1config ARM 2 bool 3 default y 4 select ARCH_BINFMT_ELF_RANDOMIZE_PIE 5 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 6 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 7 select ARCH_HAVE_CUSTOM_GPIO_H 8 select ARCH_HAS_GCOV_PROFILE_ALL 9 select ARCH_MIGHT_HAVE_PC_PARPORT 10 select ARCH_SUPPORTS_ATOMIC_RMW 11 select ARCH_USE_BUILTIN_BSWAP 12 select ARCH_USE_CMPXCHG_LOCKREF 13 select ARCH_WANT_IPC_PARSE_VERSION 14 select BUILDTIME_EXTABLE_SORT if MMU 15 select CLONE_BACKWARDS 16 select CPU_PM if (SUSPEND || CPU_IDLE) 17 select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS 18 select GENERIC_ALLOCATOR 19 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI) 20 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 21 select GENERIC_IDLE_POLL_SETUP 22 select GENERIC_IRQ_PROBE 23 select GENERIC_IRQ_SHOW 24 select GENERIC_PCI_IOMAP 25 select GENERIC_SCHED_CLOCK 26 select GENERIC_SMP_IDLE_THREAD 27 select GENERIC_STRNCPY_FROM_USER 28 select GENERIC_STRNLEN_USER 29 select HANDLE_DOMAIN_IRQ 30 select HARDIRQS_SW_RESEND 31 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT) 32 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 33 select HAVE_ARCH_KGDB 34 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) 35 select HAVE_ARCH_TRACEHOOK 36 select HAVE_BPF_JIT 37 select HAVE_CC_STACKPROTECTOR 38 select HAVE_CONTEXT_TRACKING 39 select HAVE_C_RECORDMCOUNT 40 select HAVE_DEBUG_KMEMLEAK 41 select HAVE_DMA_API_DEBUG 42 select HAVE_DMA_ATTRS 43 select HAVE_DMA_CONTIGUOUS if MMU 44 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) 45 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU 46 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL) 47 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL) 48 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL) 49 select HAVE_GENERIC_DMA_COHERENT 50 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)) 51 select HAVE_IDE if PCI || ISA || PCMCIA 52 select HAVE_IRQ_TIME_ACCOUNTING 53 select HAVE_KERNEL_GZIP 54 select HAVE_KERNEL_LZ4 55 select HAVE_KERNEL_LZMA 56 select HAVE_KERNEL_LZO 57 select HAVE_KERNEL_XZ 58 select HAVE_KPROBES if !XIP_KERNEL 59 select HAVE_KRETPROBES if (HAVE_KPROBES) 60 select HAVE_MEMBLOCK 61 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND 62 select HAVE_OPROFILE if (HAVE_PERF_EVENTS) 63 select HAVE_PERF_EVENTS 64 select HAVE_PERF_REGS 65 select HAVE_PERF_USER_STACK_DUMP 66 select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE) 67 select HAVE_REGS_AND_STACK_ACCESS_API 68 select HAVE_SYSCALL_TRACEPOINTS 69 select HAVE_UID16 70 select HAVE_VIRT_CPU_ACCOUNTING_GEN 71 select IRQ_FORCED_THREADING 72 select MODULES_USE_ELF_REL 73 select NO_BOOTMEM 74 select OLD_SIGACTION 75 select OLD_SIGSUSPEND3 76 select PERF_USE_VMALLOC 77 select RTC_LIB 78 select SYS_SUPPORTS_APM_EMULATION 79 # Above selects are sorted alphabetically; please add new ones 80 # according to that. Thanks. 81 help 82 The ARM series is a line of low-power-consumption RISC chip designs 83 licensed by ARM Ltd and targeted at embedded applications and 84 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 85 manufactured, but legacy ARM-based PC hardware remains popular in 86 Europe. There is an ARM Linux project with a web page at 87 <http://www.arm.linux.org.uk/>. 88 89config ARM_HAS_SG_CHAIN 90 select ARCH_HAS_SG_CHAIN 91 bool 92 93config NEED_SG_DMA_LENGTH 94 bool 95 96config ARM_DMA_USE_IOMMU 97 bool 98 select ARM_HAS_SG_CHAIN 99 select NEED_SG_DMA_LENGTH 100 101if ARM_DMA_USE_IOMMU 102 103config ARM_DMA_IOMMU_ALIGNMENT 104 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" 105 range 4 9 106 default 8 107 help 108 DMA mapping framework by default aligns all buffers to the smallest 109 PAGE_SIZE order which is greater than or equal to the requested buffer 110 size. This works well for buffers up to a few hundreds kilobytes, but 111 for larger buffers it just a waste of address space. Drivers which has 112 relatively small addressing window (like 64Mib) might run out of 113 virtual space with just a few allocations. 114 115 With this parameter you can specify the maximum PAGE_SIZE order for 116 DMA IOMMU buffers. Larger buffers will be aligned only to this 117 specified order. The order is expressed as a power of two multiplied 118 by the PAGE_SIZE. 119 120endif 121 122config MIGHT_HAVE_PCI 123 bool 124 125config SYS_SUPPORTS_APM_EMULATION 126 bool 127 128config HAVE_TCM 129 bool 130 select GENERIC_ALLOCATOR 131 132config HAVE_PROC_CPU 133 bool 134 135config NO_IOPORT_MAP 136 bool 137 138config EISA 139 bool 140 ---help--- 141 The Extended Industry Standard Architecture (EISA) bus was 142 developed as an open alternative to the IBM MicroChannel bus. 143 144 The EISA bus provided some of the features of the IBM MicroChannel 145 bus while maintaining backward compatibility with cards made for 146 the older ISA bus. The EISA bus saw limited use between 1988 and 147 1995 when it was made obsolete by the PCI bus. 148 149 Say Y here if you are building a kernel for an EISA-based machine. 150 151 Otherwise, say N. 152 153config SBUS 154 bool 155 156config STACKTRACE_SUPPORT 157 bool 158 default y 159 160config HAVE_LATENCYTOP_SUPPORT 161 bool 162 depends on !SMP 163 default y 164 165config LOCKDEP_SUPPORT 166 bool 167 default y 168 169config TRACE_IRQFLAGS_SUPPORT 170 bool 171 default y 172 173config RWSEM_XCHGADD_ALGORITHM 174 bool 175 default y 176 177config ARCH_HAS_ILOG2_U32 178 bool 179 180config ARCH_HAS_ILOG2_U64 181 bool 182 183config ARCH_HAS_BANDGAP 184 bool 185 186config GENERIC_HWEIGHT 187 bool 188 default y 189 190config GENERIC_CALIBRATE_DELAY 191 bool 192 default y 193 194config ARCH_MAY_HAVE_PC_FDC 195 bool 196 197config ZONE_DMA 198 bool 199 200config NEED_DMA_MAP_STATE 201 def_bool y 202 203config ARCH_SUPPORTS_UPROBES 204 def_bool y 205 206config ARCH_HAS_DMA_SET_COHERENT_MASK 207 bool 208 209config GENERIC_ISA_DMA 210 bool 211 212config FIQ 213 bool 214 215config NEED_RET_TO_USER 216 bool 217 218config ARCH_MTD_XIP 219 bool 220 221config VECTORS_BASE 222 hex 223 default 0xffff0000 if MMU || CPU_HIGH_VECTOR 224 default DRAM_BASE if REMAP_VECTORS_TO_RAM 225 default 0x00000000 226 help 227 The base address of exception vectors. This must be two pages 228 in size. 229 230config ARM_PATCH_PHYS_VIRT 231 bool "Patch physical to virtual translations at runtime" if EMBEDDED 232 default y 233 depends on !XIP_KERNEL && MMU 234 depends on !ARCH_REALVIEW || !SPARSEMEM 235 help 236 Patch phys-to-virt and virt-to-phys translation functions at 237 boot and module load time according to the position of the 238 kernel in system memory. 239 240 This can only be used with non-XIP MMU kernels where the base 241 of physical memory is at a 16MB boundary. 242 243 Only disable this option if you know that you do not require 244 this feature (eg, building a kernel for a single machine) and 245 you need to shrink the kernel to the minimal size. 246 247config NEED_MACH_IO_H 248 bool 249 help 250 Select this when mach/io.h is required to provide special 251 definitions for this platform. The need for mach/io.h should 252 be avoided when possible. 253 254config NEED_MACH_MEMORY_H 255 bool 256 help 257 Select this when mach/memory.h is required to provide special 258 definitions for this platform. The need for mach/memory.h should 259 be avoided when possible. 260 261config PHYS_OFFSET 262 hex "Physical address of main memory" if MMU 263 depends on !ARM_PATCH_PHYS_VIRT 264 default DRAM_BASE if !MMU 265 default 0x00000000 if ARCH_EBSA110 || \ 266 EP93XX_SDCE3_SYNC_PHYS_OFFSET || \ 267 ARCH_FOOTBRIDGE || \ 268 ARCH_INTEGRATOR || \ 269 ARCH_IOP13XX || \ 270 ARCH_KS8695 || \ 271 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET) 272 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC 273 default 0x20000000 if ARCH_S5PV210 274 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET 275 default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100 276 default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET 277 default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET 278 default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET 279 help 280 Please provide the physical address corresponding to the 281 location of main memory in your system. 282 283config GENERIC_BUG 284 def_bool y 285 depends on BUG 286 287source "init/Kconfig" 288 289source "kernel/Kconfig.freezer" 290 291menu "System Type" 292 293config MMU 294 bool "MMU-based Paged Memory Management Support" 295 default y 296 help 297 Select if you want MMU-based virtualised addressing space 298 support by paged memory management. If unsure, say 'Y'. 299 300# 301# The "ARM system type" choice list is ordered alphabetically by option 302# text. Please add new entries in the option alphabetic order. 303# 304choice 305 prompt "ARM system type" 306 default ARCH_VERSATILE if !MMU 307 default ARCH_MULTIPLATFORM if MMU 308 309config ARCH_MULTIPLATFORM 310 bool "Allow multiple platforms to be selected" 311 depends on MMU 312 select ARCH_WANT_OPTIONAL_GPIOLIB 313 select ARM_HAS_SG_CHAIN 314 select ARM_PATCH_PHYS_VIRT 315 select AUTO_ZRELADDR 316 select CLKSRC_OF 317 select COMMON_CLK 318 select GENERIC_CLOCKEVENTS 319 select MIGHT_HAVE_PCI 320 select MULTI_IRQ_HANDLER 321 select SPARSE_IRQ 322 select USE_OF 323 324config ARCH_REALVIEW 325 bool "ARM Ltd. RealView family" 326 select ARCH_WANT_OPTIONAL_GPIOLIB 327 select ARM_AMBA 328 select ARM_TIMER_SP804 329 select COMMON_CLK 330 select COMMON_CLK_VERSATILE 331 select GENERIC_CLOCKEVENTS 332 select GPIO_PL061 if GPIOLIB 333 select ICST 334 select NEED_MACH_MEMORY_H 335 select PLAT_VERSATILE 336 select PLAT_VERSATILE_SCHED_CLOCK 337 help 338 This enables support for ARM Ltd RealView boards. 339 340config ARCH_VERSATILE 341 bool "ARM Ltd. Versatile family" 342 select ARCH_WANT_OPTIONAL_GPIOLIB 343 select ARM_AMBA 344 select ARM_TIMER_SP804 345 select ARM_VIC 346 select CLKDEV_LOOKUP 347 select GENERIC_CLOCKEVENTS 348 select HAVE_MACH_CLKDEV 349 select ICST 350 select PLAT_VERSATILE 351 select PLAT_VERSATILE_CLOCK 352 select PLAT_VERSATILE_SCHED_CLOCK 353 select VERSATILE_FPGA_IRQ 354 help 355 This enables support for ARM Ltd Versatile board. 356 357config ARCH_AT91 358 bool "Atmel AT91" 359 select ARCH_REQUIRE_GPIOLIB 360 select CLKDEV_LOOKUP 361 select IRQ_DOMAIN 362 select NEED_MACH_IO_H if PCCARD 363 select PINCTRL 364 select PINCTRL_AT91 365 select USE_OF 366 help 367 This enables support for systems based on Atmel 368 AT91RM9200, AT91SAM9 and SAMA5 processors. 369 370config ARCH_CLPS711X 371 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based" 372 select ARCH_REQUIRE_GPIOLIB 373 select AUTO_ZRELADDR 374 select CLKSRC_MMIO 375 select COMMON_CLK 376 select CPU_ARM720T 377 select GENERIC_CLOCKEVENTS 378 select MFD_SYSCON 379 select SOC_BUS 380 help 381 Support for Cirrus Logic 711x/721x/731x based boards. 382 383config ARCH_GEMINI 384 bool "Cortina Systems Gemini" 385 select ARCH_REQUIRE_GPIOLIB 386 select CLKSRC_MMIO 387 select CPU_FA526 388 select GENERIC_CLOCKEVENTS 389 help 390 Support for the Cortina Systems Gemini family SoCs 391 392config ARCH_EBSA110 393 bool "EBSA-110" 394 select ARCH_USES_GETTIMEOFFSET 395 select CPU_SA110 396 select ISA 397 select NEED_MACH_IO_H 398 select NEED_MACH_MEMORY_H 399 select NO_IOPORT_MAP 400 help 401 This is an evaluation board for the StrongARM processor available 402 from Digital. It has limited hardware on-board, including an 403 Ethernet interface, two PCMCIA sockets, two serial ports and a 404 parallel port. 405 406config ARCH_EFM32 407 bool "Energy Micro efm32" 408 depends on !MMU 409 select ARCH_REQUIRE_GPIOLIB 410 select ARM_NVIC 411 select AUTO_ZRELADDR 412 select CLKSRC_OF 413 select COMMON_CLK 414 select CPU_V7M 415 select GENERIC_CLOCKEVENTS 416 select NO_DMA 417 select NO_IOPORT_MAP 418 select SPARSE_IRQ 419 select USE_OF 420 help 421 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko 422 processors. 423 424config ARCH_EP93XX 425 bool "EP93xx-based" 426 select ARCH_HAS_HOLES_MEMORYMODEL 427 select ARCH_REQUIRE_GPIOLIB 428 select ARCH_USES_GETTIMEOFFSET 429 select ARM_AMBA 430 select ARM_VIC 431 select CLKDEV_LOOKUP 432 select CPU_ARM920T 433 help 434 This enables support for the Cirrus EP93xx series of CPUs. 435 436config ARCH_FOOTBRIDGE 437 bool "FootBridge" 438 select CPU_SA110 439 select FOOTBRIDGE 440 select GENERIC_CLOCKEVENTS 441 select HAVE_IDE 442 select NEED_MACH_IO_H if !MMU 443 select NEED_MACH_MEMORY_H 444 help 445 Support for systems based on the DC21285 companion chip 446 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 447 448config ARCH_NETX 449 bool "Hilscher NetX based" 450 select ARM_VIC 451 select CLKSRC_MMIO 452 select CPU_ARM926T 453 select GENERIC_CLOCKEVENTS 454 help 455 This enables support for systems based on the Hilscher NetX Soc 456 457config ARCH_IOP13XX 458 bool "IOP13xx-based" 459 depends on MMU 460 select CPU_XSC3 461 select NEED_MACH_MEMORY_H 462 select NEED_RET_TO_USER 463 select PCI 464 select PLAT_IOP 465 select VMSPLIT_1G 466 select SPARSE_IRQ 467 help 468 Support for Intel's IOP13XX (XScale) family of processors. 469 470config ARCH_IOP32X 471 bool "IOP32x-based" 472 depends on MMU 473 select ARCH_REQUIRE_GPIOLIB 474 select CPU_XSCALE 475 select GPIO_IOP 476 select NEED_RET_TO_USER 477 select PCI 478 select PLAT_IOP 479 help 480 Support for Intel's 80219 and IOP32X (XScale) family of 481 processors. 482 483config ARCH_IOP33X 484 bool "IOP33x-based" 485 depends on MMU 486 select ARCH_REQUIRE_GPIOLIB 487 select CPU_XSCALE 488 select GPIO_IOP 489 select NEED_RET_TO_USER 490 select PCI 491 select PLAT_IOP 492 help 493 Support for Intel's IOP33X (XScale) family of processors. 494 495config ARCH_IXP4XX 496 bool "IXP4xx-based" 497 depends on MMU 498 select ARCH_HAS_DMA_SET_COHERENT_MASK 499 select ARCH_REQUIRE_GPIOLIB 500 select ARCH_SUPPORTS_BIG_ENDIAN 501 select CLKSRC_MMIO 502 select CPU_XSCALE 503 select DMABOUNCE if PCI 504 select GENERIC_CLOCKEVENTS 505 select MIGHT_HAVE_PCI 506 select NEED_MACH_IO_H 507 select USB_EHCI_BIG_ENDIAN_DESC 508 select USB_EHCI_BIG_ENDIAN_MMIO 509 help 510 Support for Intel's IXP4XX (XScale) family of processors. 511 512config ARCH_DOVE 513 bool "Marvell Dove" 514 select ARCH_REQUIRE_GPIOLIB 515 select CPU_PJ4 516 select GENERIC_CLOCKEVENTS 517 select MIGHT_HAVE_PCI 518 select MVEBU_MBUS 519 select PINCTRL 520 select PINCTRL_DOVE 521 select PLAT_ORION_LEGACY 522 help 523 Support for the Marvell Dove SoC 88AP510 524 525config ARCH_MV78XX0 526 bool "Marvell MV78xx0" 527 select ARCH_REQUIRE_GPIOLIB 528 select CPU_FEROCEON 529 select GENERIC_CLOCKEVENTS 530 select MVEBU_MBUS 531 select PCI 532 select PLAT_ORION_LEGACY 533 help 534 Support for the following Marvell MV78xx0 series SoCs: 535 MV781x0, MV782x0. 536 537config ARCH_ORION5X 538 bool "Marvell Orion" 539 depends on MMU 540 select ARCH_REQUIRE_GPIOLIB 541 select CPU_FEROCEON 542 select GENERIC_CLOCKEVENTS 543 select MVEBU_MBUS 544 select PCI 545 select PLAT_ORION_LEGACY 546 help 547 Support for the following Marvell Orion 5x series SoCs: 548 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 549 Orion-2 (5281), Orion-1-90 (6183). 550 551config ARCH_MMP 552 bool "Marvell PXA168/910/MMP2" 553 depends on MMU 554 select ARCH_REQUIRE_GPIOLIB 555 select CLKDEV_LOOKUP 556 select GENERIC_ALLOCATOR 557 select GENERIC_CLOCKEVENTS 558 select GPIO_PXA 559 select IRQ_DOMAIN 560 select MULTI_IRQ_HANDLER 561 select PINCTRL 562 select PLAT_PXA 563 select SPARSE_IRQ 564 help 565 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 566 567config ARCH_KS8695 568 bool "Micrel/Kendin KS8695" 569 select ARCH_REQUIRE_GPIOLIB 570 select CLKSRC_MMIO 571 select CPU_ARM922T 572 select GENERIC_CLOCKEVENTS 573 select NEED_MACH_MEMORY_H 574 help 575 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 576 System-on-Chip devices. 577 578config ARCH_W90X900 579 bool "Nuvoton W90X900 CPU" 580 select ARCH_REQUIRE_GPIOLIB 581 select CLKDEV_LOOKUP 582 select CLKSRC_MMIO 583 select CPU_ARM926T 584 select GENERIC_CLOCKEVENTS 585 help 586 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 587 At present, the w90x900 has been renamed nuc900, regarding 588 the ARM series product line, you can login the following 589 link address to know more. 590 591 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 592 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 593 594config ARCH_LPC32XX 595 bool "NXP LPC32XX" 596 select ARCH_REQUIRE_GPIOLIB 597 select ARM_AMBA 598 select CLKDEV_LOOKUP 599 select CLKSRC_MMIO 600 select CPU_ARM926T 601 select GENERIC_CLOCKEVENTS 602 select HAVE_IDE 603 select USE_OF 604 help 605 Support for the NXP LPC32XX family of processors 606 607config ARCH_PXA 608 bool "PXA2xx/PXA3xx-based" 609 depends on MMU 610 select ARCH_MTD_XIP 611 select ARCH_REQUIRE_GPIOLIB 612 select ARM_CPU_SUSPEND if PM 613 select AUTO_ZRELADDR 614 select CLKDEV_LOOKUP 615 select CLKSRC_MMIO 616 select CLKSRC_OF 617 select GENERIC_CLOCKEVENTS 618 select GPIO_PXA 619 select HAVE_IDE 620 select MULTI_IRQ_HANDLER 621 select PLAT_PXA 622 select SPARSE_IRQ 623 help 624 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 625 626config ARCH_MSM 627 bool "Qualcomm MSM (non-multiplatform)" 628 select ARCH_REQUIRE_GPIOLIB 629 select COMMON_CLK 630 select GENERIC_CLOCKEVENTS 631 help 632 Support for Qualcomm MSM/QSD based systems. This runs on the 633 apps processor of the MSM/QSD and depends on a shared memory 634 interface to the modem processor which runs the baseband 635 stack and controls some vital subsystems 636 (clock and power control, etc). 637 638config ARCH_SHMOBILE_LEGACY 639 bool "Renesas ARM SoCs (non-multiplatform)" 640 select ARCH_SHMOBILE 641 select ARM_PATCH_PHYS_VIRT if MMU 642 select CLKDEV_LOOKUP 643 select CPU_V7 644 select GENERIC_CLOCKEVENTS 645 select HAVE_ARM_SCU if SMP 646 select HAVE_ARM_TWD if SMP 647 select HAVE_MACH_CLKDEV 648 select HAVE_SMP 649 select MIGHT_HAVE_CACHE_L2X0 650 select MULTI_IRQ_HANDLER 651 select NO_IOPORT_MAP 652 select PINCTRL 653 select PM_GENERIC_DOMAINS if PM 654 select SH_CLK_CPG 655 select SPARSE_IRQ 656 help 657 Support for Renesas ARM SoC platforms using a non-multiplatform 658 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car 659 and RZ families. 660 661config ARCH_RPC 662 bool "RiscPC" 663 select ARCH_ACORN 664 select ARCH_MAY_HAVE_PC_FDC 665 select ARCH_SPARSEMEM_ENABLE 666 select ARCH_USES_GETTIMEOFFSET 667 select CPU_SA110 668 select FIQ 669 select HAVE_IDE 670 select HAVE_PATA_PLATFORM 671 select ISA_DMA_API 672 select NEED_MACH_IO_H 673 select NEED_MACH_MEMORY_H 674 select NO_IOPORT_MAP 675 select VIRT_TO_BUS 676 help 677 On the Acorn Risc-PC, Linux can support the internal IDE disk and 678 CD-ROM interface, serial and parallel port, and the floppy drive. 679 680config ARCH_SA1100 681 bool "SA1100-based" 682 select ARCH_MTD_XIP 683 select ARCH_REQUIRE_GPIOLIB 684 select ARCH_SPARSEMEM_ENABLE 685 select CLKDEV_LOOKUP 686 select CLKSRC_MMIO 687 select CPU_FREQ 688 select CPU_SA1100 689 select GENERIC_CLOCKEVENTS 690 select HAVE_IDE 691 select IRQ_DOMAIN 692 select ISA 693 select MULTI_IRQ_HANDLER 694 select NEED_MACH_MEMORY_H 695 select SPARSE_IRQ 696 help 697 Support for StrongARM 11x0 based boards. 698 699config ARCH_S3C24XX 700 bool "Samsung S3C24XX SoCs" 701 select ARCH_REQUIRE_GPIOLIB 702 select ATAGS 703 select CLKDEV_LOOKUP 704 select CLKSRC_SAMSUNG_PWM 705 select GENERIC_CLOCKEVENTS 706 select GPIO_SAMSUNG 707 select HAVE_S3C2410_I2C if I2C 708 select HAVE_S3C2410_WATCHDOG if WATCHDOG 709 select HAVE_S3C_RTC if RTC_CLASS 710 select MULTI_IRQ_HANDLER 711 select NEED_MACH_IO_H 712 select SAMSUNG_ATAGS 713 help 714 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 715 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 716 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 717 Samsung SMDK2410 development board (and derivatives). 718 719config ARCH_S3C64XX 720 bool "Samsung S3C64XX" 721 select ARCH_REQUIRE_GPIOLIB 722 select ARM_AMBA 723 select ARM_VIC 724 select ATAGS 725 select CLKDEV_LOOKUP 726 select CLKSRC_SAMSUNG_PWM 727 select COMMON_CLK_SAMSUNG 728 select CPU_V6K 729 select GENERIC_CLOCKEVENTS 730 select GPIO_SAMSUNG 731 select HAVE_S3C2410_I2C if I2C 732 select HAVE_S3C2410_WATCHDOG if WATCHDOG 733 select HAVE_TCM 734 select NO_IOPORT_MAP 735 select PLAT_SAMSUNG 736 select PM_GENERIC_DOMAINS if PM 737 select S3C_DEV_NAND 738 select S3C_GPIO_TRACK 739 select SAMSUNG_ATAGS 740 select SAMSUNG_WAKEMASK 741 select SAMSUNG_WDT_RESET 742 help 743 Samsung S3C64XX series based systems 744 745config ARCH_DAVINCI 746 bool "TI DaVinci" 747 select ARCH_HAS_HOLES_MEMORYMODEL 748 select ARCH_REQUIRE_GPIOLIB 749 select CLKDEV_LOOKUP 750 select GENERIC_ALLOCATOR 751 select GENERIC_CLOCKEVENTS 752 select GENERIC_IRQ_CHIP 753 select HAVE_IDE 754 select TI_PRIV_EDMA 755 select USE_OF 756 select ZONE_DMA 757 help 758 Support for TI's DaVinci platform. 759 760config ARCH_OMAP1 761 bool "TI OMAP1" 762 depends on MMU 763 select ARCH_HAS_HOLES_MEMORYMODEL 764 select ARCH_OMAP 765 select ARCH_REQUIRE_GPIOLIB 766 select CLKDEV_LOOKUP 767 select CLKSRC_MMIO 768 select GENERIC_CLOCKEVENTS 769 select GENERIC_IRQ_CHIP 770 select HAVE_IDE 771 select IRQ_DOMAIN 772 select NEED_MACH_IO_H if PCCARD 773 select NEED_MACH_MEMORY_H 774 help 775 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 776 777endchoice 778 779menu "Multiple platform selection" 780 depends on ARCH_MULTIPLATFORM 781 782comment "CPU Core family selection" 783 784config ARCH_MULTI_V4 785 bool "ARMv4 based platforms (FA526)" 786 depends on !ARCH_MULTI_V6_V7 787 select ARCH_MULTI_V4_V5 788 select CPU_FA526 789 790config ARCH_MULTI_V4T 791 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 792 depends on !ARCH_MULTI_V6_V7 793 select ARCH_MULTI_V4_V5 794 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 795 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 796 CPU_ARM925T || CPU_ARM940T) 797 798config ARCH_MULTI_V5 799 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 800 depends on !ARCH_MULTI_V6_V7 801 select ARCH_MULTI_V4_V5 802 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 803 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 804 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 805 806config ARCH_MULTI_V4_V5 807 bool 808 809config ARCH_MULTI_V6 810 bool "ARMv6 based platforms (ARM11)" 811 select ARCH_MULTI_V6_V7 812 select CPU_V6K 813 814config ARCH_MULTI_V7 815 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 816 default y 817 select ARCH_MULTI_V6_V7 818 select CPU_V7 819 select HAVE_SMP 820 821config ARCH_MULTI_V6_V7 822 bool 823 select MIGHT_HAVE_CACHE_L2X0 824 825config ARCH_MULTI_CPU_AUTO 826 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 827 select ARCH_MULTI_V5 828 829endmenu 830 831config ARCH_VIRT 832 bool "Dummy Virtual Machine" if ARCH_MULTI_V7 833 select ARM_AMBA 834 select ARM_GIC 835 select ARM_PSCI 836 select HAVE_ARM_ARCH_TIMER 837 838# 839# This is sorted alphabetically by mach-* pathname. However, plat-* 840# Kconfigs may be included either alphabetically (according to the 841# plat- suffix) or along side the corresponding mach-* source. 842# 843source "arch/arm/mach-mvebu/Kconfig" 844 845source "arch/arm/mach-asm9260/Kconfig" 846 847source "arch/arm/mach-at91/Kconfig" 848 849source "arch/arm/mach-axxia/Kconfig" 850 851source "arch/arm/mach-bcm/Kconfig" 852 853source "arch/arm/mach-berlin/Kconfig" 854 855source "arch/arm/mach-clps711x/Kconfig" 856 857source "arch/arm/mach-cns3xxx/Kconfig" 858 859source "arch/arm/mach-davinci/Kconfig" 860 861source "arch/arm/mach-dove/Kconfig" 862 863source "arch/arm/mach-ep93xx/Kconfig" 864 865source "arch/arm/mach-footbridge/Kconfig" 866 867source "arch/arm/mach-gemini/Kconfig" 868 869source "arch/arm/mach-highbank/Kconfig" 870 871source "arch/arm/mach-hisi/Kconfig" 872 873source "arch/arm/mach-integrator/Kconfig" 874 875source "arch/arm/mach-iop32x/Kconfig" 876 877source "arch/arm/mach-iop33x/Kconfig" 878 879source "arch/arm/mach-iop13xx/Kconfig" 880 881source "arch/arm/mach-ixp4xx/Kconfig" 882 883source "arch/arm/mach-keystone/Kconfig" 884 885source "arch/arm/mach-ks8695/Kconfig" 886 887source "arch/arm/mach-meson/Kconfig" 888 889source "arch/arm/mach-msm/Kconfig" 890 891source "arch/arm/mach-moxart/Kconfig" 892 893source "arch/arm/mach-mv78xx0/Kconfig" 894 895source "arch/arm/mach-imx/Kconfig" 896 897source "arch/arm/mach-mediatek/Kconfig" 898 899source "arch/arm/mach-mxs/Kconfig" 900 901source "arch/arm/mach-netx/Kconfig" 902 903source "arch/arm/mach-nomadik/Kconfig" 904 905source "arch/arm/mach-nspire/Kconfig" 906 907source "arch/arm/plat-omap/Kconfig" 908 909source "arch/arm/mach-omap1/Kconfig" 910 911source "arch/arm/mach-omap2/Kconfig" 912 913source "arch/arm/mach-orion5x/Kconfig" 914 915source "arch/arm/mach-picoxcell/Kconfig" 916 917source "arch/arm/mach-pxa/Kconfig" 918source "arch/arm/plat-pxa/Kconfig" 919 920source "arch/arm/mach-mmp/Kconfig" 921 922source "arch/arm/mach-qcom/Kconfig" 923 924source "arch/arm/mach-realview/Kconfig" 925 926source "arch/arm/mach-rockchip/Kconfig" 927 928source "arch/arm/mach-sa1100/Kconfig" 929 930source "arch/arm/mach-socfpga/Kconfig" 931 932source "arch/arm/mach-spear/Kconfig" 933 934source "arch/arm/mach-sti/Kconfig" 935 936source "arch/arm/mach-s3c24xx/Kconfig" 937 938source "arch/arm/mach-s3c64xx/Kconfig" 939 940source "arch/arm/mach-s5pv210/Kconfig" 941 942source "arch/arm/mach-exynos/Kconfig" 943source "arch/arm/plat-samsung/Kconfig" 944 945source "arch/arm/mach-shmobile/Kconfig" 946 947source "arch/arm/mach-sunxi/Kconfig" 948 949source "arch/arm/mach-prima2/Kconfig" 950 951source "arch/arm/mach-tegra/Kconfig" 952 953source "arch/arm/mach-u300/Kconfig" 954 955source "arch/arm/mach-ux500/Kconfig" 956 957source "arch/arm/mach-versatile/Kconfig" 958 959source "arch/arm/mach-vexpress/Kconfig" 960source "arch/arm/plat-versatile/Kconfig" 961 962source "arch/arm/mach-vt8500/Kconfig" 963 964source "arch/arm/mach-w90x900/Kconfig" 965 966source "arch/arm/mach-zynq/Kconfig" 967 968# Definitions to make life easier 969config ARCH_ACORN 970 bool 971 972config PLAT_IOP 973 bool 974 select GENERIC_CLOCKEVENTS 975 976config PLAT_ORION 977 bool 978 select CLKSRC_MMIO 979 select COMMON_CLK 980 select GENERIC_IRQ_CHIP 981 select IRQ_DOMAIN 982 983config PLAT_ORION_LEGACY 984 bool 985 select PLAT_ORION 986 987config PLAT_PXA 988 bool 989 990config PLAT_VERSATILE 991 bool 992 993config ARM_TIMER_SP804 994 bool 995 select CLKSRC_MMIO 996 select CLKSRC_OF if OF 997 998source "arch/arm/firmware/Kconfig" 999 1000source arch/arm/mm/Kconfig 1001 1002config IWMMXT 1003 bool "Enable iWMMXt support" 1004 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 1005 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 1006 help 1007 Enable support for iWMMXt context switching at run time if 1008 running on a CPU that supports it. 1009 1010config MULTI_IRQ_HANDLER 1011 bool 1012 help 1013 Allow each machine to specify it's own IRQ handler at run time. 1014 1015if !MMU 1016source "arch/arm/Kconfig-nommu" 1017endif 1018 1019config PJ4B_ERRATA_4742 1020 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1021 depends on CPU_PJ4B && MACH_ARMADA_370 1022 default y 1023 help 1024 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1025 Event (WFE) IDLE states, a specific timing sensitivity exists between 1026 the retiring WFI/WFE instructions and the newly issued subsequent 1027 instructions. This sensitivity can result in a CPU hang scenario. 1028 Workaround: 1029 The software must insert either a Data Synchronization Barrier (DSB) 1030 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1031 instruction 1032 1033config ARM_ERRATA_326103 1034 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1035 depends on CPU_V6 1036 help 1037 Executing a SWP instruction to read-only memory does not set bit 11 1038 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1039 treat the access as a read, preventing a COW from occurring and 1040 causing the faulting task to livelock. 1041 1042config ARM_ERRATA_411920 1043 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1044 depends on CPU_V6 || CPU_V6K 1045 help 1046 Invalidation of the Instruction Cache operation can 1047 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1048 It does not affect the MPCore. This option enables the ARM Ltd. 1049 recommended workaround. 1050 1051config ARM_ERRATA_430973 1052 bool "ARM errata: Stale prediction on replaced interworking branch" 1053 depends on CPU_V7 1054 help 1055 This option enables the workaround for the 430973 Cortex-A8 1056 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb 1057 interworking branch is replaced with another code sequence at the 1058 same virtual address, whether due to self-modifying code or virtual 1059 to physical address re-mapping, Cortex-A8 does not recover from the 1060 stale interworking branch prediction. This results in Cortex-A8 1061 executing the new code sequence in the incorrect ARM or Thumb state. 1062 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1063 and also flushes the branch target cache at every context switch. 1064 Note that setting specific bits in the ACTLR register may not be 1065 available in non-secure mode. 1066 1067config ARM_ERRATA_458693 1068 bool "ARM errata: Processor deadlock when a false hazard is created" 1069 depends on CPU_V7 1070 depends on !ARCH_MULTIPLATFORM 1071 help 1072 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1073 erratum. For very specific sequences of memory operations, it is 1074 possible for a hazard condition intended for a cache line to instead 1075 be incorrectly associated with a different cache line. This false 1076 hazard might then cause a processor deadlock. The workaround enables 1077 the L1 caching of the NEON accesses and disables the PLD instruction 1078 in the ACTLR register. Note that setting specific bits in the ACTLR 1079 register may not be available in non-secure mode. 1080 1081config ARM_ERRATA_460075 1082 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1083 depends on CPU_V7 1084 depends on !ARCH_MULTIPLATFORM 1085 help 1086 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1087 erratum. Any asynchronous access to the L2 cache may encounter a 1088 situation in which recent store transactions to the L2 cache are lost 1089 and overwritten with stale memory contents from external memory. The 1090 workaround disables the write-allocate mode for the L2 cache via the 1091 ACTLR register. Note that setting specific bits in the ACTLR register 1092 may not be available in non-secure mode. 1093 1094config ARM_ERRATA_742230 1095 bool "ARM errata: DMB operation may be faulty" 1096 depends on CPU_V7 && SMP 1097 depends on !ARCH_MULTIPLATFORM 1098 help 1099 This option enables the workaround for the 742230 Cortex-A9 1100 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1101 between two write operations may not ensure the correct visibility 1102 ordering of the two writes. This workaround sets a specific bit in 1103 the diagnostic register of the Cortex-A9 which causes the DMB 1104 instruction to behave as a DSB, ensuring the correct behaviour of 1105 the two writes. 1106 1107config ARM_ERRATA_742231 1108 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1109 depends on CPU_V7 && SMP 1110 depends on !ARCH_MULTIPLATFORM 1111 help 1112 This option enables the workaround for the 742231 Cortex-A9 1113 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1114 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1115 accessing some data located in the same cache line, may get corrupted 1116 data due to bad handling of the address hazard when the line gets 1117 replaced from one of the CPUs at the same time as another CPU is 1118 accessing it. This workaround sets specific bits in the diagnostic 1119 register of the Cortex-A9 which reduces the linefill issuing 1120 capabilities of the processor. 1121 1122config ARM_ERRATA_643719 1123 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1124 depends on CPU_V7 && SMP 1125 help 1126 This option enables the workaround for the 643719 Cortex-A9 (prior to 1127 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1128 register returns zero when it should return one. The workaround 1129 corrects this value, ensuring cache maintenance operations which use 1130 it behave as intended and avoiding data corruption. 1131 1132config ARM_ERRATA_720789 1133 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1134 depends on CPU_V7 1135 help 1136 This option enables the workaround for the 720789 Cortex-A9 (prior to 1137 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1138 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1139 As a consequence of this erratum, some TLB entries which should be 1140 invalidated are not, resulting in an incoherency in the system page 1141 tables. The workaround changes the TLB flushing routines to invalidate 1142 entries regardless of the ASID. 1143 1144config ARM_ERRATA_743622 1145 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1146 depends on CPU_V7 1147 depends on !ARCH_MULTIPLATFORM 1148 help 1149 This option enables the workaround for the 743622 Cortex-A9 1150 (r2p*) erratum. Under very rare conditions, a faulty 1151 optimisation in the Cortex-A9 Store Buffer may lead to data 1152 corruption. This workaround sets a specific bit in the diagnostic 1153 register of the Cortex-A9 which disables the Store Buffer 1154 optimisation, preventing the defect from occurring. This has no 1155 visible impact on the overall performance or power consumption of the 1156 processor. 1157 1158config ARM_ERRATA_751472 1159 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1160 depends on CPU_V7 1161 depends on !ARCH_MULTIPLATFORM 1162 help 1163 This option enables the workaround for the 751472 Cortex-A9 (prior 1164 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1165 completion of a following broadcasted operation if the second 1166 operation is received by a CPU before the ICIALLUIS has completed, 1167 potentially leading to corrupted entries in the cache or TLB. 1168 1169config ARM_ERRATA_754322 1170 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1171 depends on CPU_V7 1172 help 1173 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1174 r3p*) erratum. A speculative memory access may cause a page table walk 1175 which starts prior to an ASID switch but completes afterwards. This 1176 can populate the micro-TLB with a stale entry which may be hit with 1177 the new ASID. This workaround places two dsb instructions in the mm 1178 switching code so that no page table walks can cross the ASID switch. 1179 1180config ARM_ERRATA_754327 1181 bool "ARM errata: no automatic Store Buffer drain" 1182 depends on CPU_V7 && SMP 1183 help 1184 This option enables the workaround for the 754327 Cortex-A9 (prior to 1185 r2p0) erratum. The Store Buffer does not have any automatic draining 1186 mechanism and therefore a livelock may occur if an external agent 1187 continuously polls a memory location waiting to observe an update. 1188 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1189 written polling loops from denying visibility of updates to memory. 1190 1191config ARM_ERRATA_364296 1192 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1193 depends on CPU_V6 1194 help 1195 This options enables the workaround for the 364296 ARM1136 1196 r0p2 erratum (possible cache data corruption with 1197 hit-under-miss enabled). It sets the undocumented bit 31 in 1198 the auxiliary control register and the FI bit in the control 1199 register, thus disabling hit-under-miss without putting the 1200 processor into full low interrupt latency mode. ARM11MPCore 1201 is not affected. 1202 1203config ARM_ERRATA_764369 1204 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1205 depends on CPU_V7 && SMP 1206 help 1207 This option enables the workaround for erratum 764369 1208 affecting Cortex-A9 MPCore with two or more processors (all 1209 current revisions). Under certain timing circumstances, a data 1210 cache line maintenance operation by MVA targeting an Inner 1211 Shareable memory region may fail to proceed up to either the 1212 Point of Coherency or to the Point of Unification of the 1213 system. This workaround adds a DSB instruction before the 1214 relevant cache maintenance functions and sets a specific bit 1215 in the diagnostic control register of the SCU. 1216 1217config ARM_ERRATA_775420 1218 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1219 depends on CPU_V7 1220 help 1221 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1222 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1223 operation aborts with MMU exception, it might cause the processor 1224 to deadlock. This workaround puts DSB before executing ISB if 1225 an abort may occur on cache maintenance. 1226 1227config ARM_ERRATA_798181 1228 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1229 depends on CPU_V7 && SMP 1230 help 1231 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1232 adequately shooting down all use of the old entries. This 1233 option enables the Linux kernel workaround for this erratum 1234 which sends an IPI to the CPUs that are running the same ASID 1235 as the one being invalidated. 1236 1237config ARM_ERRATA_773022 1238 bool "ARM errata: incorrect instructions may be executed from loop buffer" 1239 depends on CPU_V7 1240 help 1241 This option enables the workaround for the 773022 Cortex-A15 1242 (up to r0p4) erratum. In certain rare sequences of code, the 1243 loop buffer may deliver incorrect instructions. This 1244 workaround disables the loop buffer to avoid the erratum. 1245 1246endmenu 1247 1248source "arch/arm/common/Kconfig" 1249 1250menu "Bus support" 1251 1252config ISA 1253 bool 1254 help 1255 Find out whether you have ISA slots on your motherboard. ISA is the 1256 name of a bus system, i.e. the way the CPU talks to the other stuff 1257 inside your box. Other bus systems are PCI, EISA, MicroChannel 1258 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1259 newer boards don't support it. If you have ISA, say Y, otherwise N. 1260 1261# Select ISA DMA controller support 1262config ISA_DMA 1263 bool 1264 select ISA_DMA_API 1265 1266# Select ISA DMA interface 1267config ISA_DMA_API 1268 bool 1269 1270config PCI 1271 bool "PCI support" if MIGHT_HAVE_PCI 1272 help 1273 Find out whether you have a PCI motherboard. PCI is the name of a 1274 bus system, i.e. the way the CPU talks to the other stuff inside 1275 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1276 VESA. If you have PCI, say Y, otherwise N. 1277 1278config PCI_DOMAINS 1279 bool 1280 depends on PCI 1281 1282config PCI_NANOENGINE 1283 bool "BSE nanoEngine PCI support" 1284 depends on SA1100_NANOENGINE 1285 help 1286 Enable PCI on the BSE nanoEngine board. 1287 1288config PCI_SYSCALL 1289 def_bool PCI 1290 1291config PCI_HOST_ITE8152 1292 bool 1293 depends on PCI && MACH_ARMCORE 1294 default y 1295 select DMABOUNCE 1296 1297source "drivers/pci/Kconfig" 1298source "drivers/pci/pcie/Kconfig" 1299 1300source "drivers/pcmcia/Kconfig" 1301 1302endmenu 1303 1304menu "Kernel Features" 1305 1306config HAVE_SMP 1307 bool 1308 help 1309 This option should be selected by machines which have an SMP- 1310 capable CPU. 1311 1312 The only effect of this option is to make the SMP-related 1313 options available to the user for configuration. 1314 1315config SMP 1316 bool "Symmetric Multi-Processing" 1317 depends on CPU_V6K || CPU_V7 1318 depends on GENERIC_CLOCKEVENTS 1319 depends on HAVE_SMP 1320 depends on MMU || ARM_MPU 1321 help 1322 This enables support for systems with more than one CPU. If you have 1323 a system with only one CPU, say N. If you have a system with more 1324 than one CPU, say Y. 1325 1326 If you say N here, the kernel will run on uni- and multiprocessor 1327 machines, but will use only one CPU of a multiprocessor machine. If 1328 you say Y here, the kernel will run on many, but not all, 1329 uniprocessor machines. On a uniprocessor machine, the kernel 1330 will run faster if you say N here. 1331 1332 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1333 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1334 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1335 1336 If you don't know what to do here, say N. 1337 1338config SMP_ON_UP 1339 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)" 1340 depends on SMP && !XIP_KERNEL && MMU 1341 default y 1342 help 1343 SMP kernels contain instructions which fail on non-SMP processors. 1344 Enabling this option allows the kernel to modify itself to make 1345 these instructions safe. Disabling it allows about 1K of space 1346 savings. 1347 1348 If you don't know what to do here, say Y. 1349 1350config ARM_CPU_TOPOLOGY 1351 bool "Support cpu topology definition" 1352 depends on SMP && CPU_V7 1353 default y 1354 help 1355 Support ARM cpu topology definition. The MPIDR register defines 1356 affinity between processors which is then used to describe the cpu 1357 topology of an ARM System. 1358 1359config SCHED_MC 1360 bool "Multi-core scheduler support" 1361 depends on ARM_CPU_TOPOLOGY 1362 help 1363 Multi-core scheduler support improves the CPU scheduler's decision 1364 making when dealing with multi-core CPU chips at a cost of slightly 1365 increased overhead in some places. If unsure say N here. 1366 1367config SCHED_SMT 1368 bool "SMT scheduler support" 1369 depends on ARM_CPU_TOPOLOGY 1370 help 1371 Improves the CPU scheduler's decision making when dealing with 1372 MultiThreading at a cost of slightly increased overhead in some 1373 places. If unsure say N here. 1374 1375config HAVE_ARM_SCU 1376 bool 1377 help 1378 This option enables support for the ARM system coherency unit 1379 1380config HAVE_ARM_ARCH_TIMER 1381 bool "Architected timer support" 1382 depends on CPU_V7 1383 select ARM_ARCH_TIMER 1384 select GENERIC_CLOCKEVENTS 1385 help 1386 This option enables support for the ARM architected timer 1387 1388config HAVE_ARM_TWD 1389 bool 1390 depends on SMP 1391 select CLKSRC_OF if OF 1392 help 1393 This options enables support for the ARM timer and watchdog unit 1394 1395config MCPM 1396 bool "Multi-Cluster Power Management" 1397 depends on CPU_V7 && SMP 1398 help 1399 This option provides the common power management infrastructure 1400 for (multi-)cluster based systems, such as big.LITTLE based 1401 systems. 1402 1403config MCPM_QUAD_CLUSTER 1404 bool 1405 depends on MCPM 1406 help 1407 To avoid wasting resources unnecessarily, MCPM only supports up 1408 to 2 clusters by default. 1409 Platforms with 3 or 4 clusters that use MCPM must select this 1410 option to allow the additional clusters to be managed. 1411 1412config BIG_LITTLE 1413 bool "big.LITTLE support (Experimental)" 1414 depends on CPU_V7 && SMP 1415 select MCPM 1416 help 1417 This option enables support selections for the big.LITTLE 1418 system architecture. 1419 1420config BL_SWITCHER 1421 bool "big.LITTLE switcher support" 1422 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU 1423 select ARM_CPU_SUSPEND 1424 select CPU_PM 1425 help 1426 The big.LITTLE "switcher" provides the core functionality to 1427 transparently handle transition between a cluster of A15's 1428 and a cluster of A7's in a big.LITTLE system. 1429 1430config BL_SWITCHER_DUMMY_IF 1431 tristate "Simple big.LITTLE switcher user interface" 1432 depends on BL_SWITCHER && DEBUG_KERNEL 1433 help 1434 This is a simple and dummy char dev interface to control 1435 the big.LITTLE switcher core code. It is meant for 1436 debugging purposes only. 1437 1438choice 1439 prompt "Memory split" 1440 depends on MMU 1441 default VMSPLIT_3G 1442 help 1443 Select the desired split between kernel and user memory. 1444 1445 If you are not absolutely sure what you are doing, leave this 1446 option alone! 1447 1448 config VMSPLIT_3G 1449 bool "3G/1G user/kernel split" 1450 config VMSPLIT_2G 1451 bool "2G/2G user/kernel split" 1452 config VMSPLIT_1G 1453 bool "1G/3G user/kernel split" 1454endchoice 1455 1456config PAGE_OFFSET 1457 hex 1458 default PHYS_OFFSET if !MMU 1459 default 0x40000000 if VMSPLIT_1G 1460 default 0x80000000 if VMSPLIT_2G 1461 default 0xC0000000 1462 1463config NR_CPUS 1464 int "Maximum number of CPUs (2-32)" 1465 range 2 32 1466 depends on SMP 1467 default "4" 1468 1469config HOTPLUG_CPU 1470 bool "Support for hot-pluggable CPUs" 1471 depends on SMP 1472 help 1473 Say Y here to experiment with turning CPUs off and on. CPUs 1474 can be controlled through /sys/devices/system/cpu. 1475 1476config ARM_PSCI 1477 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1478 depends on CPU_V7 1479 help 1480 Say Y here if you want Linux to communicate with system firmware 1481 implementing the PSCI specification for CPU-centric power 1482 management operations described in ARM document number ARM DEN 1483 0022A ("Power State Coordination Interface System Software on 1484 ARM processors"). 1485 1486# The GPIO number here must be sorted by descending number. In case of 1487# a multiplatform kernel, we just want the highest value required by the 1488# selected platforms. 1489config ARCH_NR_GPIO 1490 int 1491 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA 1492 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ 1493 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 1494 default 416 if ARCH_SUNXI 1495 default 392 if ARCH_U8500 1496 default 352 if ARCH_VT8500 1497 default 288 if ARCH_ROCKCHIP 1498 default 264 if MACH_H4700 1499 default 0 1500 help 1501 Maximum number of GPIOs in the system. 1502 1503 If unsure, leave the default value. 1504 1505source kernel/Kconfig.preempt 1506 1507config HZ_FIXED 1508 int 1509 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ 1510 ARCH_S5PV210 || ARCH_EXYNOS4 1511 default AT91_TIMER_HZ if ARCH_AT91 1512 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY 1513 default 0 1514 1515choice 1516 depends on HZ_FIXED = 0 1517 prompt "Timer frequency" 1518 1519config HZ_100 1520 bool "100 Hz" 1521 1522config HZ_200 1523 bool "200 Hz" 1524 1525config HZ_250 1526 bool "250 Hz" 1527 1528config HZ_300 1529 bool "300 Hz" 1530 1531config HZ_500 1532 bool "500 Hz" 1533 1534config HZ_1000 1535 bool "1000 Hz" 1536 1537endchoice 1538 1539config HZ 1540 int 1541 default HZ_FIXED if HZ_FIXED != 0 1542 default 100 if HZ_100 1543 default 200 if HZ_200 1544 default 250 if HZ_250 1545 default 300 if HZ_300 1546 default 500 if HZ_500 1547 default 1000 1548 1549config SCHED_HRTICK 1550 def_bool HIGH_RES_TIMERS 1551 1552config THUMB2_KERNEL 1553 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1554 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1555 default y if CPU_THUMBONLY 1556 select AEABI 1557 select ARM_ASM_UNIFIED 1558 select ARM_UNWIND 1559 help 1560 By enabling this option, the kernel will be compiled in 1561 Thumb-2 mode. A compiler/assembler that understand the unified 1562 ARM-Thumb syntax is needed. 1563 1564 If unsure, say N. 1565 1566config THUMB2_AVOID_R_ARM_THM_JUMP11 1567 bool "Work around buggy Thumb-2 short branch relocations in gas" 1568 depends on THUMB2_KERNEL && MODULES 1569 default y 1570 help 1571 Various binutils versions can resolve Thumb-2 branches to 1572 locally-defined, preemptible global symbols as short-range "b.n" 1573 branch instructions. 1574 1575 This is a problem, because there's no guarantee the final 1576 destination of the symbol, or any candidate locations for a 1577 trampoline, are within range of the branch. For this reason, the 1578 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1579 relocation in modules at all, and it makes little sense to add 1580 support. 1581 1582 The symptom is that the kernel fails with an "unsupported 1583 relocation" error when loading some modules. 1584 1585 Until fixed tools are available, passing 1586 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1587 code which hits this problem, at the cost of a bit of extra runtime 1588 stack usage in some cases. 1589 1590 The problem is described in more detail at: 1591 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1592 1593 Only Thumb-2 kernels are affected. 1594 1595 Unless you are sure your tools don't have this problem, say Y. 1596 1597config ARM_ASM_UNIFIED 1598 bool 1599 1600config AEABI 1601 bool "Use the ARM EABI to compile the kernel" 1602 help 1603 This option allows for the kernel to be compiled using the latest 1604 ARM ABI (aka EABI). This is only useful if you are using a user 1605 space environment that is also compiled with EABI. 1606 1607 Since there are major incompatibilities between the legacy ABI and 1608 EABI, especially with regard to structure member alignment, this 1609 option also changes the kernel syscall calling convention to 1610 disambiguate both ABIs and allow for backward compatibility support 1611 (selected with CONFIG_OABI_COMPAT). 1612 1613 To use this you need GCC version 4.0.0 or later. 1614 1615config OABI_COMPAT 1616 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1617 depends on AEABI && !THUMB2_KERNEL 1618 help 1619 This option preserves the old syscall interface along with the 1620 new (ARM EABI) one. It also provides a compatibility layer to 1621 intercept syscalls that have structure arguments which layout 1622 in memory differs between the legacy ABI and the new ARM EABI 1623 (only for non "thumb" binaries). This option adds a tiny 1624 overhead to all syscalls and produces a slightly larger kernel. 1625 1626 The seccomp filter system will not be available when this is 1627 selected, since there is no way yet to sensibly distinguish 1628 between calling conventions during filtering. 1629 1630 If you know you'll be using only pure EABI user space then you 1631 can say N here. If this option is not selected and you attempt 1632 to execute a legacy ABI binary then the result will be 1633 UNPREDICTABLE (in fact it can be predicted that it won't work 1634 at all). If in doubt say N. 1635 1636config ARCH_HAS_HOLES_MEMORYMODEL 1637 bool 1638 1639config ARCH_SPARSEMEM_ENABLE 1640 bool 1641 1642config ARCH_SPARSEMEM_DEFAULT 1643 def_bool ARCH_SPARSEMEM_ENABLE 1644 1645config ARCH_SELECT_MEMORY_MODEL 1646 def_bool ARCH_SPARSEMEM_ENABLE 1647 1648config HAVE_ARCH_PFN_VALID 1649 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1650 1651config HAVE_GENERIC_RCU_GUP 1652 def_bool y 1653 depends on ARM_LPAE 1654 1655config HIGHMEM 1656 bool "High Memory Support" 1657 depends on MMU 1658 help 1659 The address space of ARM processors is only 4 Gigabytes large 1660 and it has to accommodate user address space, kernel address 1661 space as well as some memory mapped IO. That means that, if you 1662 have a large amount of physical memory and/or IO, not all of the 1663 memory can be "permanently mapped" by the kernel. The physical 1664 memory that is not permanently mapped is called "high memory". 1665 1666 Depending on the selected kernel/user memory split, minimum 1667 vmalloc space and actual amount of RAM, you may not need this 1668 option which should result in a slightly faster kernel. 1669 1670 If unsure, say n. 1671 1672config HIGHPTE 1673 bool "Allocate 2nd-level pagetables from highmem" 1674 depends on HIGHMEM 1675 1676config HW_PERF_EVENTS 1677 bool "Enable hardware performance counter support for perf events" 1678 depends on PERF_EVENTS 1679 default y 1680 help 1681 Enable hardware performance counter support for perf events. If 1682 disabled, perf events will use software events only. 1683 1684config SYS_SUPPORTS_HUGETLBFS 1685 def_bool y 1686 depends on ARM_LPAE 1687 1688config HAVE_ARCH_TRANSPARENT_HUGEPAGE 1689 def_bool y 1690 depends on ARM_LPAE 1691 1692config ARCH_WANT_GENERAL_HUGETLB 1693 def_bool y 1694 1695source "mm/Kconfig" 1696 1697config FORCE_MAX_ZONEORDER 1698 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY 1699 range 11 64 if ARCH_SHMOBILE_LEGACY 1700 default "12" if SOC_AM33XX 1701 default "9" if SA1111 || ARCH_EFM32 1702 default "11" 1703 help 1704 The kernel memory allocator divides physically contiguous memory 1705 blocks into "zones", where each zone is a power of two number of 1706 pages. This option selects the largest power of two that the kernel 1707 keeps in the memory allocator. If you need to allocate very large 1708 blocks of physically contiguous memory, then you may need to 1709 increase this value. 1710 1711 This config option is actually maximum order plus one. For example, 1712 a value of 11 means that the largest free memory block is 2^10 pages. 1713 1714config ALIGNMENT_TRAP 1715 bool 1716 depends on CPU_CP15_MMU 1717 default y if !ARCH_EBSA110 1718 select HAVE_PROC_CPU if PROC_FS 1719 help 1720 ARM processors cannot fetch/store information which is not 1721 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1722 address divisible by 4. On 32-bit ARM processors, these non-aligned 1723 fetch/store instructions will be emulated in software if you say 1724 here, which has a severe performance impact. This is necessary for 1725 correct operation of some network protocols. With an IP-only 1726 configuration it is safe to say N, otherwise say Y. 1727 1728config UACCESS_WITH_MEMCPY 1729 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1730 depends on MMU 1731 default y if CPU_FEROCEON 1732 help 1733 Implement faster copy_to_user and clear_user methods for CPU 1734 cores where a 8-word STM instruction give significantly higher 1735 memory write throughput than a sequence of individual 32bit stores. 1736 1737 A possible side effect is a slight increase in scheduling latency 1738 between threads sharing the same address space if they invoke 1739 such copy operations with large buffers. 1740 1741 However, if the CPU data cache is using a write-allocate mode, 1742 this option is unlikely to provide any performance gain. 1743 1744config SECCOMP 1745 bool 1746 prompt "Enable seccomp to safely compute untrusted bytecode" 1747 ---help--- 1748 This kernel feature is useful for number crunching applications 1749 that may need to compute untrusted bytecode during their 1750 execution. By using pipes or other transports made available to 1751 the process as file descriptors supporting the read/write 1752 syscalls, it's possible to isolate those applications in 1753 their own address space using seccomp. Once seccomp is 1754 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1755 and the task is only allowed to execute a few safe syscalls 1756 defined by each seccomp mode. 1757 1758config SWIOTLB 1759 def_bool y 1760 1761config IOMMU_HELPER 1762 def_bool SWIOTLB 1763 1764config XEN_DOM0 1765 def_bool y 1766 depends on XEN 1767 1768config XEN 1769 bool "Xen guest support on ARM" 1770 depends on ARM && AEABI && OF 1771 depends on CPU_V7 && !CPU_V6 1772 depends on !GENERIC_ATOMIC64 1773 depends on MMU 1774 select ARCH_DMA_ADDR_T_64BIT 1775 select ARM_PSCI 1776 select SWIOTLB_XEN 1777 help 1778 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1779 1780endmenu 1781 1782menu "Boot options" 1783 1784config USE_OF 1785 bool "Flattened Device Tree support" 1786 select IRQ_DOMAIN 1787 select OF 1788 select OF_EARLY_FLATTREE 1789 select OF_RESERVED_MEM 1790 help 1791 Include support for flattened device tree machine descriptions. 1792 1793config ATAGS 1794 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1795 default y 1796 help 1797 This is the traditional way of passing data to the kernel at boot 1798 time. If you are solely relying on the flattened device tree (or 1799 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1800 to remove ATAGS support from your kernel binary. If unsure, 1801 leave this to y. 1802 1803config DEPRECATED_PARAM_STRUCT 1804 bool "Provide old way to pass kernel parameters" 1805 depends on ATAGS 1806 help 1807 This was deprecated in 2001 and announced to live on for 5 years. 1808 Some old boot loaders still use this way. 1809 1810# Compressed boot loader in ROM. Yes, we really want to ask about 1811# TEXT and BSS so we preserve their values in the config files. 1812config ZBOOT_ROM_TEXT 1813 hex "Compressed ROM boot loader base address" 1814 default "0" 1815 help 1816 The physical address at which the ROM-able zImage is to be 1817 placed in the target. Platforms which normally make use of 1818 ROM-able zImage formats normally set this to a suitable 1819 value in their defconfig file. 1820 1821 If ZBOOT_ROM is not enabled, this has no effect. 1822 1823config ZBOOT_ROM_BSS 1824 hex "Compressed ROM boot loader BSS address" 1825 default "0" 1826 help 1827 The base address of an area of read/write memory in the target 1828 for the ROM-able zImage which must be available while the 1829 decompressor is running. It must be large enough to hold the 1830 entire decompressed kernel plus an additional 128 KiB. 1831 Platforms which normally make use of ROM-able zImage formats 1832 normally set this to a suitable value in their defconfig file. 1833 1834 If ZBOOT_ROM is not enabled, this has no effect. 1835 1836config ZBOOT_ROM 1837 bool "Compressed boot loader in ROM/flash" 1838 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1839 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1840 help 1841 Say Y here if you intend to execute your compressed kernel image 1842 (zImage) directly from ROM or flash. If unsure, say N. 1843 1844choice 1845 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)" 1846 depends on ZBOOT_ROM && ARCH_SH7372 1847 default ZBOOT_ROM_NONE 1848 help 1849 Include experimental SD/MMC loading code in the ROM-able zImage. 1850 With this enabled it is possible to write the ROM-able zImage 1851 kernel image to an MMC or SD card and boot the kernel straight 1852 from the reset vector. At reset the processor Mask ROM will load 1853 the first part of the ROM-able zImage which in turn loads the 1854 rest the kernel image to RAM. 1855 1856config ZBOOT_ROM_NONE 1857 bool "No SD/MMC loader in zImage (EXPERIMENTAL)" 1858 help 1859 Do not load image from SD or MMC 1860 1861config ZBOOT_ROM_MMCIF 1862 bool "Include MMCIF loader in zImage (EXPERIMENTAL)" 1863 help 1864 Load image from MMCIF hardware block. 1865 1866config ZBOOT_ROM_SH_MOBILE_SDHI 1867 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)" 1868 help 1869 Load image from SDHI hardware block 1870 1871endchoice 1872 1873config ARM_APPENDED_DTB 1874 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1875 depends on OF 1876 help 1877 With this option, the boot code will look for a device tree binary 1878 (DTB) appended to zImage 1879 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1880 1881 This is meant as a backward compatibility convenience for those 1882 systems with a bootloader that can't be upgraded to accommodate 1883 the documented boot protocol using a device tree. 1884 1885 Beware that there is very little in terms of protection against 1886 this option being confused by leftover garbage in memory that might 1887 look like a DTB header after a reboot if no actual DTB is appended 1888 to zImage. Do not leave this option active in a production kernel 1889 if you don't intend to always append a DTB. Proper passing of the 1890 location into r2 of a bootloader provided DTB is always preferable 1891 to this option. 1892 1893config ARM_ATAG_DTB_COMPAT 1894 bool "Supplement the appended DTB with traditional ATAG information" 1895 depends on ARM_APPENDED_DTB 1896 help 1897 Some old bootloaders can't be updated to a DTB capable one, yet 1898 they provide ATAGs with memory configuration, the ramdisk address, 1899 the kernel cmdline string, etc. Such information is dynamically 1900 provided by the bootloader and can't always be stored in a static 1901 DTB. To allow a device tree enabled kernel to be used with such 1902 bootloaders, this option allows zImage to extract the information 1903 from the ATAG list and store it at run time into the appended DTB. 1904 1905choice 1906 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1907 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1908 1909config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1910 bool "Use bootloader kernel arguments if available" 1911 help 1912 Uses the command-line options passed by the boot loader instead of 1913 the device tree bootargs property. If the boot loader doesn't provide 1914 any, the device tree bootargs property will be used. 1915 1916config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1917 bool "Extend with bootloader kernel arguments" 1918 help 1919 The command-line arguments provided by the boot loader will be 1920 appended to the the device tree bootargs property. 1921 1922endchoice 1923 1924config CMDLINE 1925 string "Default kernel command string" 1926 default "" 1927 help 1928 On some architectures (EBSA110 and CATS), there is currently no way 1929 for the boot loader to pass arguments to the kernel. For these 1930 architectures, you should supply some command-line options at build 1931 time by entering them here. As a minimum, you should specify the 1932 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1933 1934choice 1935 prompt "Kernel command line type" if CMDLINE != "" 1936 default CMDLINE_FROM_BOOTLOADER 1937 depends on ATAGS 1938 1939config CMDLINE_FROM_BOOTLOADER 1940 bool "Use bootloader kernel arguments if available" 1941 help 1942 Uses the command-line options passed by the boot loader. If 1943 the boot loader doesn't provide any, the default kernel command 1944 string provided in CMDLINE will be used. 1945 1946config CMDLINE_EXTEND 1947 bool "Extend bootloader kernel arguments" 1948 help 1949 The command-line arguments provided by the boot loader will be 1950 appended to the default kernel command string. 1951 1952config CMDLINE_FORCE 1953 bool "Always use the default kernel command string" 1954 help 1955 Always use the default kernel command string, even if the boot 1956 loader passes other arguments to the kernel. 1957 This is useful if you cannot or don't want to change the 1958 command-line options your boot loader passes to the kernel. 1959endchoice 1960 1961config XIP_KERNEL 1962 bool "Kernel Execute-In-Place from ROM" 1963 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1964 help 1965 Execute-In-Place allows the kernel to run from non-volatile storage 1966 directly addressable by the CPU, such as NOR flash. This saves RAM 1967 space since the text section of the kernel is not loaded from flash 1968 to RAM. Read-write sections, such as the data section and stack, 1969 are still copied to RAM. The XIP kernel is not compressed since 1970 it has to run directly from flash, so it will take more space to 1971 store it. The flash address used to link the kernel object files, 1972 and for storing it, is configuration dependent. Therefore, if you 1973 say Y here, you must know the proper physical address where to 1974 store the kernel image depending on your own flash memory usage. 1975 1976 Also note that the make target becomes "make xipImage" rather than 1977 "make zImage" or "make Image". The final kernel binary to put in 1978 ROM memory will be arch/arm/boot/xipImage. 1979 1980 If unsure, say N. 1981 1982config XIP_PHYS_ADDR 1983 hex "XIP Kernel Physical Location" 1984 depends on XIP_KERNEL 1985 default "0x00080000" 1986 help 1987 This is the physical address in your flash memory the kernel will 1988 be linked for and stored to. This address is dependent on your 1989 own flash usage. 1990 1991config KEXEC 1992 bool "Kexec system call (EXPERIMENTAL)" 1993 depends on (!SMP || PM_SLEEP_SMP) 1994 help 1995 kexec is a system call that implements the ability to shutdown your 1996 current kernel, and to start another kernel. It is like a reboot 1997 but it is independent of the system firmware. And like a reboot 1998 you can start any kernel with it, not just Linux. 1999 2000 It is an ongoing process to be certain the hardware in a machine 2001 is properly shutdown, so do not be surprised if this code does not 2002 initially work for you. 2003 2004config ATAGS_PROC 2005 bool "Export atags in procfs" 2006 depends on ATAGS && KEXEC 2007 default y 2008 help 2009 Should the atags used to boot the kernel be exported in an "atags" 2010 file in procfs. Useful with kexec. 2011 2012config CRASH_DUMP 2013 bool "Build kdump crash kernel (EXPERIMENTAL)" 2014 help 2015 Generate crash dump after being started by kexec. This should 2016 be normally only set in special crash dump kernels which are 2017 loaded in the main kernel with kexec-tools into a specially 2018 reserved region and then later executed after a crash by 2019 kdump/kexec. The crash dump kernel must be compiled to a 2020 memory address not used by the main kernel 2021 2022 For more details see Documentation/kdump/kdump.txt 2023 2024config AUTO_ZRELADDR 2025 bool "Auto calculation of the decompressed kernel image address" 2026 help 2027 ZRELADDR is the physical address where the decompressed kernel 2028 image will be placed. If AUTO_ZRELADDR is selected, the address 2029 will be determined at run-time by masking the current IP with 2030 0xf8000000. This assumes the zImage being placed in the first 128MB 2031 from start of memory. 2032 2033endmenu 2034 2035menu "CPU Power Management" 2036 2037source "drivers/cpufreq/Kconfig" 2038 2039source "drivers/cpuidle/Kconfig" 2040 2041endmenu 2042 2043menu "Floating point emulation" 2044 2045comment "At least one emulation must be selected" 2046 2047config FPE_NWFPE 2048 bool "NWFPE math emulation" 2049 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2050 ---help--- 2051 Say Y to include the NWFPE floating point emulator in the kernel. 2052 This is necessary to run most binaries. Linux does not currently 2053 support floating point hardware so you need to say Y here even if 2054 your machine has an FPA or floating point co-processor podule. 2055 2056 You may say N here if you are going to load the Acorn FPEmulator 2057 early in the bootup. 2058 2059config FPE_NWFPE_XP 2060 bool "Support extended precision" 2061 depends on FPE_NWFPE 2062 help 2063 Say Y to include 80-bit support in the kernel floating-point 2064 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2065 Note that gcc does not generate 80-bit operations by default, 2066 so in most cases this option only enlarges the size of the 2067 floating point emulator without any good reason. 2068 2069 You almost surely want to say N here. 2070 2071config FPE_FASTFPE 2072 bool "FastFPE math emulation (EXPERIMENTAL)" 2073 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2074 ---help--- 2075 Say Y here to include the FAST floating point emulator in the kernel. 2076 This is an experimental much faster emulator which now also has full 2077 precision for the mantissa. It does not support any exceptions. 2078 It is very simple, and approximately 3-6 times faster than NWFPE. 2079 2080 It should be sufficient for most programs. It may be not suitable 2081 for scientific calculations, but you have to check this for yourself. 2082 If you do not feel you need a faster FP emulation you should better 2083 choose NWFPE. 2084 2085config VFP 2086 bool "VFP-format floating point maths" 2087 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2088 help 2089 Say Y to include VFP support code in the kernel. This is needed 2090 if your hardware includes a VFP unit. 2091 2092 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2093 release notes and additional status information. 2094 2095 Say N if your target does not have VFP hardware. 2096 2097config VFPv3 2098 bool 2099 depends on VFP 2100 default y if CPU_V7 2101 2102config NEON 2103 bool "Advanced SIMD (NEON) Extension support" 2104 depends on VFPv3 && CPU_V7 2105 help 2106 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2107 Extension. 2108 2109config KERNEL_MODE_NEON 2110 bool "Support for NEON in kernel mode" 2111 depends on NEON && AEABI 2112 help 2113 Say Y to include support for NEON in kernel mode. 2114 2115endmenu 2116 2117menu "Userspace binary formats" 2118 2119source "fs/Kconfig.binfmt" 2120 2121config ARTHUR 2122 tristate "RISC OS personality" 2123 depends on !AEABI 2124 help 2125 Say Y here to include the kernel code necessary if you want to run 2126 Acorn RISC OS/Arthur binaries under Linux. This code is still very 2127 experimental; if this sounds frightening, say N and sleep in peace. 2128 You can also say M here to compile this support as a module (which 2129 will be called arthur). 2130 2131endmenu 2132 2133menu "Power management options" 2134 2135source "kernel/power/Kconfig" 2136 2137config ARCH_SUSPEND_POSSIBLE 2138 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 2139 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2140 def_bool y 2141 2142config ARM_CPU_SUSPEND 2143 def_bool PM_SLEEP 2144 2145config ARCH_HIBERNATION_POSSIBLE 2146 bool 2147 depends on MMU 2148 default y if ARCH_SUSPEND_POSSIBLE 2149 2150endmenu 2151 2152source "net/Kconfig" 2153 2154source "drivers/Kconfig" 2155 2156source "fs/Kconfig" 2157 2158source "arch/arm/Kconfig.debug" 2159 2160source "security/Kconfig" 2161 2162source "crypto/Kconfig" 2163 2164source "lib/Kconfig" 2165 2166source "arch/arm/kvm/Kconfig" 2167