Kconfig 65 KB

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  1. config ARM
  2. bool
  3. default y
  4. select HAVE_AOUT
  5. select HAVE_DMA_API_DEBUG
  6. select HAVE_IDE if PCI || ISA || PCMCIA
  7. select HAVE_MEMBLOCK
  8. select RTC_LIB
  9. select SYS_SUPPORTS_APM_EMULATION
  10. select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
  11. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  12. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  13. select HAVE_ARCH_KGDB
  14. select HAVE_KPROBES if !XIP_KERNEL
  15. select HAVE_KRETPROBES if (HAVE_KPROBES)
  16. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  17. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  18. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  19. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  20. select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  21. select HAVE_GENERIC_DMA_COHERENT
  22. select HAVE_KERNEL_GZIP
  23. select HAVE_KERNEL_LZO
  24. select HAVE_KERNEL_LZMA
  25. select HAVE_KERNEL_XZ
  26. select HAVE_IRQ_WORK
  27. select HAVE_PERF_EVENTS
  28. select PERF_USE_VMALLOC
  29. select HAVE_REGS_AND_STACK_ACCESS_API
  30. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  31. select HAVE_C_RECORDMCOUNT
  32. select HAVE_GENERIC_HARDIRQS
  33. select GENERIC_IRQ_SHOW
  34. select CPU_PM if (SUSPEND || CPU_IDLE)
  35. select GENERIC_PCI_IOMAP
  36. select HAVE_BPF_JIT if NET
  37. help
  38. The ARM series is a line of low-power-consumption RISC chip designs
  39. licensed by ARM Ltd and targeted at embedded applications and
  40. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  41. manufactured, but legacy ARM-based PC hardware remains popular in
  42. Europe. There is an ARM Linux project with a web page at
  43. <http://www.arm.linux.org.uk/>.
  44. config ARM_HAS_SG_CHAIN
  45. bool
  46. config HAVE_PWM
  47. bool
  48. config MIGHT_HAVE_PCI
  49. bool
  50. config SYS_SUPPORTS_APM_EMULATION
  51. bool
  52. config GENERIC_GPIO
  53. bool
  54. config ARCH_USES_GETTIMEOFFSET
  55. bool
  56. default n
  57. config GENERIC_CLOCKEVENTS
  58. bool
  59. config GENERIC_CLOCKEVENTS_BROADCAST
  60. bool
  61. depends on GENERIC_CLOCKEVENTS
  62. default y if SMP
  63. config KTIME_SCALAR
  64. bool
  65. default y
  66. config HAVE_TCM
  67. bool
  68. select GENERIC_ALLOCATOR
  69. config HAVE_PROC_CPU
  70. bool
  71. config NO_IOPORT
  72. bool
  73. config EISA
  74. bool
  75. ---help---
  76. The Extended Industry Standard Architecture (EISA) bus was
  77. developed as an open alternative to the IBM MicroChannel bus.
  78. The EISA bus provided some of the features of the IBM MicroChannel
  79. bus while maintaining backward compatibility with cards made for
  80. the older ISA bus. The EISA bus saw limited use between 1988 and
  81. 1995 when it was made obsolete by the PCI bus.
  82. Say Y here if you are building a kernel for an EISA-based machine.
  83. Otherwise, say N.
  84. config SBUS
  85. bool
  86. config MCA
  87. bool
  88. help
  89. MicroChannel Architecture is found in some IBM PS/2 machines and
  90. laptops. It is a bus system similar to PCI or ISA. See
  91. <file:Documentation/mca.txt> (and especially the web page given
  92. there) before attempting to build an MCA bus kernel.
  93. config STACKTRACE_SUPPORT
  94. bool
  95. default y
  96. config HAVE_LATENCYTOP_SUPPORT
  97. bool
  98. depends on !SMP
  99. default y
  100. config LOCKDEP_SUPPORT
  101. bool
  102. default y
  103. config TRACE_IRQFLAGS_SUPPORT
  104. bool
  105. default y
  106. config HARDIRQS_SW_RESEND
  107. bool
  108. default y
  109. config GENERIC_IRQ_PROBE
  110. bool
  111. default y
  112. config GENERIC_LOCKBREAK
  113. bool
  114. default y
  115. depends on SMP && PREEMPT
  116. config RWSEM_GENERIC_SPINLOCK
  117. bool
  118. default y
  119. config RWSEM_XCHGADD_ALGORITHM
  120. bool
  121. config ARCH_HAS_ILOG2_U32
  122. bool
  123. config ARCH_HAS_ILOG2_U64
  124. bool
  125. config ARCH_HAS_CPUFREQ
  126. bool
  127. help
  128. Internal node to signify that the ARCH has CPUFREQ support
  129. and that the relevant menu configurations are displayed for
  130. it.
  131. config ARCH_HAS_CPU_IDLE_WAIT
  132. def_bool y
  133. config GENERIC_HWEIGHT
  134. bool
  135. default y
  136. config GENERIC_CALIBRATE_DELAY
  137. bool
  138. default y
  139. config ARCH_MAY_HAVE_PC_FDC
  140. bool
  141. config ZONE_DMA
  142. bool
  143. config NEED_DMA_MAP_STATE
  144. def_bool y
  145. config ARCH_HAS_DMA_SET_COHERENT_MASK
  146. bool
  147. config GENERIC_ISA_DMA
  148. bool
  149. config FIQ
  150. bool
  151. config NEED_RET_TO_USER
  152. bool
  153. config ARCH_MTD_XIP
  154. bool
  155. config VECTORS_BASE
  156. hex
  157. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  158. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  159. default 0x00000000
  160. help
  161. The base address of exception vectors.
  162. config ARM_PATCH_PHYS_VIRT
  163. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  164. default y
  165. depends on !XIP_KERNEL && MMU
  166. depends on !ARCH_REALVIEW || !SPARSEMEM
  167. help
  168. Patch phys-to-virt and virt-to-phys translation functions at
  169. boot and module load time according to the position of the
  170. kernel in system memory.
  171. This can only be used with non-XIP MMU kernels where the base
  172. of physical memory is at a 16MB boundary.
  173. Only disable this option if you know that you do not require
  174. this feature (eg, building a kernel for a single machine) and
  175. you need to shrink the kernel to the minimal size.
  176. config NEED_MACH_IO_H
  177. bool
  178. help
  179. Select this when mach/io.h is required to provide special
  180. definitions for this platform. The need for mach/io.h should
  181. be avoided when possible.
  182. config NEED_MACH_MEMORY_H
  183. bool
  184. help
  185. Select this when mach/memory.h is required to provide special
  186. definitions for this platform. The need for mach/memory.h should
  187. be avoided when possible.
  188. config PHYS_OFFSET
  189. hex "Physical address of main memory" if MMU
  190. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  191. default DRAM_BASE if !MMU
  192. help
  193. Please provide the physical address corresponding to the
  194. location of main memory in your system.
  195. config GENERIC_BUG
  196. def_bool y
  197. depends on BUG
  198. source "init/Kconfig"
  199. source "kernel/Kconfig.freezer"
  200. menu "System Type"
  201. config MMU
  202. bool "MMU-based Paged Memory Management Support"
  203. default y
  204. help
  205. Select if you want MMU-based virtualised addressing space
  206. support by paged memory management. If unsure, say 'Y'.
  207. #
  208. # The "ARM system type" choice list is ordered alphabetically by option
  209. # text. Please add new entries in the option alphabetic order.
  210. #
  211. choice
  212. prompt "ARM system type"
  213. default ARCH_VERSATILE
  214. config ARCH_INTEGRATOR
  215. bool "ARM Ltd. Integrator family"
  216. select ARM_AMBA
  217. select ARCH_HAS_CPUFREQ
  218. select CLKDEV_LOOKUP
  219. select HAVE_MACH_CLKDEV
  220. select HAVE_TCM
  221. select ICST
  222. select GENERIC_CLOCKEVENTS
  223. select PLAT_VERSATILE
  224. select PLAT_VERSATILE_FPGA_IRQ
  225. select NEED_MACH_IO_H
  226. select NEED_MACH_MEMORY_H
  227. select SPARSE_IRQ
  228. help
  229. Support for ARM's Integrator platform.
  230. config ARCH_REALVIEW
  231. bool "ARM Ltd. RealView family"
  232. select ARM_AMBA
  233. select CLKDEV_LOOKUP
  234. select HAVE_MACH_CLKDEV
  235. select ICST
  236. select GENERIC_CLOCKEVENTS
  237. select ARCH_WANT_OPTIONAL_GPIOLIB
  238. select PLAT_VERSATILE
  239. select PLAT_VERSATILE_CLCD
  240. select ARM_TIMER_SP804
  241. select GPIO_PL061 if GPIOLIB
  242. select NEED_MACH_MEMORY_H
  243. help
  244. This enables support for ARM Ltd RealView boards.
  245. config ARCH_VERSATILE
  246. bool "ARM Ltd. Versatile family"
  247. select ARM_AMBA
  248. select ARM_VIC
  249. select CLKDEV_LOOKUP
  250. select HAVE_MACH_CLKDEV
  251. select ICST
  252. select GENERIC_CLOCKEVENTS
  253. select ARCH_WANT_OPTIONAL_GPIOLIB
  254. select PLAT_VERSATILE
  255. select PLAT_VERSATILE_CLCD
  256. select PLAT_VERSATILE_FPGA_IRQ
  257. select ARM_TIMER_SP804
  258. help
  259. This enables support for ARM Ltd Versatile board.
  260. config ARCH_VEXPRESS
  261. bool "ARM Ltd. Versatile Express family"
  262. select ARCH_WANT_OPTIONAL_GPIOLIB
  263. select ARM_AMBA
  264. select ARM_TIMER_SP804
  265. select CLKDEV_LOOKUP
  266. select HAVE_MACH_CLKDEV
  267. select GENERIC_CLOCKEVENTS
  268. select HAVE_CLK
  269. select HAVE_PATA_PLATFORM
  270. select ICST
  271. select NO_IOPORT
  272. select PLAT_VERSATILE
  273. select PLAT_VERSATILE_CLCD
  274. help
  275. This enables support for the ARM Ltd Versatile Express boards.
  276. config ARCH_AT91
  277. bool "Atmel AT91"
  278. select ARCH_REQUIRE_GPIOLIB
  279. select HAVE_CLK
  280. select CLKDEV_LOOKUP
  281. select IRQ_DOMAIN
  282. select NEED_MACH_IO_H if PCCARD
  283. help
  284. This enables support for systems based on Atmel
  285. AT91RM9200 and AT91SAM9* processors.
  286. config ARCH_BCMRING
  287. bool "Broadcom BCMRING"
  288. depends on MMU
  289. select CPU_V6
  290. select ARM_AMBA
  291. select ARM_TIMER_SP804
  292. select CLKDEV_LOOKUP
  293. select GENERIC_CLOCKEVENTS
  294. select ARCH_WANT_OPTIONAL_GPIOLIB
  295. help
  296. Support for Broadcom's BCMRing platform.
  297. config ARCH_HIGHBANK
  298. bool "Calxeda Highbank-based"
  299. select ARCH_WANT_OPTIONAL_GPIOLIB
  300. select ARM_AMBA
  301. select ARM_GIC
  302. select ARM_TIMER_SP804
  303. select CACHE_L2X0
  304. select CLKDEV_LOOKUP
  305. select CPU_V7
  306. select GENERIC_CLOCKEVENTS
  307. select HAVE_ARM_SCU
  308. select HAVE_SMP
  309. select SPARSE_IRQ
  310. select USE_OF
  311. help
  312. Support for the Calxeda Highbank SoC based boards.
  313. config ARCH_CLPS711X
  314. bool "Cirrus Logic CLPS711x/EP721x-based"
  315. select CPU_ARM720T
  316. select ARCH_USES_GETTIMEOFFSET
  317. select NEED_MACH_MEMORY_H
  318. help
  319. Support for Cirrus Logic 711x/721x based boards.
  320. config ARCH_CNS3XXX
  321. bool "Cavium Networks CNS3XXX family"
  322. select CPU_V6K
  323. select GENERIC_CLOCKEVENTS
  324. select ARM_GIC
  325. select MIGHT_HAVE_CACHE_L2X0
  326. select MIGHT_HAVE_PCI
  327. select PCI_DOMAINS if PCI
  328. help
  329. Support for Cavium Networks CNS3XXX platform.
  330. config ARCH_GEMINI
  331. bool "Cortina Systems Gemini"
  332. select CPU_FA526
  333. select ARCH_REQUIRE_GPIOLIB
  334. select ARCH_USES_GETTIMEOFFSET
  335. help
  336. Support for the Cortina Systems Gemini family SoCs
  337. config ARCH_PRIMA2
  338. bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
  339. select CPU_V7
  340. select NO_IOPORT
  341. select GENERIC_CLOCKEVENTS
  342. select CLKDEV_LOOKUP
  343. select GENERIC_IRQ_CHIP
  344. select MIGHT_HAVE_CACHE_L2X0
  345. select USE_OF
  346. select ZONE_DMA
  347. help
  348. Support for CSR SiRFSoC ARM Cortex A9 Platform
  349. config ARCH_EBSA110
  350. bool "EBSA-110"
  351. select CPU_SA110
  352. select ISA
  353. select NO_IOPORT
  354. select ARCH_USES_GETTIMEOFFSET
  355. select NEED_MACH_IO_H
  356. select NEED_MACH_MEMORY_H
  357. help
  358. This is an evaluation board for the StrongARM processor available
  359. from Digital. It has limited hardware on-board, including an
  360. Ethernet interface, two PCMCIA sockets, two serial ports and a
  361. parallel port.
  362. config ARCH_EP93XX
  363. bool "EP93xx-based"
  364. select CPU_ARM920T
  365. select ARM_AMBA
  366. select ARM_VIC
  367. select CLKDEV_LOOKUP
  368. select ARCH_REQUIRE_GPIOLIB
  369. select ARCH_HAS_HOLES_MEMORYMODEL
  370. select ARCH_USES_GETTIMEOFFSET
  371. select NEED_MACH_MEMORY_H
  372. help
  373. This enables support for the Cirrus EP93xx series of CPUs.
  374. config ARCH_FOOTBRIDGE
  375. bool "FootBridge"
  376. select CPU_SA110
  377. select FOOTBRIDGE
  378. select GENERIC_CLOCKEVENTS
  379. select HAVE_IDE
  380. select NEED_MACH_IO_H
  381. select NEED_MACH_MEMORY_H
  382. help
  383. Support for systems based on the DC21285 companion chip
  384. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  385. config ARCH_MXC
  386. bool "Freescale MXC/iMX-based"
  387. select GENERIC_CLOCKEVENTS
  388. select ARCH_REQUIRE_GPIOLIB
  389. select CLKDEV_LOOKUP
  390. select CLKSRC_MMIO
  391. select GENERIC_IRQ_CHIP
  392. select MULTI_IRQ_HANDLER
  393. help
  394. Support for Freescale MXC/iMX-based family of processors
  395. config ARCH_MXS
  396. bool "Freescale MXS-based"
  397. select GENERIC_CLOCKEVENTS
  398. select ARCH_REQUIRE_GPIOLIB
  399. select CLKDEV_LOOKUP
  400. select CLKSRC_MMIO
  401. select HAVE_CLK_PREPARE
  402. help
  403. Support for Freescale MXS-based family of processors
  404. config ARCH_NETX
  405. bool "Hilscher NetX based"
  406. select CLKSRC_MMIO
  407. select CPU_ARM926T
  408. select ARM_VIC
  409. select GENERIC_CLOCKEVENTS
  410. help
  411. This enables support for systems based on the Hilscher NetX Soc
  412. config ARCH_H720X
  413. bool "Hynix HMS720x-based"
  414. select CPU_ARM720T
  415. select ISA_DMA_API
  416. select ARCH_USES_GETTIMEOFFSET
  417. help
  418. This enables support for systems based on the Hynix HMS720x
  419. config ARCH_IOP13XX
  420. bool "IOP13xx-based"
  421. depends on MMU
  422. select CPU_XSC3
  423. select PLAT_IOP
  424. select PCI
  425. select ARCH_SUPPORTS_MSI
  426. select VMSPLIT_1G
  427. select NEED_MACH_IO_H
  428. select NEED_MACH_MEMORY_H
  429. select NEED_RET_TO_USER
  430. help
  431. Support for Intel's IOP13XX (XScale) family of processors.
  432. config ARCH_IOP32X
  433. bool "IOP32x-based"
  434. depends on MMU
  435. select CPU_XSCALE
  436. select NEED_MACH_IO_H
  437. select NEED_RET_TO_USER
  438. select PLAT_IOP
  439. select PCI
  440. select ARCH_REQUIRE_GPIOLIB
  441. help
  442. Support for Intel's 80219 and IOP32X (XScale) family of
  443. processors.
  444. config ARCH_IOP33X
  445. bool "IOP33x-based"
  446. depends on MMU
  447. select CPU_XSCALE
  448. select NEED_MACH_IO_H
  449. select NEED_RET_TO_USER
  450. select PLAT_IOP
  451. select PCI
  452. select ARCH_REQUIRE_GPIOLIB
  453. help
  454. Support for Intel's IOP33X (XScale) family of processors.
  455. config ARCH_IXP23XX
  456. bool "IXP23XX-based"
  457. depends on MMU
  458. select CPU_XSC3
  459. select PCI
  460. select ARCH_USES_GETTIMEOFFSET
  461. select NEED_MACH_IO_H
  462. select NEED_MACH_MEMORY_H
  463. help
  464. Support for Intel's IXP23xx (XScale) family of processors.
  465. config ARCH_IXP2000
  466. bool "IXP2400/2800-based"
  467. depends on MMU
  468. select CPU_XSCALE
  469. select PCI
  470. select ARCH_USES_GETTIMEOFFSET
  471. select NEED_MACH_IO_H
  472. select NEED_MACH_MEMORY_H
  473. help
  474. Support for Intel's IXP2400/2800 (XScale) family of processors.
  475. config ARCH_IXP4XX
  476. bool "IXP4xx-based"
  477. depends on MMU
  478. select ARCH_HAS_DMA_SET_COHERENT_MASK
  479. select CLKSRC_MMIO
  480. select CPU_XSCALE
  481. select GENERIC_GPIO
  482. select GENERIC_CLOCKEVENTS
  483. select MIGHT_HAVE_PCI
  484. select NEED_MACH_IO_H
  485. select DMABOUNCE if PCI
  486. help
  487. Support for Intel's IXP4XX (XScale) family of processors.
  488. config ARCH_DOVE
  489. bool "Marvell Dove"
  490. select CPU_V7
  491. select PCI
  492. select ARCH_REQUIRE_GPIOLIB
  493. select GENERIC_CLOCKEVENTS
  494. select NEED_MACH_IO_H
  495. select PLAT_ORION
  496. help
  497. Support for the Marvell Dove SoC 88AP510
  498. config ARCH_KIRKWOOD
  499. bool "Marvell Kirkwood"
  500. select CPU_FEROCEON
  501. select PCI
  502. select ARCH_REQUIRE_GPIOLIB
  503. select GENERIC_CLOCKEVENTS
  504. select NEED_MACH_IO_H
  505. select PLAT_ORION
  506. help
  507. Support for the following Marvell Kirkwood series SoCs:
  508. 88F6180, 88F6192 and 88F6281.
  509. config ARCH_LPC32XX
  510. bool "NXP LPC32XX"
  511. select CLKSRC_MMIO
  512. select CPU_ARM926T
  513. select ARCH_REQUIRE_GPIOLIB
  514. select HAVE_IDE
  515. select ARM_AMBA
  516. select USB_ARCH_HAS_OHCI
  517. select CLKDEV_LOOKUP
  518. select GENERIC_CLOCKEVENTS
  519. select USE_OF
  520. help
  521. Support for the NXP LPC32XX family of processors
  522. config ARCH_MV78XX0
  523. bool "Marvell MV78xx0"
  524. select CPU_FEROCEON
  525. select PCI
  526. select ARCH_REQUIRE_GPIOLIB
  527. select GENERIC_CLOCKEVENTS
  528. select NEED_MACH_IO_H
  529. select PLAT_ORION
  530. help
  531. Support for the following Marvell MV78xx0 series SoCs:
  532. MV781x0, MV782x0.
  533. config ARCH_ORION5X
  534. bool "Marvell Orion"
  535. depends on MMU
  536. select CPU_FEROCEON
  537. select PCI
  538. select ARCH_REQUIRE_GPIOLIB
  539. select GENERIC_CLOCKEVENTS
  540. select PLAT_ORION
  541. help
  542. Support for the following Marvell Orion 5x series SoCs:
  543. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  544. Orion-2 (5281), Orion-1-90 (6183).
  545. config ARCH_MMP
  546. bool "Marvell PXA168/910/MMP2"
  547. depends on MMU
  548. select ARCH_REQUIRE_GPIOLIB
  549. select CLKDEV_LOOKUP
  550. select GENERIC_CLOCKEVENTS
  551. select GPIO_PXA
  552. select IRQ_DOMAIN
  553. select TICK_ONESHOT
  554. select PLAT_PXA
  555. select SPARSE_IRQ
  556. select GENERIC_ALLOCATOR
  557. help
  558. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  559. config ARCH_KS8695
  560. bool "Micrel/Kendin KS8695"
  561. select CPU_ARM922T
  562. select ARCH_REQUIRE_GPIOLIB
  563. select ARCH_USES_GETTIMEOFFSET
  564. select NEED_MACH_MEMORY_H
  565. help
  566. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  567. System-on-Chip devices.
  568. config ARCH_W90X900
  569. bool "Nuvoton W90X900 CPU"
  570. select CPU_ARM926T
  571. select ARCH_REQUIRE_GPIOLIB
  572. select CLKDEV_LOOKUP
  573. select CLKSRC_MMIO
  574. select GENERIC_CLOCKEVENTS
  575. help
  576. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  577. At present, the w90x900 has been renamed nuc900, regarding
  578. the ARM series product line, you can login the following
  579. link address to know more.
  580. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  581. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  582. config ARCH_TEGRA
  583. bool "NVIDIA Tegra"
  584. select CLKDEV_LOOKUP
  585. select CLKSRC_MMIO
  586. select GENERIC_CLOCKEVENTS
  587. select GENERIC_GPIO
  588. select HAVE_CLK
  589. select HAVE_SMP
  590. select MIGHT_HAVE_CACHE_L2X0
  591. select NEED_MACH_IO_H if PCI
  592. select ARCH_HAS_CPUFREQ
  593. help
  594. This enables support for NVIDIA Tegra based systems (Tegra APX,
  595. Tegra 6xx and Tegra 2 series).
  596. config ARCH_PICOXCELL
  597. bool "Picochip picoXcell"
  598. select ARCH_REQUIRE_GPIOLIB
  599. select ARM_PATCH_PHYS_VIRT
  600. select ARM_VIC
  601. select CPU_V6K
  602. select DW_APB_TIMER
  603. select GENERIC_CLOCKEVENTS
  604. select GENERIC_GPIO
  605. select HAVE_TCM
  606. select NO_IOPORT
  607. select SPARSE_IRQ
  608. select USE_OF
  609. help
  610. This enables support for systems based on the Picochip picoXcell
  611. family of Femtocell devices. The picoxcell support requires device tree
  612. for all boards.
  613. config ARCH_PNX4008
  614. bool "Philips Nexperia PNX4008 Mobile"
  615. select CPU_ARM926T
  616. select CLKDEV_LOOKUP
  617. select ARCH_USES_GETTIMEOFFSET
  618. help
  619. This enables support for Philips PNX4008 mobile platform.
  620. config ARCH_PXA
  621. bool "PXA2xx/PXA3xx-based"
  622. depends on MMU
  623. select ARCH_MTD_XIP
  624. select ARCH_HAS_CPUFREQ
  625. select CLKDEV_LOOKUP
  626. select CLKSRC_MMIO
  627. select ARCH_REQUIRE_GPIOLIB
  628. select GENERIC_CLOCKEVENTS
  629. select GPIO_PXA
  630. select TICK_ONESHOT
  631. select PLAT_PXA
  632. select SPARSE_IRQ
  633. select AUTO_ZRELADDR
  634. select MULTI_IRQ_HANDLER
  635. select ARM_CPU_SUSPEND if PM
  636. select HAVE_IDE
  637. help
  638. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  639. config ARCH_MSM
  640. bool "Qualcomm MSM"
  641. select HAVE_CLK
  642. select GENERIC_CLOCKEVENTS
  643. select ARCH_REQUIRE_GPIOLIB
  644. select CLKDEV_LOOKUP
  645. help
  646. Support for Qualcomm MSM/QSD based systems. This runs on the
  647. apps processor of the MSM/QSD and depends on a shared memory
  648. interface to the modem processor which runs the baseband
  649. stack and controls some vital subsystems
  650. (clock and power control, etc).
  651. config ARCH_SHMOBILE
  652. bool "Renesas SH-Mobile / R-Mobile"
  653. select HAVE_CLK
  654. select CLKDEV_LOOKUP
  655. select HAVE_MACH_CLKDEV
  656. select HAVE_SMP
  657. select GENERIC_CLOCKEVENTS
  658. select MIGHT_HAVE_CACHE_L2X0
  659. select NO_IOPORT
  660. select SPARSE_IRQ
  661. select MULTI_IRQ_HANDLER
  662. select PM_GENERIC_DOMAINS if PM
  663. select NEED_MACH_MEMORY_H
  664. help
  665. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  666. config ARCH_RPC
  667. bool "RiscPC"
  668. select ARCH_ACORN
  669. select FIQ
  670. select ARCH_MAY_HAVE_PC_FDC
  671. select HAVE_PATA_PLATFORM
  672. select ISA_DMA_API
  673. select NO_IOPORT
  674. select ARCH_SPARSEMEM_ENABLE
  675. select ARCH_USES_GETTIMEOFFSET
  676. select HAVE_IDE
  677. select NEED_MACH_IO_H
  678. select NEED_MACH_MEMORY_H
  679. help
  680. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  681. CD-ROM interface, serial and parallel port, and the floppy drive.
  682. config ARCH_SA1100
  683. bool "SA1100-based"
  684. select CLKSRC_MMIO
  685. select CPU_SA1100
  686. select ISA
  687. select ARCH_SPARSEMEM_ENABLE
  688. select ARCH_MTD_XIP
  689. select ARCH_HAS_CPUFREQ
  690. select CPU_FREQ
  691. select GENERIC_CLOCKEVENTS
  692. select CLKDEV_LOOKUP
  693. select TICK_ONESHOT
  694. select ARCH_REQUIRE_GPIOLIB
  695. select HAVE_IDE
  696. select NEED_MACH_MEMORY_H
  697. select SPARSE_IRQ
  698. help
  699. Support for StrongARM 11x0 based boards.
  700. config ARCH_S3C24XX
  701. bool "Samsung S3C24XX SoCs"
  702. select GENERIC_GPIO
  703. select ARCH_HAS_CPUFREQ
  704. select HAVE_CLK
  705. select CLKDEV_LOOKUP
  706. select ARCH_USES_GETTIMEOFFSET
  707. select HAVE_S3C2410_I2C if I2C
  708. select HAVE_S3C_RTC if RTC_CLASS
  709. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  710. select NEED_MACH_IO_H
  711. help
  712. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  713. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  714. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  715. Samsung SMDK2410 development board (and derivatives).
  716. config ARCH_S3C64XX
  717. bool "Samsung S3C64XX"
  718. select PLAT_SAMSUNG
  719. select CPU_V6
  720. select ARM_VIC
  721. select HAVE_CLK
  722. select HAVE_TCM
  723. select CLKDEV_LOOKUP
  724. select NO_IOPORT
  725. select ARCH_USES_GETTIMEOFFSET
  726. select ARCH_HAS_CPUFREQ
  727. select ARCH_REQUIRE_GPIOLIB
  728. select SAMSUNG_CLKSRC
  729. select SAMSUNG_IRQ_VIC_TIMER
  730. select S3C_GPIO_TRACK
  731. select S3C_DEV_NAND
  732. select USB_ARCH_HAS_OHCI
  733. select SAMSUNG_GPIOLIB_4BIT
  734. select HAVE_S3C2410_I2C if I2C
  735. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  736. help
  737. Samsung S3C64XX series based systems
  738. config ARCH_S5P64X0
  739. bool "Samsung S5P6440 S5P6450"
  740. select CPU_V6
  741. select GENERIC_GPIO
  742. select HAVE_CLK
  743. select CLKDEV_LOOKUP
  744. select CLKSRC_MMIO
  745. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  746. select GENERIC_CLOCKEVENTS
  747. select HAVE_S3C2410_I2C if I2C
  748. select HAVE_S3C_RTC if RTC_CLASS
  749. help
  750. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  751. SMDK6450.
  752. config ARCH_S5PC100
  753. bool "Samsung S5PC100"
  754. select GENERIC_GPIO
  755. select HAVE_CLK
  756. select CLKDEV_LOOKUP
  757. select CPU_V7
  758. select ARCH_USES_GETTIMEOFFSET
  759. select HAVE_S3C2410_I2C if I2C
  760. select HAVE_S3C_RTC if RTC_CLASS
  761. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  762. help
  763. Samsung S5PC100 series based systems
  764. config ARCH_S5PV210
  765. bool "Samsung S5PV210/S5PC110"
  766. select CPU_V7
  767. select ARCH_SPARSEMEM_ENABLE
  768. select ARCH_HAS_HOLES_MEMORYMODEL
  769. select GENERIC_GPIO
  770. select HAVE_CLK
  771. select CLKDEV_LOOKUP
  772. select CLKSRC_MMIO
  773. select ARCH_HAS_CPUFREQ
  774. select GENERIC_CLOCKEVENTS
  775. select HAVE_S3C2410_I2C if I2C
  776. select HAVE_S3C_RTC if RTC_CLASS
  777. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  778. select NEED_MACH_MEMORY_H
  779. help
  780. Samsung S5PV210/S5PC110 series based systems
  781. config ARCH_EXYNOS
  782. bool "SAMSUNG EXYNOS"
  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 ARCH_HAS_CPUFREQ
  790. select GENERIC_CLOCKEVENTS
  791. select HAVE_S3C_RTC if RTC_CLASS
  792. select HAVE_S3C2410_I2C if I2C
  793. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  794. select NEED_MACH_MEMORY_H
  795. help
  796. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  797. config ARCH_SHARK
  798. bool "Shark"
  799. select CPU_SA110
  800. select ISA
  801. select ISA_DMA
  802. select ZONE_DMA
  803. select PCI
  804. select ARCH_USES_GETTIMEOFFSET
  805. select NEED_MACH_MEMORY_H
  806. select NEED_MACH_IO_H
  807. help
  808. Support for the StrongARM based Digital DNARD machine, also known
  809. as "Shark" (<http://www.shark-linux.de/shark.html>).
  810. config ARCH_U300
  811. bool "ST-Ericsson U300 Series"
  812. depends on MMU
  813. select CLKSRC_MMIO
  814. select CPU_ARM926T
  815. select HAVE_TCM
  816. select ARM_AMBA
  817. select ARM_PATCH_PHYS_VIRT
  818. select ARM_VIC
  819. select GENERIC_CLOCKEVENTS
  820. select CLKDEV_LOOKUP
  821. select HAVE_MACH_CLKDEV
  822. select GENERIC_GPIO
  823. select ARCH_REQUIRE_GPIOLIB
  824. help
  825. Support for ST-Ericsson U300 series mobile platforms.
  826. config ARCH_U8500
  827. bool "ST-Ericsson U8500 Series"
  828. depends on MMU
  829. select CPU_V7
  830. select ARM_AMBA
  831. select GENERIC_CLOCKEVENTS
  832. select CLKDEV_LOOKUP
  833. select ARCH_REQUIRE_GPIOLIB
  834. select ARCH_HAS_CPUFREQ
  835. select HAVE_SMP
  836. select MIGHT_HAVE_CACHE_L2X0
  837. help
  838. Support for ST-Ericsson's Ux500 architecture
  839. config ARCH_NOMADIK
  840. bool "STMicroelectronics Nomadik"
  841. select ARM_AMBA
  842. select ARM_VIC
  843. select CPU_ARM926T
  844. select CLKDEV_LOOKUP
  845. select GENERIC_CLOCKEVENTS
  846. select MIGHT_HAVE_CACHE_L2X0
  847. select ARCH_REQUIRE_GPIOLIB
  848. help
  849. Support for the Nomadik platform by ST-Ericsson
  850. config ARCH_DAVINCI
  851. bool "TI DaVinci"
  852. select GENERIC_CLOCKEVENTS
  853. select ARCH_REQUIRE_GPIOLIB
  854. select ZONE_DMA
  855. select HAVE_IDE
  856. select CLKDEV_LOOKUP
  857. select GENERIC_ALLOCATOR
  858. select GENERIC_IRQ_CHIP
  859. select ARCH_HAS_HOLES_MEMORYMODEL
  860. help
  861. Support for TI's DaVinci platform.
  862. config ARCH_OMAP
  863. bool "TI OMAP"
  864. select HAVE_CLK
  865. select ARCH_REQUIRE_GPIOLIB
  866. select ARCH_HAS_CPUFREQ
  867. select CLKSRC_MMIO
  868. select GENERIC_CLOCKEVENTS
  869. select ARCH_HAS_HOLES_MEMORYMODEL
  870. help
  871. Support for TI's OMAP platform (OMAP1/2/3/4).
  872. config PLAT_SPEAR
  873. bool "ST SPEAr"
  874. select ARM_AMBA
  875. select ARCH_REQUIRE_GPIOLIB
  876. select CLKDEV_LOOKUP
  877. select CLKSRC_MMIO
  878. select GENERIC_CLOCKEVENTS
  879. select HAVE_CLK
  880. help
  881. Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
  882. config ARCH_VT8500
  883. bool "VIA/WonderMedia 85xx"
  884. select CPU_ARM926T
  885. select GENERIC_GPIO
  886. select ARCH_HAS_CPUFREQ
  887. select GENERIC_CLOCKEVENTS
  888. select ARCH_REQUIRE_GPIOLIB
  889. select HAVE_PWM
  890. help
  891. Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
  892. config ARCH_ZYNQ
  893. bool "Xilinx Zynq ARM Cortex A9 Platform"
  894. select CPU_V7
  895. select GENERIC_CLOCKEVENTS
  896. select CLKDEV_LOOKUP
  897. select ARM_GIC
  898. select ARM_AMBA
  899. select ICST
  900. select MIGHT_HAVE_CACHE_L2X0
  901. select USE_OF
  902. help
  903. Support for Xilinx Zynq ARM Cortex A9 Platform
  904. endchoice
  905. #
  906. # This is sorted alphabetically by mach-* pathname. However, plat-*
  907. # Kconfigs may be included either alphabetically (according to the
  908. # plat- suffix) or along side the corresponding mach-* source.
  909. #
  910. source "arch/arm/mach-at91/Kconfig"
  911. source "arch/arm/mach-bcmring/Kconfig"
  912. source "arch/arm/mach-clps711x/Kconfig"
  913. source "arch/arm/mach-cns3xxx/Kconfig"
  914. source "arch/arm/mach-davinci/Kconfig"
  915. source "arch/arm/mach-dove/Kconfig"
  916. source "arch/arm/mach-ep93xx/Kconfig"
  917. source "arch/arm/mach-footbridge/Kconfig"
  918. source "arch/arm/mach-gemini/Kconfig"
  919. source "arch/arm/mach-h720x/Kconfig"
  920. source "arch/arm/mach-integrator/Kconfig"
  921. source "arch/arm/mach-iop32x/Kconfig"
  922. source "arch/arm/mach-iop33x/Kconfig"
  923. source "arch/arm/mach-iop13xx/Kconfig"
  924. source "arch/arm/mach-ixp4xx/Kconfig"
  925. source "arch/arm/mach-ixp2000/Kconfig"
  926. source "arch/arm/mach-ixp23xx/Kconfig"
  927. source "arch/arm/mach-kirkwood/Kconfig"
  928. source "arch/arm/mach-ks8695/Kconfig"
  929. source "arch/arm/mach-lpc32xx/Kconfig"
  930. source "arch/arm/mach-msm/Kconfig"
  931. source "arch/arm/mach-mv78xx0/Kconfig"
  932. source "arch/arm/plat-mxc/Kconfig"
  933. source "arch/arm/mach-mxs/Kconfig"
  934. source "arch/arm/mach-netx/Kconfig"
  935. source "arch/arm/mach-nomadik/Kconfig"
  936. source "arch/arm/plat-nomadik/Kconfig"
  937. source "arch/arm/plat-omap/Kconfig"
  938. source "arch/arm/mach-omap1/Kconfig"
  939. source "arch/arm/mach-omap2/Kconfig"
  940. source "arch/arm/mach-orion5x/Kconfig"
  941. source "arch/arm/mach-pxa/Kconfig"
  942. source "arch/arm/plat-pxa/Kconfig"
  943. source "arch/arm/mach-mmp/Kconfig"
  944. source "arch/arm/mach-realview/Kconfig"
  945. source "arch/arm/mach-sa1100/Kconfig"
  946. source "arch/arm/plat-samsung/Kconfig"
  947. source "arch/arm/plat-s3c24xx/Kconfig"
  948. source "arch/arm/plat-s5p/Kconfig"
  949. source "arch/arm/plat-spear/Kconfig"
  950. source "arch/arm/mach-s3c24xx/Kconfig"
  951. if ARCH_S3C24XX
  952. source "arch/arm/mach-s3c2412/Kconfig"
  953. source "arch/arm/mach-s3c2440/Kconfig"
  954. endif
  955. if ARCH_S3C64XX
  956. source "arch/arm/mach-s3c64xx/Kconfig"
  957. endif
  958. source "arch/arm/mach-s5p64x0/Kconfig"
  959. source "arch/arm/mach-s5pc100/Kconfig"
  960. source "arch/arm/mach-s5pv210/Kconfig"
  961. source "arch/arm/mach-exynos/Kconfig"
  962. source "arch/arm/mach-shmobile/Kconfig"
  963. source "arch/arm/mach-tegra/Kconfig"
  964. source "arch/arm/mach-u300/Kconfig"
  965. source "arch/arm/mach-ux500/Kconfig"
  966. source "arch/arm/mach-versatile/Kconfig"
  967. source "arch/arm/mach-vexpress/Kconfig"
  968. source "arch/arm/plat-versatile/Kconfig"
  969. source "arch/arm/mach-vt8500/Kconfig"
  970. source "arch/arm/mach-w90x900/Kconfig"
  971. # Definitions to make life easier
  972. config ARCH_ACORN
  973. bool
  974. config PLAT_IOP
  975. bool
  976. select GENERIC_CLOCKEVENTS
  977. config PLAT_ORION
  978. bool
  979. select CLKSRC_MMIO
  980. select GENERIC_IRQ_CHIP
  981. config PLAT_PXA
  982. bool
  983. config PLAT_VERSATILE
  984. bool
  985. config ARM_TIMER_SP804
  986. bool
  987. select CLKSRC_MMIO
  988. select HAVE_SCHED_CLOCK
  989. source arch/arm/mm/Kconfig
  990. config ARM_NR_BANKS
  991. int
  992. default 16 if ARCH_EP93XX
  993. default 8
  994. config IWMMXT
  995. bool "Enable iWMMXt support"
  996. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  997. default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
  998. help
  999. Enable support for iWMMXt context switching at run time if
  1000. running on a CPU that supports it.
  1001. config XSCALE_PMU
  1002. bool
  1003. depends on CPU_XSCALE
  1004. default y
  1005. config CPU_HAS_PMU
  1006. depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
  1007. (!ARCH_OMAP3 || OMAP3_EMU)
  1008. default y
  1009. bool
  1010. config MULTI_IRQ_HANDLER
  1011. bool
  1012. help
  1013. Allow each machine to specify it's own IRQ handler at run time.
  1014. if !MMU
  1015. source "arch/arm/Kconfig-nommu"
  1016. endif
  1017. config ARM_ERRATA_411920
  1018. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  1019. depends on CPU_V6 || CPU_V6K
  1020. help
  1021. Invalidation of the Instruction Cache operation can
  1022. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  1023. It does not affect the MPCore. This option enables the ARM Ltd.
  1024. recommended workaround.
  1025. config ARM_ERRATA_430973
  1026. bool "ARM errata: Stale prediction on replaced interworking branch"
  1027. depends on CPU_V7
  1028. help
  1029. This option enables the workaround for the 430973 Cortex-A8
  1030. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  1031. interworking branch is replaced with another code sequence at the
  1032. same virtual address, whether due to self-modifying code or virtual
  1033. to physical address re-mapping, Cortex-A8 does not recover from the
  1034. stale interworking branch prediction. This results in Cortex-A8
  1035. executing the new code sequence in the incorrect ARM or Thumb state.
  1036. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  1037. and also flushes the branch target cache at every context switch.
  1038. Note that setting specific bits in the ACTLR register may not be
  1039. available in non-secure mode.
  1040. config ARM_ERRATA_458693
  1041. bool "ARM errata: Processor deadlock when a false hazard is created"
  1042. depends on CPU_V7
  1043. help
  1044. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  1045. erratum. For very specific sequences of memory operations, it is
  1046. possible for a hazard condition intended for a cache line to instead
  1047. be incorrectly associated with a different cache line. This false
  1048. hazard might then cause a processor deadlock. The workaround enables
  1049. the L1 caching of the NEON accesses and disables the PLD instruction
  1050. in the ACTLR register. Note that setting specific bits in the ACTLR
  1051. register may not be available in non-secure mode.
  1052. config ARM_ERRATA_460075
  1053. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  1054. depends on CPU_V7
  1055. help
  1056. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  1057. erratum. Any asynchronous access to the L2 cache may encounter a
  1058. situation in which recent store transactions to the L2 cache are lost
  1059. and overwritten with stale memory contents from external memory. The
  1060. workaround disables the write-allocate mode for the L2 cache via the
  1061. ACTLR register. Note that setting specific bits in the ACTLR register
  1062. may not be available in non-secure mode.
  1063. config ARM_ERRATA_742230
  1064. bool "ARM errata: DMB operation may be faulty"
  1065. depends on CPU_V7 && SMP
  1066. help
  1067. This option enables the workaround for the 742230 Cortex-A9
  1068. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  1069. between two write operations may not ensure the correct visibility
  1070. ordering of the two writes. This workaround sets a specific bit in
  1071. the diagnostic register of the Cortex-A9 which causes the DMB
  1072. instruction to behave as a DSB, ensuring the correct behaviour of
  1073. the two writes.
  1074. config ARM_ERRATA_742231
  1075. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  1076. depends on CPU_V7 && SMP
  1077. help
  1078. This option enables the workaround for the 742231 Cortex-A9
  1079. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  1080. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  1081. accessing some data located in the same cache line, may get corrupted
  1082. data due to bad handling of the address hazard when the line gets
  1083. replaced from one of the CPUs at the same time as another CPU is
  1084. accessing it. This workaround sets specific bits in the diagnostic
  1085. register of the Cortex-A9 which reduces the linefill issuing
  1086. capabilities of the processor.
  1087. config PL310_ERRATA_588369
  1088. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  1089. depends on CACHE_L2X0
  1090. help
  1091. The PL310 L2 cache controller implements three types of Clean &
  1092. Invalidate maintenance operations: by Physical Address
  1093. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1094. They are architecturally defined to behave as the execution of a
  1095. clean operation followed immediately by an invalidate operation,
  1096. both performing to the same memory location. This functionality
  1097. is not correctly implemented in PL310 as clean lines are not
  1098. invalidated as a result of these operations.
  1099. config ARM_ERRATA_720789
  1100. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1101. depends on CPU_V7
  1102. help
  1103. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1104. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1105. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1106. As a consequence of this erratum, some TLB entries which should be
  1107. invalidated are not, resulting in an incoherency in the system page
  1108. tables. The workaround changes the TLB flushing routines to invalidate
  1109. entries regardless of the ASID.
  1110. config PL310_ERRATA_727915
  1111. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1112. depends on CACHE_L2X0
  1113. help
  1114. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1115. operation (offset 0x7FC). This operation runs in background so that
  1116. PL310 can handle normal accesses while it is in progress. Under very
  1117. rare circumstances, due to this erratum, write data can be lost when
  1118. PL310 treats a cacheable write transaction during a Clean &
  1119. Invalidate by Way operation.
  1120. config ARM_ERRATA_743622
  1121. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1122. depends on CPU_V7
  1123. help
  1124. This option enables the workaround for the 743622 Cortex-A9
  1125. (r2p*) erratum. Under very rare conditions, a faulty
  1126. optimisation in the Cortex-A9 Store Buffer may lead to data
  1127. corruption. This workaround sets a specific bit in the diagnostic
  1128. register of the Cortex-A9 which disables the Store Buffer
  1129. optimisation, preventing the defect from occurring. This has no
  1130. visible impact on the overall performance or power consumption of the
  1131. processor.
  1132. config ARM_ERRATA_751472
  1133. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1134. depends on CPU_V7
  1135. help
  1136. This option enables the workaround for the 751472 Cortex-A9 (prior
  1137. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1138. completion of a following broadcasted operation if the second
  1139. operation is received by a CPU before the ICIALLUIS has completed,
  1140. potentially leading to corrupted entries in the cache or TLB.
  1141. config PL310_ERRATA_753970
  1142. bool "PL310 errata: cache sync operation may be faulty"
  1143. depends on CACHE_PL310
  1144. help
  1145. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1146. Under some condition the effect of cache sync operation on
  1147. the store buffer still remains when the operation completes.
  1148. This means that the store buffer is always asked to drain and
  1149. this prevents it from merging any further writes. The workaround
  1150. is to replace the normal offset of cache sync operation (0x730)
  1151. by another offset targeting an unmapped PL310 register 0x740.
  1152. This has the same effect as the cache sync operation: store buffer
  1153. drain and waiting for all buffers empty.
  1154. config ARM_ERRATA_754322
  1155. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1156. depends on CPU_V7
  1157. help
  1158. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1159. r3p*) erratum. A speculative memory access may cause a page table walk
  1160. which starts prior to an ASID switch but completes afterwards. This
  1161. can populate the micro-TLB with a stale entry which may be hit with
  1162. the new ASID. This workaround places two dsb instructions in the mm
  1163. switching code so that no page table walks can cross the ASID switch.
  1164. config ARM_ERRATA_754327
  1165. bool "ARM errata: no automatic Store Buffer drain"
  1166. depends on CPU_V7 && SMP
  1167. help
  1168. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1169. r2p0) erratum. The Store Buffer does not have any automatic draining
  1170. mechanism and therefore a livelock may occur if an external agent
  1171. continuously polls a memory location waiting to observe an update.
  1172. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1173. written polling loops from denying visibility of updates to memory.
  1174. config ARM_ERRATA_364296
  1175. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1176. depends on CPU_V6 && !SMP
  1177. help
  1178. This options enables the workaround for the 364296 ARM1136
  1179. r0p2 erratum (possible cache data corruption with
  1180. hit-under-miss enabled). It sets the undocumented bit 31 in
  1181. the auxiliary control register and the FI bit in the control
  1182. register, thus disabling hit-under-miss without putting the
  1183. processor into full low interrupt latency mode. ARM11MPCore
  1184. is not affected.
  1185. config ARM_ERRATA_764369
  1186. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1187. depends on CPU_V7 && SMP
  1188. help
  1189. This option enables the workaround for erratum 764369
  1190. affecting Cortex-A9 MPCore with two or more processors (all
  1191. current revisions). Under certain timing circumstances, a data
  1192. cache line maintenance operation by MVA targeting an Inner
  1193. Shareable memory region may fail to proceed up to either the
  1194. Point of Coherency or to the Point of Unification of the
  1195. system. This workaround adds a DSB instruction before the
  1196. relevant cache maintenance functions and sets a specific bit
  1197. in the diagnostic control register of the SCU.
  1198. config PL310_ERRATA_769419
  1199. bool "PL310 errata: no automatic Store Buffer drain"
  1200. depends on CACHE_L2X0
  1201. help
  1202. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1203. not automatically drain. This can cause normal, non-cacheable
  1204. writes to be retained when the memory system is idle, leading
  1205. to suboptimal I/O performance for drivers using coherent DMA.
  1206. This option adds a write barrier to the cpu_idle loop so that,
  1207. on systems with an outer cache, the store buffer is drained
  1208. explicitly.
  1209. endmenu
  1210. source "arch/arm/common/Kconfig"
  1211. menu "Bus support"
  1212. config ARM_AMBA
  1213. bool
  1214. config ISA
  1215. bool
  1216. help
  1217. Find out whether you have ISA slots on your motherboard. ISA is the
  1218. name of a bus system, i.e. the way the CPU talks to the other stuff
  1219. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1220. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1221. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1222. # Select ISA DMA controller support
  1223. config ISA_DMA
  1224. bool
  1225. select ISA_DMA_API
  1226. # Select ISA DMA interface
  1227. config ISA_DMA_API
  1228. bool
  1229. config PCI
  1230. bool "PCI support" if MIGHT_HAVE_PCI
  1231. help
  1232. Find out whether you have a PCI motherboard. PCI is the name of a
  1233. bus system, i.e. the way the CPU talks to the other stuff inside
  1234. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1235. VESA. If you have PCI, say Y, otherwise N.
  1236. config PCI_DOMAINS
  1237. bool
  1238. depends on PCI
  1239. config PCI_NANOENGINE
  1240. bool "BSE nanoEngine PCI support"
  1241. depends on SA1100_NANOENGINE
  1242. help
  1243. Enable PCI on the BSE nanoEngine board.
  1244. config PCI_SYSCALL
  1245. def_bool PCI
  1246. # Select the host bridge type
  1247. config PCI_HOST_VIA82C505
  1248. bool
  1249. depends on PCI && ARCH_SHARK
  1250. default y
  1251. config PCI_HOST_ITE8152
  1252. bool
  1253. depends on PCI && MACH_ARMCORE
  1254. default y
  1255. select DMABOUNCE
  1256. source "drivers/pci/Kconfig"
  1257. source "drivers/pcmcia/Kconfig"
  1258. endmenu
  1259. menu "Kernel Features"
  1260. source "kernel/time/Kconfig"
  1261. config HAVE_SMP
  1262. bool
  1263. help
  1264. This option should be selected by machines which have an SMP-
  1265. capable CPU.
  1266. The only effect of this option is to make the SMP-related
  1267. options available to the user for configuration.
  1268. config SMP
  1269. bool "Symmetric Multi-Processing"
  1270. depends on CPU_V6K || CPU_V7
  1271. depends on GENERIC_CLOCKEVENTS
  1272. depends on HAVE_SMP
  1273. depends on MMU
  1274. select USE_GENERIC_SMP_HELPERS
  1275. select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
  1276. help
  1277. This enables support for systems with more than one CPU. If you have
  1278. a system with only one CPU, like most personal computers, say N. If
  1279. you have a system with more than one CPU, say Y.
  1280. If you say N here, the kernel will run on single and multiprocessor
  1281. machines, but will use only one CPU of a multiprocessor machine. If
  1282. you say Y here, the kernel will run on many, but not all, single
  1283. processor machines. On a single processor machine, the kernel will
  1284. run faster if you say N here.
  1285. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1286. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1287. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1288. If you don't know what to do here, say N.
  1289. config SMP_ON_UP
  1290. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1291. depends on EXPERIMENTAL
  1292. depends on SMP && !XIP_KERNEL
  1293. default y
  1294. help
  1295. SMP kernels contain instructions which fail on non-SMP processors.
  1296. Enabling this option allows the kernel to modify itself to make
  1297. these instructions safe. Disabling it allows about 1K of space
  1298. savings.
  1299. If you don't know what to do here, say Y.
  1300. config ARM_CPU_TOPOLOGY
  1301. bool "Support cpu topology definition"
  1302. depends on SMP && CPU_V7
  1303. default y
  1304. help
  1305. Support ARM cpu topology definition. The MPIDR register defines
  1306. affinity between processors which is then used to describe the cpu
  1307. topology of an ARM System.
  1308. config SCHED_MC
  1309. bool "Multi-core scheduler support"
  1310. depends on ARM_CPU_TOPOLOGY
  1311. help
  1312. Multi-core scheduler support improves the CPU scheduler's decision
  1313. making when dealing with multi-core CPU chips at a cost of slightly
  1314. increased overhead in some places. If unsure say N here.
  1315. config SCHED_SMT
  1316. bool "SMT scheduler support"
  1317. depends on ARM_CPU_TOPOLOGY
  1318. help
  1319. Improves the CPU scheduler's decision making when dealing with
  1320. MultiThreading at a cost of slightly increased overhead in some
  1321. places. If unsure say N here.
  1322. config HAVE_ARM_SCU
  1323. bool
  1324. help
  1325. This option enables support for the ARM system coherency unit
  1326. config HAVE_ARM_TWD
  1327. bool
  1328. depends on SMP
  1329. select TICK_ONESHOT
  1330. help
  1331. This options enables support for the ARM timer and watchdog unit
  1332. choice
  1333. prompt "Memory split"
  1334. default VMSPLIT_3G
  1335. help
  1336. Select the desired split between kernel and user memory.
  1337. If you are not absolutely sure what you are doing, leave this
  1338. option alone!
  1339. config VMSPLIT_3G
  1340. bool "3G/1G user/kernel split"
  1341. config VMSPLIT_2G
  1342. bool "2G/2G user/kernel split"
  1343. config VMSPLIT_1G
  1344. bool "1G/3G user/kernel split"
  1345. endchoice
  1346. config PAGE_OFFSET
  1347. hex
  1348. default 0x40000000 if VMSPLIT_1G
  1349. default 0x80000000 if VMSPLIT_2G
  1350. default 0xC0000000
  1351. config NR_CPUS
  1352. int "Maximum number of CPUs (2-32)"
  1353. range 2 32
  1354. depends on SMP
  1355. default "4"
  1356. config HOTPLUG_CPU
  1357. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  1358. depends on SMP && HOTPLUG && EXPERIMENTAL
  1359. help
  1360. Say Y here to experiment with turning CPUs off and on. CPUs
  1361. can be controlled through /sys/devices/system/cpu.
  1362. config LOCAL_TIMERS
  1363. bool "Use local timer interrupts"
  1364. depends on SMP
  1365. default y
  1366. select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
  1367. help
  1368. Enable support for local timers on SMP platforms, rather then the
  1369. legacy IPI broadcast method. Local timers allows the system
  1370. accounting to be spread across the timer interval, preventing a
  1371. "thundering herd" at every timer tick.
  1372. config ARCH_NR_GPIO
  1373. int
  1374. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1375. default 355 if ARCH_U8500
  1376. default 264 if MACH_H4700
  1377. default 0
  1378. help
  1379. Maximum number of GPIOs in the system.
  1380. If unsure, leave the default value.
  1381. source kernel/Kconfig.preempt
  1382. config HZ
  1383. int
  1384. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1385. ARCH_S5PV210 || ARCH_EXYNOS4
  1386. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  1387. default AT91_TIMER_HZ if ARCH_AT91
  1388. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1389. default 100
  1390. config THUMB2_KERNEL
  1391. bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
  1392. depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
  1393. select AEABI
  1394. select ARM_ASM_UNIFIED
  1395. select ARM_UNWIND
  1396. help
  1397. By enabling this option, the kernel will be compiled in
  1398. Thumb-2 mode. A compiler/assembler that understand the unified
  1399. ARM-Thumb syntax is needed.
  1400. If unsure, say N.
  1401. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1402. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1403. depends on THUMB2_KERNEL && MODULES
  1404. default y
  1405. help
  1406. Various binutils versions can resolve Thumb-2 branches to
  1407. locally-defined, preemptible global symbols as short-range "b.n"
  1408. branch instructions.
  1409. This is a problem, because there's no guarantee the final
  1410. destination of the symbol, or any candidate locations for a
  1411. trampoline, are within range of the branch. For this reason, the
  1412. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1413. relocation in modules at all, and it makes little sense to add
  1414. support.
  1415. The symptom is that the kernel fails with an "unsupported
  1416. relocation" error when loading some modules.
  1417. Until fixed tools are available, passing
  1418. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1419. code which hits this problem, at the cost of a bit of extra runtime
  1420. stack usage in some cases.
  1421. The problem is described in more detail at:
  1422. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1423. Only Thumb-2 kernels are affected.
  1424. Unless you are sure your tools don't have this problem, say Y.
  1425. config ARM_ASM_UNIFIED
  1426. bool
  1427. config AEABI
  1428. bool "Use the ARM EABI to compile the kernel"
  1429. help
  1430. This option allows for the kernel to be compiled using the latest
  1431. ARM ABI (aka EABI). This is only useful if you are using a user
  1432. space environment that is also compiled with EABI.
  1433. Since there are major incompatibilities between the legacy ABI and
  1434. EABI, especially with regard to structure member alignment, this
  1435. option also changes the kernel syscall calling convention to
  1436. disambiguate both ABIs and allow for backward compatibility support
  1437. (selected with CONFIG_OABI_COMPAT).
  1438. To use this you need GCC version 4.0.0 or later.
  1439. config OABI_COMPAT
  1440. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1441. depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
  1442. default y
  1443. help
  1444. This option preserves the old syscall interface along with the
  1445. new (ARM EABI) one. It also provides a compatibility layer to
  1446. intercept syscalls that have structure arguments which layout
  1447. in memory differs between the legacy ABI and the new ARM EABI
  1448. (only for non "thumb" binaries). This option adds a tiny
  1449. overhead to all syscalls and produces a slightly larger kernel.
  1450. If you know you'll be using only pure EABI user space then you
  1451. can say N here. If this option is not selected and you attempt
  1452. to execute a legacy ABI binary then the result will be
  1453. UNPREDICTABLE (in fact it can be predicted that it won't work
  1454. at all). If in doubt say Y.
  1455. config ARCH_HAS_HOLES_MEMORYMODEL
  1456. bool
  1457. config ARCH_SPARSEMEM_ENABLE
  1458. bool
  1459. config ARCH_SPARSEMEM_DEFAULT
  1460. def_bool ARCH_SPARSEMEM_ENABLE
  1461. config ARCH_SELECT_MEMORY_MODEL
  1462. def_bool ARCH_SPARSEMEM_ENABLE
  1463. config HAVE_ARCH_PFN_VALID
  1464. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1465. config HIGHMEM
  1466. bool "High Memory Support"
  1467. depends on MMU
  1468. help
  1469. The address space of ARM processors is only 4 Gigabytes large
  1470. and it has to accommodate user address space, kernel address
  1471. space as well as some memory mapped IO. That means that, if you
  1472. have a large amount of physical memory and/or IO, not all of the
  1473. memory can be "permanently mapped" by the kernel. The physical
  1474. memory that is not permanently mapped is called "high memory".
  1475. Depending on the selected kernel/user memory split, minimum
  1476. vmalloc space and actual amount of RAM, you may not need this
  1477. option which should result in a slightly faster kernel.
  1478. If unsure, say n.
  1479. config HIGHPTE
  1480. bool "Allocate 2nd-level pagetables from highmem"
  1481. depends on HIGHMEM
  1482. config HW_PERF_EVENTS
  1483. bool "Enable hardware performance counter support for perf events"
  1484. depends on PERF_EVENTS && CPU_HAS_PMU
  1485. default y
  1486. help
  1487. Enable hardware performance counter support for perf events. If
  1488. disabled, perf events will use software events only.
  1489. source "mm/Kconfig"
  1490. config FORCE_MAX_ZONEORDER
  1491. int "Maximum zone order" if ARCH_SHMOBILE
  1492. range 11 64 if ARCH_SHMOBILE
  1493. default "9" if SA1111
  1494. default "11"
  1495. help
  1496. The kernel memory allocator divides physically contiguous memory
  1497. blocks into "zones", where each zone is a power of two number of
  1498. pages. This option selects the largest power of two that the kernel
  1499. keeps in the memory allocator. If you need to allocate very large
  1500. blocks of physically contiguous memory, then you may need to
  1501. increase this value.
  1502. This config option is actually maximum order plus one. For example,
  1503. a value of 11 means that the largest free memory block is 2^10 pages.
  1504. config LEDS
  1505. bool "Timer and CPU usage LEDs"
  1506. depends on ARCH_CDB89712 || ARCH_EBSA110 || \
  1507. ARCH_EBSA285 || ARCH_INTEGRATOR || \
  1508. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  1509. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  1510. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  1511. ARCH_AT91 || ARCH_DAVINCI || \
  1512. ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
  1513. help
  1514. If you say Y here, the LEDs on your machine will be used
  1515. to provide useful information about your current system status.
  1516. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  1517. be able to select which LEDs are active using the options below. If
  1518. you are compiling a kernel for the EBSA-110 or the LART however, the
  1519. red LED will simply flash regularly to indicate that the system is
  1520. still functional. It is safe to say Y here if you have a CATS
  1521. system, but the driver will do nothing.
  1522. config LEDS_TIMER
  1523. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  1524. OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1525. || MACH_OMAP_PERSEUS2
  1526. depends on LEDS
  1527. depends on !GENERIC_CLOCKEVENTS
  1528. default y if ARCH_EBSA110
  1529. help
  1530. If you say Y here, one of the system LEDs (the green one on the
  1531. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  1532. will flash regularly to indicate that the system is still
  1533. operational. This is mainly useful to kernel hackers who are
  1534. debugging unstable kernels.
  1535. The LART uses the same LED for both Timer LED and CPU usage LED
  1536. functions. You may choose to use both, but the Timer LED function
  1537. will overrule the CPU usage LED.
  1538. config LEDS_CPU
  1539. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  1540. !ARCH_OMAP) \
  1541. || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1542. || MACH_OMAP_PERSEUS2
  1543. depends on LEDS
  1544. help
  1545. If you say Y here, the red LED will be used to give a good real
  1546. time indication of CPU usage, by lighting whenever the idle task
  1547. is not currently executing.
  1548. The LART uses the same LED for both Timer LED and CPU usage LED
  1549. functions. You may choose to use both, but the Timer LED function
  1550. will overrule the CPU usage LED.
  1551. config ALIGNMENT_TRAP
  1552. bool
  1553. depends on CPU_CP15_MMU
  1554. default y if !ARCH_EBSA110
  1555. select HAVE_PROC_CPU if PROC_FS
  1556. help
  1557. ARM processors cannot fetch/store information which is not
  1558. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1559. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1560. fetch/store instructions will be emulated in software if you say
  1561. here, which has a severe performance impact. This is necessary for
  1562. correct operation of some network protocols. With an IP-only
  1563. configuration it is safe to say N, otherwise say Y.
  1564. config UACCESS_WITH_MEMCPY
  1565. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
  1566. depends on MMU && EXPERIMENTAL
  1567. default y if CPU_FEROCEON
  1568. help
  1569. Implement faster copy_to_user and clear_user methods for CPU
  1570. cores where a 8-word STM instruction give significantly higher
  1571. memory write throughput than a sequence of individual 32bit stores.
  1572. A possible side effect is a slight increase in scheduling latency
  1573. between threads sharing the same address space if they invoke
  1574. such copy operations with large buffers.
  1575. However, if the CPU data cache is using a write-allocate mode,
  1576. this option is unlikely to provide any performance gain.
  1577. config SECCOMP
  1578. bool
  1579. prompt "Enable seccomp to safely compute untrusted bytecode"
  1580. ---help---
  1581. This kernel feature is useful for number crunching applications
  1582. that may need to compute untrusted bytecode during their
  1583. execution. By using pipes or other transports made available to
  1584. the process as file descriptors supporting the read/write
  1585. syscalls, it's possible to isolate those applications in
  1586. their own address space using seccomp. Once seccomp is
  1587. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1588. and the task is only allowed to execute a few safe syscalls
  1589. defined by each seccomp mode.
  1590. config CC_STACKPROTECTOR
  1591. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1592. depends on EXPERIMENTAL
  1593. help
  1594. This option turns on the -fstack-protector GCC feature. This
  1595. feature puts, at the beginning of functions, a canary value on
  1596. the stack just before the return address, and validates
  1597. the value just before actually returning. Stack based buffer
  1598. overflows (that need to overwrite this return address) now also
  1599. overwrite the canary, which gets detected and the attack is then
  1600. neutralized via a kernel panic.
  1601. This feature requires gcc version 4.2 or above.
  1602. config DEPRECATED_PARAM_STRUCT
  1603. bool "Provide old way to pass kernel parameters"
  1604. help
  1605. This was deprecated in 2001 and announced to live on for 5 years.
  1606. Some old boot loaders still use this way.
  1607. endmenu
  1608. menu "Boot options"
  1609. config USE_OF
  1610. bool "Flattened Device Tree support"
  1611. select OF
  1612. select OF_EARLY_FLATTREE
  1613. select IRQ_DOMAIN
  1614. help
  1615. Include support for flattened device tree machine descriptions.
  1616. # Compressed boot loader in ROM. Yes, we really want to ask about
  1617. # TEXT and BSS so we preserve their values in the config files.
  1618. config ZBOOT_ROM_TEXT
  1619. hex "Compressed ROM boot loader base address"
  1620. default "0"
  1621. help
  1622. The physical address at which the ROM-able zImage is to be
  1623. placed in the target. Platforms which normally make use of
  1624. ROM-able zImage formats normally set this to a suitable
  1625. value in their defconfig file.
  1626. If ZBOOT_ROM is not enabled, this has no effect.
  1627. config ZBOOT_ROM_BSS
  1628. hex "Compressed ROM boot loader BSS address"
  1629. default "0"
  1630. help
  1631. The base address of an area of read/write memory in the target
  1632. for the ROM-able zImage which must be available while the
  1633. decompressor is running. It must be large enough to hold the
  1634. entire decompressed kernel plus an additional 128 KiB.
  1635. Platforms which normally make use of ROM-able zImage formats
  1636. normally set this to a suitable value in their defconfig file.
  1637. If ZBOOT_ROM is not enabled, this has no effect.
  1638. config ZBOOT_ROM
  1639. bool "Compressed boot loader in ROM/flash"
  1640. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1641. help
  1642. Say Y here if you intend to execute your compressed kernel image
  1643. (zImage) directly from ROM or flash. If unsure, say N.
  1644. choice
  1645. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1646. depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
  1647. default ZBOOT_ROM_NONE
  1648. help
  1649. Include experimental SD/MMC loading code in the ROM-able zImage.
  1650. With this enabled it is possible to write the the ROM-able zImage
  1651. kernel image to an MMC or SD card and boot the kernel straight
  1652. from the reset vector. At reset the processor Mask ROM will load
  1653. the first part of the the ROM-able zImage which in turn loads the
  1654. rest the kernel image to RAM.
  1655. config ZBOOT_ROM_NONE
  1656. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1657. help
  1658. Do not load image from SD or MMC
  1659. config ZBOOT_ROM_MMCIF
  1660. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1661. help
  1662. Load image from MMCIF hardware block.
  1663. config ZBOOT_ROM_SH_MOBILE_SDHI
  1664. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1665. help
  1666. Load image from SDHI hardware block
  1667. endchoice
  1668. config ARM_APPENDED_DTB
  1669. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1670. depends on OF && !ZBOOT_ROM && EXPERIMENTAL
  1671. help
  1672. With this option, the boot code will look for a device tree binary
  1673. (DTB) appended to zImage
  1674. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1675. This is meant as a backward compatibility convenience for those
  1676. systems with a bootloader that can't be upgraded to accommodate
  1677. the documented boot protocol using a device tree.
  1678. Beware that there is very little in terms of protection against
  1679. this option being confused by leftover garbage in memory that might
  1680. look like a DTB header after a reboot if no actual DTB is appended
  1681. to zImage. Do not leave this option active in a production kernel
  1682. if you don't intend to always append a DTB. Proper passing of the
  1683. location into r2 of a bootloader provided DTB is always preferable
  1684. to this option.
  1685. config ARM_ATAG_DTB_COMPAT
  1686. bool "Supplement the appended DTB with traditional ATAG information"
  1687. depends on ARM_APPENDED_DTB
  1688. help
  1689. Some old bootloaders can't be updated to a DTB capable one, yet
  1690. they provide ATAGs with memory configuration, the ramdisk address,
  1691. the kernel cmdline string, etc. Such information is dynamically
  1692. provided by the bootloader and can't always be stored in a static
  1693. DTB. To allow a device tree enabled kernel to be used with such
  1694. bootloaders, this option allows zImage to extract the information
  1695. from the ATAG list and store it at run time into the appended DTB.
  1696. config CMDLINE
  1697. string "Default kernel command string"
  1698. default ""
  1699. help
  1700. On some architectures (EBSA110 and CATS), there is currently no way
  1701. for the boot loader to pass arguments to the kernel. For these
  1702. architectures, you should supply some command-line options at build
  1703. time by entering them here. As a minimum, you should specify the
  1704. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1705. choice
  1706. prompt "Kernel command line type" if CMDLINE != ""
  1707. default CMDLINE_FROM_BOOTLOADER
  1708. config CMDLINE_FROM_BOOTLOADER
  1709. bool "Use bootloader kernel arguments if available"
  1710. help
  1711. Uses the command-line options passed by the boot loader. If
  1712. the boot loader doesn't provide any, the default kernel command
  1713. string provided in CMDLINE will be used.
  1714. config CMDLINE_EXTEND
  1715. bool "Extend bootloader kernel arguments"
  1716. help
  1717. The command-line arguments provided by the boot loader will be
  1718. appended to the default kernel command string.
  1719. config CMDLINE_FORCE
  1720. bool "Always use the default kernel command string"
  1721. help
  1722. Always use the default kernel command string, even if the boot
  1723. loader passes other arguments to the kernel.
  1724. This is useful if you cannot or don't want to change the
  1725. command-line options your boot loader passes to the kernel.
  1726. endchoice
  1727. config XIP_KERNEL
  1728. bool "Kernel Execute-In-Place from ROM"
  1729. depends on !ZBOOT_ROM && !ARM_LPAE
  1730. help
  1731. Execute-In-Place allows the kernel to run from non-volatile storage
  1732. directly addressable by the CPU, such as NOR flash. This saves RAM
  1733. space since the text section of the kernel is not loaded from flash
  1734. to RAM. Read-write sections, such as the data section and stack,
  1735. are still copied to RAM. The XIP kernel is not compressed since
  1736. it has to run directly from flash, so it will take more space to
  1737. store it. The flash address used to link the kernel object files,
  1738. and for storing it, is configuration dependent. Therefore, if you
  1739. say Y here, you must know the proper physical address where to
  1740. store the kernel image depending on your own flash memory usage.
  1741. Also note that the make target becomes "make xipImage" rather than
  1742. "make zImage" or "make Image". The final kernel binary to put in
  1743. ROM memory will be arch/arm/boot/xipImage.
  1744. If unsure, say N.
  1745. config XIP_PHYS_ADDR
  1746. hex "XIP Kernel Physical Location"
  1747. depends on XIP_KERNEL
  1748. default "0x00080000"
  1749. help
  1750. This is the physical address in your flash memory the kernel will
  1751. be linked for and stored to. This address is dependent on your
  1752. own flash usage.
  1753. config KEXEC
  1754. bool "Kexec system call (EXPERIMENTAL)"
  1755. depends on EXPERIMENTAL && (!SMP || HOTPLUG_CPU)
  1756. help
  1757. kexec is a system call that implements the ability to shutdown your
  1758. current kernel, and to start another kernel. It is like a reboot
  1759. but it is independent of the system firmware. And like a reboot
  1760. you can start any kernel with it, not just Linux.
  1761. It is an ongoing process to be certain the hardware in a machine
  1762. is properly shutdown, so do not be surprised if this code does not
  1763. initially work for you. It may help to enable device hotplugging
  1764. support.
  1765. config ATAGS_PROC
  1766. bool "Export atags in procfs"
  1767. depends on KEXEC
  1768. default y
  1769. help
  1770. Should the atags used to boot the kernel be exported in an "atags"
  1771. file in procfs. Useful with kexec.
  1772. config CRASH_DUMP
  1773. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1774. depends on EXPERIMENTAL
  1775. help
  1776. Generate crash dump after being started by kexec. This should
  1777. be normally only set in special crash dump kernels which are
  1778. loaded in the main kernel with kexec-tools into a specially
  1779. reserved region and then later executed after a crash by
  1780. kdump/kexec. The crash dump kernel must be compiled to a
  1781. memory address not used by the main kernel
  1782. For more details see Documentation/kdump/kdump.txt
  1783. config AUTO_ZRELADDR
  1784. bool "Auto calculation of the decompressed kernel image address"
  1785. depends on !ZBOOT_ROM && !ARCH_U300
  1786. help
  1787. ZRELADDR is the physical address where the decompressed kernel
  1788. image will be placed. If AUTO_ZRELADDR is selected, the address
  1789. will be determined at run-time by masking the current IP with
  1790. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1791. from start of memory.
  1792. endmenu
  1793. menu "CPU Power Management"
  1794. if ARCH_HAS_CPUFREQ
  1795. source "drivers/cpufreq/Kconfig"
  1796. config CPU_FREQ_IMX
  1797. tristate "CPUfreq driver for i.MX CPUs"
  1798. depends on ARCH_MXC && CPU_FREQ
  1799. help
  1800. This enables the CPUfreq driver for i.MX CPUs.
  1801. config CPU_FREQ_SA1100
  1802. bool
  1803. config CPU_FREQ_SA1110
  1804. bool
  1805. config CPU_FREQ_INTEGRATOR
  1806. tristate "CPUfreq driver for ARM Integrator CPUs"
  1807. depends on ARCH_INTEGRATOR && CPU_FREQ
  1808. default y
  1809. help
  1810. This enables the CPUfreq driver for ARM Integrator CPUs.
  1811. For details, take a look at <file:Documentation/cpu-freq>.
  1812. If in doubt, say Y.
  1813. config CPU_FREQ_PXA
  1814. bool
  1815. depends on CPU_FREQ && ARCH_PXA && PXA25x
  1816. default y
  1817. select CPU_FREQ_TABLE
  1818. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  1819. config CPU_FREQ_S3C
  1820. bool
  1821. help
  1822. Internal configuration node for common cpufreq on Samsung SoC
  1823. config CPU_FREQ_S3C24XX
  1824. bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
  1825. depends on ARCH_S3C24XX && CPU_FREQ && EXPERIMENTAL
  1826. select CPU_FREQ_S3C
  1827. help
  1828. This enables the CPUfreq driver for the Samsung S3C24XX family
  1829. of CPUs.
  1830. For details, take a look at <file:Documentation/cpu-freq>.
  1831. If in doubt, say N.
  1832. config CPU_FREQ_S3C24XX_PLL
  1833. bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
  1834. depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
  1835. help
  1836. Compile in support for changing the PLL frequency from the
  1837. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1838. after a frequency change, so by default it is not enabled.
  1839. This also means that the PLL tables for the selected CPU(s) will
  1840. be built which may increase the size of the kernel image.
  1841. config CPU_FREQ_S3C24XX_DEBUG
  1842. bool "Debug CPUfreq Samsung driver core"
  1843. depends on CPU_FREQ_S3C24XX
  1844. help
  1845. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1846. config CPU_FREQ_S3C24XX_IODEBUG
  1847. bool "Debug CPUfreq Samsung driver IO timing"
  1848. depends on CPU_FREQ_S3C24XX
  1849. help
  1850. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1851. config CPU_FREQ_S3C24XX_DEBUGFS
  1852. bool "Export debugfs for CPUFreq"
  1853. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1854. help
  1855. Export status information via debugfs.
  1856. endif
  1857. source "drivers/cpuidle/Kconfig"
  1858. endmenu
  1859. menu "Floating point emulation"
  1860. comment "At least one emulation must be selected"
  1861. config FPE_NWFPE
  1862. bool "NWFPE math emulation"
  1863. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1864. ---help---
  1865. Say Y to include the NWFPE floating point emulator in the kernel.
  1866. This is necessary to run most binaries. Linux does not currently
  1867. support floating point hardware so you need to say Y here even if
  1868. your machine has an FPA or floating point co-processor podule.
  1869. You may say N here if you are going to load the Acorn FPEmulator
  1870. early in the bootup.
  1871. config FPE_NWFPE_XP
  1872. bool "Support extended precision"
  1873. depends on FPE_NWFPE
  1874. help
  1875. Say Y to include 80-bit support in the kernel floating-point
  1876. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1877. Note that gcc does not generate 80-bit operations by default,
  1878. so in most cases this option only enlarges the size of the
  1879. floating point emulator without any good reason.
  1880. You almost surely want to say N here.
  1881. config FPE_FASTFPE
  1882. bool "FastFPE math emulation (EXPERIMENTAL)"
  1883. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  1884. ---help---
  1885. Say Y here to include the FAST floating point emulator in the kernel.
  1886. This is an experimental much faster emulator which now also has full
  1887. precision for the mantissa. It does not support any exceptions.
  1888. It is very simple, and approximately 3-6 times faster than NWFPE.
  1889. It should be sufficient for most programs. It may be not suitable
  1890. for scientific calculations, but you have to check this for yourself.
  1891. If you do not feel you need a faster FP emulation you should better
  1892. choose NWFPE.
  1893. config VFP
  1894. bool "VFP-format floating point maths"
  1895. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1896. help
  1897. Say Y to include VFP support code in the kernel. This is needed
  1898. if your hardware includes a VFP unit.
  1899. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1900. release notes and additional status information.
  1901. Say N if your target does not have VFP hardware.
  1902. config VFPv3
  1903. bool
  1904. depends on VFP
  1905. default y if CPU_V7
  1906. config NEON
  1907. bool "Advanced SIMD (NEON) Extension support"
  1908. depends on VFPv3 && CPU_V7
  1909. help
  1910. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1911. Extension.
  1912. endmenu
  1913. menu "Userspace binary formats"
  1914. source "fs/Kconfig.binfmt"
  1915. config ARTHUR
  1916. tristate "RISC OS personality"
  1917. depends on !AEABI
  1918. help
  1919. Say Y here to include the kernel code necessary if you want to run
  1920. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1921. experimental; if this sounds frightening, say N and sleep in peace.
  1922. You can also say M here to compile this support as a module (which
  1923. will be called arthur).
  1924. endmenu
  1925. menu "Power management options"
  1926. source "kernel/power/Kconfig"
  1927. config ARCH_SUSPEND_POSSIBLE
  1928. depends on !ARCH_S5PC100
  1929. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1930. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
  1931. def_bool y
  1932. config ARM_CPU_SUSPEND
  1933. def_bool PM_SLEEP
  1934. endmenu
  1935. source "net/Kconfig"
  1936. source "drivers/Kconfig"
  1937. source "fs/Kconfig"
  1938. source "arch/arm/Kconfig.debug"
  1939. source "security/Kconfig"
  1940. source "crypto/Kconfig"
  1941. source "lib/Kconfig"