1config ARM 2 bool 3 default y 4 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 5 select ARCH_HAS_ELF_RANDOMIZE 6 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 7 select ARCH_HAVE_CUSTOM_GPIO_H 8 select ARCH_HAS_GCOV_PROFILE_ALL 9 select ARCH_MIGHT_HAVE_PC_PARPORT 10 select ARCH_SUPPORTS_ATOMIC_RMW 11 select ARCH_USE_BUILTIN_BSWAP 12 select ARCH_USE_CMPXCHG_LOCKREF 13 select ARCH_WANT_IPC_PARSE_VERSION 14 select BUILDTIME_EXTABLE_SORT if MMU 15 select CLONE_BACKWARDS 16 select CPU_PM if (SUSPEND || CPU_IDLE) 17 select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS 18 select GENERIC_ALLOCATOR 19 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI) 20 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 21 select GENERIC_IDLE_POLL_SETUP 22 select GENERIC_IRQ_PROBE 23 select GENERIC_IRQ_SHOW 24 select GENERIC_IRQ_SHOW_LEVEL 25 select GENERIC_PCI_IOMAP 26 select GENERIC_SCHED_CLOCK 27 select GENERIC_SMP_IDLE_THREAD 28 select GENERIC_STRNCPY_FROM_USER 29 select GENERIC_STRNLEN_USER 30 select HANDLE_DOMAIN_IRQ 31 select HARDIRQS_SW_RESEND 32 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT) 33 select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 34 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 35 select HAVE_ARCH_KGDB 36 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) 37 select HAVE_ARCH_TRACEHOOK 38 select HAVE_BPF_JIT 39 select HAVE_CC_STACKPROTECTOR 40 select HAVE_CONTEXT_TRACKING 41 select HAVE_C_RECORDMCOUNT 42 select HAVE_DEBUG_KMEMLEAK 43 select HAVE_DMA_API_DEBUG 44 select HAVE_DMA_ATTRS 45 select HAVE_DMA_CONTIGUOUS if MMU 46 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) 47 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU 48 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL) 49 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL) 50 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL) 51 select HAVE_GENERIC_DMA_COHERENT 52 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)) 53 select HAVE_IDE if PCI || ISA || PCMCIA 54 select HAVE_IRQ_TIME_ACCOUNTING 55 select HAVE_KERNEL_GZIP 56 select HAVE_KERNEL_LZ4 57 select HAVE_KERNEL_LZMA 58 select HAVE_KERNEL_LZO 59 select HAVE_KERNEL_XZ 60 select HAVE_KPROBES if !XIP_KERNEL 61 select HAVE_KRETPROBES if (HAVE_KPROBES) 62 select HAVE_MEMBLOCK 63 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND 64 select HAVE_OPROFILE if (HAVE_PERF_EVENTS) 65 select HAVE_OPTPROBES if !THUMB2_KERNEL 66 select HAVE_PERF_EVENTS 67 select HAVE_PERF_REGS 68 select HAVE_PERF_USER_STACK_DUMP 69 select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE) 70 select HAVE_REGS_AND_STACK_ACCESS_API 71 select HAVE_SYSCALL_TRACEPOINTS 72 select HAVE_UID16 73 select HAVE_VIRT_CPU_ACCOUNTING_GEN 74 select IRQ_FORCED_THREADING 75 select MODULES_USE_ELF_REL 76 select NO_BOOTMEM 77 select OLD_SIGACTION 78 select OLD_SIGSUSPEND3 79 select PERF_USE_VMALLOC 80 select RTC_LIB 81 select SYS_SUPPORTS_APM_EMULATION 82 # Above selects are sorted alphabetically; please add new ones 83 # according to that. Thanks. 84 help 85 The ARM series is a line of low-power-consumption RISC chip designs 86 licensed by ARM Ltd and targeted at embedded applications and 87 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 88 manufactured, but legacy ARM-based PC hardware remains popular in 89 Europe. There is an ARM Linux project with a web page at 90 <http://www.arm.linux.org.uk/>. 91 92config ARM_HAS_SG_CHAIN 93 select ARCH_HAS_SG_CHAIN 94 bool 95 96config NEED_SG_DMA_LENGTH 97 bool 98 99config ARM_DMA_USE_IOMMU 100 bool 101 select ARM_HAS_SG_CHAIN 102 select NEED_SG_DMA_LENGTH 103 104if ARM_DMA_USE_IOMMU 105 106config ARM_DMA_IOMMU_ALIGNMENT 107 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" 108 range 4 9 109 default 8 110 help 111 DMA mapping framework by default aligns all buffers to the smallest 112 PAGE_SIZE order which is greater than or equal to the requested buffer 113 size. This works well for buffers up to a few hundreds kilobytes, but 114 for larger buffers it just a waste of address space. Drivers which has 115 relatively small addressing window (like 64Mib) might run out of 116 virtual space with just a few allocations. 117 118 With this parameter you can specify the maximum PAGE_SIZE order for 119 DMA IOMMU buffers. Larger buffers will be aligned only to this 120 specified order. The order is expressed as a power of two multiplied 121 by the PAGE_SIZE. 122 123endif 124 125config MIGHT_HAVE_PCI 126 bool 127 128config SYS_SUPPORTS_APM_EMULATION 129 bool 130 131config HAVE_TCM 132 bool 133 select GENERIC_ALLOCATOR 134 135config HAVE_PROC_CPU 136 bool 137 138config NO_IOPORT_MAP 139 bool 140 141config EISA 142 bool 143 ---help--- 144 The Extended Industry Standard Architecture (EISA) bus was 145 developed as an open alternative to the IBM MicroChannel bus. 146 147 The EISA bus provided some of the features of the IBM MicroChannel 148 bus while maintaining backward compatibility with cards made for 149 the older ISA bus. The EISA bus saw limited use between 1988 and 150 1995 when it was made obsolete by the PCI bus. 151 152 Say Y here if you are building a kernel for an EISA-based machine. 153 154 Otherwise, say N. 155 156config SBUS 157 bool 158 159config STACKTRACE_SUPPORT 160 bool 161 default y 162 163config HAVE_LATENCYTOP_SUPPORT 164 bool 165 depends on !SMP 166 default y 167 168config LOCKDEP_SUPPORT 169 bool 170 default y 171 172config TRACE_IRQFLAGS_SUPPORT 173 bool 174 default y 175 176config RWSEM_XCHGADD_ALGORITHM 177 bool 178 default y 179 180config ARCH_HAS_ILOG2_U32 181 bool 182 183config ARCH_HAS_ILOG2_U64 184 bool 185 186config ARCH_HAS_BANDGAP 187 bool 188 189config GENERIC_HWEIGHT 190 bool 191 default y 192 193config GENERIC_CALIBRATE_DELAY 194 bool 195 default y 196 197config ARCH_MAY_HAVE_PC_FDC 198 bool 199 200config ZONE_DMA 201 bool 202 203config NEED_DMA_MAP_STATE 204 def_bool y 205 206config ARCH_SUPPORTS_UPROBES 207 def_bool y 208 209config ARCH_HAS_DMA_SET_COHERENT_MASK 210 bool 211 212config GENERIC_ISA_DMA 213 bool 214 215config FIQ 216 bool 217 218config NEED_RET_TO_USER 219 bool 220 221config ARCH_MTD_XIP 222 bool 223 224config VECTORS_BASE 225 hex 226 default 0xffff0000 if MMU || CPU_HIGH_VECTOR 227 default DRAM_BASE if REMAP_VECTORS_TO_RAM 228 default 0x00000000 229 help 230 The base address of exception vectors. This must be two pages 231 in size. 232 233config ARM_PATCH_PHYS_VIRT 234 bool "Patch physical to virtual translations at runtime" if EMBEDDED 235 default y 236 depends on !XIP_KERNEL && MMU 237 depends on !ARCH_REALVIEW || !SPARSEMEM 238 help 239 Patch phys-to-virt and virt-to-phys translation functions at 240 boot and module load time according to the position of the 241 kernel in system memory. 242 243 This can only be used with non-XIP MMU kernels where the base 244 of physical memory is at a 16MB boundary. 245 246 Only disable this option if you know that you do not require 247 this feature (eg, building a kernel for a single machine) and 248 you need to shrink the kernel to the minimal size. 249 250config NEED_MACH_IO_H 251 bool 252 help 253 Select this when mach/io.h is required to provide special 254 definitions for this platform. The need for mach/io.h should 255 be avoided when possible. 256 257config NEED_MACH_MEMORY_H 258 bool 259 help 260 Select this when mach/memory.h is required to provide special 261 definitions for this platform. The need for mach/memory.h should 262 be avoided when possible. 263 264config PHYS_OFFSET 265 hex "Physical address of main memory" if MMU 266 depends on !ARM_PATCH_PHYS_VIRT 267 default DRAM_BASE if !MMU 268 default 0x00000000 if ARCH_EBSA110 || \ 269 EP93XX_SDCE3_SYNC_PHYS_OFFSET || \ 270 ARCH_FOOTBRIDGE || \ 271 ARCH_INTEGRATOR || \ 272 ARCH_IOP13XX || \ 273 ARCH_KS8695 || \ 274 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET) 275 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC 276 default 0x20000000 if ARCH_S5PV210 277 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET 278 default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100 279 default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET 280 default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET 281 default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET 282 help 283 Please provide the physical address corresponding to the 284 location of main memory in your system. 285 286config GENERIC_BUG 287 def_bool y 288 depends on BUG 289 290config PGTABLE_LEVELS 291 int 292 default 3 if ARM_LPAE 293 default 2 294 295source "init/Kconfig" 296 297source "kernel/Kconfig.freezer" 298 299menu "System Type" 300 301config MMU 302 bool "MMU-based Paged Memory Management Support" 303 default y 304 help 305 Select if you want MMU-based virtualised addressing space 306 support by paged memory management. If unsure, say 'Y'. 307 308# 309# The "ARM system type" choice list is ordered alphabetically by option 310# text. Please add new entries in the option alphabetic order. 311# 312choice 313 prompt "ARM system type" 314 default ARCH_VERSATILE if !MMU 315 default ARCH_MULTIPLATFORM if MMU 316 317config ARCH_MULTIPLATFORM 318 bool "Allow multiple platforms to be selected" 319 depends on MMU 320 select ARCH_WANT_OPTIONAL_GPIOLIB 321 select ARM_HAS_SG_CHAIN 322 select ARM_PATCH_PHYS_VIRT 323 select AUTO_ZRELADDR 324 select CLKSRC_OF 325 select COMMON_CLK 326 select GENERIC_CLOCKEVENTS 327 select MIGHT_HAVE_PCI 328 select MULTI_IRQ_HANDLER 329 select SPARSE_IRQ 330 select USE_OF 331 332config ARCH_REALVIEW 333 bool "ARM Ltd. RealView family" 334 select ARCH_WANT_OPTIONAL_GPIOLIB 335 select ARM_AMBA 336 select ARM_TIMER_SP804 337 select COMMON_CLK 338 select COMMON_CLK_VERSATILE 339 select GENERIC_CLOCKEVENTS 340 select GPIO_PL061 if GPIOLIB 341 select ICST 342 select NEED_MACH_MEMORY_H 343 select PLAT_VERSATILE 344 select PLAT_VERSATILE_SCHED_CLOCK 345 help 346 This enables support for ARM Ltd RealView boards. 347 348config ARCH_VERSATILE 349 bool "ARM Ltd. Versatile family" 350 select ARCH_WANT_OPTIONAL_GPIOLIB 351 select ARM_AMBA 352 select ARM_TIMER_SP804 353 select ARM_VIC 354 select CLKDEV_LOOKUP 355 select GENERIC_CLOCKEVENTS 356 select HAVE_MACH_CLKDEV 357 select ICST 358 select PLAT_VERSATILE 359 select PLAT_VERSATILE_CLOCK 360 select PLAT_VERSATILE_SCHED_CLOCK 361 select VERSATILE_FPGA_IRQ 362 help 363 This enables support for ARM Ltd Versatile board. 364 365config ARCH_AT91 366 bool "Atmel AT91" 367 select ARCH_REQUIRE_GPIOLIB 368 select CLKDEV_LOOKUP 369 select IRQ_DOMAIN 370 select PINCTRL 371 select PINCTRL_AT91 372 select SOC_BUS 373 select USE_OF 374 help 375 This enables support for systems based on Atmel 376 AT91RM9200, AT91SAM9 and SAMA5 processors. 377 378config ARCH_CLPS711X 379 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based" 380 select ARCH_REQUIRE_GPIOLIB 381 select AUTO_ZRELADDR 382 select CLKSRC_MMIO 383 select COMMON_CLK 384 select CPU_ARM720T 385 select GENERIC_CLOCKEVENTS 386 select MFD_SYSCON 387 select SOC_BUS 388 help 389 Support for Cirrus Logic 711x/721x/731x based boards. 390 391config ARCH_GEMINI 392 bool "Cortina Systems Gemini" 393 select ARCH_REQUIRE_GPIOLIB 394 select CLKSRC_MMIO 395 select CPU_FA526 396 select GENERIC_CLOCKEVENTS 397 help 398 Support for the Cortina Systems Gemini family SoCs 399 400config ARCH_EBSA110 401 bool "EBSA-110" 402 select ARCH_USES_GETTIMEOFFSET 403 select CPU_SA110 404 select ISA 405 select NEED_MACH_IO_H 406 select NEED_MACH_MEMORY_H 407 select NO_IOPORT_MAP 408 help 409 This is an evaluation board for the StrongARM processor available 410 from Digital. It has limited hardware on-board, including an 411 Ethernet interface, two PCMCIA sockets, two serial ports and a 412 parallel port. 413 414config ARCH_EFM32 415 bool "Energy Micro efm32" 416 depends on !MMU 417 select ARCH_REQUIRE_GPIOLIB 418 select ARM_NVIC 419 select AUTO_ZRELADDR 420 select CLKSRC_OF 421 select COMMON_CLK 422 select CPU_V7M 423 select GENERIC_CLOCKEVENTS 424 select NO_DMA 425 select NO_IOPORT_MAP 426 select SPARSE_IRQ 427 select USE_OF 428 help 429 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko 430 processors. 431 432config ARCH_EP93XX 433 bool "EP93xx-based" 434 select ARCH_HAS_HOLES_MEMORYMODEL 435 select ARCH_REQUIRE_GPIOLIB 436 select ARCH_USES_GETTIMEOFFSET 437 select ARM_AMBA 438 select ARM_VIC 439 select CLKDEV_LOOKUP 440 select CPU_ARM920T 441 help 442 This enables support for the Cirrus EP93xx series of CPUs. 443 444config ARCH_FOOTBRIDGE 445 bool "FootBridge" 446 select CPU_SA110 447 select FOOTBRIDGE 448 select GENERIC_CLOCKEVENTS 449 select HAVE_IDE 450 select NEED_MACH_IO_H if !MMU 451 select NEED_MACH_MEMORY_H 452 help 453 Support for systems based on the DC21285 companion chip 454 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 455 456config ARCH_NETX 457 bool "Hilscher NetX based" 458 select ARM_VIC 459 select CLKSRC_MMIO 460 select CPU_ARM926T 461 select GENERIC_CLOCKEVENTS 462 help 463 This enables support for systems based on the Hilscher NetX Soc 464 465config ARCH_IOP13XX 466 bool "IOP13xx-based" 467 depends on MMU 468 select CPU_XSC3 469 select NEED_MACH_MEMORY_H 470 select NEED_RET_TO_USER 471 select PCI 472 select PLAT_IOP 473 select VMSPLIT_1G 474 select SPARSE_IRQ 475 help 476 Support for Intel's IOP13XX (XScale) family of processors. 477 478config ARCH_IOP32X 479 bool "IOP32x-based" 480 depends on MMU 481 select ARCH_REQUIRE_GPIOLIB 482 select CPU_XSCALE 483 select GPIO_IOP 484 select NEED_RET_TO_USER 485 select PCI 486 select PLAT_IOP 487 help 488 Support for Intel's 80219 and IOP32X (XScale) family of 489 processors. 490 491config ARCH_IOP33X 492 bool "IOP33x-based" 493 depends on MMU 494 select ARCH_REQUIRE_GPIOLIB 495 select CPU_XSCALE 496 select GPIO_IOP 497 select NEED_RET_TO_USER 498 select PCI 499 select PLAT_IOP 500 help 501 Support for Intel's IOP33X (XScale) family of processors. 502 503config ARCH_IXP4XX 504 bool "IXP4xx-based" 505 depends on MMU 506 select ARCH_HAS_DMA_SET_COHERENT_MASK 507 select ARCH_REQUIRE_GPIOLIB 508 select ARCH_SUPPORTS_BIG_ENDIAN 509 select CLKSRC_MMIO 510 select CPU_XSCALE 511 select DMABOUNCE if PCI 512 select GENERIC_CLOCKEVENTS 513 select MIGHT_HAVE_PCI 514 select NEED_MACH_IO_H 515 select USB_EHCI_BIG_ENDIAN_DESC 516 select USB_EHCI_BIG_ENDIAN_MMIO 517 help 518 Support for Intel's IXP4XX (XScale) family of processors. 519 520config ARCH_DOVE 521 bool "Marvell Dove" 522 select ARCH_REQUIRE_GPIOLIB 523 select CPU_PJ4 524 select GENERIC_CLOCKEVENTS 525 select MIGHT_HAVE_PCI 526 select MVEBU_MBUS 527 select PINCTRL 528 select PINCTRL_DOVE 529 select PLAT_ORION_LEGACY 530 help 531 Support for the Marvell Dove SoC 88AP510 532 533config ARCH_MV78XX0 534 bool "Marvell MV78xx0" 535 select ARCH_REQUIRE_GPIOLIB 536 select CPU_FEROCEON 537 select GENERIC_CLOCKEVENTS 538 select MVEBU_MBUS 539 select PCI 540 select PLAT_ORION_LEGACY 541 help 542 Support for the following Marvell MV78xx0 series SoCs: 543 MV781x0, MV782x0. 544 545config ARCH_ORION5X 546 bool "Marvell Orion" 547 depends on MMU 548 select ARCH_REQUIRE_GPIOLIB 549 select CPU_FEROCEON 550 select GENERIC_CLOCKEVENTS 551 select MVEBU_MBUS 552 select PCI 553 select PLAT_ORION_LEGACY 554 help 555 Support for the following Marvell Orion 5x series SoCs: 556 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 557 Orion-2 (5281), Orion-1-90 (6183). 558 559config ARCH_MMP 560 bool "Marvell PXA168/910/MMP2" 561 depends on MMU 562 select ARCH_REQUIRE_GPIOLIB 563 select CLKDEV_LOOKUP 564 select GENERIC_ALLOCATOR 565 select GENERIC_CLOCKEVENTS 566 select GPIO_PXA 567 select IRQ_DOMAIN 568 select MULTI_IRQ_HANDLER 569 select PINCTRL 570 select PLAT_PXA 571 select SPARSE_IRQ 572 help 573 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 574 575config ARCH_KS8695 576 bool "Micrel/Kendin KS8695" 577 select ARCH_REQUIRE_GPIOLIB 578 select CLKSRC_MMIO 579 select CPU_ARM922T 580 select GENERIC_CLOCKEVENTS 581 select NEED_MACH_MEMORY_H 582 help 583 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 584 System-on-Chip devices. 585 586config ARCH_W90X900 587 bool "Nuvoton W90X900 CPU" 588 select ARCH_REQUIRE_GPIOLIB 589 select CLKDEV_LOOKUP 590 select CLKSRC_MMIO 591 select CPU_ARM926T 592 select GENERIC_CLOCKEVENTS 593 help 594 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 595 At present, the w90x900 has been renamed nuc900, regarding 596 the ARM series product line, you can login the following 597 link address to know more. 598 599 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 600 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 601 602config ARCH_LPC32XX 603 bool "NXP LPC32XX" 604 select ARCH_REQUIRE_GPIOLIB 605 select ARM_AMBA 606 select CLKDEV_LOOKUP 607 select CLKSRC_MMIO 608 select CPU_ARM926T 609 select GENERIC_CLOCKEVENTS 610 select HAVE_IDE 611 select USE_OF 612 help 613 Support for the NXP LPC32XX family of processors 614 615config ARCH_PXA 616 bool "PXA2xx/PXA3xx-based" 617 depends on MMU 618 select ARCH_MTD_XIP 619 select ARCH_REQUIRE_GPIOLIB 620 select ARM_CPU_SUSPEND if PM 621 select AUTO_ZRELADDR 622 select CLKDEV_LOOKUP 623 select CLKSRC_MMIO 624 select CLKSRC_OF 625 select GENERIC_CLOCKEVENTS 626 select GPIO_PXA 627 select HAVE_IDE 628 select IRQ_DOMAIN 629 select MULTI_IRQ_HANDLER 630 select PLAT_PXA 631 select SPARSE_IRQ 632 help 633 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 634 635config ARCH_SHMOBILE_LEGACY 636 bool "Renesas ARM SoCs (non-multiplatform)" 637 select ARCH_SHMOBILE 638 select ARM_PATCH_PHYS_VIRT if MMU 639 select CLKDEV_LOOKUP 640 select CPU_V7 641 select GENERIC_CLOCKEVENTS 642 select HAVE_ARM_SCU if SMP 643 select HAVE_ARM_TWD if SMP 644 select HAVE_MACH_CLKDEV 645 select HAVE_SMP 646 select MIGHT_HAVE_CACHE_L2X0 647 select MULTI_IRQ_HANDLER 648 select NO_IOPORT_MAP 649 select PINCTRL 650 select PM_GENERIC_DOMAINS if PM 651 select SH_CLK_CPG 652 select SPARSE_IRQ 653 help 654 Support for Renesas ARM SoC platforms using a non-multiplatform 655 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car 656 and RZ families. 657 658config ARCH_RPC 659 bool "RiscPC" 660 select ARCH_ACORN 661 select ARCH_MAY_HAVE_PC_FDC 662 select ARCH_SPARSEMEM_ENABLE 663 select ARCH_USES_GETTIMEOFFSET 664 select CPU_SA110 665 select FIQ 666 select HAVE_IDE 667 select HAVE_PATA_PLATFORM 668 select ISA_DMA_API 669 select NEED_MACH_IO_H 670 select NEED_MACH_MEMORY_H 671 select NO_IOPORT_MAP 672 select VIRT_TO_BUS 673 help 674 On the Acorn Risc-PC, Linux can support the internal IDE disk and 675 CD-ROM interface, serial and parallel port, and the floppy drive. 676 677config ARCH_SA1100 678 bool "SA1100-based" 679 select ARCH_MTD_XIP 680 select ARCH_REQUIRE_GPIOLIB 681 select ARCH_SPARSEMEM_ENABLE 682 select CLKDEV_LOOKUP 683 select CLKSRC_MMIO 684 select CPU_FREQ 685 select CPU_SA1100 686 select GENERIC_CLOCKEVENTS 687 select HAVE_IDE 688 select IRQ_DOMAIN 689 select ISA 690 select MULTI_IRQ_HANDLER 691 select NEED_MACH_MEMORY_H 692 select SPARSE_IRQ 693 help 694 Support for StrongARM 11x0 based boards. 695 696config ARCH_S3C24XX 697 bool "Samsung S3C24XX SoCs" 698 select ARCH_REQUIRE_GPIOLIB 699 select ATAGS 700 select CLKDEV_LOOKUP 701 select CLKSRC_SAMSUNG_PWM 702 select GENERIC_CLOCKEVENTS 703 select GPIO_SAMSUNG 704 select HAVE_S3C2410_I2C if I2C 705 select HAVE_S3C2410_WATCHDOG if WATCHDOG 706 select HAVE_S3C_RTC if RTC_CLASS 707 select MULTI_IRQ_HANDLER 708 select NEED_MACH_IO_H 709 select SAMSUNG_ATAGS 710 help 711 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 712 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 713 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 714 Samsung SMDK2410 development board (and derivatives). 715 716config ARCH_S3C64XX 717 bool "Samsung S3C64XX" 718 select ARCH_REQUIRE_GPIOLIB 719 select ARM_AMBA 720 select ARM_VIC 721 select ATAGS 722 select CLKDEV_LOOKUP 723 select CLKSRC_SAMSUNG_PWM 724 select COMMON_CLK_SAMSUNG 725 select CPU_V6K 726 select GENERIC_CLOCKEVENTS 727 select GPIO_SAMSUNG 728 select HAVE_S3C2410_I2C if I2C 729 select HAVE_S3C2410_WATCHDOG if WATCHDOG 730 select HAVE_TCM 731 select NO_IOPORT_MAP 732 select PLAT_SAMSUNG 733 select PM_GENERIC_DOMAINS if PM 734 select S3C_DEV_NAND 735 select S3C_GPIO_TRACK 736 select SAMSUNG_ATAGS 737 select SAMSUNG_WAKEMASK 738 select SAMSUNG_WDT_RESET 739 help 740 Samsung S3C64XX series based systems 741 742config ARCH_DAVINCI 743 bool "TI DaVinci" 744 select ARCH_HAS_HOLES_MEMORYMODEL 745 select ARCH_REQUIRE_GPIOLIB 746 select CLKDEV_LOOKUP 747 select GENERIC_ALLOCATOR 748 select GENERIC_CLOCKEVENTS 749 select GENERIC_IRQ_CHIP 750 select HAVE_IDE 751 select TI_PRIV_EDMA 752 select USE_OF 753 select ZONE_DMA 754 help 755 Support for TI's DaVinci platform. 756 757config ARCH_OMAP1 758 bool "TI OMAP1" 759 depends on MMU 760 select ARCH_HAS_HOLES_MEMORYMODEL 761 select ARCH_OMAP 762 select ARCH_REQUIRE_GPIOLIB 763 select CLKDEV_LOOKUP 764 select CLKSRC_MMIO 765 select GENERIC_CLOCKEVENTS 766 select GENERIC_IRQ_CHIP 767 select HAVE_IDE 768 select IRQ_DOMAIN 769 select NEED_MACH_IO_H if PCCARD 770 select NEED_MACH_MEMORY_H 771 help 772 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 773 774endchoice 775 776menu "Multiple platform selection" 777 depends on ARCH_MULTIPLATFORM 778 779comment "CPU Core family selection" 780 781config ARCH_MULTI_V4 782 bool "ARMv4 based platforms (FA526)" 783 depends on !ARCH_MULTI_V6_V7 784 select ARCH_MULTI_V4_V5 785 select CPU_FA526 786 787config ARCH_MULTI_V4T 788 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 789 depends on !ARCH_MULTI_V6_V7 790 select ARCH_MULTI_V4_V5 791 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 792 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 793 CPU_ARM925T || CPU_ARM940T) 794 795config ARCH_MULTI_V5 796 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 797 depends on !ARCH_MULTI_V6_V7 798 select ARCH_MULTI_V4_V5 799 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 800 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 801 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 802 803config ARCH_MULTI_V4_V5 804 bool 805 806config ARCH_MULTI_V6 807 bool "ARMv6 based platforms (ARM11)" 808 select ARCH_MULTI_V6_V7 809 select CPU_V6K 810 811config ARCH_MULTI_V7 812 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 813 default y 814 select ARCH_MULTI_V6_V7 815 select CPU_V7 816 select HAVE_SMP 817 818config ARCH_MULTI_V6_V7 819 bool 820 select MIGHT_HAVE_CACHE_L2X0 821 822config ARCH_MULTI_CPU_AUTO 823 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 824 select ARCH_MULTI_V5 825 826endmenu 827 828config ARCH_VIRT 829 bool "Dummy Virtual Machine" if ARCH_MULTI_V7 830 select ARM_AMBA 831 select ARM_GIC 832 select ARM_PSCI 833 select HAVE_ARM_ARCH_TIMER 834 835# 836# This is sorted alphabetically by mach-* pathname. However, plat-* 837# Kconfigs may be included either alphabetically (according to the 838# plat- suffix) or along side the corresponding mach-* source. 839# 840source "arch/arm/mach-mvebu/Kconfig" 841 842source "arch/arm/mach-alpine/Kconfig" 843 844source "arch/arm/mach-asm9260/Kconfig" 845 846source "arch/arm/mach-at91/Kconfig" 847 848source "arch/arm/mach-axxia/Kconfig" 849 850source "arch/arm/mach-bcm/Kconfig" 851 852source "arch/arm/mach-berlin/Kconfig" 853 854source "arch/arm/mach-clps711x/Kconfig" 855 856source "arch/arm/mach-cns3xxx/Kconfig" 857 858source "arch/arm/mach-davinci/Kconfig" 859 860source "arch/arm/mach-digicolor/Kconfig" 861 862source "arch/arm/mach-dove/Kconfig" 863 864source "arch/arm/mach-ep93xx/Kconfig" 865 866source "arch/arm/mach-footbridge/Kconfig" 867 868source "arch/arm/mach-gemini/Kconfig" 869 870source "arch/arm/mach-highbank/Kconfig" 871 872source "arch/arm/mach-hisi/Kconfig" 873 874source "arch/arm/mach-integrator/Kconfig" 875 876source "arch/arm/mach-iop32x/Kconfig" 877 878source "arch/arm/mach-iop33x/Kconfig" 879 880source "arch/arm/mach-iop13xx/Kconfig" 881 882source "arch/arm/mach-ixp4xx/Kconfig" 883 884source "arch/arm/mach-keystone/Kconfig" 885 886source "arch/arm/mach-ks8695/Kconfig" 887 888source "arch/arm/mach-meson/Kconfig" 889 890source "arch/arm/mach-moxart/Kconfig" 891 892source "arch/arm/mach-mv78xx0/Kconfig" 893 894source "arch/arm/mach-imx/Kconfig" 895 896source "arch/arm/mach-mediatek/Kconfig" 897 898source "arch/arm/mach-mxs/Kconfig" 899 900source "arch/arm/mach-netx/Kconfig" 901 902source "arch/arm/mach-nomadik/Kconfig" 903 904source "arch/arm/mach-nspire/Kconfig" 905 906source "arch/arm/plat-omap/Kconfig" 907 908source "arch/arm/mach-omap1/Kconfig" 909 910source "arch/arm/mach-omap2/Kconfig" 911 912source "arch/arm/mach-orion5x/Kconfig" 913 914source "arch/arm/mach-picoxcell/Kconfig" 915 916source "arch/arm/mach-pxa/Kconfig" 917source "arch/arm/plat-pxa/Kconfig" 918 919source "arch/arm/mach-mmp/Kconfig" 920 921source "arch/arm/mach-qcom/Kconfig" 922 923source "arch/arm/mach-realview/Kconfig" 924 925source "arch/arm/mach-rockchip/Kconfig" 926 927source "arch/arm/mach-sa1100/Kconfig" 928 929source "arch/arm/mach-socfpga/Kconfig" 930 931source "arch/arm/mach-spear/Kconfig" 932 933source "arch/arm/mach-sti/Kconfig" 934 935source "arch/arm/mach-s3c24xx/Kconfig" 936 937source "arch/arm/mach-s3c64xx/Kconfig" 938 939source "arch/arm/mach-s5pv210/Kconfig" 940 941source "arch/arm/mach-exynos/Kconfig" 942source "arch/arm/plat-samsung/Kconfig" 943 944source "arch/arm/mach-shmobile/Kconfig" 945 946source "arch/arm/mach-sunxi/Kconfig" 947 948source "arch/arm/mach-prima2/Kconfig" 949 950source "arch/arm/mach-tegra/Kconfig" 951 952source "arch/arm/mach-u300/Kconfig" 953 954source "arch/arm/mach-ux500/Kconfig" 955 956source "arch/arm/mach-versatile/Kconfig" 957 958source "arch/arm/mach-vexpress/Kconfig" 959source "arch/arm/plat-versatile/Kconfig" 960 961source "arch/arm/mach-vt8500/Kconfig" 962 963source "arch/arm/mach-w90x900/Kconfig" 964 965source "arch/arm/mach-zynq/Kconfig" 966 967# Definitions to make life easier 968config ARCH_ACORN 969 bool 970 971config PLAT_IOP 972 bool 973 select GENERIC_CLOCKEVENTS 974 975config PLAT_ORION 976 bool 977 select CLKSRC_MMIO 978 select COMMON_CLK 979 select GENERIC_IRQ_CHIP 980 select IRQ_DOMAIN 981 982config PLAT_ORION_LEGACY 983 bool 984 select PLAT_ORION 985 986config PLAT_PXA 987 bool 988 989config PLAT_VERSATILE 990 bool 991 992config ARM_TIMER_SP804 993 bool 994 select CLKSRC_MMIO 995 select CLKSRC_OF if OF 996 997source "arch/arm/firmware/Kconfig" 998 999source arch/arm/mm/Kconfig 1000 1001config IWMMXT 1002 bool "Enable iWMMXt support" 1003 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 1004 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 1005 help 1006 Enable support for iWMMXt context switching at run time if 1007 running on a CPU that supports it. 1008 1009config MULTI_IRQ_HANDLER 1010 bool 1011 help 1012 Allow each machine to specify it's own IRQ handler at run time. 1013 1014if !MMU 1015source "arch/arm/Kconfig-nommu" 1016endif 1017 1018config PJ4B_ERRATA_4742 1019 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1020 depends on CPU_PJ4B && MACH_ARMADA_370 1021 default y 1022 help 1023 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1024 Event (WFE) IDLE states, a specific timing sensitivity exists between 1025 the retiring WFI/WFE instructions and the newly issued subsequent 1026 instructions. This sensitivity can result in a CPU hang scenario. 1027 Workaround: 1028 The software must insert either a Data Synchronization Barrier (DSB) 1029 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1030 instruction 1031 1032config ARM_ERRATA_326103 1033 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1034 depends on CPU_V6 1035 help 1036 Executing a SWP instruction to read-only memory does not set bit 11 1037 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1038 treat the access as a read, preventing a COW from occurring and 1039 causing the faulting task to livelock. 1040 1041config ARM_ERRATA_411920 1042 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1043 depends on CPU_V6 || CPU_V6K 1044 help 1045 Invalidation of the Instruction Cache operation can 1046 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1047 It does not affect the MPCore. This option enables the ARM Ltd. 1048 recommended workaround. 1049 1050config ARM_ERRATA_430973 1051 bool "ARM errata: Stale prediction on replaced interworking branch" 1052 depends on CPU_V7 1053 help 1054 This option enables the workaround for the 430973 Cortex-A8 1055 r1p* erratum. If a code sequence containing an ARM/Thumb 1056 interworking branch is replaced with another code sequence at the 1057 same virtual address, whether due to self-modifying code or virtual 1058 to physical address re-mapping, Cortex-A8 does not recover from the 1059 stale interworking branch prediction. This results in Cortex-A8 1060 executing the new code sequence in the incorrect ARM or Thumb state. 1061 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1062 and also flushes the branch target cache at every context switch. 1063 Note that setting specific bits in the ACTLR register may not be 1064 available in non-secure mode. 1065 1066config ARM_ERRATA_458693 1067 bool "ARM errata: Processor deadlock when a false hazard is created" 1068 depends on CPU_V7 1069 depends on !ARCH_MULTIPLATFORM 1070 help 1071 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1072 erratum. For very specific sequences of memory operations, it is 1073 possible for a hazard condition intended for a cache line to instead 1074 be incorrectly associated with a different cache line. This false 1075 hazard might then cause a processor deadlock. The workaround enables 1076 the L1 caching of the NEON accesses and disables the PLD instruction 1077 in the ACTLR register. Note that setting specific bits in the ACTLR 1078 register may not be available in non-secure mode. 1079 1080config ARM_ERRATA_460075 1081 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1082 depends on CPU_V7 1083 depends on !ARCH_MULTIPLATFORM 1084 help 1085 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1086 erratum. Any asynchronous access to the L2 cache may encounter a 1087 situation in which recent store transactions to the L2 cache are lost 1088 and overwritten with stale memory contents from external memory. The 1089 workaround disables the write-allocate mode for the L2 cache via the 1090 ACTLR register. Note that setting specific bits in the ACTLR register 1091 may not be available in non-secure mode. 1092 1093config ARM_ERRATA_742230 1094 bool "ARM errata: DMB operation may be faulty" 1095 depends on CPU_V7 && SMP 1096 depends on !ARCH_MULTIPLATFORM 1097 help 1098 This option enables the workaround for the 742230 Cortex-A9 1099 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1100 between two write operations may not ensure the correct visibility 1101 ordering of the two writes. This workaround sets a specific bit in 1102 the diagnostic register of the Cortex-A9 which causes the DMB 1103 instruction to behave as a DSB, ensuring the correct behaviour of 1104 the two writes. 1105 1106config ARM_ERRATA_742231 1107 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1108 depends on CPU_V7 && SMP 1109 depends on !ARCH_MULTIPLATFORM 1110 help 1111 This option enables the workaround for the 742231 Cortex-A9 1112 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1113 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1114 accessing some data located in the same cache line, may get corrupted 1115 data due to bad handling of the address hazard when the line gets 1116 replaced from one of the CPUs at the same time as another CPU is 1117 accessing it. This workaround sets specific bits in the diagnostic 1118 register of the Cortex-A9 which reduces the linefill issuing 1119 capabilities of the processor. 1120 1121config ARM_ERRATA_643719 1122 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1123 depends on CPU_V7 && SMP 1124 default y 1125 help 1126 This option enables the workaround for the 643719 Cortex-A9 (prior to 1127 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1128 register returns zero when it should return one. The workaround 1129 corrects this value, ensuring cache maintenance operations which use 1130 it behave as intended and avoiding data corruption. 1131 1132config ARM_ERRATA_720789 1133 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1134 depends on CPU_V7 1135 help 1136 This option enables the workaround for the 720789 Cortex-A9 (prior to 1137 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1138 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1139 As a consequence of this erratum, some TLB entries which should be 1140 invalidated are not, resulting in an incoherency in the system page 1141 tables. The workaround changes the TLB flushing routines to invalidate 1142 entries regardless of the ASID. 1143 1144config ARM_ERRATA_743622 1145 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1146 depends on CPU_V7 1147 depends on !ARCH_MULTIPLATFORM 1148 help 1149 This option enables the workaround for the 743622 Cortex-A9 1150 (r2p*) erratum. Under very rare conditions, a faulty 1151 optimisation in the Cortex-A9 Store Buffer may lead to data 1152 corruption. This workaround sets a specific bit in the diagnostic 1153 register of the Cortex-A9 which disables the Store Buffer 1154 optimisation, preventing the defect from occurring. This has no 1155 visible impact on the overall performance or power consumption of the 1156 processor. 1157 1158config ARM_ERRATA_751472 1159 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1160 depends on CPU_V7 1161 depends on !ARCH_MULTIPLATFORM 1162 help 1163 This option enables the workaround for the 751472 Cortex-A9 (prior 1164 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1165 completion of a following broadcasted operation if the second 1166 operation is received by a CPU before the ICIALLUIS has completed, 1167 potentially leading to corrupted entries in the cache or TLB. 1168 1169config ARM_ERRATA_754322 1170 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1171 depends on CPU_V7 1172 help 1173 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1174 r3p*) erratum. A speculative memory access may cause a page table walk 1175 which starts prior to an ASID switch but completes afterwards. This 1176 can populate the micro-TLB with a stale entry which may be hit with 1177 the new ASID. This workaround places two dsb instructions in the mm 1178 switching code so that no page table walks can cross the ASID switch. 1179 1180config ARM_ERRATA_754327 1181 bool "ARM errata: no automatic Store Buffer drain" 1182 depends on CPU_V7 && SMP 1183 help 1184 This option enables the workaround for the 754327 Cortex-A9 (prior to 1185 r2p0) erratum. The Store Buffer does not have any automatic draining 1186 mechanism and therefore a livelock may occur if an external agent 1187 continuously polls a memory location waiting to observe an update. 1188 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1189 written polling loops from denying visibility of updates to memory. 1190 1191config ARM_ERRATA_364296 1192 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1193 depends on CPU_V6 1194 help 1195 This options enables the workaround for the 364296 ARM1136 1196 r0p2 erratum (possible cache data corruption with 1197 hit-under-miss enabled). It sets the undocumented bit 31 in 1198 the auxiliary control register and the FI bit in the control 1199 register, thus disabling hit-under-miss without putting the 1200 processor into full low interrupt latency mode. ARM11MPCore 1201 is not affected. 1202 1203config ARM_ERRATA_764369 1204 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1205 depends on CPU_V7 && SMP 1206 help 1207 This option enables the workaround for erratum 764369 1208 affecting Cortex-A9 MPCore with two or more processors (all 1209 current revisions). Under certain timing circumstances, a data 1210 cache line maintenance operation by MVA targeting an Inner 1211 Shareable memory region may fail to proceed up to either the 1212 Point of Coherency or to the Point of Unification of the 1213 system. This workaround adds a DSB instruction before the 1214 relevant cache maintenance functions and sets a specific bit 1215 in the diagnostic control register of the SCU. 1216 1217config ARM_ERRATA_775420 1218 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1219 depends on CPU_V7 1220 help 1221 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1222 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1223 operation aborts with MMU exception, it might cause the processor 1224 to deadlock. This workaround puts DSB before executing ISB if 1225 an abort may occur on cache maintenance. 1226 1227config ARM_ERRATA_798181 1228 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1229 depends on CPU_V7 && SMP 1230 help 1231 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1232 adequately shooting down all use of the old entries. This 1233 option enables the Linux kernel workaround for this erratum 1234 which sends an IPI to the CPUs that are running the same ASID 1235 as the one being invalidated. 1236 1237config ARM_ERRATA_773022 1238 bool "ARM errata: incorrect instructions may be executed from loop buffer" 1239 depends on CPU_V7 1240 help 1241 This option enables the workaround for the 773022 Cortex-A15 1242 (up to r0p4) erratum. In certain rare sequences of code, the 1243 loop buffer may deliver incorrect instructions. This 1244 workaround disables the loop buffer to avoid the erratum. 1245 1246endmenu 1247 1248source "arch/arm/common/Kconfig" 1249 1250menu "Bus support" 1251 1252config ISA 1253 bool 1254 help 1255 Find out whether you have ISA slots on your motherboard. ISA is the 1256 name of a bus system, i.e. the way the CPU talks to the other stuff 1257 inside your box. Other bus systems are PCI, EISA, MicroChannel 1258 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1259 newer boards don't support it. If you have ISA, say Y, otherwise N. 1260 1261# Select ISA DMA controller support 1262config ISA_DMA 1263 bool 1264 select ISA_DMA_API 1265 1266# Select ISA DMA interface 1267config ISA_DMA_API 1268 bool 1269 1270config PCI 1271 bool "PCI support" if MIGHT_HAVE_PCI 1272 help 1273 Find out whether you have a PCI motherboard. PCI is the name of a 1274 bus system, i.e. the way the CPU talks to the other stuff inside 1275 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1276 VESA. If you have PCI, say Y, otherwise N. 1277 1278config PCI_DOMAINS 1279 bool 1280 depends on PCI 1281 1282config PCI_DOMAINS_GENERIC 1283 def_bool PCI_DOMAINS 1284 1285config PCI_NANOENGINE 1286 bool "BSE nanoEngine PCI support" 1287 depends on SA1100_NANOENGINE 1288 help 1289 Enable PCI on the BSE nanoEngine board. 1290 1291config PCI_SYSCALL 1292 def_bool PCI 1293 1294config PCI_HOST_ITE8152 1295 bool 1296 depends on PCI && MACH_ARMCORE 1297 default y 1298 select DMABOUNCE 1299 1300source "drivers/pci/Kconfig" 1301source "drivers/pci/pcie/Kconfig" 1302 1303source "drivers/pcmcia/Kconfig" 1304 1305endmenu 1306 1307menu "Kernel Features" 1308 1309config HAVE_SMP 1310 bool 1311 help 1312 This option should be selected by machines which have an SMP- 1313 capable CPU. 1314 1315 The only effect of this option is to make the SMP-related 1316 options available to the user for configuration. 1317 1318config SMP 1319 bool "Symmetric Multi-Processing" 1320 depends on CPU_V6K || CPU_V7 1321 depends on GENERIC_CLOCKEVENTS 1322 depends on HAVE_SMP 1323 depends on MMU || ARM_MPU 1324 help 1325 This enables support for systems with more than one CPU. If you have 1326 a system with only one CPU, say N. If you have a system with more 1327 than one CPU, say Y. 1328 1329 If you say N here, the kernel will run on uni- and multiprocessor 1330 machines, but will use only one CPU of a multiprocessor machine. If 1331 you say Y here, the kernel will run on many, but not all, 1332 uniprocessor machines. On a uniprocessor machine, the kernel 1333 will run faster if you say N here. 1334 1335 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1336 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1337 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1338 1339 If you don't know what to do here, say N. 1340 1341config SMP_ON_UP 1342 bool "Allow booting SMP kernel on uniprocessor systems" 1343 depends on SMP && !XIP_KERNEL && MMU 1344 default y 1345 help 1346 SMP kernels contain instructions which fail on non-SMP processors. 1347 Enabling this option allows the kernel to modify itself to make 1348 these instructions safe. Disabling it allows about 1K of space 1349 savings. 1350 1351 If you don't know what to do here, say Y. 1352 1353config ARM_CPU_TOPOLOGY 1354 bool "Support cpu topology definition" 1355 depends on SMP && CPU_V7 1356 default y 1357 help 1358 Support ARM cpu topology definition. The MPIDR register defines 1359 affinity between processors which is then used to describe the cpu 1360 topology of an ARM System. 1361 1362config SCHED_MC 1363 bool "Multi-core scheduler support" 1364 depends on ARM_CPU_TOPOLOGY 1365 help 1366 Multi-core scheduler support improves the CPU scheduler's decision 1367 making when dealing with multi-core CPU chips at a cost of slightly 1368 increased overhead in some places. If unsure say N here. 1369 1370config SCHED_SMT 1371 bool "SMT scheduler support" 1372 depends on ARM_CPU_TOPOLOGY 1373 help 1374 Improves the CPU scheduler's decision making when dealing with 1375 MultiThreading at a cost of slightly increased overhead in some 1376 places. If unsure say N here. 1377 1378config HAVE_ARM_SCU 1379 bool 1380 help 1381 This option enables support for the ARM system coherency unit 1382 1383config HAVE_ARM_ARCH_TIMER 1384 bool "Architected timer support" 1385 depends on CPU_V7 1386 select ARM_ARCH_TIMER 1387 select GENERIC_CLOCKEVENTS 1388 help 1389 This option enables support for the ARM architected timer 1390 1391config HAVE_ARM_TWD 1392 bool 1393 depends on SMP 1394 select CLKSRC_OF if OF 1395 help 1396 This options enables support for the ARM timer and watchdog unit 1397 1398config MCPM 1399 bool "Multi-Cluster Power Management" 1400 depends on CPU_V7 && SMP 1401 help 1402 This option provides the common power management infrastructure 1403 for (multi-)cluster based systems, such as big.LITTLE based 1404 systems. 1405 1406config MCPM_QUAD_CLUSTER 1407 bool 1408 depends on MCPM 1409 help 1410 To avoid wasting resources unnecessarily, MCPM only supports up 1411 to 2 clusters by default. 1412 Platforms with 3 or 4 clusters that use MCPM must select this 1413 option to allow the additional clusters to be managed. 1414 1415config BIG_LITTLE 1416 bool "big.LITTLE support (Experimental)" 1417 depends on CPU_V7 && SMP 1418 select MCPM 1419 help 1420 This option enables support selections for the big.LITTLE 1421 system architecture. 1422 1423config BL_SWITCHER 1424 bool "big.LITTLE switcher support" 1425 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU 1426 select ARM_CPU_SUSPEND 1427 select CPU_PM 1428 help 1429 The big.LITTLE "switcher" provides the core functionality to 1430 transparently handle transition between a cluster of A15's 1431 and a cluster of A7's in a big.LITTLE system. 1432 1433config BL_SWITCHER_DUMMY_IF 1434 tristate "Simple big.LITTLE switcher user interface" 1435 depends on BL_SWITCHER && DEBUG_KERNEL 1436 help 1437 This is a simple and dummy char dev interface to control 1438 the big.LITTLE switcher core code. It is meant for 1439 debugging purposes only. 1440 1441choice 1442 prompt "Memory split" 1443 depends on MMU 1444 default VMSPLIT_3G 1445 help 1446 Select the desired split between kernel and user memory. 1447 1448 If you are not absolutely sure what you are doing, leave this 1449 option alone! 1450 1451 config VMSPLIT_3G 1452 bool "3G/1G user/kernel split" 1453 config VMSPLIT_2G 1454 bool "2G/2G user/kernel split" 1455 config VMSPLIT_1G 1456 bool "1G/3G user/kernel split" 1457endchoice 1458 1459config PAGE_OFFSET 1460 hex 1461 default PHYS_OFFSET if !MMU 1462 default 0x40000000 if VMSPLIT_1G 1463 default 0x80000000 if VMSPLIT_2G 1464 default 0xC0000000 1465 1466config NR_CPUS 1467 int "Maximum number of CPUs (2-32)" 1468 range 2 32 1469 depends on SMP 1470 default "4" 1471 1472config HOTPLUG_CPU 1473 bool "Support for hot-pluggable CPUs" 1474 depends on SMP 1475 help 1476 Say Y here to experiment with turning CPUs off and on. CPUs 1477 can be controlled through /sys/devices/system/cpu. 1478 1479config ARM_PSCI 1480 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1481 depends on CPU_V7 1482 help 1483 Say Y here if you want Linux to communicate with system firmware 1484 implementing the PSCI specification for CPU-centric power 1485 management operations described in ARM document number ARM DEN 1486 0022A ("Power State Coordination Interface System Software on 1487 ARM processors"). 1488 1489# The GPIO number here must be sorted by descending number. In case of 1490# a multiplatform kernel, we just want the highest value required by the 1491# selected platforms. 1492config ARCH_NR_GPIO 1493 int 1494 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA || ARCH_ZYNQ 1495 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ 1496 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 1497 default 416 if ARCH_SUNXI 1498 default 392 if ARCH_U8500 1499 default 352 if ARCH_VT8500 1500 default 288 if ARCH_ROCKCHIP 1501 default 264 if MACH_H4700 1502 default 0 1503 help 1504 Maximum number of GPIOs in the system. 1505 1506 If unsure, leave the default value. 1507 1508source kernel/Kconfig.preempt 1509 1510config HZ_FIXED 1511 int 1512 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ 1513 ARCH_S5PV210 || ARCH_EXYNOS4 1514 default AT91_TIMER_HZ if ARCH_AT91 1515 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY 1516 default 0 1517 1518choice 1519 depends on HZ_FIXED = 0 1520 prompt "Timer frequency" 1521 1522config HZ_100 1523 bool "100 Hz" 1524 1525config HZ_200 1526 bool "200 Hz" 1527 1528config HZ_250 1529 bool "250 Hz" 1530 1531config HZ_300 1532 bool "300 Hz" 1533 1534config HZ_500 1535 bool "500 Hz" 1536 1537config HZ_1000 1538 bool "1000 Hz" 1539 1540endchoice 1541 1542config HZ 1543 int 1544 default HZ_FIXED if HZ_FIXED != 0 1545 default 100 if HZ_100 1546 default 200 if HZ_200 1547 default 250 if HZ_250 1548 default 300 if HZ_300 1549 default 500 if HZ_500 1550 default 1000 1551 1552config SCHED_HRTICK 1553 def_bool HIGH_RES_TIMERS 1554 1555config THUMB2_KERNEL 1556 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1557 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1558 default y if CPU_THUMBONLY 1559 select AEABI 1560 select ARM_ASM_UNIFIED 1561 select ARM_UNWIND 1562 help 1563 By enabling this option, the kernel will be compiled in 1564 Thumb-2 mode. A compiler/assembler that understand the unified 1565 ARM-Thumb syntax is needed. 1566 1567 If unsure, say N. 1568 1569config THUMB2_AVOID_R_ARM_THM_JUMP11 1570 bool "Work around buggy Thumb-2 short branch relocations in gas" 1571 depends on THUMB2_KERNEL && MODULES 1572 default y 1573 help 1574 Various binutils versions can resolve Thumb-2 branches to 1575 locally-defined, preemptible global symbols as short-range "b.n" 1576 branch instructions. 1577 1578 This is a problem, because there's no guarantee the final 1579 destination of the symbol, or any candidate locations for a 1580 trampoline, are within range of the branch. For this reason, the 1581 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1582 relocation in modules at all, and it makes little sense to add 1583 support. 1584 1585 The symptom is that the kernel fails with an "unsupported 1586 relocation" error when loading some modules. 1587 1588 Until fixed tools are available, passing 1589 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1590 code which hits this problem, at the cost of a bit of extra runtime 1591 stack usage in some cases. 1592 1593 The problem is described in more detail at: 1594 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1595 1596 Only Thumb-2 kernels are affected. 1597 1598 Unless you are sure your tools don't have this problem, say Y. 1599 1600config ARM_ASM_UNIFIED 1601 bool 1602 1603config AEABI 1604 bool "Use the ARM EABI to compile the kernel" 1605 help 1606 This option allows for the kernel to be compiled using the latest 1607 ARM ABI (aka EABI). This is only useful if you are using a user 1608 space environment that is also compiled with EABI. 1609 1610 Since there are major incompatibilities between the legacy ABI and 1611 EABI, especially with regard to structure member alignment, this 1612 option also changes the kernel syscall calling convention to 1613 disambiguate both ABIs and allow for backward compatibility support 1614 (selected with CONFIG_OABI_COMPAT). 1615 1616 To use this you need GCC version 4.0.0 or later. 1617 1618config OABI_COMPAT 1619 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1620 depends on AEABI && !THUMB2_KERNEL 1621 help 1622 This option preserves the old syscall interface along with the 1623 new (ARM EABI) one. It also provides a compatibility layer to 1624 intercept syscalls that have structure arguments which layout 1625 in memory differs between the legacy ABI and the new ARM EABI 1626 (only for non "thumb" binaries). This option adds a tiny 1627 overhead to all syscalls and produces a slightly larger kernel. 1628 1629 The seccomp filter system will not be available when this is 1630 selected, since there is no way yet to sensibly distinguish 1631 between calling conventions during filtering. 1632 1633 If you know you'll be using only pure EABI user space then you 1634 can say N here. If this option is not selected and you attempt 1635 to execute a legacy ABI binary then the result will be 1636 UNPREDICTABLE (in fact it can be predicted that it won't work 1637 at all). If in doubt say N. 1638 1639config ARCH_HAS_HOLES_MEMORYMODEL 1640 bool 1641 1642config ARCH_SPARSEMEM_ENABLE 1643 bool 1644 1645config ARCH_SPARSEMEM_DEFAULT 1646 def_bool ARCH_SPARSEMEM_ENABLE 1647 1648config ARCH_SELECT_MEMORY_MODEL 1649 def_bool ARCH_SPARSEMEM_ENABLE 1650 1651config HAVE_ARCH_PFN_VALID 1652 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1653 1654config HAVE_GENERIC_RCU_GUP 1655 def_bool y 1656 depends on ARM_LPAE 1657 1658config HIGHMEM 1659 bool "High Memory Support" 1660 depends on MMU 1661 help 1662 The address space of ARM processors is only 4 Gigabytes large 1663 and it has to accommodate user address space, kernel address 1664 space as well as some memory mapped IO. That means that, if you 1665 have a large amount of physical memory and/or IO, not all of the 1666 memory can be "permanently mapped" by the kernel. The physical 1667 memory that is not permanently mapped is called "high memory". 1668 1669 Depending on the selected kernel/user memory split, minimum 1670 vmalloc space and actual amount of RAM, you may not need this 1671 option which should result in a slightly faster kernel. 1672 1673 If unsure, say n. 1674 1675config HIGHPTE 1676 bool "Allocate 2nd-level pagetables from highmem" 1677 depends on HIGHMEM 1678 1679config HW_PERF_EVENTS 1680 bool "Enable hardware performance counter support for perf events" 1681 depends on PERF_EVENTS 1682 default y 1683 help 1684 Enable hardware performance counter support for perf events. If 1685 disabled, perf events will use software events only. 1686 1687config SYS_SUPPORTS_HUGETLBFS 1688 def_bool y 1689 depends on ARM_LPAE 1690 1691config HAVE_ARCH_TRANSPARENT_HUGEPAGE 1692 def_bool y 1693 depends on ARM_LPAE 1694 1695config ARCH_WANT_GENERAL_HUGETLB 1696 def_bool y 1697 1698source "mm/Kconfig" 1699 1700config FORCE_MAX_ZONEORDER 1701 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY 1702 range 11 64 if ARCH_SHMOBILE_LEGACY 1703 default "12" if SOC_AM33XX 1704 default "9" if SA1111 || ARCH_EFM32 1705 default "11" 1706 help 1707 The kernel memory allocator divides physically contiguous memory 1708 blocks into "zones", where each zone is a power of two number of 1709 pages. This option selects the largest power of two that the kernel 1710 keeps in the memory allocator. If you need to allocate very large 1711 blocks of physically contiguous memory, then you may need to 1712 increase this value. 1713 1714 This config option is actually maximum order plus one. For example, 1715 a value of 11 means that the largest free memory block is 2^10 pages. 1716 1717config ALIGNMENT_TRAP 1718 bool 1719 depends on CPU_CP15_MMU 1720 default y if !ARCH_EBSA110 1721 select HAVE_PROC_CPU if PROC_FS 1722 help 1723 ARM processors cannot fetch/store information which is not 1724 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1725 address divisible by 4. On 32-bit ARM processors, these non-aligned 1726 fetch/store instructions will be emulated in software if you say 1727 here, which has a severe performance impact. This is necessary for 1728 correct operation of some network protocols. With an IP-only 1729 configuration it is safe to say N, otherwise say Y. 1730 1731config UACCESS_WITH_MEMCPY 1732 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1733 depends on MMU 1734 default y if CPU_FEROCEON 1735 help 1736 Implement faster copy_to_user and clear_user methods for CPU 1737 cores where a 8-word STM instruction give significantly higher 1738 memory write throughput than a sequence of individual 32bit stores. 1739 1740 A possible side effect is a slight increase in scheduling latency 1741 between threads sharing the same address space if they invoke 1742 such copy operations with large buffers. 1743 1744 However, if the CPU data cache is using a write-allocate mode, 1745 this option is unlikely to provide any performance gain. 1746 1747config SECCOMP 1748 bool 1749 prompt "Enable seccomp to safely compute untrusted bytecode" 1750 ---help--- 1751 This kernel feature is useful for number crunching applications 1752 that may need to compute untrusted bytecode during their 1753 execution. By using pipes or other transports made available to 1754 the process as file descriptors supporting the read/write 1755 syscalls, it's possible to isolate those applications in 1756 their own address space using seccomp. Once seccomp is 1757 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1758 and the task is only allowed to execute a few safe syscalls 1759 defined by each seccomp mode. 1760 1761config SWIOTLB 1762 def_bool y 1763 1764config IOMMU_HELPER 1765 def_bool SWIOTLB 1766 1767config XEN_DOM0 1768 def_bool y 1769 depends on XEN 1770 1771config XEN 1772 bool "Xen guest support on ARM" 1773 depends on ARM && AEABI && OF 1774 depends on CPU_V7 && !CPU_V6 1775 depends on !GENERIC_ATOMIC64 1776 depends on MMU 1777 select ARCH_DMA_ADDR_T_64BIT 1778 select ARM_PSCI 1779 select SWIOTLB_XEN 1780 help 1781 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1782 1783endmenu 1784 1785menu "Boot options" 1786 1787config USE_OF 1788 bool "Flattened Device Tree support" 1789 select IRQ_DOMAIN 1790 select OF 1791 select OF_EARLY_FLATTREE 1792 select OF_RESERVED_MEM 1793 help 1794 Include support for flattened device tree machine descriptions. 1795 1796config ATAGS 1797 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1798 default y 1799 help 1800 This is the traditional way of passing data to the kernel at boot 1801 time. If you are solely relying on the flattened device tree (or 1802 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1803 to remove ATAGS support from your kernel binary. If unsure, 1804 leave this to y. 1805 1806config DEPRECATED_PARAM_STRUCT 1807 bool "Provide old way to pass kernel parameters" 1808 depends on ATAGS 1809 help 1810 This was deprecated in 2001 and announced to live on for 5 years. 1811 Some old boot loaders still use this way. 1812 1813# Compressed boot loader in ROM. Yes, we really want to ask about 1814# TEXT and BSS so we preserve their values in the config files. 1815config ZBOOT_ROM_TEXT 1816 hex "Compressed ROM boot loader base address" 1817 default "0" 1818 help 1819 The physical address at which the ROM-able zImage is to be 1820 placed in the target. Platforms which normally make use of 1821 ROM-able zImage formats normally set this to a suitable 1822 value in their defconfig file. 1823 1824 If ZBOOT_ROM is not enabled, this has no effect. 1825 1826config ZBOOT_ROM_BSS 1827 hex "Compressed ROM boot loader BSS address" 1828 default "0" 1829 help 1830 The base address of an area of read/write memory in the target 1831 for the ROM-able zImage which must be available while the 1832 decompressor is running. It must be large enough to hold the 1833 entire decompressed kernel plus an additional 128 KiB. 1834 Platforms which normally make use of ROM-able zImage formats 1835 normally set this to a suitable value in their defconfig file. 1836 1837 If ZBOOT_ROM is not enabled, this has no effect. 1838 1839config ZBOOT_ROM 1840 bool "Compressed boot loader in ROM/flash" 1841 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1842 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1843 help 1844 Say Y here if you intend to execute your compressed kernel image 1845 (zImage) directly from ROM or flash. If unsure, say N. 1846 1847choice 1848 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)" 1849 depends on ZBOOT_ROM && ARCH_SH7372 1850 default ZBOOT_ROM_NONE 1851 help 1852 Include experimental SD/MMC loading code in the ROM-able zImage. 1853 With this enabled it is possible to write the ROM-able zImage 1854 kernel image to an MMC or SD card and boot the kernel straight 1855 from the reset vector. At reset the processor Mask ROM will load 1856 the first part of the ROM-able zImage which in turn loads the 1857 rest the kernel image to RAM. 1858 1859config ZBOOT_ROM_NONE 1860 bool "No SD/MMC loader in zImage (EXPERIMENTAL)" 1861 help 1862 Do not load image from SD or MMC 1863 1864config ZBOOT_ROM_MMCIF 1865 bool "Include MMCIF loader in zImage (EXPERIMENTAL)" 1866 help 1867 Load image from MMCIF hardware block. 1868 1869config ZBOOT_ROM_SH_MOBILE_SDHI 1870 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)" 1871 help 1872 Load image from SDHI hardware block 1873 1874endchoice 1875 1876config ARM_APPENDED_DTB 1877 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1878 depends on OF 1879 help 1880 With this option, the boot code will look for a device tree binary 1881 (DTB) appended to zImage 1882 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1883 1884 This is meant as a backward compatibility convenience for those 1885 systems with a bootloader that can't be upgraded to accommodate 1886 the documented boot protocol using a device tree. 1887 1888 Beware that there is very little in terms of protection against 1889 this option being confused by leftover garbage in memory that might 1890 look like a DTB header after a reboot if no actual DTB is appended 1891 to zImage. Do not leave this option active in a production kernel 1892 if you don't intend to always append a DTB. Proper passing of the 1893 location into r2 of a bootloader provided DTB is always preferable 1894 to this option. 1895 1896config ARM_ATAG_DTB_COMPAT 1897 bool "Supplement the appended DTB with traditional ATAG information" 1898 depends on ARM_APPENDED_DTB 1899 help 1900 Some old bootloaders can't be updated to a DTB capable one, yet 1901 they provide ATAGs with memory configuration, the ramdisk address, 1902 the kernel cmdline string, etc. Such information is dynamically 1903 provided by the bootloader and can't always be stored in a static 1904 DTB. To allow a device tree enabled kernel to be used with such 1905 bootloaders, this option allows zImage to extract the information 1906 from the ATAG list and store it at run time into the appended DTB. 1907 1908choice 1909 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1910 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1911 1912config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1913 bool "Use bootloader kernel arguments if available" 1914 help 1915 Uses the command-line options passed by the boot loader instead of 1916 the device tree bootargs property. If the boot loader doesn't provide 1917 any, the device tree bootargs property will be used. 1918 1919config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1920 bool "Extend with bootloader kernel arguments" 1921 help 1922 The command-line arguments provided by the boot loader will be 1923 appended to the the device tree bootargs property. 1924 1925endchoice 1926 1927config CMDLINE 1928 string "Default kernel command string" 1929 default "" 1930 help 1931 On some architectures (EBSA110 and CATS), there is currently no way 1932 for the boot loader to pass arguments to the kernel. For these 1933 architectures, you should supply some command-line options at build 1934 time by entering them here. As a minimum, you should specify the 1935 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1936 1937choice 1938 prompt "Kernel command line type" if CMDLINE != "" 1939 default CMDLINE_FROM_BOOTLOADER 1940 depends on ATAGS 1941 1942config CMDLINE_FROM_BOOTLOADER 1943 bool "Use bootloader kernel arguments if available" 1944 help 1945 Uses the command-line options passed by the boot loader. If 1946 the boot loader doesn't provide any, the default kernel command 1947 string provided in CMDLINE will be used. 1948 1949config CMDLINE_EXTEND 1950 bool "Extend bootloader kernel arguments" 1951 help 1952 The command-line arguments provided by the boot loader will be 1953 appended to the default kernel command string. 1954 1955config CMDLINE_FORCE 1956 bool "Always use the default kernel command string" 1957 help 1958 Always use the default kernel command string, even if the boot 1959 loader passes other arguments to the kernel. 1960 This is useful if you cannot or don't want to change the 1961 command-line options your boot loader passes to the kernel. 1962endchoice 1963 1964config XIP_KERNEL 1965 bool "Kernel Execute-In-Place from ROM" 1966 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1967 help 1968 Execute-In-Place allows the kernel to run from non-volatile storage 1969 directly addressable by the CPU, such as NOR flash. This saves RAM 1970 space since the text section of the kernel is not loaded from flash 1971 to RAM. Read-write sections, such as the data section and stack, 1972 are still copied to RAM. The XIP kernel is not compressed since 1973 it has to run directly from flash, so it will take more space to 1974 store it. The flash address used to link the kernel object files, 1975 and for storing it, is configuration dependent. Therefore, if you 1976 say Y here, you must know the proper physical address where to 1977 store the kernel image depending on your own flash memory usage. 1978 1979 Also note that the make target becomes "make xipImage" rather than 1980 "make zImage" or "make Image". The final kernel binary to put in 1981 ROM memory will be arch/arm/boot/xipImage. 1982 1983 If unsure, say N. 1984 1985config XIP_PHYS_ADDR 1986 hex "XIP Kernel Physical Location" 1987 depends on XIP_KERNEL 1988 default "0x00080000" 1989 help 1990 This is the physical address in your flash memory the kernel will 1991 be linked for and stored to. This address is dependent on your 1992 own flash usage. 1993 1994config KEXEC 1995 bool "Kexec system call (EXPERIMENTAL)" 1996 depends on (!SMP || PM_SLEEP_SMP) 1997 help 1998 kexec is a system call that implements the ability to shutdown your 1999 current kernel, and to start another kernel. It is like a reboot 2000 but it is independent of the system firmware. And like a reboot 2001 you can start any kernel with it, not just Linux. 2002 2003 It is an ongoing process to be certain the hardware in a machine 2004 is properly shutdown, so do not be surprised if this code does not 2005 initially work for you. 2006 2007config ATAGS_PROC 2008 bool "Export atags in procfs" 2009 depends on ATAGS && KEXEC 2010 default y 2011 help 2012 Should the atags used to boot the kernel be exported in an "atags" 2013 file in procfs. Useful with kexec. 2014 2015config CRASH_DUMP 2016 bool "Build kdump crash kernel (EXPERIMENTAL)" 2017 help 2018 Generate crash dump after being started by kexec. This should 2019 be normally only set in special crash dump kernels which are 2020 loaded in the main kernel with kexec-tools into a specially 2021 reserved region and then later executed after a crash by 2022 kdump/kexec. The crash dump kernel must be compiled to a 2023 memory address not used by the main kernel 2024 2025 For more details see Documentation/kdump/kdump.txt 2026 2027config AUTO_ZRELADDR 2028 bool "Auto calculation of the decompressed kernel image address" 2029 help 2030 ZRELADDR is the physical address where the decompressed kernel 2031 image will be placed. If AUTO_ZRELADDR is selected, the address 2032 will be determined at run-time by masking the current IP with 2033 0xf8000000. This assumes the zImage being placed in the first 128MB 2034 from start of memory. 2035 2036endmenu 2037 2038menu "CPU Power Management" 2039 2040source "drivers/cpufreq/Kconfig" 2041 2042source "drivers/cpuidle/Kconfig" 2043 2044endmenu 2045 2046menu "Floating point emulation" 2047 2048comment "At least one emulation must be selected" 2049 2050config FPE_NWFPE 2051 bool "NWFPE math emulation" 2052 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2053 ---help--- 2054 Say Y to include the NWFPE floating point emulator in the kernel. 2055 This is necessary to run most binaries. Linux does not currently 2056 support floating point hardware so you need to say Y here even if 2057 your machine has an FPA or floating point co-processor podule. 2058 2059 You may say N here if you are going to load the Acorn FPEmulator 2060 early in the bootup. 2061 2062config FPE_NWFPE_XP 2063 bool "Support extended precision" 2064 depends on FPE_NWFPE 2065 help 2066 Say Y to include 80-bit support in the kernel floating-point 2067 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2068 Note that gcc does not generate 80-bit operations by default, 2069 so in most cases this option only enlarges the size of the 2070 floating point emulator without any good reason. 2071 2072 You almost surely want to say N here. 2073 2074config FPE_FASTFPE 2075 bool "FastFPE math emulation (EXPERIMENTAL)" 2076 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2077 ---help--- 2078 Say Y here to include the FAST floating point emulator in the kernel. 2079 This is an experimental much faster emulator which now also has full 2080 precision for the mantissa. It does not support any exceptions. 2081 It is very simple, and approximately 3-6 times faster than NWFPE. 2082 2083 It should be sufficient for most programs. It may be not suitable 2084 for scientific calculations, but you have to check this for yourself. 2085 If you do not feel you need a faster FP emulation you should better 2086 choose NWFPE. 2087 2088config VFP 2089 bool "VFP-format floating point maths" 2090 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2091 help 2092 Say Y to include VFP support code in the kernel. This is needed 2093 if your hardware includes a VFP unit. 2094 2095 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2096 release notes and additional status information. 2097 2098 Say N if your target does not have VFP hardware. 2099 2100config VFPv3 2101 bool 2102 depends on VFP 2103 default y if CPU_V7 2104 2105config NEON 2106 bool "Advanced SIMD (NEON) Extension support" 2107 depends on VFPv3 && CPU_V7 2108 help 2109 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2110 Extension. 2111 2112config KERNEL_MODE_NEON 2113 bool "Support for NEON in kernel mode" 2114 depends on NEON && AEABI 2115 help 2116 Say Y to include support for NEON in kernel mode. 2117 2118endmenu 2119 2120menu "Userspace binary formats" 2121 2122source "fs/Kconfig.binfmt" 2123 2124endmenu 2125 2126menu "Power management options" 2127 2128source "kernel/power/Kconfig" 2129 2130config ARCH_SUSPEND_POSSIBLE 2131 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 2132 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2133 def_bool y 2134 2135config ARM_CPU_SUSPEND 2136 def_bool PM_SLEEP 2137 2138config ARCH_HIBERNATION_POSSIBLE 2139 bool 2140 depends on MMU 2141 default y if ARCH_SUSPEND_POSSIBLE 2142 2143endmenu 2144 2145source "net/Kconfig" 2146 2147source "drivers/Kconfig" 2148 2149source "fs/Kconfig" 2150 2151source "arch/arm/Kconfig.debug" 2152 2153source "security/Kconfig" 2154 2155source "crypto/Kconfig" 2156if CRYPTO 2157source "arch/arm/crypto/Kconfig" 2158endif 2159 2160source "lib/Kconfig" 2161 2162source "arch/arm/kvm/Kconfig" 2163