Kconfig 65 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_WANT_IPC_PARSE_VERSION
  9. select BUILDTIME_EXTABLE_SORT if MMU
  10. select CLONE_BACKWARDS
  11. select CPU_PM if (SUSPEND || CPU_IDLE)
  12. select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
  13. select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
  14. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  15. select GENERIC_IDLE_POLL_SETUP
  16. select GENERIC_IRQ_PROBE
  17. select GENERIC_IRQ_SHOW
  18. select GENERIC_PCI_IOMAP
  19. select GENERIC_SCHED_CLOCK
  20. select GENERIC_SMP_IDLE_THREAD
  21. select GENERIC_STRNCPY_FROM_USER
  22. select GENERIC_STRNLEN_USER
  23. select HARDIRQS_SW_RESEND
  24. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  25. select HAVE_ARCH_KGDB
  26. select HAVE_ARCH_SECCOMP_FILTER
  27. select HAVE_ARCH_TRACEHOOK
  28. select HAVE_BPF_JIT
  29. select HAVE_CONTEXT_TRACKING
  30. select HAVE_C_RECORDMCOUNT
  31. select HAVE_DEBUG_KMEMLEAK
  32. select HAVE_DMA_API_DEBUG
  33. select HAVE_DMA_ATTRS
  34. select HAVE_DMA_CONTIGUOUS if MMU
  35. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  36. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  37. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  38. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  39. select HAVE_GENERIC_DMA_COHERENT
  40. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  41. select HAVE_IDE if PCI || ISA || PCMCIA
  42. select HAVE_IRQ_TIME_ACCOUNTING
  43. select HAVE_KERNEL_GZIP
  44. select HAVE_KERNEL_LZ4
  45. select HAVE_KERNEL_LZMA
  46. select HAVE_KERNEL_LZO
  47. select HAVE_KERNEL_XZ
  48. select HAVE_KPROBES if !XIP_KERNEL
  49. select HAVE_KRETPROBES if (HAVE_KPROBES)
  50. select HAVE_MEMBLOCK
  51. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  52. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  53. select HAVE_PERF_EVENTS
  54. select HAVE_REGS_AND_STACK_ACCESS_API
  55. select HAVE_SYSCALL_TRACEPOINTS
  56. select HAVE_UID16
  57. select HAVE_VIRT_CPU_ACCOUNTING_GEN
  58. select IRQ_FORCED_THREADING
  59. select KTIME_SCALAR
  60. select MODULES_USE_ELF_REL
  61. select OLD_SIGACTION
  62. select OLD_SIGSUSPEND3
  63. select PERF_USE_VMALLOC
  64. select RTC_LIB
  65. select SYS_SUPPORTS_APM_EMULATION
  66. # Above selects are sorted alphabetically; please add new ones
  67. # according to that. Thanks.
  68. help
  69. The ARM series is a line of low-power-consumption RISC chip designs
  70. licensed by ARM Ltd and targeted at embedded applications and
  71. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  72. manufactured, but legacy ARM-based PC hardware remains popular in
  73. Europe. There is an ARM Linux project with a web page at
  74. <http://www.arm.linux.org.uk/>.
  75. config ARM_HAS_SG_CHAIN
  76. bool
  77. config NEED_SG_DMA_LENGTH
  78. bool
  79. config ARM_DMA_USE_IOMMU
  80. bool
  81. select ARM_HAS_SG_CHAIN
  82. select NEED_SG_DMA_LENGTH
  83. if ARM_DMA_USE_IOMMU
  84. config ARM_DMA_IOMMU_ALIGNMENT
  85. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  86. range 4 9
  87. default 8
  88. help
  89. DMA mapping framework by default aligns all buffers to the smallest
  90. PAGE_SIZE order which is greater than or equal to the requested buffer
  91. size. This works well for buffers up to a few hundreds kilobytes, but
  92. for larger buffers it just a waste of address space. Drivers which has
  93. relatively small addressing window (like 64Mib) might run out of
  94. virtual space with just a few allocations.
  95. With this parameter you can specify the maximum PAGE_SIZE order for
  96. DMA IOMMU buffers. Larger buffers will be aligned only to this
  97. specified order. The order is expressed as a power of two multiplied
  98. by the PAGE_SIZE.
  99. endif
  100. config HAVE_PWM
  101. bool
  102. config MIGHT_HAVE_PCI
  103. bool
  104. config SYS_SUPPORTS_APM_EMULATION
  105. bool
  106. config HAVE_TCM
  107. bool
  108. select GENERIC_ALLOCATOR
  109. config HAVE_PROC_CPU
  110. bool
  111. config NO_IOPORT
  112. bool
  113. config EISA
  114. bool
  115. ---help---
  116. The Extended Industry Standard Architecture (EISA) bus was
  117. developed as an open alternative to the IBM MicroChannel bus.
  118. The EISA bus provided some of the features of the IBM MicroChannel
  119. bus while maintaining backward compatibility with cards made for
  120. the older ISA bus. The EISA bus saw limited use between 1988 and
  121. 1995 when it was made obsolete by the PCI bus.
  122. Say Y here if you are building a kernel for an EISA-based machine.
  123. Otherwise, say N.
  124. config SBUS
  125. bool
  126. config STACKTRACE_SUPPORT
  127. bool
  128. default y
  129. config HAVE_LATENCYTOP_SUPPORT
  130. bool
  131. depends on !SMP
  132. default y
  133. config LOCKDEP_SUPPORT
  134. bool
  135. default y
  136. config TRACE_IRQFLAGS_SUPPORT
  137. bool
  138. default y
  139. config RWSEM_GENERIC_SPINLOCK
  140. bool
  141. default y
  142. config RWSEM_XCHGADD_ALGORITHM
  143. bool
  144. config ARCH_HAS_ILOG2_U32
  145. bool
  146. config ARCH_HAS_ILOG2_U64
  147. bool
  148. config ARCH_HAS_CPUFREQ
  149. bool
  150. help
  151. Internal node to signify that the ARCH has CPUFREQ support
  152. and that the relevant menu configurations are displayed for
  153. it.
  154. config ARCH_HAS_BANDGAP
  155. bool
  156. config GENERIC_HWEIGHT
  157. bool
  158. default y
  159. config GENERIC_CALIBRATE_DELAY
  160. bool
  161. default y
  162. config ARCH_MAY_HAVE_PC_FDC
  163. bool
  164. config ZONE_DMA
  165. bool
  166. config NEED_DMA_MAP_STATE
  167. def_bool y
  168. config ARCH_HAS_DMA_SET_COHERENT_MASK
  169. bool
  170. config GENERIC_ISA_DMA
  171. bool
  172. config FIQ
  173. bool
  174. config NEED_RET_TO_USER
  175. bool
  176. config ARCH_MTD_XIP
  177. bool
  178. config VECTORS_BASE
  179. hex
  180. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  181. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  182. default 0x00000000
  183. help
  184. The base address of exception vectors. This must be two pages
  185. in size.
  186. config ARM_PATCH_PHYS_VIRT
  187. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  188. default y
  189. depends on !XIP_KERNEL && MMU
  190. depends on !ARCH_REALVIEW || !SPARSEMEM
  191. help
  192. Patch phys-to-virt and virt-to-phys translation functions at
  193. boot and module load time according to the position of the
  194. kernel in system memory.
  195. This can only be used with non-XIP MMU kernels where the base
  196. of physical memory is at a 16MB boundary.
  197. Only disable this option if you know that you do not require
  198. this feature (eg, building a kernel for a single machine) and
  199. you need to shrink the kernel to the minimal size.
  200. config NEED_MACH_GPIO_H
  201. bool
  202. help
  203. Select this when mach/gpio.h is required to provide special
  204. definitions for this platform. The need for mach/gpio.h should
  205. be avoided when possible.
  206. config NEED_MACH_IO_H
  207. bool
  208. help
  209. Select this when mach/io.h is required to provide special
  210. definitions for this platform. The need for mach/io.h should
  211. be avoided when possible.
  212. config NEED_MACH_MEMORY_H
  213. bool
  214. help
  215. Select this when mach/memory.h is required to provide special
  216. definitions for this platform. The need for mach/memory.h should
  217. be avoided when possible.
  218. config PHYS_OFFSET
  219. hex "Physical address of main memory" if MMU
  220. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  221. default DRAM_BASE if !MMU
  222. help
  223. Please provide the physical address corresponding to the
  224. location of main memory in your system.
  225. config GENERIC_BUG
  226. def_bool y
  227. depends on BUG
  228. source "init/Kconfig"
  229. source "kernel/Kconfig.freezer"
  230. menu "System Type"
  231. config MMU
  232. bool "MMU-based Paged Memory Management Support"
  233. default y
  234. help
  235. Select if you want MMU-based virtualised addressing space
  236. support by paged memory management. If unsure, say 'Y'.
  237. #
  238. # The "ARM system type" choice list is ordered alphabetically by option
  239. # text. Please add new entries in the option alphabetic order.
  240. #
  241. choice
  242. prompt "ARM system type"
  243. default ARCH_VERSATILE if !MMU
  244. default ARCH_MULTIPLATFORM if MMU
  245. config ARCH_MULTIPLATFORM
  246. bool "Allow multiple platforms to be selected"
  247. depends on MMU
  248. select ARM_PATCH_PHYS_VIRT
  249. select AUTO_ZRELADDR
  250. select COMMON_CLK
  251. select MULTI_IRQ_HANDLER
  252. select SPARSE_IRQ
  253. select USE_OF
  254. config ARCH_INTEGRATOR
  255. bool "ARM Ltd. Integrator family"
  256. select ARCH_HAS_CPUFREQ
  257. select ARM_AMBA
  258. select COMMON_CLK
  259. select COMMON_CLK_VERSATILE
  260. select GENERIC_CLOCKEVENTS
  261. select HAVE_TCM
  262. select ICST
  263. select MULTI_IRQ_HANDLER
  264. select NEED_MACH_MEMORY_H
  265. select PLAT_VERSATILE
  266. select SPARSE_IRQ
  267. select USE_OF
  268. select VERSATILE_FPGA_IRQ
  269. help
  270. Support for ARM's Integrator platform.
  271. config ARCH_REALVIEW
  272. bool "ARM Ltd. RealView family"
  273. select ARCH_WANT_OPTIONAL_GPIOLIB
  274. select ARM_AMBA
  275. select ARM_TIMER_SP804
  276. select COMMON_CLK
  277. select COMMON_CLK_VERSATILE
  278. select GENERIC_CLOCKEVENTS
  279. select GPIO_PL061 if GPIOLIB
  280. select ICST
  281. select NEED_MACH_MEMORY_H
  282. select PLAT_VERSATILE
  283. select PLAT_VERSATILE_CLCD
  284. help
  285. This enables support for ARM Ltd RealView boards.
  286. config ARCH_VERSATILE
  287. bool "ARM Ltd. Versatile family"
  288. select ARCH_WANT_OPTIONAL_GPIOLIB
  289. select ARM_AMBA
  290. select ARM_TIMER_SP804
  291. select ARM_VIC
  292. select CLKDEV_LOOKUP
  293. select GENERIC_CLOCKEVENTS
  294. select HAVE_MACH_CLKDEV
  295. select ICST
  296. select PLAT_VERSATILE
  297. select PLAT_VERSATILE_CLCD
  298. select PLAT_VERSATILE_CLOCK
  299. select VERSATILE_FPGA_IRQ
  300. help
  301. This enables support for ARM Ltd Versatile board.
  302. config ARCH_AT91
  303. bool "Atmel AT91"
  304. select ARCH_REQUIRE_GPIOLIB
  305. select CLKDEV_LOOKUP
  306. select IRQ_DOMAIN
  307. select NEED_MACH_GPIO_H
  308. select NEED_MACH_IO_H if PCCARD
  309. select PINCTRL
  310. select PINCTRL_AT91 if USE_OF
  311. help
  312. This enables support for systems based on Atmel
  313. AT91RM9200 and AT91SAM9* processors.
  314. config ARCH_CLPS711X
  315. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  316. select ARCH_REQUIRE_GPIOLIB
  317. select AUTO_ZRELADDR
  318. select CLKSRC_MMIO
  319. select COMMON_CLK
  320. select CPU_ARM720T
  321. select GENERIC_CLOCKEVENTS
  322. select MFD_SYSCON
  323. select MULTI_IRQ_HANDLER
  324. select SPARSE_IRQ
  325. help
  326. Support for Cirrus Logic 711x/721x/731x based boards.
  327. config ARCH_GEMINI
  328. bool "Cortina Systems Gemini"
  329. select ARCH_REQUIRE_GPIOLIB
  330. select CLKSRC_MMIO
  331. select CPU_FA526
  332. select GENERIC_CLOCKEVENTS
  333. help
  334. Support for the Cortina Systems Gemini family SoCs
  335. config ARCH_EBSA110
  336. bool "EBSA-110"
  337. select ARCH_USES_GETTIMEOFFSET
  338. select CPU_SA110
  339. select ISA
  340. select NEED_MACH_IO_H
  341. select NEED_MACH_MEMORY_H
  342. select NO_IOPORT
  343. help
  344. This is an evaluation board for the StrongARM processor available
  345. from Digital. It has limited hardware on-board, including an
  346. Ethernet interface, two PCMCIA sockets, two serial ports and a
  347. parallel port.
  348. config ARCH_EP93XX
  349. bool "EP93xx-based"
  350. select ARCH_HAS_HOLES_MEMORYMODEL
  351. select ARCH_REQUIRE_GPIOLIB
  352. select ARCH_USES_GETTIMEOFFSET
  353. select ARM_AMBA
  354. select ARM_VIC
  355. select CLKDEV_LOOKUP
  356. select CPU_ARM920T
  357. select NEED_MACH_MEMORY_H
  358. help
  359. This enables support for the Cirrus EP93xx series of CPUs.
  360. config ARCH_FOOTBRIDGE
  361. bool "FootBridge"
  362. select CPU_SA110
  363. select FOOTBRIDGE
  364. select GENERIC_CLOCKEVENTS
  365. select HAVE_IDE
  366. select NEED_MACH_IO_H if !MMU
  367. select NEED_MACH_MEMORY_H
  368. help
  369. Support for systems based on the DC21285 companion chip
  370. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  371. config ARCH_NETX
  372. bool "Hilscher NetX based"
  373. select ARM_VIC
  374. select CLKSRC_MMIO
  375. select CPU_ARM926T
  376. select GENERIC_CLOCKEVENTS
  377. help
  378. This enables support for systems based on the Hilscher NetX Soc
  379. config ARCH_IOP13XX
  380. bool "IOP13xx-based"
  381. depends on MMU
  382. select CPU_XSC3
  383. select NEED_MACH_MEMORY_H
  384. select NEED_RET_TO_USER
  385. select PCI
  386. select PLAT_IOP
  387. select VMSPLIT_1G
  388. help
  389. Support for Intel's IOP13XX (XScale) family of processors.
  390. config ARCH_IOP32X
  391. bool "IOP32x-based"
  392. depends on MMU
  393. select ARCH_REQUIRE_GPIOLIB
  394. select CPU_XSCALE
  395. select GPIO_IOP
  396. select NEED_RET_TO_USER
  397. select PCI
  398. select PLAT_IOP
  399. help
  400. Support for Intel's 80219 and IOP32X (XScale) family of
  401. processors.
  402. config ARCH_IOP33X
  403. bool "IOP33x-based"
  404. depends on MMU
  405. select ARCH_REQUIRE_GPIOLIB
  406. select CPU_XSCALE
  407. select GPIO_IOP
  408. select NEED_RET_TO_USER
  409. select PCI
  410. select PLAT_IOP
  411. help
  412. Support for Intel's IOP33X (XScale) family of processors.
  413. config ARCH_IXP4XX
  414. bool "IXP4xx-based"
  415. depends on MMU
  416. select ARCH_HAS_DMA_SET_COHERENT_MASK
  417. select ARCH_REQUIRE_GPIOLIB
  418. select CLKSRC_MMIO
  419. select CPU_XSCALE
  420. select DMABOUNCE if PCI
  421. select GENERIC_CLOCKEVENTS
  422. select MIGHT_HAVE_PCI
  423. select NEED_MACH_IO_H
  424. select USB_EHCI_BIG_ENDIAN_DESC
  425. select USB_EHCI_BIG_ENDIAN_MMIO
  426. help
  427. Support for Intel's IXP4XX (XScale) family of processors.
  428. config ARCH_DOVE
  429. bool "Marvell Dove"
  430. select ARCH_REQUIRE_GPIOLIB
  431. select CPU_PJ4
  432. select GENERIC_CLOCKEVENTS
  433. select MIGHT_HAVE_PCI
  434. select MVEBU_MBUS
  435. select PINCTRL
  436. select PINCTRL_DOVE
  437. select PLAT_ORION_LEGACY
  438. select USB_ARCH_HAS_EHCI
  439. help
  440. Support for the Marvell Dove SoC 88AP510
  441. config ARCH_KIRKWOOD
  442. bool "Marvell Kirkwood"
  443. select ARCH_HAS_CPUFREQ
  444. select ARCH_REQUIRE_GPIOLIB
  445. select CPU_FEROCEON
  446. select GENERIC_CLOCKEVENTS
  447. select MVEBU_MBUS
  448. select PCI
  449. select PCI_QUIRKS
  450. select PINCTRL
  451. select PINCTRL_KIRKWOOD
  452. select PLAT_ORION_LEGACY
  453. help
  454. Support for the following Marvell Kirkwood series SoCs:
  455. 88F6180, 88F6192 and 88F6281.
  456. config ARCH_MV78XX0
  457. bool "Marvell MV78xx0"
  458. select ARCH_REQUIRE_GPIOLIB
  459. select CPU_FEROCEON
  460. select GENERIC_CLOCKEVENTS
  461. select MVEBU_MBUS
  462. select PCI
  463. select PLAT_ORION_LEGACY
  464. help
  465. Support for the following Marvell MV78xx0 series SoCs:
  466. MV781x0, MV782x0.
  467. config ARCH_ORION5X
  468. bool "Marvell Orion"
  469. depends on MMU
  470. select ARCH_REQUIRE_GPIOLIB
  471. select CPU_FEROCEON
  472. select GENERIC_CLOCKEVENTS
  473. select MVEBU_MBUS
  474. select PCI
  475. select PLAT_ORION_LEGACY
  476. help
  477. Support for the following Marvell Orion 5x series SoCs:
  478. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  479. Orion-2 (5281), Orion-1-90 (6183).
  480. config ARCH_MMP
  481. bool "Marvell PXA168/910/MMP2"
  482. depends on MMU
  483. select ARCH_REQUIRE_GPIOLIB
  484. select CLKDEV_LOOKUP
  485. select GENERIC_ALLOCATOR
  486. select GENERIC_CLOCKEVENTS
  487. select GPIO_PXA
  488. select IRQ_DOMAIN
  489. select MULTI_IRQ_HANDLER
  490. select PINCTRL
  491. select PLAT_PXA
  492. select SPARSE_IRQ
  493. help
  494. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  495. config ARCH_KS8695
  496. bool "Micrel/Kendin KS8695"
  497. select ARCH_REQUIRE_GPIOLIB
  498. select CLKSRC_MMIO
  499. select CPU_ARM922T
  500. select GENERIC_CLOCKEVENTS
  501. select NEED_MACH_MEMORY_H
  502. help
  503. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  504. System-on-Chip devices.
  505. config ARCH_W90X900
  506. bool "Nuvoton W90X900 CPU"
  507. select ARCH_REQUIRE_GPIOLIB
  508. select CLKDEV_LOOKUP
  509. select CLKSRC_MMIO
  510. select CPU_ARM926T
  511. select GENERIC_CLOCKEVENTS
  512. help
  513. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  514. At present, the w90x900 has been renamed nuc900, regarding
  515. the ARM series product line, you can login the following
  516. link address to know more.
  517. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  518. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  519. config ARCH_LPC32XX
  520. bool "NXP LPC32XX"
  521. select ARCH_REQUIRE_GPIOLIB
  522. select ARM_AMBA
  523. select CLKDEV_LOOKUP
  524. select CLKSRC_MMIO
  525. select CPU_ARM926T
  526. select GENERIC_CLOCKEVENTS
  527. select HAVE_IDE
  528. select HAVE_PWM
  529. select USB_ARCH_HAS_OHCI
  530. select USE_OF
  531. help
  532. Support for the NXP LPC32XX family of processors
  533. config ARCH_PXA
  534. bool "PXA2xx/PXA3xx-based"
  535. depends on MMU
  536. select ARCH_HAS_CPUFREQ
  537. select ARCH_MTD_XIP
  538. select ARCH_REQUIRE_GPIOLIB
  539. select ARM_CPU_SUSPEND if PM
  540. select AUTO_ZRELADDR
  541. select CLKDEV_LOOKUP
  542. select CLKSRC_MMIO
  543. select GENERIC_CLOCKEVENTS
  544. select GPIO_PXA
  545. select HAVE_IDE
  546. select MULTI_IRQ_HANDLER
  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 CLKSRC_OF if OF
  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 SMP
  570. select HAVE_MACH_CLKDEV
  571. select HAVE_SMP
  572. select MIGHT_HAVE_CACHE_L2X0
  573. select MULTI_IRQ_HANDLER
  574. select NO_IOPORT
  575. select PINCTRL
  576. select PM_GENERIC_DOMAINS if PM
  577. select SPARSE_IRQ
  578. help
  579. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  580. config ARCH_RPC
  581. bool "RiscPC"
  582. select ARCH_ACORN
  583. select ARCH_MAY_HAVE_PC_FDC
  584. select ARCH_SPARSEMEM_ENABLE
  585. select ARCH_USES_GETTIMEOFFSET
  586. select FIQ
  587. select HAVE_IDE
  588. select HAVE_PATA_PLATFORM
  589. select ISA_DMA_API
  590. select NEED_MACH_IO_H
  591. select NEED_MACH_MEMORY_H
  592. select NO_IOPORT
  593. select VIRT_TO_BUS
  594. help
  595. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  596. CD-ROM interface, serial and parallel port, and the floppy drive.
  597. config ARCH_SA1100
  598. bool "SA1100-based"
  599. select ARCH_HAS_CPUFREQ
  600. select ARCH_MTD_XIP
  601. select ARCH_REQUIRE_GPIOLIB
  602. select ARCH_SPARSEMEM_ENABLE
  603. select CLKDEV_LOOKUP
  604. select CLKSRC_MMIO
  605. select CPU_FREQ
  606. select CPU_SA1100
  607. select GENERIC_CLOCKEVENTS
  608. select HAVE_IDE
  609. select ISA
  610. select NEED_MACH_GPIO_H
  611. select NEED_MACH_MEMORY_H
  612. select SPARSE_IRQ
  613. help
  614. Support for StrongARM 11x0 based boards.
  615. config ARCH_S3C24XX
  616. bool "Samsung S3C24XX SoCs"
  617. select ARCH_HAS_CPUFREQ
  618. select ARCH_REQUIRE_GPIOLIB
  619. select CLKDEV_LOOKUP
  620. select CLKSRC_SAMSUNG_PWM
  621. select GENERIC_CLOCKEVENTS
  622. select GPIO_SAMSUNG
  623. select HAVE_S3C2410_I2C if I2C
  624. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  625. select HAVE_S3C_RTC if RTC_CLASS
  626. select MULTI_IRQ_HANDLER
  627. select NEED_MACH_GPIO_H
  628. select NEED_MACH_IO_H
  629. select SAMSUNG_ATAGS
  630. help
  631. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  632. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  633. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  634. Samsung SMDK2410 development board (and derivatives).
  635. config ARCH_S3C64XX
  636. bool "Samsung S3C64XX"
  637. select ARCH_HAS_CPUFREQ
  638. select ARCH_REQUIRE_GPIOLIB
  639. select ARM_VIC
  640. select CLKDEV_LOOKUP
  641. select CLKSRC_SAMSUNG_PWM
  642. select COMMON_CLK
  643. select CPU_V6
  644. select GENERIC_CLOCKEVENTS
  645. select GPIO_SAMSUNG
  646. select HAVE_S3C2410_I2C if I2C
  647. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  648. select HAVE_TCM
  649. select NEED_MACH_GPIO_H
  650. select NO_IOPORT
  651. select PLAT_SAMSUNG
  652. select PM_GENERIC_DOMAINS
  653. select S3C_DEV_NAND
  654. select S3C_GPIO_TRACK
  655. select SAMSUNG_ATAGS
  656. select SAMSUNG_GPIOLIB_4BIT
  657. select SAMSUNG_WAKEMASK
  658. select SAMSUNG_WDT_RESET
  659. select USB_ARCH_HAS_OHCI
  660. help
  661. Samsung S3C64XX series based systems
  662. config ARCH_S5P64X0
  663. bool "Samsung S5P6440 S5P6450"
  664. select CLKDEV_LOOKUP
  665. select CLKSRC_SAMSUNG_PWM
  666. select CPU_V6
  667. select GENERIC_CLOCKEVENTS
  668. select GPIO_SAMSUNG
  669. select HAVE_S3C2410_I2C if I2C
  670. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  671. select HAVE_S3C_RTC if RTC_CLASS
  672. select NEED_MACH_GPIO_H
  673. select SAMSUNG_ATAGS
  674. select SAMSUNG_WDT_RESET
  675. help
  676. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  677. SMDK6450.
  678. config ARCH_S5PC100
  679. bool "Samsung S5PC100"
  680. select ARCH_REQUIRE_GPIOLIB
  681. select CLKDEV_LOOKUP
  682. select CLKSRC_SAMSUNG_PWM
  683. select CPU_V7
  684. select GENERIC_CLOCKEVENTS
  685. select GPIO_SAMSUNG
  686. select HAVE_S3C2410_I2C if I2C
  687. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  688. select HAVE_S3C_RTC if RTC_CLASS
  689. select NEED_MACH_GPIO_H
  690. select SAMSUNG_ATAGS
  691. select SAMSUNG_WDT_RESET
  692. help
  693. Samsung S5PC100 series based systems
  694. config ARCH_S5PV210
  695. bool "Samsung S5PV210/S5PC110"
  696. select ARCH_HAS_CPUFREQ
  697. select ARCH_HAS_HOLES_MEMORYMODEL
  698. select ARCH_SPARSEMEM_ENABLE
  699. select CLKDEV_LOOKUP
  700. select CLKSRC_SAMSUNG_PWM
  701. select CPU_V7
  702. select GENERIC_CLOCKEVENTS
  703. select GPIO_SAMSUNG
  704. select HAVE_S3C2410_I2C if I2C
  705. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  706. select HAVE_S3C_RTC if RTC_CLASS
  707. select NEED_MACH_GPIO_H
  708. select NEED_MACH_MEMORY_H
  709. select SAMSUNG_ATAGS
  710. help
  711. Samsung S5PV210/S5PC110 series based systems
  712. config ARCH_EXYNOS
  713. bool "Samsung EXYNOS"
  714. select ARCH_HAS_CPUFREQ
  715. select ARCH_HAS_HOLES_MEMORYMODEL
  716. select ARCH_REQUIRE_GPIOLIB
  717. select ARCH_SPARSEMEM_ENABLE
  718. select ARM_GIC
  719. select COMMON_CLK
  720. select CPU_V7
  721. select GENERIC_CLOCKEVENTS
  722. select HAVE_S3C2410_I2C if I2C
  723. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  724. select HAVE_S3C_RTC if RTC_CLASS
  725. select NEED_MACH_MEMORY_H
  726. select SPARSE_IRQ
  727. select USE_OF
  728. help
  729. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  730. config ARCH_DAVINCI
  731. bool "TI DaVinci"
  732. select ARCH_HAS_HOLES_MEMORYMODEL
  733. select ARCH_REQUIRE_GPIOLIB
  734. select CLKDEV_LOOKUP
  735. select GENERIC_ALLOCATOR
  736. select GENERIC_CLOCKEVENTS
  737. select GENERIC_IRQ_CHIP
  738. select HAVE_IDE
  739. select TI_PRIV_EDMA
  740. select USE_OF
  741. select ZONE_DMA
  742. help
  743. Support for TI's DaVinci platform.
  744. config ARCH_OMAP1
  745. bool "TI OMAP1"
  746. depends on MMU
  747. select ARCH_HAS_CPUFREQ
  748. select ARCH_HAS_HOLES_MEMORYMODEL
  749. select ARCH_OMAP
  750. select ARCH_REQUIRE_GPIOLIB
  751. select CLKDEV_LOOKUP
  752. select CLKSRC_MMIO
  753. select GENERIC_CLOCKEVENTS
  754. select GENERIC_IRQ_CHIP
  755. select HAVE_IDE
  756. select IRQ_DOMAIN
  757. select NEED_MACH_IO_H if PCCARD
  758. select NEED_MACH_MEMORY_H
  759. help
  760. Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
  761. endchoice
  762. menu "Multiple platform selection"
  763. depends on ARCH_MULTIPLATFORM
  764. comment "CPU Core family selection"
  765. config ARCH_MULTI_V4T
  766. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  767. depends on !ARCH_MULTI_V6_V7
  768. select ARCH_MULTI_V4_V5
  769. select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
  770. CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
  771. CPU_ARM925T || CPU_ARM940T)
  772. config ARCH_MULTI_V5
  773. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  774. depends on !ARCH_MULTI_V6_V7
  775. select ARCH_MULTI_V4_V5
  776. select CPU_ARM926T if (!CPU_ARM946E || CPU_ARM1020 || \
  777. CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
  778. CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
  779. config ARCH_MULTI_V4_V5
  780. bool
  781. config ARCH_MULTI_V6
  782. bool "ARMv6 based platforms (ARM11)"
  783. select ARCH_MULTI_V6_V7
  784. select CPU_V6
  785. config ARCH_MULTI_V7
  786. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  787. default y
  788. select ARCH_MULTI_V6_V7
  789. select CPU_V7
  790. config ARCH_MULTI_V6_V7
  791. bool
  792. config ARCH_MULTI_CPU_AUTO
  793. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  794. select ARCH_MULTI_V5
  795. endmenu
  796. #
  797. # This is sorted alphabetically by mach-* pathname. However, plat-*
  798. # Kconfigs may be included either alphabetically (according to the
  799. # plat- suffix) or along side the corresponding mach-* source.
  800. #
  801. source "arch/arm/mach-mvebu/Kconfig"
  802. source "arch/arm/mach-at91/Kconfig"
  803. source "arch/arm/mach-bcm/Kconfig"
  804. source "arch/arm/mach-bcm2835/Kconfig"
  805. source "arch/arm/mach-clps711x/Kconfig"
  806. source "arch/arm/mach-cns3xxx/Kconfig"
  807. source "arch/arm/mach-davinci/Kconfig"
  808. source "arch/arm/mach-dove/Kconfig"
  809. source "arch/arm/mach-ep93xx/Kconfig"
  810. source "arch/arm/mach-footbridge/Kconfig"
  811. source "arch/arm/mach-gemini/Kconfig"
  812. source "arch/arm/mach-highbank/Kconfig"
  813. source "arch/arm/mach-integrator/Kconfig"
  814. source "arch/arm/mach-iop32x/Kconfig"
  815. source "arch/arm/mach-iop33x/Kconfig"
  816. source "arch/arm/mach-iop13xx/Kconfig"
  817. source "arch/arm/mach-ixp4xx/Kconfig"
  818. source "arch/arm/mach-keystone/Kconfig"
  819. source "arch/arm/mach-kirkwood/Kconfig"
  820. source "arch/arm/mach-ks8695/Kconfig"
  821. source "arch/arm/mach-msm/Kconfig"
  822. source "arch/arm/mach-mv78xx0/Kconfig"
  823. source "arch/arm/mach-imx/Kconfig"
  824. source "arch/arm/mach-mxs/Kconfig"
  825. source "arch/arm/mach-netx/Kconfig"
  826. source "arch/arm/mach-nomadik/Kconfig"
  827. source "arch/arm/mach-nspire/Kconfig"
  828. source "arch/arm/plat-omap/Kconfig"
  829. source "arch/arm/mach-omap1/Kconfig"
  830. source "arch/arm/mach-omap2/Kconfig"
  831. source "arch/arm/mach-orion5x/Kconfig"
  832. source "arch/arm/mach-picoxcell/Kconfig"
  833. source "arch/arm/mach-pxa/Kconfig"
  834. source "arch/arm/plat-pxa/Kconfig"
  835. source "arch/arm/mach-mmp/Kconfig"
  836. source "arch/arm/mach-realview/Kconfig"
  837. source "arch/arm/mach-rockchip/Kconfig"
  838. source "arch/arm/mach-sa1100/Kconfig"
  839. source "arch/arm/plat-samsung/Kconfig"
  840. source "arch/arm/mach-socfpga/Kconfig"
  841. source "arch/arm/mach-spear/Kconfig"
  842. source "arch/arm/mach-sti/Kconfig"
  843. source "arch/arm/mach-s3c24xx/Kconfig"
  844. source "arch/arm/mach-s3c64xx/Kconfig"
  845. source "arch/arm/mach-s5p64x0/Kconfig"
  846. source "arch/arm/mach-s5pc100/Kconfig"
  847. source "arch/arm/mach-s5pv210/Kconfig"
  848. source "arch/arm/mach-exynos/Kconfig"
  849. source "arch/arm/mach-shmobile/Kconfig"
  850. source "arch/arm/mach-sunxi/Kconfig"
  851. source "arch/arm/mach-prima2/Kconfig"
  852. source "arch/arm/mach-tegra/Kconfig"
  853. source "arch/arm/mach-u300/Kconfig"
  854. source "arch/arm/mach-ux500/Kconfig"
  855. source "arch/arm/mach-versatile/Kconfig"
  856. source "arch/arm/mach-vexpress/Kconfig"
  857. source "arch/arm/plat-versatile/Kconfig"
  858. source "arch/arm/mach-virt/Kconfig"
  859. source "arch/arm/mach-vt8500/Kconfig"
  860. source "arch/arm/mach-w90x900/Kconfig"
  861. source "arch/arm/mach-zynq/Kconfig"
  862. # Definitions to make life easier
  863. config ARCH_ACORN
  864. bool
  865. config PLAT_IOP
  866. bool
  867. select GENERIC_CLOCKEVENTS
  868. config PLAT_ORION
  869. bool
  870. select CLKSRC_MMIO
  871. select COMMON_CLK
  872. select GENERIC_IRQ_CHIP
  873. select IRQ_DOMAIN
  874. config PLAT_ORION_LEGACY
  875. bool
  876. select PLAT_ORION
  877. config PLAT_PXA
  878. bool
  879. config PLAT_VERSATILE
  880. bool
  881. config ARM_TIMER_SP804
  882. bool
  883. select CLKSRC_MMIO
  884. select CLKSRC_OF if OF
  885. source arch/arm/mm/Kconfig
  886. config ARM_NR_BANKS
  887. int
  888. default 16 if ARCH_EP93XX
  889. default 8
  890. config IWMMXT
  891. bool "Enable iWMMXt support" if !CPU_PJ4
  892. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  893. default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
  894. help
  895. Enable support for iWMMXt context switching at run time if
  896. running on a CPU that supports it.
  897. config XSCALE_PMU
  898. bool
  899. depends on CPU_XSCALE
  900. default y
  901. config MULTI_IRQ_HANDLER
  902. bool
  903. help
  904. Allow each machine to specify it's own IRQ handler at run time.
  905. if !MMU
  906. source "arch/arm/Kconfig-nommu"
  907. endif
  908. config PJ4B_ERRATA_4742
  909. bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
  910. depends on CPU_PJ4B && MACH_ARMADA_370
  911. default y
  912. help
  913. When coming out of either a Wait for Interrupt (WFI) or a Wait for
  914. Event (WFE) IDLE states, a specific timing sensitivity exists between
  915. the retiring WFI/WFE instructions and the newly issued subsequent
  916. instructions. This sensitivity can result in a CPU hang scenario.
  917. Workaround:
  918. The software must insert either a Data Synchronization Barrier (DSB)
  919. or Data Memory Barrier (DMB) command immediately after the WFI/WFE
  920. instruction
  921. config ARM_ERRATA_326103
  922. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  923. depends on CPU_V6
  924. help
  925. Executing a SWP instruction to read-only memory does not set bit 11
  926. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  927. treat the access as a read, preventing a COW from occurring and
  928. causing the faulting task to livelock.
  929. config ARM_ERRATA_411920
  930. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  931. depends on CPU_V6 || CPU_V6K
  932. help
  933. Invalidation of the Instruction Cache operation can
  934. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  935. It does not affect the MPCore. This option enables the ARM Ltd.
  936. recommended workaround.
  937. config ARM_ERRATA_430973
  938. bool "ARM errata: Stale prediction on replaced interworking branch"
  939. depends on CPU_V7
  940. help
  941. This option enables the workaround for the 430973 Cortex-A8
  942. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  943. interworking branch is replaced with another code sequence at the
  944. same virtual address, whether due to self-modifying code or virtual
  945. to physical address re-mapping, Cortex-A8 does not recover from the
  946. stale interworking branch prediction. This results in Cortex-A8
  947. executing the new code sequence in the incorrect ARM or Thumb state.
  948. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  949. and also flushes the branch target cache at every context switch.
  950. Note that setting specific bits in the ACTLR register may not be
  951. available in non-secure mode.
  952. config ARM_ERRATA_458693
  953. bool "ARM errata: Processor deadlock when a false hazard is created"
  954. depends on CPU_V7
  955. depends on !ARCH_MULTIPLATFORM
  956. help
  957. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  958. erratum. For very specific sequences of memory operations, it is
  959. possible for a hazard condition intended for a cache line to instead
  960. be incorrectly associated with a different cache line. This false
  961. hazard might then cause a processor deadlock. The workaround enables
  962. the L1 caching of the NEON accesses and disables the PLD instruction
  963. in the ACTLR register. Note that setting specific bits in the ACTLR
  964. register may not be available in non-secure mode.
  965. config ARM_ERRATA_460075
  966. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  967. depends on CPU_V7
  968. depends on !ARCH_MULTIPLATFORM
  969. help
  970. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  971. erratum. Any asynchronous access to the L2 cache may encounter a
  972. situation in which recent store transactions to the L2 cache are lost
  973. and overwritten with stale memory contents from external memory. The
  974. workaround disables the write-allocate mode for the L2 cache via the
  975. ACTLR register. Note that setting specific bits in the ACTLR register
  976. may not be available in non-secure mode.
  977. config ARM_ERRATA_742230
  978. bool "ARM errata: DMB operation may be faulty"
  979. depends on CPU_V7 && SMP
  980. depends on !ARCH_MULTIPLATFORM
  981. help
  982. This option enables the workaround for the 742230 Cortex-A9
  983. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  984. between two write operations may not ensure the correct visibility
  985. ordering of the two writes. This workaround sets a specific bit in
  986. the diagnostic register of the Cortex-A9 which causes the DMB
  987. instruction to behave as a DSB, ensuring the correct behaviour of
  988. the two writes.
  989. config ARM_ERRATA_742231
  990. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  991. depends on CPU_V7 && SMP
  992. depends on !ARCH_MULTIPLATFORM
  993. help
  994. This option enables the workaround for the 742231 Cortex-A9
  995. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  996. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  997. accessing some data located in the same cache line, may get corrupted
  998. data due to bad handling of the address hazard when the line gets
  999. replaced from one of the CPUs at the same time as another CPU is
  1000. accessing it. This workaround sets specific bits in the diagnostic
  1001. register of the Cortex-A9 which reduces the linefill issuing
  1002. capabilities of the processor.
  1003. config PL310_ERRATA_588369
  1004. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  1005. depends on CACHE_L2X0
  1006. help
  1007. The PL310 L2 cache controller implements three types of Clean &
  1008. Invalidate maintenance operations: by Physical Address
  1009. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1010. They are architecturally defined to behave as the execution of a
  1011. clean operation followed immediately by an invalidate operation,
  1012. both performing to the same memory location. This functionality
  1013. is not correctly implemented in PL310 as clean lines are not
  1014. invalidated as a result of these operations.
  1015. config ARM_ERRATA_643719
  1016. bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
  1017. depends on CPU_V7 && SMP
  1018. help
  1019. This option enables the workaround for the 643719 Cortex-A9 (prior to
  1020. r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
  1021. register returns zero when it should return one. The workaround
  1022. corrects this value, ensuring cache maintenance operations which use
  1023. it behave as intended and avoiding data corruption.
  1024. config ARM_ERRATA_720789
  1025. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1026. depends on CPU_V7
  1027. help
  1028. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1029. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1030. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1031. As a consequence of this erratum, some TLB entries which should be
  1032. invalidated are not, resulting in an incoherency in the system page
  1033. tables. The workaround changes the TLB flushing routines to invalidate
  1034. entries regardless of the ASID.
  1035. config PL310_ERRATA_727915
  1036. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1037. depends on CACHE_L2X0
  1038. help
  1039. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1040. operation (offset 0x7FC). This operation runs in background so that
  1041. PL310 can handle normal accesses while it is in progress. Under very
  1042. rare circumstances, due to this erratum, write data can be lost when
  1043. PL310 treats a cacheable write transaction during a Clean &
  1044. Invalidate by Way operation.
  1045. config ARM_ERRATA_743622
  1046. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1047. depends on CPU_V7
  1048. depends on !ARCH_MULTIPLATFORM
  1049. help
  1050. This option enables the workaround for the 743622 Cortex-A9
  1051. (r2p*) erratum. Under very rare conditions, a faulty
  1052. optimisation in the Cortex-A9 Store Buffer may lead to data
  1053. corruption. This workaround sets a specific bit in the diagnostic
  1054. register of the Cortex-A9 which disables the Store Buffer
  1055. optimisation, preventing the defect from occurring. This has no
  1056. visible impact on the overall performance or power consumption of the
  1057. processor.
  1058. config ARM_ERRATA_751472
  1059. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1060. depends on CPU_V7
  1061. depends on !ARCH_MULTIPLATFORM
  1062. help
  1063. This option enables the workaround for the 751472 Cortex-A9 (prior
  1064. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1065. completion of a following broadcasted operation if the second
  1066. operation is received by a CPU before the ICIALLUIS has completed,
  1067. potentially leading to corrupted entries in the cache or TLB.
  1068. config PL310_ERRATA_753970
  1069. bool "PL310 errata: cache sync operation may be faulty"
  1070. depends on CACHE_PL310
  1071. help
  1072. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1073. Under some condition the effect of cache sync operation on
  1074. the store buffer still remains when the operation completes.
  1075. This means that the store buffer is always asked to drain and
  1076. this prevents it from merging any further writes. The workaround
  1077. is to replace the normal offset of cache sync operation (0x730)
  1078. by another offset targeting an unmapped PL310 register 0x740.
  1079. This has the same effect as the cache sync operation: store buffer
  1080. drain and waiting for all buffers empty.
  1081. config ARM_ERRATA_754322
  1082. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1083. depends on CPU_V7
  1084. help
  1085. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1086. r3p*) erratum. A speculative memory access may cause a page table walk
  1087. which starts prior to an ASID switch but completes afterwards. This
  1088. can populate the micro-TLB with a stale entry which may be hit with
  1089. the new ASID. This workaround places two dsb instructions in the mm
  1090. switching code so that no page table walks can cross the ASID switch.
  1091. config ARM_ERRATA_754327
  1092. bool "ARM errata: no automatic Store Buffer drain"
  1093. depends on CPU_V7 && SMP
  1094. help
  1095. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1096. r2p0) erratum. The Store Buffer does not have any automatic draining
  1097. mechanism and therefore a livelock may occur if an external agent
  1098. continuously polls a memory location waiting to observe an update.
  1099. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1100. written polling loops from denying visibility of updates to memory.
  1101. config ARM_ERRATA_364296
  1102. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1103. depends on CPU_V6
  1104. help
  1105. This options enables the workaround for the 364296 ARM1136
  1106. r0p2 erratum (possible cache data corruption with
  1107. hit-under-miss enabled). It sets the undocumented bit 31 in
  1108. the auxiliary control register and the FI bit in the control
  1109. register, thus disabling hit-under-miss without putting the
  1110. processor into full low interrupt latency mode. ARM11MPCore
  1111. is not affected.
  1112. config ARM_ERRATA_764369
  1113. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1114. depends on CPU_V7 && SMP
  1115. help
  1116. This option enables the workaround for erratum 764369
  1117. affecting Cortex-A9 MPCore with two or more processors (all
  1118. current revisions). Under certain timing circumstances, a data
  1119. cache line maintenance operation by MVA targeting an Inner
  1120. Shareable memory region may fail to proceed up to either the
  1121. Point of Coherency or to the Point of Unification of the
  1122. system. This workaround adds a DSB instruction before the
  1123. relevant cache maintenance functions and sets a specific bit
  1124. in the diagnostic control register of the SCU.
  1125. config PL310_ERRATA_769419
  1126. bool "PL310 errata: no automatic Store Buffer drain"
  1127. depends on CACHE_L2X0
  1128. help
  1129. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1130. not automatically drain. This can cause normal, non-cacheable
  1131. writes to be retained when the memory system is idle, leading
  1132. to suboptimal I/O performance for drivers using coherent DMA.
  1133. This option adds a write barrier to the cpu_idle loop so that,
  1134. on systems with an outer cache, the store buffer is drained
  1135. explicitly.
  1136. config ARM_ERRATA_775420
  1137. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1138. depends on CPU_V7
  1139. help
  1140. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1141. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1142. operation aborts with MMU exception, it might cause the processor
  1143. to deadlock. This workaround puts DSB before executing ISB if
  1144. an abort may occur on cache maintenance.
  1145. config ARM_ERRATA_798181
  1146. bool "ARM errata: TLBI/DSB failure on Cortex-A15"
  1147. depends on CPU_V7 && SMP
  1148. help
  1149. On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
  1150. adequately shooting down all use of the old entries. This
  1151. option enables the Linux kernel workaround for this erratum
  1152. which sends an IPI to the CPUs that are running the same ASID
  1153. as the one being invalidated.
  1154. config ARM_ERRATA_773022
  1155. bool "ARM errata: incorrect instructions may be executed from loop buffer"
  1156. depends on CPU_V7
  1157. help
  1158. This option enables the workaround for the 773022 Cortex-A15
  1159. (up to r0p4) erratum. In certain rare sequences of code, the
  1160. loop buffer may deliver incorrect instructions. This
  1161. workaround disables the loop buffer to avoid the erratum.
  1162. endmenu
  1163. source "arch/arm/common/Kconfig"
  1164. menu "Bus support"
  1165. config ARM_AMBA
  1166. bool
  1167. config ISA
  1168. bool
  1169. help
  1170. Find out whether you have ISA slots on your motherboard. ISA is the
  1171. name of a bus system, i.e. the way the CPU talks to the other stuff
  1172. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1173. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1174. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1175. # Select ISA DMA controller support
  1176. config ISA_DMA
  1177. bool
  1178. select ISA_DMA_API
  1179. # Select ISA DMA interface
  1180. config ISA_DMA_API
  1181. bool
  1182. config PCI
  1183. bool "PCI support" if MIGHT_HAVE_PCI
  1184. help
  1185. Find out whether you have a PCI motherboard. PCI is the name of a
  1186. bus system, i.e. the way the CPU talks to the other stuff inside
  1187. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1188. VESA. If you have PCI, say Y, otherwise N.
  1189. config PCI_DOMAINS
  1190. bool
  1191. depends on PCI
  1192. config PCI_NANOENGINE
  1193. bool "BSE nanoEngine PCI support"
  1194. depends on SA1100_NANOENGINE
  1195. help
  1196. Enable PCI on the BSE nanoEngine board.
  1197. config PCI_SYSCALL
  1198. def_bool PCI
  1199. config PCI_HOST_ITE8152
  1200. bool
  1201. depends on PCI && MACH_ARMCORE
  1202. default y
  1203. select DMABOUNCE
  1204. source "drivers/pci/Kconfig"
  1205. source "drivers/pci/pcie/Kconfig"
  1206. source "drivers/pcmcia/Kconfig"
  1207. endmenu
  1208. menu "Kernel Features"
  1209. config HAVE_SMP
  1210. bool
  1211. help
  1212. This option should be selected by machines which have an SMP-
  1213. capable CPU.
  1214. The only effect of this option is to make the SMP-related
  1215. options available to the user for configuration.
  1216. config SMP
  1217. bool "Symmetric Multi-Processing"
  1218. depends on CPU_V6K || CPU_V7
  1219. depends on GENERIC_CLOCKEVENTS
  1220. depends on HAVE_SMP
  1221. depends on MMU || ARM_MPU
  1222. select USE_GENERIC_SMP_HELPERS
  1223. help
  1224. This enables support for systems with more than one CPU. If you have
  1225. a system with only one CPU, like most personal computers, say N. If
  1226. you have a system with more than one CPU, say Y.
  1227. If you say N here, the kernel will run on single and multiprocessor
  1228. machines, but will use only one CPU of a multiprocessor machine. If
  1229. you say Y here, the kernel will run on many, but not all, single
  1230. processor machines. On a single processor machine, the kernel will
  1231. run faster if you say N here.
  1232. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1233. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1234. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1235. If you don't know what to do here, say N.
  1236. config SMP_ON_UP
  1237. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1238. depends on SMP && !XIP_KERNEL && MMU
  1239. default y
  1240. help
  1241. SMP kernels contain instructions which fail on non-SMP processors.
  1242. Enabling this option allows the kernel to modify itself to make
  1243. these instructions safe. Disabling it allows about 1K of space
  1244. savings.
  1245. If you don't know what to do here, say Y.
  1246. config ARM_CPU_TOPOLOGY
  1247. bool "Support cpu topology definition"
  1248. depends on SMP && CPU_V7
  1249. default y
  1250. help
  1251. Support ARM cpu topology definition. The MPIDR register defines
  1252. affinity between processors which is then used to describe the cpu
  1253. topology of an ARM System.
  1254. config SCHED_MC
  1255. bool "Multi-core scheduler support"
  1256. depends on ARM_CPU_TOPOLOGY
  1257. help
  1258. Multi-core scheduler support improves the CPU scheduler's decision
  1259. making when dealing with multi-core CPU chips at a cost of slightly
  1260. increased overhead in some places. If unsure say N here.
  1261. config SCHED_SMT
  1262. bool "SMT scheduler support"
  1263. depends on ARM_CPU_TOPOLOGY
  1264. help
  1265. Improves the CPU scheduler's decision making when dealing with
  1266. MultiThreading at a cost of slightly increased overhead in some
  1267. places. If unsure say N here.
  1268. config HAVE_ARM_SCU
  1269. bool
  1270. help
  1271. This option enables support for the ARM system coherency unit
  1272. config HAVE_ARM_ARCH_TIMER
  1273. bool "Architected timer support"
  1274. depends on CPU_V7
  1275. select ARM_ARCH_TIMER
  1276. help
  1277. This option enables support for the ARM architected timer
  1278. config HAVE_ARM_TWD
  1279. bool
  1280. depends on SMP
  1281. select CLKSRC_OF if OF
  1282. help
  1283. This options enables support for the ARM timer and watchdog unit
  1284. config MCPM
  1285. bool "Multi-Cluster Power Management"
  1286. depends on CPU_V7 && SMP
  1287. help
  1288. This option provides the common power management infrastructure
  1289. for (multi-)cluster based systems, such as big.LITTLE based
  1290. systems.
  1291. choice
  1292. prompt "Memory split"
  1293. default VMSPLIT_3G
  1294. help
  1295. Select the desired split between kernel and user memory.
  1296. If you are not absolutely sure what you are doing, leave this
  1297. option alone!
  1298. config VMSPLIT_3G
  1299. bool "3G/1G user/kernel split"
  1300. config VMSPLIT_2G
  1301. bool "2G/2G user/kernel split"
  1302. config VMSPLIT_1G
  1303. bool "1G/3G user/kernel split"
  1304. endchoice
  1305. config PAGE_OFFSET
  1306. hex
  1307. default 0x40000000 if VMSPLIT_1G
  1308. default 0x80000000 if VMSPLIT_2G
  1309. default 0xC0000000
  1310. config NR_CPUS
  1311. int "Maximum number of CPUs (2-32)"
  1312. range 2 32
  1313. depends on SMP
  1314. default "4"
  1315. config HOTPLUG_CPU
  1316. bool "Support for hot-pluggable CPUs"
  1317. depends on SMP
  1318. help
  1319. Say Y here to experiment with turning CPUs off and on. CPUs
  1320. can be controlled through /sys/devices/system/cpu.
  1321. config ARM_PSCI
  1322. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1323. depends on CPU_V7
  1324. help
  1325. Say Y here if you want Linux to communicate with system firmware
  1326. implementing the PSCI specification for CPU-centric power
  1327. management operations described in ARM document number ARM DEN
  1328. 0022A ("Power State Coordination Interface System Software on
  1329. ARM processors").
  1330. # The GPIO number here must be sorted by descending number. In case of
  1331. # a multiplatform kernel, we just want the highest value required by the
  1332. # selected platforms.
  1333. config ARCH_NR_GPIO
  1334. int
  1335. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1336. default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || SOC_DRA7XX
  1337. default 392 if ARCH_U8500
  1338. default 352 if ARCH_VT8500
  1339. default 288 if ARCH_SUNXI
  1340. default 264 if MACH_H4700
  1341. default 0
  1342. help
  1343. Maximum number of GPIOs in the system.
  1344. If unsure, leave the default value.
  1345. source kernel/Kconfig.preempt
  1346. config HZ_FIXED
  1347. int
  1348. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1349. ARCH_S5PV210 || ARCH_EXYNOS4
  1350. default AT91_TIMER_HZ if ARCH_AT91
  1351. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1352. default 0
  1353. choice
  1354. depends on HZ_FIXED = 0
  1355. prompt "Timer frequency"
  1356. config HZ_100
  1357. bool "100 Hz"
  1358. config HZ_200
  1359. bool "200 Hz"
  1360. config HZ_250
  1361. bool "250 Hz"
  1362. config HZ_300
  1363. bool "300 Hz"
  1364. config HZ_500
  1365. bool "500 Hz"
  1366. config HZ_1000
  1367. bool "1000 Hz"
  1368. endchoice
  1369. config HZ
  1370. int
  1371. default HZ_FIXED if HZ_FIXED != 0
  1372. default 100 if HZ_100
  1373. default 200 if HZ_200
  1374. default 250 if HZ_250
  1375. default 300 if HZ_300
  1376. default 500 if HZ_500
  1377. default 1000
  1378. config SCHED_HRTICK
  1379. def_bool HIGH_RES_TIMERS
  1380. config SCHED_HRTICK
  1381. def_bool HIGH_RES_TIMERS
  1382. config THUMB2_KERNEL
  1383. bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
  1384. depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
  1385. default y if CPU_THUMBONLY
  1386. select AEABI
  1387. select ARM_ASM_UNIFIED
  1388. select ARM_UNWIND
  1389. help
  1390. By enabling this option, the kernel will be compiled in
  1391. Thumb-2 mode. A compiler/assembler that understand the unified
  1392. ARM-Thumb syntax is needed.
  1393. If unsure, say N.
  1394. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1395. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1396. depends on THUMB2_KERNEL && MODULES
  1397. default y
  1398. help
  1399. Various binutils versions can resolve Thumb-2 branches to
  1400. locally-defined, preemptible global symbols as short-range "b.n"
  1401. branch instructions.
  1402. This is a problem, because there's no guarantee the final
  1403. destination of the symbol, or any candidate locations for a
  1404. trampoline, are within range of the branch. For this reason, the
  1405. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1406. relocation in modules at all, and it makes little sense to add
  1407. support.
  1408. The symptom is that the kernel fails with an "unsupported
  1409. relocation" error when loading some modules.
  1410. Until fixed tools are available, passing
  1411. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1412. code which hits this problem, at the cost of a bit of extra runtime
  1413. stack usage in some cases.
  1414. The problem is described in more detail at:
  1415. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1416. Only Thumb-2 kernels are affected.
  1417. Unless you are sure your tools don't have this problem, say Y.
  1418. config ARM_ASM_UNIFIED
  1419. bool
  1420. config AEABI
  1421. bool "Use the ARM EABI to compile the kernel"
  1422. help
  1423. This option allows for the kernel to be compiled using the latest
  1424. ARM ABI (aka EABI). This is only useful if you are using a user
  1425. space environment that is also compiled with EABI.
  1426. Since there are major incompatibilities between the legacy ABI and
  1427. EABI, especially with regard to structure member alignment, this
  1428. option also changes the kernel syscall calling convention to
  1429. disambiguate both ABIs and allow for backward compatibility support
  1430. (selected with CONFIG_OABI_COMPAT).
  1431. To use this you need GCC version 4.0.0 or later.
  1432. config OABI_COMPAT
  1433. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1434. depends on AEABI && !THUMB2_KERNEL
  1435. default y
  1436. help
  1437. This option preserves the old syscall interface along with the
  1438. new (ARM EABI) one. It also provides a compatibility layer to
  1439. intercept syscalls that have structure arguments which layout
  1440. in memory differs between the legacy ABI and the new ARM EABI
  1441. (only for non "thumb" binaries). This option adds a tiny
  1442. overhead to all syscalls and produces a slightly larger kernel.
  1443. If you know you'll be using only pure EABI user space then you
  1444. can say N here. If this option is not selected and you attempt
  1445. to execute a legacy ABI binary then the result will be
  1446. UNPREDICTABLE (in fact it can be predicted that it won't work
  1447. at all). If in doubt say Y.
  1448. config ARCH_HAS_HOLES_MEMORYMODEL
  1449. bool
  1450. config ARCH_SPARSEMEM_ENABLE
  1451. bool
  1452. config ARCH_SPARSEMEM_DEFAULT
  1453. def_bool ARCH_SPARSEMEM_ENABLE
  1454. config ARCH_SELECT_MEMORY_MODEL
  1455. def_bool ARCH_SPARSEMEM_ENABLE
  1456. config HAVE_ARCH_PFN_VALID
  1457. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1458. config HIGHMEM
  1459. bool "High Memory Support"
  1460. depends on MMU
  1461. help
  1462. The address space of ARM processors is only 4 Gigabytes large
  1463. and it has to accommodate user address space, kernel address
  1464. space as well as some memory mapped IO. That means that, if you
  1465. have a large amount of physical memory and/or IO, not all of the
  1466. memory can be "permanently mapped" by the kernel. The physical
  1467. memory that is not permanently mapped is called "high memory".
  1468. Depending on the selected kernel/user memory split, minimum
  1469. vmalloc space and actual amount of RAM, you may not need this
  1470. option which should result in a slightly faster kernel.
  1471. If unsure, say n.
  1472. config HIGHPTE
  1473. bool "Allocate 2nd-level pagetables from highmem"
  1474. depends on HIGHMEM
  1475. config HW_PERF_EVENTS
  1476. bool "Enable hardware performance counter support for perf events"
  1477. depends on PERF_EVENTS
  1478. default y
  1479. help
  1480. Enable hardware performance counter support for perf events. If
  1481. disabled, perf events will use software events only.
  1482. config SYS_SUPPORTS_HUGETLBFS
  1483. def_bool y
  1484. depends on ARM_LPAE
  1485. config HAVE_ARCH_TRANSPARENT_HUGEPAGE
  1486. def_bool y
  1487. depends on ARM_LPAE
  1488. config ARCH_WANT_GENERAL_HUGETLB
  1489. def_bool y
  1490. source "mm/Kconfig"
  1491. config FORCE_MAX_ZONEORDER
  1492. int "Maximum zone order" if ARCH_SHMOBILE
  1493. range 11 64 if ARCH_SHMOBILE
  1494. default "12" if SOC_AM33XX
  1495. default "9" if SA1111
  1496. default "11"
  1497. help
  1498. The kernel memory allocator divides physically contiguous memory
  1499. blocks into "zones", where each zone is a power of two number of
  1500. pages. This option selects the largest power of two that the kernel
  1501. keeps in the memory allocator. If you need to allocate very large
  1502. blocks of physically contiguous memory, then you may need to
  1503. increase this value.
  1504. This config option is actually maximum order plus one. For example,
  1505. a value of 11 means that the largest free memory block is 2^10 pages.
  1506. config ALIGNMENT_TRAP
  1507. bool
  1508. depends on CPU_CP15_MMU
  1509. default y if !ARCH_EBSA110
  1510. select HAVE_PROC_CPU if PROC_FS
  1511. help
  1512. ARM processors cannot fetch/store information which is not
  1513. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1514. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1515. fetch/store instructions will be emulated in software if you say
  1516. here, which has a severe performance impact. This is necessary for
  1517. correct operation of some network protocols. With an IP-only
  1518. configuration it is safe to say N, otherwise say Y.
  1519. config UACCESS_WITH_MEMCPY
  1520. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1521. depends on MMU
  1522. default y if CPU_FEROCEON
  1523. help
  1524. Implement faster copy_to_user and clear_user methods for CPU
  1525. cores where a 8-word STM instruction give significantly higher
  1526. memory write throughput than a sequence of individual 32bit stores.
  1527. A possible side effect is a slight increase in scheduling latency
  1528. between threads sharing the same address space if they invoke
  1529. such copy operations with large buffers.
  1530. However, if the CPU data cache is using a write-allocate mode,
  1531. this option is unlikely to provide any performance gain.
  1532. config SECCOMP
  1533. bool
  1534. prompt "Enable seccomp to safely compute untrusted bytecode"
  1535. ---help---
  1536. This kernel feature is useful for number crunching applications
  1537. that may need to compute untrusted bytecode during their
  1538. execution. By using pipes or other transports made available to
  1539. the process as file descriptors supporting the read/write
  1540. syscalls, it's possible to isolate those applications in
  1541. their own address space using seccomp. Once seccomp is
  1542. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1543. and the task is only allowed to execute a few safe syscalls
  1544. defined by each seccomp mode.
  1545. config CC_STACKPROTECTOR
  1546. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1547. help
  1548. This option turns on the -fstack-protector GCC feature. This
  1549. feature puts, at the beginning of functions, a canary value on
  1550. the stack just before the return address, and validates
  1551. the value just before actually returning. Stack based buffer
  1552. overflows (that need to overwrite this return address) now also
  1553. overwrite the canary, which gets detected and the attack is then
  1554. neutralized via a kernel panic.
  1555. This feature requires gcc version 4.2 or above.
  1556. config XEN_DOM0
  1557. def_bool y
  1558. depends on XEN
  1559. config XEN
  1560. bool "Xen guest support on ARM (EXPERIMENTAL)"
  1561. depends on ARM && AEABI && OF
  1562. depends on CPU_V7 && !CPU_V6
  1563. depends on !GENERIC_ATOMIC64
  1564. select ARM_PSCI
  1565. help
  1566. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1567. endmenu
  1568. menu "Boot options"
  1569. config USE_OF
  1570. bool "Flattened Device Tree support"
  1571. select IRQ_DOMAIN
  1572. select OF
  1573. select OF_EARLY_FLATTREE
  1574. help
  1575. Include support for flattened device tree machine descriptions.
  1576. config ATAGS
  1577. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1578. default y
  1579. help
  1580. This is the traditional way of passing data to the kernel at boot
  1581. time. If you are solely relying on the flattened device tree (or
  1582. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1583. to remove ATAGS support from your kernel binary. If unsure,
  1584. leave this to y.
  1585. config DEPRECATED_PARAM_STRUCT
  1586. bool "Provide old way to pass kernel parameters"
  1587. depends on ATAGS
  1588. help
  1589. This was deprecated in 2001 and announced to live on for 5 years.
  1590. Some old boot loaders still use this way.
  1591. # Compressed boot loader in ROM. Yes, we really want to ask about
  1592. # TEXT and BSS so we preserve their values in the config files.
  1593. config ZBOOT_ROM_TEXT
  1594. hex "Compressed ROM boot loader base address"
  1595. default "0"
  1596. help
  1597. The physical address at which the ROM-able zImage is to be
  1598. placed in the target. Platforms which normally make use of
  1599. ROM-able zImage formats normally set this to a suitable
  1600. value in their defconfig file.
  1601. If ZBOOT_ROM is not enabled, this has no effect.
  1602. config ZBOOT_ROM_BSS
  1603. hex "Compressed ROM boot loader BSS address"
  1604. default "0"
  1605. help
  1606. The base address of an area of read/write memory in the target
  1607. for the ROM-able zImage which must be available while the
  1608. decompressor is running. It must be large enough to hold the
  1609. entire decompressed kernel plus an additional 128 KiB.
  1610. Platforms which normally make use of ROM-able zImage formats
  1611. normally set this to a suitable value in their defconfig file.
  1612. If ZBOOT_ROM is not enabled, this has no effect.
  1613. config ZBOOT_ROM
  1614. bool "Compressed boot loader in ROM/flash"
  1615. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1616. help
  1617. Say Y here if you intend to execute your compressed kernel image
  1618. (zImage) directly from ROM or flash. If unsure, say N.
  1619. choice
  1620. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1621. depends on ZBOOT_ROM && ARCH_SH7372
  1622. default ZBOOT_ROM_NONE
  1623. help
  1624. Include experimental SD/MMC loading code in the ROM-able zImage.
  1625. With this enabled it is possible to write the ROM-able zImage
  1626. kernel image to an MMC or SD card and boot the kernel straight
  1627. from the reset vector. At reset the processor Mask ROM will load
  1628. the first part of the ROM-able zImage which in turn loads the
  1629. rest the kernel image to RAM.
  1630. config ZBOOT_ROM_NONE
  1631. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1632. help
  1633. Do not load image from SD or MMC
  1634. config ZBOOT_ROM_MMCIF
  1635. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1636. help
  1637. Load image from MMCIF hardware block.
  1638. config ZBOOT_ROM_SH_MOBILE_SDHI
  1639. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1640. help
  1641. Load image from SDHI hardware block
  1642. endchoice
  1643. config ARM_APPENDED_DTB
  1644. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1645. depends on OF && !ZBOOT_ROM
  1646. help
  1647. With this option, the boot code will look for a device tree binary
  1648. (DTB) appended to zImage
  1649. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1650. This is meant as a backward compatibility convenience for those
  1651. systems with a bootloader that can't be upgraded to accommodate
  1652. the documented boot protocol using a device tree.
  1653. Beware that there is very little in terms of protection against
  1654. this option being confused by leftover garbage in memory that might
  1655. look like a DTB header after a reboot if no actual DTB is appended
  1656. to zImage. Do not leave this option active in a production kernel
  1657. if you don't intend to always append a DTB. Proper passing of the
  1658. location into r2 of a bootloader provided DTB is always preferable
  1659. to this option.
  1660. config ARM_ATAG_DTB_COMPAT
  1661. bool "Supplement the appended DTB with traditional ATAG information"
  1662. depends on ARM_APPENDED_DTB
  1663. help
  1664. Some old bootloaders can't be updated to a DTB capable one, yet
  1665. they provide ATAGs with memory configuration, the ramdisk address,
  1666. the kernel cmdline string, etc. Such information is dynamically
  1667. provided by the bootloader and can't always be stored in a static
  1668. DTB. To allow a device tree enabled kernel to be used with such
  1669. bootloaders, this option allows zImage to extract the information
  1670. from the ATAG list and store it at run time into the appended DTB.
  1671. choice
  1672. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1673. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1674. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1675. bool "Use bootloader kernel arguments if available"
  1676. help
  1677. Uses the command-line options passed by the boot loader instead of
  1678. the device tree bootargs property. If the boot loader doesn't provide
  1679. any, the device tree bootargs property will be used.
  1680. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1681. bool "Extend with bootloader kernel arguments"
  1682. help
  1683. The command-line arguments provided by the boot loader will be
  1684. appended to the the device tree bootargs property.
  1685. endchoice
  1686. config CMDLINE
  1687. string "Default kernel command string"
  1688. default ""
  1689. help
  1690. On some architectures (EBSA110 and CATS), there is currently no way
  1691. for the boot loader to pass arguments to the kernel. For these
  1692. architectures, you should supply some command-line options at build
  1693. time by entering them here. As a minimum, you should specify the
  1694. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1695. choice
  1696. prompt "Kernel command line type" if CMDLINE != ""
  1697. default CMDLINE_FROM_BOOTLOADER
  1698. depends on ATAGS
  1699. config CMDLINE_FROM_BOOTLOADER
  1700. bool "Use bootloader kernel arguments if available"
  1701. help
  1702. Uses the command-line options passed by the boot loader. If
  1703. the boot loader doesn't provide any, the default kernel command
  1704. string provided in CMDLINE will be used.
  1705. config CMDLINE_EXTEND
  1706. bool "Extend bootloader kernel arguments"
  1707. help
  1708. The command-line arguments provided by the boot loader will be
  1709. appended to the default kernel command string.
  1710. config CMDLINE_FORCE
  1711. bool "Always use the default kernel command string"
  1712. help
  1713. Always use the default kernel command string, even if the boot
  1714. loader passes other arguments to the kernel.
  1715. This is useful if you cannot or don't want to change the
  1716. command-line options your boot loader passes to the kernel.
  1717. endchoice
  1718. config XIP_KERNEL
  1719. bool "Kernel Execute-In-Place from ROM"
  1720. depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
  1721. help
  1722. Execute-In-Place allows the kernel to run from non-volatile storage
  1723. directly addressable by the CPU, such as NOR flash. This saves RAM
  1724. space since the text section of the kernel is not loaded from flash
  1725. to RAM. Read-write sections, such as the data section and stack,
  1726. are still copied to RAM. The XIP kernel is not compressed since
  1727. it has to run directly from flash, so it will take more space to
  1728. store it. The flash address used to link the kernel object files,
  1729. and for storing it, is configuration dependent. Therefore, if you
  1730. say Y here, you must know the proper physical address where to
  1731. store the kernel image depending on your own flash memory usage.
  1732. Also note that the make target becomes "make xipImage" rather than
  1733. "make zImage" or "make Image". The final kernel binary to put in
  1734. ROM memory will be arch/arm/boot/xipImage.
  1735. If unsure, say N.
  1736. config XIP_PHYS_ADDR
  1737. hex "XIP Kernel Physical Location"
  1738. depends on XIP_KERNEL
  1739. default "0x00080000"
  1740. help
  1741. This is the physical address in your flash memory the kernel will
  1742. be linked for and stored to. This address is dependent on your
  1743. own flash usage.
  1744. config KEXEC
  1745. bool "Kexec system call (EXPERIMENTAL)"
  1746. depends on (!SMP || PM_SLEEP_SMP)
  1747. help
  1748. kexec is a system call that implements the ability to shutdown your
  1749. current kernel, and to start another kernel. It is like a reboot
  1750. but it is independent of the system firmware. And like a reboot
  1751. you can start any kernel with it, not just Linux.
  1752. It is an ongoing process to be certain the hardware in a machine
  1753. is properly shutdown, so do not be surprised if this code does not
  1754. initially work for you.
  1755. config ATAGS_PROC
  1756. bool "Export atags in procfs"
  1757. depends on ATAGS && KEXEC
  1758. default y
  1759. help
  1760. Should the atags used to boot the kernel be exported in an "atags"
  1761. file in procfs. Useful with kexec.
  1762. config CRASH_DUMP
  1763. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1764. help
  1765. Generate crash dump after being started by kexec. This should
  1766. be normally only set in special crash dump kernels which are
  1767. loaded in the main kernel with kexec-tools into a specially
  1768. reserved region and then later executed after a crash by
  1769. kdump/kexec. The crash dump kernel must be compiled to a
  1770. memory address not used by the main kernel
  1771. For more details see Documentation/kdump/kdump.txt
  1772. config AUTO_ZRELADDR
  1773. bool "Auto calculation of the decompressed kernel image address"
  1774. depends on !ZBOOT_ROM
  1775. help
  1776. ZRELADDR is the physical address where the decompressed kernel
  1777. image will be placed. If AUTO_ZRELADDR is selected, the address
  1778. will be determined at run-time by masking the current IP with
  1779. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1780. from start of memory.
  1781. endmenu
  1782. menu "CPU Power Management"
  1783. if ARCH_HAS_CPUFREQ
  1784. source "drivers/cpufreq/Kconfig"
  1785. endif
  1786. source "drivers/cpuidle/Kconfig"
  1787. endmenu
  1788. menu "Floating point emulation"
  1789. comment "At least one emulation must be selected"
  1790. config FPE_NWFPE
  1791. bool "NWFPE math emulation"
  1792. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1793. ---help---
  1794. Say Y to include the NWFPE floating point emulator in the kernel.
  1795. This is necessary to run most binaries. Linux does not currently
  1796. support floating point hardware so you need to say Y here even if
  1797. your machine has an FPA or floating point co-processor podule.
  1798. You may say N here if you are going to load the Acorn FPEmulator
  1799. early in the bootup.
  1800. config FPE_NWFPE_XP
  1801. bool "Support extended precision"
  1802. depends on FPE_NWFPE
  1803. help
  1804. Say Y to include 80-bit support in the kernel floating-point
  1805. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1806. Note that gcc does not generate 80-bit operations by default,
  1807. so in most cases this option only enlarges the size of the
  1808. floating point emulator without any good reason.
  1809. You almost surely want to say N here.
  1810. config FPE_FASTFPE
  1811. bool "FastFPE math emulation (EXPERIMENTAL)"
  1812. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1813. ---help---
  1814. Say Y here to include the FAST floating point emulator in the kernel.
  1815. This is an experimental much faster emulator which now also has full
  1816. precision for the mantissa. It does not support any exceptions.
  1817. It is very simple, and approximately 3-6 times faster than NWFPE.
  1818. It should be sufficient for most programs. It may be not suitable
  1819. for scientific calculations, but you have to check this for yourself.
  1820. If you do not feel you need a faster FP emulation you should better
  1821. choose NWFPE.
  1822. config VFP
  1823. bool "VFP-format floating point maths"
  1824. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1825. help
  1826. Say Y to include VFP support code in the kernel. This is needed
  1827. if your hardware includes a VFP unit.
  1828. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1829. release notes and additional status information.
  1830. Say N if your target does not have VFP hardware.
  1831. config VFPv3
  1832. bool
  1833. depends on VFP
  1834. default y if CPU_V7
  1835. config NEON
  1836. bool "Advanced SIMD (NEON) Extension support"
  1837. depends on VFPv3 && CPU_V7
  1838. help
  1839. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1840. Extension.
  1841. config KERNEL_MODE_NEON
  1842. bool "Support for NEON in kernel mode"
  1843. depends on NEON && AEABI
  1844. help
  1845. Say Y to include support for NEON in kernel mode.
  1846. endmenu
  1847. menu "Userspace binary formats"
  1848. source "fs/Kconfig.binfmt"
  1849. config ARTHUR
  1850. tristate "RISC OS personality"
  1851. depends on !AEABI
  1852. help
  1853. Say Y here to include the kernel code necessary if you want to run
  1854. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1855. experimental; if this sounds frightening, say N and sleep in peace.
  1856. You can also say M here to compile this support as a module (which
  1857. will be called arthur).
  1858. endmenu
  1859. menu "Power management options"
  1860. source "kernel/power/Kconfig"
  1861. config ARCH_SUSPEND_POSSIBLE
  1862. depends on !ARCH_S5PC100
  1863. depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
  1864. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1865. def_bool y
  1866. config ARM_CPU_SUSPEND
  1867. def_bool PM_SLEEP
  1868. endmenu
  1869. source "net/Kconfig"
  1870. source "drivers/Kconfig"
  1871. source "fs/Kconfig"
  1872. source "arch/arm/Kconfig.debug"
  1873. source "security/Kconfig"
  1874. source "crypto/Kconfig"
  1875. source "lib/Kconfig"
  1876. source "arch/arm/kvm/Kconfig"