Kconfig 64 KB

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  1. config ARM
  2. bool
  3. default y
  4. select ARCH_BINFMT_ELF_RANDOMIZE_PIE
  5. select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  6. select ARCH_HAVE_CUSTOM_GPIO_H
  7. select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
  8. select ARCH_WANT_IPC_PARSE_VERSION
  9. select BUILDTIME_EXTABLE_SORT if MMU
  10. select CPU_PM if (SUSPEND || CPU_IDLE)
  11. select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
  12. select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
  13. select GENERIC_CLOCKEVENTS_BROADCAST if SMP
  14. select GENERIC_IRQ_PROBE
  15. select GENERIC_IRQ_SHOW
  16. select GENERIC_PCI_IOMAP
  17. select GENERIC_SCHED_CLOCK
  18. select GENERIC_SMP_IDLE_THREAD
  19. select GENERIC_IDLE_POLL_SETUP
  20. select GENERIC_STRNCPY_FROM_USER
  21. select GENERIC_STRNLEN_USER
  22. select HARDIRQS_SW_RESEND
  23. select HAVE_AOUT
  24. select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
  25. select HAVE_ARCH_KGDB
  26. select HAVE_ARCH_SECCOMP_FILTER
  27. select HAVE_ARCH_TRACEHOOK
  28. select HAVE_BPF_JIT
  29. select HAVE_C_RECORDMCOUNT
  30. select HAVE_DEBUG_KMEMLEAK
  31. select HAVE_DMA_API_DEBUG
  32. select HAVE_DMA_ATTRS
  33. select HAVE_DMA_CONTIGUOUS if MMU
  34. select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
  35. select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
  36. select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
  37. select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
  38. select HAVE_GENERIC_DMA_COHERENT
  39. select HAVE_GENERIC_HARDIRQS
  40. select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
  41. select HAVE_IDE if PCI || ISA || PCMCIA
  42. select HAVE_IRQ_TIME_ACCOUNTING
  43. select HAVE_KERNEL_GZIP
  44. select HAVE_KERNEL_LZ4
  45. select HAVE_KERNEL_LZMA
  46. select HAVE_KERNEL_LZO
  47. select HAVE_KERNEL_XZ
  48. select HAVE_KPROBES if !XIP_KERNEL
  49. select HAVE_KRETPROBES if (HAVE_KPROBES)
  50. select HAVE_MEMBLOCK
  51. select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
  52. select HAVE_PERF_EVENTS
  53. select HAVE_REGS_AND_STACK_ACCESS_API
  54. select HAVE_SYSCALL_TRACEPOINTS
  55. select HAVE_UID16
  56. select KTIME_SCALAR
  57. select PERF_USE_VMALLOC
  58. select RTC_LIB
  59. select SYS_SUPPORTS_APM_EMULATION
  60. select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
  61. select MODULES_USE_ELF_REL
  62. select CLONE_BACKWARDS
  63. select OLD_SIGSUSPEND3
  64. select OLD_SIGACTION
  65. select HAVE_CONTEXT_TRACKING
  66. help
  67. The ARM series is a line of low-power-consumption RISC chip designs
  68. licensed by ARM Ltd and targeted at embedded applications and
  69. handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
  70. manufactured, but legacy ARM-based PC hardware remains popular in
  71. Europe. There is an ARM Linux project with a web page at
  72. <http://www.arm.linux.org.uk/>.
  73. config ARM_HAS_SG_CHAIN
  74. bool
  75. config NEED_SG_DMA_LENGTH
  76. bool
  77. config ARM_DMA_USE_IOMMU
  78. bool
  79. select ARM_HAS_SG_CHAIN
  80. select NEED_SG_DMA_LENGTH
  81. if ARM_DMA_USE_IOMMU
  82. config ARM_DMA_IOMMU_ALIGNMENT
  83. int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
  84. range 4 9
  85. default 8
  86. help
  87. DMA mapping framework by default aligns all buffers to the smallest
  88. PAGE_SIZE order which is greater than or equal to the requested buffer
  89. size. This works well for buffers up to a few hundreds kilobytes, but
  90. for larger buffers it just a waste of address space. Drivers which has
  91. relatively small addressing window (like 64Mib) might run out of
  92. virtual space with just a few allocations.
  93. With this parameter you can specify the maximum PAGE_SIZE order for
  94. DMA IOMMU buffers. Larger buffers will be aligned only to this
  95. specified order. The order is expressed as a power of two multiplied
  96. by the PAGE_SIZE.
  97. endif
  98. config HAVE_PWM
  99. bool
  100. config MIGHT_HAVE_PCI
  101. bool
  102. config SYS_SUPPORTS_APM_EMULATION
  103. bool
  104. config HAVE_TCM
  105. bool
  106. select GENERIC_ALLOCATOR
  107. config HAVE_PROC_CPU
  108. bool
  109. config NO_IOPORT
  110. bool
  111. config EISA
  112. bool
  113. ---help---
  114. The Extended Industry Standard Architecture (EISA) bus was
  115. developed as an open alternative to the IBM MicroChannel bus.
  116. The EISA bus provided some of the features of the IBM MicroChannel
  117. bus while maintaining backward compatibility with cards made for
  118. the older ISA bus. The EISA bus saw limited use between 1988 and
  119. 1995 when it was made obsolete by the PCI bus.
  120. Say Y here if you are building a kernel for an EISA-based machine.
  121. Otherwise, say N.
  122. config SBUS
  123. bool
  124. config STACKTRACE_SUPPORT
  125. bool
  126. default y
  127. config HAVE_LATENCYTOP_SUPPORT
  128. bool
  129. depends on !SMP
  130. default y
  131. config LOCKDEP_SUPPORT
  132. bool
  133. default y
  134. config TRACE_IRQFLAGS_SUPPORT
  135. bool
  136. default y
  137. config RWSEM_GENERIC_SPINLOCK
  138. bool
  139. default y
  140. config RWSEM_XCHGADD_ALGORITHM
  141. bool
  142. config ARCH_HAS_ILOG2_U32
  143. bool
  144. config ARCH_HAS_ILOG2_U64
  145. bool
  146. config ARCH_HAS_CPUFREQ
  147. bool
  148. help
  149. Internal node to signify that the ARCH has CPUFREQ support
  150. and that the relevant menu configurations are displayed for
  151. it.
  152. config ARCH_HAS_BANDGAP
  153. bool
  154. config GENERIC_HWEIGHT
  155. bool
  156. default y
  157. config GENERIC_CALIBRATE_DELAY
  158. bool
  159. default y
  160. config ARCH_MAY_HAVE_PC_FDC
  161. bool
  162. config ZONE_DMA
  163. bool
  164. config NEED_DMA_MAP_STATE
  165. def_bool y
  166. config ARCH_HAS_DMA_SET_COHERENT_MASK
  167. bool
  168. config GENERIC_ISA_DMA
  169. bool
  170. config FIQ
  171. bool
  172. config NEED_RET_TO_USER
  173. bool
  174. config ARCH_MTD_XIP
  175. bool
  176. config VECTORS_BASE
  177. hex
  178. default 0xffff0000 if MMU || CPU_HIGH_VECTOR
  179. default DRAM_BASE if REMAP_VECTORS_TO_RAM
  180. default 0x00000000
  181. help
  182. The base address of exception vectors.
  183. config ARM_PATCH_PHYS_VIRT
  184. bool "Patch physical to virtual translations at runtime" if EMBEDDED
  185. default y
  186. depends on !XIP_KERNEL && MMU
  187. depends on !ARCH_REALVIEW || !SPARSEMEM
  188. help
  189. Patch phys-to-virt and virt-to-phys translation functions at
  190. boot and module load time according to the position of the
  191. kernel in system memory.
  192. This can only be used with non-XIP MMU kernels where the base
  193. of physical memory is at a 16MB boundary.
  194. Only disable this option if you know that you do not require
  195. this feature (eg, building a kernel for a single machine) and
  196. you need to shrink the kernel to the minimal size.
  197. config NEED_MACH_GPIO_H
  198. bool
  199. help
  200. Select this when mach/gpio.h is required to provide special
  201. definitions for this platform. The need for mach/gpio.h should
  202. be avoided when possible.
  203. config NEED_MACH_IO_H
  204. bool
  205. help
  206. Select this when mach/io.h is required to provide special
  207. definitions for this platform. The need for mach/io.h should
  208. be avoided when possible.
  209. config NEED_MACH_MEMORY_H
  210. bool
  211. help
  212. Select this when mach/memory.h is required to provide special
  213. definitions for this platform. The need for mach/memory.h should
  214. be avoided when possible.
  215. config PHYS_OFFSET
  216. hex "Physical address of main memory" if MMU
  217. depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H
  218. default DRAM_BASE if !MMU
  219. help
  220. Please provide the physical address corresponding to the
  221. location of main memory in your system.
  222. config GENERIC_BUG
  223. def_bool y
  224. depends on BUG
  225. source "init/Kconfig"
  226. source "kernel/Kconfig.freezer"
  227. menu "System Type"
  228. config MMU
  229. bool "MMU-based Paged Memory Management Support"
  230. default y
  231. help
  232. Select if you want MMU-based virtualised addressing space
  233. support by paged memory management. If unsure, say 'Y'.
  234. #
  235. # The "ARM system type" choice list is ordered alphabetically by option
  236. # text. Please add new entries in the option alphabetic order.
  237. #
  238. choice
  239. prompt "ARM system type"
  240. default ARCH_VERSATILE if !MMU
  241. default ARCH_MULTIPLATFORM if MMU
  242. config ARCH_MULTIPLATFORM
  243. bool "Allow multiple platforms to be selected"
  244. depends on MMU
  245. select ARM_PATCH_PHYS_VIRT
  246. select AUTO_ZRELADDR
  247. select COMMON_CLK
  248. select MULTI_IRQ_HANDLER
  249. select SPARSE_IRQ
  250. select USE_OF
  251. config ARCH_INTEGRATOR
  252. bool "ARM Ltd. Integrator family"
  253. select ARCH_HAS_CPUFREQ
  254. select ARM_AMBA
  255. select COMMON_CLK
  256. select COMMON_CLK_VERSATILE
  257. select GENERIC_CLOCKEVENTS
  258. select HAVE_TCM
  259. select ICST
  260. select MULTI_IRQ_HANDLER
  261. select NEED_MACH_MEMORY_H
  262. select PLAT_VERSATILE
  263. select SPARSE_IRQ
  264. select VERSATILE_FPGA_IRQ
  265. help
  266. Support for ARM's Integrator platform.
  267. config ARCH_REALVIEW
  268. bool "ARM Ltd. RealView family"
  269. select ARCH_WANT_OPTIONAL_GPIOLIB
  270. select ARM_AMBA
  271. select ARM_TIMER_SP804
  272. select COMMON_CLK
  273. select COMMON_CLK_VERSATILE
  274. select GENERIC_CLOCKEVENTS
  275. select GPIO_PL061 if GPIOLIB
  276. select ICST
  277. select NEED_MACH_MEMORY_H
  278. select PLAT_VERSATILE
  279. select PLAT_VERSATILE_CLCD
  280. help
  281. This enables support for ARM Ltd RealView boards.
  282. config ARCH_VERSATILE
  283. bool "ARM Ltd. Versatile family"
  284. select ARCH_WANT_OPTIONAL_GPIOLIB
  285. select ARM_AMBA
  286. select ARM_TIMER_SP804
  287. select ARM_VIC
  288. select CLKDEV_LOOKUP
  289. select GENERIC_CLOCKEVENTS
  290. select HAVE_MACH_CLKDEV
  291. select ICST
  292. select PLAT_VERSATILE
  293. select PLAT_VERSATILE_CLCD
  294. select PLAT_VERSATILE_CLOCK
  295. select VERSATILE_FPGA_IRQ
  296. help
  297. This enables support for ARM Ltd Versatile board.
  298. config ARCH_AT91
  299. bool "Atmel AT91"
  300. select ARCH_REQUIRE_GPIOLIB
  301. select CLKDEV_LOOKUP
  302. select HAVE_CLK
  303. select IRQ_DOMAIN
  304. select NEED_MACH_GPIO_H
  305. select NEED_MACH_IO_H if PCCARD
  306. select PINCTRL
  307. select PINCTRL_AT91 if USE_OF
  308. help
  309. This enables support for systems based on Atmel
  310. AT91RM9200 and AT91SAM9* processors.
  311. config ARCH_CLPS711X
  312. bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
  313. select ARCH_REQUIRE_GPIOLIB
  314. select AUTO_ZRELADDR
  315. select CLKDEV_LOOKUP
  316. select CLKSRC_MMIO
  317. select COMMON_CLK
  318. select CPU_ARM720T
  319. select GENERIC_CLOCKEVENTS
  320. select MFD_SYSCON
  321. select MULTI_IRQ_HANDLER
  322. select SPARSE_IRQ
  323. help
  324. Support for Cirrus Logic 711x/721x/731x based boards.
  325. config ARCH_GEMINI
  326. bool "Cortina Systems Gemini"
  327. select ARCH_REQUIRE_GPIOLIB
  328. select ARCH_USES_GETTIMEOFFSET
  329. select NEED_MACH_GPIO_H
  330. select CPU_FA526
  331. help
  332. Support for the Cortina Systems Gemini family SoCs
  333. config ARCH_EBSA110
  334. bool "EBSA-110"
  335. select ARCH_USES_GETTIMEOFFSET
  336. select CPU_SA110
  337. select ISA
  338. select NEED_MACH_IO_H
  339. select NEED_MACH_MEMORY_H
  340. select NO_IOPORT
  341. help
  342. This is an evaluation board for the StrongARM processor available
  343. from Digital. It has limited hardware on-board, including an
  344. Ethernet interface, two PCMCIA sockets, two serial ports and a
  345. parallel port.
  346. config ARCH_EP93XX
  347. bool "EP93xx-based"
  348. select ARCH_HAS_HOLES_MEMORYMODEL
  349. select ARCH_REQUIRE_GPIOLIB
  350. select ARCH_USES_GETTIMEOFFSET
  351. select ARM_AMBA
  352. select ARM_VIC
  353. select CLKDEV_LOOKUP
  354. select CPU_ARM920T
  355. select NEED_MACH_MEMORY_H
  356. help
  357. This enables support for the Cirrus EP93xx series of CPUs.
  358. config ARCH_FOOTBRIDGE
  359. bool "FootBridge"
  360. select CPU_SA110
  361. select FOOTBRIDGE
  362. select GENERIC_CLOCKEVENTS
  363. select HAVE_IDE
  364. select NEED_MACH_IO_H if !MMU
  365. select NEED_MACH_MEMORY_H
  366. help
  367. Support for systems based on the DC21285 companion chip
  368. ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
  369. config ARCH_NETX
  370. bool "Hilscher NetX based"
  371. select ARM_VIC
  372. select CLKSRC_MMIO
  373. select CPU_ARM926T
  374. select GENERIC_CLOCKEVENTS
  375. help
  376. This enables support for systems based on the Hilscher NetX Soc
  377. config ARCH_IOP13XX
  378. bool "IOP13xx-based"
  379. depends on MMU
  380. select ARCH_SUPPORTS_MSI
  381. select CPU_XSC3
  382. select NEED_MACH_MEMORY_H
  383. select NEED_RET_TO_USER
  384. select PCI
  385. select PLAT_IOP
  386. select VMSPLIT_1G
  387. help
  388. Support for Intel's IOP13XX (XScale) family of processors.
  389. config ARCH_IOP32X
  390. bool "IOP32x-based"
  391. depends on MMU
  392. select ARCH_REQUIRE_GPIOLIB
  393. select CPU_XSCALE
  394. select NEED_MACH_GPIO_H
  395. select NEED_RET_TO_USER
  396. select PCI
  397. select PLAT_IOP
  398. help
  399. Support for Intel's 80219 and IOP32X (XScale) family of
  400. processors.
  401. config ARCH_IOP33X
  402. bool "IOP33x-based"
  403. depends on MMU
  404. select ARCH_REQUIRE_GPIOLIB
  405. select CPU_XSCALE
  406. select NEED_MACH_GPIO_H
  407. select NEED_RET_TO_USER
  408. select PCI
  409. select PLAT_IOP
  410. help
  411. Support for Intel's IOP33X (XScale) family of processors.
  412. config ARCH_IXP4XX
  413. bool "IXP4xx-based"
  414. depends on MMU
  415. select ARCH_HAS_DMA_SET_COHERENT_MASK
  416. select ARCH_REQUIRE_GPIOLIB
  417. select CLKSRC_MMIO
  418. select CPU_XSCALE
  419. select DMABOUNCE if PCI
  420. select GENERIC_CLOCKEVENTS
  421. select MIGHT_HAVE_PCI
  422. select NEED_MACH_IO_H
  423. select USB_EHCI_BIG_ENDIAN_MMIO
  424. select USB_EHCI_BIG_ENDIAN_DESC
  425. help
  426. Support for Intel's IXP4XX (XScale) family of processors.
  427. config ARCH_DOVE
  428. bool "Marvell Dove"
  429. select ARCH_REQUIRE_GPIOLIB
  430. select CPU_PJ4
  431. select GENERIC_CLOCKEVENTS
  432. select MIGHT_HAVE_PCI
  433. select PINCTRL
  434. select PINCTRL_DOVE
  435. select PLAT_ORION_LEGACY
  436. select USB_ARCH_HAS_EHCI
  437. select MVEBU_MBUS
  438. help
  439. Support for the Marvell Dove SoC 88AP510
  440. config ARCH_KIRKWOOD
  441. bool "Marvell Kirkwood"
  442. select ARCH_HAS_CPUFREQ
  443. select ARCH_REQUIRE_GPIOLIB
  444. select CPU_FEROCEON
  445. select GENERIC_CLOCKEVENTS
  446. select PCI
  447. select PCI_QUIRKS
  448. select PINCTRL
  449. select PINCTRL_KIRKWOOD
  450. select PLAT_ORION_LEGACY
  451. select MVEBU_MBUS
  452. help
  453. Support for the following Marvell Kirkwood series SoCs:
  454. 88F6180, 88F6192 and 88F6281.
  455. config ARCH_MV78XX0
  456. bool "Marvell MV78xx0"
  457. select ARCH_REQUIRE_GPIOLIB
  458. select CPU_FEROCEON
  459. select GENERIC_CLOCKEVENTS
  460. select PCI
  461. select PLAT_ORION_LEGACY
  462. select MVEBU_MBUS
  463. help
  464. Support for the following Marvell MV78xx0 series SoCs:
  465. MV781x0, MV782x0.
  466. config ARCH_ORION5X
  467. bool "Marvell Orion"
  468. depends on MMU
  469. select ARCH_REQUIRE_GPIOLIB
  470. select CPU_FEROCEON
  471. select GENERIC_CLOCKEVENTS
  472. select PCI
  473. select PLAT_ORION_LEGACY
  474. select MVEBU_MBUS
  475. help
  476. Support for the following Marvell Orion 5x series SoCs:
  477. Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
  478. Orion-2 (5281), Orion-1-90 (6183).
  479. config ARCH_MMP
  480. bool "Marvell PXA168/910/MMP2"
  481. depends on MMU
  482. select ARCH_REQUIRE_GPIOLIB
  483. select CLKDEV_LOOKUP
  484. select GENERIC_ALLOCATOR
  485. select GENERIC_CLOCKEVENTS
  486. select GPIO_PXA
  487. select IRQ_DOMAIN
  488. select NEED_MACH_GPIO_H
  489. select PINCTRL
  490. select PLAT_PXA
  491. select SPARSE_IRQ
  492. help
  493. Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
  494. config ARCH_KS8695
  495. bool "Micrel/Kendin KS8695"
  496. select ARCH_REQUIRE_GPIOLIB
  497. select CLKSRC_MMIO
  498. select CPU_ARM922T
  499. select GENERIC_CLOCKEVENTS
  500. select NEED_MACH_MEMORY_H
  501. help
  502. Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
  503. System-on-Chip devices.
  504. config ARCH_W90X900
  505. bool "Nuvoton W90X900 CPU"
  506. select ARCH_REQUIRE_GPIOLIB
  507. select CLKDEV_LOOKUP
  508. select CLKSRC_MMIO
  509. select CPU_ARM926T
  510. select GENERIC_CLOCKEVENTS
  511. help
  512. Support for Nuvoton (Winbond logic dept.) ARM9 processor,
  513. At present, the w90x900 has been renamed nuc900, regarding
  514. the ARM series product line, you can login the following
  515. link address to know more.
  516. <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
  517. ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
  518. config ARCH_LPC32XX
  519. bool "NXP LPC32XX"
  520. select ARCH_REQUIRE_GPIOLIB
  521. select ARM_AMBA
  522. select CLKDEV_LOOKUP
  523. select CLKSRC_MMIO
  524. select CPU_ARM926T
  525. select GENERIC_CLOCKEVENTS
  526. select HAVE_IDE
  527. select HAVE_PWM
  528. select USB_ARCH_HAS_OHCI
  529. select USE_OF
  530. help
  531. Support for the NXP LPC32XX family of processors
  532. config ARCH_PXA
  533. bool "PXA2xx/PXA3xx-based"
  534. depends on MMU
  535. select ARCH_HAS_CPUFREQ
  536. select ARCH_MTD_XIP
  537. select ARCH_REQUIRE_GPIOLIB
  538. select ARM_CPU_SUSPEND if PM
  539. select AUTO_ZRELADDR
  540. select CLKDEV_LOOKUP
  541. select CLKSRC_MMIO
  542. select GENERIC_CLOCKEVENTS
  543. select GPIO_PXA
  544. select HAVE_IDE
  545. select MULTI_IRQ_HANDLER
  546. select NEED_MACH_GPIO_H
  547. select PLAT_PXA
  548. select SPARSE_IRQ
  549. help
  550. Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
  551. config ARCH_MSM
  552. bool "Qualcomm MSM"
  553. select ARCH_REQUIRE_GPIOLIB
  554. select CLKDEV_LOOKUP
  555. select CLKSRC_OF if OF
  556. select COMMON_CLK
  557. select GENERIC_CLOCKEVENTS
  558. help
  559. Support for Qualcomm MSM/QSD based systems. This runs on the
  560. apps processor of the MSM/QSD and depends on a shared memory
  561. interface to the modem processor which runs the baseband
  562. stack and controls some vital subsystems
  563. (clock and power control, etc).
  564. config ARCH_SHMOBILE
  565. bool "Renesas SH-Mobile / R-Mobile"
  566. select ARM_PATCH_PHYS_VIRT
  567. select CLKDEV_LOOKUP
  568. select GENERIC_CLOCKEVENTS
  569. select HAVE_ARM_SCU if SMP
  570. select HAVE_ARM_TWD if SMP
  571. select HAVE_CLK
  572. select HAVE_MACH_CLKDEV
  573. select HAVE_SMP
  574. select MIGHT_HAVE_CACHE_L2X0
  575. select MULTI_IRQ_HANDLER
  576. select NO_IOPORT
  577. select PINCTRL
  578. select PM_GENERIC_DOMAINS if PM
  579. select SPARSE_IRQ
  580. help
  581. Support for Renesas's SH-Mobile and R-Mobile ARM platforms.
  582. config ARCH_RPC
  583. bool "RiscPC"
  584. select ARCH_ACORN
  585. select ARCH_MAY_HAVE_PC_FDC
  586. select ARCH_SPARSEMEM_ENABLE
  587. select ARCH_USES_GETTIMEOFFSET
  588. select FIQ
  589. select HAVE_IDE
  590. select HAVE_PATA_PLATFORM
  591. select ISA_DMA_API
  592. select NEED_MACH_IO_H
  593. select NEED_MACH_MEMORY_H
  594. select NO_IOPORT
  595. select VIRT_TO_BUS
  596. help
  597. On the Acorn Risc-PC, Linux can support the internal IDE disk and
  598. CD-ROM interface, serial and parallel port, and the floppy drive.
  599. config ARCH_SA1100
  600. bool "SA1100-based"
  601. select ARCH_HAS_CPUFREQ
  602. select ARCH_MTD_XIP
  603. select ARCH_REQUIRE_GPIOLIB
  604. select ARCH_SPARSEMEM_ENABLE
  605. select CLKDEV_LOOKUP
  606. select CLKSRC_MMIO
  607. select CPU_FREQ
  608. select CPU_SA1100
  609. select GENERIC_CLOCKEVENTS
  610. select HAVE_IDE
  611. select ISA
  612. select NEED_MACH_GPIO_H
  613. select NEED_MACH_MEMORY_H
  614. select SPARSE_IRQ
  615. help
  616. Support for StrongARM 11x0 based boards.
  617. config ARCH_S3C24XX
  618. bool "Samsung S3C24XX SoCs"
  619. select ARCH_HAS_CPUFREQ
  620. select ARCH_REQUIRE_GPIOLIB
  621. select CLKDEV_LOOKUP
  622. select CLKSRC_MMIO
  623. select GENERIC_CLOCKEVENTS
  624. select GPIO_SAMSUNG
  625. select HAVE_CLK
  626. select HAVE_S3C2410_I2C if I2C
  627. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  628. select HAVE_S3C_RTC if RTC_CLASS
  629. select MULTI_IRQ_HANDLER
  630. select NEED_MACH_GPIO_H
  631. select NEED_MACH_IO_H
  632. select SAMSUNG_ATAGS
  633. help
  634. Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
  635. and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
  636. (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
  637. Samsung SMDK2410 development board (and derivatives).
  638. config ARCH_S3C64XX
  639. bool "Samsung S3C64XX"
  640. select ARCH_HAS_CPUFREQ
  641. select ARCH_REQUIRE_GPIOLIB
  642. select ARM_VIC
  643. select CLKDEV_LOOKUP
  644. select CLKSRC_MMIO
  645. select CPU_V6
  646. select GENERIC_CLOCKEVENTS
  647. select GPIO_SAMSUNG
  648. select HAVE_CLK
  649. select HAVE_S3C2410_I2C if I2C
  650. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  651. select HAVE_TCM
  652. select NEED_MACH_GPIO_H
  653. select NO_IOPORT
  654. select PLAT_SAMSUNG
  655. select S3C_DEV_NAND
  656. select S3C_GPIO_TRACK
  657. select SAMSUNG_ATAGS
  658. select SAMSUNG_CLKSRC
  659. select SAMSUNG_GPIOLIB_4BIT
  660. select SAMSUNG_IRQ_VIC_TIMER
  661. select SAMSUNG_WDT_RESET
  662. select USB_ARCH_HAS_OHCI
  663. help
  664. Samsung S3C64XX series based systems
  665. config ARCH_S5P64X0
  666. bool "Samsung S5P6440 S5P6450"
  667. select CLKDEV_LOOKUP
  668. select CLKSRC_MMIO
  669. select CPU_V6
  670. select GENERIC_CLOCKEVENTS
  671. select GPIO_SAMSUNG
  672. select HAVE_CLK
  673. select HAVE_S3C2410_I2C if I2C
  674. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  675. select HAVE_S3C_RTC if RTC_CLASS
  676. select NEED_MACH_GPIO_H
  677. select SAMSUNG_WDT_RESET
  678. select SAMSUNG_ATAGS
  679. help
  680. Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,
  681. SMDK6450.
  682. config ARCH_S5PC100
  683. bool "Samsung S5PC100"
  684. select ARCH_REQUIRE_GPIOLIB
  685. select CLKDEV_LOOKUP
  686. select CLKSRC_MMIO
  687. select CPU_V7
  688. select GENERIC_CLOCKEVENTS
  689. select GPIO_SAMSUNG
  690. select HAVE_CLK
  691. select HAVE_S3C2410_I2C if I2C
  692. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  693. select HAVE_S3C_RTC if RTC_CLASS
  694. select NEED_MACH_GPIO_H
  695. select SAMSUNG_WDT_RESET
  696. select SAMSUNG_ATAGS
  697. help
  698. Samsung S5PC100 series based systems
  699. config ARCH_S5PV210
  700. bool "Samsung S5PV210/S5PC110"
  701. select ARCH_HAS_CPUFREQ
  702. select ARCH_HAS_HOLES_MEMORYMODEL
  703. select ARCH_SPARSEMEM_ENABLE
  704. select CLKDEV_LOOKUP
  705. select CLKSRC_MMIO
  706. select CPU_V7
  707. select GENERIC_CLOCKEVENTS
  708. select GPIO_SAMSUNG
  709. select HAVE_CLK
  710. select HAVE_S3C2410_I2C if I2C
  711. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  712. select HAVE_S3C_RTC if RTC_CLASS
  713. select NEED_MACH_GPIO_H
  714. select NEED_MACH_MEMORY_H
  715. select SAMSUNG_ATAGS
  716. help
  717. Samsung S5PV210/S5PC110 series based systems
  718. config ARCH_EXYNOS
  719. bool "Samsung EXYNOS"
  720. select ARCH_HAS_CPUFREQ
  721. select ARCH_HAS_HOLES_MEMORYMODEL
  722. select ARCH_REQUIRE_GPIOLIB
  723. select ARCH_SPARSEMEM_ENABLE
  724. select ARM_GIC
  725. select CLKDEV_LOOKUP
  726. select COMMON_CLK
  727. select CPU_V7
  728. select GENERIC_CLOCKEVENTS
  729. select HAVE_CLK
  730. select HAVE_S3C2410_I2C if I2C
  731. select HAVE_S3C2410_WATCHDOG if WATCHDOG
  732. select HAVE_S3C_RTC if RTC_CLASS
  733. select NEED_MACH_MEMORY_H
  734. select SPARSE_IRQ
  735. select USE_OF
  736. help
  737. Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
  738. config ARCH_SHARK
  739. bool "Shark"
  740. select ARCH_USES_GETTIMEOFFSET
  741. select CPU_SA110
  742. select ISA
  743. select ISA_DMA
  744. select NEED_MACH_MEMORY_H
  745. select PCI
  746. select VIRT_TO_BUS
  747. select ZONE_DMA
  748. help
  749. Support for the StrongARM based Digital DNARD machine, also known
  750. as "Shark" (<http://www.shark-linux.de/shark.html>).
  751. config ARCH_DAVINCI
  752. bool "TI DaVinci"
  753. select ARCH_HAS_HOLES_MEMORYMODEL
  754. select ARCH_REQUIRE_GPIOLIB
  755. select CLKDEV_LOOKUP
  756. select GENERIC_ALLOCATOR
  757. select GENERIC_CLOCKEVENTS
  758. select GENERIC_IRQ_CHIP
  759. select HAVE_IDE
  760. select NEED_MACH_GPIO_H
  761. select TI_PRIV_EDMA
  762. select USE_OF
  763. select ZONE_DMA
  764. help
  765. Support for TI's DaVinci platform.
  766. config ARCH_OMAP1
  767. bool "TI OMAP1"
  768. depends on MMU
  769. select ARCH_HAS_CPUFREQ
  770. select ARCH_HAS_HOLES_MEMORYMODEL
  771. select ARCH_OMAP
  772. select ARCH_REQUIRE_GPIOLIB
  773. select CLKDEV_LOOKUP
  774. select CLKSRC_MMIO
  775. select GENERIC_CLOCKEVENTS
  776. select GENERIC_IRQ_CHIP
  777. select HAVE_CLK
  778. select HAVE_IDE
  779. select IRQ_DOMAIN
  780. select NEED_MACH_IO_H if PCCARD
  781. select NEED_MACH_MEMORY_H
  782. help
  783. Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
  784. endchoice
  785. menu "Multiple platform selection"
  786. depends on ARCH_MULTIPLATFORM
  787. comment "CPU Core family selection"
  788. config ARCH_MULTI_V4T
  789. bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
  790. depends on !ARCH_MULTI_V6_V7
  791. select ARCH_MULTI_V4_V5
  792. select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
  793. CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
  794. CPU_ARM925T || CPU_ARM940T)
  795. config ARCH_MULTI_V5
  796. bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
  797. depends on !ARCH_MULTI_V6_V7
  798. select ARCH_MULTI_V4_V5
  799. select CPU_ARM926T if (!CPU_ARM946E || CPU_ARM1020 || \
  800. CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
  801. CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
  802. config ARCH_MULTI_V4_V5
  803. bool
  804. config ARCH_MULTI_V6
  805. bool "ARMv6 based platforms (ARM11)"
  806. select ARCH_MULTI_V6_V7
  807. select CPU_V6
  808. config ARCH_MULTI_V7
  809. bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
  810. default y
  811. select ARCH_MULTI_V6_V7
  812. select CPU_V7
  813. config ARCH_MULTI_V6_V7
  814. bool
  815. config ARCH_MULTI_CPU_AUTO
  816. def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
  817. select ARCH_MULTI_V5
  818. endmenu
  819. #
  820. # This is sorted alphabetically by mach-* pathname. However, plat-*
  821. # Kconfigs may be included either alphabetically (according to the
  822. # plat- suffix) or along side the corresponding mach-* source.
  823. #
  824. source "arch/arm/mach-mvebu/Kconfig"
  825. source "arch/arm/mach-at91/Kconfig"
  826. source "arch/arm/mach-bcm/Kconfig"
  827. source "arch/arm/mach-bcm2835/Kconfig"
  828. source "arch/arm/mach-clps711x/Kconfig"
  829. source "arch/arm/mach-cns3xxx/Kconfig"
  830. source "arch/arm/mach-davinci/Kconfig"
  831. source "arch/arm/mach-dove/Kconfig"
  832. source "arch/arm/mach-ep93xx/Kconfig"
  833. source "arch/arm/mach-footbridge/Kconfig"
  834. source "arch/arm/mach-gemini/Kconfig"
  835. source "arch/arm/mach-highbank/Kconfig"
  836. source "arch/arm/mach-integrator/Kconfig"
  837. source "arch/arm/mach-iop32x/Kconfig"
  838. source "arch/arm/mach-iop33x/Kconfig"
  839. source "arch/arm/mach-iop13xx/Kconfig"
  840. source "arch/arm/mach-ixp4xx/Kconfig"
  841. source "arch/arm/mach-keystone/Kconfig"
  842. source "arch/arm/mach-kirkwood/Kconfig"
  843. source "arch/arm/mach-ks8695/Kconfig"
  844. source "arch/arm/mach-msm/Kconfig"
  845. source "arch/arm/mach-mv78xx0/Kconfig"
  846. source "arch/arm/mach-imx/Kconfig"
  847. source "arch/arm/mach-mxs/Kconfig"
  848. source "arch/arm/mach-netx/Kconfig"
  849. source "arch/arm/mach-nomadik/Kconfig"
  850. source "arch/arm/mach-nspire/Kconfig"
  851. source "arch/arm/plat-omap/Kconfig"
  852. source "arch/arm/mach-omap1/Kconfig"
  853. source "arch/arm/mach-omap2/Kconfig"
  854. source "arch/arm/mach-orion5x/Kconfig"
  855. source "arch/arm/mach-picoxcell/Kconfig"
  856. source "arch/arm/mach-pxa/Kconfig"
  857. source "arch/arm/plat-pxa/Kconfig"
  858. source "arch/arm/mach-mmp/Kconfig"
  859. source "arch/arm/mach-realview/Kconfig"
  860. source "arch/arm/mach-rockchip/Kconfig"
  861. source "arch/arm/mach-sa1100/Kconfig"
  862. source "arch/arm/plat-samsung/Kconfig"
  863. source "arch/arm/mach-socfpga/Kconfig"
  864. source "arch/arm/mach-spear/Kconfig"
  865. source "arch/arm/mach-sti/Kconfig"
  866. source "arch/arm/mach-s3c24xx/Kconfig"
  867. if ARCH_S3C64XX
  868. source "arch/arm/mach-s3c64xx/Kconfig"
  869. endif
  870. source "arch/arm/mach-s5p64x0/Kconfig"
  871. source "arch/arm/mach-s5pc100/Kconfig"
  872. source "arch/arm/mach-s5pv210/Kconfig"
  873. source "arch/arm/mach-exynos/Kconfig"
  874. source "arch/arm/mach-shmobile/Kconfig"
  875. source "arch/arm/mach-sunxi/Kconfig"
  876. source "arch/arm/mach-prima2/Kconfig"
  877. source "arch/arm/mach-tegra/Kconfig"
  878. source "arch/arm/mach-u300/Kconfig"
  879. source "arch/arm/mach-ux500/Kconfig"
  880. source "arch/arm/mach-versatile/Kconfig"
  881. source "arch/arm/mach-vexpress/Kconfig"
  882. source "arch/arm/plat-versatile/Kconfig"
  883. source "arch/arm/mach-virt/Kconfig"
  884. source "arch/arm/mach-vt8500/Kconfig"
  885. source "arch/arm/mach-w90x900/Kconfig"
  886. source "arch/arm/mach-zynq/Kconfig"
  887. # Definitions to make life easier
  888. config ARCH_ACORN
  889. bool
  890. config PLAT_IOP
  891. bool
  892. select GENERIC_CLOCKEVENTS
  893. config PLAT_ORION
  894. bool
  895. select CLKSRC_MMIO
  896. select COMMON_CLK
  897. select GENERIC_IRQ_CHIP
  898. select IRQ_DOMAIN
  899. config PLAT_ORION_LEGACY
  900. bool
  901. select PLAT_ORION
  902. config PLAT_PXA
  903. bool
  904. config PLAT_VERSATILE
  905. bool
  906. config ARM_TIMER_SP804
  907. bool
  908. select CLKSRC_MMIO
  909. select CLKSRC_OF if OF
  910. source arch/arm/mm/Kconfig
  911. config ARM_NR_BANKS
  912. int
  913. default 16 if ARCH_EP93XX
  914. default 8
  915. config IWMMXT
  916. bool "Enable iWMMXt support" if !CPU_PJ4
  917. depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4
  918. default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4
  919. help
  920. Enable support for iWMMXt context switching at run time if
  921. running on a CPU that supports it.
  922. config XSCALE_PMU
  923. bool
  924. depends on CPU_XSCALE
  925. default y
  926. config MULTI_IRQ_HANDLER
  927. bool
  928. help
  929. Allow each machine to specify it's own IRQ handler at run time.
  930. if !MMU
  931. source "arch/arm/Kconfig-nommu"
  932. endif
  933. config PJ4B_ERRATA_4742
  934. bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
  935. depends on CPU_PJ4B && MACH_ARMADA_370
  936. default y
  937. help
  938. When coming out of either a Wait for Interrupt (WFI) or a Wait for
  939. Event (WFE) IDLE states, a specific timing sensitivity exists between
  940. the retiring WFI/WFE instructions and the newly issued subsequent
  941. instructions. This sensitivity can result in a CPU hang scenario.
  942. Workaround:
  943. The software must insert either a Data Synchronization Barrier (DSB)
  944. or Data Memory Barrier (DMB) command immediately after the WFI/WFE
  945. instruction
  946. config ARM_ERRATA_326103
  947. bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
  948. depends on CPU_V6
  949. help
  950. Executing a SWP instruction to read-only memory does not set bit 11
  951. of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
  952. treat the access as a read, preventing a COW from occurring and
  953. causing the faulting task to livelock.
  954. config ARM_ERRATA_411920
  955. bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
  956. depends on CPU_V6 || CPU_V6K
  957. help
  958. Invalidation of the Instruction Cache operation can
  959. fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
  960. It does not affect the MPCore. This option enables the ARM Ltd.
  961. recommended workaround.
  962. config ARM_ERRATA_430973
  963. bool "ARM errata: Stale prediction on replaced interworking branch"
  964. depends on CPU_V7
  965. help
  966. This option enables the workaround for the 430973 Cortex-A8
  967. (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
  968. interworking branch is replaced with another code sequence at the
  969. same virtual address, whether due to self-modifying code or virtual
  970. to physical address re-mapping, Cortex-A8 does not recover from the
  971. stale interworking branch prediction. This results in Cortex-A8
  972. executing the new code sequence in the incorrect ARM or Thumb state.
  973. The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
  974. and also flushes the branch target cache at every context switch.
  975. Note that setting specific bits in the ACTLR register may not be
  976. available in non-secure mode.
  977. config ARM_ERRATA_458693
  978. bool "ARM errata: Processor deadlock when a false hazard is created"
  979. depends on CPU_V7
  980. depends on !ARCH_MULTIPLATFORM
  981. help
  982. This option enables the workaround for the 458693 Cortex-A8 (r2p0)
  983. erratum. For very specific sequences of memory operations, it is
  984. possible for a hazard condition intended for a cache line to instead
  985. be incorrectly associated with a different cache line. This false
  986. hazard might then cause a processor deadlock. The workaround enables
  987. the L1 caching of the NEON accesses and disables the PLD instruction
  988. in the ACTLR register. Note that setting specific bits in the ACTLR
  989. register may not be available in non-secure mode.
  990. config ARM_ERRATA_460075
  991. bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
  992. depends on CPU_V7
  993. depends on !ARCH_MULTIPLATFORM
  994. help
  995. This option enables the workaround for the 460075 Cortex-A8 (r2p0)
  996. erratum. Any asynchronous access to the L2 cache may encounter a
  997. situation in which recent store transactions to the L2 cache are lost
  998. and overwritten with stale memory contents from external memory. The
  999. workaround disables the write-allocate mode for the L2 cache via the
  1000. ACTLR register. Note that setting specific bits in the ACTLR register
  1001. may not be available in non-secure mode.
  1002. config ARM_ERRATA_742230
  1003. bool "ARM errata: DMB operation may be faulty"
  1004. depends on CPU_V7 && SMP
  1005. depends on !ARCH_MULTIPLATFORM
  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. depends on !ARCH_MULTIPLATFORM
  1018. help
  1019. This option enables the workaround for the 742231 Cortex-A9
  1020. (r2p0..r2p2) erratum. Under certain conditions, specific to the
  1021. Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
  1022. accessing some data located in the same cache line, may get corrupted
  1023. data due to bad handling of the address hazard when the line gets
  1024. replaced from one of the CPUs at the same time as another CPU is
  1025. accessing it. This workaround sets specific bits in the diagnostic
  1026. register of the Cortex-A9 which reduces the linefill issuing
  1027. capabilities of the processor.
  1028. config PL310_ERRATA_588369
  1029. bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
  1030. depends on CACHE_L2X0
  1031. help
  1032. The PL310 L2 cache controller implements three types of Clean &
  1033. Invalidate maintenance operations: by Physical Address
  1034. (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
  1035. They are architecturally defined to behave as the execution of a
  1036. clean operation followed immediately by an invalidate operation,
  1037. both performing to the same memory location. This functionality
  1038. is not correctly implemented in PL310 as clean lines are not
  1039. invalidated as a result of these operations.
  1040. config ARM_ERRATA_643719
  1041. bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
  1042. depends on CPU_V7 && SMP
  1043. help
  1044. This option enables the workaround for the 643719 Cortex-A9 (prior to
  1045. r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
  1046. register returns zero when it should return one. The workaround
  1047. corrects this value, ensuring cache maintenance operations which use
  1048. it behave as intended and avoiding data corruption.
  1049. config ARM_ERRATA_720789
  1050. bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
  1051. depends on CPU_V7
  1052. help
  1053. This option enables the workaround for the 720789 Cortex-A9 (prior to
  1054. r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
  1055. broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
  1056. As a consequence of this erratum, some TLB entries which should be
  1057. invalidated are not, resulting in an incoherency in the system page
  1058. tables. The workaround changes the TLB flushing routines to invalidate
  1059. entries regardless of the ASID.
  1060. config PL310_ERRATA_727915
  1061. bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
  1062. depends on CACHE_L2X0
  1063. help
  1064. PL310 implements the Clean & Invalidate by Way L2 cache maintenance
  1065. operation (offset 0x7FC). This operation runs in background so that
  1066. PL310 can handle normal accesses while it is in progress. Under very
  1067. rare circumstances, due to this erratum, write data can be lost when
  1068. PL310 treats a cacheable write transaction during a Clean &
  1069. Invalidate by Way operation.
  1070. config ARM_ERRATA_743622
  1071. bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
  1072. depends on CPU_V7
  1073. depends on !ARCH_MULTIPLATFORM
  1074. help
  1075. This option enables the workaround for the 743622 Cortex-A9
  1076. (r2p*) erratum. Under very rare conditions, a faulty
  1077. optimisation in the Cortex-A9 Store Buffer may lead to data
  1078. corruption. This workaround sets a specific bit in the diagnostic
  1079. register of the Cortex-A9 which disables the Store Buffer
  1080. optimisation, preventing the defect from occurring. This has no
  1081. visible impact on the overall performance or power consumption of the
  1082. processor.
  1083. config ARM_ERRATA_751472
  1084. bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
  1085. depends on CPU_V7
  1086. depends on !ARCH_MULTIPLATFORM
  1087. help
  1088. This option enables the workaround for the 751472 Cortex-A9 (prior
  1089. to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
  1090. completion of a following broadcasted operation if the second
  1091. operation is received by a CPU before the ICIALLUIS has completed,
  1092. potentially leading to corrupted entries in the cache or TLB.
  1093. config PL310_ERRATA_753970
  1094. bool "PL310 errata: cache sync operation may be faulty"
  1095. depends on CACHE_PL310
  1096. help
  1097. This option enables the workaround for the 753970 PL310 (r3p0) erratum.
  1098. Under some condition the effect of cache sync operation on
  1099. the store buffer still remains when the operation completes.
  1100. This means that the store buffer is always asked to drain and
  1101. this prevents it from merging any further writes. The workaround
  1102. is to replace the normal offset of cache sync operation (0x730)
  1103. by another offset targeting an unmapped PL310 register 0x740.
  1104. This has the same effect as the cache sync operation: store buffer
  1105. drain and waiting for all buffers empty.
  1106. config ARM_ERRATA_754322
  1107. bool "ARM errata: possible faulty MMU translations following an ASID switch"
  1108. depends on CPU_V7
  1109. help
  1110. This option enables the workaround for the 754322 Cortex-A9 (r2p*,
  1111. r3p*) erratum. A speculative memory access may cause a page table walk
  1112. which starts prior to an ASID switch but completes afterwards. This
  1113. can populate the micro-TLB with a stale entry which may be hit with
  1114. the new ASID. This workaround places two dsb instructions in the mm
  1115. switching code so that no page table walks can cross the ASID switch.
  1116. config ARM_ERRATA_754327
  1117. bool "ARM errata: no automatic Store Buffer drain"
  1118. depends on CPU_V7 && SMP
  1119. help
  1120. This option enables the workaround for the 754327 Cortex-A9 (prior to
  1121. r2p0) erratum. The Store Buffer does not have any automatic draining
  1122. mechanism and therefore a livelock may occur if an external agent
  1123. continuously polls a memory location waiting to observe an update.
  1124. This workaround defines cpu_relax() as smp_mb(), preventing correctly
  1125. written polling loops from denying visibility of updates to memory.
  1126. config ARM_ERRATA_364296
  1127. bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
  1128. depends on CPU_V6
  1129. help
  1130. This options enables the workaround for the 364296 ARM1136
  1131. r0p2 erratum (possible cache data corruption with
  1132. hit-under-miss enabled). It sets the undocumented bit 31 in
  1133. the auxiliary control register and the FI bit in the control
  1134. register, thus disabling hit-under-miss without putting the
  1135. processor into full low interrupt latency mode. ARM11MPCore
  1136. is not affected.
  1137. config ARM_ERRATA_764369
  1138. bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
  1139. depends on CPU_V7 && SMP
  1140. help
  1141. This option enables the workaround for erratum 764369
  1142. affecting Cortex-A9 MPCore with two or more processors (all
  1143. current revisions). Under certain timing circumstances, a data
  1144. cache line maintenance operation by MVA targeting an Inner
  1145. Shareable memory region may fail to proceed up to either the
  1146. Point of Coherency or to the Point of Unification of the
  1147. system. This workaround adds a DSB instruction before the
  1148. relevant cache maintenance functions and sets a specific bit
  1149. in the diagnostic control register of the SCU.
  1150. config PL310_ERRATA_769419
  1151. bool "PL310 errata: no automatic Store Buffer drain"
  1152. depends on CACHE_L2X0
  1153. help
  1154. On revisions of the PL310 prior to r3p2, the Store Buffer does
  1155. not automatically drain. This can cause normal, non-cacheable
  1156. writes to be retained when the memory system is idle, leading
  1157. to suboptimal I/O performance for drivers using coherent DMA.
  1158. This option adds a write barrier to the cpu_idle loop so that,
  1159. on systems with an outer cache, the store buffer is drained
  1160. explicitly.
  1161. config ARM_ERRATA_775420
  1162. bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
  1163. depends on CPU_V7
  1164. help
  1165. This option enables the workaround for the 775420 Cortex-A9 (r2p2,
  1166. r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
  1167. operation aborts with MMU exception, it might cause the processor
  1168. to deadlock. This workaround puts DSB before executing ISB if
  1169. an abort may occur on cache maintenance.
  1170. config ARM_ERRATA_798181
  1171. bool "ARM errata: TLBI/DSB failure on Cortex-A15"
  1172. depends on CPU_V7 && SMP
  1173. help
  1174. On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
  1175. adequately shooting down all use of the old entries. This
  1176. option enables the Linux kernel workaround for this erratum
  1177. which sends an IPI to the CPUs that are running the same ASID
  1178. as the one being invalidated.
  1179. endmenu
  1180. source "arch/arm/common/Kconfig"
  1181. menu "Bus support"
  1182. config ARM_AMBA
  1183. bool
  1184. config ISA
  1185. bool
  1186. help
  1187. Find out whether you have ISA slots on your motherboard. ISA is the
  1188. name of a bus system, i.e. the way the CPU talks to the other stuff
  1189. inside your box. Other bus systems are PCI, EISA, MicroChannel
  1190. (MCA) or VESA. ISA is an older system, now being displaced by PCI;
  1191. newer boards don't support it. If you have ISA, say Y, otherwise N.
  1192. # Select ISA DMA controller support
  1193. config ISA_DMA
  1194. bool
  1195. select ISA_DMA_API
  1196. # Select ISA DMA interface
  1197. config ISA_DMA_API
  1198. bool
  1199. config PCI
  1200. bool "PCI support" if MIGHT_HAVE_PCI
  1201. help
  1202. Find out whether you have a PCI motherboard. PCI is the name of a
  1203. bus system, i.e. the way the CPU talks to the other stuff inside
  1204. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  1205. VESA. If you have PCI, say Y, otherwise N.
  1206. config PCI_DOMAINS
  1207. bool
  1208. depends on PCI
  1209. config PCI_NANOENGINE
  1210. bool "BSE nanoEngine PCI support"
  1211. depends on SA1100_NANOENGINE
  1212. help
  1213. Enable PCI on the BSE nanoEngine board.
  1214. config PCI_SYSCALL
  1215. def_bool PCI
  1216. # Select the host bridge type
  1217. config PCI_HOST_VIA82C505
  1218. bool
  1219. depends on PCI && ARCH_SHARK
  1220. default y
  1221. config PCI_HOST_ITE8152
  1222. bool
  1223. depends on PCI && MACH_ARMCORE
  1224. default y
  1225. select DMABOUNCE
  1226. source "drivers/pci/Kconfig"
  1227. source "drivers/pci/pcie/Kconfig"
  1228. source "drivers/pcmcia/Kconfig"
  1229. endmenu
  1230. menu "Kernel Features"
  1231. config HAVE_SMP
  1232. bool
  1233. help
  1234. This option should be selected by machines which have an SMP-
  1235. capable CPU.
  1236. The only effect of this option is to make the SMP-related
  1237. options available to the user for configuration.
  1238. config SMP
  1239. bool "Symmetric Multi-Processing"
  1240. depends on CPU_V6K || CPU_V7
  1241. depends on GENERIC_CLOCKEVENTS
  1242. depends on HAVE_SMP
  1243. depends on MMU || ARM_MPU
  1244. select USE_GENERIC_SMP_HELPERS
  1245. help
  1246. This enables support for systems with more than one CPU. If you have
  1247. a system with only one CPU, like most personal computers, say N. If
  1248. you have a system with more than one CPU, say Y.
  1249. If you say N here, the kernel will run on single and multiprocessor
  1250. machines, but will use only one CPU of a multiprocessor machine. If
  1251. you say Y here, the kernel will run on many, but not all, single
  1252. processor machines. On a single processor machine, the kernel will
  1253. run faster if you say N here.
  1254. See also <file:Documentation/x86/i386/IO-APIC.txt>,
  1255. <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
  1256. <http://tldp.org/HOWTO/SMP-HOWTO.html>.
  1257. If you don't know what to do here, say N.
  1258. config SMP_ON_UP
  1259. bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
  1260. depends on SMP && !XIP_KERNEL && MMU
  1261. default y
  1262. help
  1263. SMP kernels contain instructions which fail on non-SMP processors.
  1264. Enabling this option allows the kernel to modify itself to make
  1265. these instructions safe. Disabling it allows about 1K of space
  1266. savings.
  1267. If you don't know what to do here, say Y.
  1268. config ARM_CPU_TOPOLOGY
  1269. bool "Support cpu topology definition"
  1270. depends on SMP && CPU_V7
  1271. default y
  1272. help
  1273. Support ARM cpu topology definition. The MPIDR register defines
  1274. affinity between processors which is then used to describe the cpu
  1275. topology of an ARM System.
  1276. config SCHED_MC
  1277. bool "Multi-core scheduler support"
  1278. depends on ARM_CPU_TOPOLOGY
  1279. help
  1280. Multi-core scheduler support improves the CPU scheduler's decision
  1281. making when dealing with multi-core CPU chips at a cost of slightly
  1282. increased overhead in some places. If unsure say N here.
  1283. config SCHED_SMT
  1284. bool "SMT scheduler support"
  1285. depends on ARM_CPU_TOPOLOGY
  1286. help
  1287. Improves the CPU scheduler's decision making when dealing with
  1288. MultiThreading at a cost of slightly increased overhead in some
  1289. places. If unsure say N here.
  1290. config HAVE_ARM_SCU
  1291. bool
  1292. help
  1293. This option enables support for the ARM system coherency unit
  1294. config HAVE_ARM_ARCH_TIMER
  1295. bool "Architected timer support"
  1296. depends on CPU_V7
  1297. select ARM_ARCH_TIMER
  1298. help
  1299. This option enables support for the ARM architected timer
  1300. config HAVE_ARM_TWD
  1301. bool
  1302. depends on SMP
  1303. select CLKSRC_OF if OF
  1304. help
  1305. This options enables support for the ARM timer and watchdog unit
  1306. config MCPM
  1307. bool "Multi-Cluster Power Management"
  1308. depends on CPU_V7 && SMP
  1309. help
  1310. This option provides the common power management infrastructure
  1311. for (multi-)cluster based systems, such as big.LITTLE based
  1312. systems.
  1313. choice
  1314. prompt "Memory split"
  1315. default VMSPLIT_3G
  1316. help
  1317. Select the desired split between kernel and user memory.
  1318. If you are not absolutely sure what you are doing, leave this
  1319. option alone!
  1320. config VMSPLIT_3G
  1321. bool "3G/1G user/kernel split"
  1322. config VMSPLIT_2G
  1323. bool "2G/2G user/kernel split"
  1324. config VMSPLIT_1G
  1325. bool "1G/3G user/kernel split"
  1326. endchoice
  1327. config PAGE_OFFSET
  1328. hex
  1329. default 0x40000000 if VMSPLIT_1G
  1330. default 0x80000000 if VMSPLIT_2G
  1331. default 0xC0000000
  1332. config NR_CPUS
  1333. int "Maximum number of CPUs (2-32)"
  1334. range 2 32
  1335. depends on SMP
  1336. default "4"
  1337. config HOTPLUG_CPU
  1338. bool "Support for hot-pluggable CPUs"
  1339. depends on SMP
  1340. help
  1341. Say Y here to experiment with turning CPUs off and on. CPUs
  1342. can be controlled through /sys/devices/system/cpu.
  1343. config ARM_PSCI
  1344. bool "Support for the ARM Power State Coordination Interface (PSCI)"
  1345. depends on CPU_V7
  1346. help
  1347. Say Y here if you want Linux to communicate with system firmware
  1348. implementing the PSCI specification for CPU-centric power
  1349. management operations described in ARM document number ARM DEN
  1350. 0022A ("Power State Coordination Interface System Software on
  1351. ARM processors").
  1352. # The GPIO number here must be sorted by descending number. In case of
  1353. # a multiplatform kernel, we just want the highest value required by the
  1354. # selected platforms.
  1355. config ARCH_NR_GPIO
  1356. int
  1357. default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
  1358. default 512 if SOC_OMAP5
  1359. default 512 if ARCH_KEYSTONE
  1360. default 392 if ARCH_U8500
  1361. default 352 if ARCH_VT8500
  1362. default 288 if ARCH_SUNXI
  1363. default 264 if MACH_H4700
  1364. default 0
  1365. help
  1366. Maximum number of GPIOs in the system.
  1367. If unsure, leave the default value.
  1368. source kernel/Kconfig.preempt
  1369. config HZ
  1370. int
  1371. default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
  1372. ARCH_S5PV210 || ARCH_EXYNOS4
  1373. default AT91_TIMER_HZ if ARCH_AT91
  1374. default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
  1375. default 100
  1376. config SCHED_HRTICK
  1377. def_bool HIGH_RES_TIMERS
  1378. config THUMB2_KERNEL
  1379. bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
  1380. depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
  1381. default y if CPU_THUMBONLY
  1382. select AEABI
  1383. select ARM_ASM_UNIFIED
  1384. select ARM_UNWIND
  1385. help
  1386. By enabling this option, the kernel will be compiled in
  1387. Thumb-2 mode. A compiler/assembler that understand the unified
  1388. ARM-Thumb syntax is needed.
  1389. If unsure, say N.
  1390. config THUMB2_AVOID_R_ARM_THM_JUMP11
  1391. bool "Work around buggy Thumb-2 short branch relocations in gas"
  1392. depends on THUMB2_KERNEL && MODULES
  1393. default y
  1394. help
  1395. Various binutils versions can resolve Thumb-2 branches to
  1396. locally-defined, preemptible global symbols as short-range "b.n"
  1397. branch instructions.
  1398. This is a problem, because there's no guarantee the final
  1399. destination of the symbol, or any candidate locations for a
  1400. trampoline, are within range of the branch. For this reason, the
  1401. kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
  1402. relocation in modules at all, and it makes little sense to add
  1403. support.
  1404. The symptom is that the kernel fails with an "unsupported
  1405. relocation" error when loading some modules.
  1406. Until fixed tools are available, passing
  1407. -fno-optimize-sibling-calls to gcc should prevent gcc generating
  1408. code which hits this problem, at the cost of a bit of extra runtime
  1409. stack usage in some cases.
  1410. The problem is described in more detail at:
  1411. https://bugs.launchpad.net/binutils-linaro/+bug/725126
  1412. Only Thumb-2 kernels are affected.
  1413. Unless you are sure your tools don't have this problem, say Y.
  1414. config ARM_ASM_UNIFIED
  1415. bool
  1416. config AEABI
  1417. bool "Use the ARM EABI to compile the kernel"
  1418. help
  1419. This option allows for the kernel to be compiled using the latest
  1420. ARM ABI (aka EABI). This is only useful if you are using a user
  1421. space environment that is also compiled with EABI.
  1422. Since there are major incompatibilities between the legacy ABI and
  1423. EABI, especially with regard to structure member alignment, this
  1424. option also changes the kernel syscall calling convention to
  1425. disambiguate both ABIs and allow for backward compatibility support
  1426. (selected with CONFIG_OABI_COMPAT).
  1427. To use this you need GCC version 4.0.0 or later.
  1428. config OABI_COMPAT
  1429. bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
  1430. depends on AEABI && !THUMB2_KERNEL
  1431. default y
  1432. help
  1433. This option preserves the old syscall interface along with the
  1434. new (ARM EABI) one. It also provides a compatibility layer to
  1435. intercept syscalls that have structure arguments which layout
  1436. in memory differs between the legacy ABI and the new ARM EABI
  1437. (only for non "thumb" binaries). This option adds a tiny
  1438. overhead to all syscalls and produces a slightly larger kernel.
  1439. If you know you'll be using only pure EABI user space then you
  1440. can say N here. If this option is not selected and you attempt
  1441. to execute a legacy ABI binary then the result will be
  1442. UNPREDICTABLE (in fact it can be predicted that it won't work
  1443. at all). If in doubt say Y.
  1444. config ARCH_HAS_HOLES_MEMORYMODEL
  1445. bool
  1446. config ARCH_SPARSEMEM_ENABLE
  1447. bool
  1448. config ARCH_SPARSEMEM_DEFAULT
  1449. def_bool ARCH_SPARSEMEM_ENABLE
  1450. config ARCH_SELECT_MEMORY_MODEL
  1451. def_bool ARCH_SPARSEMEM_ENABLE
  1452. config HAVE_ARCH_PFN_VALID
  1453. def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
  1454. config HIGHMEM
  1455. bool "High Memory Support"
  1456. depends on MMU
  1457. help
  1458. The address space of ARM processors is only 4 Gigabytes large
  1459. and it has to accommodate user address space, kernel address
  1460. space as well as some memory mapped IO. That means that, if you
  1461. have a large amount of physical memory and/or IO, not all of the
  1462. memory can be "permanently mapped" by the kernel. The physical
  1463. memory that is not permanently mapped is called "high memory".
  1464. Depending on the selected kernel/user memory split, minimum
  1465. vmalloc space and actual amount of RAM, you may not need this
  1466. option which should result in a slightly faster kernel.
  1467. If unsure, say n.
  1468. config HIGHPTE
  1469. bool "Allocate 2nd-level pagetables from highmem"
  1470. depends on HIGHMEM
  1471. config HW_PERF_EVENTS
  1472. bool "Enable hardware performance counter support for perf events"
  1473. depends on PERF_EVENTS
  1474. default y
  1475. help
  1476. Enable hardware performance counter support for perf events. If
  1477. disabled, perf events will use software events only.
  1478. config SYS_SUPPORTS_HUGETLBFS
  1479. def_bool y
  1480. depends on ARM_LPAE
  1481. config HAVE_ARCH_TRANSPARENT_HUGEPAGE
  1482. def_bool y
  1483. depends on ARM_LPAE
  1484. source "mm/Kconfig"
  1485. config FORCE_MAX_ZONEORDER
  1486. int "Maximum zone order" if ARCH_SHMOBILE
  1487. range 11 64 if ARCH_SHMOBILE
  1488. default "12" if SOC_AM33XX
  1489. default "9" if SA1111
  1490. default "11"
  1491. help
  1492. The kernel memory allocator divides physically contiguous memory
  1493. blocks into "zones", where each zone is a power of two number of
  1494. pages. This option selects the largest power of two that the kernel
  1495. keeps in the memory allocator. If you need to allocate very large
  1496. blocks of physically contiguous memory, then you may need to
  1497. increase this value.
  1498. This config option is actually maximum order plus one. For example,
  1499. a value of 11 means that the largest free memory block is 2^10 pages.
  1500. config ALIGNMENT_TRAP
  1501. bool
  1502. depends on CPU_CP15_MMU
  1503. default y if !ARCH_EBSA110
  1504. select HAVE_PROC_CPU if PROC_FS
  1505. help
  1506. ARM processors cannot fetch/store information which is not
  1507. naturally aligned on the bus, i.e., a 4 byte fetch must start at an
  1508. address divisible by 4. On 32-bit ARM processors, these non-aligned
  1509. fetch/store instructions will be emulated in software if you say
  1510. here, which has a severe performance impact. This is necessary for
  1511. correct operation of some network protocols. With an IP-only
  1512. configuration it is safe to say N, otherwise say Y.
  1513. config UACCESS_WITH_MEMCPY
  1514. bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
  1515. depends on MMU
  1516. default y if CPU_FEROCEON
  1517. help
  1518. Implement faster copy_to_user and clear_user methods for CPU
  1519. cores where a 8-word STM instruction give significantly higher
  1520. memory write throughput than a sequence of individual 32bit stores.
  1521. A possible side effect is a slight increase in scheduling latency
  1522. between threads sharing the same address space if they invoke
  1523. such copy operations with large buffers.
  1524. However, if the CPU data cache is using a write-allocate mode,
  1525. this option is unlikely to provide any performance gain.
  1526. config SECCOMP
  1527. bool
  1528. prompt "Enable seccomp to safely compute untrusted bytecode"
  1529. ---help---
  1530. This kernel feature is useful for number crunching applications
  1531. that may need to compute untrusted bytecode during their
  1532. execution. By using pipes or other transports made available to
  1533. the process as file descriptors supporting the read/write
  1534. syscalls, it's possible to isolate those applications in
  1535. their own address space using seccomp. Once seccomp is
  1536. enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
  1537. and the task is only allowed to execute a few safe syscalls
  1538. defined by each seccomp mode.
  1539. config CC_STACKPROTECTOR
  1540. bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
  1541. help
  1542. This option turns on the -fstack-protector GCC feature. This
  1543. feature puts, at the beginning of functions, a canary value on
  1544. the stack just before the return address, and validates
  1545. the value just before actually returning. Stack based buffer
  1546. overflows (that need to overwrite this return address) now also
  1547. overwrite the canary, which gets detected and the attack is then
  1548. neutralized via a kernel panic.
  1549. This feature requires gcc version 4.2 or above.
  1550. config XEN_DOM0
  1551. def_bool y
  1552. depends on XEN
  1553. config XEN
  1554. bool "Xen guest support on ARM (EXPERIMENTAL)"
  1555. depends on ARM && AEABI && OF
  1556. depends on CPU_V7 && !CPU_V6
  1557. depends on !GENERIC_ATOMIC64
  1558. select ARM_PSCI
  1559. help
  1560. Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
  1561. endmenu
  1562. menu "Boot options"
  1563. config USE_OF
  1564. bool "Flattened Device Tree support"
  1565. select IRQ_DOMAIN
  1566. select OF
  1567. select OF_EARLY_FLATTREE
  1568. help
  1569. Include support for flattened device tree machine descriptions.
  1570. config ATAGS
  1571. bool "Support for the traditional ATAGS boot data passing" if USE_OF
  1572. default y
  1573. help
  1574. This is the traditional way of passing data to the kernel at boot
  1575. time. If you are solely relying on the flattened device tree (or
  1576. the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
  1577. to remove ATAGS support from your kernel binary. If unsure,
  1578. leave this to y.
  1579. config DEPRECATED_PARAM_STRUCT
  1580. bool "Provide old way to pass kernel parameters"
  1581. depends on ATAGS
  1582. help
  1583. This was deprecated in 2001 and announced to live on for 5 years.
  1584. Some old boot loaders still use this way.
  1585. # Compressed boot loader in ROM. Yes, we really want to ask about
  1586. # TEXT and BSS so we preserve their values in the config files.
  1587. config ZBOOT_ROM_TEXT
  1588. hex "Compressed ROM boot loader base address"
  1589. default "0"
  1590. help
  1591. The physical address at which the ROM-able zImage is to be
  1592. placed in the target. Platforms which normally make use of
  1593. ROM-able zImage formats normally set this to a suitable
  1594. value in their defconfig file.
  1595. If ZBOOT_ROM is not enabled, this has no effect.
  1596. config ZBOOT_ROM_BSS
  1597. hex "Compressed ROM boot loader BSS address"
  1598. default "0"
  1599. help
  1600. The base address of an area of read/write memory in the target
  1601. for the ROM-able zImage which must be available while the
  1602. decompressor is running. It must be large enough to hold the
  1603. entire decompressed kernel plus an additional 128 KiB.
  1604. Platforms which normally make use of ROM-able zImage formats
  1605. normally set this to a suitable value in their defconfig file.
  1606. If ZBOOT_ROM is not enabled, this has no effect.
  1607. config ZBOOT_ROM
  1608. bool "Compressed boot loader in ROM/flash"
  1609. depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
  1610. help
  1611. Say Y here if you intend to execute your compressed kernel image
  1612. (zImage) directly from ROM or flash. If unsure, say N.
  1613. choice
  1614. prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
  1615. depends on ZBOOT_ROM && ARCH_SH7372
  1616. default ZBOOT_ROM_NONE
  1617. help
  1618. Include experimental SD/MMC loading code in the ROM-able zImage.
  1619. With this enabled it is possible to write the ROM-able zImage
  1620. kernel image to an MMC or SD card and boot the kernel straight
  1621. from the reset vector. At reset the processor Mask ROM will load
  1622. the first part of the ROM-able zImage which in turn loads the
  1623. rest the kernel image to RAM.
  1624. config ZBOOT_ROM_NONE
  1625. bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
  1626. help
  1627. Do not load image from SD or MMC
  1628. config ZBOOT_ROM_MMCIF
  1629. bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
  1630. help
  1631. Load image from MMCIF hardware block.
  1632. config ZBOOT_ROM_SH_MOBILE_SDHI
  1633. bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
  1634. help
  1635. Load image from SDHI hardware block
  1636. endchoice
  1637. config ARM_APPENDED_DTB
  1638. bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
  1639. depends on OF && !ZBOOT_ROM
  1640. help
  1641. With this option, the boot code will look for a device tree binary
  1642. (DTB) appended to zImage
  1643. (e.g. cat zImage <filename>.dtb > zImage_w_dtb).
  1644. This is meant as a backward compatibility convenience for those
  1645. systems with a bootloader that can't be upgraded to accommodate
  1646. the documented boot protocol using a device tree.
  1647. Beware that there is very little in terms of protection against
  1648. this option being confused by leftover garbage in memory that might
  1649. look like a DTB header after a reboot if no actual DTB is appended
  1650. to zImage. Do not leave this option active in a production kernel
  1651. if you don't intend to always append a DTB. Proper passing of the
  1652. location into r2 of a bootloader provided DTB is always preferable
  1653. to this option.
  1654. config ARM_ATAG_DTB_COMPAT
  1655. bool "Supplement the appended DTB with traditional ATAG information"
  1656. depends on ARM_APPENDED_DTB
  1657. help
  1658. Some old bootloaders can't be updated to a DTB capable one, yet
  1659. they provide ATAGs with memory configuration, the ramdisk address,
  1660. the kernel cmdline string, etc. Such information is dynamically
  1661. provided by the bootloader and can't always be stored in a static
  1662. DTB. To allow a device tree enabled kernel to be used with such
  1663. bootloaders, this option allows zImage to extract the information
  1664. from the ATAG list and store it at run time into the appended DTB.
  1665. choice
  1666. prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
  1667. default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1668. config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
  1669. bool "Use bootloader kernel arguments if available"
  1670. help
  1671. Uses the command-line options passed by the boot loader instead of
  1672. the device tree bootargs property. If the boot loader doesn't provide
  1673. any, the device tree bootargs property will be used.
  1674. config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
  1675. bool "Extend with bootloader kernel arguments"
  1676. help
  1677. The command-line arguments provided by the boot loader will be
  1678. appended to the the device tree bootargs property.
  1679. endchoice
  1680. config CMDLINE
  1681. string "Default kernel command string"
  1682. default ""
  1683. help
  1684. On some architectures (EBSA110 and CATS), there is currently no way
  1685. for the boot loader to pass arguments to the kernel. For these
  1686. architectures, you should supply some command-line options at build
  1687. time by entering them here. As a minimum, you should specify the
  1688. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  1689. choice
  1690. prompt "Kernel command line type" if CMDLINE != ""
  1691. default CMDLINE_FROM_BOOTLOADER
  1692. depends on ATAGS
  1693. config CMDLINE_FROM_BOOTLOADER
  1694. bool "Use bootloader kernel arguments if available"
  1695. help
  1696. Uses the command-line options passed by the boot loader. If
  1697. the boot loader doesn't provide any, the default kernel command
  1698. string provided in CMDLINE will be used.
  1699. config CMDLINE_EXTEND
  1700. bool "Extend bootloader kernel arguments"
  1701. help
  1702. The command-line arguments provided by the boot loader will be
  1703. appended to the default kernel command string.
  1704. config CMDLINE_FORCE
  1705. bool "Always use the default kernel command string"
  1706. help
  1707. Always use the default kernel command string, even if the boot
  1708. loader passes other arguments to the kernel.
  1709. This is useful if you cannot or don't want to change the
  1710. command-line options your boot loader passes to the kernel.
  1711. endchoice
  1712. config XIP_KERNEL
  1713. bool "Kernel Execute-In-Place from ROM"
  1714. depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM
  1715. help
  1716. Execute-In-Place allows the kernel to run from non-volatile storage
  1717. directly addressable by the CPU, such as NOR flash. This saves RAM
  1718. space since the text section of the kernel is not loaded from flash
  1719. to RAM. Read-write sections, such as the data section and stack,
  1720. are still copied to RAM. The XIP kernel is not compressed since
  1721. it has to run directly from flash, so it will take more space to
  1722. store it. The flash address used to link the kernel object files,
  1723. and for storing it, is configuration dependent. Therefore, if you
  1724. say Y here, you must know the proper physical address where to
  1725. store the kernel image depending on your own flash memory usage.
  1726. Also note that the make target becomes "make xipImage" rather than
  1727. "make zImage" or "make Image". The final kernel binary to put in
  1728. ROM memory will be arch/arm/boot/xipImage.
  1729. If unsure, say N.
  1730. config XIP_PHYS_ADDR
  1731. hex "XIP Kernel Physical Location"
  1732. depends on XIP_KERNEL
  1733. default "0x00080000"
  1734. help
  1735. This is the physical address in your flash memory the kernel will
  1736. be linked for and stored to. This address is dependent on your
  1737. own flash usage.
  1738. config KEXEC
  1739. bool "Kexec system call (EXPERIMENTAL)"
  1740. depends on (!SMP || PM_SLEEP_SMP)
  1741. help
  1742. kexec is a system call that implements the ability to shutdown your
  1743. current kernel, and to start another kernel. It is like a reboot
  1744. but it is independent of the system firmware. And like a reboot
  1745. you can start any kernel with it, not just Linux.
  1746. It is an ongoing process to be certain the hardware in a machine
  1747. is properly shutdown, so do not be surprised if this code does not
  1748. initially work for you. It may help to enable device hotplugging
  1749. support.
  1750. config ATAGS_PROC
  1751. bool "Export atags in procfs"
  1752. depends on ATAGS && KEXEC
  1753. default y
  1754. help
  1755. Should the atags used to boot the kernel be exported in an "atags"
  1756. file in procfs. Useful with kexec.
  1757. config CRASH_DUMP
  1758. bool "Build kdump crash kernel (EXPERIMENTAL)"
  1759. help
  1760. Generate crash dump after being started by kexec. This should
  1761. be normally only set in special crash dump kernels which are
  1762. loaded in the main kernel with kexec-tools into a specially
  1763. reserved region and then later executed after a crash by
  1764. kdump/kexec. The crash dump kernel must be compiled to a
  1765. memory address not used by the main kernel
  1766. For more details see Documentation/kdump/kdump.txt
  1767. config AUTO_ZRELADDR
  1768. bool "Auto calculation of the decompressed kernel image address"
  1769. depends on !ZBOOT_ROM
  1770. help
  1771. ZRELADDR is the physical address where the decompressed kernel
  1772. image will be placed. If AUTO_ZRELADDR is selected, the address
  1773. will be determined at run-time by masking the current IP with
  1774. 0xf8000000. This assumes the zImage being placed in the first 128MB
  1775. from start of memory.
  1776. endmenu
  1777. menu "CPU Power Management"
  1778. if ARCH_HAS_CPUFREQ
  1779. source "drivers/cpufreq/Kconfig"
  1780. endif
  1781. source "drivers/cpuidle/Kconfig"
  1782. endmenu
  1783. menu "Floating point emulation"
  1784. comment "At least one emulation must be selected"
  1785. config FPE_NWFPE
  1786. bool "NWFPE math emulation"
  1787. depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
  1788. ---help---
  1789. Say Y to include the NWFPE floating point emulator in the kernel.
  1790. This is necessary to run most binaries. Linux does not currently
  1791. support floating point hardware so you need to say Y here even if
  1792. your machine has an FPA or floating point co-processor podule.
  1793. You may say N here if you are going to load the Acorn FPEmulator
  1794. early in the bootup.
  1795. config FPE_NWFPE_XP
  1796. bool "Support extended precision"
  1797. depends on FPE_NWFPE
  1798. help
  1799. Say Y to include 80-bit support in the kernel floating-point
  1800. emulator. Otherwise, only 32 and 64-bit support is compiled in.
  1801. Note that gcc does not generate 80-bit operations by default,
  1802. so in most cases this option only enlarges the size of the
  1803. floating point emulator without any good reason.
  1804. You almost surely want to say N here.
  1805. config FPE_FASTFPE
  1806. bool "FastFPE math emulation (EXPERIMENTAL)"
  1807. depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
  1808. ---help---
  1809. Say Y here to include the FAST floating point emulator in the kernel.
  1810. This is an experimental much faster emulator which now also has full
  1811. precision for the mantissa. It does not support any exceptions.
  1812. It is very simple, and approximately 3-6 times faster than NWFPE.
  1813. It should be sufficient for most programs. It may be not suitable
  1814. for scientific calculations, but you have to check this for yourself.
  1815. If you do not feel you need a faster FP emulation you should better
  1816. choose NWFPE.
  1817. config VFP
  1818. bool "VFP-format floating point maths"
  1819. depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
  1820. help
  1821. Say Y to include VFP support code in the kernel. This is needed
  1822. if your hardware includes a VFP unit.
  1823. Please see <file:Documentation/arm/VFP/release-notes.txt> for
  1824. release notes and additional status information.
  1825. Say N if your target does not have VFP hardware.
  1826. config VFPv3
  1827. bool
  1828. depends on VFP
  1829. default y if CPU_V7
  1830. config NEON
  1831. bool "Advanced SIMD (NEON) Extension support"
  1832. depends on VFPv3 && CPU_V7
  1833. help
  1834. Say Y to include support code for NEON, the ARMv7 Advanced SIMD
  1835. Extension.
  1836. endmenu
  1837. menu "Userspace binary formats"
  1838. source "fs/Kconfig.binfmt"
  1839. config ARTHUR
  1840. tristate "RISC OS personality"
  1841. depends on !AEABI
  1842. help
  1843. Say Y here to include the kernel code necessary if you want to run
  1844. Acorn RISC OS/Arthur binaries under Linux. This code is still very
  1845. experimental; if this sounds frightening, say N and sleep in peace.
  1846. You can also say M here to compile this support as a module (which
  1847. will be called arthur).
  1848. endmenu
  1849. menu "Power management options"
  1850. source "kernel/power/Kconfig"
  1851. config ARCH_SUSPEND_POSSIBLE
  1852. depends on !ARCH_S5PC100
  1853. depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \
  1854. CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
  1855. def_bool y
  1856. config ARM_CPU_SUSPEND
  1857. def_bool PM_SLEEP
  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"
  1866. source "arch/arm/kvm/Kconfig"