Kconfig 66 KB

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  1. config ARM
  2. bool
  3. default y
  4. select ARCH_HAVE_CUSTOM_GPIO_H
  5. select HAVE_AOUT
  6. select HAVE_DMA_API_DEBUG
  7. select HAVE_IDE if PCI || ISA || PCMCIA
  8. select HAVE_DMA_ATTRS
  9. select HAVE_DMA_CONTIGUOUS if (CPU_V6 || CPU_V6K || CPU_V7)
  10. select HAVE_MEMBLOCK
  11. select RTC_LIB
  12. select SYS_SUPPORTS_APM_EMULATION
  13. select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
  14. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  15. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  16. select HAVE_ARCH_KGDB
  17. select HAVE_ARCH_TRACEHOOK
  18. select HAVE_KPROBES if !XIP_KERNEL
  19. select HAVE_KRETPROBES if (HAVE_KPROBES)
  20. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  21. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  22. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  23. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  24. select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  25. select HAVE_GENERIC_DMA_COHERENT
  26. select HAVE_KERNEL_GZIP
  27. select HAVE_KERNEL_LZO
  28. select HAVE_KERNEL_LZMA
  29. select HAVE_KERNEL_XZ
  30. select HAVE_IRQ_WORK
  31. select HAVE_PERF_EVENTS
  32. select PERF_USE_VMALLOC
  33. select HAVE_REGS_AND_STACK_ACCESS_API
  34. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  35. select HAVE_C_RECORDMCOUNT
  36. select HAVE_GENERIC_HARDIRQS
  37. select HARDIRQS_SW_RESEND
  38. select GENERIC_IRQ_PROBE
  39. select GENERIC_IRQ_SHOW
  40. select GENERIC_IRQ_PROBE
  41. select HARDIRQS_SW_RESEND
  42. select CPU_PM if (SUSPEND || CPU_IDLE)
  43. select GENERIC_PCI_IOMAP
  44. select HAVE_BPF_JIT
  45. select GENERIC_SMP_IDLE_THREAD
  46. select KTIME_SCALAR
  47. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  48. select GENERIC_STRNCPY_FROM_USER
  49. select GENERIC_STRNLEN_USER
  50. select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN
  51. help
  52. The ARM series is a line of low-power-consumption RISC chip designs
  53. licensed by ARM Ltd and targeted at embedded applications and
  54. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  55. manufactured, but legacy ARM-based PC hardware remains popular in
  56. Europe. There is an ARM Linux project with a web page at
  57. <http://www.arm.linux.org.uk/>.
  58. config ARM_HAS_SG_CHAIN
  59. bool
  60. config NEED_SG_DMA_LENGTH
  61. bool
  62. config ARM_DMA_USE_IOMMU
  63. select NEED_SG_DMA_LENGTH
  64. select ARM_HAS_SG_CHAIN
  65. bool
  66. config HAVE_PWM
  67. bool
  68. config MIGHT_HAVE_PCI
  69. bool
  70. config SYS_SUPPORTS_APM_EMULATION
  71. bool
  72. config GENERIC_GPIO
  73. bool
  74. config HAVE_TCM
  75. bool
  76. select GENERIC_ALLOCATOR
  77. config HAVE_PROC_CPU
  78. bool
  79. config NO_IOPORT
  80. bool
  81. config EISA
  82. bool
  83. ---help---
  84. The Extended Industry Standard Architecture (EISA) bus was
  85. developed as an open alternative to the IBM MicroChannel bus.
  86. The EISA bus provided some of the features of the IBM MicroChannel
  87. bus while maintaining backward compatibility with cards made for
  88. the older ISA bus. The EISA bus saw limited use between 1988 and
  89. 1995 when it was made obsolete by the PCI bus.
  90. Say Y here if you are building a kernel for an EISA-based machine.
  91. Otherwise, say N.
  92. config SBUS
  93. bool
  94. config STACKTRACE_SUPPORT
  95. bool
  96. default y
  97. config HAVE_LATENCYTOP_SUPPORT
  98. bool
  99. depends on !SMP
  100. default y
  101. config LOCKDEP_SUPPORT
  102. bool
  103. default y
  104. config TRACE_IRQFLAGS_SUPPORT
  105. bool
  106. default y
  107. config GENERIC_LOCKBREAK
  108. bool
  109. default y
  110. depends on SMP && PREEMPT
  111. config RWSEM_GENERIC_SPINLOCK
  112. bool
  113. default y
  114. config RWSEM_XCHGADD_ALGORITHM
  115. bool
  116. config ARCH_HAS_ILOG2_U32
  117. bool
  118. config ARCH_HAS_ILOG2_U64
  119. bool
  120. config ARCH_HAS_CPUFREQ
  121. bool
  122. help
  123. Internal node to signify that the ARCH has CPUFREQ support
  124. and that the relevant menu configurations are displayed for
  125. it.
  126. config GENERIC_HWEIGHT
  127. bool
  128. default y
  129. config GENERIC_CALIBRATE_DELAY
  130. bool
  131. default y
  132. config ARCH_MAY_HAVE_PC_FDC
  133. bool
  134. config ZONE_DMA
  135. bool
  136. config NEED_DMA_MAP_STATE
  137. def_bool y
  138. config ARCH_HAS_DMA_SET_COHERENT_MASK
  139. bool
  140. config GENERIC_ISA_DMA
  141. bool
  142. config FIQ
  143. bool
  144. config NEED_RET_TO_USER
  145. bool
  146. config ARCH_MTD_XIP
  147. bool
  148. config VECTORS_BASE
  149. hex
  150. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  151. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  152. default 0x00000000
  153. help
  154. The base address of exception vectors.
  155. config ARM_PATCH_PHYS_VIRT
  156. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  157. default y
  158. depends on !XIP_KERNEL && MMU
  159. depends on !ARCH_REALVIEW || !SPARSEMEM
  160. help
  161. Patch phys-to-virt and virt-to-phys translation functions at
  162. boot and module load time according to the position of the
  163. kernel in system memory.
  164. This can only be used with non-XIP MMU kernels where the base
  165. of physical memory is at a 16MB boundary.
  166. Only disable this option if you know that you do not require
  167. this feature (eg, building a kernel for a single machine) and
  168. you need to shrink the kernel to the minimal size.
  169. config NEED_MACH_IO_H
  170. bool
  171. help
  172. Select this when mach/io.h is required to provide special
  173. definitions for this platform. The need for mach/io.h should
  174. be avoided when possible.
  175. config NEED_MACH_MEMORY_H
  176. bool
  177. help
  178. Select this when mach/memory.h is required to provide special
  179. definitions for this platform. The need for mach/memory.h should
  180. be avoided when possible.
  181. config PHYS_OFFSET
  182. hex "Physical address of main memory" if MMU
  183. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  184. default DRAM_BASE if !MMU
  185. help
  186. Please provide the physical address corresponding to the
  187. location of main memory in your system.
  188. config GENERIC_BUG
  189. def_bool y
  190. depends on BUG
  191. source "init/Kconfig"
  192. source "kernel/Kconfig.freezer"
  193. menu "System Type"
  194. config MMU
  195. bool "MMU-based Paged Memory Management Support"
  196. default y
  197. help
  198. Select if you want MMU-based virtualised addressing space
  199. support by paged memory management. If unsure, say 'Y'.
  200. #
  201. # The "ARM system type" choice list is ordered alphabetically by option
  202. # text. Please add new entries in the option alphabetic order.
  203. #
  204. choice
  205. prompt "ARM system type"
  206. default ARCH_VERSATILE
  207. config ARCH_SOCFPGA
  208. bool "Altera SOCFPGA family"
  209. select ARCH_WANT_OPTIONAL_GPIOLIB
  210. select ARM_AMBA
  211. select ARM_GIC
  212. select CACHE_L2X0
  213. select CLKDEV_LOOKUP
  214. select COMMON_CLK
  215. select CPU_V7
  216. select DW_APB_TIMER
  217. select DW_APB_TIMER_OF
  218. select GENERIC_CLOCKEVENTS
  219. select GPIO_PL061 if GPIOLIB
  220. select HAVE_ARM_SCU
  221. select SPARSE_IRQ
  222. select USE_OF
  223. help
  224. This enables support for Altera SOCFPGA Cyclone V platform
  225. config ARCH_INTEGRATOR
  226. bool "ARM Ltd. Integrator family"
  227. select ARM_AMBA
  228. select ARCH_HAS_CPUFREQ
  229. select COMMON_CLK
  230. select CLK_VERSATILE
  231. select HAVE_TCM
  232. select ICST
  233. select GENERIC_CLOCKEVENTS
  234. select PLAT_VERSATILE
  235. select PLAT_VERSATILE_FPGA_IRQ
  236. select NEED_MACH_IO_H
  237. select NEED_MACH_MEMORY_H
  238. select SPARSE_IRQ
  239. select MULTI_IRQ_HANDLER
  240. help
  241. Support for ARM's Integrator platform.
  242. config ARCH_REALVIEW
  243. bool "ARM Ltd. RealView family"
  244. select ARM_AMBA
  245. select CLKDEV_LOOKUP
  246. select HAVE_MACH_CLKDEV
  247. select ICST
  248. select GENERIC_CLOCKEVENTS
  249. select ARCH_WANT_OPTIONAL_GPIOLIB
  250. select PLAT_VERSATILE
  251. select PLAT_VERSATILE_CLOCK
  252. select PLAT_VERSATILE_CLCD
  253. select ARM_TIMER_SP804
  254. select GPIO_PL061 if GPIOLIB
  255. select NEED_MACH_MEMORY_H
  256. help
  257. This enables support for ARM Ltd RealView boards.
  258. config ARCH_VERSATILE
  259. bool "ARM Ltd. Versatile family"
  260. select ARM_AMBA
  261. select ARM_VIC
  262. select CLKDEV_LOOKUP
  263. select HAVE_MACH_CLKDEV
  264. select ICST
  265. select GENERIC_CLOCKEVENTS
  266. select ARCH_WANT_OPTIONAL_GPIOLIB
  267. select NEED_MACH_IO_H if PCI
  268. select PLAT_VERSATILE
  269. select PLAT_VERSATILE_CLOCK
  270. select PLAT_VERSATILE_CLCD
  271. select PLAT_VERSATILE_FPGA_IRQ
  272. select ARM_TIMER_SP804
  273. help
  274. This enables support for ARM Ltd Versatile board.
  275. config ARCH_VEXPRESS
  276. bool "ARM Ltd. Versatile Express family"
  277. select ARCH_WANT_OPTIONAL_GPIOLIB
  278. select ARM_AMBA
  279. select ARM_TIMER_SP804
  280. select CLKDEV_LOOKUP
  281. select COMMON_CLK
  282. select GENERIC_CLOCKEVENTS
  283. select HAVE_CLK
  284. select HAVE_PATA_PLATFORM
  285. select ICST
  286. select NO_IOPORT
  287. select PLAT_VERSATILE
  288. select PLAT_VERSATILE_CLCD
  289. select REGULATOR_FIXED_VOLTAGE if REGULATOR
  290. help
  291. This enables support for the ARM Ltd Versatile Express boards.
  292. config ARCH_AT91
  293. bool "Atmel AT91"
  294. select ARCH_REQUIRE_GPIOLIB
  295. select HAVE_CLK
  296. select CLKDEV_LOOKUP
  297. select IRQ_DOMAIN
  298. select NEED_MACH_IO_H if PCCARD
  299. help
  300. This enables support for systems based on Atmel
  301. AT91RM9200 and AT91SAM9* processors.
  302. config ARCH_BCMRING
  303. bool "Broadcom BCMRING"
  304. depends on MMU
  305. select CPU_V6
  306. select ARM_AMBA
  307. select ARM_TIMER_SP804
  308. select CLKDEV_LOOKUP
  309. select GENERIC_CLOCKEVENTS
  310. select ARCH_WANT_OPTIONAL_GPIOLIB
  311. help
  312. Support for Broadcom's BCMRing platform.
  313. config ARCH_HIGHBANK
  314. bool "Calxeda Highbank-based"
  315. select ARCH_WANT_OPTIONAL_GPIOLIB
  316. select ARM_AMBA
  317. select ARM_GIC
  318. select ARM_TIMER_SP804
  319. select CACHE_L2X0
  320. select CLKDEV_LOOKUP
  321. select COMMON_CLK
  322. select CPU_V7
  323. select GENERIC_CLOCKEVENTS
  324. select HAVE_ARM_SCU
  325. select HAVE_SMP
  326. select SPARSE_IRQ
  327. select USE_OF
  328. help
  329. Support for the Calxeda Highbank SoC based boards.
  330. config ARCH_CLPS711X
  331. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  332. select CPU_ARM720T
  333. select ARCH_USES_GETTIMEOFFSET
  334. select NEED_MACH_MEMORY_H
  335. help
  336. Support for Cirrus Logic 711x/721x/731x based boards.
  337. config ARCH_CNS3XXX
  338. bool "Cavium Networks CNS3XXX family"
  339. select CPU_V6K
  340. select GENERIC_CLOCKEVENTS
  341. select ARM_GIC
  342. select MIGHT_HAVE_CACHE_L2X0
  343. select MIGHT_HAVE_PCI
  344. select PCI_DOMAINS if PCI
  345. help
  346. Support for Cavium Networks CNS3XXX platform.
  347. config ARCH_GEMINI
  348. bool "Cortina Systems Gemini"
  349. select CPU_FA526
  350. select ARCH_REQUIRE_GPIOLIB
  351. select ARCH_USES_GETTIMEOFFSET
  352. help
  353. Support for the Cortina Systems Gemini family SoCs
  354. config ARCH_PRIMA2
  355. bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
  356. select CPU_V7
  357. select NO_IOPORT
  358. select ARCH_REQUIRE_GPIOLIB
  359. select GENERIC_CLOCKEVENTS
  360. select CLKDEV_LOOKUP
  361. select GENERIC_IRQ_CHIP
  362. select MIGHT_HAVE_CACHE_L2X0
  363. select PINCTRL
  364. select PINCTRL_SIRF
  365. select USE_OF
  366. select ZONE_DMA
  367. help
  368. Support for CSR SiRFSoC ARM Cortex A9 Platform
  369. config ARCH_EBSA110
  370. bool "EBSA-110"
  371. select CPU_SA110
  372. select ISA
  373. select NO_IOPORT
  374. select ARCH_USES_GETTIMEOFFSET
  375. select NEED_MACH_IO_H
  376. select NEED_MACH_MEMORY_H
  377. help
  378. This is an evaluation board for the StrongARM processor available
  379. from Digital. It has limited hardware on-board, including an
  380. Ethernet interface, two PCMCIA sockets, two serial ports and a
  381. parallel port.
  382. config ARCH_EP93XX
  383. bool "EP93xx-based"
  384. select CPU_ARM920T
  385. select ARM_AMBA
  386. select ARM_VIC
  387. select CLKDEV_LOOKUP
  388. select ARCH_REQUIRE_GPIOLIB
  389. select ARCH_HAS_HOLES_MEMORYMODEL
  390. select ARCH_USES_GETTIMEOFFSET
  391. select NEED_MACH_MEMORY_H
  392. help
  393. This enables support for the Cirrus EP93xx series of CPUs.
  394. config ARCH_FOOTBRIDGE
  395. bool "FootBridge"
  396. select CPU_SA110
  397. select FOOTBRIDGE
  398. select GENERIC_CLOCKEVENTS
  399. select HAVE_IDE
  400. select NEED_MACH_IO_H
  401. select NEED_MACH_MEMORY_H
  402. help
  403. Support for systems based on the DC21285 companion chip
  404. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  405. config ARCH_MXC
  406. bool "Freescale MXC/iMX-based"
  407. select GENERIC_CLOCKEVENTS
  408. select ARCH_REQUIRE_GPIOLIB
  409. select CLKDEV_LOOKUP
  410. select CLKSRC_MMIO
  411. select GENERIC_IRQ_CHIP
  412. select MULTI_IRQ_HANDLER
  413. select SPARSE_IRQ
  414. select USE_OF
  415. help
  416. Support for Freescale MXC/iMX-based family of processors
  417. config ARCH_MXS
  418. bool "Freescale MXS-based"
  419. select GENERIC_CLOCKEVENTS
  420. select ARCH_REQUIRE_GPIOLIB
  421. select CLKDEV_LOOKUP
  422. select CLKSRC_MMIO
  423. select COMMON_CLK
  424. select HAVE_CLK_PREPARE
  425. select PINCTRL
  426. select USE_OF
  427. help
  428. Support for Freescale MXS-based family of processors
  429. config ARCH_NETX
  430. bool "Hilscher NetX based"
  431. select CLKSRC_MMIO
  432. select CPU_ARM926T
  433. select ARM_VIC
  434. select GENERIC_CLOCKEVENTS
  435. help
  436. This enables support for systems based on the Hilscher NetX Soc
  437. config ARCH_H720X
  438. bool "Hynix HMS720x-based"
  439. select CPU_ARM720T
  440. select ISA_DMA_API
  441. select ARCH_USES_GETTIMEOFFSET
  442. help
  443. This enables support for systems based on the Hynix HMS720x
  444. config ARCH_IOP13XX
  445. bool "IOP13xx-based"
  446. depends on MMU
  447. select CPU_XSC3
  448. select PLAT_IOP
  449. select PCI
  450. select ARCH_SUPPORTS_MSI
  451. select VMSPLIT_1G
  452. select NEED_MACH_IO_H
  453. select NEED_MACH_MEMORY_H
  454. select NEED_RET_TO_USER
  455. help
  456. Support for Intel's IOP13XX (XScale) family of processors.
  457. config ARCH_IOP32X
  458. bool "IOP32x-based"
  459. depends on MMU
  460. select CPU_XSCALE
  461. select NEED_MACH_IO_H
  462. select NEED_RET_TO_USER
  463. select PLAT_IOP
  464. select PCI
  465. select ARCH_REQUIRE_GPIOLIB
  466. help
  467. Support for Intel's 80219 and IOP32X (XScale) family of
  468. processors.
  469. config ARCH_IOP33X
  470. bool "IOP33x-based"
  471. depends on MMU
  472. select CPU_XSCALE
  473. select NEED_MACH_IO_H
  474. select NEED_RET_TO_USER
  475. select PLAT_IOP
  476. select PCI
  477. select ARCH_REQUIRE_GPIOLIB
  478. help
  479. Support for Intel's IOP33X (XScale) family of processors.
  480. config ARCH_IXP4XX
  481. bool "IXP4xx-based"
  482. depends on MMU
  483. select ARCH_HAS_DMA_SET_COHERENT_MASK
  484. select CLKSRC_MMIO
  485. select CPU_XSCALE
  486. select ARCH_REQUIRE_GPIOLIB
  487. select GENERIC_CLOCKEVENTS
  488. select MIGHT_HAVE_PCI
  489. select NEED_MACH_IO_H
  490. select DMABOUNCE if PCI
  491. help
  492. Support for Intel's IXP4XX (XScale) family of processors.
  493. config ARCH_MVEBU
  494. bool "Marvell SOCs with Device Tree support"
  495. select GENERIC_CLOCKEVENTS
  496. select MULTI_IRQ_HANDLER
  497. select SPARSE_IRQ
  498. select CLKSRC_MMIO
  499. select GENERIC_IRQ_CHIP
  500. select IRQ_DOMAIN
  501. select COMMON_CLK
  502. help
  503. Support for the Marvell SoC Family with device tree support
  504. config ARCH_DOVE
  505. bool "Marvell Dove"
  506. select CPU_V7
  507. select PCI
  508. select ARCH_REQUIRE_GPIOLIB
  509. select GENERIC_CLOCKEVENTS
  510. select NEED_MACH_IO_H
  511. select PLAT_ORION
  512. help
  513. Support for the Marvell Dove SoC 88AP510
  514. config ARCH_KIRKWOOD
  515. bool "Marvell Kirkwood"
  516. select CPU_FEROCEON
  517. select PCI
  518. select ARCH_REQUIRE_GPIOLIB
  519. select GENERIC_CLOCKEVENTS
  520. select NEED_MACH_IO_H
  521. select PLAT_ORION
  522. help
  523. Support for the following Marvell Kirkwood series SoCs:
  524. 88F6180, 88F6192 and 88F6281.
  525. config ARCH_LPC32XX
  526. bool "NXP LPC32XX"
  527. select CLKSRC_MMIO
  528. select CPU_ARM926T
  529. select ARCH_REQUIRE_GPIOLIB
  530. select HAVE_IDE
  531. select ARM_AMBA
  532. select USB_ARCH_HAS_OHCI
  533. select CLKDEV_LOOKUP
  534. select GENERIC_CLOCKEVENTS
  535. select USE_OF
  536. select HAVE_PWM
  537. help
  538. Support for the NXP LPC32XX family of processors
  539. config ARCH_MV78XX0
  540. bool "Marvell MV78xx0"
  541. select CPU_FEROCEON
  542. select PCI
  543. select ARCH_REQUIRE_GPIOLIB
  544. select GENERIC_CLOCKEVENTS
  545. select NEED_MACH_IO_H
  546. select PLAT_ORION
  547. help
  548. Support for the following Marvell MV78xx0 series SoCs:
  549. MV781x0, MV782x0.
  550. config ARCH_ORION5X
  551. bool "Marvell Orion"
  552. depends on MMU
  553. select CPU_FEROCEON
  554. select PCI
  555. select ARCH_REQUIRE_GPIOLIB
  556. select GENERIC_CLOCKEVENTS
  557. select NEED_MACH_IO_H
  558. select PLAT_ORION
  559. help
  560. Support for the following Marvell Orion 5x series SoCs:
  561. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  562. Orion-2 (5281), Orion-1-90 (6183).
  563. config ARCH_MMP
  564. bool "Marvell PXA168/910/MMP2"
  565. depends on MMU
  566. select ARCH_REQUIRE_GPIOLIB
  567. select CLKDEV_LOOKUP
  568. select GENERIC_CLOCKEVENTS
  569. select GPIO_PXA
  570. select IRQ_DOMAIN
  571. select PLAT_PXA
  572. select SPARSE_IRQ
  573. select GENERIC_ALLOCATOR
  574. help
  575. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  576. config ARCH_KS8695
  577. bool "Micrel/Kendin KS8695"
  578. select CPU_ARM922T
  579. select ARCH_REQUIRE_GPIOLIB
  580. select ARCH_USES_GETTIMEOFFSET
  581. select NEED_MACH_MEMORY_H
  582. help
  583. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  584. System-on-Chip devices.
  585. config ARCH_W90X900
  586. bool "Nuvoton W90X900 CPU"
  587. select CPU_ARM926T
  588. select ARCH_REQUIRE_GPIOLIB
  589. select CLKDEV_LOOKUP
  590. select CLKSRC_MMIO
  591. select GENERIC_CLOCKEVENTS
  592. help
  593. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  594. At present, the w90x900 has been renamed nuc900, regarding
  595. the ARM series product line, you can login the following
  596. link address to know more.
  597. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  598. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  599. config ARCH_TEGRA
  600. bool "NVIDIA Tegra"
  601. select CLKDEV_LOOKUP
  602. select CLKSRC_MMIO
  603. select GENERIC_CLOCKEVENTS
  604. select GENERIC_GPIO
  605. select HAVE_CLK
  606. select HAVE_SMP
  607. select MIGHT_HAVE_CACHE_L2X0
  608. select NEED_MACH_IO_H if PCI
  609. select ARCH_HAS_CPUFREQ
  610. select USE_OF
  611. help
  612. This enables support for NVIDIA Tegra based systems (Tegra APX,
  613. Tegra 6xx and Tegra 2 series).
  614. config ARCH_PICOXCELL
  615. bool "Picochip picoXcell"
  616. select ARCH_REQUIRE_GPIOLIB
  617. select ARM_PATCH_PHYS_VIRT
  618. select ARM_VIC
  619. select CPU_V6K
  620. select DW_APB_TIMER
  621. select DW_APB_TIMER_OF
  622. select GENERIC_CLOCKEVENTS
  623. select GENERIC_GPIO
  624. select HAVE_TCM
  625. select NO_IOPORT
  626. select SPARSE_IRQ
  627. select USE_OF
  628. help
  629. This enables support for systems based on the Picochip picoXcell
  630. family of Femtocell devices. The picoxcell support requires device tree
  631. for all boards.
  632. config ARCH_PNX4008
  633. bool "Philips Nexperia PNX4008 Mobile"
  634. select CPU_ARM926T
  635. select CLKDEV_LOOKUP
  636. select ARCH_USES_GETTIMEOFFSET
  637. help
  638. This enables support for Philips PNX4008 mobile platform.
  639. config ARCH_PXA
  640. bool "PXA2xx/PXA3xx-based"
  641. depends on MMU
  642. select ARCH_MTD_XIP
  643. select ARCH_HAS_CPUFREQ
  644. select CLKDEV_LOOKUP
  645. select CLKSRC_MMIO
  646. select ARCH_REQUIRE_GPIOLIB
  647. select GENERIC_CLOCKEVENTS
  648. select GPIO_PXA
  649. select PLAT_PXA
  650. select SPARSE_IRQ
  651. select AUTO_ZRELADDR
  652. select MULTI_IRQ_HANDLER
  653. select ARM_CPU_SUSPEND if PM
  654. select HAVE_IDE
  655. help
  656. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  657. config ARCH_MSM
  658. bool "Qualcomm MSM"
  659. select HAVE_CLK
  660. select GENERIC_CLOCKEVENTS
  661. select ARCH_REQUIRE_GPIOLIB
  662. select CLKDEV_LOOKUP
  663. help
  664. Support for Qualcomm MSM/QSD based systems. This runs on the
  665. apps processor of the MSM/QSD and depends on a shared memory
  666. interface to the modem processor which runs the baseband
  667. stack and controls some vital subsystems
  668. (clock and power control, etc).
  669. config ARCH_SHMOBILE
  670. bool "Renesas SH-Mobile / R-Mobile"
  671. select HAVE_CLK
  672. select CLKDEV_LOOKUP
  673. select HAVE_MACH_CLKDEV
  674. select HAVE_SMP
  675. select GENERIC_CLOCKEVENTS
  676. select MIGHT_HAVE_CACHE_L2X0
  677. select NO_IOPORT
  678. select SPARSE_IRQ
  679. select MULTI_IRQ_HANDLER
  680. select PM_GENERIC_DOMAINS if PM
  681. select NEED_MACH_MEMORY_H
  682. help
  683. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  684. config ARCH_RPC
  685. bool "RiscPC"
  686. select ARCH_ACORN
  687. select FIQ
  688. select ARCH_MAY_HAVE_PC_FDC
  689. select HAVE_PATA_PLATFORM
  690. select ISA_DMA_API
  691. select NO_IOPORT
  692. select ARCH_SPARSEMEM_ENABLE
  693. select ARCH_USES_GETTIMEOFFSET
  694. select HAVE_IDE
  695. select NEED_MACH_IO_H
  696. select NEED_MACH_MEMORY_H
  697. help
  698. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  699. CD-ROM interface, serial and parallel port, and the floppy drive.
  700. config ARCH_SA1100
  701. bool "SA1100-based"
  702. select CLKSRC_MMIO
  703. select CPU_SA1100
  704. select ISA
  705. select ARCH_SPARSEMEM_ENABLE
  706. select ARCH_MTD_XIP
  707. select ARCH_HAS_CPUFREQ
  708. select CPU_FREQ
  709. select GENERIC_CLOCKEVENTS
  710. select CLKDEV_LOOKUP
  711. select ARCH_REQUIRE_GPIOLIB
  712. select HAVE_IDE
  713. select NEED_MACH_MEMORY_H
  714. select SPARSE_IRQ
  715. help
  716. Support for StrongARM 11x0 based boards.
  717. config ARCH_S3C24XX
  718. bool "Samsung S3C24XX SoCs"
  719. select GENERIC_GPIO
  720. select ARCH_HAS_CPUFREQ
  721. select HAVE_CLK
  722. select CLKDEV_LOOKUP
  723. select ARCH_USES_GETTIMEOFFSET
  724. select HAVE_S3C2410_I2C if I2C
  725. select HAVE_S3C_RTC if RTC_CLASS
  726. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  727. select NEED_MACH_IO_H
  728. help
  729. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  730. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  731. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  732. Samsung SMDK2410 development board (and derivatives).
  733. config ARCH_S3C64XX
  734. bool "Samsung S3C64XX"
  735. select PLAT_SAMSUNG
  736. select CPU_V6
  737. select ARM_VIC
  738. select HAVE_CLK
  739. select HAVE_TCM
  740. select CLKDEV_LOOKUP
  741. select NO_IOPORT
  742. select ARCH_USES_GETTIMEOFFSET
  743. select ARCH_HAS_CPUFREQ
  744. select ARCH_REQUIRE_GPIOLIB
  745. select SAMSUNG_CLKSRC
  746. select SAMSUNG_IRQ_VIC_TIMER
  747. select S3C_GPIO_TRACK
  748. select S3C_DEV_NAND
  749. select USB_ARCH_HAS_OHCI
  750. select SAMSUNG_GPIOLIB_4BIT
  751. select HAVE_S3C2410_I2C if I2C
  752. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  753. help
  754. Samsung S3C64XX series based systems
  755. config ARCH_S5P64X0
  756. bool "Samsung S5P6440 S5P6450"
  757. select CPU_V6
  758. select GENERIC_GPIO
  759. select HAVE_CLK
  760. select CLKDEV_LOOKUP
  761. select CLKSRC_MMIO
  762. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  763. select GENERIC_CLOCKEVENTS
  764. select HAVE_S3C2410_I2C if I2C
  765. select HAVE_S3C_RTC if RTC_CLASS
  766. help
  767. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  768. SMDK6450.
  769. config ARCH_S5PC100
  770. bool "Samsung S5PC100"
  771. select GENERIC_GPIO
  772. select HAVE_CLK
  773. select CLKDEV_LOOKUP
  774. select CPU_V7
  775. select ARCH_USES_GETTIMEOFFSET
  776. select HAVE_S3C2410_I2C if I2C
  777. select HAVE_S3C_RTC if RTC_CLASS
  778. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  779. help
  780. Samsung S5PC100 series based systems
  781. config ARCH_S5PV210
  782. bool "Samsung S5PV210/S5PC110"
  783. select CPU_V7
  784. select ARCH_SPARSEMEM_ENABLE
  785. select ARCH_HAS_HOLES_MEMORYMODEL
  786. select GENERIC_GPIO
  787. select HAVE_CLK
  788. select CLKDEV_LOOKUP
  789. select CLKSRC_MMIO
  790. select ARCH_HAS_CPUFREQ
  791. select GENERIC_CLOCKEVENTS
  792. select HAVE_S3C2410_I2C if I2C
  793. select HAVE_S3C_RTC if RTC_CLASS
  794. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  795. select NEED_MACH_MEMORY_H
  796. help
  797. Samsung S5PV210/S5PC110 series based systems
  798. config ARCH_EXYNOS
  799. bool "SAMSUNG EXYNOS"
  800. select CPU_V7
  801. select ARCH_SPARSEMEM_ENABLE
  802. select ARCH_HAS_HOLES_MEMORYMODEL
  803. select GENERIC_GPIO
  804. select HAVE_CLK
  805. select CLKDEV_LOOKUP
  806. select ARCH_HAS_CPUFREQ
  807. select GENERIC_CLOCKEVENTS
  808. select HAVE_S3C_RTC if RTC_CLASS
  809. select HAVE_S3C2410_I2C if I2C
  810. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  811. select NEED_MACH_MEMORY_H
  812. help
  813. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  814. config ARCH_SHARK
  815. bool "Shark"
  816. select CPU_SA110
  817. select ISA
  818. select ISA_DMA
  819. select ZONE_DMA
  820. select PCI
  821. select ARCH_USES_GETTIMEOFFSET
  822. select NEED_MACH_MEMORY_H
  823. select NEED_MACH_IO_H
  824. help
  825. Support for the StrongARM based Digital DNARD machine, also known
  826. as "Shark" (<http://www.shark-linux.de/shark.html>).
  827. config ARCH_U300
  828. bool "ST-Ericsson U300 Series"
  829. depends on MMU
  830. select CLKSRC_MMIO
  831. select CPU_ARM926T
  832. select HAVE_TCM
  833. select ARM_AMBA
  834. select ARM_PATCH_PHYS_VIRT
  835. select ARM_VIC
  836. select GENERIC_CLOCKEVENTS
  837. select CLKDEV_LOOKUP
  838. select COMMON_CLK
  839. select GENERIC_GPIO
  840. select ARCH_REQUIRE_GPIOLIB
  841. help
  842. Support for ST-Ericsson U300 series mobile platforms.
  843. config ARCH_U8500
  844. bool "ST-Ericsson U8500 Series"
  845. depends on MMU
  846. select CPU_V7
  847. select ARM_AMBA
  848. select GENERIC_CLOCKEVENTS
  849. select CLKDEV_LOOKUP
  850. select ARCH_REQUIRE_GPIOLIB
  851. select ARCH_HAS_CPUFREQ
  852. select HAVE_SMP
  853. select MIGHT_HAVE_CACHE_L2X0
  854. help
  855. Support for ST-Ericsson's Ux500 architecture
  856. config ARCH_NOMADIK
  857. bool "STMicroelectronics Nomadik"
  858. select ARM_AMBA
  859. select ARM_VIC
  860. select CPU_ARM926T
  861. select COMMON_CLK
  862. select GENERIC_CLOCKEVENTS
  863. select PINCTRL
  864. select MIGHT_HAVE_CACHE_L2X0
  865. select ARCH_REQUIRE_GPIOLIB
  866. help
  867. Support for the Nomadik platform by ST-Ericsson
  868. config ARCH_DAVINCI
  869. bool "TI DaVinci"
  870. select GENERIC_CLOCKEVENTS
  871. select ARCH_REQUIRE_GPIOLIB
  872. select ZONE_DMA
  873. select HAVE_IDE
  874. select CLKDEV_LOOKUP
  875. select GENERIC_ALLOCATOR
  876. select GENERIC_IRQ_CHIP
  877. select ARCH_HAS_HOLES_MEMORYMODEL
  878. help
  879. Support for TI's DaVinci platform.
  880. config ARCH_OMAP
  881. bool "TI OMAP"
  882. depends on MMU
  883. select HAVE_CLK
  884. select ARCH_REQUIRE_GPIOLIB
  885. select ARCH_HAS_CPUFREQ
  886. select CLKSRC_MMIO
  887. select GENERIC_CLOCKEVENTS
  888. select ARCH_HAS_HOLES_MEMORYMODEL
  889. help
  890. Support for TI's OMAP platform (OMAP1/2/3/4).
  891. config PLAT_SPEAR
  892. bool "ST SPEAr"
  893. select ARM_AMBA
  894. select ARCH_REQUIRE_GPIOLIB
  895. select CLKDEV_LOOKUP
  896. select COMMON_CLK
  897. select CLKSRC_MMIO
  898. select GENERIC_CLOCKEVENTS
  899. select HAVE_CLK
  900. help
  901. Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
  902. config ARCH_VT8500
  903. bool "VIA/WonderMedia 85xx"
  904. select CPU_ARM926T
  905. select GENERIC_GPIO
  906. select ARCH_HAS_CPUFREQ
  907. select GENERIC_CLOCKEVENTS
  908. select ARCH_REQUIRE_GPIOLIB
  909. help
  910. Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
  911. config ARCH_ZYNQ
  912. bool "Xilinx Zynq ARM Cortex A9 Platform"
  913. select CPU_V7
  914. select GENERIC_CLOCKEVENTS
  915. select CLKDEV_LOOKUP
  916. select ARM_GIC
  917. select ARM_AMBA
  918. select ICST
  919. select MIGHT_HAVE_CACHE_L2X0
  920. select USE_OF
  921. help
  922. Support for Xilinx Zynq ARM Cortex A9 Platform
  923. endchoice
  924. #
  925. # This is sorted alphabetically by mach-* pathname. However, plat-*
  926. # Kconfigs may be included either alphabetically (according to the
  927. # plat- suffix) or along side the corresponding mach-* source.
  928. #
  929. source "arch/arm/mach-mvebu/Kconfig"
  930. source "arch/arm/mach-at91/Kconfig"
  931. source "arch/arm/mach-bcmring/Kconfig"
  932. source "arch/arm/mach-clps711x/Kconfig"
  933. source "arch/arm/mach-cns3xxx/Kconfig"
  934. source "arch/arm/mach-davinci/Kconfig"
  935. source "arch/arm/mach-dove/Kconfig"
  936. source "arch/arm/mach-ep93xx/Kconfig"
  937. source "arch/arm/mach-footbridge/Kconfig"
  938. source "arch/arm/mach-gemini/Kconfig"
  939. source "arch/arm/mach-h720x/Kconfig"
  940. source "arch/arm/mach-integrator/Kconfig"
  941. source "arch/arm/mach-iop32x/Kconfig"
  942. source "arch/arm/mach-iop33x/Kconfig"
  943. source "arch/arm/mach-iop13xx/Kconfig"
  944. source "arch/arm/mach-ixp4xx/Kconfig"
  945. source "arch/arm/mach-kirkwood/Kconfig"
  946. source "arch/arm/mach-ks8695/Kconfig"
  947. source "arch/arm/mach-msm/Kconfig"
  948. source "arch/arm/mach-mv78xx0/Kconfig"
  949. source "arch/arm/plat-mxc/Kconfig"
  950. source "arch/arm/mach-mxs/Kconfig"
  951. source "arch/arm/mach-netx/Kconfig"
  952. source "arch/arm/mach-nomadik/Kconfig"
  953. source "arch/arm/plat-nomadik/Kconfig"
  954. source "arch/arm/plat-omap/Kconfig"
  955. source "arch/arm/mach-omap1/Kconfig"
  956. source "arch/arm/mach-omap2/Kconfig"
  957. source "arch/arm/mach-orion5x/Kconfig"
  958. source "arch/arm/mach-pxa/Kconfig"
  959. source "arch/arm/plat-pxa/Kconfig"
  960. source "arch/arm/mach-mmp/Kconfig"
  961. source "arch/arm/mach-realview/Kconfig"
  962. source "arch/arm/mach-sa1100/Kconfig"
  963. source "arch/arm/plat-samsung/Kconfig"
  964. source "arch/arm/plat-s3c24xx/Kconfig"
  965. source "arch/arm/plat-spear/Kconfig"
  966. source "arch/arm/mach-s3c24xx/Kconfig"
  967. if ARCH_S3C24XX
  968. source "arch/arm/mach-s3c2412/Kconfig"
  969. source "arch/arm/mach-s3c2440/Kconfig"
  970. endif
  971. if ARCH_S3C64XX
  972. source "arch/arm/mach-s3c64xx/Kconfig"
  973. endif
  974. source "arch/arm/mach-s5p64x0/Kconfig"
  975. source "arch/arm/mach-s5pc100/Kconfig"
  976. source "arch/arm/mach-s5pv210/Kconfig"
  977. source "arch/arm/mach-exynos/Kconfig"
  978. source "arch/arm/mach-shmobile/Kconfig"
  979. source "arch/arm/mach-tegra/Kconfig"
  980. source "arch/arm/mach-u300/Kconfig"
  981. source "arch/arm/mach-ux500/Kconfig"
  982. source "arch/arm/mach-versatile/Kconfig"
  983. source "arch/arm/mach-vexpress/Kconfig"
  984. source "arch/arm/plat-versatile/Kconfig"
  985. source "arch/arm/mach-vt8500/Kconfig"
  986. source "arch/arm/mach-w90x900/Kconfig"
  987. # Definitions to make life easier
  988. config ARCH_ACORN
  989. bool
  990. config PLAT_IOP
  991. bool
  992. select GENERIC_CLOCKEVENTS
  993. config PLAT_ORION
  994. bool
  995. select CLKSRC_MMIO
  996. select GENERIC_IRQ_CHIP
  997. select COMMON_CLK
  998. config PLAT_PXA
  999. bool
  1000. config PLAT_VERSATILE
  1001. bool
  1002. config ARM_TIMER_SP804
  1003. bool
  1004. select CLKSRC_MMIO
  1005. select HAVE_SCHED_CLOCK
  1006. source arch/arm/mm/Kconfig
  1007. config ARM_NR_BANKS
  1008. int
  1009. default 16 if ARCH_EP93XX
  1010. default 8
  1011. config IWMMXT
  1012. bool "Enable iWMMXt support"
  1013. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  1014. default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
  1015. help
  1016. Enable support for iWMMXt context switching at run time if
  1017. running on a CPU that supports it.
  1018. config XSCALE_PMU
  1019. bool
  1020. depends on CPU_XSCALE
  1021. default y
  1022. config CPU_HAS_PMU
  1023. depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
  1024. (!ARCH_OMAP3 || OMAP3_EMU)
  1025. default y
  1026. bool
  1027. config MULTI_IRQ_HANDLER
  1028. bool
  1029. help
  1030. Allow each machine to specify it's own IRQ handler at run time.
  1031. if !MMU
  1032. source "arch/arm/Kconfig-nommu"
  1033. endif
  1034. config ARM_ERRATA_326103
  1035. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  1036. depends on CPU_V6
  1037. help
  1038. Executing a SWP instruction to read-only memory does not set bit 11
  1039. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  1040. treat the access as a read, preventing a COW from occurring and
  1041. causing the faulting task to livelock.
  1042. config ARM_ERRATA_411920
  1043. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  1044. depends on CPU_V6 || CPU_V6K
  1045. help
  1046. Invalidation of the Instruction Cache operation can
  1047. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  1048. It does not affect the MPCore. This option enables the ARM Ltd.
  1049. recommended workaround.
  1050. config ARM_ERRATA_430973
  1051. bool "ARM errata: Stale prediction on replaced interworking branch"
  1052. depends on CPU_V7
  1053. help
  1054. This option enables the workaround for the 430973 Cortex-A8
  1055. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  1056. interworking branch is replaced with another code sequence at the
  1057. same virtual address, whether due to self-modifying code or virtual
  1058. to physical address re-mapping, Cortex-A8 does not recover from the
  1059. stale interworking branch prediction. This results in Cortex-A8
  1060. executing the new code sequence in the incorrect ARM or Thumb state.
  1061. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  1062. and also flushes the branch target cache at every context switch.
  1063. Note that setting specific bits in the ACTLR register may not be
  1064. available in non-secure mode.
  1065. config ARM_ERRATA_458693
  1066. bool "ARM errata: Processor deadlock when a false hazard is created"
  1067. depends on CPU_V7
  1068. help
  1069. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  1070. erratum. For very specific sequences of memory operations, it is
  1071. possible for a hazard condition intended for a cache line to instead
  1072. be incorrectly associated with a different cache line. This false
  1073. hazard might then cause a processor deadlock. The workaround enables
  1074. the L1 caching of the NEON accesses and disables the PLD instruction
  1075. in the ACTLR register. Note that setting specific bits in the ACTLR
  1076. register may not be available in non-secure mode.
  1077. config ARM_ERRATA_460075
  1078. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  1079. depends on CPU_V7
  1080. help
  1081. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  1082. erratum. Any asynchronous access to the L2 cache may encounter a
  1083. situation in which recent store transactions to the L2 cache are lost
  1084. and overwritten with stale memory contents from external memory. The
  1085. workaround disables the write-allocate mode for the L2 cache via the
  1086. ACTLR register. Note that setting specific bits in the ACTLR register
  1087. may not be available in non-secure mode.
  1088. config ARM_ERRATA_742230
  1089. bool "ARM errata: DMB operation may be faulty"
  1090. depends on CPU_V7 && SMP
  1091. help
  1092. This option enables the workaround for the 742230 Cortex-A9
  1093. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  1094. between two write operations may not ensure the correct visibility
  1095. ordering of the two writes. This workaround sets a specific bit in
  1096. the diagnostic register of the Cortex-A9 which causes the DMB
  1097. instruction to behave as a DSB, ensuring the correct behaviour of
  1098. the two writes.
  1099. config ARM_ERRATA_742231
  1100. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  1101. depends on CPU_V7 && SMP
  1102. help
  1103. This option enables the workaround for the 742231 Cortex-A9
  1104. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  1105. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  1106. accessing some data located in the same cache line, may get corrupted
  1107. data due to bad handling of the address hazard when the line gets
  1108. replaced from one of the CPUs at the same time as another CPU is
  1109. accessing it. This workaround sets specific bits in the diagnostic
  1110. register of the Cortex-A9 which reduces the linefill issuing
  1111. capabilities of the processor.
  1112. config PL310_ERRATA_588369
  1113. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  1114. depends on CACHE_L2X0
  1115. help
  1116. The PL310 L2 cache controller implements three types of Clean &
  1117. Invalidate maintenance operations: by Physical Address
  1118. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1119. They are architecturally defined to behave as the execution of a
  1120. clean operation followed immediately by an invalidate operation,
  1121. both performing to the same memory location. This functionality
  1122. is not correctly implemented in PL310 as clean lines are not
  1123. invalidated as a result of these operations.
  1124. config ARM_ERRATA_720789
  1125. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1126. depends on CPU_V7
  1127. help
  1128. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1129. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1130. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1131. As a consequence of this erratum, some TLB entries which should be
  1132. invalidated are not, resulting in an incoherency in the system page
  1133. tables. The workaround changes the TLB flushing routines to invalidate
  1134. entries regardless of the ASID.
  1135. config PL310_ERRATA_727915
  1136. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1137. depends on CACHE_L2X0
  1138. help
  1139. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1140. operation (offset 0x7FC). This operation runs in background so that
  1141. PL310 can handle normal accesses while it is in progress. Under very
  1142. rare circumstances, due to this erratum, write data can be lost when
  1143. PL310 treats a cacheable write transaction during a Clean &
  1144. Invalidate by Way operation.
  1145. config ARM_ERRATA_743622
  1146. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1147. depends on CPU_V7
  1148. help
  1149. This option enables the workaround for the 743622 Cortex-A9
  1150. (r2p*) erratum. Under very rare conditions, a faulty
  1151. optimisation in the Cortex-A9 Store Buffer may lead to data
  1152. corruption. This workaround sets a specific bit in the diagnostic
  1153. register of the Cortex-A9 which disables the Store Buffer
  1154. optimisation, preventing the defect from occurring. This has no
  1155. visible impact on the overall performance or power consumption of the
  1156. processor.
  1157. config ARM_ERRATA_751472
  1158. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1159. depends on CPU_V7
  1160. help
  1161. This option enables the workaround for the 751472 Cortex-A9 (prior
  1162. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1163. completion of a following broadcasted operation if the second
  1164. operation is received by a CPU before the ICIALLUIS has completed,
  1165. potentially leading to corrupted entries in the cache or TLB.
  1166. config PL310_ERRATA_753970
  1167. bool "PL310 errata: cache sync operation may be faulty"
  1168. depends on CACHE_PL310
  1169. help
  1170. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1171. Under some condition the effect of cache sync operation on
  1172. the store buffer still remains when the operation completes.
  1173. This means that the store buffer is always asked to drain and
  1174. this prevents it from merging any further writes. The workaround
  1175. is to replace the normal offset of cache sync operation (0x730)
  1176. by another offset targeting an unmapped PL310 register 0x740.
  1177. This has the same effect as the cache sync operation: store buffer
  1178. drain and waiting for all buffers empty.
  1179. config ARM_ERRATA_754322
  1180. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1181. depends on CPU_V7
  1182. help
  1183. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1184. r3p*) erratum. A speculative memory access may cause a page table walk
  1185. which starts prior to an ASID switch but completes afterwards. This
  1186. can populate the micro-TLB with a stale entry which may be hit with
  1187. the new ASID. This workaround places two dsb instructions in the mm
  1188. switching code so that no page table walks can cross the ASID switch.
  1189. config ARM_ERRATA_754327
  1190. bool "ARM errata: no automatic Store Buffer drain"
  1191. depends on CPU_V7 && SMP
  1192. help
  1193. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1194. r2p0) erratum. The Store Buffer does not have any automatic draining
  1195. mechanism and therefore a livelock may occur if an external agent
  1196. continuously polls a memory location waiting to observe an update.
  1197. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1198. written polling loops from denying visibility of updates to memory.
  1199. config ARM_ERRATA_364296
  1200. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1201. depends on CPU_V6 && !SMP
  1202. help
  1203. This options enables the workaround for the 364296 ARM1136
  1204. r0p2 erratum (possible cache data corruption with
  1205. hit-under-miss enabled). It sets the undocumented bit 31 in
  1206. the auxiliary control register and the FI bit in the control
  1207. register, thus disabling hit-under-miss without putting the
  1208. processor into full low interrupt latency mode. ARM11MPCore
  1209. is not affected.
  1210. config ARM_ERRATA_764369
  1211. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1212. depends on CPU_V7 && SMP
  1213. help
  1214. This option enables the workaround for erratum 764369
  1215. affecting Cortex-A9 MPCore with two or more processors (all
  1216. current revisions). Under certain timing circumstances, a data
  1217. cache line maintenance operation by MVA targeting an Inner
  1218. Shareable memory region may fail to proceed up to either the
  1219. Point of Coherency or to the Point of Unification of the
  1220. system. This workaround adds a DSB instruction before the
  1221. relevant cache maintenance functions and sets a specific bit
  1222. in the diagnostic control register of the SCU.
  1223. config PL310_ERRATA_769419
  1224. bool "PL310 errata: no automatic Store Buffer drain"
  1225. depends on CACHE_L2X0
  1226. help
  1227. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1228. not automatically drain. This can cause normal, non-cacheable
  1229. writes to be retained when the memory system is idle, leading
  1230. to suboptimal I/O performance for drivers using coherent DMA.
  1231. This option adds a write barrier to the cpu_idle loop so that,
  1232. on systems with an outer cache, the store buffer is drained
  1233. explicitly.
  1234. endmenu
  1235. source "arch/arm/common/Kconfig"
  1236. menu "Bus support"
  1237. config ARM_AMBA
  1238. bool
  1239. config ISA
  1240. bool
  1241. help
  1242. Find out whether you have ISA slots on your motherboard. ISA is the
  1243. name of a bus system, i.e. the way the CPU talks to the other stuff
  1244. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1245. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1246. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1247. # Select ISA DMA controller support
  1248. config ISA_DMA
  1249. bool
  1250. select ISA_DMA_API
  1251. # Select ISA DMA interface
  1252. config ISA_DMA_API
  1253. bool
  1254. config PCI
  1255. bool "PCI support" if MIGHT_HAVE_PCI
  1256. help
  1257. Find out whether you have a PCI motherboard. PCI is the name of a
  1258. bus system, i.e. the way the CPU talks to the other stuff inside
  1259. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1260. VESA. If you have PCI, say Y, otherwise N.
  1261. config PCI_DOMAINS
  1262. bool
  1263. depends on PCI
  1264. config PCI_NANOENGINE
  1265. bool "BSE nanoEngine PCI support"
  1266. depends on SA1100_NANOENGINE
  1267. help
  1268. Enable PCI on the BSE nanoEngine board.
  1269. config PCI_SYSCALL
  1270. def_bool PCI
  1271. # Select the host bridge type
  1272. config PCI_HOST_VIA82C505
  1273. bool
  1274. depends on PCI && ARCH_SHARK
  1275. default y
  1276. config PCI_HOST_ITE8152
  1277. bool
  1278. depends on PCI && MACH_ARMCORE
  1279. default y
  1280. select DMABOUNCE
  1281. source "drivers/pci/Kconfig"
  1282. source "drivers/pcmcia/Kconfig"
  1283. endmenu
  1284. menu "Kernel Features"
  1285. config HAVE_SMP
  1286. bool
  1287. help
  1288. This option should be selected by machines which have an SMP-
  1289. capable CPU.
  1290. The only effect of this option is to make the SMP-related
  1291. options available to the user for configuration.
  1292. config SMP
  1293. bool "Symmetric Multi-Processing"
  1294. depends on CPU_V6K || CPU_V7
  1295. depends on GENERIC_CLOCKEVENTS
  1296. depends on HAVE_SMP
  1297. depends on MMU
  1298. select USE_GENERIC_SMP_HELPERS
  1299. select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
  1300. help
  1301. This enables support for systems with more than one CPU. If you have
  1302. a system with only one CPU, like most personal computers, say N. If
  1303. you have a system with more than one CPU, say Y.
  1304. If you say N here, the kernel will run on single and multiprocessor
  1305. machines, but will use only one CPU of a multiprocessor machine. If
  1306. you say Y here, the kernel will run on many, but not all, single
  1307. processor machines. On a single processor machine, the kernel will
  1308. run faster if you say N here.
  1309. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1310. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1311. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1312. If you don't know what to do here, say N.
  1313. config SMP_ON_UP
  1314. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1315. depends on EXPERIMENTAL
  1316. depends on SMP && !XIP_KERNEL
  1317. default y
  1318. help
  1319. SMP kernels contain instructions which fail on non-SMP processors.
  1320. Enabling this option allows the kernel to modify itself to make
  1321. these instructions safe. Disabling it allows about 1K of space
  1322. savings.
  1323. If you don't know what to do here, say Y.
  1324. config ARM_CPU_TOPOLOGY
  1325. bool "Support cpu topology definition"
  1326. depends on SMP && CPU_V7
  1327. default y
  1328. help
  1329. Support ARM cpu topology definition. The MPIDR register defines
  1330. affinity between processors which is then used to describe the cpu
  1331. topology of an ARM System.
  1332. config SCHED_MC
  1333. bool "Multi-core scheduler support"
  1334. depends on ARM_CPU_TOPOLOGY
  1335. help
  1336. Multi-core scheduler support improves the CPU scheduler's decision
  1337. making when dealing with multi-core CPU chips at a cost of slightly
  1338. increased overhead in some places. If unsure say N here.
  1339. config SCHED_SMT
  1340. bool "SMT scheduler support"
  1341. depends on ARM_CPU_TOPOLOGY
  1342. help
  1343. Improves the CPU scheduler's decision making when dealing with
  1344. MultiThreading at a cost of slightly increased overhead in some
  1345. places. If unsure say N here.
  1346. config HAVE_ARM_SCU
  1347. bool
  1348. help
  1349. This option enables support for the ARM system coherency unit
  1350. config ARM_ARCH_TIMER
  1351. bool "Architected timer support"
  1352. depends on CPU_V7
  1353. help
  1354. This option enables support for the ARM architected timer
  1355. config HAVE_ARM_TWD
  1356. bool
  1357. depends on SMP
  1358. help
  1359. This options enables support for the ARM timer and watchdog unit
  1360. choice
  1361. prompt "Memory split"
  1362. default VMSPLIT_3G
  1363. help
  1364. Select the desired split between kernel and user memory.
  1365. If you are not absolutely sure what you are doing, leave this
  1366. option alone!
  1367. config VMSPLIT_3G
  1368. bool "3G/1G user/kernel split"
  1369. config VMSPLIT_2G
  1370. bool "2G/2G user/kernel split"
  1371. config VMSPLIT_1G
  1372. bool "1G/3G user/kernel split"
  1373. endchoice
  1374. config PAGE_OFFSET
  1375. hex
  1376. default 0x40000000 if VMSPLIT_1G
  1377. default 0x80000000 if VMSPLIT_2G
  1378. default 0xC0000000
  1379. config NR_CPUS
  1380. int "Maximum number of CPUs (2-32)"
  1381. range 2 32
  1382. depends on SMP
  1383. default "4"
  1384. config HOTPLUG_CPU
  1385. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  1386. depends on SMP && HOTPLUG && EXPERIMENTAL
  1387. help
  1388. Say Y here to experiment with turning CPUs off and on. CPUs
  1389. can be controlled through /sys/devices/system/cpu.
  1390. config LOCAL_TIMERS
  1391. bool "Use local timer interrupts"
  1392. depends on SMP
  1393. default y
  1394. select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
  1395. help
  1396. Enable support for local timers on SMP platforms, rather then the
  1397. legacy IPI broadcast method. Local timers allows the system
  1398. accounting to be spread across the timer interval, preventing a
  1399. "thundering herd" at every timer tick.
  1400. config ARCH_NR_GPIO
  1401. int
  1402. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1403. default 355 if ARCH_U8500
  1404. default 264 if MACH_H4700
  1405. default 512 if SOC_OMAP5
  1406. default 0
  1407. help
  1408. Maximum number of GPIOs in the system.
  1409. If unsure, leave the default value.
  1410. source kernel/Kconfig.preempt
  1411. config HZ
  1412. int
  1413. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1414. ARCH_S5PV210 || ARCH_EXYNOS4
  1415. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  1416. default AT91_TIMER_HZ if ARCH_AT91
  1417. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1418. default 100
  1419. config THUMB2_KERNEL
  1420. bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
  1421. depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
  1422. select AEABI
  1423. select ARM_ASM_UNIFIED
  1424. select ARM_UNWIND
  1425. help
  1426. By enabling this option, the kernel will be compiled in
  1427. Thumb-2 mode. A compiler/assembler that understand the unified
  1428. ARM-Thumb syntax is needed.
  1429. If unsure, say N.
  1430. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1431. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1432. depends on THUMB2_KERNEL && MODULES
  1433. default y
  1434. help
  1435. Various binutils versions can resolve Thumb-2 branches to
  1436. locally-defined, preemptible global symbols as short-range "b.n"
  1437. branch instructions.
  1438. This is a problem, because there's no guarantee the final
  1439. destination of the symbol, or any candidate locations for a
  1440. trampoline, are within range of the branch. For this reason, the
  1441. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1442. relocation in modules at all, and it makes little sense to add
  1443. support.
  1444. The symptom is that the kernel fails with an "unsupported
  1445. relocation" error when loading some modules.
  1446. Until fixed tools are available, passing
  1447. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1448. code which hits this problem, at the cost of a bit of extra runtime
  1449. stack usage in some cases.
  1450. The problem is described in more detail at:
  1451. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1452. Only Thumb-2 kernels are affected.
  1453. Unless you are sure your tools don't have this problem, say Y.
  1454. config ARM_ASM_UNIFIED
  1455. bool
  1456. config AEABI
  1457. bool "Use the ARM EABI to compile the kernel"
  1458. help
  1459. This option allows for the kernel to be compiled using the latest
  1460. ARM ABI (aka EABI). This is only useful if you are using a user
  1461. space environment that is also compiled with EABI.
  1462. Since there are major incompatibilities between the legacy ABI and
  1463. EABI, especially with regard to structure member alignment, this
  1464. option also changes the kernel syscall calling convention to
  1465. disambiguate both ABIs and allow for backward compatibility support
  1466. (selected with CONFIG_OABI_COMPAT).
  1467. To use this you need GCC version 4.0.0 or later.
  1468. config OABI_COMPAT
  1469. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1470. depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
  1471. default y
  1472. help
  1473. This option preserves the old syscall interface along with the
  1474. new (ARM EABI) one. It also provides a compatibility layer to
  1475. intercept syscalls that have structure arguments which layout
  1476. in memory differs between the legacy ABI and the new ARM EABI
  1477. (only for non "thumb" binaries). This option adds a tiny
  1478. overhead to all syscalls and produces a slightly larger kernel.
  1479. If you know you'll be using only pure EABI user space then you
  1480. can say N here. If this option is not selected and you attempt
  1481. to execute a legacy ABI binary then the result will be
  1482. UNPREDICTABLE (in fact it can be predicted that it won't work
  1483. at all). If in doubt say Y.
  1484. config ARCH_HAS_HOLES_MEMORYMODEL
  1485. bool
  1486. config ARCH_SPARSEMEM_ENABLE
  1487. bool
  1488. config ARCH_SPARSEMEM_DEFAULT
  1489. def_bool ARCH_SPARSEMEM_ENABLE
  1490. config ARCH_SELECT_MEMORY_MODEL
  1491. def_bool ARCH_SPARSEMEM_ENABLE
  1492. config HAVE_ARCH_PFN_VALID
  1493. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1494. config HIGHMEM
  1495. bool "High Memory Support"
  1496. depends on MMU
  1497. help
  1498. The address space of ARM processors is only 4 Gigabytes large
  1499. and it has to accommodate user address space, kernel address
  1500. space as well as some memory mapped IO. That means that, if you
  1501. have a large amount of physical memory and/or IO, not all of the
  1502. memory can be "permanently mapped" by the kernel. The physical
  1503. memory that is not permanently mapped is called "high memory".
  1504. Depending on the selected kernel/user memory split, minimum
  1505. vmalloc space and actual amount of RAM, you may not need this
  1506. option which should result in a slightly faster kernel.
  1507. If unsure, say n.
  1508. config HIGHPTE
  1509. bool "Allocate 2nd-level pagetables from highmem"
  1510. depends on HIGHMEM
  1511. config HW_PERF_EVENTS
  1512. bool "Enable hardware performance counter support for perf events"
  1513. depends on PERF_EVENTS && CPU_HAS_PMU
  1514. default y
  1515. help
  1516. Enable hardware performance counter support for perf events. If
  1517. disabled, perf events will use software events only.
  1518. source "mm/Kconfig"
  1519. config FORCE_MAX_ZONEORDER
  1520. int "Maximum zone order" if ARCH_SHMOBILE
  1521. range 11 64 if ARCH_SHMOBILE
  1522. default "9" if SA1111
  1523. default "11"
  1524. help
  1525. The kernel memory allocator divides physically contiguous memory
  1526. blocks into "zones", where each zone is a power of two number of
  1527. pages. This option selects the largest power of two that the kernel
  1528. keeps in the memory allocator. If you need to allocate very large
  1529. blocks of physically contiguous memory, then you may need to
  1530. increase this value.
  1531. This config option is actually maximum order plus one. For example,
  1532. a value of 11 means that the largest free memory block is 2^10 pages.
  1533. config LEDS
  1534. bool "Timer and CPU usage LEDs"
  1535. depends on ARCH_CDB89712 || ARCH_EBSA110 || \
  1536. ARCH_EBSA285 || ARCH_INTEGRATOR || \
  1537. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  1538. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  1539. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  1540. ARCH_AT91 || ARCH_DAVINCI || \
  1541. ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
  1542. help
  1543. If you say Y here, the LEDs on your machine will be used
  1544. to provide useful information about your current system status.
  1545. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  1546. be able to select which LEDs are active using the options below. If
  1547. you are compiling a kernel for the EBSA-110 or the LART however, the
  1548. red LED will simply flash regularly to indicate that the system is
  1549. still functional. It is safe to say Y here if you have a CATS
  1550. system, but the driver will do nothing.
  1551. config LEDS_TIMER
  1552. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  1553. OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1554. || MACH_OMAP_PERSEUS2
  1555. depends on LEDS
  1556. depends on !GENERIC_CLOCKEVENTS
  1557. default y if ARCH_EBSA110
  1558. help
  1559. If you say Y here, one of the system LEDs (the green one on the
  1560. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  1561. will flash regularly to indicate that the system is still
  1562. operational. This is mainly useful to kernel hackers who are
  1563. debugging unstable kernels.
  1564. The LART uses the same LED for both Timer LED and CPU usage LED
  1565. functions. You may choose to use both, but the Timer LED function
  1566. will overrule the CPU usage LED.
  1567. config LEDS_CPU
  1568. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  1569. !ARCH_OMAP) \
  1570. || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1571. || MACH_OMAP_PERSEUS2
  1572. depends on LEDS
  1573. help
  1574. If you say Y here, the red LED will be used to give a good real
  1575. time indication of CPU usage, by lighting whenever the idle task
  1576. is not currently executing.
  1577. The LART uses the same LED for both Timer LED and CPU usage LED
  1578. functions. You may choose to use both, but the Timer LED function
  1579. will overrule the CPU usage LED.
  1580. config ALIGNMENT_TRAP
  1581. bool
  1582. depends on CPU_CP15_MMU
  1583. default y if !ARCH_EBSA110
  1584. select HAVE_PROC_CPU if PROC_FS
  1585. help
  1586. ARM processors cannot fetch/store information which is not
  1587. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1588. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1589. fetch/store instructions will be emulated in software if you say
  1590. here, which has a severe performance impact. This is necessary for
  1591. correct operation of some network protocols. With an IP-only
  1592. configuration it is safe to say N, otherwise say Y.
  1593. config UACCESS_WITH_MEMCPY
  1594. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
  1595. depends on MMU && EXPERIMENTAL
  1596. default y if CPU_FEROCEON
  1597. help
  1598. Implement faster copy_to_user and clear_user methods for CPU
  1599. cores where a 8-word STM instruction give significantly higher
  1600. memory write throughput than a sequence of individual 32bit stores.
  1601. A possible side effect is a slight increase in scheduling latency
  1602. between threads sharing the same address space if they invoke
  1603. such copy operations with large buffers.
  1604. However, if the CPU data cache is using a write-allocate mode,
  1605. this option is unlikely to provide any performance gain.
  1606. config SECCOMP
  1607. bool
  1608. prompt "Enable seccomp to safely compute untrusted bytecode"
  1609. ---help---
  1610. This kernel feature is useful for number crunching applications
  1611. that may need to compute untrusted bytecode during their
  1612. execution. By using pipes or other transports made available to
  1613. the process as file descriptors supporting the read/write
  1614. syscalls, it's possible to isolate those applications in
  1615. their own address space using seccomp. Once seccomp is
  1616. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1617. and the task is only allowed to execute a few safe syscalls
  1618. defined by each seccomp mode.
  1619. config CC_STACKPROTECTOR
  1620. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1621. depends on EXPERIMENTAL
  1622. help
  1623. This option turns on the -fstack-protector GCC feature. This
  1624. feature puts, at the beginning of functions, a canary value on
  1625. the stack just before the return address, and validates
  1626. the value just before actually returning. Stack based buffer
  1627. overflows (that need to overwrite this return address) now also
  1628. overwrite the canary, which gets detected and the attack is then
  1629. neutralized via a kernel panic.
  1630. This feature requires gcc version 4.2 or above.
  1631. config DEPRECATED_PARAM_STRUCT
  1632. bool "Provide old way to pass kernel parameters"
  1633. help
  1634. This was deprecated in 2001 and announced to live on for 5 years.
  1635. Some old boot loaders still use this way.
  1636. endmenu
  1637. menu "Boot options"
  1638. config USE_OF
  1639. bool "Flattened Device Tree support"
  1640. select OF
  1641. select OF_EARLY_FLATTREE
  1642. select IRQ_DOMAIN
  1643. help
  1644. Include support for flattened device tree machine descriptions.
  1645. # Compressed boot loader in ROM. Yes, we really want to ask about
  1646. # TEXT and BSS so we preserve their values in the config files.
  1647. config ZBOOT_ROM_TEXT
  1648. hex "Compressed ROM boot loader base address"
  1649. default "0"
  1650. help
  1651. The physical address at which the ROM-able zImage is to be
  1652. placed in the target. Platforms which normally make use of
  1653. ROM-able zImage formats normally set this to a suitable
  1654. value in their defconfig file.
  1655. If ZBOOT_ROM is not enabled, this has no effect.
  1656. config ZBOOT_ROM_BSS
  1657. hex "Compressed ROM boot loader BSS address"
  1658. default "0"
  1659. help
  1660. The base address of an area of read/write memory in the target
  1661. for the ROM-able zImage which must be available while the
  1662. decompressor is running. It must be large enough to hold the
  1663. entire decompressed kernel plus an additional 128 KiB.
  1664. Platforms which normally make use of ROM-able zImage formats
  1665. normally set this to a suitable value in their defconfig file.
  1666. If ZBOOT_ROM is not enabled, this has no effect.
  1667. config ZBOOT_ROM
  1668. bool "Compressed boot loader in ROM/flash"
  1669. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1670. help
  1671. Say Y here if you intend to execute your compressed kernel image
  1672. (zImage) directly from ROM or flash. If unsure, say N.
  1673. choice
  1674. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1675. depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
  1676. default ZBOOT_ROM_NONE
  1677. help
  1678. Include experimental SD/MMC loading code in the ROM-able zImage.
  1679. With this enabled it is possible to write the ROM-able zImage
  1680. kernel image to an MMC or SD card and boot the kernel straight
  1681. from the reset vector. At reset the processor Mask ROM will load
  1682. the first part of the ROM-able zImage which in turn loads the
  1683. rest the kernel image to RAM.
  1684. config ZBOOT_ROM_NONE
  1685. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1686. help
  1687. Do not load image from SD or MMC
  1688. config ZBOOT_ROM_MMCIF
  1689. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1690. help
  1691. Load image from MMCIF hardware block.
  1692. config ZBOOT_ROM_SH_MOBILE_SDHI
  1693. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1694. help
  1695. Load image from SDHI hardware block
  1696. endchoice
  1697. config ARM_APPENDED_DTB
  1698. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1699. depends on OF && !ZBOOT_ROM && EXPERIMENTAL
  1700. help
  1701. With this option, the boot code will look for a device tree binary
  1702. (DTB) appended to zImage
  1703. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1704. This is meant as a backward compatibility convenience for those
  1705. systems with a bootloader that can't be upgraded to accommodate
  1706. the documented boot protocol using a device tree.
  1707. Beware that there is very little in terms of protection against
  1708. this option being confused by leftover garbage in memory that might
  1709. look like a DTB header after a reboot if no actual DTB is appended
  1710. to zImage. Do not leave this option active in a production kernel
  1711. if you don't intend to always append a DTB. Proper passing of the
  1712. location into r2 of a bootloader provided DTB is always preferable
  1713. to this option.
  1714. config ARM_ATAG_DTB_COMPAT
  1715. bool "Supplement the appended DTB with traditional ATAG information"
  1716. depends on ARM_APPENDED_DTB
  1717. help
  1718. Some old bootloaders can't be updated to a DTB capable one, yet
  1719. they provide ATAGs with memory configuration, the ramdisk address,
  1720. the kernel cmdline string, etc. Such information is dynamically
  1721. provided by the bootloader and can't always be stored in a static
  1722. DTB. To allow a device tree enabled kernel to be used with such
  1723. bootloaders, this option allows zImage to extract the information
  1724. from the ATAG list and store it at run time into the appended DTB.
  1725. choice
  1726. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1727. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1728. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1729. bool "Use bootloader kernel arguments if available"
  1730. help
  1731. Uses the command-line options passed by the boot loader instead of
  1732. the device tree bootargs property. If the boot loader doesn't provide
  1733. any, the device tree bootargs property will be used.
  1734. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1735. bool "Extend with bootloader kernel arguments"
  1736. help
  1737. The command-line arguments provided by the boot loader will be
  1738. appended to the the device tree bootargs property.
  1739. endchoice
  1740. config CMDLINE
  1741. string "Default kernel command string"
  1742. default ""
  1743. help
  1744. On some architectures (EBSA110 and CATS), there is currently no way
  1745. for the boot loader to pass arguments to the kernel. For these
  1746. architectures, you should supply some command-line options at build
  1747. time by entering them here. As a minimum, you should specify the
  1748. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1749. choice
  1750. prompt "Kernel command line type" if CMDLINE != ""
  1751. default CMDLINE_FROM_BOOTLOADER
  1752. config CMDLINE_FROM_BOOTLOADER
  1753. bool "Use bootloader kernel arguments if available"
  1754. help
  1755. Uses the command-line options passed by the boot loader. If
  1756. the boot loader doesn't provide any, the default kernel command
  1757. string provided in CMDLINE will be used.
  1758. config CMDLINE_EXTEND
  1759. bool "Extend bootloader kernel arguments"
  1760. help
  1761. The command-line arguments provided by the boot loader will be
  1762. appended to the default kernel command string.
  1763. config CMDLINE_FORCE
  1764. bool "Always use the default kernel command string"
  1765. help
  1766. Always use the default kernel command string, even if the boot
  1767. loader passes other arguments to the kernel.
  1768. This is useful if you cannot or don't want to change the
  1769. command-line options your boot loader passes to the kernel.
  1770. endchoice
  1771. config XIP_KERNEL
  1772. bool "Kernel Execute-In-Place from ROM"
  1773. depends on !ZBOOT_ROM && !ARM_LPAE
  1774. help
  1775. Execute-In-Place allows the kernel to run from non-volatile storage
  1776. directly addressable by the CPU, such as NOR flash. This saves RAM
  1777. space since the text section of the kernel is not loaded from flash
  1778. to RAM. Read-write sections, such as the data section and stack,
  1779. are still copied to RAM. The XIP kernel is not compressed since
  1780. it has to run directly from flash, so it will take more space to
  1781. store it. The flash address used to link the kernel object files,
  1782. and for storing it, is configuration dependent. Therefore, if you
  1783. say Y here, you must know the proper physical address where to
  1784. store the kernel image depending on your own flash memory usage.
  1785. Also note that the make target becomes "make xipImage" rather than
  1786. "make zImage" or "make Image". The final kernel binary to put in
  1787. ROM memory will be arch/arm/boot/xipImage.
  1788. If unsure, say N.
  1789. config XIP_PHYS_ADDR
  1790. hex "XIP Kernel Physical Location"
  1791. depends on XIP_KERNEL
  1792. default "0x00080000"
  1793. help
  1794. This is the physical address in your flash memory the kernel will
  1795. be linked for and stored to. This address is dependent on your
  1796. own flash usage.
  1797. config KEXEC
  1798. bool "Kexec system call (EXPERIMENTAL)"
  1799. depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
  1800. help
  1801. kexec is a system call that implements the ability to shutdown your
  1802. current kernel, and to start another kernel. It is like a reboot
  1803. but it is independent of the system firmware. And like a reboot
  1804. you can start any kernel with it, not just Linux.
  1805. It is an ongoing process to be certain the hardware in a machine
  1806. is properly shutdown, so do not be surprised if this code does not
  1807. initially work for you. It may help to enable device hotplugging
  1808. support.
  1809. config ATAGS_PROC
  1810. bool "Export atags in procfs"
  1811. depends on KEXEC
  1812. default y
  1813. help
  1814. Should the atags used to boot the kernel be exported in an "atags"
  1815. file in procfs. Useful with kexec.
  1816. config CRASH_DUMP
  1817. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1818. depends on EXPERIMENTAL
  1819. help
  1820. Generate crash dump after being started by kexec. This should
  1821. be normally only set in special crash dump kernels which are
  1822. loaded in the main kernel with kexec-tools into a specially
  1823. reserved region and then later executed after a crash by
  1824. kdump/kexec. The crash dump kernel must be compiled to a
  1825. memory address not used by the main kernel
  1826. For more details see Documentation/kdump/kdump.txt
  1827. config AUTO_ZRELADDR
  1828. bool "Auto calculation of the decompressed kernel image address"
  1829. depends on !ZBOOT_ROM && !ARCH_U300
  1830. help
  1831. ZRELADDR is the physical address where the decompressed kernel
  1832. image will be placed. If AUTO_ZRELADDR is selected, the address
  1833. will be determined at run-time by masking the current IP with
  1834. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1835. from start of memory.
  1836. endmenu
  1837. menu "CPU Power Management"
  1838. if ARCH_HAS_CPUFREQ
  1839. source "drivers/cpufreq/Kconfig"
  1840. config CPU_FREQ_IMX
  1841. tristate "CPUfreq driver for i.MX CPUs"
  1842. depends on ARCH_MXC && CPU_FREQ
  1843. help
  1844. This enables the CPUfreq driver for i.MX CPUs.
  1845. config CPU_FREQ_SA1100
  1846. bool
  1847. config CPU_FREQ_SA1110
  1848. bool
  1849. config CPU_FREQ_INTEGRATOR
  1850. tristate "CPUfreq driver for ARM Integrator CPUs"
  1851. depends on ARCH_INTEGRATOR && CPU_FREQ
  1852. default y
  1853. help
  1854. This enables the CPUfreq driver for ARM Integrator CPUs.
  1855. For details, take a look at <file:Documentation/cpu-freq>.
  1856. If in doubt, say Y.
  1857. config CPU_FREQ_PXA
  1858. bool
  1859. depends on CPU_FREQ && ARCH_PXA && PXA25x
  1860. default y
  1861. select CPU_FREQ_TABLE
  1862. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  1863. config CPU_FREQ_S3C
  1864. bool
  1865. help
  1866. Internal configuration node for common cpufreq on Samsung SoC
  1867. config CPU_FREQ_S3C24XX
  1868. bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
  1869. depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
  1870. select CPU_FREQ_S3C
  1871. help
  1872. This enables the CPUfreq driver for the Samsung S3C24XX family
  1873. of CPUs.
  1874. For details, take a look at <file:Documentation/cpu-freq>.
  1875. If in doubt, say N.
  1876. config CPU_FREQ_S3C24XX_PLL
  1877. bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
  1878. depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
  1879. help
  1880. Compile in support for changing the PLL frequency from the
  1881. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1882. after a frequency change, so by default it is not enabled.
  1883. This also means that the PLL tables for the selected CPU(s) will
  1884. be built which may increase the size of the kernel image.
  1885. config CPU_FREQ_S3C24XX_DEBUG
  1886. bool "Debug CPUfreq Samsung driver core"
  1887. depends on CPU_FREQ_S3C24XX
  1888. help
  1889. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1890. config CPU_FREQ_S3C24XX_IODEBUG
  1891. bool "Debug CPUfreq Samsung driver IO timing"
  1892. depends on CPU_FREQ_S3C24XX
  1893. help
  1894. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1895. config CPU_FREQ_S3C24XX_DEBUGFS
  1896. bool "Export debugfs for CPUFreq"
  1897. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1898. help
  1899. Export status information via debugfs.
  1900. endif
  1901. source "drivers/cpuidle/Kconfig"
  1902. endmenu
  1903. menu "Floating point emulation"
  1904. comment "At least one emulation must be selected"
  1905. config FPE_NWFPE
  1906. bool "NWFPE math emulation"
  1907. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1908. ---help---
  1909. Say Y to include the NWFPE floating point emulator in the kernel.
  1910. This is necessary to run most binaries. Linux does not currently
  1911. support floating point hardware so you need to say Y here even if
  1912. your machine has an FPA or floating point co-processor podule.
  1913. You may say N here if you are going to load the Acorn FPEmulator
  1914. early in the bootup.
  1915. config FPE_NWFPE_XP
  1916. bool "Support extended precision"
  1917. depends on FPE_NWFPE
  1918. help
  1919. Say Y to include 80-bit support in the kernel floating-point
  1920. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1921. Note that gcc does not generate 80-bit operations by default,
  1922. so in most cases this option only enlarges the size of the
  1923. floating point emulator without any good reason.
  1924. You almost surely want to say N here.
  1925. config FPE_FASTFPE
  1926. bool "FastFPE math emulation (EXPERIMENTAL)"
  1927. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  1928. ---help---
  1929. Say Y here to include the FAST floating point emulator in the kernel.
  1930. This is an experimental much faster emulator which now also has full
  1931. precision for the mantissa. It does not support any exceptions.
  1932. It is very simple, and approximately 3-6 times faster than NWFPE.
  1933. It should be sufficient for most programs. It may be not suitable
  1934. for scientific calculations, but you have to check this for yourself.
  1935. If you do not feel you need a faster FP emulation you should better
  1936. choose NWFPE.
  1937. config VFP
  1938. bool "VFP-format floating point maths"
  1939. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1940. help
  1941. Say Y to include VFP support code in the kernel. This is needed
  1942. if your hardware includes a VFP unit.
  1943. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1944. release notes and additional status information.
  1945. Say N if your target does not have VFP hardware.
  1946. config VFPv3
  1947. bool
  1948. depends on VFP
  1949. default y if CPU_V7
  1950. config NEON
  1951. bool "Advanced SIMD (NEON) Extension support"
  1952. depends on VFPv3 && CPU_V7
  1953. help
  1954. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1955. Extension.
  1956. endmenu
  1957. menu "Userspace binary formats"
  1958. source "fs/Kconfig.binfmt"
  1959. config ARTHUR
  1960. tristate "RISC OS personality"
  1961. depends on !AEABI
  1962. help
  1963. Say Y here to include the kernel code necessary if you want to run
  1964. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1965. experimental; if this sounds frightening, say N and sleep in peace.
  1966. You can also say M here to compile this support as a module (which
  1967. will be called arthur).
  1968. endmenu
  1969. menu "Power management options"
  1970. source "kernel/power/Kconfig"
  1971. config ARCH_SUSPEND_POSSIBLE
  1972. depends on !ARCH_S5PC100 && !ARCH_TEGRA
  1973. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1974. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1975. def_bool y
  1976. config ARM_CPU_SUSPEND
  1977. def_bool PM_SLEEP
  1978. endmenu
  1979. source "net/Kconfig"
  1980. source "drivers/Kconfig"
  1981. source "fs/Kconfig"
  1982. source "arch/arm/Kconfig.debug"
  1983. source "security/Kconfig"
  1984. source "crypto/Kconfig"
  1985. source "lib/Kconfig"