Kconfig 63 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
  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_KGDB
  13. select HAVE_KPROBES if !XIP_KERNEL
  14. select HAVE_KRETPROBES if (HAVE_KPROBES)
  15. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  16. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  17. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  18. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  19. select HAVE_GENERIC_DMA_COHERENT
  20. select HAVE_KERNEL_GZIP
  21. select HAVE_KERNEL_LZO
  22. select HAVE_KERNEL_LZMA
  23. select HAVE_IRQ_WORK
  24. select HAVE_PERF_EVENTS
  25. select PERF_USE_VMALLOC
  26. select HAVE_REGS_AND_STACK_ACCESS_API
  27. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  28. select HAVE_C_RECORDMCOUNT
  29. select HAVE_GENERIC_HARDIRQS
  30. select HAVE_SPARSE_IRQ
  31. select GENERIC_IRQ_SHOW
  32. select CPU_PM if (SUSPEND || CPU_IDLE)
  33. help
  34. The ARM series is a line of low-power-consumption RISC chip designs
  35. licensed by ARM Ltd and targeted at embedded applications and
  36. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  37. manufactured, but legacy ARM-based PC hardware remains popular in
  38. Europe. There is an ARM Linux project with a web page at
  39. <http://www.arm.linux.org.uk/>.
  40. config ARM_HAS_SG_CHAIN
  41. bool
  42. config HAVE_PWM
  43. bool
  44. config MIGHT_HAVE_PCI
  45. bool
  46. config SYS_SUPPORTS_APM_EMULATION
  47. bool
  48. config HAVE_SCHED_CLOCK
  49. bool
  50. config GENERIC_GPIO
  51. bool
  52. config ARCH_USES_GETTIMEOFFSET
  53. bool
  54. default n
  55. config GENERIC_CLOCKEVENTS
  56. bool
  57. config GENERIC_CLOCKEVENTS_BROADCAST
  58. bool
  59. depends on GENERIC_CLOCKEVENTS
  60. default y if SMP
  61. config KTIME_SCALAR
  62. bool
  63. default y
  64. config HAVE_TCM
  65. bool
  66. select GENERIC_ALLOCATOR
  67. config HAVE_PROC_CPU
  68. bool
  69. config NO_IOPORT
  70. bool
  71. config EISA
  72. bool
  73. ---help---
  74. The Extended Industry Standard Architecture (EISA) bus was
  75. developed as an open alternative to the IBM MicroChannel bus.
  76. The EISA bus provided some of the features of the IBM MicroChannel
  77. bus while maintaining backward compatibility with cards made for
  78. the older ISA bus. The EISA bus saw limited use between 1988 and
  79. 1995 when it was made obsolete by the PCI bus.
  80. Say Y here if you are building a kernel for an EISA-based machine.
  81. Otherwise, say N.
  82. config SBUS
  83. bool
  84. config MCA
  85. bool
  86. help
  87. MicroChannel Architecture is found in some IBM PS/2 machines and
  88. laptops. It is a bus system similar to PCI or ISA. See
  89. <file:Documentation/mca.txt> (and especially the web page given
  90. there) before attempting to build an MCA bus kernel.
  91. config STACKTRACE_SUPPORT
  92. bool
  93. default y
  94. config HAVE_LATENCYTOP_SUPPORT
  95. bool
  96. depends on !SMP
  97. default y
  98. config LOCKDEP_SUPPORT
  99. bool
  100. default y
  101. config TRACE_IRQFLAGS_SUPPORT
  102. bool
  103. default y
  104. config HARDIRQS_SW_RESEND
  105. bool
  106. default y
  107. config GENERIC_IRQ_PROBE
  108. bool
  109. default y
  110. config GENERIC_LOCKBREAK
  111. bool
  112. default y
  113. depends on SMP && PREEMPT
  114. config RWSEM_GENERIC_SPINLOCK
  115. bool
  116. default y
  117. config RWSEM_XCHGADD_ALGORITHM
  118. bool
  119. config ARCH_HAS_ILOG2_U32
  120. bool
  121. config ARCH_HAS_ILOG2_U64
  122. bool
  123. config ARCH_HAS_CPUFREQ
  124. bool
  125. help
  126. Internal node to signify that the ARCH has CPUFREQ support
  127. and that the relevant menu configurations are displayed for
  128. it.
  129. config ARCH_HAS_CPU_IDLE_WAIT
  130. def_bool y
  131. config GENERIC_HWEIGHT
  132. bool
  133. default y
  134. config GENERIC_CALIBRATE_DELAY
  135. bool
  136. default y
  137. config ARCH_MAY_HAVE_PC_FDC
  138. bool
  139. config ZONE_DMA
  140. bool
  141. config NEED_DMA_MAP_STATE
  142. def_bool y
  143. config GENERIC_ISA_DMA
  144. bool
  145. config FIQ
  146. bool
  147. config ARCH_MTD_XIP
  148. bool
  149. config VECTORS_BASE
  150. hex
  151. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  152. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  153. default 0x00000000
  154. help
  155. The base address of exception vectors.
  156. config ARM_PATCH_PHYS_VIRT
  157. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  158. default y
  159. depends on !XIP_KERNEL && MMU
  160. depends on !ARCH_REALVIEW || !SPARSEMEM
  161. help
  162. Patch phys-to-virt and virt-to-phys translation functions at
  163. boot and module load time according to the position of the
  164. kernel in system memory.
  165. This can only be used with non-XIP MMU kernels where the base
  166. of physical memory is at a 16MB boundary.
  167. Only disable this option if you know that you do not require
  168. this feature (eg, building a kernel for a single machine) and
  169. you need to shrink the kernel to the minimal size.
  170. config NEED_MACH_MEMORY_H
  171. bool
  172. help
  173. Select this when mach/memory.h is required to provide special
  174. definitions for this platform. The need for mach/memory.h should
  175. be avoided when possible.
  176. config PHYS_OFFSET
  177. hex "Physical address of main memory"
  178. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  179. help
  180. Please provide the physical address corresponding to the
  181. location of main memory in your system.
  182. source "init/Kconfig"
  183. source "kernel/Kconfig.freezer"
  184. menu "System Type"
  185. config MMU
  186. bool "MMU-based Paged Memory Management Support"
  187. default y
  188. help
  189. Select if you want MMU-based virtualised addressing space
  190. support by paged memory management. If unsure, say 'Y'.
  191. #
  192. # The "ARM system type" choice list is ordered alphabetically by option
  193. # text. Please add new entries in the option alphabetic order.
  194. #
  195. choice
  196. prompt "ARM system type"
  197. default ARCH_VERSATILE
  198. config ARCH_INTEGRATOR
  199. bool "ARM Ltd. Integrator family"
  200. select ARM_AMBA
  201. select ARCH_HAS_CPUFREQ
  202. select CLKDEV_LOOKUP
  203. select HAVE_MACH_CLKDEV
  204. select ICST
  205. select GENERIC_CLOCKEVENTS
  206. select PLAT_VERSATILE
  207. select PLAT_VERSATILE_FPGA_IRQ
  208. select NEED_MACH_MEMORY_H
  209. help
  210. Support for ARM's Integrator platform.
  211. config ARCH_REALVIEW
  212. bool "ARM Ltd. RealView family"
  213. select ARM_AMBA
  214. select CLKDEV_LOOKUP
  215. select HAVE_MACH_CLKDEV
  216. select ICST
  217. select GENERIC_CLOCKEVENTS
  218. select ARCH_WANT_OPTIONAL_GPIOLIB
  219. select PLAT_VERSATILE
  220. select PLAT_VERSATILE_CLCD
  221. select ARM_TIMER_SP804
  222. select GPIO_PL061 if GPIOLIB
  223. select NEED_MACH_MEMORY_H
  224. help
  225. This enables support for ARM Ltd RealView boards.
  226. config ARCH_VERSATILE
  227. bool "ARM Ltd. Versatile family"
  228. select ARM_AMBA
  229. select ARM_VIC
  230. select CLKDEV_LOOKUP
  231. select HAVE_MACH_CLKDEV
  232. select ICST
  233. select GENERIC_CLOCKEVENTS
  234. select ARCH_WANT_OPTIONAL_GPIOLIB
  235. select PLAT_VERSATILE
  236. select PLAT_VERSATILE_CLCD
  237. select PLAT_VERSATILE_FPGA_IRQ
  238. select ARM_TIMER_SP804
  239. help
  240. This enables support for ARM Ltd Versatile board.
  241. config ARCH_VEXPRESS
  242. bool "ARM Ltd. Versatile Express family"
  243. select ARCH_WANT_OPTIONAL_GPIOLIB
  244. select ARM_AMBA
  245. select ARM_TIMER_SP804
  246. select CLKDEV_LOOKUP
  247. select HAVE_MACH_CLKDEV
  248. select GENERIC_CLOCKEVENTS
  249. select HAVE_CLK
  250. select HAVE_PATA_PLATFORM
  251. select ICST
  252. select PLAT_VERSATILE
  253. select PLAT_VERSATILE_CLCD
  254. help
  255. This enables support for the ARM Ltd Versatile Express boards.
  256. config ARCH_AT91
  257. bool "Atmel AT91"
  258. select ARCH_REQUIRE_GPIOLIB
  259. select HAVE_CLK
  260. select CLKDEV_LOOKUP
  261. help
  262. This enables support for systems based on the Atmel AT91RM9200,
  263. AT91SAM9 and AT91CAP9 processors.
  264. config ARCH_BCMRING
  265. bool "Broadcom BCMRING"
  266. depends on MMU
  267. select CPU_V6
  268. select ARM_AMBA
  269. select ARM_TIMER_SP804
  270. select CLKDEV_LOOKUP
  271. select GENERIC_CLOCKEVENTS
  272. select ARCH_WANT_OPTIONAL_GPIOLIB
  273. help
  274. Support for Broadcom's BCMRing platform.
  275. config ARCH_HIGHBANK
  276. bool "Calxeda Highbank-based"
  277. select ARCH_WANT_OPTIONAL_GPIOLIB
  278. select ARM_AMBA
  279. select ARM_GIC
  280. select ARM_TIMER_SP804
  281. select CLKDEV_LOOKUP
  282. select CPU_V7
  283. select GENERIC_CLOCKEVENTS
  284. select HAVE_ARM_SCU
  285. select USE_OF
  286. help
  287. Support for the Calxeda Highbank SoC based boards.
  288. config ARCH_CLPS711X
  289. bool "Cirrus Logic CLPS711x/EP721x-based"
  290. select CPU_ARM720T
  291. select ARCH_USES_GETTIMEOFFSET
  292. select NEED_MACH_MEMORY_H
  293. help
  294. Support for Cirrus Logic 711x/721x based boards.
  295. config ARCH_CNS3XXX
  296. bool "Cavium Networks CNS3XXX family"
  297. select CPU_V6K
  298. select GENERIC_CLOCKEVENTS
  299. select ARM_GIC
  300. select MIGHT_HAVE_PCI
  301. select PCI_DOMAINS if PCI
  302. help
  303. Support for Cavium Networks CNS3XXX platform.
  304. config ARCH_GEMINI
  305. bool "Cortina Systems Gemini"
  306. select CPU_FA526
  307. select ARCH_REQUIRE_GPIOLIB
  308. select ARCH_USES_GETTIMEOFFSET
  309. help
  310. Support for the Cortina Systems Gemini family SoCs
  311. config ARCH_PRIMA2
  312. bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
  313. select CPU_V7
  314. select GENERIC_TIME
  315. select NO_IOPORT
  316. select GENERIC_CLOCKEVENTS
  317. select CLKDEV_LOOKUP
  318. select GENERIC_IRQ_CHIP
  319. select USE_OF
  320. select ZONE_DMA
  321. help
  322. Support for CSR SiRFSoC ARM Cortex A9 Platform
  323. config ARCH_EBSA110
  324. bool "EBSA-110"
  325. select CPU_SA110
  326. select ISA
  327. select NO_IOPORT
  328. select ARCH_USES_GETTIMEOFFSET
  329. select NEED_MACH_MEMORY_H
  330. help
  331. This is an evaluation board for the StrongARM processor available
  332. from Digital. It has limited hardware on-board, including an
  333. Ethernet interface, two PCMCIA sockets, two serial ports and a
  334. parallel port.
  335. config ARCH_EP93XX
  336. bool "EP93xx-based"
  337. select CPU_ARM920T
  338. select ARM_AMBA
  339. select ARM_VIC
  340. select CLKDEV_LOOKUP
  341. select ARCH_REQUIRE_GPIOLIB
  342. select ARCH_HAS_HOLES_MEMORYMODEL
  343. select ARCH_USES_GETTIMEOFFSET
  344. select NEED_MEMORY_H
  345. help
  346. This enables support for the Cirrus EP93xx series of CPUs.
  347. config ARCH_FOOTBRIDGE
  348. bool "FootBridge"
  349. select CPU_SA110
  350. select FOOTBRIDGE
  351. select GENERIC_CLOCKEVENTS
  352. select NEED_MACH_MEMORY_H
  353. help
  354. Support for systems based on the DC21285 companion chip
  355. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  356. config ARCH_MXC
  357. bool "Freescale MXC/iMX-based"
  358. select GENERIC_CLOCKEVENTS
  359. select ARCH_REQUIRE_GPIOLIB
  360. select CLKDEV_LOOKUP
  361. select CLKSRC_MMIO
  362. select GENERIC_IRQ_CHIP
  363. select HAVE_SCHED_CLOCK
  364. help
  365. Support for Freescale MXC/iMX-based family of processors
  366. config ARCH_MXS
  367. bool "Freescale MXS-based"
  368. select GENERIC_CLOCKEVENTS
  369. select ARCH_REQUIRE_GPIOLIB
  370. select CLKDEV_LOOKUP
  371. select CLKSRC_MMIO
  372. help
  373. Support for Freescale MXS-based family of processors
  374. config ARCH_NETX
  375. bool "Hilscher NetX based"
  376. select CLKSRC_MMIO
  377. select CPU_ARM926T
  378. select ARM_VIC
  379. select GENERIC_CLOCKEVENTS
  380. help
  381. This enables support for systems based on the Hilscher NetX Soc
  382. config ARCH_H720X
  383. bool "Hynix HMS720x-based"
  384. select CPU_ARM720T
  385. select ISA_DMA_API
  386. select ARCH_USES_GETTIMEOFFSET
  387. help
  388. This enables support for systems based on the Hynix HMS720x
  389. config ARCH_IOP13XX
  390. bool "IOP13xx-based"
  391. depends on MMU
  392. select CPU_XSC3
  393. select PLAT_IOP
  394. select PCI
  395. select ARCH_SUPPORTS_MSI
  396. select VMSPLIT_1G
  397. select NEED_MACH_MEMORY_H
  398. help
  399. Support for Intel's IOP13XX (XScale) family of processors.
  400. config ARCH_IOP32X
  401. bool "IOP32x-based"
  402. depends on MMU
  403. select CPU_XSCALE
  404. select PLAT_IOP
  405. select PCI
  406. select ARCH_REQUIRE_GPIOLIB
  407. help
  408. Support for Intel's 80219 and IOP32X (XScale) family of
  409. processors.
  410. config ARCH_IOP33X
  411. bool "IOP33x-based"
  412. depends on MMU
  413. select CPU_XSCALE
  414. select PLAT_IOP
  415. select PCI
  416. select ARCH_REQUIRE_GPIOLIB
  417. help
  418. Support for Intel's IOP33X (XScale) family of processors.
  419. config ARCH_IXP23XX
  420. bool "IXP23XX-based"
  421. depends on MMU
  422. select CPU_XSC3
  423. select PCI
  424. select ARCH_USES_GETTIMEOFFSET
  425. select NEED_MACH_MEMORY_H
  426. help
  427. Support for Intel's IXP23xx (XScale) family of processors.
  428. config ARCH_IXP2000
  429. bool "IXP2400/2800-based"
  430. depends on MMU
  431. select CPU_XSCALE
  432. select PCI
  433. select ARCH_USES_GETTIMEOFFSET
  434. select NEED_MACH_MEMORY_H
  435. help
  436. Support for Intel's IXP2400/2800 (XScale) family of processors.
  437. config ARCH_IXP4XX
  438. bool "IXP4xx-based"
  439. depends on MMU
  440. select CLKSRC_MMIO
  441. select CPU_XSCALE
  442. select GENERIC_GPIO
  443. select GENERIC_CLOCKEVENTS
  444. select HAVE_SCHED_CLOCK
  445. select MIGHT_HAVE_PCI
  446. select DMABOUNCE if PCI
  447. help
  448. Support for Intel's IXP4XX (XScale) family of processors.
  449. config ARCH_DOVE
  450. bool "Marvell Dove"
  451. select CPU_V7
  452. select PCI
  453. select ARCH_REQUIRE_GPIOLIB
  454. select GENERIC_CLOCKEVENTS
  455. select PLAT_ORION
  456. help
  457. Support for the Marvell Dove SoC 88AP510
  458. config ARCH_KIRKWOOD
  459. bool "Marvell Kirkwood"
  460. select CPU_FEROCEON
  461. select PCI
  462. select ARCH_REQUIRE_GPIOLIB
  463. select GENERIC_CLOCKEVENTS
  464. select PLAT_ORION
  465. help
  466. Support for the following Marvell Kirkwood series SoCs:
  467. 88F6180, 88F6192 and 88F6281.
  468. config ARCH_LPC32XX
  469. bool "NXP LPC32XX"
  470. select CLKSRC_MMIO
  471. select CPU_ARM926T
  472. select ARCH_REQUIRE_GPIOLIB
  473. select HAVE_IDE
  474. select ARM_AMBA
  475. select USB_ARCH_HAS_OHCI
  476. select CLKDEV_LOOKUP
  477. select GENERIC_TIME
  478. select GENERIC_CLOCKEVENTS
  479. help
  480. Support for the NXP LPC32XX family of processors
  481. config ARCH_MV78XX0
  482. bool "Marvell MV78xx0"
  483. select CPU_FEROCEON
  484. select PCI
  485. select ARCH_REQUIRE_GPIOLIB
  486. select GENERIC_CLOCKEVENTS
  487. select PLAT_ORION
  488. help
  489. Support for the following Marvell MV78xx0 series SoCs:
  490. MV781x0, MV782x0.
  491. config ARCH_ORION5X
  492. bool "Marvell Orion"
  493. depends on MMU
  494. select CPU_FEROCEON
  495. select PCI
  496. select ARCH_REQUIRE_GPIOLIB
  497. select GENERIC_CLOCKEVENTS
  498. select PLAT_ORION
  499. help
  500. Support for the following Marvell Orion 5x series SoCs:
  501. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  502. Orion-2 (5281), Orion-1-90 (6183).
  503. config ARCH_MMP
  504. bool "Marvell PXA168/910/MMP2"
  505. depends on MMU
  506. select ARCH_REQUIRE_GPIOLIB
  507. select CLKDEV_LOOKUP
  508. select GENERIC_CLOCKEVENTS
  509. select HAVE_SCHED_CLOCK
  510. select TICK_ONESHOT
  511. select PLAT_PXA
  512. select SPARSE_IRQ
  513. help
  514. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  515. config ARCH_KS8695
  516. bool "Micrel/Kendin KS8695"
  517. select CPU_ARM922T
  518. select ARCH_REQUIRE_GPIOLIB
  519. select ARCH_USES_GETTIMEOFFSET
  520. select NEED_MACH_MEMORY_H
  521. help
  522. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  523. System-on-Chip devices.
  524. config ARCH_W90X900
  525. bool "Nuvoton W90X900 CPU"
  526. select CPU_ARM926T
  527. select ARCH_REQUIRE_GPIOLIB
  528. select CLKDEV_LOOKUP
  529. select CLKSRC_MMIO
  530. select GENERIC_CLOCKEVENTS
  531. help
  532. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  533. At present, the w90x900 has been renamed nuc900, regarding
  534. the ARM series product line, you can login the following
  535. link address to know more.
  536. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  537. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  538. config ARCH_NUC93X
  539. bool "Nuvoton NUC93X CPU"
  540. select CPU_ARM926T
  541. select CLKDEV_LOOKUP
  542. help
  543. Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
  544. low-power and high performance MPEG-4/JPEG multimedia controller chip.
  545. config ARCH_TEGRA
  546. bool "NVIDIA Tegra"
  547. select CLKDEV_LOOKUP
  548. select CLKSRC_MMIO
  549. select GENERIC_TIME
  550. select GENERIC_CLOCKEVENTS
  551. select GENERIC_GPIO
  552. select HAVE_CLK
  553. select HAVE_SCHED_CLOCK
  554. select ARCH_HAS_CPUFREQ
  555. help
  556. This enables support for NVIDIA Tegra based systems (Tegra APX,
  557. Tegra 6xx and Tegra 2 series).
  558. config ARCH_PNX4008
  559. bool "Philips Nexperia PNX4008 Mobile"
  560. select CPU_ARM926T
  561. select CLKDEV_LOOKUP
  562. select ARCH_USES_GETTIMEOFFSET
  563. help
  564. This enables support for Philips PNX4008 mobile platform.
  565. config ARCH_PXA
  566. bool "PXA2xx/PXA3xx-based"
  567. depends on MMU
  568. select ARCH_MTD_XIP
  569. select ARCH_HAS_CPUFREQ
  570. select CLKDEV_LOOKUP
  571. select CLKSRC_MMIO
  572. select ARCH_REQUIRE_GPIOLIB
  573. select GENERIC_CLOCKEVENTS
  574. select HAVE_SCHED_CLOCK
  575. select TICK_ONESHOT
  576. select PLAT_PXA
  577. select SPARSE_IRQ
  578. select AUTO_ZRELADDR
  579. select MULTI_IRQ_HANDLER
  580. help
  581. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  582. config ARCH_MSM
  583. bool "Qualcomm MSM"
  584. select HAVE_CLK
  585. select GENERIC_CLOCKEVENTS
  586. select ARCH_REQUIRE_GPIOLIB
  587. select CLKDEV_LOOKUP
  588. help
  589. Support for Qualcomm MSM/QSD based systems. This runs on the
  590. apps processor of the MSM/QSD and depends on a shared memory
  591. interface to the modem processor which runs the baseband
  592. stack and controls some vital subsystems
  593. (clock and power control, etc).
  594. config ARCH_SHMOBILE
  595. bool "Renesas SH-Mobile / R-Mobile"
  596. select HAVE_CLK
  597. select CLKDEV_LOOKUP
  598. select HAVE_MACH_CLKDEV
  599. select GENERIC_CLOCKEVENTS
  600. select NO_IOPORT
  601. select SPARSE_IRQ
  602. select MULTI_IRQ_HANDLER
  603. select PM_GENERIC_DOMAINS if PM
  604. select NEED_MACH_MEMORY_H
  605. help
  606. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  607. config ARCH_RPC
  608. bool "RiscPC"
  609. select ARCH_ACORN
  610. select FIQ
  611. select TIMER_ACORN
  612. select ARCH_MAY_HAVE_PC_FDC
  613. select HAVE_PATA_PLATFORM
  614. select ISA_DMA_API
  615. select NO_IOPORT
  616. select ARCH_SPARSEMEM_ENABLE
  617. select ARCH_USES_GETTIMEOFFSET
  618. select NEED_MACH_MEMORY_H
  619. help
  620. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  621. CD-ROM interface, serial and parallel port, and the floppy drive.
  622. config ARCH_SA1100
  623. bool "SA1100-based"
  624. select CLKSRC_MMIO
  625. select CPU_SA1100
  626. select ISA
  627. select ARCH_SPARSEMEM_ENABLE
  628. select ARCH_MTD_XIP
  629. select ARCH_HAS_CPUFREQ
  630. select CPU_FREQ
  631. select GENERIC_CLOCKEVENTS
  632. select HAVE_CLK
  633. select HAVE_SCHED_CLOCK
  634. select TICK_ONESHOT
  635. select ARCH_REQUIRE_GPIOLIB
  636. select NEED_MACH_MEMORY_H
  637. help
  638. Support for StrongARM 11x0 based boards.
  639. config ARCH_S3C2410
  640. bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
  641. select GENERIC_GPIO
  642. select ARCH_HAS_CPUFREQ
  643. select HAVE_CLK
  644. select CLKDEV_LOOKUP
  645. select ARCH_USES_GETTIMEOFFSET
  646. select HAVE_S3C2410_I2C if I2C
  647. help
  648. Samsung S3C2410X CPU based systems, such as the Simtec Electronics
  649. BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
  650. the Samsung SMDK2410 development board (and derivatives).
  651. Note, the S3C2416 and the S3C2450 are so close that they even share
  652. the same SoC ID code. This means that there is no separate machine
  653. directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
  654. config ARCH_S3C64XX
  655. bool "Samsung S3C64XX"
  656. select PLAT_SAMSUNG
  657. select CPU_V6
  658. select ARM_VIC
  659. select HAVE_CLK
  660. select CLKDEV_LOOKUP
  661. select NO_IOPORT
  662. select ARCH_USES_GETTIMEOFFSET
  663. select ARCH_HAS_CPUFREQ
  664. select ARCH_REQUIRE_GPIOLIB
  665. select SAMSUNG_CLKSRC
  666. select SAMSUNG_IRQ_VIC_TIMER
  667. select SAMSUNG_IRQ_UART
  668. select S3C_GPIO_TRACK
  669. select S3C_GPIO_PULL_UPDOWN
  670. select S3C_GPIO_CFG_S3C24XX
  671. select S3C_GPIO_CFG_S3C64XX
  672. select S3C_DEV_NAND
  673. select USB_ARCH_HAS_OHCI
  674. select SAMSUNG_GPIOLIB_4BIT
  675. select HAVE_S3C2410_I2C if I2C
  676. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  677. help
  678. Samsung S3C64XX series based systems
  679. config ARCH_S5P64X0
  680. bool "Samsung S5P6440 S5P6450"
  681. select CPU_V6
  682. select GENERIC_GPIO
  683. select HAVE_CLK
  684. select CLKDEV_LOOKUP
  685. select CLKSRC_MMIO
  686. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  687. select GENERIC_CLOCKEVENTS
  688. select HAVE_SCHED_CLOCK
  689. select HAVE_S3C2410_I2C if I2C
  690. select HAVE_S3C_RTC if RTC_CLASS
  691. help
  692. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  693. SMDK6450.
  694. config ARCH_S5PC100
  695. bool "Samsung S5PC100"
  696. select GENERIC_GPIO
  697. select HAVE_CLK
  698. select CLKDEV_LOOKUP
  699. select CPU_V7
  700. select ARM_L1_CACHE_SHIFT_6
  701. select ARCH_USES_GETTIMEOFFSET
  702. select HAVE_S3C2410_I2C if I2C
  703. select HAVE_S3C_RTC if RTC_CLASS
  704. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  705. help
  706. Samsung S5PC100 series based systems
  707. config ARCH_S5PV210
  708. bool "Samsung S5PV210/S5PC110"
  709. select CPU_V7
  710. select ARCH_SPARSEMEM_ENABLE
  711. select ARCH_HAS_HOLES_MEMORYMODEL
  712. select GENERIC_GPIO
  713. select HAVE_CLK
  714. select CLKDEV_LOOKUP
  715. select CLKSRC_MMIO
  716. select ARM_L1_CACHE_SHIFT_6
  717. select ARCH_HAS_CPUFREQ
  718. select GENERIC_CLOCKEVENTS
  719. select HAVE_SCHED_CLOCK
  720. select HAVE_S3C2410_I2C if I2C
  721. select HAVE_S3C_RTC if RTC_CLASS
  722. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  723. select NEED_MACH_MEMORY_H
  724. help
  725. Samsung S5PV210/S5PC110 series based systems
  726. config ARCH_EXYNOS4
  727. bool "Samsung EXYNOS4"
  728. select CPU_V7
  729. select ARCH_SPARSEMEM_ENABLE
  730. select ARCH_HAS_HOLES_MEMORYMODEL
  731. select GENERIC_GPIO
  732. select HAVE_CLK
  733. select CLKDEV_LOOKUP
  734. select ARCH_HAS_CPUFREQ
  735. select GENERIC_CLOCKEVENTS
  736. select HAVE_S3C_RTC if RTC_CLASS
  737. select HAVE_S3C2410_I2C if I2C
  738. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  739. select NEED_MACH_MEMORY_H
  740. help
  741. Samsung EXYNOS4 series based systems
  742. config ARCH_SHARK
  743. bool "Shark"
  744. select CPU_SA110
  745. select ISA
  746. select ISA_DMA
  747. select ZONE_DMA
  748. select PCI
  749. select ARCH_USES_GETTIMEOFFSET
  750. select NEED_MACH_MEMORY_H
  751. help
  752. Support for the StrongARM based Digital DNARD machine, also known
  753. as "Shark" (<http://www.shark-linux.de/shark.html>).
  754. config ARCH_TCC_926
  755. bool "Telechips TCC ARM926-based systems"
  756. select CLKSRC_MMIO
  757. select CPU_ARM926T
  758. select HAVE_CLK
  759. select CLKDEV_LOOKUP
  760. select GENERIC_CLOCKEVENTS
  761. help
  762. Support for Telechips TCC ARM926-based systems.
  763. config ARCH_U300
  764. bool "ST-Ericsson U300 Series"
  765. depends on MMU
  766. select CLKSRC_MMIO
  767. select CPU_ARM926T
  768. select HAVE_SCHED_CLOCK
  769. select HAVE_TCM
  770. select ARM_AMBA
  771. select ARM_VIC
  772. select GENERIC_CLOCKEVENTS
  773. select CLKDEV_LOOKUP
  774. select HAVE_MACH_CLKDEV
  775. select GENERIC_GPIO
  776. select ARCH_REQUIRE_GPIOLIB
  777. select NEED_MACH_MEMORY_H
  778. help
  779. Support for ST-Ericsson U300 series mobile platforms.
  780. config ARCH_U8500
  781. bool "ST-Ericsson U8500 Series"
  782. select CPU_V7
  783. select ARM_AMBA
  784. select GENERIC_CLOCKEVENTS
  785. select CLKDEV_LOOKUP
  786. select ARCH_REQUIRE_GPIOLIB
  787. select ARCH_HAS_CPUFREQ
  788. help
  789. Support for ST-Ericsson's Ux500 architecture
  790. config ARCH_NOMADIK
  791. bool "STMicroelectronics Nomadik"
  792. select ARM_AMBA
  793. select ARM_VIC
  794. select CPU_ARM926T
  795. select CLKDEV_LOOKUP
  796. select GENERIC_CLOCKEVENTS
  797. select ARCH_REQUIRE_GPIOLIB
  798. help
  799. Support for the Nomadik platform by ST-Ericsson
  800. config ARCH_DAVINCI
  801. bool "TI DaVinci"
  802. select GENERIC_CLOCKEVENTS
  803. select ARCH_REQUIRE_GPIOLIB
  804. select ZONE_DMA
  805. select HAVE_IDE
  806. select CLKDEV_LOOKUP
  807. select GENERIC_ALLOCATOR
  808. select GENERIC_IRQ_CHIP
  809. select ARCH_HAS_HOLES_MEMORYMODEL
  810. help
  811. Support for TI's DaVinci platform.
  812. config ARCH_OMAP
  813. bool "TI OMAP"
  814. select HAVE_CLK
  815. select ARCH_REQUIRE_GPIOLIB
  816. select ARCH_HAS_CPUFREQ
  817. select CLKSRC_MMIO
  818. select GENERIC_CLOCKEVENTS
  819. select HAVE_SCHED_CLOCK
  820. select ARCH_HAS_HOLES_MEMORYMODEL
  821. help
  822. Support for TI's OMAP platform (OMAP1/2/3/4).
  823. config PLAT_SPEAR
  824. bool "ST SPEAr"
  825. select ARM_AMBA
  826. select ARCH_REQUIRE_GPIOLIB
  827. select CLKDEV_LOOKUP
  828. select CLKSRC_MMIO
  829. select GENERIC_CLOCKEVENTS
  830. select HAVE_CLK
  831. help
  832. Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
  833. config ARCH_VT8500
  834. bool "VIA/WonderMedia 85xx"
  835. select CPU_ARM926T
  836. select GENERIC_GPIO
  837. select ARCH_HAS_CPUFREQ
  838. select GENERIC_CLOCKEVENTS
  839. select ARCH_REQUIRE_GPIOLIB
  840. select HAVE_PWM
  841. help
  842. Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
  843. config ARCH_ZYNQ
  844. bool "Xilinx Zynq ARM Cortex A9 Platform"
  845. select CPU_V7
  846. select GENERIC_TIME
  847. select GENERIC_CLOCKEVENTS
  848. select CLKDEV_LOOKUP
  849. select ARM_GIC
  850. select ARM_AMBA
  851. select ICST
  852. select USE_OF
  853. help
  854. Support for Xilinx Zynq ARM Cortex A9 Platform
  855. endchoice
  856. #
  857. # This is sorted alphabetically by mach-* pathname. However, plat-*
  858. # Kconfigs may be included either alphabetically (according to the
  859. # plat- suffix) or along side the corresponding mach-* source.
  860. #
  861. source "arch/arm/mach-at91/Kconfig"
  862. source "arch/arm/mach-bcmring/Kconfig"
  863. source "arch/arm/mach-clps711x/Kconfig"
  864. source "arch/arm/mach-cns3xxx/Kconfig"
  865. source "arch/arm/mach-davinci/Kconfig"
  866. source "arch/arm/mach-dove/Kconfig"
  867. source "arch/arm/mach-ep93xx/Kconfig"
  868. source "arch/arm/mach-footbridge/Kconfig"
  869. source "arch/arm/mach-gemini/Kconfig"
  870. source "arch/arm/mach-h720x/Kconfig"
  871. source "arch/arm/mach-integrator/Kconfig"
  872. source "arch/arm/mach-iop32x/Kconfig"
  873. source "arch/arm/mach-iop33x/Kconfig"
  874. source "arch/arm/mach-iop13xx/Kconfig"
  875. source "arch/arm/mach-ixp4xx/Kconfig"
  876. source "arch/arm/mach-ixp2000/Kconfig"
  877. source "arch/arm/mach-ixp23xx/Kconfig"
  878. source "arch/arm/mach-kirkwood/Kconfig"
  879. source "arch/arm/mach-ks8695/Kconfig"
  880. source "arch/arm/mach-lpc32xx/Kconfig"
  881. source "arch/arm/mach-msm/Kconfig"
  882. source "arch/arm/mach-mv78xx0/Kconfig"
  883. source "arch/arm/plat-mxc/Kconfig"
  884. source "arch/arm/mach-mxs/Kconfig"
  885. source "arch/arm/mach-netx/Kconfig"
  886. source "arch/arm/mach-nomadik/Kconfig"
  887. source "arch/arm/plat-nomadik/Kconfig"
  888. source "arch/arm/mach-nuc93x/Kconfig"
  889. source "arch/arm/plat-omap/Kconfig"
  890. source "arch/arm/mach-omap1/Kconfig"
  891. source "arch/arm/mach-omap2/Kconfig"
  892. source "arch/arm/mach-orion5x/Kconfig"
  893. source "arch/arm/mach-pxa/Kconfig"
  894. source "arch/arm/plat-pxa/Kconfig"
  895. source "arch/arm/mach-mmp/Kconfig"
  896. source "arch/arm/mach-realview/Kconfig"
  897. source "arch/arm/mach-sa1100/Kconfig"
  898. source "arch/arm/plat-samsung/Kconfig"
  899. source "arch/arm/plat-s3c24xx/Kconfig"
  900. source "arch/arm/plat-s5p/Kconfig"
  901. source "arch/arm/plat-spear/Kconfig"
  902. source "arch/arm/plat-tcc/Kconfig"
  903. if ARCH_S3C2410
  904. source "arch/arm/mach-s3c2410/Kconfig"
  905. source "arch/arm/mach-s3c2412/Kconfig"
  906. source "arch/arm/mach-s3c2416/Kconfig"
  907. source "arch/arm/mach-s3c2440/Kconfig"
  908. source "arch/arm/mach-s3c2443/Kconfig"
  909. endif
  910. if ARCH_S3C64XX
  911. source "arch/arm/mach-s3c64xx/Kconfig"
  912. endif
  913. source "arch/arm/mach-s5p64x0/Kconfig"
  914. source "arch/arm/mach-s5pc100/Kconfig"
  915. source "arch/arm/mach-s5pv210/Kconfig"
  916. source "arch/arm/mach-exynos4/Kconfig"
  917. source "arch/arm/mach-shmobile/Kconfig"
  918. source "arch/arm/mach-tegra/Kconfig"
  919. source "arch/arm/mach-u300/Kconfig"
  920. source "arch/arm/mach-ux500/Kconfig"
  921. source "arch/arm/mach-versatile/Kconfig"
  922. source "arch/arm/mach-vexpress/Kconfig"
  923. source "arch/arm/plat-versatile/Kconfig"
  924. source "arch/arm/mach-vt8500/Kconfig"
  925. source "arch/arm/mach-w90x900/Kconfig"
  926. # Definitions to make life easier
  927. config ARCH_ACORN
  928. bool
  929. config PLAT_IOP
  930. bool
  931. select GENERIC_CLOCKEVENTS
  932. select HAVE_SCHED_CLOCK
  933. config PLAT_ORION
  934. bool
  935. select CLKSRC_MMIO
  936. select GENERIC_IRQ_CHIP
  937. select HAVE_SCHED_CLOCK
  938. config PLAT_PXA
  939. bool
  940. config PLAT_VERSATILE
  941. bool
  942. config ARM_TIMER_SP804
  943. bool
  944. select CLKSRC_MMIO
  945. source arch/arm/mm/Kconfig
  946. config IWMMXT
  947. bool "Enable iWMMXt support"
  948. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  949. default y if PXA27x || PXA3xx || PXA95x || ARCH_MMP
  950. help
  951. Enable support for iWMMXt context switching at run time if
  952. running on a CPU that supports it.
  953. # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
  954. config XSCALE_PMU
  955. bool
  956. depends on CPU_XSCALE && !XSCALE_PMU_TIMER
  957. default y
  958. config CPU_HAS_PMU
  959. depends on (CPU_V6 || CPU_V6K || CPU_V7 || XSCALE_PMU) && \
  960. (!ARCH_OMAP3 || OMAP3_EMU)
  961. default y
  962. bool
  963. config MULTI_IRQ_HANDLER
  964. bool
  965. help
  966. Allow each machine to specify it's own IRQ handler at run time.
  967. if !MMU
  968. source "arch/arm/Kconfig-nommu"
  969. endif
  970. config ARM_ERRATA_411920
  971. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  972. depends on CPU_V6 || CPU_V6K
  973. help
  974. Invalidation of the Instruction Cache operation can
  975. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  976. It does not affect the MPCore. This option enables the ARM Ltd.
  977. recommended workaround.
  978. config ARM_ERRATA_430973
  979. bool "ARM errata: Stale prediction on replaced interworking branch"
  980. depends on CPU_V7
  981. help
  982. This option enables the workaround for the 430973 Cortex-A8
  983. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  984. interworking branch is replaced with another code sequence at the
  985. same virtual address, whether due to self-modifying code or virtual
  986. to physical address re-mapping, Cortex-A8 does not recover from the
  987. stale interworking branch prediction. This results in Cortex-A8
  988. executing the new code sequence in the incorrect ARM or Thumb state.
  989. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  990. and also flushes the branch target cache at every context switch.
  991. Note that setting specific bits in the ACTLR register may not be
  992. available in non-secure mode.
  993. config ARM_ERRATA_458693
  994. bool "ARM errata: Processor deadlock when a false hazard is created"
  995. depends on CPU_V7
  996. help
  997. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  998. erratum. For very specific sequences of memory operations, it is
  999. possible for a hazard condition intended for a cache line to instead
  1000. be incorrectly associated with a different cache line. This false
  1001. hazard might then cause a processor deadlock. The workaround enables
  1002. the L1 caching of the NEON accesses and disables the PLD instruction
  1003. in the ACTLR register. Note that setting specific bits in the ACTLR
  1004. register may not be available in non-secure mode.
  1005. config ARM_ERRATA_460075
  1006. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  1007. depends on CPU_V7
  1008. help
  1009. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  1010. erratum. Any asynchronous access to the L2 cache may encounter a
  1011. situation in which recent store transactions to the L2 cache are lost
  1012. and overwritten with stale memory contents from external memory. The
  1013. workaround disables the write-allocate mode for the L2 cache via the
  1014. ACTLR register. Note that setting specific bits in the ACTLR register
  1015. may not be available in non-secure mode.
  1016. config ARM_ERRATA_742230
  1017. bool "ARM errata: DMB operation may be faulty"
  1018. depends on CPU_V7 && SMP
  1019. help
  1020. This option enables the workaround for the 742230 Cortex-A9
  1021. (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
  1022. between two write operations may not ensure the correct visibility
  1023. ordering of the two writes. This workaround sets a specific bit in
  1024. the diagnostic register of the Cortex-A9 which causes the DMB
  1025. instruction to behave as a DSB, ensuring the correct behaviour of
  1026. the two writes.
  1027. config ARM_ERRATA_742231
  1028. bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
  1029. depends on CPU_V7 && SMP
  1030. help
  1031. This option enables the workaround for the 742231 Cortex-A9
  1032. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  1033. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  1034. accessing some data located in the same cache line, may get corrupted
  1035. data due to bad handling of the address hazard when the line gets
  1036. replaced from one of the CPUs at the same time as another CPU is
  1037. accessing it. This workaround sets specific bits in the diagnostic
  1038. register of the Cortex-A9 which reduces the linefill issuing
  1039. capabilities of the processor.
  1040. config PL310_ERRATA_588369
  1041. bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
  1042. depends on CACHE_L2X0
  1043. help
  1044. The PL310 L2 cache controller implements three types of Clean &
  1045. Invalidate maintenance operations: by Physical Address
  1046. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1047. They are architecturally defined to behave as the execution of a
  1048. clean operation followed immediately by an invalidate operation,
  1049. both performing to the same memory location. This functionality
  1050. is not correctly implemented in PL310 as clean lines are not
  1051. invalidated as a result of these operations.
  1052. config ARM_ERRATA_720789
  1053. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1054. depends on CPU_V7 && SMP
  1055. help
  1056. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1057. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1058. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1059. As a consequence of this erratum, some TLB entries which should be
  1060. invalidated are not, resulting in an incoherency in the system page
  1061. tables. The workaround changes the TLB flushing routines to invalidate
  1062. entries regardless of the ASID.
  1063. config PL310_ERRATA_727915
  1064. bool "Background Clean & Invalidate by Way operation can cause data corruption"
  1065. depends on CACHE_L2X0
  1066. help
  1067. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1068. operation (offset 0x7FC). This operation runs in background so that
  1069. PL310 can handle normal accesses while it is in progress. Under very
  1070. rare circumstances, due to this erratum, write data can be lost when
  1071. PL310 treats a cacheable write transaction during a Clean &
  1072. Invalidate by Way operation.
  1073. config ARM_ERRATA_743622
  1074. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1075. depends on CPU_V7
  1076. help
  1077. This option enables the workaround for the 743622 Cortex-A9
  1078. (r2p0..r2p2) erratum. Under very rare conditions, a faulty
  1079. optimisation in the Cortex-A9 Store Buffer may lead to data
  1080. corruption. This workaround sets a specific bit in the diagnostic
  1081. register of the Cortex-A9 which disables the Store Buffer
  1082. optimisation, preventing the defect from occurring. This has no
  1083. visible impact on the overall performance or power consumption of the
  1084. processor.
  1085. config ARM_ERRATA_751472
  1086. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1087. depends on CPU_V7 && SMP
  1088. help
  1089. This option enables the workaround for the 751472 Cortex-A9 (prior
  1090. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1091. completion of a following broadcasted operation if the second
  1092. operation is received by a CPU before the ICIALLUIS has completed,
  1093. potentially leading to corrupted entries in the cache or TLB.
  1094. config ARM_ERRATA_753970
  1095. bool "ARM errata: cache sync operation may be faulty"
  1096. depends on CACHE_PL310
  1097. help
  1098. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1099. Under some condition the effect of cache sync operation on
  1100. the store buffer still remains when the operation completes.
  1101. This means that the store buffer is always asked to drain and
  1102. this prevents it from merging any further writes. The workaround
  1103. is to replace the normal offset of cache sync operation (0x730)
  1104. by another offset targeting an unmapped PL310 register 0x740.
  1105. This has the same effect as the cache sync operation: store buffer
  1106. drain and waiting for all buffers empty.
  1107. config ARM_ERRATA_754322
  1108. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1109. depends on CPU_V7
  1110. help
  1111. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1112. r3p*) erratum. A speculative memory access may cause a page table walk
  1113. which starts prior to an ASID switch but completes afterwards. This
  1114. can populate the micro-TLB with a stale entry which may be hit with
  1115. the new ASID. This workaround places two dsb instructions in the mm
  1116. switching code so that no page table walks can cross the ASID switch.
  1117. config ARM_ERRATA_754327
  1118. bool "ARM errata: no automatic Store Buffer drain"
  1119. depends on CPU_V7 && SMP
  1120. help
  1121. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1122. r2p0) erratum. The Store Buffer does not have any automatic draining
  1123. mechanism and therefore a livelock may occur if an external agent
  1124. continuously polls a memory location waiting to observe an update.
  1125. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1126. written polling loops from denying visibility of updates to memory.
  1127. config ARM_ERRATA_364296
  1128. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1129. depends on CPU_V6 && !SMP
  1130. help
  1131. This options enables the workaround for the 364296 ARM1136
  1132. r0p2 erratum (possible cache data corruption with
  1133. hit-under-miss enabled). It sets the undocumented bit 31 in
  1134. the auxiliary control register and the FI bit in the control
  1135. register, thus disabling hit-under-miss without putting the
  1136. processor into full low interrupt latency mode. ARM11MPCore
  1137. is not affected.
  1138. config ARM_ERRATA_764369
  1139. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1140. depends on CPU_V7 && SMP
  1141. help
  1142. This option enables the workaround for erratum 764369
  1143. affecting Cortex-A9 MPCore with two or more processors (all
  1144. current revisions). Under certain timing circumstances, a data
  1145. cache line maintenance operation by MVA targeting an Inner
  1146. Shareable memory region may fail to proceed up to either the
  1147. Point of Coherency or to the Point of Unification of the
  1148. system. This workaround adds a DSB instruction before the
  1149. relevant cache maintenance functions and sets a specific bit
  1150. in the diagnostic control register of the SCU.
  1151. endmenu
  1152. source "arch/arm/common/Kconfig"
  1153. menu "Bus support"
  1154. config ARM_AMBA
  1155. bool
  1156. config ISA
  1157. bool
  1158. help
  1159. Find out whether you have ISA slots on your motherboard. ISA is the
  1160. name of a bus system, i.e. the way the CPU talks to the other stuff
  1161. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1162. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1163. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1164. # Select ISA DMA controller support
  1165. config ISA_DMA
  1166. bool
  1167. select ISA_DMA_API
  1168. # Select ISA DMA interface
  1169. config ISA_DMA_API
  1170. bool
  1171. config PCI
  1172. bool "PCI support" if MIGHT_HAVE_PCI
  1173. help
  1174. Find out whether you have a PCI motherboard. PCI is the name of a
  1175. bus system, i.e. the way the CPU talks to the other stuff inside
  1176. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1177. VESA. If you have PCI, say Y, otherwise N.
  1178. config PCI_DOMAINS
  1179. bool
  1180. depends on PCI
  1181. config PCI_NANOENGINE
  1182. bool "BSE nanoEngine PCI support"
  1183. depends on SA1100_NANOENGINE
  1184. help
  1185. Enable PCI on the BSE nanoEngine board.
  1186. config PCI_SYSCALL
  1187. def_bool PCI
  1188. # Select the host bridge type
  1189. config PCI_HOST_VIA82C505
  1190. bool
  1191. depends on PCI && ARCH_SHARK
  1192. default y
  1193. config PCI_HOST_ITE8152
  1194. bool
  1195. depends on PCI && MACH_ARMCORE
  1196. default y
  1197. select DMABOUNCE
  1198. source "drivers/pci/Kconfig"
  1199. source "drivers/pcmcia/Kconfig"
  1200. endmenu
  1201. menu "Kernel Features"
  1202. source "kernel/time/Kconfig"
  1203. config SMP
  1204. bool "Symmetric Multi-Processing"
  1205. depends on CPU_V6K || CPU_V7
  1206. depends on GENERIC_CLOCKEVENTS
  1207. depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
  1208. MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
  1209. ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
  1210. ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE || ARCH_HIGHBANK
  1211. select USE_GENERIC_SMP_HELPERS
  1212. select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
  1213. help
  1214. This enables support for systems with more than one CPU. If you have
  1215. a system with only one CPU, like most personal computers, say N. If
  1216. you have a system with more than one CPU, say Y.
  1217. If you say N here, the kernel will run on single and multiprocessor
  1218. machines, but will use only one CPU of a multiprocessor machine. If
  1219. you say Y here, the kernel will run on many, but not all, single
  1220. processor machines. On a single processor machine, the kernel will
  1221. run faster if you say N here.
  1222. See also <file:Documentation/i386/IO-APIC.txt>,
  1223. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1224. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1225. If you don't know what to do here, say N.
  1226. config SMP_ON_UP
  1227. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1228. depends on EXPERIMENTAL
  1229. depends on SMP && !XIP_KERNEL
  1230. default y
  1231. help
  1232. SMP kernels contain instructions which fail on non-SMP processors.
  1233. Enabling this option allows the kernel to modify itself to make
  1234. these instructions safe. Disabling it allows about 1K of space
  1235. savings.
  1236. If you don't know what to do here, say Y.
  1237. config ARM_CPU_TOPOLOGY
  1238. bool "Support cpu topology definition"
  1239. depends on SMP && CPU_V7
  1240. default y
  1241. help
  1242. Support ARM cpu topology definition. The MPIDR register defines
  1243. affinity between processors which is then used to describe the cpu
  1244. topology of an ARM System.
  1245. config SCHED_MC
  1246. bool "Multi-core scheduler support"
  1247. depends on ARM_CPU_TOPOLOGY
  1248. help
  1249. Multi-core scheduler support improves the CPU scheduler's decision
  1250. making when dealing with multi-core CPU chips at a cost of slightly
  1251. increased overhead in some places. If unsure say N here.
  1252. config SCHED_SMT
  1253. bool "SMT scheduler support"
  1254. depends on ARM_CPU_TOPOLOGY
  1255. help
  1256. Improves the CPU scheduler's decision making when dealing with
  1257. MultiThreading at a cost of slightly increased overhead in some
  1258. places. If unsure say N here.
  1259. config HAVE_ARM_SCU
  1260. bool
  1261. help
  1262. This option enables support for the ARM system coherency unit
  1263. config HAVE_ARM_TWD
  1264. bool
  1265. depends on SMP
  1266. select TICK_ONESHOT
  1267. help
  1268. This options enables support for the ARM timer and watchdog unit
  1269. choice
  1270. prompt "Memory split"
  1271. default VMSPLIT_3G
  1272. help
  1273. Select the desired split between kernel and user memory.
  1274. If you are not absolutely sure what you are doing, leave this
  1275. option alone!
  1276. config VMSPLIT_3G
  1277. bool "3G/1G user/kernel split"
  1278. config VMSPLIT_2G
  1279. bool "2G/2G user/kernel split"
  1280. config VMSPLIT_1G
  1281. bool "1G/3G user/kernel split"
  1282. endchoice
  1283. config PAGE_OFFSET
  1284. hex
  1285. default 0x40000000 if VMSPLIT_1G
  1286. default 0x80000000 if VMSPLIT_2G
  1287. default 0xC0000000
  1288. config NR_CPUS
  1289. int "Maximum number of CPUs (2-32)"
  1290. range 2 32
  1291. depends on SMP
  1292. default "4"
  1293. config HOTPLUG_CPU
  1294. bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
  1295. depends on SMP && HOTPLUG && EXPERIMENTAL
  1296. help
  1297. Say Y here to experiment with turning CPUs off and on. CPUs
  1298. can be controlled through /sys/devices/system/cpu.
  1299. config LOCAL_TIMERS
  1300. bool "Use local timer interrupts"
  1301. depends on SMP
  1302. default y
  1303. select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
  1304. help
  1305. Enable support for local timers on SMP platforms, rather then the
  1306. legacy IPI broadcast method. Local timers allows the system
  1307. accounting to be spread across the timer interval, preventing a
  1308. "thundering herd" at every timer tick.
  1309. source kernel/Kconfig.preempt
  1310. config HZ
  1311. int
  1312. default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P64X0 || \
  1313. ARCH_S5PV210 || ARCH_EXYNOS4
  1314. default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
  1315. default AT91_TIMER_HZ if ARCH_AT91
  1316. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1317. default 100
  1318. config THUMB2_KERNEL
  1319. bool "Compile the kernel in Thumb-2 mode (EXPERIMENTAL)"
  1320. depends on CPU_V7 && !CPU_V6 && !CPU_V6K && EXPERIMENTAL
  1321. select AEABI
  1322. select ARM_ASM_UNIFIED
  1323. help
  1324. By enabling this option, the kernel will be compiled in
  1325. Thumb-2 mode. A compiler/assembler that understand the unified
  1326. ARM-Thumb syntax is needed.
  1327. If unsure, say N.
  1328. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1329. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1330. depends on THUMB2_KERNEL && MODULES
  1331. default y
  1332. help
  1333. Various binutils versions can resolve Thumb-2 branches to
  1334. locally-defined, preemptible global symbols as short-range "b.n"
  1335. branch instructions.
  1336. This is a problem, because there's no guarantee the final
  1337. destination of the symbol, or any candidate locations for a
  1338. trampoline, are within range of the branch. For this reason, the
  1339. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1340. relocation in modules at all, and it makes little sense to add
  1341. support.
  1342. The symptom is that the kernel fails with an "unsupported
  1343. relocation" error when loading some modules.
  1344. Until fixed tools are available, passing
  1345. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1346. code which hits this problem, at the cost of a bit of extra runtime
  1347. stack usage in some cases.
  1348. The problem is described in more detail at:
  1349. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1350. Only Thumb-2 kernels are affected.
  1351. Unless you are sure your tools don't have this problem, say Y.
  1352. config ARM_ASM_UNIFIED
  1353. bool
  1354. config AEABI
  1355. bool "Use the ARM EABI to compile the kernel"
  1356. help
  1357. This option allows for the kernel to be compiled using the latest
  1358. ARM ABI (aka EABI). This is only useful if you are using a user
  1359. space environment that is also compiled with EABI.
  1360. Since there are major incompatibilities between the legacy ABI and
  1361. EABI, especially with regard to structure member alignment, this
  1362. option also changes the kernel syscall calling convention to
  1363. disambiguate both ABIs and allow for backward compatibility support
  1364. (selected with CONFIG_OABI_COMPAT).
  1365. To use this you need GCC version 4.0.0 or later.
  1366. config OABI_COMPAT
  1367. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1368. depends on AEABI && EXPERIMENTAL && !THUMB2_KERNEL
  1369. default y
  1370. help
  1371. This option preserves the old syscall interface along with the
  1372. new (ARM EABI) one. It also provides a compatibility layer to
  1373. intercept syscalls that have structure arguments which layout
  1374. in memory differs between the legacy ABI and the new ARM EABI
  1375. (only for non "thumb" binaries). This option adds a tiny
  1376. overhead to all syscalls and produces a slightly larger kernel.
  1377. If you know you'll be using only pure EABI user space then you
  1378. can say N here. If this option is not selected and you attempt
  1379. to execute a legacy ABI binary then the result will be
  1380. UNPREDICTABLE (in fact it can be predicted that it won't work
  1381. at all). If in doubt say Y.
  1382. config ARCH_HAS_HOLES_MEMORYMODEL
  1383. bool
  1384. config ARCH_SPARSEMEM_ENABLE
  1385. bool
  1386. config ARCH_SPARSEMEM_DEFAULT
  1387. def_bool ARCH_SPARSEMEM_ENABLE
  1388. config ARCH_SELECT_MEMORY_MODEL
  1389. def_bool ARCH_SPARSEMEM_ENABLE
  1390. config HAVE_ARCH_PFN_VALID
  1391. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1392. config HIGHMEM
  1393. bool "High Memory Support"
  1394. depends on MMU
  1395. help
  1396. The address space of ARM processors is only 4 Gigabytes large
  1397. and it has to accommodate user address space, kernel address
  1398. space as well as some memory mapped IO. That means that, if you
  1399. have a large amount of physical memory and/or IO, not all of the
  1400. memory can be "permanently mapped" by the kernel. The physical
  1401. memory that is not permanently mapped is called "high memory".
  1402. Depending on the selected kernel/user memory split, minimum
  1403. vmalloc space and actual amount of RAM, you may not need this
  1404. option which should result in a slightly faster kernel.
  1405. If unsure, say n.
  1406. config HIGHPTE
  1407. bool "Allocate 2nd-level pagetables from highmem"
  1408. depends on HIGHMEM
  1409. config HW_PERF_EVENTS
  1410. bool "Enable hardware performance counter support for perf events"
  1411. depends on PERF_EVENTS && CPU_HAS_PMU
  1412. default y
  1413. help
  1414. Enable hardware performance counter support for perf events. If
  1415. disabled, perf events will use software events only.
  1416. source "mm/Kconfig"
  1417. config FORCE_MAX_ZONEORDER
  1418. int "Maximum zone order" if ARCH_SHMOBILE
  1419. range 11 64 if ARCH_SHMOBILE
  1420. default "9" if SA1111
  1421. default "11"
  1422. help
  1423. The kernel memory allocator divides physically contiguous memory
  1424. blocks into "zones", where each zone is a power of two number of
  1425. pages. This option selects the largest power of two that the kernel
  1426. keeps in the memory allocator. If you need to allocate very large
  1427. blocks of physically contiguous memory, then you may need to
  1428. increase this value.
  1429. This config option is actually maximum order plus one. For example,
  1430. a value of 11 means that the largest free memory block is 2^10 pages.
  1431. config LEDS
  1432. bool "Timer and CPU usage LEDs"
  1433. depends on ARCH_CDB89712 || ARCH_EBSA110 || \
  1434. ARCH_EBSA285 || ARCH_INTEGRATOR || \
  1435. ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
  1436. ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
  1437. ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
  1438. ARCH_AT91 || ARCH_DAVINCI || \
  1439. ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
  1440. help
  1441. If you say Y here, the LEDs on your machine will be used
  1442. to provide useful information about your current system status.
  1443. If you are compiling a kernel for a NetWinder or EBSA-285, you will
  1444. be able to select which LEDs are active using the options below. If
  1445. you are compiling a kernel for the EBSA-110 or the LART however, the
  1446. red LED will simply flash regularly to indicate that the system is
  1447. still functional. It is safe to say Y here if you have a CATS
  1448. system, but the driver will do nothing.
  1449. config LEDS_TIMER
  1450. bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
  1451. OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1452. || MACH_OMAP_PERSEUS2
  1453. depends on LEDS
  1454. depends on !GENERIC_CLOCKEVENTS
  1455. default y if ARCH_EBSA110
  1456. help
  1457. If you say Y here, one of the system LEDs (the green one on the
  1458. NetWinder, the amber one on the EBSA285, or the red one on the LART)
  1459. will flash regularly to indicate that the system is still
  1460. operational. This is mainly useful to kernel hackers who are
  1461. debugging unstable kernels.
  1462. The LART uses the same LED for both Timer LED and CPU usage LED
  1463. functions. You may choose to use both, but the Timer LED function
  1464. will overrule the CPU usage LED.
  1465. config LEDS_CPU
  1466. bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
  1467. !ARCH_OMAP) \
  1468. || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
  1469. || MACH_OMAP_PERSEUS2
  1470. depends on LEDS
  1471. help
  1472. If you say Y here, the red LED will be used to give a good real
  1473. time indication of CPU usage, by lighting whenever the idle task
  1474. is not currently executing.
  1475. The LART uses the same LED for both Timer LED and CPU usage LED
  1476. functions. You may choose to use both, but the Timer LED function
  1477. will overrule the CPU usage LED.
  1478. config ALIGNMENT_TRAP
  1479. bool
  1480. depends on CPU_CP15_MMU
  1481. default y if !ARCH_EBSA110
  1482. select HAVE_PROC_CPU if PROC_FS
  1483. help
  1484. ARM processors cannot fetch/store information which is not
  1485. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1486. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1487. fetch/store instructions will be emulated in software if you say
  1488. here, which has a severe performance impact. This is necessary for
  1489. correct operation of some network protocols. With an IP-only
  1490. configuration it is safe to say N, otherwise say Y.
  1491. config UACCESS_WITH_MEMCPY
  1492. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
  1493. depends on MMU && EXPERIMENTAL
  1494. default y if CPU_FEROCEON
  1495. help
  1496. Implement faster copy_to_user and clear_user methods for CPU
  1497. cores where a 8-word STM instruction give significantly higher
  1498. memory write throughput than a sequence of individual 32bit stores.
  1499. A possible side effect is a slight increase in scheduling latency
  1500. between threads sharing the same address space if they invoke
  1501. such copy operations with large buffers.
  1502. However, if the CPU data cache is using a write-allocate mode,
  1503. this option is unlikely to provide any performance gain.
  1504. config SECCOMP
  1505. bool
  1506. prompt "Enable seccomp to safely compute untrusted bytecode"
  1507. ---help---
  1508. This kernel feature is useful for number crunching applications
  1509. that may need to compute untrusted bytecode during their
  1510. execution. By using pipes or other transports made available to
  1511. the process as file descriptors supporting the read/write
  1512. syscalls, it's possible to isolate those applications in
  1513. their own address space using seccomp. Once seccomp is
  1514. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1515. and the task is only allowed to execute a few safe syscalls
  1516. defined by each seccomp mode.
  1517. config CC_STACKPROTECTOR
  1518. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1519. depends on EXPERIMENTAL
  1520. help
  1521. This option turns on the -fstack-protector GCC feature. This
  1522. feature puts, at the beginning of functions, a canary value on
  1523. the stack just before the return address, and validates
  1524. the value just before actually returning. Stack based buffer
  1525. overflows (that need to overwrite this return address) now also
  1526. overwrite the canary, which gets detected and the attack is then
  1527. neutralized via a kernel panic.
  1528. This feature requires gcc version 4.2 or above.
  1529. config DEPRECATED_PARAM_STRUCT
  1530. bool "Provide old way to pass kernel parameters"
  1531. help
  1532. This was deprecated in 2001 and announced to live on for 5 years.
  1533. Some old boot loaders still use this way.
  1534. endmenu
  1535. menu "Boot options"
  1536. config USE_OF
  1537. bool "Flattened Device Tree support"
  1538. select OF
  1539. select OF_EARLY_FLATTREE
  1540. select IRQ_DOMAIN
  1541. help
  1542. Include support for flattened device tree machine descriptions.
  1543. # Compressed boot loader in ROM. Yes, we really want to ask about
  1544. # TEXT and BSS so we preserve their values in the config files.
  1545. config ZBOOT_ROM_TEXT
  1546. hex "Compressed ROM boot loader base address"
  1547. default "0"
  1548. help
  1549. The physical address at which the ROM-able zImage is to be
  1550. placed in the target. Platforms which normally make use of
  1551. ROM-able zImage formats normally set this to a suitable
  1552. value in their defconfig file.
  1553. If ZBOOT_ROM is not enabled, this has no effect.
  1554. config ZBOOT_ROM_BSS
  1555. hex "Compressed ROM boot loader BSS address"
  1556. default "0"
  1557. help
  1558. The base address of an area of read/write memory in the target
  1559. for the ROM-able zImage which must be available while the
  1560. decompressor is running. It must be large enough to hold the
  1561. entire decompressed kernel plus an additional 128 KiB.
  1562. Platforms which normally make use of ROM-able zImage formats
  1563. normally set this to a suitable value in their defconfig file.
  1564. If ZBOOT_ROM is not enabled, this has no effect.
  1565. config ZBOOT_ROM
  1566. bool "Compressed boot loader in ROM/flash"
  1567. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1568. help
  1569. Say Y here if you intend to execute your compressed kernel image
  1570. (zImage) directly from ROM or flash. If unsure, say N.
  1571. choice
  1572. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1573. depends on ZBOOT_ROM && ARCH_SH7372 && EXPERIMENTAL
  1574. default ZBOOT_ROM_NONE
  1575. help
  1576. Include experimental SD/MMC loading code in the ROM-able zImage.
  1577. With this enabled it is possible to write the the ROM-able zImage
  1578. kernel image to an MMC or SD card and boot the kernel straight
  1579. from the reset vector. At reset the processor Mask ROM will load
  1580. the first part of the the ROM-able zImage which in turn loads the
  1581. rest the kernel image to RAM.
  1582. config ZBOOT_ROM_NONE
  1583. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1584. help
  1585. Do not load image from SD or MMC
  1586. config ZBOOT_ROM_MMCIF
  1587. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1588. help
  1589. Load image from MMCIF hardware block.
  1590. config ZBOOT_ROM_SH_MOBILE_SDHI
  1591. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1592. help
  1593. Load image from SDHI hardware block
  1594. endchoice
  1595. config ARM_APPENDED_DTB
  1596. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1597. depends on OF && !ZBOOT_ROM && EXPERIMENTAL
  1598. help
  1599. With this option, the boot code will look for a device tree binary
  1600. (DTB) appended to zImage
  1601. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1602. This is meant as a backward compatibility convenience for those
  1603. systems with a bootloader that can't be upgraded to accommodate
  1604. the documented boot protocol using a device tree.
  1605. Beware that there is very little in terms of protection against
  1606. this option being confused by leftover garbage in memory that might
  1607. look like a DTB header after a reboot if no actual DTB is appended
  1608. to zImage. Do not leave this option active in a production kernel
  1609. if you don't intend to always append a DTB. Proper passing of the
  1610. location into r2 of a bootloader provided DTB is always preferable
  1611. to this option.
  1612. config ARM_ATAG_DTB_COMPAT
  1613. bool "Supplement the appended DTB with traditional ATAG information"
  1614. depends on ARM_APPENDED_DTB
  1615. help
  1616. Some old bootloaders can't be updated to a DTB capable one, yet
  1617. they provide ATAGs with memory configuration, the ramdisk address,
  1618. the kernel cmdline string, etc. Such information is dynamically
  1619. provided by the bootloader and can't always be stored in a static
  1620. DTB. To allow a device tree enabled kernel to be used with such
  1621. bootloaders, this option allows zImage to extract the information
  1622. from the ATAG list and store it at run time into the appended DTB.
  1623. config CMDLINE
  1624. string "Default kernel command string"
  1625. default ""
  1626. help
  1627. On some architectures (EBSA110 and CATS), there is currently no way
  1628. for the boot loader to pass arguments to the kernel. For these
  1629. architectures, you should supply some command-line options at build
  1630. time by entering them here. As a minimum, you should specify the
  1631. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1632. choice
  1633. prompt "Kernel command line type" if CMDLINE != ""
  1634. default CMDLINE_FROM_BOOTLOADER
  1635. config CMDLINE_FROM_BOOTLOADER
  1636. bool "Use bootloader kernel arguments if available"
  1637. help
  1638. Uses the command-line options passed by the boot loader. If
  1639. the boot loader doesn't provide any, the default kernel command
  1640. string provided in CMDLINE will be used.
  1641. config CMDLINE_EXTEND
  1642. bool "Extend bootloader kernel arguments"
  1643. help
  1644. The command-line arguments provided by the boot loader will be
  1645. appended to the default kernel command string.
  1646. config CMDLINE_FORCE
  1647. bool "Always use the default kernel command string"
  1648. help
  1649. Always use the default kernel command string, even if the boot
  1650. loader passes other arguments to the kernel.
  1651. This is useful if you cannot or don't want to change the
  1652. command-line options your boot loader passes to the kernel.
  1653. endchoice
  1654. config XIP_KERNEL
  1655. bool "Kernel Execute-In-Place from ROM"
  1656. depends on !ZBOOT_ROM
  1657. help
  1658. Execute-In-Place allows the kernel to run from non-volatile storage
  1659. directly addressable by the CPU, such as NOR flash. This saves RAM
  1660. space since the text section of the kernel is not loaded from flash
  1661. to RAM. Read-write sections, such as the data section and stack,
  1662. are still copied to RAM. The XIP kernel is not compressed since
  1663. it has to run directly from flash, so it will take more space to
  1664. store it. The flash address used to link the kernel object files,
  1665. and for storing it, is configuration dependent. Therefore, if you
  1666. say Y here, you must know the proper physical address where to
  1667. store the kernel image depending on your own flash memory usage.
  1668. Also note that the make target becomes "make xipImage" rather than
  1669. "make zImage" or "make Image". The final kernel binary to put in
  1670. ROM memory will be arch/arm/boot/xipImage.
  1671. If unsure, say N.
  1672. config XIP_PHYS_ADDR
  1673. hex "XIP Kernel Physical Location"
  1674. depends on XIP_KERNEL
  1675. default "0x00080000"
  1676. help
  1677. This is the physical address in your flash memory the kernel will
  1678. be linked for and stored to. This address is dependent on your
  1679. own flash usage.
  1680. config KEXEC
  1681. bool "Kexec system call (EXPERIMENTAL)"
  1682. depends on EXPERIMENTAL
  1683. help
  1684. kexec is a system call that implements the ability to shutdown your
  1685. current kernel, and to start another kernel. It is like a reboot
  1686. but it is independent of the system firmware. And like a reboot
  1687. you can start any kernel with it, not just Linux.
  1688. It is an ongoing process to be certain the hardware in a machine
  1689. is properly shutdown, so do not be surprised if this code does not
  1690. initially work for you. It may help to enable device hotplugging
  1691. support.
  1692. config ATAGS_PROC
  1693. bool "Export atags in procfs"
  1694. depends on KEXEC
  1695. default y
  1696. help
  1697. Should the atags used to boot the kernel be exported in an "atags"
  1698. file in procfs. Useful with kexec.
  1699. config CRASH_DUMP
  1700. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1701. depends on EXPERIMENTAL
  1702. help
  1703. Generate crash dump after being started by kexec. This should
  1704. be normally only set in special crash dump kernels which are
  1705. loaded in the main kernel with kexec-tools into a specially
  1706. reserved region and then later executed after a crash by
  1707. kdump/kexec. The crash dump kernel must be compiled to a
  1708. memory address not used by the main kernel
  1709. For more details see Documentation/kdump/kdump.txt
  1710. config AUTO_ZRELADDR
  1711. bool "Auto calculation of the decompressed kernel image address"
  1712. depends on !ZBOOT_ROM && !ARCH_U300
  1713. help
  1714. ZRELADDR is the physical address where the decompressed kernel
  1715. image will be placed. If AUTO_ZRELADDR is selected, the address
  1716. will be determined at run-time by masking the current IP with
  1717. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1718. from start of memory.
  1719. endmenu
  1720. menu "CPU Power Management"
  1721. if ARCH_HAS_CPUFREQ
  1722. source "drivers/cpufreq/Kconfig"
  1723. config CPU_FREQ_IMX
  1724. tristate "CPUfreq driver for i.MX CPUs"
  1725. depends on ARCH_MXC && CPU_FREQ
  1726. help
  1727. This enables the CPUfreq driver for i.MX CPUs.
  1728. config CPU_FREQ_SA1100
  1729. bool
  1730. config CPU_FREQ_SA1110
  1731. bool
  1732. config CPU_FREQ_INTEGRATOR
  1733. tristate "CPUfreq driver for ARM Integrator CPUs"
  1734. depends on ARCH_INTEGRATOR && CPU_FREQ
  1735. default y
  1736. help
  1737. This enables the CPUfreq driver for ARM Integrator CPUs.
  1738. For details, take a look at <file:Documentation/cpu-freq>.
  1739. If in doubt, say Y.
  1740. config CPU_FREQ_PXA
  1741. bool
  1742. depends on CPU_FREQ && ARCH_PXA && PXA25x
  1743. default y
  1744. select CPU_FREQ_DEFAULT_GOV_USERSPACE
  1745. config CPU_FREQ_S3C
  1746. bool
  1747. help
  1748. Internal configuration node for common cpufreq on Samsung SoC
  1749. config CPU_FREQ_S3C24XX
  1750. bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
  1751. depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
  1752. select CPU_FREQ_S3C
  1753. help
  1754. This enables the CPUfreq driver for the Samsung S3C24XX family
  1755. of CPUs.
  1756. For details, take a look at <file:Documentation/cpu-freq>.
  1757. If in doubt, say N.
  1758. config CPU_FREQ_S3C24XX_PLL
  1759. bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)"
  1760. depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
  1761. help
  1762. Compile in support for changing the PLL frequency from the
  1763. S3C24XX series CPUfreq driver. The PLL takes time to settle
  1764. after a frequency change, so by default it is not enabled.
  1765. This also means that the PLL tables for the selected CPU(s) will
  1766. be built which may increase the size of the kernel image.
  1767. config CPU_FREQ_S3C24XX_DEBUG
  1768. bool "Debug CPUfreq Samsung driver core"
  1769. depends on CPU_FREQ_S3C24XX
  1770. help
  1771. Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
  1772. config CPU_FREQ_S3C24XX_IODEBUG
  1773. bool "Debug CPUfreq Samsung driver IO timing"
  1774. depends on CPU_FREQ_S3C24XX
  1775. help
  1776. Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
  1777. config CPU_FREQ_S3C24XX_DEBUGFS
  1778. bool "Export debugfs for CPUFreq"
  1779. depends on CPU_FREQ_S3C24XX && DEBUG_FS
  1780. help
  1781. Export status information via debugfs.
  1782. endif
  1783. source "drivers/cpuidle/Kconfig"
  1784. endmenu
  1785. menu "Floating point emulation"
  1786. comment "At least one emulation must be selected"
  1787. config FPE_NWFPE
  1788. bool "NWFPE math emulation"
  1789. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1790. ---help---
  1791. Say Y to include the NWFPE floating point emulator in the kernel.
  1792. This is necessary to run most binaries. Linux does not currently
  1793. support floating point hardware so you need to say Y here even if
  1794. your machine has an FPA or floating point co-processor podule.
  1795. You may say N here if you are going to load the Acorn FPEmulator
  1796. early in the bootup.
  1797. config FPE_NWFPE_XP
  1798. bool "Support extended precision"
  1799. depends on FPE_NWFPE
  1800. help
  1801. Say Y to include 80-bit support in the kernel floating-point
  1802. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1803. Note that gcc does not generate 80-bit operations by default,
  1804. so in most cases this option only enlarges the size of the
  1805. floating point emulator without any good reason.
  1806. You almost surely want to say N here.
  1807. config FPE_FASTFPE
  1808. bool "FastFPE math emulation (EXPERIMENTAL)"
  1809. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
  1810. ---help---
  1811. Say Y here to include the FAST floating point emulator in the kernel.
  1812. This is an experimental much faster emulator which now also has full
  1813. precision for the mantissa. It does not support any exceptions.
  1814. It is very simple, and approximately 3-6 times faster than NWFPE.
  1815. It should be sufficient for most programs. It may be not suitable
  1816. for scientific calculations, but you have to check this for yourself.
  1817. If you do not feel you need a faster FP emulation you should better
  1818. choose NWFPE.
  1819. config VFP
  1820. bool "VFP-format floating point maths"
  1821. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1822. help
  1823. Say Y to include VFP support code in the kernel. This is needed
  1824. if your hardware includes a VFP unit.
  1825. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1826. release notes and additional status information.
  1827. Say N if your target does not have VFP hardware.
  1828. config VFPv3
  1829. bool
  1830. depends on VFP
  1831. default y if CPU_V7
  1832. config NEON
  1833. bool "Advanced SIMD (NEON) Extension support"
  1834. depends on VFPv3 && CPU_V7
  1835. help
  1836. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1837. Extension.
  1838. endmenu
  1839. menu "Userspace binary formats"
  1840. source "fs/Kconfig.binfmt"
  1841. config ARTHUR
  1842. tristate "RISC OS personality"
  1843. depends on !AEABI
  1844. help
  1845. Say Y here to include the kernel code necessary if you want to run
  1846. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1847. experimental; if this sounds frightening, say N and sleep in peace.
  1848. You can also say M here to compile this support as a module (which
  1849. will be called arthur).
  1850. endmenu
  1851. menu "Power management options"
  1852. source "kernel/power/Kconfig"
  1853. config ARCH_SUSPEND_POSSIBLE
  1854. depends on !ARCH_S5P64X0 && !ARCH_S5PC100
  1855. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1856. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE
  1857. def_bool y
  1858. endmenu
  1859. source "net/Kconfig"
  1860. source "drivers/Kconfig"
  1861. source "fs/Kconfig"
  1862. source "arch/arm/Kconfig.debug"
  1863. source "security/Kconfig"
  1864. source "crypto/Kconfig"
  1865. source "lib/Kconfig"