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 NEED_MACH_IO_H if PCCARD 371 select PINCTRL 372 select PINCTRL_AT91 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_MSM 636 bool "Qualcomm MSM (non-multiplatform)" 637 select ARCH_REQUIRE_GPIOLIB 638 select COMMON_CLK 639 select GENERIC_CLOCKEVENTS 640 help 641 Support for Qualcomm MSM/QSD based systems. This runs on the 642 apps processor of the MSM/QSD and depends on a shared memory 643 interface to the modem processor which runs the baseband 644 stack and controls some vital subsystems 645 (clock and power control, etc). 646 647config ARCH_SHMOBILE_LEGACY 648 bool "Renesas ARM SoCs (non-multiplatform)" 649 select ARCH_SHMOBILE 650 select ARM_PATCH_PHYS_VIRT if MMU 651 select CLKDEV_LOOKUP 652 select CPU_V7 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 SH_CLK_CPG 664 select SPARSE_IRQ 665 help 666 Support for Renesas ARM SoC platforms using a non-multiplatform 667 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car 668 and RZ families. 669 670config ARCH_RPC 671 bool "RiscPC" 672 select ARCH_ACORN 673 select ARCH_MAY_HAVE_PC_FDC 674 select ARCH_SPARSEMEM_ENABLE 675 select ARCH_USES_GETTIMEOFFSET 676 select CPU_SA110 677 select FIQ 678 select HAVE_IDE 679 select HAVE_PATA_PLATFORM 680 select ISA_DMA_API 681 select NEED_MACH_IO_H 682 select NEED_MACH_MEMORY_H 683 select NO_IOPORT_MAP 684 select VIRT_TO_BUS 685 help 686 On the Acorn Risc-PC, Linux can support the internal IDE disk and 687 CD-ROM interface, serial and parallel port, and the floppy drive. 688 689config ARCH_SA1100 690 bool "SA1100-based" 691 select ARCH_MTD_XIP 692 select ARCH_REQUIRE_GPIOLIB 693 select ARCH_SPARSEMEM_ENABLE 694 select CLKDEV_LOOKUP 695 select CLKSRC_MMIO 696 select CPU_FREQ 697 select CPU_SA1100 698 select GENERIC_CLOCKEVENTS 699 select HAVE_IDE 700 select IRQ_DOMAIN 701 select ISA 702 select MULTI_IRQ_HANDLER 703 select NEED_MACH_MEMORY_H 704 select SPARSE_IRQ 705 help 706 Support for StrongARM 11x0 based boards. 707 708config ARCH_S3C24XX 709 bool "Samsung S3C24XX SoCs" 710 select ARCH_REQUIRE_GPIOLIB 711 select ATAGS 712 select CLKDEV_LOOKUP 713 select CLKSRC_SAMSUNG_PWM 714 select GENERIC_CLOCKEVENTS 715 select GPIO_SAMSUNG 716 select HAVE_S3C2410_I2C if I2C 717 select HAVE_S3C2410_WATCHDOG if WATCHDOG 718 select HAVE_S3C_RTC if RTC_CLASS 719 select MULTI_IRQ_HANDLER 720 select NEED_MACH_IO_H 721 select SAMSUNG_ATAGS 722 help 723 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 724 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 725 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 726 Samsung SMDK2410 development board (and derivatives). 727 728config ARCH_S3C64XX 729 bool "Samsung S3C64XX" 730 select ARCH_REQUIRE_GPIOLIB 731 select ARM_AMBA 732 select ARM_VIC 733 select ATAGS 734 select CLKDEV_LOOKUP 735 select CLKSRC_SAMSUNG_PWM 736 select COMMON_CLK_SAMSUNG 737 select CPU_V6K 738 select GENERIC_CLOCKEVENTS 739 select GPIO_SAMSUNG 740 select HAVE_S3C2410_I2C if I2C 741 select HAVE_S3C2410_WATCHDOG if WATCHDOG 742 select HAVE_TCM 743 select NO_IOPORT_MAP 744 select PLAT_SAMSUNG 745 select PM_GENERIC_DOMAINS if PM 746 select S3C_DEV_NAND 747 select S3C_GPIO_TRACK 748 select SAMSUNG_ATAGS 749 select SAMSUNG_WAKEMASK 750 select SAMSUNG_WDT_RESET 751 help 752 Samsung S3C64XX series based systems 753 754config ARCH_DAVINCI 755 bool "TI DaVinci" 756 select ARCH_HAS_HOLES_MEMORYMODEL 757 select ARCH_REQUIRE_GPIOLIB 758 select CLKDEV_LOOKUP 759 select GENERIC_ALLOCATOR 760 select GENERIC_CLOCKEVENTS 761 select GENERIC_IRQ_CHIP 762 select HAVE_IDE 763 select TI_PRIV_EDMA 764 select USE_OF 765 select ZONE_DMA 766 help 767 Support for TI's DaVinci platform. 768 769config ARCH_OMAP1 770 bool "TI OMAP1" 771 depends on MMU 772 select ARCH_HAS_HOLES_MEMORYMODEL 773 select ARCH_OMAP 774 select ARCH_REQUIRE_GPIOLIB 775 select CLKDEV_LOOKUP 776 select CLKSRC_MMIO 777 select GENERIC_CLOCKEVENTS 778 select GENERIC_IRQ_CHIP 779 select HAVE_IDE 780 select IRQ_DOMAIN 781 select NEED_MACH_IO_H if PCCARD 782 select NEED_MACH_MEMORY_H 783 help 784 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 785 786endchoice 787 788menu "Multiple platform selection" 789 depends on ARCH_MULTIPLATFORM 790 791comment "CPU Core family selection" 792 793config ARCH_MULTI_V4 794 bool "ARMv4 based platforms (FA526)" 795 depends on !ARCH_MULTI_V6_V7 796 select ARCH_MULTI_V4_V5 797 select CPU_FA526 798 799config ARCH_MULTI_V4T 800 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 801 depends on !ARCH_MULTI_V6_V7 802 select ARCH_MULTI_V4_V5 803 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 804 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 805 CPU_ARM925T || CPU_ARM940T) 806 807config ARCH_MULTI_V5 808 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 809 depends on !ARCH_MULTI_V6_V7 810 select ARCH_MULTI_V4_V5 811 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 812 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 813 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 814 815config ARCH_MULTI_V4_V5 816 bool 817 818config ARCH_MULTI_V6 819 bool "ARMv6 based platforms (ARM11)" 820 select ARCH_MULTI_V6_V7 821 select CPU_V6K 822 823config ARCH_MULTI_V7 824 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 825 default y 826 select ARCH_MULTI_V6_V7 827 select CPU_V7 828 select HAVE_SMP 829 830config ARCH_MULTI_V6_V7 831 bool 832 select MIGHT_HAVE_CACHE_L2X0 833 834config ARCH_MULTI_CPU_AUTO 835 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 836 select ARCH_MULTI_V5 837 838endmenu 839 840config ARCH_VIRT 841 bool "Dummy Virtual Machine" if ARCH_MULTI_V7 842 select ARM_AMBA 843 select ARM_GIC 844 select ARM_PSCI 845 select HAVE_ARM_ARCH_TIMER 846 847# 848# This is sorted alphabetically by mach-* pathname. However, plat-* 849# Kconfigs may be included either alphabetically (according to the 850# plat- suffix) or along side the corresponding mach-* source. 851# 852source "arch/arm/mach-mvebu/Kconfig" 853 854source "arch/arm/mach-asm9260/Kconfig" 855 856source "arch/arm/mach-at91/Kconfig" 857 858source "arch/arm/mach-axxia/Kconfig" 859 860source "arch/arm/mach-bcm/Kconfig" 861 862source "arch/arm/mach-berlin/Kconfig" 863 864source "arch/arm/mach-clps711x/Kconfig" 865 866source "arch/arm/mach-cns3xxx/Kconfig" 867 868source "arch/arm/mach-davinci/Kconfig" 869 870source "arch/arm/mach-digicolor/Kconfig" 871 872source "arch/arm/mach-dove/Kconfig" 873 874source "arch/arm/mach-ep93xx/Kconfig" 875 876source "arch/arm/mach-footbridge/Kconfig" 877 878source "arch/arm/mach-gemini/Kconfig" 879 880source "arch/arm/mach-highbank/Kconfig" 881 882source "arch/arm/mach-hisi/Kconfig" 883 884source "arch/arm/mach-integrator/Kconfig" 885 886source "arch/arm/mach-iop32x/Kconfig" 887 888source "arch/arm/mach-iop33x/Kconfig" 889 890source "arch/arm/mach-iop13xx/Kconfig" 891 892source "arch/arm/mach-ixp4xx/Kconfig" 893 894source "arch/arm/mach-keystone/Kconfig" 895 896source "arch/arm/mach-ks8695/Kconfig" 897 898source "arch/arm/mach-meson/Kconfig" 899 900source "arch/arm/mach-msm/Kconfig" 901 902source "arch/arm/mach-moxart/Kconfig" 903 904source "arch/arm/mach-mv78xx0/Kconfig" 905 906source "arch/arm/mach-imx/Kconfig" 907 908source "arch/arm/mach-mediatek/Kconfig" 909 910source "arch/arm/mach-mxs/Kconfig" 911 912source "arch/arm/mach-netx/Kconfig" 913 914source "arch/arm/mach-nomadik/Kconfig" 915 916source "arch/arm/mach-nspire/Kconfig" 917 918source "arch/arm/plat-omap/Kconfig" 919 920source "arch/arm/mach-omap1/Kconfig" 921 922source "arch/arm/mach-omap2/Kconfig" 923 924source "arch/arm/mach-orion5x/Kconfig" 925 926source "arch/arm/mach-picoxcell/Kconfig" 927 928source "arch/arm/mach-pxa/Kconfig" 929source "arch/arm/plat-pxa/Kconfig" 930 931source "arch/arm/mach-mmp/Kconfig" 932 933source "arch/arm/mach-qcom/Kconfig" 934 935source "arch/arm/mach-realview/Kconfig" 936 937source "arch/arm/mach-rockchip/Kconfig" 938 939source "arch/arm/mach-sa1100/Kconfig" 940 941source "arch/arm/mach-socfpga/Kconfig" 942 943source "arch/arm/mach-spear/Kconfig" 944 945source "arch/arm/mach-sti/Kconfig" 946 947source "arch/arm/mach-s3c24xx/Kconfig" 948 949source "arch/arm/mach-s3c64xx/Kconfig" 950 951source "arch/arm/mach-s5pv210/Kconfig" 952 953source "arch/arm/mach-exynos/Kconfig" 954source "arch/arm/plat-samsung/Kconfig" 955 956source "arch/arm/mach-shmobile/Kconfig" 957 958source "arch/arm/mach-sunxi/Kconfig" 959 960source "arch/arm/mach-prima2/Kconfig" 961 962source "arch/arm/mach-tegra/Kconfig" 963 964source "arch/arm/mach-u300/Kconfig" 965 966source "arch/arm/mach-ux500/Kconfig" 967 968source "arch/arm/mach-versatile/Kconfig" 969 970source "arch/arm/mach-vexpress/Kconfig" 971source "arch/arm/plat-versatile/Kconfig" 972 973source "arch/arm/mach-vt8500/Kconfig" 974 975source "arch/arm/mach-w90x900/Kconfig" 976 977source "arch/arm/mach-zynq/Kconfig" 978 979# Definitions to make life easier 980config ARCH_ACORN 981 bool 982 983config PLAT_IOP 984 bool 985 select GENERIC_CLOCKEVENTS 986 987config PLAT_ORION 988 bool 989 select CLKSRC_MMIO 990 select COMMON_CLK 991 select GENERIC_IRQ_CHIP 992 select IRQ_DOMAIN 993 994config PLAT_ORION_LEGACY 995 bool 996 select PLAT_ORION 997 998config PLAT_PXA 999 bool 1000 1001config PLAT_VERSATILE 1002 bool 1003 1004config ARM_TIMER_SP804 1005 bool 1006 select CLKSRC_MMIO 1007 select CLKSRC_OF if OF 1008 1009source "arch/arm/firmware/Kconfig" 1010 1011source arch/arm/mm/Kconfig 1012 1013config IWMMXT 1014 bool "Enable iWMMXt support" 1015 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 1016 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 1017 help 1018 Enable support for iWMMXt context switching at run time if 1019 running on a CPU that supports it. 1020 1021config MULTI_IRQ_HANDLER 1022 bool 1023 help 1024 Allow each machine to specify it's own IRQ handler at run time. 1025 1026if !MMU 1027source "arch/arm/Kconfig-nommu" 1028endif 1029 1030config PJ4B_ERRATA_4742 1031 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1032 depends on CPU_PJ4B && MACH_ARMADA_370 1033 default y 1034 help 1035 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1036 Event (WFE) IDLE states, a specific timing sensitivity exists between 1037 the retiring WFI/WFE instructions and the newly issued subsequent 1038 instructions. This sensitivity can result in a CPU hang scenario. 1039 Workaround: 1040 The software must insert either a Data Synchronization Barrier (DSB) 1041 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1042 instruction 1043 1044config ARM_ERRATA_326103 1045 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1046 depends on CPU_V6 1047 help 1048 Executing a SWP instruction to read-only memory does not set bit 11 1049 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1050 treat the access as a read, preventing a COW from occurring and 1051 causing the faulting task to livelock. 1052 1053config ARM_ERRATA_411920 1054 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1055 depends on CPU_V6 || CPU_V6K 1056 help 1057 Invalidation of the Instruction Cache operation can 1058 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1059 It does not affect the MPCore. This option enables the ARM Ltd. 1060 recommended workaround. 1061 1062config ARM_ERRATA_430973 1063 bool "ARM errata: Stale prediction on replaced interworking branch" 1064 depends on CPU_V7 1065 help 1066 This option enables the workaround for the 430973 Cortex-A8 1067 r1p* erratum. If a code sequence containing an ARM/Thumb 1068 interworking branch is replaced with another code sequence at the 1069 same virtual address, whether due to self-modifying code or virtual 1070 to physical address re-mapping, Cortex-A8 does not recover from the 1071 stale interworking branch prediction. This results in Cortex-A8 1072 executing the new code sequence in the incorrect ARM or Thumb state. 1073 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1074 and also flushes the branch target cache at every context switch. 1075 Note that setting specific bits in the ACTLR register may not be 1076 available in non-secure mode. 1077 1078config ARM_ERRATA_458693 1079 bool "ARM errata: Processor deadlock when a false hazard is created" 1080 depends on CPU_V7 1081 depends on !ARCH_MULTIPLATFORM 1082 help 1083 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1084 erratum. For very specific sequences of memory operations, it is 1085 possible for a hazard condition intended for a cache line to instead 1086 be incorrectly associated with a different cache line. This false 1087 hazard might then cause a processor deadlock. The workaround enables 1088 the L1 caching of the NEON accesses and disables the PLD instruction 1089 in the ACTLR register. Note that setting specific bits in the ACTLR 1090 register may not be available in non-secure mode. 1091 1092config ARM_ERRATA_460075 1093 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1094 depends on CPU_V7 1095 depends on !ARCH_MULTIPLATFORM 1096 help 1097 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1098 erratum. Any asynchronous access to the L2 cache may encounter a 1099 situation in which recent store transactions to the L2 cache are lost 1100 and overwritten with stale memory contents from external memory. The 1101 workaround disables the write-allocate mode for the L2 cache via the 1102 ACTLR register. Note that setting specific bits in the ACTLR register 1103 may not be available in non-secure mode. 1104 1105config ARM_ERRATA_742230 1106 bool "ARM errata: DMB operation may be faulty" 1107 depends on CPU_V7 && SMP 1108 depends on !ARCH_MULTIPLATFORM 1109 help 1110 This option enables the workaround for the 742230 Cortex-A9 1111 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1112 between two write operations may not ensure the correct visibility 1113 ordering of the two writes. This workaround sets a specific bit in 1114 the diagnostic register of the Cortex-A9 which causes the DMB 1115 instruction to behave as a DSB, ensuring the correct behaviour of 1116 the two writes. 1117 1118config ARM_ERRATA_742231 1119 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1120 depends on CPU_V7 && SMP 1121 depends on !ARCH_MULTIPLATFORM 1122 help 1123 This option enables the workaround for the 742231 Cortex-A9 1124 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1125 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1126 accessing some data located in the same cache line, may get corrupted 1127 data due to bad handling of the address hazard when the line gets 1128 replaced from one of the CPUs at the same time as another CPU is 1129 accessing it. This workaround sets specific bits in the diagnostic 1130 register of the Cortex-A9 which reduces the linefill issuing 1131 capabilities of the processor. 1132 1133config ARM_ERRATA_643719 1134 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1135 depends on CPU_V7 && SMP 1136 default y 1137 help 1138 This option enables the workaround for the 643719 Cortex-A9 (prior to 1139 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1140 register returns zero when it should return one. The workaround 1141 corrects this value, ensuring cache maintenance operations which use 1142 it behave as intended and avoiding data corruption. 1143 1144config ARM_ERRATA_720789 1145 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1146 depends on CPU_V7 1147 help 1148 This option enables the workaround for the 720789 Cortex-A9 (prior to 1149 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1150 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1151 As a consequence of this erratum, some TLB entries which should be 1152 invalidated are not, resulting in an incoherency in the system page 1153 tables. The workaround changes the TLB flushing routines to invalidate 1154 entries regardless of the ASID. 1155 1156config ARM_ERRATA_743622 1157 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1158 depends on CPU_V7 1159 depends on !ARCH_MULTIPLATFORM 1160 help 1161 This option enables the workaround for the 743622 Cortex-A9 1162 (r2p*) erratum. Under very rare conditions, a faulty 1163 optimisation in the Cortex-A9 Store Buffer may lead to data 1164 corruption. This workaround sets a specific bit in the diagnostic 1165 register of the Cortex-A9 which disables the Store Buffer 1166 optimisation, preventing the defect from occurring. This has no 1167 visible impact on the overall performance or power consumption of the 1168 processor. 1169 1170config ARM_ERRATA_751472 1171 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1172 depends on CPU_V7 1173 depends on !ARCH_MULTIPLATFORM 1174 help 1175 This option enables the workaround for the 751472 Cortex-A9 (prior 1176 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1177 completion of a following broadcasted operation if the second 1178 operation is received by a CPU before the ICIALLUIS has completed, 1179 potentially leading to corrupted entries in the cache or TLB. 1180 1181config ARM_ERRATA_754322 1182 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1183 depends on CPU_V7 1184 help 1185 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1186 r3p*) erratum. A speculative memory access may cause a page table walk 1187 which starts prior to an ASID switch but completes afterwards. This 1188 can populate the micro-TLB with a stale entry which may be hit with 1189 the new ASID. This workaround places two dsb instructions in the mm 1190 switching code so that no page table walks can cross the ASID switch. 1191 1192config ARM_ERRATA_754327 1193 bool "ARM errata: no automatic Store Buffer drain" 1194 depends on CPU_V7 && SMP 1195 help 1196 This option enables the workaround for the 754327 Cortex-A9 (prior to 1197 r2p0) erratum. The Store Buffer does not have any automatic draining 1198 mechanism and therefore a livelock may occur if an external agent 1199 continuously polls a memory location waiting to observe an update. 1200 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1201 written polling loops from denying visibility of updates to memory. 1202 1203config ARM_ERRATA_364296 1204 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1205 depends on CPU_V6 1206 help 1207 This options enables the workaround for the 364296 ARM1136 1208 r0p2 erratum (possible cache data corruption with 1209 hit-under-miss enabled). It sets the undocumented bit 31 in 1210 the auxiliary control register and the FI bit in the control 1211 register, thus disabling hit-under-miss without putting the 1212 processor into full low interrupt latency mode. ARM11MPCore 1213 is not affected. 1214 1215config ARM_ERRATA_764369 1216 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1217 depends on CPU_V7 && SMP 1218 help 1219 This option enables the workaround for erratum 764369 1220 affecting Cortex-A9 MPCore with two or more processors (all 1221 current revisions). Under certain timing circumstances, a data 1222 cache line maintenance operation by MVA targeting an Inner 1223 Shareable memory region may fail to proceed up to either the 1224 Point of Coherency or to the Point of Unification of the 1225 system. This workaround adds a DSB instruction before the 1226 relevant cache maintenance functions and sets a specific bit 1227 in the diagnostic control register of the SCU. 1228 1229config ARM_ERRATA_775420 1230 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1231 depends on CPU_V7 1232 help 1233 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1234 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1235 operation aborts with MMU exception, it might cause the processor 1236 to deadlock. This workaround puts DSB before executing ISB if 1237 an abort may occur on cache maintenance. 1238 1239config ARM_ERRATA_798181 1240 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1241 depends on CPU_V7 && SMP 1242 help 1243 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1244 adequately shooting down all use of the old entries. This 1245 option enables the Linux kernel workaround for this erratum 1246 which sends an IPI to the CPUs that are running the same ASID 1247 as the one being invalidated. 1248 1249config ARM_ERRATA_773022 1250 bool "ARM errata: incorrect instructions may be executed from loop buffer" 1251 depends on CPU_V7 1252 help 1253 This option enables the workaround for the 773022 Cortex-A15 1254 (up to r0p4) erratum. In certain rare sequences of code, the 1255 loop buffer may deliver incorrect instructions. This 1256 workaround disables the loop buffer to avoid the erratum. 1257 1258endmenu 1259 1260source "arch/arm/common/Kconfig" 1261 1262menu "Bus support" 1263 1264config ISA 1265 bool 1266 help 1267 Find out whether you have ISA slots on your motherboard. ISA is the 1268 name of a bus system, i.e. the way the CPU talks to the other stuff 1269 inside your box. Other bus systems are PCI, EISA, MicroChannel 1270 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1271 newer boards don't support it. If you have ISA, say Y, otherwise N. 1272 1273# Select ISA DMA controller support 1274config ISA_DMA 1275 bool 1276 select ISA_DMA_API 1277 1278# Select ISA DMA interface 1279config ISA_DMA_API 1280 bool 1281 1282config PCI 1283 bool "PCI support" if MIGHT_HAVE_PCI 1284 help 1285 Find out whether you have a PCI motherboard. PCI is the name of a 1286 bus system, i.e. the way the CPU talks to the other stuff inside 1287 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1288 VESA. If you have PCI, say Y, otherwise N. 1289 1290config PCI_DOMAINS 1291 bool 1292 depends on PCI 1293 1294config PCI_DOMAINS_GENERIC 1295 def_bool PCI_DOMAINS 1296 1297config PCI_NANOENGINE 1298 bool "BSE nanoEngine PCI support" 1299 depends on SA1100_NANOENGINE 1300 help 1301 Enable PCI on the BSE nanoEngine board. 1302 1303config PCI_SYSCALL 1304 def_bool PCI 1305 1306config PCI_HOST_ITE8152 1307 bool 1308 depends on PCI && MACH_ARMCORE 1309 default y 1310 select DMABOUNCE 1311 1312source "drivers/pci/Kconfig" 1313source "drivers/pci/pcie/Kconfig" 1314 1315source "drivers/pcmcia/Kconfig" 1316 1317endmenu 1318 1319menu "Kernel Features" 1320 1321config HAVE_SMP 1322 bool 1323 help 1324 This option should be selected by machines which have an SMP- 1325 capable CPU. 1326 1327 The only effect of this option is to make the SMP-related 1328 options available to the user for configuration. 1329 1330config SMP 1331 bool "Symmetric Multi-Processing" 1332 depends on CPU_V6K || CPU_V7 1333 depends on GENERIC_CLOCKEVENTS 1334 depends on HAVE_SMP 1335 depends on MMU || ARM_MPU 1336 help 1337 This enables support for systems with more than one CPU. If you have 1338 a system with only one CPU, say N. If you have a system with more 1339 than one CPU, say Y. 1340 1341 If you say N here, the kernel will run on uni- and multiprocessor 1342 machines, but will use only one CPU of a multiprocessor machine. If 1343 you say Y here, the kernel will run on many, but not all, 1344 uniprocessor machines. On a uniprocessor machine, the kernel 1345 will run faster if you say N here. 1346 1347 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1348 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1349 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1350 1351 If you don't know what to do here, say N. 1352 1353config SMP_ON_UP 1354 bool "Allow booting SMP kernel on uniprocessor systems" 1355 depends on SMP && !XIP_KERNEL && MMU 1356 default y 1357 help 1358 SMP kernels contain instructions which fail on non-SMP processors. 1359 Enabling this option allows the kernel to modify itself to make 1360 these instructions safe. Disabling it allows about 1K of space 1361 savings. 1362 1363 If you don't know what to do here, say Y. 1364 1365config ARM_CPU_TOPOLOGY 1366 bool "Support cpu topology definition" 1367 depends on SMP && CPU_V7 1368 default y 1369 help 1370 Support ARM cpu topology definition. The MPIDR register defines 1371 affinity between processors which is then used to describe the cpu 1372 topology of an ARM System. 1373 1374config SCHED_MC 1375 bool "Multi-core scheduler support" 1376 depends on ARM_CPU_TOPOLOGY 1377 help 1378 Multi-core scheduler support improves the CPU scheduler's decision 1379 making when dealing with multi-core CPU chips at a cost of slightly 1380 increased overhead in some places. If unsure say N here. 1381 1382config SCHED_SMT 1383 bool "SMT scheduler support" 1384 depends on ARM_CPU_TOPOLOGY 1385 help 1386 Improves the CPU scheduler's decision making when dealing with 1387 MultiThreading at a cost of slightly increased overhead in some 1388 places. If unsure say N here. 1389 1390config HAVE_ARM_SCU 1391 bool 1392 help 1393 This option enables support for the ARM system coherency unit 1394 1395config HAVE_ARM_ARCH_TIMER 1396 bool "Architected timer support" 1397 depends on CPU_V7 1398 select ARM_ARCH_TIMER 1399 select GENERIC_CLOCKEVENTS 1400 help 1401 This option enables support for the ARM architected timer 1402 1403config HAVE_ARM_TWD 1404 bool 1405 depends on SMP 1406 select CLKSRC_OF if OF 1407 help 1408 This options enables support for the ARM timer and watchdog unit 1409 1410config MCPM 1411 bool "Multi-Cluster Power Management" 1412 depends on CPU_V7 && SMP 1413 help 1414 This option provides the common power management infrastructure 1415 for (multi-)cluster based systems, such as big.LITTLE based 1416 systems. 1417 1418config MCPM_QUAD_CLUSTER 1419 bool 1420 depends on MCPM 1421 help 1422 To avoid wasting resources unnecessarily, MCPM only supports up 1423 to 2 clusters by default. 1424 Platforms with 3 or 4 clusters that use MCPM must select this 1425 option to allow the additional clusters to be managed. 1426 1427config BIG_LITTLE 1428 bool "big.LITTLE support (Experimental)" 1429 depends on CPU_V7 && SMP 1430 select MCPM 1431 help 1432 This option enables support selections for the big.LITTLE 1433 system architecture. 1434 1435config BL_SWITCHER 1436 bool "big.LITTLE switcher support" 1437 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU 1438 select ARM_CPU_SUSPEND 1439 select CPU_PM 1440 help 1441 The big.LITTLE "switcher" provides the core functionality to 1442 transparently handle transition between a cluster of A15's 1443 and a cluster of A7's in a big.LITTLE system. 1444 1445config BL_SWITCHER_DUMMY_IF 1446 tristate "Simple big.LITTLE switcher user interface" 1447 depends on BL_SWITCHER && DEBUG_KERNEL 1448 help 1449 This is a simple and dummy char dev interface to control 1450 the big.LITTLE switcher core code. It is meant for 1451 debugging purposes only. 1452 1453choice 1454 prompt "Memory split" 1455 depends on MMU 1456 default VMSPLIT_3G 1457 help 1458 Select the desired split between kernel and user memory. 1459 1460 If you are not absolutely sure what you are doing, leave this 1461 option alone! 1462 1463 config VMSPLIT_3G 1464 bool "3G/1G user/kernel split" 1465 config VMSPLIT_2G 1466 bool "2G/2G user/kernel split" 1467 config VMSPLIT_1G 1468 bool "1G/3G user/kernel split" 1469endchoice 1470 1471config PAGE_OFFSET 1472 hex 1473 default PHYS_OFFSET if !MMU 1474 default 0x40000000 if VMSPLIT_1G 1475 default 0x80000000 if VMSPLIT_2G 1476 default 0xC0000000 1477 1478config NR_CPUS 1479 int "Maximum number of CPUs (2-32)" 1480 range 2 32 1481 depends on SMP 1482 default "4" 1483 1484config HOTPLUG_CPU 1485 bool "Support for hot-pluggable CPUs" 1486 depends on SMP 1487 help 1488 Say Y here to experiment with turning CPUs off and on. CPUs 1489 can be controlled through /sys/devices/system/cpu. 1490 1491config ARM_PSCI 1492 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1493 depends on CPU_V7 1494 help 1495 Say Y here if you want Linux to communicate with system firmware 1496 implementing the PSCI specification for CPU-centric power 1497 management operations described in ARM document number ARM DEN 1498 0022A ("Power State Coordination Interface System Software on 1499 ARM processors"). 1500 1501# The GPIO number here must be sorted by descending number. In case of 1502# a multiplatform kernel, we just want the highest value required by the 1503# selected platforms. 1504config ARCH_NR_GPIO 1505 int 1506 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA || ARCH_ZYNQ 1507 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ 1508 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 1509 default 416 if ARCH_SUNXI 1510 default 392 if ARCH_U8500 1511 default 352 if ARCH_VT8500 1512 default 288 if ARCH_ROCKCHIP 1513 default 264 if MACH_H4700 1514 default 0 1515 help 1516 Maximum number of GPIOs in the system. 1517 1518 If unsure, leave the default value. 1519 1520source kernel/Kconfig.preempt 1521 1522config HZ_FIXED 1523 int 1524 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ 1525 ARCH_S5PV210 || ARCH_EXYNOS4 1526 default AT91_TIMER_HZ if ARCH_AT91 1527 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY 1528 default 0 1529 1530choice 1531 depends on HZ_FIXED = 0 1532 prompt "Timer frequency" 1533 1534config HZ_100 1535 bool "100 Hz" 1536 1537config HZ_200 1538 bool "200 Hz" 1539 1540config HZ_250 1541 bool "250 Hz" 1542 1543config HZ_300 1544 bool "300 Hz" 1545 1546config HZ_500 1547 bool "500 Hz" 1548 1549config HZ_1000 1550 bool "1000 Hz" 1551 1552endchoice 1553 1554config HZ 1555 int 1556 default HZ_FIXED if HZ_FIXED != 0 1557 default 100 if HZ_100 1558 default 200 if HZ_200 1559 default 250 if HZ_250 1560 default 300 if HZ_300 1561 default 500 if HZ_500 1562 default 1000 1563 1564config SCHED_HRTICK 1565 def_bool HIGH_RES_TIMERS 1566 1567config THUMB2_KERNEL 1568 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1569 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1570 default y if CPU_THUMBONLY 1571 select AEABI 1572 select ARM_ASM_UNIFIED 1573 select ARM_UNWIND 1574 help 1575 By enabling this option, the kernel will be compiled in 1576 Thumb-2 mode. A compiler/assembler that understand the unified 1577 ARM-Thumb syntax is needed. 1578 1579 If unsure, say N. 1580 1581config THUMB2_AVOID_R_ARM_THM_JUMP11 1582 bool "Work around buggy Thumb-2 short branch relocations in gas" 1583 depends on THUMB2_KERNEL && MODULES 1584 default y 1585 help 1586 Various binutils versions can resolve Thumb-2 branches to 1587 locally-defined, preemptible global symbols as short-range "b.n" 1588 branch instructions. 1589 1590 This is a problem, because there's no guarantee the final 1591 destination of the symbol, or any candidate locations for a 1592 trampoline, are within range of the branch. For this reason, the 1593 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1594 relocation in modules at all, and it makes little sense to add 1595 support. 1596 1597 The symptom is that the kernel fails with an "unsupported 1598 relocation" error when loading some modules. 1599 1600 Until fixed tools are available, passing 1601 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1602 code which hits this problem, at the cost of a bit of extra runtime 1603 stack usage in some cases. 1604 1605 The problem is described in more detail at: 1606 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1607 1608 Only Thumb-2 kernels are affected. 1609 1610 Unless you are sure your tools don't have this problem, say Y. 1611 1612config ARM_ASM_UNIFIED 1613 bool 1614 1615config AEABI 1616 bool "Use the ARM EABI to compile the kernel" 1617 help 1618 This option allows for the kernel to be compiled using the latest 1619 ARM ABI (aka EABI). This is only useful if you are using a user 1620 space environment that is also compiled with EABI. 1621 1622 Since there are major incompatibilities between the legacy ABI and 1623 EABI, especially with regard to structure member alignment, this 1624 option also changes the kernel syscall calling convention to 1625 disambiguate both ABIs and allow for backward compatibility support 1626 (selected with CONFIG_OABI_COMPAT). 1627 1628 To use this you need GCC version 4.0.0 or later. 1629 1630config OABI_COMPAT 1631 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1632 depends on AEABI && !THUMB2_KERNEL 1633 help 1634 This option preserves the old syscall interface along with the 1635 new (ARM EABI) one. It also provides a compatibility layer to 1636 intercept syscalls that have structure arguments which layout 1637 in memory differs between the legacy ABI and the new ARM EABI 1638 (only for non "thumb" binaries). This option adds a tiny 1639 overhead to all syscalls and produces a slightly larger kernel. 1640 1641 The seccomp filter system will not be available when this is 1642 selected, since there is no way yet to sensibly distinguish 1643 between calling conventions during filtering. 1644 1645 If you know you'll be using only pure EABI user space then you 1646 can say N here. If this option is not selected and you attempt 1647 to execute a legacy ABI binary then the result will be 1648 UNPREDICTABLE (in fact it can be predicted that it won't work 1649 at all). If in doubt say N. 1650 1651config ARCH_HAS_HOLES_MEMORYMODEL 1652 bool 1653 1654config ARCH_SPARSEMEM_ENABLE 1655 bool 1656 1657config ARCH_SPARSEMEM_DEFAULT 1658 def_bool ARCH_SPARSEMEM_ENABLE 1659 1660config ARCH_SELECT_MEMORY_MODEL 1661 def_bool ARCH_SPARSEMEM_ENABLE 1662 1663config HAVE_ARCH_PFN_VALID 1664 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1665 1666config HAVE_GENERIC_RCU_GUP 1667 def_bool y 1668 depends on ARM_LPAE 1669 1670config HIGHMEM 1671 bool "High Memory Support" 1672 depends on MMU 1673 help 1674 The address space of ARM processors is only 4 Gigabytes large 1675 and it has to accommodate user address space, kernel address 1676 space as well as some memory mapped IO. That means that, if you 1677 have a large amount of physical memory and/or IO, not all of the 1678 memory can be "permanently mapped" by the kernel. The physical 1679 memory that is not permanently mapped is called "high memory". 1680 1681 Depending on the selected kernel/user memory split, minimum 1682 vmalloc space and actual amount of RAM, you may not need this 1683 option which should result in a slightly faster kernel. 1684 1685 If unsure, say n. 1686 1687config HIGHPTE 1688 bool "Allocate 2nd-level pagetables from highmem" 1689 depends on HIGHMEM 1690 1691config HW_PERF_EVENTS 1692 bool "Enable hardware performance counter support for perf events" 1693 depends on PERF_EVENTS 1694 default y 1695 help 1696 Enable hardware performance counter support for perf events. If 1697 disabled, perf events will use software events only. 1698 1699config SYS_SUPPORTS_HUGETLBFS 1700 def_bool y 1701 depends on ARM_LPAE 1702 1703config HAVE_ARCH_TRANSPARENT_HUGEPAGE 1704 def_bool y 1705 depends on ARM_LPAE 1706 1707config ARCH_WANT_GENERAL_HUGETLB 1708 def_bool y 1709 1710source "mm/Kconfig" 1711 1712config FORCE_MAX_ZONEORDER 1713 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY 1714 range 11 64 if ARCH_SHMOBILE_LEGACY 1715 default "12" if SOC_AM33XX 1716 default "9" if SA1111 || ARCH_EFM32 1717 default "11" 1718 help 1719 The kernel memory allocator divides physically contiguous memory 1720 blocks into "zones", where each zone is a power of two number of 1721 pages. This option selects the largest power of two that the kernel 1722 keeps in the memory allocator. If you need to allocate very large 1723 blocks of physically contiguous memory, then you may need to 1724 increase this value. 1725 1726 This config option is actually maximum order plus one. For example, 1727 a value of 11 means that the largest free memory block is 2^10 pages. 1728 1729config ALIGNMENT_TRAP 1730 bool 1731 depends on CPU_CP15_MMU 1732 default y if !ARCH_EBSA110 1733 select HAVE_PROC_CPU if PROC_FS 1734 help 1735 ARM processors cannot fetch/store information which is not 1736 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1737 address divisible by 4. On 32-bit ARM processors, these non-aligned 1738 fetch/store instructions will be emulated in software if you say 1739 here, which has a severe performance impact. This is necessary for 1740 correct operation of some network protocols. With an IP-only 1741 configuration it is safe to say N, otherwise say Y. 1742 1743config UACCESS_WITH_MEMCPY 1744 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1745 depends on MMU 1746 default y if CPU_FEROCEON 1747 help 1748 Implement faster copy_to_user and clear_user methods for CPU 1749 cores where a 8-word STM instruction give significantly higher 1750 memory write throughput than a sequence of individual 32bit stores. 1751 1752 A possible side effect is a slight increase in scheduling latency 1753 between threads sharing the same address space if they invoke 1754 such copy operations with large buffers. 1755 1756 However, if the CPU data cache is using a write-allocate mode, 1757 this option is unlikely to provide any performance gain. 1758 1759config SECCOMP 1760 bool 1761 prompt "Enable seccomp to safely compute untrusted bytecode" 1762 ---help--- 1763 This kernel feature is useful for number crunching applications 1764 that may need to compute untrusted bytecode during their 1765 execution. By using pipes or other transports made available to 1766 the process as file descriptors supporting the read/write 1767 syscalls, it's possible to isolate those applications in 1768 their own address space using seccomp. Once seccomp is 1769 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1770 and the task is only allowed to execute a few safe syscalls 1771 defined by each seccomp mode. 1772 1773config SWIOTLB 1774 def_bool y 1775 1776config IOMMU_HELPER 1777 def_bool SWIOTLB 1778 1779config XEN_DOM0 1780 def_bool y 1781 depends on XEN 1782 1783config XEN 1784 bool "Xen guest support on ARM" 1785 depends on ARM && AEABI && OF 1786 depends on CPU_V7 && !CPU_V6 1787 depends on !GENERIC_ATOMIC64 1788 depends on MMU 1789 select ARCH_DMA_ADDR_T_64BIT 1790 select ARM_PSCI 1791 select SWIOTLB_XEN 1792 help 1793 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1794 1795endmenu 1796 1797menu "Boot options" 1798 1799config USE_OF 1800 bool "Flattened Device Tree support" 1801 select IRQ_DOMAIN 1802 select OF 1803 select OF_EARLY_FLATTREE 1804 select OF_RESERVED_MEM 1805 help 1806 Include support for flattened device tree machine descriptions. 1807 1808config ATAGS 1809 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1810 default y 1811 help 1812 This is the traditional way of passing data to the kernel at boot 1813 time. If you are solely relying on the flattened device tree (or 1814 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1815 to remove ATAGS support from your kernel binary. If unsure, 1816 leave this to y. 1817 1818config DEPRECATED_PARAM_STRUCT 1819 bool "Provide old way to pass kernel parameters" 1820 depends on ATAGS 1821 help 1822 This was deprecated in 2001 and announced to live on for 5 years. 1823 Some old boot loaders still use this way. 1824 1825# Compressed boot loader in ROM. Yes, we really want to ask about 1826# TEXT and BSS so we preserve their values in the config files. 1827config ZBOOT_ROM_TEXT 1828 hex "Compressed ROM boot loader base address" 1829 default "0" 1830 help 1831 The physical address at which the ROM-able zImage is to be 1832 placed in the target. Platforms which normally make use of 1833 ROM-able zImage formats normally set this to a suitable 1834 value in their defconfig file. 1835 1836 If ZBOOT_ROM is not enabled, this has no effect. 1837 1838config ZBOOT_ROM_BSS 1839 hex "Compressed ROM boot loader BSS address" 1840 default "0" 1841 help 1842 The base address of an area of read/write memory in the target 1843 for the ROM-able zImage which must be available while the 1844 decompressor is running. It must be large enough to hold the 1845 entire decompressed kernel plus an additional 128 KiB. 1846 Platforms which normally make use of ROM-able zImage formats 1847 normally set this to a suitable value in their defconfig file. 1848 1849 If ZBOOT_ROM is not enabled, this has no effect. 1850 1851config ZBOOT_ROM 1852 bool "Compressed boot loader in ROM/flash" 1853 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1854 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1855 help 1856 Say Y here if you intend to execute your compressed kernel image 1857 (zImage) directly from ROM or flash. If unsure, say N. 1858 1859choice 1860 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)" 1861 depends on ZBOOT_ROM && ARCH_SH7372 1862 default ZBOOT_ROM_NONE 1863 help 1864 Include experimental SD/MMC loading code in the ROM-able zImage. 1865 With this enabled it is possible to write the ROM-able zImage 1866 kernel image to an MMC or SD card and boot the kernel straight 1867 from the reset vector. At reset the processor Mask ROM will load 1868 the first part of the ROM-able zImage which in turn loads the 1869 rest the kernel image to RAM. 1870 1871config ZBOOT_ROM_NONE 1872 bool "No SD/MMC loader in zImage (EXPERIMENTAL)" 1873 help 1874 Do not load image from SD or MMC 1875 1876config ZBOOT_ROM_MMCIF 1877 bool "Include MMCIF loader in zImage (EXPERIMENTAL)" 1878 help 1879 Load image from MMCIF hardware block. 1880 1881config ZBOOT_ROM_SH_MOBILE_SDHI 1882 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)" 1883 help 1884 Load image from SDHI hardware block 1885 1886endchoice 1887 1888config ARM_APPENDED_DTB 1889 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1890 depends on OF 1891 help 1892 With this option, the boot code will look for a device tree binary 1893 (DTB) appended to zImage 1894 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1895 1896 This is meant as a backward compatibility convenience for those 1897 systems with a bootloader that can't be upgraded to accommodate 1898 the documented boot protocol using a device tree. 1899 1900 Beware that there is very little in terms of protection against 1901 this option being confused by leftover garbage in memory that might 1902 look like a DTB header after a reboot if no actual DTB is appended 1903 to zImage. Do not leave this option active in a production kernel 1904 if you don't intend to always append a DTB. Proper passing of the 1905 location into r2 of a bootloader provided DTB is always preferable 1906 to this option. 1907 1908config ARM_ATAG_DTB_COMPAT 1909 bool "Supplement the appended DTB with traditional ATAG information" 1910 depends on ARM_APPENDED_DTB 1911 help 1912 Some old bootloaders can't be updated to a DTB capable one, yet 1913 they provide ATAGs with memory configuration, the ramdisk address, 1914 the kernel cmdline string, etc. Such information is dynamically 1915 provided by the bootloader and can't always be stored in a static 1916 DTB. To allow a device tree enabled kernel to be used with such 1917 bootloaders, this option allows zImage to extract the information 1918 from the ATAG list and store it at run time into the appended DTB. 1919 1920choice 1921 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1922 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1923 1924config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1925 bool "Use bootloader kernel arguments if available" 1926 help 1927 Uses the command-line options passed by the boot loader instead of 1928 the device tree bootargs property. If the boot loader doesn't provide 1929 any, the device tree bootargs property will be used. 1930 1931config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1932 bool "Extend with bootloader kernel arguments" 1933 help 1934 The command-line arguments provided by the boot loader will be 1935 appended to the the device tree bootargs property. 1936 1937endchoice 1938 1939config CMDLINE 1940 string "Default kernel command string" 1941 default "" 1942 help 1943 On some architectures (EBSA110 and CATS), there is currently no way 1944 for the boot loader to pass arguments to the kernel. For these 1945 architectures, you should supply some command-line options at build 1946 time by entering them here. As a minimum, you should specify the 1947 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1948 1949choice 1950 prompt "Kernel command line type" if CMDLINE != "" 1951 default CMDLINE_FROM_BOOTLOADER 1952 depends on ATAGS 1953 1954config CMDLINE_FROM_BOOTLOADER 1955 bool "Use bootloader kernel arguments if available" 1956 help 1957 Uses the command-line options passed by the boot loader. If 1958 the boot loader doesn't provide any, the default kernel command 1959 string provided in CMDLINE will be used. 1960 1961config CMDLINE_EXTEND 1962 bool "Extend bootloader kernel arguments" 1963 help 1964 The command-line arguments provided by the boot loader will be 1965 appended to the default kernel command string. 1966 1967config CMDLINE_FORCE 1968 bool "Always use the default kernel command string" 1969 help 1970 Always use the default kernel command string, even if the boot 1971 loader passes other arguments to the kernel. 1972 This is useful if you cannot or don't want to change the 1973 command-line options your boot loader passes to the kernel. 1974endchoice 1975 1976config XIP_KERNEL 1977 bool "Kernel Execute-In-Place from ROM" 1978 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1979 help 1980 Execute-In-Place allows the kernel to run from non-volatile storage 1981 directly addressable by the CPU, such as NOR flash. This saves RAM 1982 space since the text section of the kernel is not loaded from flash 1983 to RAM. Read-write sections, such as the data section and stack, 1984 are still copied to RAM. The XIP kernel is not compressed since 1985 it has to run directly from flash, so it will take more space to 1986 store it. The flash address used to link the kernel object files, 1987 and for storing it, is configuration dependent. Therefore, if you 1988 say Y here, you must know the proper physical address where to 1989 store the kernel image depending on your own flash memory usage. 1990 1991 Also note that the make target becomes "make xipImage" rather than 1992 "make zImage" or "make Image". The final kernel binary to put in 1993 ROM memory will be arch/arm/boot/xipImage. 1994 1995 If unsure, say N. 1996 1997config XIP_PHYS_ADDR 1998 hex "XIP Kernel Physical Location" 1999 depends on XIP_KERNEL 2000 default "0x00080000" 2001 help 2002 This is the physical address in your flash memory the kernel will 2003 be linked for and stored to. This address is dependent on your 2004 own flash usage. 2005 2006config KEXEC 2007 bool "Kexec system call (EXPERIMENTAL)" 2008 depends on (!SMP || PM_SLEEP_SMP) 2009 help 2010 kexec is a system call that implements the ability to shutdown your 2011 current kernel, and to start another kernel. It is like a reboot 2012 but it is independent of the system firmware. And like a reboot 2013 you can start any kernel with it, not just Linux. 2014 2015 It is an ongoing process to be certain the hardware in a machine 2016 is properly shutdown, so do not be surprised if this code does not 2017 initially work for you. 2018 2019config ATAGS_PROC 2020 bool "Export atags in procfs" 2021 depends on ATAGS && KEXEC 2022 default y 2023 help 2024 Should the atags used to boot the kernel be exported in an "atags" 2025 file in procfs. Useful with kexec. 2026 2027config CRASH_DUMP 2028 bool "Build kdump crash kernel (EXPERIMENTAL)" 2029 help 2030 Generate crash dump after being started by kexec. This should 2031 be normally only set in special crash dump kernels which are 2032 loaded in the main kernel with kexec-tools into a specially 2033 reserved region and then later executed after a crash by 2034 kdump/kexec. The crash dump kernel must be compiled to a 2035 memory address not used by the main kernel 2036 2037 For more details see Documentation/kdump/kdump.txt 2038 2039config AUTO_ZRELADDR 2040 bool "Auto calculation of the decompressed kernel image address" 2041 help 2042 ZRELADDR is the physical address where the decompressed kernel 2043 image will be placed. If AUTO_ZRELADDR is selected, the address 2044 will be determined at run-time by masking the current IP with 2045 0xf8000000. This assumes the zImage being placed in the first 128MB 2046 from start of memory. 2047 2048endmenu 2049 2050menu "CPU Power Management" 2051 2052source "drivers/cpufreq/Kconfig" 2053 2054source "drivers/cpuidle/Kconfig" 2055 2056endmenu 2057 2058menu "Floating point emulation" 2059 2060comment "At least one emulation must be selected" 2061 2062config FPE_NWFPE 2063 bool "NWFPE math emulation" 2064 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2065 ---help--- 2066 Say Y to include the NWFPE floating point emulator in the kernel. 2067 This is necessary to run most binaries. Linux does not currently 2068 support floating point hardware so you need to say Y here even if 2069 your machine has an FPA or floating point co-processor podule. 2070 2071 You may say N here if you are going to load the Acorn FPEmulator 2072 early in the bootup. 2073 2074config FPE_NWFPE_XP 2075 bool "Support extended precision" 2076 depends on FPE_NWFPE 2077 help 2078 Say Y to include 80-bit support in the kernel floating-point 2079 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2080 Note that gcc does not generate 80-bit operations by default, 2081 so in most cases this option only enlarges the size of the 2082 floating point emulator without any good reason. 2083 2084 You almost surely want to say N here. 2085 2086config FPE_FASTFPE 2087 bool "FastFPE math emulation (EXPERIMENTAL)" 2088 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2089 ---help--- 2090 Say Y here to include the FAST floating point emulator in the kernel. 2091 This is an experimental much faster emulator which now also has full 2092 precision for the mantissa. It does not support any exceptions. 2093 It is very simple, and approximately 3-6 times faster than NWFPE. 2094 2095 It should be sufficient for most programs. It may be not suitable 2096 for scientific calculations, but you have to check this for yourself. 2097 If you do not feel you need a faster FP emulation you should better 2098 choose NWFPE. 2099 2100config VFP 2101 bool "VFP-format floating point maths" 2102 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2103 help 2104 Say Y to include VFP support code in the kernel. This is needed 2105 if your hardware includes a VFP unit. 2106 2107 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2108 release notes and additional status information. 2109 2110 Say N if your target does not have VFP hardware. 2111 2112config VFPv3 2113 bool 2114 depends on VFP 2115 default y if CPU_V7 2116 2117config NEON 2118 bool "Advanced SIMD (NEON) Extension support" 2119 depends on VFPv3 && CPU_V7 2120 help 2121 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2122 Extension. 2123 2124config KERNEL_MODE_NEON 2125 bool "Support for NEON in kernel mode" 2126 depends on NEON && AEABI 2127 help 2128 Say Y to include support for NEON in kernel mode. 2129 2130endmenu 2131 2132menu "Userspace binary formats" 2133 2134source "fs/Kconfig.binfmt" 2135 2136endmenu 2137 2138menu "Power management options" 2139 2140source "kernel/power/Kconfig" 2141 2142config ARCH_SUSPEND_POSSIBLE 2143 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 2144 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2145 def_bool y 2146 2147config ARM_CPU_SUSPEND 2148 def_bool PM_SLEEP 2149 2150config ARCH_HIBERNATION_POSSIBLE 2151 bool 2152 depends on MMU 2153 default y if ARCH_SUSPEND_POSSIBLE 2154 2155endmenu 2156 2157source "net/Kconfig" 2158 2159source "drivers/Kconfig" 2160 2161source "fs/Kconfig" 2162 2163source "arch/arm/Kconfig.debug" 2164 2165source "security/Kconfig" 2166 2167source "crypto/Kconfig" 2168if CRYPTO 2169source "arch/arm/crypto/Kconfig" 2170endif 2171 2172source "lib/Kconfig" 2173 2174source "arch/arm/kvm/Kconfig" 2175