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