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_MIGHT_HAVE_PC_PARPORT 9 select ARCH_SUPPORTS_ATOMIC_RMW 10 select ARCH_USE_BUILTIN_BSWAP 11 select ARCH_USE_CMPXCHG_LOCKREF 12 select ARCH_WANT_IPC_PARSE_VERSION 13 select BUILDTIME_EXTABLE_SORT if MMU 14 select CLONE_BACKWARDS 15 select CPU_PM if (SUSPEND || CPU_IDLE) 16 select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS 17 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI) 18 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 19 select GENERIC_IDLE_POLL_SETUP 20 select GENERIC_IRQ_PROBE 21 select GENERIC_IRQ_SHOW 22 select GENERIC_PCI_IOMAP 23 select GENERIC_SCHED_CLOCK 24 select GENERIC_SMP_IDLE_THREAD 25 select GENERIC_STRNCPY_FROM_USER 26 select GENERIC_STRNLEN_USER 27 select HARDIRQS_SW_RESEND 28 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT) 29 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 30 select HAVE_ARCH_KGDB 31 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) 32 select HAVE_ARCH_TRACEHOOK 33 select HAVE_BPF_JIT 34 select HAVE_CC_STACKPROTECTOR 35 select HAVE_CONTEXT_TRACKING 36 select HAVE_C_RECORDMCOUNT 37 select HAVE_DEBUG_KMEMLEAK 38 select HAVE_DMA_API_DEBUG 39 select HAVE_DMA_ATTRS 40 select HAVE_DMA_CONTIGUOUS if MMU 41 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) 42 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU 43 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL) 44 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL) 45 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL) 46 select HAVE_GENERIC_DMA_COHERENT 47 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)) 48 select HAVE_IDE if PCI || ISA || PCMCIA 49 select HAVE_IRQ_TIME_ACCOUNTING 50 select HAVE_KERNEL_GZIP 51 select HAVE_KERNEL_LZ4 52 select HAVE_KERNEL_LZMA 53 select HAVE_KERNEL_LZO 54 select HAVE_KERNEL_XZ 55 select HAVE_KPROBES if !XIP_KERNEL 56 select HAVE_KRETPROBES if (HAVE_KPROBES) 57 select HAVE_MEMBLOCK 58 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND 59 select HAVE_OPROFILE if (HAVE_PERF_EVENTS) 60 select HAVE_PERF_EVENTS 61 select HAVE_PERF_REGS 62 select HAVE_PERF_USER_STACK_DUMP 63 select HAVE_REGS_AND_STACK_ACCESS_API 64 select HAVE_SYSCALL_TRACEPOINTS 65 select HAVE_UID16 66 select HAVE_VIRT_CPU_ACCOUNTING_GEN 67 select IRQ_FORCED_THREADING 68 select MODULES_USE_ELF_REL 69 select NO_BOOTMEM 70 select OLD_SIGACTION 71 select OLD_SIGSUSPEND3 72 select PERF_USE_VMALLOC 73 select RTC_LIB 74 select SYS_SUPPORTS_APM_EMULATION 75 # Above selects are sorted alphabetically; please add new ones 76 # according to that. Thanks. 77 help 78 The ARM series is a line of low-power-consumption RISC chip designs 79 licensed by ARM Ltd and targeted at embedded applications and 80 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 81 manufactured, but legacy ARM-based PC hardware remains popular in 82 Europe. There is an ARM Linux project with a web page at 83 <http://www.arm.linux.org.uk/>. 84 85config ARM_HAS_SG_CHAIN 86 select ARCH_HAS_SG_CHAIN 87 bool 88 89config NEED_SG_DMA_LENGTH 90 bool 91 92config ARM_DMA_USE_IOMMU 93 bool 94 select ARM_HAS_SG_CHAIN 95 select NEED_SG_DMA_LENGTH 96 97if ARM_DMA_USE_IOMMU 98 99config ARM_DMA_IOMMU_ALIGNMENT 100 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" 101 range 4 9 102 default 8 103 help 104 DMA mapping framework by default aligns all buffers to the smallest 105 PAGE_SIZE order which is greater than or equal to the requested buffer 106 size. This works well for buffers up to a few hundreds kilobytes, but 107 for larger buffers it just a waste of address space. Drivers which has 108 relatively small addressing window (like 64Mib) might run out of 109 virtual space with just a few allocations. 110 111 With this parameter you can specify the maximum PAGE_SIZE order for 112 DMA IOMMU buffers. Larger buffers will be aligned only to this 113 specified order. The order is expressed as a power of two multiplied 114 by the PAGE_SIZE. 115 116endif 117 118config MIGHT_HAVE_PCI 119 bool 120 121config SYS_SUPPORTS_APM_EMULATION 122 bool 123 124config HAVE_TCM 125 bool 126 select GENERIC_ALLOCATOR 127 128config HAVE_PROC_CPU 129 bool 130 131config NO_IOPORT_MAP 132 bool 133 134config EISA 135 bool 136 ---help--- 137 The Extended Industry Standard Architecture (EISA) bus was 138 developed as an open alternative to the IBM MicroChannel bus. 139 140 The EISA bus provided some of the features of the IBM MicroChannel 141 bus while maintaining backward compatibility with cards made for 142 the older ISA bus. The EISA bus saw limited use between 1988 and 143 1995 when it was made obsolete by the PCI bus. 144 145 Say Y here if you are building a kernel for an EISA-based machine. 146 147 Otherwise, say N. 148 149config SBUS 150 bool 151 152config STACKTRACE_SUPPORT 153 bool 154 default y 155 156config HAVE_LATENCYTOP_SUPPORT 157 bool 158 depends on !SMP 159 default y 160 161config LOCKDEP_SUPPORT 162 bool 163 default y 164 165config TRACE_IRQFLAGS_SUPPORT 166 bool 167 default y 168 169config RWSEM_XCHGADD_ALGORITHM 170 bool 171 default y 172 173config ARCH_HAS_ILOG2_U32 174 bool 175 176config ARCH_HAS_ILOG2_U64 177 bool 178 179config ARCH_HAS_BANDGAP 180 bool 181 182config GENERIC_HWEIGHT 183 bool 184 default y 185 186config GENERIC_CALIBRATE_DELAY 187 bool 188 default y 189 190config ARCH_MAY_HAVE_PC_FDC 191 bool 192 193config ZONE_DMA 194 bool 195 196config NEED_DMA_MAP_STATE 197 def_bool y 198 199config ARCH_SUPPORTS_UPROBES 200 def_bool y 201 202config ARCH_HAS_DMA_SET_COHERENT_MASK 203 bool 204 205config GENERIC_ISA_DMA 206 bool 207 208config FIQ 209 bool 210 211config NEED_RET_TO_USER 212 bool 213 214config ARCH_MTD_XIP 215 bool 216 217config VECTORS_BASE 218 hex 219 default 0xffff0000 if MMU || CPU_HIGH_VECTOR 220 default DRAM_BASE if REMAP_VECTORS_TO_RAM 221 default 0x00000000 222 help 223 The base address of exception vectors. This must be two pages 224 in size. 225 226config ARM_PATCH_PHYS_VIRT 227 bool "Patch physical to virtual translations at runtime" if EMBEDDED 228 default y 229 depends on !XIP_KERNEL && MMU 230 depends on !ARCH_REALVIEW || !SPARSEMEM 231 help 232 Patch phys-to-virt and virt-to-phys translation functions at 233 boot and module load time according to the position of the 234 kernel in system memory. 235 236 This can only be used with non-XIP MMU kernels where the base 237 of physical memory is at a 16MB boundary. 238 239 Only disable this option if you know that you do not require 240 this feature (eg, building a kernel for a single machine) and 241 you need to shrink the kernel to the minimal size. 242 243config NEED_MACH_IO_H 244 bool 245 help 246 Select this when mach/io.h is required to provide special 247 definitions for this platform. The need for mach/io.h should 248 be avoided when possible. 249 250config NEED_MACH_MEMORY_H 251 bool 252 help 253 Select this when mach/memory.h is required to provide special 254 definitions for this platform. The need for mach/memory.h should 255 be avoided when possible. 256 257config PHYS_OFFSET 258 hex "Physical address of main memory" if MMU 259 depends on !ARM_PATCH_PHYS_VIRT 260 default DRAM_BASE if !MMU 261 default 0x00000000 if ARCH_EBSA110 || \ 262 EP93XX_SDCE3_SYNC_PHYS_OFFSET || \ 263 ARCH_FOOTBRIDGE || \ 264 ARCH_INTEGRATOR || \ 265 ARCH_IOP13XX || \ 266 ARCH_KS8695 || \ 267 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET) 268 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC 269 default 0x20000000 if ARCH_S5PV210 270 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET 271 default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100 272 default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET 273 default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET 274 default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET 275 help 276 Please provide the physical address corresponding to the 277 location of main memory in your system. 278 279config GENERIC_BUG 280 def_bool y 281 depends on BUG 282 283source "init/Kconfig" 284 285source "kernel/Kconfig.freezer" 286 287menu "System Type" 288 289config MMU 290 bool "MMU-based Paged Memory Management Support" 291 default y 292 help 293 Select if you want MMU-based virtualised addressing space 294 support by paged memory management. If unsure, say 'Y'. 295 296# 297# The "ARM system type" choice list is ordered alphabetically by option 298# text. Please add new entries in the option alphabetic order. 299# 300choice 301 prompt "ARM system type" 302 default ARCH_VERSATILE if !MMU 303 default ARCH_MULTIPLATFORM if MMU 304 305config ARCH_MULTIPLATFORM 306 bool "Allow multiple platforms to be selected" 307 depends on MMU 308 select ARCH_WANT_OPTIONAL_GPIOLIB 309 select ARM_HAS_SG_CHAIN 310 select ARM_PATCH_PHYS_VIRT 311 select AUTO_ZRELADDR 312 select CLKSRC_OF 313 select COMMON_CLK 314 select GENERIC_CLOCKEVENTS 315 select MIGHT_HAVE_PCI 316 select MULTI_IRQ_HANDLER 317 select SPARSE_IRQ 318 select USE_OF 319 320config ARCH_INTEGRATOR 321 bool "ARM Ltd. Integrator family" 322 select ARM_AMBA 323 select ARM_PATCH_PHYS_VIRT if MMU 324 select AUTO_ZRELADDR 325 select COMMON_CLK 326 select COMMON_CLK_VERSATILE 327 select GENERIC_CLOCKEVENTS 328 select HAVE_TCM 329 select ICST 330 select MULTI_IRQ_HANDLER 331 select PLAT_VERSATILE 332 select SPARSE_IRQ 333 select USE_OF 334 select VERSATILE_FPGA_IRQ 335 help 336 Support for ARM's Integrator platform. 337 338config ARCH_REALVIEW 339 bool "ARM Ltd. RealView family" 340 select ARCH_WANT_OPTIONAL_GPIOLIB 341 select ARM_AMBA 342 select ARM_TIMER_SP804 343 select COMMON_CLK 344 select COMMON_CLK_VERSATILE 345 select GENERIC_CLOCKEVENTS 346 select GPIO_PL061 if GPIOLIB 347 select ICST 348 select NEED_MACH_MEMORY_H 349 select PLAT_VERSATILE 350 help 351 This enables support for ARM Ltd RealView boards. 352 353config ARCH_VERSATILE 354 bool "ARM Ltd. Versatile family" 355 select ARCH_WANT_OPTIONAL_GPIOLIB 356 select ARM_AMBA 357 select ARM_TIMER_SP804 358 select ARM_VIC 359 select CLKDEV_LOOKUP 360 select GENERIC_CLOCKEVENTS 361 select HAVE_MACH_CLKDEV 362 select ICST 363 select PLAT_VERSATILE 364 select PLAT_VERSATILE_CLOCK 365 select VERSATILE_FPGA_IRQ 366 help 367 This enables support for ARM Ltd Versatile board. 368 369config ARCH_AT91 370 bool "Atmel AT91" 371 select ARCH_REQUIRE_GPIOLIB 372 select CLKDEV_LOOKUP 373 select IRQ_DOMAIN 374 select NEED_MACH_IO_H if PCCARD 375 select PINCTRL 376 select PINCTRL_AT91 if USE_OF 377 help 378 This enables support for systems based on Atmel 379 AT91RM9200 and AT91SAM9* processors. 380 381config ARCH_CLPS711X 382 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based" 383 select ARCH_REQUIRE_GPIOLIB 384 select AUTO_ZRELADDR 385 select CLKSRC_MMIO 386 select COMMON_CLK 387 select CPU_ARM720T 388 select GENERIC_CLOCKEVENTS 389 select MFD_SYSCON 390 select SOC_BUS 391 help 392 Support for Cirrus Logic 711x/721x/731x based boards. 393 394config ARCH_GEMINI 395 bool "Cortina Systems Gemini" 396 select ARCH_REQUIRE_GPIOLIB 397 select CLKSRC_MMIO 398 select CPU_FA526 399 select GENERIC_CLOCKEVENTS 400 help 401 Support for the Cortina Systems Gemini family SoCs 402 403config ARCH_EBSA110 404 bool "EBSA-110" 405 select ARCH_USES_GETTIMEOFFSET 406 select CPU_SA110 407 select ISA 408 select NEED_MACH_IO_H 409 select NEED_MACH_MEMORY_H 410 select NO_IOPORT_MAP 411 help 412 This is an evaluation board for the StrongARM processor available 413 from Digital. It has limited hardware on-board, including an 414 Ethernet interface, two PCMCIA sockets, two serial ports and a 415 parallel port. 416 417config ARCH_EFM32 418 bool "Energy Micro efm32" 419 depends on !MMU 420 select ARCH_REQUIRE_GPIOLIB 421 select ARM_NVIC 422 select AUTO_ZRELADDR 423 select CLKSRC_OF 424 select COMMON_CLK 425 select CPU_V7M 426 select GENERIC_CLOCKEVENTS 427 select NO_DMA 428 select NO_IOPORT_MAP 429 select SPARSE_IRQ 430 select USE_OF 431 help 432 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko 433 processors. 434 435config ARCH_EP93XX 436 bool "EP93xx-based" 437 select ARCH_HAS_HOLES_MEMORYMODEL 438 select ARCH_REQUIRE_GPIOLIB 439 select ARCH_USES_GETTIMEOFFSET 440 select ARM_AMBA 441 select ARM_VIC 442 select CLKDEV_LOOKUP 443 select CPU_ARM920T 444 help 445 This enables support for the Cirrus EP93xx series of CPUs. 446 447config ARCH_FOOTBRIDGE 448 bool "FootBridge" 449 select CPU_SA110 450 select FOOTBRIDGE 451 select GENERIC_CLOCKEVENTS 452 select HAVE_IDE 453 select NEED_MACH_IO_H if !MMU 454 select NEED_MACH_MEMORY_H 455 help 456 Support for systems based on the DC21285 companion chip 457 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 458 459config ARCH_NETX 460 bool "Hilscher NetX based" 461 select ARM_VIC 462 select CLKSRC_MMIO 463 select CPU_ARM926T 464 select GENERIC_CLOCKEVENTS 465 help 466 This enables support for systems based on the Hilscher NetX Soc 467 468config ARCH_IOP13XX 469 bool "IOP13xx-based" 470 depends on MMU 471 select CPU_XSC3 472 select NEED_MACH_MEMORY_H 473 select NEED_RET_TO_USER 474 select PCI 475 select PLAT_IOP 476 select VMSPLIT_1G 477 select SPARSE_IRQ 478 help 479 Support for Intel's IOP13XX (XScale) family of processors. 480 481config ARCH_IOP32X 482 bool "IOP32x-based" 483 depends on MMU 484 select ARCH_REQUIRE_GPIOLIB 485 select CPU_XSCALE 486 select GPIO_IOP 487 select NEED_RET_TO_USER 488 select PCI 489 select PLAT_IOP 490 help 491 Support for Intel's 80219 and IOP32X (XScale) family of 492 processors. 493 494config ARCH_IOP33X 495 bool "IOP33x-based" 496 depends on MMU 497 select ARCH_REQUIRE_GPIOLIB 498 select CPU_XSCALE 499 select GPIO_IOP 500 select NEED_RET_TO_USER 501 select PCI 502 select PLAT_IOP 503 help 504 Support for Intel's IOP33X (XScale) family of processors. 505 506config ARCH_IXP4XX 507 bool "IXP4xx-based" 508 depends on MMU 509 select ARCH_HAS_DMA_SET_COHERENT_MASK 510 select ARCH_REQUIRE_GPIOLIB 511 select ARCH_SUPPORTS_BIG_ENDIAN 512 select CLKSRC_MMIO 513 select CPU_XSCALE 514 select DMABOUNCE if PCI 515 select GENERIC_CLOCKEVENTS 516 select MIGHT_HAVE_PCI 517 select NEED_MACH_IO_H 518 select USB_EHCI_BIG_ENDIAN_DESC 519 select USB_EHCI_BIG_ENDIAN_MMIO 520 help 521 Support for Intel's IXP4XX (XScale) family of processors. 522 523config ARCH_DOVE 524 bool "Marvell Dove" 525 select ARCH_REQUIRE_GPIOLIB 526 select CPU_PJ4 527 select GENERIC_CLOCKEVENTS 528 select MIGHT_HAVE_PCI 529 select MVEBU_MBUS 530 select PINCTRL 531 select PINCTRL_DOVE 532 select PLAT_ORION_LEGACY 533 help 534 Support for the Marvell Dove SoC 88AP510 535 536config ARCH_MV78XX0 537 bool "Marvell MV78xx0" 538 select ARCH_REQUIRE_GPIOLIB 539 select CPU_FEROCEON 540 select GENERIC_CLOCKEVENTS 541 select MVEBU_MBUS 542 select PCI 543 select PLAT_ORION_LEGACY 544 help 545 Support for the following Marvell MV78xx0 series SoCs: 546 MV781x0, MV782x0. 547 548config ARCH_ORION5X 549 bool "Marvell Orion" 550 depends on MMU 551 select ARCH_REQUIRE_GPIOLIB 552 select CPU_FEROCEON 553 select GENERIC_CLOCKEVENTS 554 select MVEBU_MBUS 555 select PCI 556 select PLAT_ORION_LEGACY 557 help 558 Support for the following Marvell Orion 5x series SoCs: 559 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 560 Orion-2 (5281), Orion-1-90 (6183). 561 562config ARCH_MMP 563 bool "Marvell PXA168/910/MMP2" 564 depends on MMU 565 select ARCH_REQUIRE_GPIOLIB 566 select CLKDEV_LOOKUP 567 select GENERIC_ALLOCATOR 568 select GENERIC_CLOCKEVENTS 569 select GPIO_PXA 570 select IRQ_DOMAIN 571 select MULTI_IRQ_HANDLER 572 select PINCTRL 573 select PLAT_PXA 574 select SPARSE_IRQ 575 help 576 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 577 578config ARCH_KS8695 579 bool "Micrel/Kendin KS8695" 580 select ARCH_REQUIRE_GPIOLIB 581 select CLKSRC_MMIO 582 select CPU_ARM922T 583 select GENERIC_CLOCKEVENTS 584 select NEED_MACH_MEMORY_H 585 help 586 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 587 System-on-Chip devices. 588 589config ARCH_W90X900 590 bool "Nuvoton W90X900 CPU" 591 select ARCH_REQUIRE_GPIOLIB 592 select CLKDEV_LOOKUP 593 select CLKSRC_MMIO 594 select CPU_ARM926T 595 select GENERIC_CLOCKEVENTS 596 help 597 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 598 At present, the w90x900 has been renamed nuc900, regarding 599 the ARM series product line, you can login the following 600 link address to know more. 601 602 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 603 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 604 605config ARCH_LPC32XX 606 bool "NXP LPC32XX" 607 select ARCH_REQUIRE_GPIOLIB 608 select ARM_AMBA 609 select CLKDEV_LOOKUP 610 select CLKSRC_MMIO 611 select CPU_ARM926T 612 select GENERIC_CLOCKEVENTS 613 select HAVE_IDE 614 select USE_OF 615 help 616 Support for the NXP LPC32XX family of processors 617 618config ARCH_PXA 619 bool "PXA2xx/PXA3xx-based" 620 depends on MMU 621 select ARCH_MTD_XIP 622 select ARCH_REQUIRE_GPIOLIB 623 select ARM_CPU_SUSPEND if PM 624 select AUTO_ZRELADDR 625 select CLKDEV_LOOKUP 626 select CLKSRC_MMIO 627 select CLKSRC_OF 628 select GENERIC_CLOCKEVENTS 629 select GPIO_PXA 630 select HAVE_IDE 631 select MULTI_IRQ_HANDLER 632 select PLAT_PXA 633 select SPARSE_IRQ 634 help 635 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 636 637config ARCH_MSM 638 bool "Qualcomm MSM (non-multiplatform)" 639 select ARCH_REQUIRE_GPIOLIB 640 select COMMON_CLK 641 select GENERIC_CLOCKEVENTS 642 help 643 Support for Qualcomm MSM/QSD based systems. This runs on the 644 apps processor of the MSM/QSD and depends on a shared memory 645 interface to the modem processor which runs the baseband 646 stack and controls some vital subsystems 647 (clock and power control, etc). 648 649config ARCH_SHMOBILE_LEGACY 650 bool "Renesas ARM SoCs (non-multiplatform)" 651 select ARCH_SHMOBILE 652 select ARM_PATCH_PHYS_VIRT if MMU 653 select CLKDEV_LOOKUP 654 select GENERIC_CLOCKEVENTS 655 select HAVE_ARM_SCU if SMP 656 select HAVE_ARM_TWD if SMP 657 select HAVE_MACH_CLKDEV 658 select HAVE_SMP 659 select MIGHT_HAVE_CACHE_L2X0 660 select MULTI_IRQ_HANDLER 661 select NO_IOPORT_MAP 662 select PINCTRL 663 select PM_GENERIC_DOMAINS if PM 664 select SPARSE_IRQ 665 help 666 Support for Renesas ARM SoC platforms using a non-multiplatform 667 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car 668 and RZ families. 669 670config ARCH_RPC 671 bool "RiscPC" 672 select ARCH_ACORN 673 select ARCH_MAY_HAVE_PC_FDC 674 select ARCH_SPARSEMEM_ENABLE 675 select ARCH_USES_GETTIMEOFFSET 676 select CPU_SA110 677 select FIQ 678 select HAVE_IDE 679 select HAVE_PATA_PLATFORM 680 select ISA_DMA_API 681 select NEED_MACH_IO_H 682 select NEED_MACH_MEMORY_H 683 select NO_IOPORT_MAP 684 select VIRT_TO_BUS 685 help 686 On the Acorn Risc-PC, Linux can support the internal IDE disk and 687 CD-ROM interface, serial and parallel port, and the floppy drive. 688 689config ARCH_SA1100 690 bool "SA1100-based" 691 select ARCH_MTD_XIP 692 select ARCH_REQUIRE_GPIOLIB 693 select ARCH_SPARSEMEM_ENABLE 694 select CLKDEV_LOOKUP 695 select CLKSRC_MMIO 696 select CPU_FREQ 697 select CPU_SA1100 698 select GENERIC_CLOCKEVENTS 699 select HAVE_IDE 700 select ISA 701 select NEED_MACH_MEMORY_H 702 select SPARSE_IRQ 703 help 704 Support for StrongARM 11x0 based boards. 705 706config ARCH_S3C24XX 707 bool "Samsung S3C24XX SoCs" 708 select ARCH_REQUIRE_GPIOLIB 709 select ATAGS 710 select CLKDEV_LOOKUP 711 select CLKSRC_SAMSUNG_PWM 712 select GENERIC_CLOCKEVENTS 713 select GPIO_SAMSUNG 714 select HAVE_S3C2410_I2C if I2C 715 select HAVE_S3C2410_WATCHDOG if WATCHDOG 716 select HAVE_S3C_RTC if RTC_CLASS 717 select MULTI_IRQ_HANDLER 718 select NEED_MACH_IO_H 719 select SAMSUNG_ATAGS 720 help 721 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 722 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 723 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 724 Samsung SMDK2410 development board (and derivatives). 725 726config ARCH_S3C64XX 727 bool "Samsung S3C64XX" 728 select ARCH_REQUIRE_GPIOLIB 729 select ARM_AMBA 730 select ARM_VIC 731 select ATAGS 732 select CLKDEV_LOOKUP 733 select CLKSRC_SAMSUNG_PWM 734 select COMMON_CLK_SAMSUNG 735 select CPU_V6K 736 select GENERIC_CLOCKEVENTS 737 select GPIO_SAMSUNG 738 select HAVE_S3C2410_I2C if I2C 739 select HAVE_S3C2410_WATCHDOG if WATCHDOG 740 select HAVE_TCM 741 select NO_IOPORT_MAP 742 select PLAT_SAMSUNG 743 select PM_GENERIC_DOMAINS if PM 744 select S3C_DEV_NAND 745 select S3C_GPIO_TRACK 746 select SAMSUNG_ATAGS 747 select SAMSUNG_WAKEMASK 748 select SAMSUNG_WDT_RESET 749 help 750 Samsung S3C64XX series based systems 751 752config ARCH_DAVINCI 753 bool "TI DaVinci" 754 select ARCH_HAS_HOLES_MEMORYMODEL 755 select ARCH_REQUIRE_GPIOLIB 756 select CLKDEV_LOOKUP 757 select GENERIC_ALLOCATOR 758 select GENERIC_CLOCKEVENTS 759 select GENERIC_IRQ_CHIP 760 select HAVE_IDE 761 select TI_PRIV_EDMA 762 select USE_OF 763 select ZONE_DMA 764 help 765 Support for TI's DaVinci platform. 766 767config ARCH_OMAP1 768 bool "TI OMAP1" 769 depends on MMU 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_IDE 778 select IRQ_DOMAIN 779 select NEED_MACH_IO_H if PCCARD 780 select NEED_MACH_MEMORY_H 781 help 782 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 783 784endchoice 785 786menu "Multiple platform selection" 787 depends on ARCH_MULTIPLATFORM 788 789comment "CPU Core family selection" 790 791config ARCH_MULTI_V4 792 bool "ARMv4 based platforms (FA526)" 793 depends on !ARCH_MULTI_V6_V7 794 select ARCH_MULTI_V4_V5 795 select CPU_FA526 796 797config ARCH_MULTI_V4T 798 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 799 depends on !ARCH_MULTI_V6_V7 800 select ARCH_MULTI_V4_V5 801 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 802 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 803 CPU_ARM925T || CPU_ARM940T) 804 805config ARCH_MULTI_V5 806 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 807 depends on !ARCH_MULTI_V6_V7 808 select ARCH_MULTI_V4_V5 809 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 810 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 811 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 812 813config ARCH_MULTI_V4_V5 814 bool 815 816config ARCH_MULTI_V6 817 bool "ARMv6 based platforms (ARM11)" 818 select ARCH_MULTI_V6_V7 819 select CPU_V6K 820 821config ARCH_MULTI_V7 822 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 823 default y 824 select ARCH_MULTI_V6_V7 825 select CPU_V7 826 select HAVE_SMP 827 828config ARCH_MULTI_V6_V7 829 bool 830 select MIGHT_HAVE_CACHE_L2X0 831 832config ARCH_MULTI_CPU_AUTO 833 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 834 select ARCH_MULTI_V5 835 836endmenu 837 838config ARCH_VIRT 839 bool "Dummy Virtual Machine" if ARCH_MULTI_V7 840 select ARM_AMBA 841 select ARM_GIC 842 select ARM_PSCI 843 select HAVE_ARM_ARCH_TIMER 844 845# 846# This is sorted alphabetically by mach-* pathname. However, plat-* 847# Kconfigs may be included either alphabetically (according to the 848# plat- suffix) or along side the corresponding mach-* source. 849# 850source "arch/arm/mach-mvebu/Kconfig" 851 852source "arch/arm/mach-at91/Kconfig" 853 854source "arch/arm/mach-axxia/Kconfig" 855 856source "arch/arm/mach-bcm/Kconfig" 857 858source "arch/arm/mach-berlin/Kconfig" 859 860source "arch/arm/mach-clps711x/Kconfig" 861 862source "arch/arm/mach-cns3xxx/Kconfig" 863 864source "arch/arm/mach-davinci/Kconfig" 865 866source "arch/arm/mach-dove/Kconfig" 867 868source "arch/arm/mach-ep93xx/Kconfig" 869 870source "arch/arm/mach-footbridge/Kconfig" 871 872source "arch/arm/mach-gemini/Kconfig" 873 874source "arch/arm/mach-highbank/Kconfig" 875 876source "arch/arm/mach-hisi/Kconfig" 877 878source "arch/arm/mach-integrator/Kconfig" 879 880source "arch/arm/mach-iop32x/Kconfig" 881 882source "arch/arm/mach-iop33x/Kconfig" 883 884source "arch/arm/mach-iop13xx/Kconfig" 885 886source "arch/arm/mach-ixp4xx/Kconfig" 887 888source "arch/arm/mach-keystone/Kconfig" 889 890source "arch/arm/mach-ks8695/Kconfig" 891 892source "arch/arm/mach-msm/Kconfig" 893 894source "arch/arm/mach-moxart/Kconfig" 895 896source "arch/arm/mach-mv78xx0/Kconfig" 897 898source "arch/arm/mach-imx/Kconfig" 899 900source "arch/arm/mach-mediatek/Kconfig" 901 902source "arch/arm/mach-mxs/Kconfig" 903 904source "arch/arm/mach-netx/Kconfig" 905 906source "arch/arm/mach-nomadik/Kconfig" 907 908source "arch/arm/mach-nspire/Kconfig" 909 910source "arch/arm/plat-omap/Kconfig" 911 912source "arch/arm/mach-omap1/Kconfig" 913 914source "arch/arm/mach-omap2/Kconfig" 915 916source "arch/arm/mach-orion5x/Kconfig" 917 918source "arch/arm/mach-picoxcell/Kconfig" 919 920source "arch/arm/mach-pxa/Kconfig" 921source "arch/arm/plat-pxa/Kconfig" 922 923source "arch/arm/mach-mmp/Kconfig" 924 925source "arch/arm/mach-qcom/Kconfig" 926 927source "arch/arm/mach-realview/Kconfig" 928 929source "arch/arm/mach-rockchip/Kconfig" 930 931source "arch/arm/mach-sa1100/Kconfig" 932 933source "arch/arm/mach-socfpga/Kconfig" 934 935source "arch/arm/mach-spear/Kconfig" 936 937source "arch/arm/mach-sti/Kconfig" 938 939source "arch/arm/mach-s3c24xx/Kconfig" 940 941source "arch/arm/mach-s3c64xx/Kconfig" 942 943source "arch/arm/mach-s5pv210/Kconfig" 944 945source "arch/arm/mach-exynos/Kconfig" 946source "arch/arm/plat-samsung/Kconfig" 947 948source "arch/arm/mach-shmobile/Kconfig" 949 950source "arch/arm/mach-sunxi/Kconfig" 951 952source "arch/arm/mach-prima2/Kconfig" 953 954source "arch/arm/mach-tegra/Kconfig" 955 956source "arch/arm/mach-u300/Kconfig" 957 958source "arch/arm/mach-ux500/Kconfig" 959 960source "arch/arm/mach-versatile/Kconfig" 961 962source "arch/arm/mach-vexpress/Kconfig" 963source "arch/arm/plat-versatile/Kconfig" 964 965source "arch/arm/mach-vt8500/Kconfig" 966 967source "arch/arm/mach-w90x900/Kconfig" 968 969source "arch/arm/mach-zynq/Kconfig" 970 971# Definitions to make life easier 972config ARCH_ACORN 973 bool 974 975config PLAT_IOP 976 bool 977 select GENERIC_CLOCKEVENTS 978 979config PLAT_ORION 980 bool 981 select CLKSRC_MMIO 982 select COMMON_CLK 983 select GENERIC_IRQ_CHIP 984 select IRQ_DOMAIN 985 986config PLAT_ORION_LEGACY 987 bool 988 select PLAT_ORION 989 990config PLAT_PXA 991 bool 992 993config PLAT_VERSATILE 994 bool 995 996config ARM_TIMER_SP804 997 bool 998 select CLKSRC_MMIO 999 select CLKSRC_OF if OF 1000 1001source "arch/arm/firmware/Kconfig" 1002 1003source arch/arm/mm/Kconfig 1004 1005config IWMMXT 1006 bool "Enable iWMMXt support" 1007 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 1008 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 1009 help 1010 Enable support for iWMMXt context switching at run time if 1011 running on a CPU that supports it. 1012 1013config MULTI_IRQ_HANDLER 1014 bool 1015 help 1016 Allow each machine to specify it's own IRQ handler at run time. 1017 1018if !MMU 1019source "arch/arm/Kconfig-nommu" 1020endif 1021 1022config PJ4B_ERRATA_4742 1023 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1024 depends on CPU_PJ4B && MACH_ARMADA_370 1025 default y 1026 help 1027 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1028 Event (WFE) IDLE states, a specific timing sensitivity exists between 1029 the retiring WFI/WFE instructions and the newly issued subsequent 1030 instructions. This sensitivity can result in a CPU hang scenario. 1031 Workaround: 1032 The software must insert either a Data Synchronization Barrier (DSB) 1033 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1034 instruction 1035 1036config ARM_ERRATA_326103 1037 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1038 depends on CPU_V6 1039 help 1040 Executing a SWP instruction to read-only memory does not set bit 11 1041 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1042 treat the access as a read, preventing a COW from occurring and 1043 causing the faulting task to livelock. 1044 1045config ARM_ERRATA_411920 1046 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1047 depends on CPU_V6 || CPU_V6K 1048 help 1049 Invalidation of the Instruction Cache operation can 1050 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1051 It does not affect the MPCore. This option enables the ARM Ltd. 1052 recommended workaround. 1053 1054config ARM_ERRATA_430973 1055 bool "ARM errata: Stale prediction on replaced interworking branch" 1056 depends on CPU_V7 1057 help 1058 This option enables the workaround for the 430973 Cortex-A8 1059 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb 1060 interworking branch is replaced with another code sequence at the 1061 same virtual address, whether due to self-modifying code or virtual 1062 to physical address re-mapping, Cortex-A8 does not recover from the 1063 stale interworking branch prediction. This results in Cortex-A8 1064 executing the new code sequence in the incorrect ARM or Thumb state. 1065 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1066 and also flushes the branch target cache at every context switch. 1067 Note that setting specific bits in the ACTLR register may not be 1068 available in non-secure mode. 1069 1070config ARM_ERRATA_458693 1071 bool "ARM errata: Processor deadlock when a false hazard is created" 1072 depends on CPU_V7 1073 depends on !ARCH_MULTIPLATFORM 1074 help 1075 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1076 erratum. For very specific sequences of memory operations, it is 1077 possible for a hazard condition intended for a cache line to instead 1078 be incorrectly associated with a different cache line. This false 1079 hazard might then cause a processor deadlock. The workaround enables 1080 the L1 caching of the NEON accesses and disables the PLD instruction 1081 in the ACTLR register. Note that setting specific bits in the ACTLR 1082 register may not be available in non-secure mode. 1083 1084config ARM_ERRATA_460075 1085 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1086 depends on CPU_V7 1087 depends on !ARCH_MULTIPLATFORM 1088 help 1089 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1090 erratum. Any asynchronous access to the L2 cache may encounter a 1091 situation in which recent store transactions to the L2 cache are lost 1092 and overwritten with stale memory contents from external memory. The 1093 workaround disables the write-allocate mode for the L2 cache via the 1094 ACTLR register. Note that setting specific bits in the ACTLR register 1095 may not be available in non-secure mode. 1096 1097config ARM_ERRATA_742230 1098 bool "ARM errata: DMB operation may be faulty" 1099 depends on CPU_V7 && SMP 1100 depends on !ARCH_MULTIPLATFORM 1101 help 1102 This option enables the workaround for the 742230 Cortex-A9 1103 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1104 between two write operations may not ensure the correct visibility 1105 ordering of the two writes. This workaround sets a specific bit in 1106 the diagnostic register of the Cortex-A9 which causes the DMB 1107 instruction to behave as a DSB, ensuring the correct behaviour of 1108 the two writes. 1109 1110config ARM_ERRATA_742231 1111 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1112 depends on CPU_V7 && SMP 1113 depends on !ARCH_MULTIPLATFORM 1114 help 1115 This option enables the workaround for the 742231 Cortex-A9 1116 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1117 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1118 accessing some data located in the same cache line, may get corrupted 1119 data due to bad handling of the address hazard when the line gets 1120 replaced from one of the CPUs at the same time as another CPU is 1121 accessing it. This workaround sets specific bits in the diagnostic 1122 register of the Cortex-A9 which reduces the linefill issuing 1123 capabilities of the processor. 1124 1125config ARM_ERRATA_643719 1126 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1127 depends on CPU_V7 && SMP 1128 help 1129 This option enables the workaround for the 643719 Cortex-A9 (prior to 1130 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1131 register returns zero when it should return one. The workaround 1132 corrects this value, ensuring cache maintenance operations which use 1133 it behave as intended and avoiding data corruption. 1134 1135config ARM_ERRATA_720789 1136 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1137 depends on CPU_V7 1138 help 1139 This option enables the workaround for the 720789 Cortex-A9 (prior to 1140 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1141 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1142 As a consequence of this erratum, some TLB entries which should be 1143 invalidated are not, resulting in an incoherency in the system page 1144 tables. The workaround changes the TLB flushing routines to invalidate 1145 entries regardless of the ASID. 1146 1147config ARM_ERRATA_743622 1148 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1149 depends on CPU_V7 1150 depends on !ARCH_MULTIPLATFORM 1151 help 1152 This option enables the workaround for the 743622 Cortex-A9 1153 (r2p*) erratum. Under very rare conditions, a faulty 1154 optimisation in the Cortex-A9 Store Buffer may lead to data 1155 corruption. This workaround sets a specific bit in the diagnostic 1156 register of the Cortex-A9 which disables the Store Buffer 1157 optimisation, preventing the defect from occurring. This has no 1158 visible impact on the overall performance or power consumption of the 1159 processor. 1160 1161config ARM_ERRATA_751472 1162 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1163 depends on CPU_V7 1164 depends on !ARCH_MULTIPLATFORM 1165 help 1166 This option enables the workaround for the 751472 Cortex-A9 (prior 1167 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1168 completion of a following broadcasted operation if the second 1169 operation is received by a CPU before the ICIALLUIS has completed, 1170 potentially leading to corrupted entries in the cache or TLB. 1171 1172config ARM_ERRATA_754322 1173 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1174 depends on CPU_V7 1175 help 1176 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1177 r3p*) erratum. A speculative memory access may cause a page table walk 1178 which starts prior to an ASID switch but completes afterwards. This 1179 can populate the micro-TLB with a stale entry which may be hit with 1180 the new ASID. This workaround places two dsb instructions in the mm 1181 switching code so that no page table walks can cross the ASID switch. 1182 1183config ARM_ERRATA_754327 1184 bool "ARM errata: no automatic Store Buffer drain" 1185 depends on CPU_V7 && SMP 1186 help 1187 This option enables the workaround for the 754327 Cortex-A9 (prior to 1188 r2p0) erratum. The Store Buffer does not have any automatic draining 1189 mechanism and therefore a livelock may occur if an external agent 1190 continuously polls a memory location waiting to observe an update. 1191 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1192 written polling loops from denying visibility of updates to memory. 1193 1194config ARM_ERRATA_364296 1195 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1196 depends on CPU_V6 1197 help 1198 This options enables the workaround for the 364296 ARM1136 1199 r0p2 erratum (possible cache data corruption with 1200 hit-under-miss enabled). It sets the undocumented bit 31 in 1201 the auxiliary control register and the FI bit in the control 1202 register, thus disabling hit-under-miss without putting the 1203 processor into full low interrupt latency mode. ARM11MPCore 1204 is not affected. 1205 1206config ARM_ERRATA_764369 1207 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1208 depends on CPU_V7 && SMP 1209 help 1210 This option enables the workaround for erratum 764369 1211 affecting Cortex-A9 MPCore with two or more processors (all 1212 current revisions). Under certain timing circumstances, a data 1213 cache line maintenance operation by MVA targeting an Inner 1214 Shareable memory region may fail to proceed up to either the 1215 Point of Coherency or to the Point of Unification of the 1216 system. This workaround adds a DSB instruction before the 1217 relevant cache maintenance functions and sets a specific bit 1218 in the diagnostic control register of the SCU. 1219 1220config ARM_ERRATA_775420 1221 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1222 depends on CPU_V7 1223 help 1224 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1225 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1226 operation aborts with MMU exception, it might cause the processor 1227 to deadlock. This workaround puts DSB before executing ISB if 1228 an abort may occur on cache maintenance. 1229 1230config ARM_ERRATA_798181 1231 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1232 depends on CPU_V7 && SMP 1233 help 1234 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1235 adequately shooting down all use of the old entries. This 1236 option enables the Linux kernel workaround for this erratum 1237 which sends an IPI to the CPUs that are running the same ASID 1238 as the one being invalidated. 1239 1240config ARM_ERRATA_773022 1241 bool "ARM errata: incorrect instructions may be executed from loop buffer" 1242 depends on CPU_V7 1243 help 1244 This option enables the workaround for the 773022 Cortex-A15 1245 (up to r0p4) erratum. In certain rare sequences of code, the 1246 loop buffer may deliver incorrect instructions. This 1247 workaround disables the loop buffer to avoid the erratum. 1248 1249endmenu 1250 1251source "arch/arm/common/Kconfig" 1252 1253menu "Bus support" 1254 1255config ARM_AMBA 1256 bool 1257 1258config ISA 1259 bool 1260 help 1261 Find out whether you have ISA slots on your motherboard. ISA is the 1262 name of a bus system, i.e. the way the CPU talks to the other stuff 1263 inside your box. Other bus systems are PCI, EISA, MicroChannel 1264 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1265 newer boards don't support it. If you have ISA, say Y, otherwise N. 1266 1267# Select ISA DMA controller support 1268config ISA_DMA 1269 bool 1270 select ISA_DMA_API 1271 1272# Select ISA DMA interface 1273config ISA_DMA_API 1274 bool 1275 1276config PCI 1277 bool "PCI support" if MIGHT_HAVE_PCI 1278 help 1279 Find out whether you have a PCI motherboard. PCI is the name of a 1280 bus system, i.e. the way the CPU talks to the other stuff inside 1281 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1282 VESA. If you have PCI, say Y, otherwise N. 1283 1284config PCI_DOMAINS 1285 bool 1286 depends on PCI 1287 1288config PCI_NANOENGINE 1289 bool "BSE nanoEngine PCI support" 1290 depends on SA1100_NANOENGINE 1291 help 1292 Enable PCI on the BSE nanoEngine board. 1293 1294config PCI_SYSCALL 1295 def_bool PCI 1296 1297config PCI_HOST_ITE8152 1298 bool 1299 depends on PCI && MACH_ARMCORE 1300 default y 1301 select DMABOUNCE 1302 1303source "drivers/pci/Kconfig" 1304source "drivers/pci/pcie/Kconfig" 1305 1306source "drivers/pcmcia/Kconfig" 1307 1308endmenu 1309 1310menu "Kernel Features" 1311 1312config HAVE_SMP 1313 bool 1314 help 1315 This option should be selected by machines which have an SMP- 1316 capable CPU. 1317 1318 The only effect of this option is to make the SMP-related 1319 options available to the user for configuration. 1320 1321config SMP 1322 bool "Symmetric Multi-Processing" 1323 depends on CPU_V6K || CPU_V7 1324 depends on GENERIC_CLOCKEVENTS 1325 depends on HAVE_SMP 1326 depends on MMU || ARM_MPU 1327 help 1328 This enables support for systems with more than one CPU. If you have 1329 a system with only one CPU, say N. If you have a system with more 1330 than one CPU, say Y. 1331 1332 If you say N here, the kernel will run on uni- and multiprocessor 1333 machines, but will use only one CPU of a multiprocessor machine. If 1334 you say Y here, the kernel will run on many, but not all, 1335 uniprocessor machines. On a uniprocessor machine, the kernel 1336 will run faster if you say N here. 1337 1338 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1339 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1340 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1341 1342 If you don't know what to do here, say N. 1343 1344config SMP_ON_UP 1345 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)" 1346 depends on SMP && !XIP_KERNEL && MMU 1347 default y 1348 help 1349 SMP kernels contain instructions which fail on non-SMP processors. 1350 Enabling this option allows the kernel to modify itself to make 1351 these instructions safe. Disabling it allows about 1K of space 1352 savings. 1353 1354 If you don't know what to do here, say Y. 1355 1356config ARM_CPU_TOPOLOGY 1357 bool "Support cpu topology definition" 1358 depends on SMP && CPU_V7 1359 default y 1360 help 1361 Support ARM cpu topology definition. The MPIDR register defines 1362 affinity between processors which is then used to describe the cpu 1363 topology of an ARM System. 1364 1365config SCHED_MC 1366 bool "Multi-core scheduler support" 1367 depends on ARM_CPU_TOPOLOGY 1368 help 1369 Multi-core scheduler support improves the CPU scheduler's decision 1370 making when dealing with multi-core CPU chips at a cost of slightly 1371 increased overhead in some places. If unsure say N here. 1372 1373config SCHED_SMT 1374 bool "SMT scheduler support" 1375 depends on ARM_CPU_TOPOLOGY 1376 help 1377 Improves the CPU scheduler's decision making when dealing with 1378 MultiThreading at a cost of slightly increased overhead in some 1379 places. If unsure say N here. 1380 1381config HAVE_ARM_SCU 1382 bool 1383 help 1384 This option enables support for the ARM system coherency unit 1385 1386config HAVE_ARM_ARCH_TIMER 1387 bool "Architected timer support" 1388 depends on CPU_V7 1389 select ARM_ARCH_TIMER 1390 select GENERIC_CLOCKEVENTS 1391 help 1392 This option enables support for the ARM architected timer 1393 1394config HAVE_ARM_TWD 1395 bool 1396 depends on SMP 1397 select CLKSRC_OF if OF 1398 help 1399 This options enables support for the ARM timer and watchdog unit 1400 1401config MCPM 1402 bool "Multi-Cluster Power Management" 1403 depends on CPU_V7 && SMP 1404 help 1405 This option provides the common power management infrastructure 1406 for (multi-)cluster based systems, such as big.LITTLE based 1407 systems. 1408 1409config BIG_LITTLE 1410 bool "big.LITTLE support (Experimental)" 1411 depends on CPU_V7 && SMP 1412 select MCPM 1413 help 1414 This option enables support selections for the big.LITTLE 1415 system architecture. 1416 1417config BL_SWITCHER 1418 bool "big.LITTLE switcher support" 1419 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU 1420 select ARM_CPU_SUSPEND 1421 select CPU_PM 1422 help 1423 The big.LITTLE "switcher" provides the core functionality to 1424 transparently handle transition between a cluster of A15's 1425 and a cluster of A7's in a big.LITTLE system. 1426 1427config BL_SWITCHER_DUMMY_IF 1428 tristate "Simple big.LITTLE switcher user interface" 1429 depends on BL_SWITCHER && DEBUG_KERNEL 1430 help 1431 This is a simple and dummy char dev interface to control 1432 the big.LITTLE switcher core code. It is meant for 1433 debugging purposes only. 1434 1435choice 1436 prompt "Memory split" 1437 depends on MMU 1438 default VMSPLIT_3G 1439 help 1440 Select the desired split between kernel and user memory. 1441 1442 If you are not absolutely sure what you are doing, leave this 1443 option alone! 1444 1445 config VMSPLIT_3G 1446 bool "3G/1G user/kernel split" 1447 config VMSPLIT_2G 1448 bool "2G/2G user/kernel split" 1449 config VMSPLIT_1G 1450 bool "1G/3G user/kernel split" 1451endchoice 1452 1453config PAGE_OFFSET 1454 hex 1455 default PHYS_OFFSET if !MMU 1456 default 0x40000000 if VMSPLIT_1G 1457 default 0x80000000 if VMSPLIT_2G 1458 default 0xC0000000 1459 1460config NR_CPUS 1461 int "Maximum number of CPUs (2-32)" 1462 range 2 32 1463 depends on SMP 1464 default "4" 1465 1466config HOTPLUG_CPU 1467 bool "Support for hot-pluggable CPUs" 1468 depends on SMP 1469 help 1470 Say Y here to experiment with turning CPUs off and on. CPUs 1471 can be controlled through /sys/devices/system/cpu. 1472 1473config ARM_PSCI 1474 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1475 depends on CPU_V7 1476 help 1477 Say Y here if you want Linux to communicate with system firmware 1478 implementing the PSCI specification for CPU-centric power 1479 management operations described in ARM document number ARM DEN 1480 0022A ("Power State Coordination Interface System Software on 1481 ARM processors"). 1482 1483# The GPIO number here must be sorted by descending number. In case of 1484# a multiplatform kernel, we just want the highest value required by the 1485# selected platforms. 1486config ARCH_NR_GPIO 1487 int 1488 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA 1489 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ 1490 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 1491 default 416 if ARCH_SUNXI 1492 default 392 if ARCH_U8500 1493 default 352 if ARCH_VT8500 1494 default 288 if ARCH_ROCKCHIP 1495 default 264 if MACH_H4700 1496 default 0 1497 help 1498 Maximum number of GPIOs in the system. 1499 1500 If unsure, leave the default value. 1501 1502source kernel/Kconfig.preempt 1503 1504config HZ_FIXED 1505 int 1506 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ 1507 ARCH_S5PV210 || ARCH_EXYNOS4 1508 default AT91_TIMER_HZ if ARCH_AT91 1509 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY 1510 default 0 1511 1512choice 1513 depends on HZ_FIXED = 0 1514 prompt "Timer frequency" 1515 1516config HZ_100 1517 bool "100 Hz" 1518 1519config HZ_200 1520 bool "200 Hz" 1521 1522config HZ_250 1523 bool "250 Hz" 1524 1525config HZ_300 1526 bool "300 Hz" 1527 1528config HZ_500 1529 bool "500 Hz" 1530 1531config HZ_1000 1532 bool "1000 Hz" 1533 1534endchoice 1535 1536config HZ 1537 int 1538 default HZ_FIXED if HZ_FIXED != 0 1539 default 100 if HZ_100 1540 default 200 if HZ_200 1541 default 250 if HZ_250 1542 default 300 if HZ_300 1543 default 500 if HZ_500 1544 default 1000 1545 1546config SCHED_HRTICK 1547 def_bool HIGH_RES_TIMERS 1548 1549config THUMB2_KERNEL 1550 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1551 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1552 default y if CPU_THUMBONLY 1553 select AEABI 1554 select ARM_ASM_UNIFIED 1555 select ARM_UNWIND 1556 help 1557 By enabling this option, the kernel will be compiled in 1558 Thumb-2 mode. A compiler/assembler that understand the unified 1559 ARM-Thumb syntax is needed. 1560 1561 If unsure, say N. 1562 1563config THUMB2_AVOID_R_ARM_THM_JUMP11 1564 bool "Work around buggy Thumb-2 short branch relocations in gas" 1565 depends on THUMB2_KERNEL && MODULES 1566 default y 1567 help 1568 Various binutils versions can resolve Thumb-2 branches to 1569 locally-defined, preemptible global symbols as short-range "b.n" 1570 branch instructions. 1571 1572 This is a problem, because there's no guarantee the final 1573 destination of the symbol, or any candidate locations for a 1574 trampoline, are within range of the branch. For this reason, the 1575 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1576 relocation in modules at all, and it makes little sense to add 1577 support. 1578 1579 The symptom is that the kernel fails with an "unsupported 1580 relocation" error when loading some modules. 1581 1582 Until fixed tools are available, passing 1583 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1584 code which hits this problem, at the cost of a bit of extra runtime 1585 stack usage in some cases. 1586 1587 The problem is described in more detail at: 1588 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1589 1590 Only Thumb-2 kernels are affected. 1591 1592 Unless you are sure your tools don't have this problem, say Y. 1593 1594config ARM_ASM_UNIFIED 1595 bool 1596 1597config AEABI 1598 bool "Use the ARM EABI to compile the kernel" 1599 help 1600 This option allows for the kernel to be compiled using the latest 1601 ARM ABI (aka EABI). This is only useful if you are using a user 1602 space environment that is also compiled with EABI. 1603 1604 Since there are major incompatibilities between the legacy ABI and 1605 EABI, especially with regard to structure member alignment, this 1606 option also changes the kernel syscall calling convention to 1607 disambiguate both ABIs and allow for backward compatibility support 1608 (selected with CONFIG_OABI_COMPAT). 1609 1610 To use this you need GCC version 4.0.0 or later. 1611 1612config OABI_COMPAT 1613 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1614 depends on AEABI && !THUMB2_KERNEL 1615 help 1616 This option preserves the old syscall interface along with the 1617 new (ARM EABI) one. It also provides a compatibility layer to 1618 intercept syscalls that have structure arguments which layout 1619 in memory differs between the legacy ABI and the new ARM EABI 1620 (only for non "thumb" binaries). This option adds a tiny 1621 overhead to all syscalls and produces a slightly larger kernel. 1622 1623 The seccomp filter system will not be available when this is 1624 selected, since there is no way yet to sensibly distinguish 1625 between calling conventions during filtering. 1626 1627 If you know you'll be using only pure EABI user space then you 1628 can say N here. If this option is not selected and you attempt 1629 to execute a legacy ABI binary then the result will be 1630 UNPREDICTABLE (in fact it can be predicted that it won't work 1631 at all). If in doubt say N. 1632 1633config ARCH_HAS_HOLES_MEMORYMODEL 1634 bool 1635 1636config ARCH_SPARSEMEM_ENABLE 1637 bool 1638 1639config ARCH_SPARSEMEM_DEFAULT 1640 def_bool ARCH_SPARSEMEM_ENABLE 1641 1642config ARCH_SELECT_MEMORY_MODEL 1643 def_bool ARCH_SPARSEMEM_ENABLE 1644 1645config HAVE_ARCH_PFN_VALID 1646 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1647 1648config HIGHMEM 1649 bool "High Memory Support" 1650 depends on MMU 1651 help 1652 The address space of ARM processors is only 4 Gigabytes large 1653 and it has to accommodate user address space, kernel address 1654 space as well as some memory mapped IO. That means that, if you 1655 have a large amount of physical memory and/or IO, not all of the 1656 memory can be "permanently mapped" by the kernel. The physical 1657 memory that is not permanently mapped is called "high memory". 1658 1659 Depending on the selected kernel/user memory split, minimum 1660 vmalloc space and actual amount of RAM, you may not need this 1661 option which should result in a slightly faster kernel. 1662 1663 If unsure, say n. 1664 1665config HIGHPTE 1666 bool "Allocate 2nd-level pagetables from highmem" 1667 depends on HIGHMEM 1668 1669config HW_PERF_EVENTS 1670 bool "Enable hardware performance counter support for perf events" 1671 depends on PERF_EVENTS 1672 default y 1673 help 1674 Enable hardware performance counter support for perf events. If 1675 disabled, perf events will use software events only. 1676 1677config SYS_SUPPORTS_HUGETLBFS 1678 def_bool y 1679 depends on ARM_LPAE 1680 1681config HAVE_ARCH_TRANSPARENT_HUGEPAGE 1682 def_bool y 1683 depends on ARM_LPAE 1684 1685config ARCH_WANT_GENERAL_HUGETLB 1686 def_bool y 1687 1688source "mm/Kconfig" 1689 1690config FORCE_MAX_ZONEORDER 1691 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY 1692 range 11 64 if ARCH_SHMOBILE_LEGACY 1693 default "12" if SOC_AM33XX 1694 default "9" if SA1111 || ARCH_EFM32 1695 default "11" 1696 help 1697 The kernel memory allocator divides physically contiguous memory 1698 blocks into "zones", where each zone is a power of two number of 1699 pages. This option selects the largest power of two that the kernel 1700 keeps in the memory allocator. If you need to allocate very large 1701 blocks of physically contiguous memory, then you may need to 1702 increase this value. 1703 1704 This config option is actually maximum order plus one. For example, 1705 a value of 11 means that the largest free memory block is 2^10 pages. 1706 1707config ALIGNMENT_TRAP 1708 bool 1709 depends on CPU_CP15_MMU 1710 default y if !ARCH_EBSA110 1711 select HAVE_PROC_CPU if PROC_FS 1712 help 1713 ARM processors cannot fetch/store information which is not 1714 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1715 address divisible by 4. On 32-bit ARM processors, these non-aligned 1716 fetch/store instructions will be emulated in software if you say 1717 here, which has a severe performance impact. This is necessary for 1718 correct operation of some network protocols. With an IP-only 1719 configuration it is safe to say N, otherwise say Y. 1720 1721config UACCESS_WITH_MEMCPY 1722 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1723 depends on MMU 1724 default y if CPU_FEROCEON 1725 help 1726 Implement faster copy_to_user and clear_user methods for CPU 1727 cores where a 8-word STM instruction give significantly higher 1728 memory write throughput than a sequence of individual 32bit stores. 1729 1730 A possible side effect is a slight increase in scheduling latency 1731 between threads sharing the same address space if they invoke 1732 such copy operations with large buffers. 1733 1734 However, if the CPU data cache is using a write-allocate mode, 1735 this option is unlikely to provide any performance gain. 1736 1737config SECCOMP 1738 bool 1739 prompt "Enable seccomp to safely compute untrusted bytecode" 1740 ---help--- 1741 This kernel feature is useful for number crunching applications 1742 that may need to compute untrusted bytecode during their 1743 execution. By using pipes or other transports made available to 1744 the process as file descriptors supporting the read/write 1745 syscalls, it's possible to isolate those applications in 1746 their own address space using seccomp. Once seccomp is 1747 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1748 and the task is only allowed to execute a few safe syscalls 1749 defined by each seccomp mode. 1750 1751config SWIOTLB 1752 def_bool y 1753 1754config IOMMU_HELPER 1755 def_bool SWIOTLB 1756 1757config XEN_DOM0 1758 def_bool y 1759 depends on XEN 1760 1761config XEN 1762 bool "Xen guest support on ARM (EXPERIMENTAL)" 1763 depends on ARM && AEABI && OF 1764 depends on CPU_V7 && !CPU_V6 1765 depends on !GENERIC_ATOMIC64 1766 depends on MMU 1767 select ARCH_DMA_ADDR_T_64BIT 1768 select ARM_PSCI 1769 select SWIOTLB_XEN 1770 help 1771 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1772 1773endmenu 1774 1775menu "Boot options" 1776 1777config USE_OF 1778 bool "Flattened Device Tree support" 1779 select IRQ_DOMAIN 1780 select OF 1781 select OF_EARLY_FLATTREE 1782 select OF_RESERVED_MEM 1783 help 1784 Include support for flattened device tree machine descriptions. 1785 1786config ATAGS 1787 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1788 default y 1789 help 1790 This is the traditional way of passing data to the kernel at boot 1791 time. If you are solely relying on the flattened device tree (or 1792 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1793 to remove ATAGS support from your kernel binary. If unsure, 1794 leave this to y. 1795 1796config DEPRECATED_PARAM_STRUCT 1797 bool "Provide old way to pass kernel parameters" 1798 depends on ATAGS 1799 help 1800 This was deprecated in 2001 and announced to live on for 5 years. 1801 Some old boot loaders still use this way. 1802 1803# Compressed boot loader in ROM. Yes, we really want to ask about 1804# TEXT and BSS so we preserve their values in the config files. 1805config ZBOOT_ROM_TEXT 1806 hex "Compressed ROM boot loader base address" 1807 default "0" 1808 help 1809 The physical address at which the ROM-able zImage is to be 1810 placed in the target. Platforms which normally make use of 1811 ROM-able zImage formats normally set this to a suitable 1812 value in their defconfig file. 1813 1814 If ZBOOT_ROM is not enabled, this has no effect. 1815 1816config ZBOOT_ROM_BSS 1817 hex "Compressed ROM boot loader BSS address" 1818 default "0" 1819 help 1820 The base address of an area of read/write memory in the target 1821 for the ROM-able zImage which must be available while the 1822 decompressor is running. It must be large enough to hold the 1823 entire decompressed kernel plus an additional 128 KiB. 1824 Platforms which normally make use of ROM-able zImage formats 1825 normally set this to a suitable value in their defconfig file. 1826 1827 If ZBOOT_ROM is not enabled, this has no effect. 1828 1829config ZBOOT_ROM 1830 bool "Compressed boot loader in ROM/flash" 1831 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1832 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1833 help 1834 Say Y here if you intend to execute your compressed kernel image 1835 (zImage) directly from ROM or flash. If unsure, say N. 1836 1837choice 1838 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)" 1839 depends on ZBOOT_ROM && ARCH_SH7372 1840 default ZBOOT_ROM_NONE 1841 help 1842 Include experimental SD/MMC loading code in the ROM-able zImage. 1843 With this enabled it is possible to write the ROM-able zImage 1844 kernel image to an MMC or SD card and boot the kernel straight 1845 from the reset vector. At reset the processor Mask ROM will load 1846 the first part of the ROM-able zImage which in turn loads the 1847 rest the kernel image to RAM. 1848 1849config ZBOOT_ROM_NONE 1850 bool "No SD/MMC loader in zImage (EXPERIMENTAL)" 1851 help 1852 Do not load image from SD or MMC 1853 1854config ZBOOT_ROM_MMCIF 1855 bool "Include MMCIF loader in zImage (EXPERIMENTAL)" 1856 help 1857 Load image from MMCIF hardware block. 1858 1859config ZBOOT_ROM_SH_MOBILE_SDHI 1860 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)" 1861 help 1862 Load image from SDHI hardware block 1863 1864endchoice 1865 1866config ARM_APPENDED_DTB 1867 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1868 depends on OF 1869 help 1870 With this option, the boot code will look for a device tree binary 1871 (DTB) appended to zImage 1872 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1873 1874 This is meant as a backward compatibility convenience for those 1875 systems with a bootloader that can't be upgraded to accommodate 1876 the documented boot protocol using a device tree. 1877 1878 Beware that there is very little in terms of protection against 1879 this option being confused by leftover garbage in memory that might 1880 look like a DTB header after a reboot if no actual DTB is appended 1881 to zImage. Do not leave this option active in a production kernel 1882 if you don't intend to always append a DTB. Proper passing of the 1883 location into r2 of a bootloader provided DTB is always preferable 1884 to this option. 1885 1886config ARM_ATAG_DTB_COMPAT 1887 bool "Supplement the appended DTB with traditional ATAG information" 1888 depends on ARM_APPENDED_DTB 1889 help 1890 Some old bootloaders can't be updated to a DTB capable one, yet 1891 they provide ATAGs with memory configuration, the ramdisk address, 1892 the kernel cmdline string, etc. Such information is dynamically 1893 provided by the bootloader and can't always be stored in a static 1894 DTB. To allow a device tree enabled kernel to be used with such 1895 bootloaders, this option allows zImage to extract the information 1896 from the ATAG list and store it at run time into the appended DTB. 1897 1898choice 1899 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1900 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1901 1902config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1903 bool "Use bootloader kernel arguments if available" 1904 help 1905 Uses the command-line options passed by the boot loader instead of 1906 the device tree bootargs property. If the boot loader doesn't provide 1907 any, the device tree bootargs property will be used. 1908 1909config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1910 bool "Extend with bootloader kernel arguments" 1911 help 1912 The command-line arguments provided by the boot loader will be 1913 appended to the the device tree bootargs property. 1914 1915endchoice 1916 1917config CMDLINE 1918 string "Default kernel command string" 1919 default "" 1920 help 1921 On some architectures (EBSA110 and CATS), there is currently no way 1922 for the boot loader to pass arguments to the kernel. For these 1923 architectures, you should supply some command-line options at build 1924 time by entering them here. As a minimum, you should specify the 1925 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1926 1927choice 1928 prompt "Kernel command line type" if CMDLINE != "" 1929 default CMDLINE_FROM_BOOTLOADER 1930 depends on ATAGS 1931 1932config CMDLINE_FROM_BOOTLOADER 1933 bool "Use bootloader kernel arguments if available" 1934 help 1935 Uses the command-line options passed by the boot loader. If 1936 the boot loader doesn't provide any, the default kernel command 1937 string provided in CMDLINE will be used. 1938 1939config CMDLINE_EXTEND 1940 bool "Extend bootloader kernel arguments" 1941 help 1942 The command-line arguments provided by the boot loader will be 1943 appended to the default kernel command string. 1944 1945config CMDLINE_FORCE 1946 bool "Always use the default kernel command string" 1947 help 1948 Always use the default kernel command string, even if the boot 1949 loader passes other arguments to the kernel. 1950 This is useful if you cannot or don't want to change the 1951 command-line options your boot loader passes to the kernel. 1952endchoice 1953 1954config XIP_KERNEL 1955 bool "Kernel Execute-In-Place from ROM" 1956 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1957 help 1958 Execute-In-Place allows the kernel to run from non-volatile storage 1959 directly addressable by the CPU, such as NOR flash. This saves RAM 1960 space since the text section of the kernel is not loaded from flash 1961 to RAM. Read-write sections, such as the data section and stack, 1962 are still copied to RAM. The XIP kernel is not compressed since 1963 it has to run directly from flash, so it will take more space to 1964 store it. The flash address used to link the kernel object files, 1965 and for storing it, is configuration dependent. Therefore, if you 1966 say Y here, you must know the proper physical address where to 1967 store the kernel image depending on your own flash memory usage. 1968 1969 Also note that the make target becomes "make xipImage" rather than 1970 "make zImage" or "make Image". The final kernel binary to put in 1971 ROM memory will be arch/arm/boot/xipImage. 1972 1973 If unsure, say N. 1974 1975config XIP_PHYS_ADDR 1976 hex "XIP Kernel Physical Location" 1977 depends on XIP_KERNEL 1978 default "0x00080000" 1979 help 1980 This is the physical address in your flash memory the kernel will 1981 be linked for and stored to. This address is dependent on your 1982 own flash usage. 1983 1984config KEXEC 1985 bool "Kexec system call (EXPERIMENTAL)" 1986 depends on (!SMP || PM_SLEEP_SMP) 1987 select CRYPTO 1988 select CRYPTO_SHA256 1989 help 1990 kexec is a system call that implements the ability to shutdown your 1991 current kernel, and to start another kernel. It is like a reboot 1992 but it is independent of the system firmware. And like a reboot 1993 you can start any kernel with it, not just Linux. 1994 1995 It is an ongoing process to be certain the hardware in a machine 1996 is properly shutdown, so do not be surprised if this code does not 1997 initially work for you. 1998 1999config ATAGS_PROC 2000 bool "Export atags in procfs" 2001 depends on ATAGS && KEXEC 2002 default y 2003 help 2004 Should the atags used to boot the kernel be exported in an "atags" 2005 file in procfs. Useful with kexec. 2006 2007config CRASH_DUMP 2008 bool "Build kdump crash kernel (EXPERIMENTAL)" 2009 help 2010 Generate crash dump after being started by kexec. This should 2011 be normally only set in special crash dump kernels which are 2012 loaded in the main kernel with kexec-tools into a specially 2013 reserved region and then later executed after a crash by 2014 kdump/kexec. The crash dump kernel must be compiled to a 2015 memory address not used by the main kernel 2016 2017 For more details see Documentation/kdump/kdump.txt 2018 2019config AUTO_ZRELADDR 2020 bool "Auto calculation of the decompressed kernel image address" 2021 help 2022 ZRELADDR is the physical address where the decompressed kernel 2023 image will be placed. If AUTO_ZRELADDR is selected, the address 2024 will be determined at run-time by masking the current IP with 2025 0xf8000000. This assumes the zImage being placed in the first 128MB 2026 from start of memory. 2027 2028endmenu 2029 2030menu "CPU Power Management" 2031 2032source "drivers/cpufreq/Kconfig" 2033 2034source "drivers/cpuidle/Kconfig" 2035 2036endmenu 2037 2038menu "Floating point emulation" 2039 2040comment "At least one emulation must be selected" 2041 2042config FPE_NWFPE 2043 bool "NWFPE math emulation" 2044 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2045 ---help--- 2046 Say Y to include the NWFPE floating point emulator in the kernel. 2047 This is necessary to run most binaries. Linux does not currently 2048 support floating point hardware so you need to say Y here even if 2049 your machine has an FPA or floating point co-processor podule. 2050 2051 You may say N here if you are going to load the Acorn FPEmulator 2052 early in the bootup. 2053 2054config FPE_NWFPE_XP 2055 bool "Support extended precision" 2056 depends on FPE_NWFPE 2057 help 2058 Say Y to include 80-bit support in the kernel floating-point 2059 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2060 Note that gcc does not generate 80-bit operations by default, 2061 so in most cases this option only enlarges the size of the 2062 floating point emulator without any good reason. 2063 2064 You almost surely want to say N here. 2065 2066config FPE_FASTFPE 2067 bool "FastFPE math emulation (EXPERIMENTAL)" 2068 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2069 ---help--- 2070 Say Y here to include the FAST floating point emulator in the kernel. 2071 This is an experimental much faster emulator which now also has full 2072 precision for the mantissa. It does not support any exceptions. 2073 It is very simple, and approximately 3-6 times faster than NWFPE. 2074 2075 It should be sufficient for most programs. It may be not suitable 2076 for scientific calculations, but you have to check this for yourself. 2077 If you do not feel you need a faster FP emulation you should better 2078 choose NWFPE. 2079 2080config VFP 2081 bool "VFP-format floating point maths" 2082 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2083 help 2084 Say Y to include VFP support code in the kernel. This is needed 2085 if your hardware includes a VFP unit. 2086 2087 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2088 release notes and additional status information. 2089 2090 Say N if your target does not have VFP hardware. 2091 2092config VFPv3 2093 bool 2094 depends on VFP 2095 default y if CPU_V7 2096 2097config NEON 2098 bool "Advanced SIMD (NEON) Extension support" 2099 depends on VFPv3 && CPU_V7 2100 help 2101 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2102 Extension. 2103 2104config KERNEL_MODE_NEON 2105 bool "Support for NEON in kernel mode" 2106 depends on NEON && AEABI 2107 help 2108 Say Y to include support for NEON in kernel mode. 2109 2110endmenu 2111 2112menu "Userspace binary formats" 2113 2114source "fs/Kconfig.binfmt" 2115 2116config ARTHUR 2117 tristate "RISC OS personality" 2118 depends on !AEABI 2119 help 2120 Say Y here to include the kernel code necessary if you want to run 2121 Acorn RISC OS/Arthur binaries under Linux. This code is still very 2122 experimental; if this sounds frightening, say N and sleep in peace. 2123 You can also say M here to compile this support as a module (which 2124 will be called arthur). 2125 2126endmenu 2127 2128menu "Power management options" 2129 2130source "kernel/power/Kconfig" 2131 2132config ARCH_SUSPEND_POSSIBLE 2133 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 2134 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2135 def_bool y 2136 2137config ARM_CPU_SUSPEND 2138 def_bool PM_SLEEP 2139 2140config ARCH_HIBERNATION_POSSIBLE 2141 bool 2142 depends on MMU 2143 default y if ARCH_SUSPEND_POSSIBLE 2144 2145endmenu 2146 2147source "net/Kconfig" 2148 2149source "drivers/Kconfig" 2150 2151source "fs/Kconfig" 2152 2153source "arch/arm/Kconfig.debug" 2154 2155source "security/Kconfig" 2156 2157source "crypto/Kconfig" 2158 2159source "lib/Kconfig" 2160 2161source "arch/arm/kvm/Kconfig" 2162