Kconfig 64 KB

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  1. config ARM
  2. bool
  3. default y
  4. select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  5. select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  6. select ARCH_HAVE_CUSTOM_GPIO_H
  7. select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  8. select ARCH_WANT_IPC_PARSE_VERSION
  9. select BUILDTIME_EXTABLE_SORT if MMU
  10. select CPU_PM if (SUSPEND || CPU_IDLE)
  11. select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
  12. select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
  13. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  14. select GENERIC_IRQ_PROBE
  15. select GENERIC_IRQ_SHOW
  16. select GENERIC_PCI_IOMAP
  17. select GENERIC_SMP_IDLE_THREAD
  18. select GENERIC_STRNCPY_FROM_USER
  19. select GENERIC_STRNLEN_USER
  20. select HARDIRQS_SW_RESEND
  21. select HAVE_AOUT
  22. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  23. select HAVE_ARCH_KGDB
  24. select HAVE_ARCH_SECCOMP_FILTER
  25. select HAVE_ARCH_TRACEHOOK
  26. select HAVE_BPF_JIT
  27. select HAVE_C_RECORDMCOUNT
  28. select HAVE_DEBUG_KMEMLEAK
  29. select HAVE_DMA_API_DEBUG
  30. select HAVE_DMA_ATTRS
  31. select HAVE_DMA_CONTIGUOUS if MMU
  32. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  33. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  34. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  35. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  36. select HAVE_GENERIC_DMA_COHERENT
  37. select HAVE_GENERIC_HARDIRQS
  38. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  39. select HAVE_IDE if PCI || ISA || PCMCIA
  40. select HAVE_KERNEL_GZIP
  41. select HAVE_KERNEL_LZMA
  42. select HAVE_KERNEL_LZO
  43. select HAVE_KERNEL_XZ
  44. select HAVE_KPROBES if !XIP_KERNEL
  45. select HAVE_KRETPROBES if (HAVE_KPROBES)
  46. select HAVE_MEMBLOCK
  47. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  48. select HAVE_PERF_EVENTS
  49. select HAVE_REGS_AND_STACK_ACCESS_API
  50. select HAVE_SYSCALL_TRACEPOINTS
  51. select HAVE_UID16
  52. select KTIME_SCALAR
  53. select PERF_USE_VMALLOC
  54. select RTC_LIB
  55. select SYS_SUPPORTS_APM_EMULATION
  56. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  57. select MODULES_USE_ELF_REL
  58. select CLONE_BACKWARDS
  59. select OLD_SIGSUSPEND3
  60. select OLD_SIGACTION
  61. help
  62. The ARM series is a line of low-power-consumption RISC chip designs
  63. licensed by ARM Ltd and targeted at embedded applications and
  64. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  65. manufactured, but legacy ARM-based PC hardware remains popular in
  66. Europe. There is an ARM Linux project with a web page at
  67. <http://www.arm.linux.org.uk/>.
  68. config ARM_HAS_SG_CHAIN
  69. bool
  70. config NEED_SG_DMA_LENGTH
  71. bool
  72. config ARM_DMA_USE_IOMMU
  73. bool
  74. select ARM_HAS_SG_CHAIN
  75. select NEED_SG_DMA_LENGTH
  76. if ARM_DMA_USE_IOMMU
  77. config ARM_DMA_IOMMU_ALIGNMENT
  78. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  79. range 4 9
  80. default 8
  81. help
  82. DMA mapping framework by default aligns all buffers to the smallest
  83. PAGE_SIZE order which is greater than or equal to the requested buffer
  84. size. This works well for buffers up to a few hundreds kilobytes, but
  85. for larger buffers it just a waste of address space. Drivers which has
  86. relatively small addressing window (like 64Mib) might run out of
  87. virtual space with just a few allocations.
  88. With this parameter you can specify the maximum PAGE_SIZE order for
  89. DMA IOMMU buffers. Larger buffers will be aligned only to this
  90. specified order. The order is expressed as a power of two multiplied
  91. by the PAGE_SIZE.
  92. endif
  93. config HAVE_PWM
  94. bool
  95. config MIGHT_HAVE_PCI
  96. bool
  97. config SYS_SUPPORTS_APM_EMULATION
  98. bool
  99. config GENERIC_GPIO
  100. bool
  101. config HAVE_TCM
  102. bool
  103. select GENERIC_ALLOCATOR
  104. config HAVE_PROC_CPU
  105. bool
  106. config NO_IOPORT
  107. bool
  108. config EISA
  109. bool
  110. ---help---
  111. The Extended Industry Standard Architecture (EISA) bus was
  112. developed as an open alternative to the IBM MicroChannel bus.
  113. The EISA bus provided some of the features of the IBM MicroChannel
  114. bus while maintaining backward compatibility with cards made for
  115. the older ISA bus. The EISA bus saw limited use between 1988 and
  116. 1995 when it was made obsolete by the PCI bus.
  117. Say Y here if you are building a kernel for an EISA-based machine.
  118. Otherwise, say N.
  119. config SBUS
  120. bool
  121. config STACKTRACE_SUPPORT
  122. bool
  123. default y
  124. config HAVE_LATENCYTOP_SUPPORT
  125. bool
  126. depends on !SMP
  127. default y
  128. config LOCKDEP_SUPPORT
  129. bool
  130. default y
  131. config TRACE_IRQFLAGS_SUPPORT
  132. bool
  133. default y
  134. config RWSEM_GENERIC_SPINLOCK
  135. bool
  136. default y
  137. config RWSEM_XCHGADD_ALGORITHM
  138. bool
  139. config ARCH_HAS_ILOG2_U32
  140. bool
  141. config ARCH_HAS_ILOG2_U64
  142. bool
  143. config ARCH_HAS_CPUFREQ
  144. bool
  145. help
  146. Internal node to signify that the ARCH has CPUFREQ support
  147. and that the relevant menu configurations are displayed for
  148. it.
  149. config GENERIC_HWEIGHT
  150. bool
  151. default y
  152. config GENERIC_CALIBRATE_DELAY
  153. bool
  154. default y
  155. config ARCH_MAY_HAVE_PC_FDC
  156. bool
  157. config ZONE_DMA
  158. bool
  159. config NEED_DMA_MAP_STATE
  160. def_bool y
  161. config ARCH_HAS_DMA_SET_COHERENT_MASK
  162. bool
  163. config GENERIC_ISA_DMA
  164. bool
  165. config FIQ
  166. bool
  167. config NEED_RET_TO_USER
  168. bool
  169. config ARCH_MTD_XIP
  170. bool
  171. config VECTORS_BASE
  172. hex
  173. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  174. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  175. default 0x00000000
  176. help
  177. The base address of exception vectors.
  178. config ARM_PATCH_PHYS_VIRT
  179. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  180. default y
  181. depends on !XIP_KERNEL && MMU
  182. depends on !ARCH_REALVIEW || !SPARSEMEM
  183. help
  184. Patch phys-to-virt and virt-to-phys translation functions at
  185. boot and module load time according to the position of the
  186. kernel in system memory.
  187. This can only be used with non-XIP MMU kernels where the base
  188. of physical memory is at a 16MB boundary.
  189. Only disable this option if you know that you do not require
  190. this feature (eg, building a kernel for a single machine) and
  191. you need to shrink the kernel to the minimal size.
  192. config NEED_MACH_GPIO_H
  193. bool
  194. help
  195. Select this when mach/gpio.h is required to provide special
  196. definitions for this platform. The need for mach/gpio.h should
  197. be avoided when possible.
  198. config NEED_MACH_IO_H
  199. bool
  200. help
  201. Select this when mach/io.h is required to provide special
  202. definitions for this platform. The need for mach/io.h should
  203. be avoided when possible.
  204. config NEED_MACH_MEMORY_H
  205. bool
  206. help
  207. Select this when mach/memory.h is required to provide special
  208. definitions for this platform. The need for mach/memory.h should
  209. be avoided when possible.
  210. config PHYS_OFFSET
  211. hex "Physical address of main memory" if MMU
  212. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  213. default DRAM_BASE if !MMU
  214. help
  215. Please provide the physical address corresponding to the
  216. location of main memory in your system.
  217. config GENERIC_BUG
  218. def_bool y
  219. depends on BUG
  220. source "init/Kconfig"
  221. source "kernel/Kconfig.freezer"
  222. menu "System Type"
  223. config MMU
  224. bool "MMU-based Paged Memory Management Support"
  225. default y
  226. help
  227. Select if you want MMU-based virtualised addressing space
  228. support by paged memory management. If unsure, say 'Y'.
  229. #
  230. # The "ARM system type" choice list is ordered alphabetically by option
  231. # text. Please add new entries in the option alphabetic order.
  232. #
  233. choice
  234. prompt "ARM system type"
  235. default ARCH_VERSATILE if !MMU
  236. default ARCH_MULTIPLATFORM if MMU
  237. config ARCH_MULTIPLATFORM
  238. bool "Allow multiple platforms to be selected"
  239. depends on MMU
  240. select ARM_PATCH_PHYS_VIRT
  241. select AUTO_ZRELADDR
  242. select COMMON_CLK
  243. select MULTI_IRQ_HANDLER
  244. select SPARSE_IRQ
  245. select USE_OF
  246. config ARCH_INTEGRATOR
  247. bool "ARM Ltd. Integrator family"
  248. select ARCH_HAS_CPUFREQ
  249. select ARM_AMBA
  250. select COMMON_CLK
  251. select COMMON_CLK_VERSATILE
  252. select GENERIC_CLOCKEVENTS
  253. select HAVE_TCM
  254. select ICST
  255. select MULTI_IRQ_HANDLER
  256. select NEED_MACH_MEMORY_H
  257. select PLAT_VERSATILE
  258. select SPARSE_IRQ
  259. select VERSATILE_FPGA_IRQ
  260. help
  261. Support for ARM's Integrator platform.
  262. config ARCH_REALVIEW
  263. bool "ARM Ltd. RealView family"
  264. select ARCH_WANT_OPTIONAL_GPIOLIB
  265. select ARM_AMBA
  266. select ARM_TIMER_SP804
  267. select COMMON_CLK
  268. select COMMON_CLK_VERSATILE
  269. select GENERIC_CLOCKEVENTS
  270. select GPIO_PL061 if GPIOLIB
  271. select ICST
  272. select NEED_MACH_MEMORY_H
  273. select PLAT_VERSATILE
  274. select PLAT_VERSATILE_CLCD
  275. help
  276. This enables support for ARM Ltd RealView boards.
  277. config ARCH_VERSATILE
  278. bool "ARM Ltd. Versatile family"
  279. select ARCH_WANT_OPTIONAL_GPIOLIB
  280. select ARM_AMBA
  281. select ARM_TIMER_SP804
  282. select ARM_VIC
  283. select CLKDEV_LOOKUP
  284. select GENERIC_CLOCKEVENTS
  285. select HAVE_MACH_CLKDEV
  286. select ICST
  287. select PLAT_VERSATILE
  288. select PLAT_VERSATILE_CLCD
  289. select PLAT_VERSATILE_CLOCK
  290. select VERSATILE_FPGA_IRQ
  291. help
  292. This enables support for ARM Ltd Versatile board.
  293. config ARCH_AT91
  294. bool "Atmel AT91"
  295. select ARCH_REQUIRE_GPIOLIB
  296. select CLKDEV_LOOKUP
  297. select HAVE_CLK
  298. select IRQ_DOMAIN
  299. select NEED_MACH_GPIO_H
  300. select NEED_MACH_IO_H if PCCARD
  301. select PINCTRL
  302. select PINCTRL_AT91 if USE_OF
  303. help
  304. This enables support for systems based on Atmel
  305. AT91RM9200 and AT91SAM9* processors.
  306. config ARCH_CLPS711X
  307. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  308. select ARCH_REQUIRE_GPIOLIB
  309. select AUTO_ZRELADDR
  310. select CLKDEV_LOOKUP
  311. select COMMON_CLK
  312. select CPU_ARM720T
  313. select GENERIC_CLOCKEVENTS
  314. select MULTI_IRQ_HANDLER
  315. select NEED_MACH_MEMORY_H
  316. select SPARSE_IRQ
  317. help
  318. Support for Cirrus Logic 711x/721x/731x based boards.
  319. config ARCH_GEMINI
  320. bool "Cortina Systems Gemini"
  321. select ARCH_REQUIRE_GPIOLIB
  322. select ARCH_USES_GETTIMEOFFSET
  323. select CPU_FA526
  324. help
  325. Support for the Cortina Systems Gemini family SoCs
  326. config ARCH_EBSA110
  327. bool "EBSA-110"
  328. select ARCH_USES_GETTIMEOFFSET
  329. select CPU_SA110
  330. select ISA
  331. select NEED_MACH_IO_H
  332. select NEED_MACH_MEMORY_H
  333. select NO_IOPORT
  334. help
  335. This is an evaluation board for the StrongARM processor available
  336. from Digital. It has limited hardware on-board, including an
  337. Ethernet interface, two PCMCIA sockets, two serial ports and a
  338. parallel port.
  339. config ARCH_EP93XX
  340. bool "EP93xx-based"
  341. select ARCH_HAS_HOLES_MEMORYMODEL
  342. select ARCH_REQUIRE_GPIOLIB
  343. select ARCH_USES_GETTIMEOFFSET
  344. select ARM_AMBA
  345. select ARM_VIC
  346. select CLKDEV_LOOKUP
  347. select CPU_ARM920T
  348. select NEED_MACH_MEMORY_H
  349. help
  350. This enables support for the Cirrus EP93xx series of CPUs.
  351. config ARCH_FOOTBRIDGE
  352. bool "FootBridge"
  353. select CPU_SA110
  354. select FOOTBRIDGE
  355. select GENERIC_CLOCKEVENTS
  356. select HAVE_IDE
  357. select NEED_MACH_IO_H if !MMU
  358. select NEED_MACH_MEMORY_H
  359. help
  360. Support for systems based on the DC21285 companion chip
  361. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  362. config ARCH_NETX
  363. bool "Hilscher NetX based"
  364. select ARM_VIC
  365. select CLKSRC_MMIO
  366. select CPU_ARM926T
  367. select GENERIC_CLOCKEVENTS
  368. help
  369. This enables support for systems based on the Hilscher NetX Soc
  370. config ARCH_H720X
  371. bool "Hynix HMS720x-based"
  372. select ARCH_USES_GETTIMEOFFSET
  373. select CPU_ARM720T
  374. select ISA_DMA_API
  375. help
  376. This enables support for systems based on the Hynix HMS720x
  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. help
  424. Support for Intel's IXP4XX (XScale) family of processors.
  425. config ARCH_DOVE
  426. bool "Marvell Dove"
  427. select ARCH_REQUIRE_GPIOLIB
  428. select CPU_V7
  429. select GENERIC_CLOCKEVENTS
  430. select MIGHT_HAVE_PCI
  431. select PINCTRL
  432. select PINCTRL_DOVE
  433. select PLAT_ORION_LEGACY
  434. select USB_ARCH_HAS_EHCI
  435. help
  436. Support for the Marvell Dove SoC 88AP510
  437. config ARCH_KIRKWOOD
  438. bool "Marvell Kirkwood"
  439. select ARCH_REQUIRE_GPIOLIB
  440. select CPU_FEROCEON
  441. select GENERIC_CLOCKEVENTS
  442. select PCI
  443. select PCI_QUIRKS
  444. select PINCTRL
  445. select PINCTRL_KIRKWOOD
  446. select PLAT_ORION_LEGACY
  447. help
  448. Support for the following Marvell Kirkwood series SoCs:
  449. 88F6180, 88F6192 and 88F6281.
  450. config ARCH_MV78XX0
  451. bool "Marvell MV78xx0"
  452. select ARCH_REQUIRE_GPIOLIB
  453. select CPU_FEROCEON
  454. select GENERIC_CLOCKEVENTS
  455. select PCI
  456. select PLAT_ORION_LEGACY
  457. help
  458. Support for the following Marvell MV78xx0 series SoCs:
  459. MV781x0, MV782x0.
  460. config ARCH_ORION5X
  461. bool "Marvell Orion"
  462. depends on MMU
  463. select ARCH_REQUIRE_GPIOLIB
  464. select CPU_FEROCEON
  465. select GENERIC_CLOCKEVENTS
  466. select PCI
  467. select PLAT_ORION_LEGACY
  468. help
  469. Support for the following Marvell Orion 5x series SoCs:
  470. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  471. Orion-2 (5281), Orion-1-90 (6183).
  472. config ARCH_MMP
  473. bool "Marvell PXA168/910/MMP2"
  474. depends on MMU
  475. select ARCH_REQUIRE_GPIOLIB
  476. select CLKDEV_LOOKUP
  477. select GENERIC_ALLOCATOR
  478. select GENERIC_CLOCKEVENTS
  479. select GPIO_PXA
  480. select IRQ_DOMAIN
  481. select NEED_MACH_GPIO_H
  482. select PINCTRL
  483. select PLAT_PXA
  484. select SPARSE_IRQ
  485. help
  486. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  487. config ARCH_KS8695
  488. bool "Micrel/Kendin KS8695"
  489. select ARCH_REQUIRE_GPIOLIB
  490. select CLKSRC_MMIO
  491. select CPU_ARM922T
  492. select GENERIC_CLOCKEVENTS
  493. select NEED_MACH_MEMORY_H
  494. help
  495. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  496. System-on-Chip devices.
  497. config ARCH_W90X900
  498. bool "Nuvoton W90X900 CPU"
  499. select ARCH_REQUIRE_GPIOLIB
  500. select CLKDEV_LOOKUP
  501. select CLKSRC_MMIO
  502. select CPU_ARM926T
  503. select GENERIC_CLOCKEVENTS
  504. help
  505. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  506. At present, the w90x900 has been renamed nuc900, regarding
  507. the ARM series product line, you can login the following
  508. link address to know more.
  509. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  510. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  511. config ARCH_LPC32XX
  512. bool "NXP LPC32XX"
  513. select ARCH_REQUIRE_GPIOLIB
  514. select ARM_AMBA
  515. select CLKDEV_LOOKUP
  516. select CLKSRC_MMIO
  517. select CPU_ARM926T
  518. select GENERIC_CLOCKEVENTS
  519. select HAVE_IDE
  520. select HAVE_PWM
  521. select USB_ARCH_HAS_OHCI
  522. select USE_OF
  523. help
  524. Support for the NXP LPC32XX family of processors
  525. config ARCH_PXA
  526. bool "PXA2xx/PXA3xx-based"
  527. depends on MMU
  528. select ARCH_HAS_CPUFREQ
  529. select ARCH_MTD_XIP
  530. select ARCH_REQUIRE_GPIOLIB
  531. select ARM_CPU_SUSPEND if PM
  532. select AUTO_ZRELADDR
  533. select CLKDEV_LOOKUP
  534. select CLKSRC_MMIO
  535. select GENERIC_CLOCKEVENTS
  536. select GPIO_PXA
  537. select HAVE_IDE
  538. select MULTI_IRQ_HANDLER
  539. select NEED_MACH_GPIO_H
  540. select PLAT_PXA
  541. select SPARSE_IRQ
  542. help
  543. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  544. config ARCH_MSM
  545. bool "Qualcomm MSM"
  546. select ARCH_REQUIRE_GPIOLIB
  547. select CLKDEV_LOOKUP
  548. select GENERIC_CLOCKEVENTS
  549. select HAVE_CLK
  550. help
  551. Support for Qualcomm MSM/QSD based systems. This runs on the
  552. apps processor of the MSM/QSD and depends on a shared memory
  553. interface to the modem processor which runs the baseband
  554. stack and controls some vital subsystems
  555. (clock and power control, etc).
  556. config ARCH_SHMOBILE
  557. bool "Renesas SH-Mobile / R-Mobile"
  558. select CLKDEV_LOOKUP
  559. select GENERIC_CLOCKEVENTS
  560. select HAVE_ARM_SCU if SMP
  561. select HAVE_ARM_TWD if LOCAL_TIMERS
  562. select HAVE_CLK
  563. select HAVE_MACH_CLKDEV
  564. select HAVE_SMP
  565. select MIGHT_HAVE_CACHE_L2X0
  566. select MULTI_IRQ_HANDLER
  567. select NEED_MACH_MEMORY_H
  568. select NO_IOPORT
  569. select PINCTRL
  570. select PM_GENERIC_DOMAINS if PM
  571. select SPARSE_IRQ
  572. help
  573. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  574. config ARCH_RPC
  575. bool "RiscPC"
  576. select ARCH_ACORN
  577. select ARCH_MAY_HAVE_PC_FDC
  578. select ARCH_SPARSEMEM_ENABLE
  579. select ARCH_USES_GETTIMEOFFSET
  580. select FIQ
  581. select HAVE_IDE
  582. select HAVE_PATA_PLATFORM
  583. select ISA_DMA_API
  584. select NEED_MACH_IO_H
  585. select NEED_MACH_MEMORY_H
  586. select NO_IOPORT
  587. select VIRT_TO_BUS
  588. help
  589. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  590. CD-ROM interface, serial and parallel port, and the floppy drive.
  591. config ARCH_SA1100
  592. bool "SA1100-based"
  593. select ARCH_HAS_CPUFREQ
  594. select ARCH_MTD_XIP
  595. select ARCH_REQUIRE_GPIOLIB
  596. select ARCH_SPARSEMEM_ENABLE
  597. select CLKDEV_LOOKUP
  598. select CLKSRC_MMIO
  599. select CPU_FREQ
  600. select CPU_SA1100
  601. select GENERIC_CLOCKEVENTS
  602. select HAVE_IDE
  603. select ISA
  604. select NEED_MACH_GPIO_H
  605. select NEED_MACH_MEMORY_H
  606. select SPARSE_IRQ
  607. help
  608. Support for StrongARM 11x0 based boards.
  609. config ARCH_S3C24XX
  610. bool "Samsung S3C24XX SoCs"
  611. select ARCH_HAS_CPUFREQ
  612. select ARCH_USES_GETTIMEOFFSET
  613. select CLKDEV_LOOKUP
  614. select HAVE_CLK
  615. select HAVE_S3C2410_I2C if I2C
  616. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  617. select HAVE_S3C_RTC if RTC_CLASS
  618. select NEED_MACH_GPIO_H
  619. select NEED_MACH_IO_H
  620. help
  621. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  622. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  623. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  624. Samsung SMDK2410 development board (and derivatives).
  625. config ARCH_S3C64XX
  626. bool "Samsung S3C64XX"
  627. select ARCH_HAS_CPUFREQ
  628. select ARCH_REQUIRE_GPIOLIB
  629. select ARCH_USES_GETTIMEOFFSET
  630. select ARM_VIC
  631. select CLKDEV_LOOKUP
  632. select CPU_V6
  633. select HAVE_CLK
  634. select HAVE_S3C2410_I2C if I2C
  635. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  636. select HAVE_TCM
  637. select NEED_MACH_GPIO_H
  638. select NO_IOPORT
  639. select PLAT_SAMSUNG
  640. select S3C_DEV_NAND
  641. select S3C_GPIO_TRACK
  642. select SAMSUNG_CLKSRC
  643. select SAMSUNG_GPIOLIB_4BIT
  644. select SAMSUNG_IRQ_VIC_TIMER
  645. select USB_ARCH_HAS_OHCI
  646. help
  647. Samsung S3C64XX series based systems
  648. config ARCH_S5P64X0
  649. bool "Samsung S5P6440 S5P6450"
  650. select CLKDEV_LOOKUP
  651. select CLKSRC_MMIO
  652. select CPU_V6
  653. select GENERIC_CLOCKEVENTS
  654. select HAVE_CLK
  655. select HAVE_S3C2410_I2C if I2C
  656. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  657. select HAVE_S3C_RTC if RTC_CLASS
  658. select NEED_MACH_GPIO_H
  659. help
  660. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  661. SMDK6450.
  662. config ARCH_S5PC100
  663. bool "Samsung S5PC100"
  664. select ARCH_USES_GETTIMEOFFSET
  665. select CLKDEV_LOOKUP
  666. select CPU_V7
  667. select HAVE_CLK
  668. select HAVE_S3C2410_I2C if I2C
  669. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  670. select HAVE_S3C_RTC if RTC_CLASS
  671. select NEED_MACH_GPIO_H
  672. help
  673. Samsung S5PC100 series based systems
  674. config ARCH_S5PV210
  675. bool "Samsung S5PV210/S5PC110"
  676. select ARCH_HAS_CPUFREQ
  677. select ARCH_HAS_HOLES_MEMORYMODEL
  678. select ARCH_SPARSEMEM_ENABLE
  679. select CLKDEV_LOOKUP
  680. select CLKSRC_MMIO
  681. select CPU_V7
  682. select GENERIC_CLOCKEVENTS
  683. select HAVE_CLK
  684. select HAVE_S3C2410_I2C if I2C
  685. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  686. select HAVE_S3C_RTC if RTC_CLASS
  687. select NEED_MACH_GPIO_H
  688. select NEED_MACH_MEMORY_H
  689. help
  690. Samsung S5PV210/S5PC110 series based systems
  691. config ARCH_EXYNOS_SINGLE
  692. bool "Samsung EXYNOS"
  693. select ARCH_HAS_HOLES_MEMORYMODEL
  694. select ARCH_SPARSEMEM_ENABLE
  695. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  696. select NEED_MACH_GPIO_H
  697. select NEED_MACH_MEMORY_H
  698. help
  699. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  700. config ARCH_SHARK
  701. bool "Shark"
  702. select ARCH_USES_GETTIMEOFFSET
  703. select CPU_SA110
  704. select ISA
  705. select ISA_DMA
  706. select NEED_MACH_MEMORY_H
  707. select PCI
  708. select VIRT_TO_BUS
  709. select ZONE_DMA
  710. help
  711. Support for the StrongARM based Digital DNARD machine, also known
  712. as "Shark" (<http://www.shark-linux.de/shark.html>).
  713. config ARCH_U300
  714. bool "ST-Ericsson U300 Series"
  715. depends on MMU
  716. select ARCH_REQUIRE_GPIOLIB
  717. select ARM_AMBA
  718. select ARM_PATCH_PHYS_VIRT
  719. select ARM_VIC
  720. select CLKDEV_LOOKUP
  721. select CLKSRC_MMIO
  722. select COMMON_CLK
  723. select CPU_ARM926T
  724. select GENERIC_CLOCKEVENTS
  725. select HAVE_TCM
  726. select SPARSE_IRQ
  727. help
  728. Support for ST-Ericsson U300 series mobile platforms.
  729. config ARCH_DAVINCI
  730. bool "TI DaVinci"
  731. select ARCH_HAS_HOLES_MEMORYMODEL
  732. select ARCH_REQUIRE_GPIOLIB
  733. select CLKDEV_LOOKUP
  734. select GENERIC_ALLOCATOR
  735. select GENERIC_CLOCKEVENTS
  736. select GENERIC_IRQ_CHIP
  737. select HAVE_IDE
  738. select NEED_MACH_GPIO_H
  739. select USE_OF
  740. select ZONE_DMA
  741. help
  742. Support for TI's DaVinci platform.
  743. config ARCH_OMAP1
  744. bool "TI OMAP1"
  745. depends on MMU
  746. select ARCH_HAS_CPUFREQ
  747. select ARCH_HAS_HOLES_MEMORYMODEL
  748. select ARCH_OMAP
  749. select ARCH_REQUIRE_GPIOLIB
  750. select CLKDEV_LOOKUP
  751. select CLKSRC_MMIO
  752. select GENERIC_CLOCKEVENTS
  753. select GENERIC_IRQ_CHIP
  754. select HAVE_CLK
  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_V4
  766. bool "ARMv4 based platforms (FA526, StrongARM)"
  767. depends on !ARCH_MULTI_V6_V7
  768. select ARCH_MULTI_V4_V5
  769. config ARCH_MULTI_V4T
  770. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  771. depends on !ARCH_MULTI_V6_V7
  772. select ARCH_MULTI_V4_V5
  773. config ARCH_MULTI_V5
  774. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  775. depends on !ARCH_MULTI_V6_V7
  776. select ARCH_MULTI_V4_V5
  777. config ARCH_MULTI_V4_V5
  778. bool
  779. config ARCH_MULTI_V6
  780. bool "ARMv6 based platforms (ARM11)"
  781. select ARCH_MULTI_V6_V7
  782. select CPU_V6
  783. config ARCH_MULTI_V7
  784. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  785. default y
  786. select ARCH_MULTI_V6_V7
  787. select ARCH_VEXPRESS
  788. select CPU_V7
  789. config ARCH_MULTI_V6_V7
  790. bool
  791. config ARCH_MULTI_CPU_AUTO
  792. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  793. select ARCH_MULTI_V5
  794. endmenu
  795. #
  796. # This is sorted alphabetically by mach-* pathname. However, plat-*
  797. # Kconfigs may be included either alphabetically (according to the
  798. # plat- suffix) or along side the corresponding mach-* source.
  799. #
  800. source "arch/arm/mach-mvebu/Kconfig"
  801. source "arch/arm/mach-at91/Kconfig"
  802. source "arch/arm/mach-bcm/Kconfig"
  803. source "arch/arm/mach-bcm2835/Kconfig"
  804. source "arch/arm/mach-clps711x/Kconfig"
  805. source "arch/arm/mach-cns3xxx/Kconfig"
  806. source "arch/arm/mach-davinci/Kconfig"
  807. source "arch/arm/mach-dove/Kconfig"
  808. source "arch/arm/mach-ep93xx/Kconfig"
  809. source "arch/arm/mach-footbridge/Kconfig"
  810. source "arch/arm/mach-gemini/Kconfig"
  811. source "arch/arm/mach-h720x/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-kirkwood/Kconfig"
  819. source "arch/arm/mach-ks8695/Kconfig"
  820. source "arch/arm/mach-msm/Kconfig"
  821. source "arch/arm/mach-mv78xx0/Kconfig"
  822. source "arch/arm/mach-imx/Kconfig"
  823. source "arch/arm/mach-mxs/Kconfig"
  824. source "arch/arm/mach-netx/Kconfig"
  825. source "arch/arm/mach-nomadik/Kconfig"
  826. source "arch/arm/plat-omap/Kconfig"
  827. source "arch/arm/mach-omap1/Kconfig"
  828. source "arch/arm/mach-omap2/Kconfig"
  829. source "arch/arm/mach-orion5x/Kconfig"
  830. source "arch/arm/mach-picoxcell/Kconfig"
  831. source "arch/arm/mach-pxa/Kconfig"
  832. source "arch/arm/plat-pxa/Kconfig"
  833. source "arch/arm/mach-mmp/Kconfig"
  834. source "arch/arm/mach-realview/Kconfig"
  835. source "arch/arm/mach-sa1100/Kconfig"
  836. source "arch/arm/plat-samsung/Kconfig"
  837. source "arch/arm/mach-socfpga/Kconfig"
  838. source "arch/arm/mach-spear/Kconfig"
  839. source "arch/arm/mach-s3c24xx/Kconfig"
  840. if ARCH_S3C64XX
  841. source "arch/arm/mach-s3c64xx/Kconfig"
  842. endif
  843. source "arch/arm/mach-s5p64x0/Kconfig"
  844. source "arch/arm/mach-s5pc100/Kconfig"
  845. source "arch/arm/mach-s5pv210/Kconfig"
  846. source "arch/arm/mach-exynos/Kconfig"
  847. source "arch/arm/mach-shmobile/Kconfig"
  848. source "arch/arm/mach-sunxi/Kconfig"
  849. source "arch/arm/mach-prima2/Kconfig"
  850. source "arch/arm/mach-tegra/Kconfig"
  851. source "arch/arm/mach-u300/Kconfig"
  852. source "arch/arm/mach-ux500/Kconfig"
  853. source "arch/arm/mach-versatile/Kconfig"
  854. source "arch/arm/mach-vexpress/Kconfig"
  855. source "arch/arm/plat-versatile/Kconfig"
  856. source "arch/arm/mach-virt/Kconfig"
  857. source "arch/arm/mach-vt8500/Kconfig"
  858. source "arch/arm/mach-w90x900/Kconfig"
  859. source "arch/arm/mach-zynq/Kconfig"
  860. # Definitions to make life easier
  861. config ARCH_ACORN
  862. bool
  863. config PLAT_IOP
  864. bool
  865. select GENERIC_CLOCKEVENTS
  866. config PLAT_ORION
  867. bool
  868. select CLKSRC_MMIO
  869. select COMMON_CLK
  870. select GENERIC_IRQ_CHIP
  871. select IRQ_DOMAIN
  872. config PLAT_ORION_LEGACY
  873. bool
  874. select PLAT_ORION
  875. config PLAT_PXA
  876. bool
  877. config PLAT_VERSATILE
  878. bool
  879. config ARM_TIMER_SP804
  880. bool
  881. select CLKSRC_MMIO
  882. select HAVE_SCHED_CLOCK
  883. source arch/arm/mm/Kconfig
  884. config ARM_NR_BANKS
  885. int
  886. default 16 if ARCH_EP93XX
  887. default 8
  888. config IWMMXT
  889. bool "Enable iWMMXt support"
  890. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  891. default y if PXA27x || PXA3xx || ARCH_MMP
  892. help
  893. Enable support for iWMMXt context switching at run time if
  894. running on a CPU that supports it.
  895. config XSCALE_PMU
  896. bool
  897. depends on CPU_XSCALE
  898. default y
  899. config MULTI_IRQ_HANDLER
  900. bool
  901. help
  902. Allow each machine to specify it's own IRQ handler at run time.
  903. if !MMU
  904. source "arch/arm/Kconfig-nommu"
  905. endif
  906. config ARM_ERRATA_326103
  907. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  908. depends on CPU_V6
  909. help
  910. Executing a SWP instruction to read-only memory does not set bit 11
  911. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  912. treat the access as a read, preventing a COW from occurring and
  913. causing the faulting task to livelock.
  914. config ARM_ERRATA_411920
  915. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  916. depends on CPU_V6 || CPU_V6K
  917. help
  918. Invalidation of the Instruction Cache operation can
  919. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  920. It does not affect the MPCore. This option enables the ARM Ltd.
  921. recommended workaround.
  922. config ARM_ERRATA_430973
  923. bool "ARM errata: Stale prediction on replaced interworking branch"
  924. depends on CPU_V7
  925. help
  926. This option enables the workaround for the 430973 Cortex-A8
  927. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  928. interworking branch is replaced with another code sequence at the
  929. same virtual address, whether due to self-modifying code or virtual
  930. to physical address re-mapping, Cortex-A8 does not recover from the
  931. stale interworking branch prediction. This results in Cortex-A8
  932. executing the new code sequence in the incorrect ARM or Thumb state.
  933. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  934. and also flushes the branch target cache at every context switch.
  935. Note that setting specific bits in the ACTLR register may not be
  936. available in non-secure mode.
  937. config ARM_ERRATA_458693
  938. bool "ARM errata: Processor deadlock when a false hazard is created"
  939. depends on CPU_V7
  940. depends on !ARCH_MULTIPLATFORM
  941. help
  942. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  943. erratum. For very specific sequences of memory operations, it is
  944. possible for a hazard condition intended for a cache line to instead
  945. be incorrectly associated with a different cache line. This false
  946. hazard might then cause a processor deadlock. The workaround enables
  947. the L1 caching of the NEON accesses and disables the PLD instruction
  948. in the ACTLR register. Note that setting specific bits in the ACTLR
  949. register may not be available in non-secure mode.
  950. config ARM_ERRATA_460075
  951. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  952. depends on CPU_V7
  953. depends on !ARCH_MULTIPLATFORM
  954. help
  955. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  956. erratum. Any asynchronous access to the L2 cache may encounter a
  957. situation in which recent store transactions to the L2 cache are lost
  958. and overwritten with stale memory contents from external memory. The
  959. workaround disables the write-allocate mode for the L2 cache via the
  960. ACTLR register. Note that setting specific bits in the ACTLR register
  961. may not be available in non-secure mode.
  962. config ARM_ERRATA_742230
  963. bool "ARM errata: DMB operation may be faulty"
  964. depends on CPU_V7 && SMP
  965. depends on !ARCH_MULTIPLATFORM
  966. help
  967. This option enables the workaround for the 742230 Cortex-A9
  968. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  969. between two write operations may not ensure the correct visibility
  970. ordering of the two writes. This workaround sets a specific bit in
  971. the diagnostic register of the Cortex-A9 which causes the DMB
  972. instruction to behave as a DSB, ensuring the correct behaviour of
  973. the two writes.
  974. config ARM_ERRATA_742231
  975. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  976. depends on CPU_V7 && SMP
  977. depends on !ARCH_MULTIPLATFORM
  978. help
  979. This option enables the workaround for the 742231 Cortex-A9
  980. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  981. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  982. accessing some data located in the same cache line, may get corrupted
  983. data due to bad handling of the address hazard when the line gets
  984. replaced from one of the CPUs at the same time as another CPU is
  985. accessing it. This workaround sets specific bits in the diagnostic
  986. register of the Cortex-A9 which reduces the linefill issuing
  987. capabilities of the processor.
  988. config PL310_ERRATA_588369
  989. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  990. depends on CACHE_L2X0
  991. help
  992. The PL310 L2 cache controller implements three types of Clean &
  993. Invalidate maintenance operations: by Physical Address
  994. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  995. They are architecturally defined to behave as the execution of a
  996. clean operation followed immediately by an invalidate operation,
  997. both performing to the same memory location. This functionality
  998. is not correctly implemented in PL310 as clean lines are not
  999. invalidated as a result of these operations.
  1000. config ARM_ERRATA_720789
  1001. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1002. depends on CPU_V7
  1003. help
  1004. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1005. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1006. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1007. As a consequence of this erratum, some TLB entries which should be
  1008. invalidated are not, resulting in an incoherency in the system page
  1009. tables. The workaround changes the TLB flushing routines to invalidate
  1010. entries regardless of the ASID.
  1011. config PL310_ERRATA_727915
  1012. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1013. depends on CACHE_L2X0
  1014. help
  1015. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1016. operation (offset 0x7FC). This operation runs in background so that
  1017. PL310 can handle normal accesses while it is in progress. Under very
  1018. rare circumstances, due to this erratum, write data can be lost when
  1019. PL310 treats a cacheable write transaction during a Clean &
  1020. Invalidate by Way operation.
  1021. config ARM_ERRATA_743622
  1022. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1023. depends on CPU_V7
  1024. depends on !ARCH_MULTIPLATFORM
  1025. help
  1026. This option enables the workaround for the 743622 Cortex-A9
  1027. (r2p*) erratum. Under very rare conditions, a faulty
  1028. optimisation in the Cortex-A9 Store Buffer may lead to data
  1029. corruption. This workaround sets a specific bit in the diagnostic
  1030. register of the Cortex-A9 which disables the Store Buffer
  1031. optimisation, preventing the defect from occurring. This has no
  1032. visible impact on the overall performance or power consumption of the
  1033. processor.
  1034. config ARM_ERRATA_751472
  1035. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1036. depends on CPU_V7
  1037. depends on !ARCH_MULTIPLATFORM
  1038. help
  1039. This option enables the workaround for the 751472 Cortex-A9 (prior
  1040. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1041. completion of a following broadcasted operation if the second
  1042. operation is received by a CPU before the ICIALLUIS has completed,
  1043. potentially leading to corrupted entries in the cache or TLB.
  1044. config PL310_ERRATA_753970
  1045. bool "PL310 errata: cache sync operation may be faulty"
  1046. depends on CACHE_PL310
  1047. help
  1048. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1049. Under some condition the effect of cache sync operation on
  1050. the store buffer still remains when the operation completes.
  1051. This means that the store buffer is always asked to drain and
  1052. this prevents it from merging any further writes. The workaround
  1053. is to replace the normal offset of cache sync operation (0x730)
  1054. by another offset targeting an unmapped PL310 register 0x740.
  1055. This has the same effect as the cache sync operation: store buffer
  1056. drain and waiting for all buffers empty.
  1057. config ARM_ERRATA_754322
  1058. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1059. depends on CPU_V7
  1060. help
  1061. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1062. r3p*) erratum. A speculative memory access may cause a page table walk
  1063. which starts prior to an ASID switch but completes afterwards. This
  1064. can populate the micro-TLB with a stale entry which may be hit with
  1065. the new ASID. This workaround places two dsb instructions in the mm
  1066. switching code so that no page table walks can cross the ASID switch.
  1067. config ARM_ERRATA_754327
  1068. bool "ARM errata: no automatic Store Buffer drain"
  1069. depends on CPU_V7 && SMP
  1070. help
  1071. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1072. r2p0) erratum. The Store Buffer does not have any automatic draining
  1073. mechanism and therefore a livelock may occur if an external agent
  1074. continuously polls a memory location waiting to observe an update.
  1075. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1076. written polling loops from denying visibility of updates to memory.
  1077. config ARM_ERRATA_364296
  1078. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1079. depends on CPU_V6 && !SMP
  1080. help
  1081. This options enables the workaround for the 364296 ARM1136
  1082. r0p2 erratum (possible cache data corruption with
  1083. hit-under-miss enabled). It sets the undocumented bit 31 in
  1084. the auxiliary control register and the FI bit in the control
  1085. register, thus disabling hit-under-miss without putting the
  1086. processor into full low interrupt latency mode. ARM11MPCore
  1087. is not affected.
  1088. config ARM_ERRATA_764369
  1089. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1090. depends on CPU_V7 && SMP
  1091. help
  1092. This option enables the workaround for erratum 764369
  1093. affecting Cortex-A9 MPCore with two or more processors (all
  1094. current revisions). Under certain timing circumstances, a data
  1095. cache line maintenance operation by MVA targeting an Inner
  1096. Shareable memory region may fail to proceed up to either the
  1097. Point of Coherency or to the Point of Unification of the
  1098. system. This workaround adds a DSB instruction before the
  1099. relevant cache maintenance functions and sets a specific bit
  1100. in the diagnostic control register of the SCU.
  1101. config PL310_ERRATA_769419
  1102. bool "PL310 errata: no automatic Store Buffer drain"
  1103. depends on CACHE_L2X0
  1104. help
  1105. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1106. not automatically drain. This can cause normal, non-cacheable
  1107. writes to be retained when the memory system is idle, leading
  1108. to suboptimal I/O performance for drivers using coherent DMA.
  1109. This option adds a write barrier to the cpu_idle loop so that,
  1110. on systems with an outer cache, the store buffer is drained
  1111. explicitly.
  1112. config ARM_ERRATA_775420
  1113. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1114. depends on CPU_V7
  1115. help
  1116. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1117. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1118. operation aborts with MMU exception, it might cause the processor
  1119. to deadlock. This workaround puts DSB before executing ISB if
  1120. an abort may occur on cache maintenance.
  1121. endmenu
  1122. source "arch/arm/common/Kconfig"
  1123. menu "Bus support"
  1124. config ARM_AMBA
  1125. bool
  1126. config ISA
  1127. bool
  1128. help
  1129. Find out whether you have ISA slots on your motherboard. ISA is the
  1130. name of a bus system, i.e. the way the CPU talks to the other stuff
  1131. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1132. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1133. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1134. # Select ISA DMA controller support
  1135. config ISA_DMA
  1136. bool
  1137. select ISA_DMA_API
  1138. # Select ISA DMA interface
  1139. config ISA_DMA_API
  1140. bool
  1141. config PCI
  1142. bool "PCI support" if MIGHT_HAVE_PCI
  1143. help
  1144. Find out whether you have a PCI motherboard. PCI is the name of a
  1145. bus system, i.e. the way the CPU talks to the other stuff inside
  1146. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1147. VESA. If you have PCI, say Y, otherwise N.
  1148. config PCI_DOMAINS
  1149. bool
  1150. depends on PCI
  1151. config PCI_NANOENGINE
  1152. bool "BSE nanoEngine PCI support"
  1153. depends on SA1100_NANOENGINE
  1154. help
  1155. Enable PCI on the BSE nanoEngine board.
  1156. config PCI_SYSCALL
  1157. def_bool PCI
  1158. # Select the host bridge type
  1159. config PCI_HOST_VIA82C505
  1160. bool
  1161. depends on PCI && ARCH_SHARK
  1162. default y
  1163. config PCI_HOST_ITE8152
  1164. bool
  1165. depends on PCI && MACH_ARMCORE
  1166. default y
  1167. select DMABOUNCE
  1168. source "drivers/pci/Kconfig"
  1169. source "drivers/pcmcia/Kconfig"
  1170. endmenu
  1171. menu "Kernel Features"
  1172. config HAVE_SMP
  1173. bool
  1174. help
  1175. This option should be selected by machines which have an SMP-
  1176. capable CPU.
  1177. The only effect of this option is to make the SMP-related
  1178. options available to the user for configuration.
  1179. config SMP
  1180. bool "Symmetric Multi-Processing"
  1181. depends on CPU_V6K || CPU_V7
  1182. depends on GENERIC_CLOCKEVENTS
  1183. depends on HAVE_SMP
  1184. depends on MMU
  1185. select USE_GENERIC_SMP_HELPERS
  1186. help
  1187. This enables support for systems with more than one CPU. If you have
  1188. a system with only one CPU, like most personal computers, say N. If
  1189. you have a system with more than one CPU, say Y.
  1190. If you say N here, the kernel will run on single and multiprocessor
  1191. machines, but will use only one CPU of a multiprocessor machine. If
  1192. you say Y here, the kernel will run on many, but not all, single
  1193. processor machines. On a single processor machine, the kernel will
  1194. run faster if you say N here.
  1195. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1196. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1197. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1198. If you don't know what to do here, say N.
  1199. config SMP_ON_UP
  1200. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1201. depends on SMP && !XIP_KERNEL
  1202. default y
  1203. help
  1204. SMP kernels contain instructions which fail on non-SMP processors.
  1205. Enabling this option allows the kernel to modify itself to make
  1206. these instructions safe. Disabling it allows about 1K of space
  1207. savings.
  1208. If you don't know what to do here, say Y.
  1209. config ARM_CPU_TOPOLOGY
  1210. bool "Support cpu topology definition"
  1211. depends on SMP && CPU_V7
  1212. default y
  1213. help
  1214. Support ARM cpu topology definition. The MPIDR register defines
  1215. affinity between processors which is then used to describe the cpu
  1216. topology of an ARM System.
  1217. config SCHED_MC
  1218. bool "Multi-core scheduler support"
  1219. depends on ARM_CPU_TOPOLOGY
  1220. help
  1221. Multi-core scheduler support improves the CPU scheduler's decision
  1222. making when dealing with multi-core CPU chips at a cost of slightly
  1223. increased overhead in some places. If unsure say N here.
  1224. config SCHED_SMT
  1225. bool "SMT scheduler support"
  1226. depends on ARM_CPU_TOPOLOGY
  1227. help
  1228. Improves the CPU scheduler's decision making when dealing with
  1229. MultiThreading at a cost of slightly increased overhead in some
  1230. places. If unsure say N here.
  1231. config HAVE_ARM_SCU
  1232. bool
  1233. help
  1234. This option enables support for the ARM system coherency unit
  1235. config HAVE_ARM_ARCH_TIMER
  1236. bool "Architected timer support"
  1237. depends on CPU_V7
  1238. select ARM_ARCH_TIMER
  1239. help
  1240. This option enables support for the ARM architected timer
  1241. config HAVE_ARM_TWD
  1242. bool
  1243. depends on SMP
  1244. select CLKSRC_OF if OF
  1245. help
  1246. This options enables support for the ARM timer and watchdog unit
  1247. choice
  1248. prompt "Memory split"
  1249. default VMSPLIT_3G
  1250. help
  1251. Select the desired split between kernel and user memory.
  1252. If you are not absolutely sure what you are doing, leave this
  1253. option alone!
  1254. config VMSPLIT_3G
  1255. bool "3G/1G user/kernel split"
  1256. config VMSPLIT_2G
  1257. bool "2G/2G user/kernel split"
  1258. config VMSPLIT_1G
  1259. bool "1G/3G user/kernel split"
  1260. endchoice
  1261. config PAGE_OFFSET
  1262. hex
  1263. default 0x40000000 if VMSPLIT_1G
  1264. default 0x80000000 if VMSPLIT_2G
  1265. default 0xC0000000
  1266. config NR_CPUS
  1267. int "Maximum number of CPUs (2-32)"
  1268. range 2 32
  1269. depends on SMP
  1270. default "4"
  1271. config HOTPLUG_CPU
  1272. bool "Support for hot-pluggable CPUs"
  1273. depends on SMP && HOTPLUG
  1274. help
  1275. Say Y here to experiment with turning CPUs off and on. CPUs
  1276. can be controlled through /sys/devices/system/cpu.
  1277. config ARM_PSCI
  1278. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1279. depends on CPU_V7
  1280. help
  1281. Say Y here if you want Linux to communicate with system firmware
  1282. implementing the PSCI specification for CPU-centric power
  1283. management operations described in ARM document number ARM DEN
  1284. 0022A ("Power State Coordination Interface System Software on
  1285. ARM processors").
  1286. config LOCAL_TIMERS
  1287. bool "Use local timer interrupts"
  1288. depends on SMP
  1289. default y
  1290. help
  1291. Enable support for local timers on SMP platforms, rather then the
  1292. legacy IPI broadcast method. Local timers allows the system
  1293. accounting to be spread across the timer interval, preventing a
  1294. "thundering herd" at every timer tick.
  1295. # The GPIO number here must be sorted by descending number. In case of
  1296. # a multiplatform kernel, we just want the highest value required by the
  1297. # selected platforms.
  1298. config ARCH_NR_GPIO
  1299. int
  1300. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1301. default 512 if SOC_OMAP5
  1302. default 355 if ARCH_U8500
  1303. default 288 if ARCH_VT8500 || ARCH_SUNXI
  1304. default 264 if MACH_H4700
  1305. default 0
  1306. help
  1307. Maximum number of GPIOs in the system.
  1308. If unsure, leave the default value.
  1309. source kernel/Kconfig.preempt
  1310. config HZ
  1311. int
  1312. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1313. ARCH_S5PV210 || ARCH_EXYNOS4
  1314. default AT91_TIMER_HZ if ARCH_AT91
  1315. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1316. default 100
  1317. config SCHED_HRTICK
  1318. def_bool HIGH_RES_TIMERS
  1319. config THUMB2_KERNEL
  1320. bool "Compile the kernel in Thumb-2 mode"
  1321. depends on CPU_V7 && !CPU_V6 && !CPU_V6K
  1322. select AEABI
  1323. select ARM_ASM_UNIFIED
  1324. select ARM_UNWIND
  1325. help
  1326. By enabling this option, the kernel will be compiled in
  1327. Thumb-2 mode. A compiler/assembler that understand the unified
  1328. ARM-Thumb syntax is needed.
  1329. If unsure, say N.
  1330. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1331. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1332. depends on THUMB2_KERNEL && MODULES
  1333. default y
  1334. help
  1335. Various binutils versions can resolve Thumb-2 branches to
  1336. locally-defined, preemptible global symbols as short-range "b.n"
  1337. branch instructions.
  1338. This is a problem, because there's no guarantee the final
  1339. destination of the symbol, or any candidate locations for a
  1340. trampoline, are within range of the branch. For this reason, the
  1341. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1342. relocation in modules at all, and it makes little sense to add
  1343. support.
  1344. The symptom is that the kernel fails with an "unsupported
  1345. relocation" error when loading some modules.
  1346. Until fixed tools are available, passing
  1347. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1348. code which hits this problem, at the cost of a bit of extra runtime
  1349. stack usage in some cases.
  1350. The problem is described in more detail at:
  1351. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1352. Only Thumb-2 kernels are affected.
  1353. Unless you are sure your tools don't have this problem, say Y.
  1354. config ARM_ASM_UNIFIED
  1355. bool
  1356. config AEABI
  1357. bool "Use the ARM EABI to compile the kernel"
  1358. help
  1359. This option allows for the kernel to be compiled using the latest
  1360. ARM ABI (aka EABI). This is only useful if you are using a user
  1361. space environment that is also compiled with EABI.
  1362. Since there are major incompatibilities between the legacy ABI and
  1363. EABI, especially with regard to structure member alignment, this
  1364. option also changes the kernel syscall calling convention to
  1365. disambiguate both ABIs and allow for backward compatibility support
  1366. (selected with CONFIG_OABI_COMPAT).
  1367. To use this you need GCC version 4.0.0 or later.
  1368. config OABI_COMPAT
  1369. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1370. depends on AEABI && !THUMB2_KERNEL
  1371. default y
  1372. help
  1373. This option preserves the old syscall interface along with the
  1374. new (ARM EABI) one. It also provides a compatibility layer to
  1375. intercept syscalls that have structure arguments which layout
  1376. in memory differs between the legacy ABI and the new ARM EABI
  1377. (only for non "thumb" binaries). This option adds a tiny
  1378. overhead to all syscalls and produces a slightly larger kernel.
  1379. If you know you'll be using only pure EABI user space then you
  1380. can say N here. If this option is not selected and you attempt
  1381. to execute a legacy ABI binary then the result will be
  1382. UNPREDICTABLE (in fact it can be predicted that it won't work
  1383. at all). If in doubt say Y.
  1384. config ARCH_HAS_HOLES_MEMORYMODEL
  1385. bool
  1386. config ARCH_SPARSEMEM_ENABLE
  1387. bool
  1388. config ARCH_SPARSEMEM_DEFAULT
  1389. def_bool ARCH_SPARSEMEM_ENABLE
  1390. config ARCH_SELECT_MEMORY_MODEL
  1391. def_bool ARCH_SPARSEMEM_ENABLE
  1392. config HAVE_ARCH_PFN_VALID
  1393. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1394. config HIGHMEM
  1395. bool "High Memory Support"
  1396. depends on MMU
  1397. help
  1398. The address space of ARM processors is only 4 Gigabytes large
  1399. and it has to accommodate user address space, kernel address
  1400. space as well as some memory mapped IO. That means that, if you
  1401. have a large amount of physical memory and/or IO, not all of the
  1402. memory can be "permanently mapped" by the kernel. The physical
  1403. memory that is not permanently mapped is called "high memory".
  1404. Depending on the selected kernel/user memory split, minimum
  1405. vmalloc space and actual amount of RAM, you may not need this
  1406. option which should result in a slightly faster kernel.
  1407. If unsure, say n.
  1408. config HIGHPTE
  1409. bool "Allocate 2nd-level pagetables from highmem"
  1410. depends on HIGHMEM
  1411. config HW_PERF_EVENTS
  1412. bool "Enable hardware performance counter support for perf events"
  1413. depends on PERF_EVENTS
  1414. default y
  1415. help
  1416. Enable hardware performance counter support for perf events. If
  1417. disabled, perf events will use software events only.
  1418. source "mm/Kconfig"
  1419. config FORCE_MAX_ZONEORDER
  1420. int "Maximum zone order" if ARCH_SHMOBILE
  1421. range 11 64 if ARCH_SHMOBILE
  1422. default "12" if SOC_AM33XX
  1423. default "9" if SA1111
  1424. default "11"
  1425. help
  1426. The kernel memory allocator divides physically contiguous memory
  1427. blocks into "zones", where each zone is a power of two number of
  1428. pages. This option selects the largest power of two that the kernel
  1429. keeps in the memory allocator. If you need to allocate very large
  1430. blocks of physically contiguous memory, then you may need to
  1431. increase this value.
  1432. This config option is actually maximum order plus one. For example,
  1433. a value of 11 means that the largest free memory block is 2^10 pages.
  1434. config ALIGNMENT_TRAP
  1435. bool
  1436. depends on CPU_CP15_MMU
  1437. default y if !ARCH_EBSA110
  1438. select HAVE_PROC_CPU if PROC_FS
  1439. help
  1440. ARM processors cannot fetch/store information which is not
  1441. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1442. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1443. fetch/store instructions will be emulated in software if you say
  1444. here, which has a severe performance impact. This is necessary for
  1445. correct operation of some network protocols. With an IP-only
  1446. configuration it is safe to say N, otherwise say Y.
  1447. config UACCESS_WITH_MEMCPY
  1448. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1449. depends on MMU
  1450. default y if CPU_FEROCEON
  1451. help
  1452. Implement faster copy_to_user and clear_user methods for CPU
  1453. cores where a 8-word STM instruction give significantly higher
  1454. memory write throughput than a sequence of individual 32bit stores.
  1455. A possible side effect is a slight increase in scheduling latency
  1456. between threads sharing the same address space if they invoke
  1457. such copy operations with large buffers.
  1458. However, if the CPU data cache is using a write-allocate mode,
  1459. this option is unlikely to provide any performance gain.
  1460. config SECCOMP
  1461. bool
  1462. prompt "Enable seccomp to safely compute untrusted bytecode"
  1463. ---help---
  1464. This kernel feature is useful for number crunching applications
  1465. that may need to compute untrusted bytecode during their
  1466. execution. By using pipes or other transports made available to
  1467. the process as file descriptors supporting the read/write
  1468. syscalls, it's possible to isolate those applications in
  1469. their own address space using seccomp. Once seccomp is
  1470. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1471. and the task is only allowed to execute a few safe syscalls
  1472. defined by each seccomp mode.
  1473. config CC_STACKPROTECTOR
  1474. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1475. help
  1476. This option turns on the -fstack-protector GCC feature. This
  1477. feature puts, at the beginning of functions, a canary value on
  1478. the stack just before the return address, and validates
  1479. the value just before actually returning. Stack based buffer
  1480. overflows (that need to overwrite this return address) now also
  1481. overwrite the canary, which gets detected and the attack is then
  1482. neutralized via a kernel panic.
  1483. This feature requires gcc version 4.2 or above.
  1484. config XEN_DOM0
  1485. def_bool y
  1486. depends on XEN
  1487. config XEN
  1488. bool "Xen guest support on ARM (EXPERIMENTAL)"
  1489. depends on ARM && AEABI && OF
  1490. depends on CPU_V7 && !CPU_V6
  1491. depends on !GENERIC_ATOMIC64
  1492. help
  1493. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1494. endmenu
  1495. menu "Boot options"
  1496. config USE_OF
  1497. bool "Flattened Device Tree support"
  1498. select IRQ_DOMAIN
  1499. select OF
  1500. select OF_EARLY_FLATTREE
  1501. help
  1502. Include support for flattened device tree machine descriptions.
  1503. config ATAGS
  1504. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1505. default y
  1506. help
  1507. This is the traditional way of passing data to the kernel at boot
  1508. time. If you are solely relying on the flattened device tree (or
  1509. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1510. to remove ATAGS support from your kernel binary. If unsure,
  1511. leave this to y.
  1512. config DEPRECATED_PARAM_STRUCT
  1513. bool "Provide old way to pass kernel parameters"
  1514. depends on ATAGS
  1515. help
  1516. This was deprecated in 2001 and announced to live on for 5 years.
  1517. Some old boot loaders still use this way.
  1518. # Compressed boot loader in ROM. Yes, we really want to ask about
  1519. # TEXT and BSS so we preserve their values in the config files.
  1520. config ZBOOT_ROM_TEXT
  1521. hex "Compressed ROM boot loader base address"
  1522. default "0"
  1523. help
  1524. The physical address at which the ROM-able zImage is to be
  1525. placed in the target. Platforms which normally make use of
  1526. ROM-able zImage formats normally set this to a suitable
  1527. value in their defconfig file.
  1528. If ZBOOT_ROM is not enabled, this has no effect.
  1529. config ZBOOT_ROM_BSS
  1530. hex "Compressed ROM boot loader BSS address"
  1531. default "0"
  1532. help
  1533. The base address of an area of read/write memory in the target
  1534. for the ROM-able zImage which must be available while the
  1535. decompressor is running. It must be large enough to hold the
  1536. entire decompressed kernel plus an additional 128 KiB.
  1537. Platforms which normally make use of ROM-able zImage formats
  1538. normally set this to a suitable value in their defconfig file.
  1539. If ZBOOT_ROM is not enabled, this has no effect.
  1540. config ZBOOT_ROM
  1541. bool "Compressed boot loader in ROM/flash"
  1542. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1543. help
  1544. Say Y here if you intend to execute your compressed kernel image
  1545. (zImage) directly from ROM or flash. If unsure, say N.
  1546. choice
  1547. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1548. depends on ZBOOT_ROM && ARCH_SH7372
  1549. default ZBOOT_ROM_NONE
  1550. help
  1551. Include experimental SD/MMC loading code in the ROM-able zImage.
  1552. With this enabled it is possible to write the ROM-able zImage
  1553. kernel image to an MMC or SD card and boot the kernel straight
  1554. from the reset vector. At reset the processor Mask ROM will load
  1555. the first part of the ROM-able zImage which in turn loads the
  1556. rest the kernel image to RAM.
  1557. config ZBOOT_ROM_NONE
  1558. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1559. help
  1560. Do not load image from SD or MMC
  1561. config ZBOOT_ROM_MMCIF
  1562. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1563. help
  1564. Load image from MMCIF hardware block.
  1565. config ZBOOT_ROM_SH_MOBILE_SDHI
  1566. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1567. help
  1568. Load image from SDHI hardware block
  1569. endchoice
  1570. config ARM_APPENDED_DTB
  1571. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1572. depends on OF && !ZBOOT_ROM
  1573. help
  1574. With this option, the boot code will look for a device tree binary
  1575. (DTB) appended to zImage
  1576. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1577. This is meant as a backward compatibility convenience for those
  1578. systems with a bootloader that can't be upgraded to accommodate
  1579. the documented boot protocol using a device tree.
  1580. Beware that there is very little in terms of protection against
  1581. this option being confused by leftover garbage in memory that might
  1582. look like a DTB header after a reboot if no actual DTB is appended
  1583. to zImage. Do not leave this option active in a production kernel
  1584. if you don't intend to always append a DTB. Proper passing of the
  1585. location into r2 of a bootloader provided DTB is always preferable
  1586. to this option.
  1587. config ARM_ATAG_DTB_COMPAT
  1588. bool "Supplement the appended DTB with traditional ATAG information"
  1589. depends on ARM_APPENDED_DTB
  1590. help
  1591. Some old bootloaders can't be updated to a DTB capable one, yet
  1592. they provide ATAGs with memory configuration, the ramdisk address,
  1593. the kernel cmdline string, etc. Such information is dynamically
  1594. provided by the bootloader and can't always be stored in a static
  1595. DTB. To allow a device tree enabled kernel to be used with such
  1596. bootloaders, this option allows zImage to extract the information
  1597. from the ATAG list and store it at run time into the appended DTB.
  1598. choice
  1599. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1600. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1601. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1602. bool "Use bootloader kernel arguments if available"
  1603. help
  1604. Uses the command-line options passed by the boot loader instead of
  1605. the device tree bootargs property. If the boot loader doesn't provide
  1606. any, the device tree bootargs property will be used.
  1607. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1608. bool "Extend with bootloader kernel arguments"
  1609. help
  1610. The command-line arguments provided by the boot loader will be
  1611. appended to the the device tree bootargs property.
  1612. endchoice
  1613. config CMDLINE
  1614. string "Default kernel command string"
  1615. default ""
  1616. help
  1617. On some architectures (EBSA110 and CATS), there is currently no way
  1618. for the boot loader to pass arguments to the kernel. For these
  1619. architectures, you should supply some command-line options at build
  1620. time by entering them here. As a minimum, you should specify the
  1621. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1622. choice
  1623. prompt "Kernel command line type" if CMDLINE != ""
  1624. default CMDLINE_FROM_BOOTLOADER
  1625. depends on ATAGS
  1626. config CMDLINE_FROM_BOOTLOADER
  1627. bool "Use bootloader kernel arguments if available"
  1628. help
  1629. Uses the command-line options passed by the boot loader. If
  1630. the boot loader doesn't provide any, the default kernel command
  1631. string provided in CMDLINE will be used.
  1632. config CMDLINE_EXTEND
  1633. bool "Extend bootloader kernel arguments"
  1634. help
  1635. The command-line arguments provided by the boot loader will be
  1636. appended to the default kernel command string.
  1637. config CMDLINE_FORCE
  1638. bool "Always use the default kernel command string"
  1639. help
  1640. Always use the default kernel command string, even if the boot
  1641. loader passes other arguments to the kernel.
  1642. This is useful if you cannot or don't want to change the
  1643. command-line options your boot loader passes to the kernel.
  1644. endchoice
  1645. config XIP_KERNEL
  1646. bool "Kernel Execute-In-Place from ROM"
  1647. depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
  1648. help
  1649. Execute-In-Place allows the kernel to run from non-volatile storage
  1650. directly addressable by the CPU, such as NOR flash. This saves RAM
  1651. space since the text section of the kernel is not loaded from flash
  1652. to RAM. Read-write sections, such as the data section and stack,
  1653. are still copied to RAM. The XIP kernel is not compressed since
  1654. it has to run directly from flash, so it will take more space to
  1655. store it. The flash address used to link the kernel object files,
  1656. and for storing it, is configuration dependent. Therefore, if you
  1657. say Y here, you must know the proper physical address where to
  1658. store the kernel image depending on your own flash memory usage.
  1659. Also note that the make target becomes "make xipImage" rather than
  1660. "make zImage" or "make Image". The final kernel binary to put in
  1661. ROM memory will be arch/arm/boot/xipImage.
  1662. If unsure, say N.
  1663. config XIP_PHYS_ADDR
  1664. hex "XIP Kernel Physical Location"
  1665. depends on XIP_KERNEL
  1666. default "0x00080000"
  1667. help
  1668. This is the physical address in your flash memory the kernel will
  1669. be linked for and stored to. This address is dependent on your
  1670. own flash usage.
  1671. config KEXEC
  1672. bool "Kexec system call (EXPERIMENTAL)"
  1673. depends on (!SMP || HOTPLUG_CPU)
  1674. help
  1675. kexec is a system call that implements the ability to shutdown your
  1676. current kernel, and to start another kernel. It is like a reboot
  1677. but it is independent of the system firmware. And like a reboot
  1678. you can start any kernel with it, not just Linux.
  1679. It is an ongoing process to be certain the hardware in a machine
  1680. is properly shutdown, so do not be surprised if this code does not
  1681. initially work for you. It may help to enable device hotplugging
  1682. support.
  1683. config ATAGS_PROC
  1684. bool "Export atags in procfs"
  1685. depends on ATAGS && KEXEC
  1686. default y
  1687. help
  1688. Should the atags used to boot the kernel be exported in an "atags"
  1689. file in procfs. Useful with kexec.
  1690. config CRASH_DUMP
  1691. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1692. help
  1693. Generate crash dump after being started by kexec. This should
  1694. be normally only set in special crash dump kernels which are
  1695. loaded in the main kernel with kexec-tools into a specially
  1696. reserved region and then later executed after a crash by
  1697. kdump/kexec. The crash dump kernel must be compiled to a
  1698. memory address not used by the main kernel
  1699. For more details see Documentation/kdump/kdump.txt
  1700. config AUTO_ZRELADDR
  1701. bool "Auto calculation of the decompressed kernel image address"
  1702. depends on !ZBOOT_ROM && !ARCH_U300
  1703. help
  1704. ZRELADDR is the physical address where the decompressed kernel
  1705. image will be placed. If AUTO_ZRELADDR is selected, the address
  1706. will be determined at run-time by masking the current IP with
  1707. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1708. from start of memory.
  1709. endmenu
  1710. menu "CPU Power Management"
  1711. if ARCH_HAS_CPUFREQ
  1712. source "drivers/cpufreq/Kconfig"
  1713. config CPU_FREQ_IMX
  1714. tristate "CPUfreq driver for i.MX CPUs"
  1715. depends on ARCH_MXC && CPU_FREQ
  1716. select CPU_FREQ_TABLE
  1717. help
  1718. This enables the CPUfreq driver for i.MX CPUs.
  1719. config CPU_FREQ_SA1100
  1720. bool
  1721. config CPU_FREQ_SA1110
  1722. bool
  1723. config CPU_FREQ_INTEGRATOR
  1724. tristate "CPUfreq driver for ARM Integrator CPUs"
  1725. depends on ARCH_INTEGRATOR && CPU_FREQ
  1726. default y
  1727. help
  1728. This enables the CPUfreq driver for ARM Integrator CPUs.
  1729. For details, take a look at <file:Documentation/cpu-freq>.
  1730. If in doubt, say Y.
  1731. config CPU_FREQ_PXA
  1732. bool
  1733. depends on CPU_FREQ && ARCH_PXA && PXA25x
  1734. default y
  1735. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  1736. select CPU_FREQ_TABLE
  1737. config CPU_FREQ_S3C
  1738. bool
  1739. help
  1740. Internal configuration node for common cpufreq on Samsung SoC
  1741. config CPU_FREQ_S3C24XX
  1742. bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
  1743. depends on ARCH_S3C24XX && CPU_FREQ
  1744. select CPU_FREQ_S3C
  1745. help
  1746. This enables the CPUfreq driver for the Samsung S3C24XX family
  1747. of CPUs.
  1748. For details, take a look at <file:Documentation/cpu-freq>.
  1749. If in doubt, say N.
  1750. config CPU_FREQ_S3C24XX_PLL
  1751. bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
  1752. depends on CPU_FREQ_S3C24XX
  1753. help
  1754. Compile in support for changing the PLL frequency from the
  1755. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1756. after a frequency change, so by default it is not enabled.
  1757. This also means that the PLL tables for the selected CPU(s) will
  1758. be built which may increase the size of the kernel image.
  1759. config CPU_FREQ_S3C24XX_DEBUG
  1760. bool "Debug CPUfreq Samsung driver core"
  1761. depends on CPU_FREQ_S3C24XX
  1762. help
  1763. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1764. config CPU_FREQ_S3C24XX_IODEBUG
  1765. bool "Debug CPUfreq Samsung driver IO timing"
  1766. depends on CPU_FREQ_S3C24XX
  1767. help
  1768. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1769. config CPU_FREQ_S3C24XX_DEBUGFS
  1770. bool "Export debugfs for CPUFreq"
  1771. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1772. help
  1773. Export status information via debugfs.
  1774. endif
  1775. source "drivers/cpuidle/Kconfig"
  1776. endmenu
  1777. menu "Floating point emulation"
  1778. comment "At least one emulation must be selected"
  1779. config FPE_NWFPE
  1780. bool "NWFPE math emulation"
  1781. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1782. ---help---
  1783. Say Y to include the NWFPE floating point emulator in the kernel.
  1784. This is necessary to run most binaries. Linux does not currently
  1785. support floating point hardware so you need to say Y here even if
  1786. your machine has an FPA or floating point co-processor podule.
  1787. You may say N here if you are going to load the Acorn FPEmulator
  1788. early in the bootup.
  1789. config FPE_NWFPE_XP
  1790. bool "Support extended precision"
  1791. depends on FPE_NWFPE
  1792. help
  1793. Say Y to include 80-bit support in the kernel floating-point
  1794. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1795. Note that gcc does not generate 80-bit operations by default,
  1796. so in most cases this option only enlarges the size of the
  1797. floating point emulator without any good reason.
  1798. You almost surely want to say N here.
  1799. config FPE_FASTFPE
  1800. bool "FastFPE math emulation (EXPERIMENTAL)"
  1801. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1802. ---help---
  1803. Say Y here to include the FAST floating point emulator in the kernel.
  1804. This is an experimental much faster emulator which now also has full
  1805. precision for the mantissa. It does not support any exceptions.
  1806. It is very simple, and approximately 3-6 times faster than NWFPE.
  1807. It should be sufficient for most programs. It may be not suitable
  1808. for scientific calculations, but you have to check this for yourself.
  1809. If you do not feel you need a faster FP emulation you should better
  1810. choose NWFPE.
  1811. config VFP
  1812. bool "VFP-format floating point maths"
  1813. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1814. help
  1815. Say Y to include VFP support code in the kernel. This is needed
  1816. if your hardware includes a VFP unit.
  1817. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1818. release notes and additional status information.
  1819. Say N if your target does not have VFP hardware.
  1820. config VFPv3
  1821. bool
  1822. depends on VFP
  1823. default y if CPU_V7
  1824. config NEON
  1825. bool "Advanced SIMD (NEON) Extension support"
  1826. depends on VFPv3 && CPU_V7
  1827. help
  1828. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1829. Extension.
  1830. endmenu
  1831. menu "Userspace binary formats"
  1832. source "fs/Kconfig.binfmt"
  1833. config ARTHUR
  1834. tristate "RISC OS personality"
  1835. depends on !AEABI
  1836. help
  1837. Say Y here to include the kernel code necessary if you want to run
  1838. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1839. experimental; if this sounds frightening, say N and sleep in peace.
  1840. You can also say M here to compile this support as a module (which
  1841. will be called arthur).
  1842. endmenu
  1843. menu "Power management options"
  1844. source "kernel/power/Kconfig"
  1845. config ARCH_SUSPEND_POSSIBLE
  1846. depends on !ARCH_S5PC100
  1847. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1848. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1849. def_bool y
  1850. config ARM_CPU_SUSPEND
  1851. def_bool PM_SLEEP
  1852. endmenu
  1853. source "net/Kconfig"
  1854. source "drivers/Kconfig"
  1855. source "fs/Kconfig"
  1856. source "arch/arm/Kconfig.debug"
  1857. source "security/Kconfig"
  1858. source "crypto/Kconfig"
  1859. source "lib/Kconfig"
  1860. source "arch/arm/kvm/Kconfig"