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