
  760. select TI_PRIV_EDMA
  761. select USE_OF
  762. select ZONE_DMA
  763. help
  764. Support for TI's DaVinci platform.
  765. config ARCH_OMAP1
  766. bool "TI OMAP1"
  767. depends on MMU
  768. select ARCH_HAS_CPUFREQ
  769. select ARCH_HAS_HOLES_MEMORYMODEL
  770. select ARCH_OMAP
  771. select ARCH_REQUIRE_GPIOLIB
  772. select CLKDEV_LOOKUP
  773. select CLKSRC_MMIO
  774. select GENERIC_CLOCKEVENTS
  775. select GENERIC_IRQ_CHIP
  776. select HAVE_CLK
  777. select HAVE_IDE
  778. select IRQ_DOMAIN
  779. select NEED_MACH_IO_H if PCCARD
  780. select NEED_MACH_MEMORY_H
  781. help
  782. Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
  783. endchoice
  784. menu "Multiple platform selection"
  785. depends on ARCH_MULTIPLATFORM
  786. comment "CPU Core family selection"
  787. config ARCH_MULTI_V4T
  788. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  789. depends on !ARCH_MULTI_V6_V7
  790. select ARCH_MULTI_V4_V5
  791. select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
  792. CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
  793. CPU_ARM925T || CPU_ARM940T)
  794. config ARCH_MULTI_V5
  795. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  796. depends on !ARCH_MULTI_V6_V7
  797. select ARCH_MULTI_V4_V5
  798. select CPU_ARM926T if (!CPU_ARM946E || CPU_ARM1020 || \
  799. CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
  800. CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
  801. config ARCH_MULTI_V4_V5
  802. bool
  803. config ARCH_MULTI_V6
  804. bool "ARMv6 based platforms (ARM11)"
  805. select ARCH_MULTI_V6_V7
  806. select CPU_V6
  807. config ARCH_MULTI_V7
  808. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  809. default y
  810. select ARCH_MULTI_V6_V7
  811. select CPU_V7
  812. config ARCH_MULTI_V6_V7
  813. bool
  814. config ARCH_MULTI_CPU_AUTO
  815. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  816. select ARCH_MULTI_V5
  817. endmenu
  818. #
  819. # This is sorted alphabetically by mach-* pathname. However, plat-*
  820. # Kconfigs may be included either alphabetically (according to the
  821. # plat- suffix) or along side the corresponding mach-* source.
  822. #
  823. source "arch/arm/mach-mvebu/Kconfig"
  824. source "arch/arm/mach-at91/Kconfig"
  825. source "arch/arm/mach-bcm/Kconfig"
  826. source "arch/arm/mach-bcm2835/Kconfig"
  827. source "arch/arm/mach-clps711x/Kconfig"
  828. source "arch/arm/mach-cns3xxx/Kconfig"
  829. source "arch/arm/mach-davinci/Kconfig"
  830. source "arch/arm/mach-dove/Kconfig"
  831. source "arch/arm/mach-ep93xx/Kconfig"
  832. source "arch/arm/mach-footbridge/Kconfig"
  833. source "arch/arm/mach-gemini/Kconfig"
  834. source "arch/arm/mach-highbank/Kconfig"
  835. source "arch/arm/mach-integrator/Kconfig"
  836. source "arch/arm/mach-iop32x/Kconfig"
  837. source "arch/arm/mach-iop33x/Kconfig"
  838. source "arch/arm/mach-iop13xx/Kconfig"
  839. source "arch/arm/mach-ixp4xx/Kconfig"
  840. source "arch/arm/mach-keystone/Kconfig"
  841. source "arch/arm/mach-kirkwood/Kconfig"
  842. source "arch/arm/mach-ks8695/Kconfig"
  843. source "arch/arm/mach-msm/Kconfig"
  844. source "arch/arm/mach-mv78xx0/Kconfig"
  845. source "arch/arm/mach-imx/Kconfig"
  846. source "arch/arm/mach-mxs/Kconfig"
  847. source "arch/arm/mach-netx/Kconfig"
  848. source "arch/arm/mach-nomadik/Kconfig"
  849. source "arch/arm/mach-nspire/Kconfig"
  850. source "arch/arm/plat-omap/Kconfig"
  851. source "arch/arm/mach-omap1/Kconfig"
  852. source "arch/arm/mach-omap2/Kconfig"
  853. source "arch/arm/mach-orion5x/Kconfig"
  854. source "arch/arm/mach-picoxcell/Kconfig"
  855. source "arch/arm/mach-pxa/Kconfig"
  856. source "arch/arm/plat-pxa/Kconfig"
  857. source "arch/arm/mach-mmp/Kconfig"
  858. source "arch/arm/mach-realview/Kconfig"
  859. source "arch/arm/mach-rockchip/Kconfig"
  860. source "arch/arm/mach-sa1100/Kconfig"
  861. source "arch/arm/plat-samsung/Kconfig"
  862. source "arch/arm/mach-socfpga/Kconfig"
  863. source "arch/arm/mach-spear/Kconfig"
  864. source "arch/arm/mach-sti/Kconfig"
  865. source "arch/arm/mach-s3c24xx/Kconfig"
  866. if ARCH_S3C64XX
  867. source "arch/arm/mach-s3c64xx/Kconfig"
  868. endif
  869. source "arch/arm/mach-s5p64x0/Kconfig"
  870. source "arch/arm/mach-s5pc100/Kconfig"
  871. source "arch/arm/mach-s5pv210/Kconfig"
  872. source "arch/arm/mach-exynos/Kconfig"
  873. source "arch/arm/mach-shmobile/Kconfig"
  874. source "arch/arm/mach-sunxi/Kconfig"
  875. source "arch/arm/mach-prima2/Kconfig"
  876. source "arch/arm/mach-tegra/Kconfig"
  877. source "arch/arm/mach-u300/Kconfig"
  878. source "arch/arm/mach-ux500/Kconfig"
  879. source "arch/arm/mach-versatile/Kconfig"
  880. source "arch/arm/mach-vexpress/Kconfig"
  881. source "arch/arm/plat-versatile/Kconfig"
  882. source "arch/arm/mach-virt/Kconfig"
  883. source "arch/arm/mach-vt8500/Kconfig"
  884. source "arch/arm/mach-w90x900/Kconfig"
  885. source "arch/arm/mach-zynq/Kconfig"
  886. # Definitions to make life easier
  887. config ARCH_ACORN
  888. bool
  889. config PLAT_IOP
  890. bool
  891. select GENERIC_CLOCKEVENTS
  892. config PLAT_ORION
  893. bool
  894. select CLKSRC_MMIO
  895. select COMMON_CLK
  896. select GENERIC_IRQ_CHIP
  897. select IRQ_DOMAIN
  898. config PLAT_ORION_LEGACY
  899. bool
  900. select PLAT_ORION
  901. config PLAT_PXA
  902. bool
  903. config PLAT_VERSATILE
  904. bool
  905. config ARM_TIMER_SP804
  906. bool
  907. select CLKSRC_MMIO
  908. select CLKSRC_OF if OF
  909. source arch/arm/mm/Kconfig
  910. config ARM_NR_BANKS
  911. int
  912. default 16 if ARCH_EP93XX
  913. default 8
  914. config IWMMXT
  915. bool "Enable iWMMXt support" if !CPU_PJ4
  916. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  917. default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
  918. help
  919. Enable support for iWMMXt context switching at run time if
  920. running on a CPU that supports it.
  921. config XSCALE_PMU
  922. bool
  923. depends on CPU_XSCALE
  924. default y
  925. config MULTI_IRQ_HANDLER
  926. bool
  927. help
  928. Allow each machine to specify it's own IRQ handler at run time.
  929. if !MMU
  930. source "arch/arm/Kconfig-nommu"
  931. endif
  932. config PJ4B_ERRATA_4742
  933. bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
  934. depends on CPU_PJ4B && MACH_ARMADA_370
  935. default y
  936. help
  937. When coming out of either a Wait for Interrupt (WFI) or a Wait for
  938. Event (WFE) IDLE states, a specific timing sensitivity exists between
  939. the retiring WFI/WFE instructions and the newly issued subsequent
  940. instructions. This sensitivity can result in a CPU hang scenario.
  941. Workaround:
  942. The software must insert either a Data Synchronization Barrier (DSB)
  943. or Data Memory Barrier (DMB) command immediately after the WFI/WFE
  944. instruction
  945. config ARM_ERRATA_326103
  946. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  947. depends on CPU_V6
  948. help
  949. Executing a SWP instruction to read-only memory does not set bit 11
  950. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  951. treat the access as a read, preventing a COW from occurring and
  952. causing the faulting task to livelock.
  953. config ARM_ERRATA_411920
  954. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  955. depends on CPU_V6 || CPU_V6K
  956. help
  957. Invalidation of the Instruction Cache operation can
  958. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  959. It does not affect the MPCore. This option enables the ARM Ltd.
  960. recommended workaround.
  961. config ARM_ERRATA_430973
  962. bool "ARM errata: Stale prediction on replaced interworking branch"
  963. depends on CPU_V7
  964. help
  965. This option enables the workaround for the 430973 Cortex-A8
  966. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  967. interworking branch is replaced with another code sequence at the
  968. same virtual address, whether due to self-modifying code or virtual
  969. to physical address re-mapping, Cortex-A8 does not recover from the
  970. stale interworking branch prediction. This results in Cortex-A8
  971. executing the new code sequence in the incorrect ARM or Thumb state.
  972. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  973. and also flushes the branch target cache at every context switch.
  974. Note that setting specific bits in the ACTLR register may not be
  975. available in non-secure mode.
  976. config ARM_ERRATA_458693
  977. bool "ARM errata: Processor deadlock when a false hazard is created"
  978. depends on CPU_V7
  979. depends on !ARCH_MULTIPLATFORM
  980. help
  981. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  982. erratum. For very specific sequences of memory operations, it is
  983. possible for a hazard condition intended for a cache line to instead
  984. be incorrectly associated with a different cache line. This false
  985. hazard might then cause a processor deadlock. The workaround enables
  986. the L1 caching of the NEON accesses and disables the PLD instruction
  987. in the ACTLR register. Note that setting specific bits in the ACTLR
  988. register may not be available in non-secure mode.
  989. config ARM_ERRATA_460075
  990. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  991. depends on CPU_V7
  992. depends on !ARCH_MULTIPLATFORM
  993. help
  994. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  995. erratum. Any asynchronous access to the L2 cache may encounter a
  996. situation in which recent store transactions to the L2 cache are lost
  997. and overwritten with stale memory contents from external memory. The
  998. workaround disables the write-allocate mode for the L2 cache via the
  999. ACTLR register. Note that setting specific bits in the ACTLR register
  1000. may not be available in non-secure mode.
  1001. config ARM_ERRATA_742230
  1002. bool "ARM errata: DMB operation may be faulty"
  1003. depends on CPU_V7 && SMP
  1004. depends on !ARCH_MULTIPLATFORM
  1005. help
  1006. This option enables the workaround for the 742230 Cortex-A9
  1007. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  1008. between two write operations may not ensure the correct visibility
  1009. ordering of the two writes. This workaround sets a specific bit in
  1010. the diagnostic register of the Cortex-A9 which causes the DMB
  1011. instruction to behave as a DSB, ensuring the correct behaviour of
  1012. the two writes.
  1013. config ARM_ERRATA_742231
  1014. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  1015. depends on CPU_V7 && SMP
  1016. depends on !ARCH_MULTIPLATFORM
  1017. help
  1018. This option enables the workaround for the 742231 Cortex-A9
  1019. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  1020. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  1021. accessing some data located in the same cache line, may get corrupted
  1022. data due to bad handling of the address hazard when the line gets
  1023. replaced from one of the CPUs at the same time as another CPU is
  1024. accessing it. This workaround sets specific bits in the diagnostic
  1025. register of the Cortex-A9 which reduces the linefill issuing
  1026. capabilities of the processor.
  1027. config PL310_ERRATA_588369
  1028. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  1029. depends on CACHE_L2X0
  1030. help
  1031. The PL310 L2 cache controller implements three types of Clean &
  1032. Invalidate maintenance operations: by Physical Address
  1033. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1034. They are architecturally defined to behave as the execution of a
  1035. clean operation followed immediately by an invalidate operation,
  1036. both performing to the same memory location. This functionality
  1037. is not correctly implemented in PL310 as clean lines are not
  1038. invalidated as a result of these operations.
  1039. config ARM_ERRATA_643719
  1040. bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
  1041. depends on CPU_V7 && SMP
  1042. help
  1043. This option enables the workaround for the 643719 Cortex-A9 (prior to
  1044. r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
  1045. register returns zero when it should return one. The workaround
  1046. corrects this value, ensuring cache maintenance operations which use
  1047. it behave as intended and avoiding data corruption.
  1048. config ARM_ERRATA_720789
  1049. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1050. depends on CPU_V7
  1051. help
  1052. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1053. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1054. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1055. As a consequence of this erratum, some TLB entries which should be
  1056. invalidated are not, resulting in an incoherency in the system page
  1057. tables. The workaround changes the TLB flushing routines to invalidate
  1058. entries regardless of the ASID.
  1059. config PL310_ERRATA_727915
  1060. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1061. depends on CACHE_L2X0
  1062. help
  1063. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1064. operation (offset 0x7FC). This operation runs in background so that
  1065. PL310 can handle normal accesses while it is in progress. Under very
  1066. rare circumstances, due to this erratum, write data can be lost when
  1067. PL310 treats a cacheable write transaction during a Clean &
  1068. Invalidate by Way operation.
  1069. config ARM_ERRATA_743622
  1070. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1071. depends on CPU_V7
  1072. depends on !ARCH_MULTIPLATFORM
  1073. help
  1074. This option enables the workaround for the 743622 Cortex-A9
  1075. (r2p*) erratum. Under very rare conditions, a faulty
  1076. optimisation in the Cortex-A9 Store Buffer may lead to data
  1077. corruption. This workaround sets a specific bit in the diagnostic
  1078. register of the Cortex-A9 which disables the Store Buffer
  1079. optimisation, preventing the defect from occurring. This has no
  1080. visible impact on the overall performance or power consumption of the
  1081. processor.
  1082. config ARM_ERRATA_751472
  1083. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1084. depends on CPU_V7
  1085. depends on !ARCH_MULTIPLATFORM
  1086. help
  1087. This option enables the workaround for the 751472 Cortex-A9 (prior
  1088. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1089. completion of a following broadcasted operation if the second
  1090. operation is received by a CPU before the ICIALLUIS has completed,
  1091. potentially leading to corrupted entries in the cache or TLB.
  1092. config PL310_ERRATA_753970
  1093. bool "PL310 errata: cache sync operation may be faulty"
  1094. depends on CACHE_PL310
  1095. help
  1096. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1097. Under some condition the effect of cache sync operation on
  1098. the store buffer still remains when the operation completes.
  1099. This means that the store buffer is always asked to drain and
  1100. this prevents it from merging any further writes. The workaround
  1101. is to replace the normal offset of cache sync operation (0x730)
  1102. by another offset targeting an unmapped PL310 register 0x740.
  1103. This has the same effect as the cache sync operation: store buffer
  1104. drain and waiting for all buffers empty.
  1105. config ARM_ERRATA_754322
  1106. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1107. depends on CPU_V7
  1108. help
  1109. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1110. r3p*) erratum. A speculative memory access may cause a page table walk
  1111. which starts prior to an ASID switch but completes afterwards. This
  1112. can populate the micro-TLB with a stale entry which may be hit with
  1113. the new ASID. This workaround places two dsb instructions in the mm
  1114. switching code so that no page table walks can cross the ASID switch.
  1115. config ARM_ERRATA_754327
  1116. bool "ARM errata: no automatic Store Buffer drain"
  1117. depends on CPU_V7 && SMP
  1118. help
  1119. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1120. r2p0) erratum. The Store Buffer does not have any automatic draining
  1121. mechanism and therefore a livelock may occur if an external agent
  1122. continuously polls a memory location waiting to observe an update.
  1123. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1124. written polling loops from denying visibility of updates to memory.
  1125. config ARM_ERRATA_364296
  1126. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1127. depends on CPU_V6
  1128. help
  1129. This options enables the workaround for the 364296 ARM1136
  1130. r0p2 erratum (possible cache data corruption with
  1131. hit-under-miss enabled). It sets the undocumented bit 31 in
  1132. the auxiliary control register and the FI bit in the control
  1133. register, thus disabling hit-under-miss without putting the
  1134. processor into full low interrupt latency mode. ARM11MPCore
  1135. is not affected.
  1136. config ARM_ERRATA_764369
  1137. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1138. depends on CPU_V7 && SMP
  1139. help
  1140. This option enables the workaround for erratum 764369
  1141. affecting Cortex-A9 MPCore with two or more processors (all
  1142. current revisions). Under certain timing circumstances, a data
  1143. cache line maintenance operation by MVA targeting an Inner
  1144. Shareable memory region may fail to proceed up to either the
  1145. Point of Coherency or to the Point of Unification of the
  1146. system. This workaround adds a DSB instruction before the
  1147. relevant cache maintenance functions and sets a specific bit
  1148. in the diagnostic control register of the SCU.
  1149. config PL310_ERRATA_769419
  1150. bool "PL310 errata: no automatic Store Buffer drain"
  1151. depends on CACHE_L2X0
  1152. help
  1153. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1154. not automatically drain. This can cause normal, non-cacheable
  1155. writes to be retained when the memory system is idle, leading
  1156. to suboptimal I/O performance for drivers using coherent DMA.
  1157. This option adds a write barrier to the cpu_idle loop so that,
  1158. on systems with an outer cache, the store buffer is drained
  1159. explicitly.
  1160. config ARM_ERRATA_775420
  1161. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1162. depends on CPU_V7
  1163. help
  1164. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1165. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1166. operation aborts with MMU exception, it might cause the processor
  1167. to deadlock. This workaround puts DSB before executing ISB if
  1168. an abort may occur on cache maintenance.
  1169. config ARM_ERRATA_798181
  1170. bool "ARM errata: TLBI/DSB failure on Cortex-A15"
  1171. depends on CPU_V7 && SMP
  1172. help
  1173. On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
  1174. adequately shooting down all use of the old entries. This
  1175. option enables the Linux kernel workaround for this erratum
  1176. which sends an IPI to the CPUs that are running the same ASID
  1177. as the one being invalidated.
  1178. endmenu
  1179. source "arch/arm/common/Kconfig"
  1180. menu "Bus support"
  1181. config ARM_AMBA
  1182. bool
  1183. config ISA
  1184. bool
  1185. help
  1186. Find out whether you have ISA slots on your motherboard. ISA is the
  1187. name of a bus system, i.e. the way the CPU talks to the other stuff
  1188. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1189. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1190. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1191. # Select ISA DMA controller support
  1192. config ISA_DMA
  1193. bool
  1194. select ISA_DMA_API
  1195. # Select ISA DMA interface
  1196. config ISA_DMA_API
  1197. bool
  1198. config PCI
  1199. bool "PCI support" if MIGHT_HAVE_PCI
  1200. help
  1201. Find out whether you have a PCI motherboard. PCI is the name of a
  1202. bus system, i.e. the way the CPU talks to the other stuff inside
  1203. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1204. VESA. If you have PCI, say Y, otherwise N.
  1205. config PCI_DOMAINS
  1206. bool
  1207. depends on PCI
  1208. config PCI_NANOENGINE
  1209. bool "BSE nanoEngine PCI support"
  1210. depends on SA1100_NANOENGINE
  1211. help
  1212. Enable PCI on the BSE nanoEngine board.
  1213. config PCI_SYSCALL
  1214. def_bool PCI
  1215. # Select the host bridge type
  1216. config PCI_HOST_VIA82C505
  1217. bool
  1218. depends on PCI && ARCH_SHARK
  1219. default y
  1220. config PCI_HOST_ITE8152
  1221. bool
  1222. depends on PCI && MACH_ARMCORE
  1223. default y
  1224. select DMABOUNCE
  1225. source "drivers/pci/Kconfig"
  1226. source "drivers/pci/pcie/Kconfig"
  1227. source "drivers/pcmcia/Kconfig"
  1228. endmenu
  1229. menu "Kernel Features"
  1230. config HAVE_SMP
  1231. bool
  1232. help
  1233. This option should be selected by machines which have an SMP-
  1234. capable CPU.
  1235. The only effect of this option is to make the SMP-related
  1236. options available to the user for configuration.
  1237. config SMP
  1238. bool "Symmetric Multi-Processing"
  1239. depends on CPU_V6K || CPU_V7
  1240. depends on GENERIC_CLOCKEVENTS
  1241. depends on HAVE_SMP
  1242. depends on MMU || ARM_MPU
  1243. select USE_GENERIC_SMP_HELPERS
  1244. help
  1245. This enables support for systems with more than one CPU. If you have
  1246. a system with only one CPU, like most personal computers, say N. If
  1247. you have a system with more than one CPU, say Y.
  1248. If you say N here, the kernel will run on single and multiprocessor
  1249. machines, but will use only one CPU of a multiprocessor machine. If
  1250. you say Y here, the kernel will run on many, but not all, single
  1251. processor machines. On a single processor machine, the kernel will
  1252. run faster if you say N here.
  1253. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1254. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1255. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1256. If you don't know what to do here, say N.
  1257. config SMP_ON_UP
  1258. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1259. depends on SMP && !XIP_KERNEL && MMU
  1260. default y
  1261. help
  1262. SMP kernels contain instructions which fail on non-SMP processors.
  1263. Enabling this option allows the kernel to modify itself to make
  1264. these instructions safe. Disabling it allows about 1K of space
  1265. savings.
  1266. If you don't know what to do here, say Y.
  1267. config ARM_CPU_TOPOLOGY
  1268. bool "Support cpu topology definition"
  1269. depends on SMP && CPU_V7
  1270. default y
  1271. help
  1272. Support ARM cpu topology definition. The MPIDR register defines
  1273. affinity between processors which is then used to describe the cpu
  1274. topology of an ARM System.
  1275. config SCHED_MC
  1276. bool "Multi-core scheduler support"
  1277. depends on ARM_CPU_TOPOLOGY
  1278. help
  1279. Multi-core scheduler support improves the CPU scheduler's decision
  1280. making when dealing with multi-core CPU chips at a cost of slightly
  1281. increased overhead in some places. If unsure say N here.
  1282. config SCHED_SMT
  1283. bool "SMT scheduler support"
  1284. depends on ARM_CPU_TOPOLOGY
  1285. help
  1286. Improves the CPU scheduler's decision making when dealing with
  1287. MultiThreading at a cost of slightly increased overhead in some
  1288. places. If unsure say N here.
  1289. config HAVE_ARM_SCU
  1290. bool
  1291. help
  1292. This option enables support for the ARM system coherency unit
  1293. config HAVE_ARM_ARCH_TIMER
  1294. bool "Architected timer support"
  1295. depends on CPU_V7
  1296. select ARM_ARCH_TIMER
  1297. help
  1298. This option enables support for the ARM architected timer
  1299. config HAVE_ARM_TWD
  1300. bool
  1301. depends on SMP
  1302. select CLKSRC_OF if OF
  1303. help
  1304. This options enables support for the ARM timer and watchdog unit
  1305. config MCPM
  1306. bool "Multi-Cluster Power Management"
  1307. depends on CPU_V7 && SMP
  1308. help
  1309. This option provides the common power management infrastructure
  1310. for (multi-)cluster based systems, such as big.LITTLE based
  1311. systems.
  1312. choice
  1313. prompt "Memory split"
  1314. default VMSPLIT_3G
  1315. help
  1316. Select the desired split between kernel and user memory.
  1317. If you are not absolutely sure what you are doing, leave this
  1318. option alone!
  1319. config VMSPLIT_3G
  1320. bool "3G/1G user/kernel split"
  1321. config VMSPLIT_2G
  1322. bool "2G/2G user/kernel split"
  1323. config VMSPLIT_1G
  1324. bool "1G/3G user/kernel split"
  1325. endchoice
  1326. config PAGE_OFFSET
  1327. hex
  1328. default 0x40000000 if VMSPLIT_1G
  1329. default 0x80000000 if VMSPLIT_2G
  1330. default 0xC0000000
  1331. config NR_CPUS
  1332. int "Maximum number of CPUs (2-32)"
  1333. range 2 32
  1334. depends on SMP
  1335. default "4"
  1336. config HOTPLUG_CPU
  1337. bool "Support for hot-pluggable CPUs"
  1338. depends on SMP
  1339. help
  1340. Say Y here to experiment with turning CPUs off and on. CPUs
  1341. can be controlled through /sys/devices/system/cpu.
  1342. config ARM_PSCI
  1343. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1344. depends on CPU_V7
  1345. help
  1346. Say Y here if you want Linux to communicate with system firmware
  1347. implementing the PSCI specification for CPU-centric power
  1348. management operations described in ARM document number ARM DEN
  1349. 0022A ("Power State Coordination Interface System Software on
  1350. ARM processors").
  1351. config LOCAL_TIMERS
  1352. bool "Use local timer interrupts"
  1353. depends on SMP
  1354. default y
  1355. help
  1356. Enable support for local timers on SMP platforms, rather then the
  1357. legacy IPI broadcast method. Local timers allows the system
  1358. accounting to be spread across the timer interval, preventing a
  1359. "thundering herd" at every timer tick.
  1360. # The GPIO number here must be sorted by descending number. In case of
  1361. # a multiplatform kernel, we just want the highest value required by the
  1362. # selected platforms.
  1363. config ARCH_NR_GPIO
  1364. int
  1365. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1366. default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5
  1367. default 392 if ARCH_U8500
  1368. default 352 if ARCH_VT8500
  1369. default 288 if ARCH_SUNXI
  1370. default 264 if MACH_H4700
  1371. default 0
  1372. help
  1373. Maximum number of GPIOs in the system.
  1374. If unsure, leave the default value.
  1375. source kernel/Kconfig.preempt
  1376. config HZ
  1377. int
  1378. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1379. ARCH_S5PV210 || ARCH_EXYNOS4
  1380. default AT91_TIMER_HZ if ARCH_AT91
  1381. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1382. default 100
  1383. config SCHED_HRTICK
  1384. def_bool HIGH_RES_TIMERS
  1385. config THUMB2_KERNEL
  1386. bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
  1387. depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
  1388. default y if CPU_THUMBONLY
  1389. select AEABI
  1390. select ARM_ASM_UNIFIED
  1391. select ARM_UNWIND
  1392. help
  1393. By enabling this option, the kernel will be compiled in
  1394. Thumb-2 mode. A compiler/assembler that understand the unified
  1395. ARM-Thumb syntax is needed.
  1396. If unsure, say N.
  1397. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1398. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1399. depends on THUMB2_KERNEL && MODULES
  1400. default y
  1401. help
  1402. Various binutils versions can resolve Thumb-2 branches to
  1403. locally-defined, preemptible global symbols as short-range "b.n"
  1404. branch instructions.
  1405. This is a problem, because there's no guarantee the final
  1406. destination of the symbol, or any candidate locations for a
  1407. trampoline, are within range of the branch. For this reason, the
  1408. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1409. relocation in modules at all, and it makes little sense to add
  1410. support.
  1411. The symptom is that the kernel fails with an "unsupported
  1412. relocation" error when loading some modules.
  1413. Until fixed tools are available, passing
  1414. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1415. code which hits this problem, at the cost of a bit of extra runtime
  1416. stack usage in some cases.
  1417. The problem is described in more detail at:
  1418. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1419. Only Thumb-2 kernels are affected.
  1420. Unless you are sure your tools don't have this problem, say Y.
  1421. config ARM_ASM_UNIFIED
  1422. bool
  1423. config AEABI
  1424. bool "Use the ARM EABI to compile the kernel"
  1425. help
  1426. This option allows for the kernel to be compiled using the latest
  1427. ARM ABI (aka EABI). This is only useful if you are using a user
  1428. space environment that is also compiled with EABI.
  1429. Since there are major incompatibilities between the legacy ABI and
  1430. EABI, especially with regard to structure member alignment, this
  1431. option also changes the kernel syscall calling convention to
  1432. disambiguate both ABIs and allow for backward compatibility support
  1433. (selected with CONFIG_OABI_COMPAT).
  1434. To use this you need GCC version 4.0.0 or later.
  1435. config OABI_COMPAT
  1436. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1437. depends on AEABI && !THUMB2_KERNEL
  1438. default y
  1439. help
  1440. This option preserves the old syscall interface along with the
  1441. new (ARM EABI) one. It also provides a compatibility layer to
  1442. intercept syscalls that have structure arguments which layout
  1443. in memory differs between the legacy ABI and the new ARM EABI
  1444. (only for non "thumb" binaries). This option adds a tiny
  1445. overhead to all syscalls and produces a slightly larger kernel.
  1446. If you know you'll be using only pure EABI user space then you
  1447. can say N here. If this option is not selected and you attempt
  1448. to execute a legacy ABI binary then the result will be
  1449. UNPREDICTABLE (in fact it can be predicted that it won't work
  1450. at all). If in doubt say Y.
  1451. config ARCH_HAS_HOLES_MEMORYMODEL
  1452. bool
  1453. config ARCH_SPARSEMEM_ENABLE
  1454. bool
  1455. config ARCH_SPARSEMEM_DEFAULT
  1456. def_bool ARCH_SPARSEMEM_ENABLE
  1457. config ARCH_SELECT_MEMORY_MODEL
  1458. def_bool ARCH_SPARSEMEM_ENABLE
  1459. config HAVE_ARCH_PFN_VALID
  1460. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1461. config HIGHMEM
  1462. bool "High Memory Support"
  1463. depends on MMU
  1464. help
  1465. The address space of ARM processors is only 4 Gigabytes large
  1466. and it has to accommodate user address space, kernel address
  1467. space as well as some memory mapped IO. That means that, if you
  1468. have a large amount of physical memory and/or IO, not all of the
  1469. memory can be "permanently mapped" by the kernel. The physical
  1470. memory that is not permanently mapped is called "high memory".
  1471. Depending on the selected kernel/user memory split, minimum
  1472. vmalloc space and actual amount of RAM, you may not need this
  1473. option which should result in a slightly faster kernel.
  1474. If unsure, say n.
  1475. config HIGHPTE
  1476. bool "Allocate 2nd-level pagetables from highmem"
  1477. depends on HIGHMEM
  1478. config HW_PERF_EVENTS
  1479. bool "Enable hardware performance counter support for perf events"
  1480. depends on PERF_EVENTS
  1481. default y
  1482. help
  1483. Enable hardware performance counter support for perf events. If
  1484. disabled, perf events will use software events only.
  1485. config SYS_SUPPORTS_HUGETLBFS
  1486. def_bool y
  1487. depends on ARM_LPAE
  1488. config HAVE_ARCH_TRANSPARENT_HUGEPAGE
  1489. def_bool y
  1490. depends on ARM_LPAE
  1491. source "mm/Kconfig"
  1492. config FORCE_MAX_ZONEORDER
  1493. int "Maximum zone order" if ARCH_SHMOBILE
  1494. range 11 64 if ARCH_SHMOBILE
  1495. default "12" if SOC_AM33XX
  1496. default "9" if SA1111
  1497. default "11"
  1498. help
  1499. The kernel memory allocator divides physically contiguous memory
  1500. blocks into "zones", where each zone is a power of two number of
  1501. pages. This option selects the largest power of two that the kernel
  1502. keeps in the memory allocator. If you need to allocate very large
  1503. blocks of physically contiguous memory, then you may need to
  1504. increase this value.
  1505. This config option is actually maximum order plus one. For example,
  1506. a value of 11 means that the largest free memory block is 2^10 pages.
  1507. config ALIGNMENT_TRAP
  1508. bool
  1509. depends on CPU_CP15_MMU
  1510. default y if !ARCH_EBSA110
  1511. select HAVE_PROC_CPU if PROC_FS
  1512. help
  1513. ARM processors cannot fetch/store information which is not
  1514. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1515. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1516. fetch/store instructions will be emulated in software if you say
  1517. here, which has a severe performance impact. This is necessary for
  1518. correct operation of some network protocols. With an IP-only
  1519. configuration it is safe to say N, otherwise say Y.
  1520. config UACCESS_WITH_MEMCPY
  1521. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1522. depends on MMU
  1523. default y if CPU_FEROCEON
  1524. help
  1525. Implement faster copy_to_user and clear_user methods for CPU
  1526. cores where a 8-word STM instruction give significantly higher
  1527. memory write throughput than a sequence of individual 32bit stores.
  1528. A possible side effect is a slight increase in scheduling latency
  1529. between threads sharing the same address space if they invoke
  1530. such copy operations with large buffers.
  1531. However, if the CPU data cache is using a write-allocate mode,
  1532. this option is unlikely to provide any performance gain.
  1533. config SECCOMP
  1534. bool
  1535. prompt "Enable seccomp to safely compute untrusted bytecode"
  1536. ---help---
  1537. This kernel feature is useful for number crunching applications
  1538. that may need to compute untrusted bytecode during their
  1539. execution. By using pipes or other transports made available to
  1540. the process as file descriptors supporting the read/write
  1541. syscalls, it's possible to isolate those applications in
  1542. their own address space using seccomp. Once seccomp is
  1543. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1544. and the task is only allowed to execute a few safe syscalls
  1545. defined by each seccomp mode.
  1546. config CC_STACKPROTECTOR
  1547. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1548. help
  1549. This option turns on the -fstack-protector GCC feature. This
  1550. feature puts, at the beginning of functions, a canary value on
  1551. the stack just before the return address, and validates
  1552. the value just before actually returning. Stack based buffer
  1553. overflows (that need to overwrite this return address) now also
  1554. overwrite the canary, which gets detected and the attack is then
  1555. neutralized via a kernel panic.
  1556. This feature requires gcc version 4.2 or above.
  1557. config XEN_DOM0
  1558. def_bool y
  1559. depends on XEN
  1560. config XEN
  1561. bool "Xen guest support on ARM (EXPERIMENTAL)"
  1562. depends on ARM && AEABI && OF
  1563. depends on CPU_V7 && !CPU_V6
  1564. depends on !GENERIC_ATOMIC64
  1565. select ARM_PSCI
  1566. help
  1567. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1568. endmenu
  1569. menu "Boot options"
  1570. config USE_OF
  1571. bool "Flattened Device Tree support"
  1572. select IRQ_DOMAIN
  1573. select OF
  1574. select OF_EARLY_FLATTREE
  1575. help
  1576. Include support for flattened device tree machine descriptions.
  1577. config ATAGS
  1578. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1579. default y
  1580. help
  1581. This is the traditional way of passing data to the kernel at boot
  1582. time. If you are solely relying on the flattened device tree (or
  1583. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1584. to remove ATAGS support from your kernel binary. If unsure,
  1585. leave this to y.
  1586. config DEPRECATED_PARAM_STRUCT
  1587. bool "Provide old way to pass kernel parameters"
  1588. depends on ATAGS
  1589. help
  1590. This was deprecated in 2001 and announced to live on for 5 years.
  1591. Some old boot loaders still use this way.
  1592. # Compressed boot loader in ROM. Yes, we really want to ask about
  1593. # TEXT and BSS so we preserve their values in the config files.
  1594. config ZBOOT_ROM_TEXT
  1595. hex "Compressed ROM boot loader base address"
  1596. default "0"
  1597. help
  1598. The physical address at which the ROM-able zImage is to be
  1599. placed in the target. Platforms which normally make use of
  1600. ROM-able zImage formats normally set this to a suitable
  1601. value in their defconfig file.
  1602. If ZBOOT_ROM is not enabled, this has no effect.
  1603. config ZBOOT_ROM_BSS
  1604. hex "Compressed ROM boot loader BSS address"
  1605. default "0"
  1606. help
  1607. The base address of an area of read/write memory in the target
  1608. for the ROM-able zImage which must be available while the
  1609. decompressor is running. It must be large enough to hold the
  1610. entire decompressed kernel plus an additional 128 KiB.
  1611. Platforms which normally make use of ROM-able zImage formats
  1612. normally set this to a suitable value in their defconfig file.
  1613. If ZBOOT_ROM is not enabled, this has no effect.
  1614. config ZBOOT_ROM
  1615. bool "Compressed boot loader in ROM/flash"
  1616. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1617. help
  1618. Say Y here if you intend to execute your compressed kernel image
  1619. (zImage) directly from ROM or flash. If unsure, say N.
  1620. choice
  1621. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1622. depends on ZBOOT_ROM && ARCH_SH7372
  1623. default ZBOOT_ROM_NONE
  1624. help
  1625. Include experimental SD/MMC loading code in the ROM-able zImage.
  1626. With this enabled it is possible to write the ROM-able zImage
  1627. kernel image to an MMC or SD card and boot the kernel straight
  1628. from the reset vector. At reset the processor Mask ROM will load
  1629. the first part of the ROM-able zImage which in turn loads the
  1630. rest the kernel image to RAM.
  1631. config ZBOOT_ROM_NONE
  1632. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1633. help
  1634. Do not load image from SD or MMC
  1635. config ZBOOT_ROM_MMCIF
  1636. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1637. help
  1638. Load image from MMCIF hardware block.
  1639. config ZBOOT_ROM_SH_MOBILE_SDHI
  1640. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1641. help
  1642. Load image from SDHI hardware block
  1643. endchoice
  1644. config ARM_APPENDED_DTB
  1645. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1646. depends on OF && !ZBOOT_ROM
  1647. help
  1648. With this option, the boot code will look for a device tree binary
  1649. (DTB) appended to zImage
  1650. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1651. This is meant as a backward compatibility convenience for those
  1652. systems with a bootloader that can't be upgraded to accommodate
  1653. the documented boot protocol using a device tree.
  1654. Beware that there is very little in terms of protection against
  1655. this option being confused by leftover garbage in memory that might
  1656. look like a DTB header after a reboot if no actual DTB is appended
  1657. to zImage. Do not leave this option active in a production kernel
  1658. if you don't intend to always append a DTB. Proper passing of the
  1659. location into r2 of a bootloader provided DTB is always preferable
  1660. to this option.
  1661. config ARM_ATAG_DTB_COMPAT
  1662. bool "Supplement the appended DTB with traditional ATAG information"
  1663. depends on ARM_APPENDED_DTB
  1664. help
  1665. Some old bootloaders can't be updated to a DTB capable one, yet
  1666. they provide ATAGs with memory configuration, the ramdisk address,
  1667. the kernel cmdline string, etc. Such information is dynamically
  1668. provided by the bootloader and can't always be stored in a static
  1669. DTB. To allow a device tree enabled kernel to be used with such
  1670. bootloaders, this option allows zImage to extract the information
  1671. from the ATAG list and store it at run time into the appended DTB.
  1672. choice
  1673. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1674. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1675. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1676. bool "Use bootloader kernel arguments if available"
  1677. help
  1678. Uses the command-line options passed by the boot loader instead of
  1679. the device tree bootargs property. If the boot loader doesn't provide
  1680. any, the device tree bootargs property will be used.
  1681. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1682. bool "Extend with bootloader kernel arguments"
  1683. help
  1684. The command-line arguments provided by the boot loader will be
  1685. appended to the the device tree bootargs property.
  1686. endchoice
  1687. config CMDLINE
  1688. string "Default kernel command string"
  1689. default ""
  1690. help
  1691. On some architectures (EBSA110 and CATS), there is currently no way
  1692. for the boot loader to pass arguments to the kernel. For these
  1693. architectures, you should supply some command-line options at build
  1694. time by entering them here. As a minimum, you should specify the
  1695. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1696. choice
  1697. prompt "Kernel command line type" if CMDLINE != ""
  1698. default CMDLINE_FROM_BOOTLOADER
  1699. depends on ATAGS
  1700. config CMDLINE_FROM_BOOTLOADER
  1701. bool "Use bootloader kernel arguments if available"
  1702. help
  1703. Uses the command-line options passed by the boot loader. If
  1704. the boot loader doesn't provide any, the default kernel command
  1705. string provided in CMDLINE will be used.
  1706. config CMDLINE_EXTEND
  1707. bool "Extend bootloader kernel arguments"
  1708. help
  1709. The command-line arguments provided by the boot loader will be
  1710. appended to the default kernel command string.
  1711. config CMDLINE_FORCE
  1712. bool "Always use the default kernel command string"
  1713. help
  1714. Always use the default kernel command string, even if the boot
  1715. loader passes other arguments to the kernel.
  1716. This is useful if you cannot or don't want to change the
  1717. command-line options your boot loader passes to the kernel.
  1718. endchoice
  1719. config XIP_KERNEL
  1720. bool "Kernel Execute-In-Place from ROM"
  1721. depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
  1722. help
  1723. Execute-In-Place allows the kernel to run from non-volatile storage
  1724. directly addressable by the CPU, such as NOR flash. This saves RAM
  1725. space since the text section of the kernel is not loaded from flash
  1726. to RAM. Read-write sections, such as the data section and stack,
  1727. are still copied to RAM. The XIP kernel is not compressed since
  1728. it has to run directly from flash, so it will take more space to
  1729. store it. The flash address used to link the kernel object files,
  1730. and for storing it, is configuration dependent. Therefore, if you
  1731. say Y here, you must know the proper physical address where to
  1732. store the kernel image depending on your own flash memory usage.
  1733. Also note that the make target becomes "make xipImage" rather than
  1734. "make zImage" or "make Image". The final kernel binary to put in
  1735. ROM memory will be arch/arm/boot/xipImage.
  1736. If unsure, say N.
  1737. config XIP_PHYS_ADDR
  1738. hex "XIP Kernel Physical Location"
  1739. depends on XIP_KERNEL
  1740. default "0x00080000"
  1741. help
  1742. This is the physical address in your flash memory the kernel will
  1743. be linked for and stored to. This address is dependent on your
  1744. own flash usage.
  1745. config KEXEC
  1746. bool "Kexec system call (EXPERIMENTAL)"
  1747. depends on (!SMP || PM_SLEEP_SMP)
  1748. help
  1749. kexec is a system call that implements the ability to shutdown your
  1750. current kernel, and to start another kernel. It is like a reboot
  1751. but it is independent of the system firmware. And like a reboot
  1752. you can start any kernel with it, not just Linux.
  1753. It is an ongoing process to be certain the hardware in a machine
  1754. is properly shutdown, so do not be surprised if this code does not
  1755. initially work for you. It may help to enable device hotplugging
  1756. support.
  1757. config ATAGS_PROC
  1758. bool "Export atags in procfs"
  1759. depends on ATAGS && KEXEC
  1760. default y
  1761. help
  1762. Should the atags used to boot the kernel be exported in an "atags"
  1763. file in procfs. Useful with kexec.
  1764. config CRASH_DUMP
  1765. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1766. help
  1767. Generate crash dump after being started by kexec. This should
  1768. be normally only set in special crash dump kernels which are
  1769. loaded in the main kernel with kexec-tools into a specially
  1770. reserved region and then later executed after a crash by
  1771. kdump/kexec. The crash dump kernel must be compiled to a
  1772. memory address not used by the main kernel
  1773. For more details see Documentation/kdump/kdump.txt
  1774. config AUTO_ZRELADDR
  1775. bool "Auto calculation of the decompressed kernel image address"
  1776. depends on !ZBOOT_ROM
  1777. help
  1778. ZRELADDR is the physical address where the decompressed kernel
  1779. image will be placed. If AUTO_ZRELADDR is selected, the address
  1780. will be determined at run-time by masking the current IP with
  1781. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1782. from start of memory.
  1783. endmenu
  1784. menu "CPU Power Management"
  1785. if ARCH_HAS_CPUFREQ
  1786. source "drivers/cpufreq/Kconfig"
  1787. endif
  1788. source "drivers/cpuidle/Kconfig"
  1789. endmenu
  1790. menu "Floating point emulation"
  1791. comment "At least one emulation must be selected"
  1792. config FPE_NWFPE
  1793. bool "NWFPE math emulation"
  1794. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1795. ---help---
  1796. Say Y to include the NWFPE floating point emulator in the kernel.
  1797. This is necessary to run most binaries. Linux does not currently
  1798. support floating point hardware so you need to say Y here even if
  1799. your machine has an FPA or floating point co-processor podule.
  1800. You may say N here if you are going to load the Acorn FPEmulator
  1801. early in the bootup.
  1802. config FPE_NWFPE_XP
  1803. bool "Support extended precision"
  1804. depends on FPE_NWFPE
  1805. help
  1806. Say Y to include 80-bit support in the kernel floating-point
  1807. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1808. Note that gcc does not generate 80-bit operations by default,
  1809. so in most cases this option only enlarges the size of the
  1810. floating point emulator without any good reason.
  1811. You almost surely want to say N here.
  1812. config FPE_FASTFPE
  1813. bool "FastFPE math emulation (EXPERIMENTAL)"
  1814. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1815. ---help---
  1816. Say Y here to include the FAST floating point emulator in the kernel.
  1817. This is an experimental much faster emulator which now also has full
  1818. precision for the mantissa. It does not support any exceptions.
  1819. It is very simple, and approximately 3-6 times faster than NWFPE.
  1820. It should be sufficient for most programs. It may be not suitable
  1821. for scientific calculations, but you have to check this for yourself.
  1822. If you do not feel you need a faster FP emulation you should better
  1823. choose NWFPE.
  1824. config VFP
  1825. bool "VFP-format floating point maths"
  1826. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1827. help
  1828. Say Y to include VFP support code in the kernel. This is needed
  1829. if your hardware includes a VFP unit.
  1830. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1831. release notes and additional status information.
  1832. Say N if your target does not have VFP hardware.
  1833. config VFPv3
  1834. bool
  1835. depends on VFP
  1836. default y if CPU_V7
  1837. config NEON
  1838. bool "Advanced SIMD (NEON) Extension support"
  1839. depends on VFPv3 && CPU_V7
  1840. help
  1841. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1842. Extension.
  1843. endmenu
  1844. menu "Userspace binary formats"
  1845. source "fs/Kconfig.binfmt"
  1846. config ARTHUR
  1847. tristate "RISC OS personality"
  1848. depends on !AEABI
  1849. help
  1850. Say Y here to include the kernel code necessary if you want to run
  1851. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1852. experimental; if this sounds frightening, say N and sleep in peace.
  1853. You can also say M here to compile this support as a module (which
  1854. will be called arthur).
  1855. endmenu
  1856. menu "Power management options"
  1857. source "kernel/power/Kconfig"
  1858. config ARCH_SUSPEND_POSSIBLE
  1859. depends on !ARCH_S5PC100
  1860. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1861. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1862. def_bool y
  1863. config ARM_CPU_SUSPEND
  1864. def_bool PM_SLEEP
  1865. endmenu
  1866. source "net/Kconfig"
  1867. source "drivers/Kconfig"
  1868. source "fs/Kconfig"
  1869. source "arch/arm/Kconfig.debug"
  1870. source "security/Kconfig"
  1871. source "crypto/Kconfig"
  1872. source "lib/Kconfig"
  1873. source "arch/arm/kvm/Kconfig"