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 EDAC_SUPPORT 19 select EDAC_ATOMIC_SCRUB 20 select GENERIC_ALLOCATOR 21 select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI) 22 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 23 select GENERIC_IDLE_POLL_SETUP 24 select GENERIC_IRQ_PROBE 25 select GENERIC_IRQ_SHOW 26 select GENERIC_IRQ_SHOW_LEVEL 27 select GENERIC_PCI_IOMAP 28 select GENERIC_SCHED_CLOCK 29 select GENERIC_SMP_IDLE_THREAD 30 select GENERIC_STRNCPY_FROM_USER 31 select GENERIC_STRNLEN_USER 32 select HANDLE_DOMAIN_IRQ 33 select HARDIRQS_SW_RESEND 34 select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT) 35 select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 36 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 37 select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 38 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) 39 select HAVE_ARCH_TRACEHOOK 40 select HAVE_BPF_JIT 41 select HAVE_CC_STACKPROTECTOR 42 select HAVE_CONTEXT_TRACKING 43 select HAVE_C_RECORDMCOUNT 44 select HAVE_DEBUG_KMEMLEAK 45 select HAVE_DMA_API_DEBUG 46 select HAVE_DMA_ATTRS 47 select HAVE_DMA_CONTIGUOUS if MMU 48 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32 49 select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU 50 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL) 51 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL) 52 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL) 53 select HAVE_GENERIC_DMA_COHERENT 54 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)) 55 select HAVE_IDE if PCI || ISA || PCMCIA 56 select HAVE_IRQ_TIME_ACCOUNTING 57 select HAVE_KERNEL_GZIP 58 select HAVE_KERNEL_LZ4 59 select HAVE_KERNEL_LZMA 60 select HAVE_KERNEL_LZO 61 select HAVE_KERNEL_XZ 62 select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M 63 select HAVE_KRETPROBES if (HAVE_KPROBES) 64 select HAVE_MEMBLOCK 65 select HAVE_MOD_ARCH_SPECIFIC 66 select HAVE_OPROFILE if (HAVE_PERF_EVENTS) 67 select HAVE_OPTPROBES if !THUMB2_KERNEL 68 select HAVE_PERF_EVENTS 69 select HAVE_PERF_REGS 70 select HAVE_PERF_USER_STACK_DUMP 71 select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE) 72 select HAVE_REGS_AND_STACK_ACCESS_API 73 select HAVE_SYSCALL_TRACEPOINTS 74 select HAVE_UID16 75 select HAVE_VIRT_CPU_ACCOUNTING_GEN 76 select IRQ_FORCED_THREADING 77 select MODULES_USE_ELF_REL 78 select NO_BOOTMEM 79 select OLD_SIGACTION 80 select OLD_SIGSUSPEND3 81 select PERF_USE_VMALLOC 82 select RTC_LIB 83 select SYS_SUPPORTS_APM_EMULATION 84 # Above selects are sorted alphabetically; please add new ones 85 # according to that. Thanks. 86 help 87 The ARM series is a line of low-power-consumption RISC chip designs 88 licensed by ARM Ltd and targeted at embedded applications and 89 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 90 manufactured, but legacy ARM-based PC hardware remains popular in 91 Europe. There is an ARM Linux project with a web page at 92 <http://www.arm.linux.org.uk/>. 93 94config ARM_HAS_SG_CHAIN 95 select ARCH_HAS_SG_CHAIN 96 bool 97 98config NEED_SG_DMA_LENGTH 99 bool 100 101config ARM_DMA_USE_IOMMU 102 bool 103 select ARM_HAS_SG_CHAIN 104 select NEED_SG_DMA_LENGTH 105 106if ARM_DMA_USE_IOMMU 107 108config ARM_DMA_IOMMU_ALIGNMENT 109 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" 110 range 4 9 111 default 8 112 help 113 DMA mapping framework by default aligns all buffers to the smallest 114 PAGE_SIZE order which is greater than or equal to the requested buffer 115 size. This works well for buffers up to a few hundreds kilobytes, but 116 for larger buffers it just a waste of address space. Drivers which has 117 relatively small addressing window (like 64Mib) might run out of 118 virtual space with just a few allocations. 119 120 With this parameter you can specify the maximum PAGE_SIZE order for 121 DMA IOMMU buffers. Larger buffers will be aligned only to this 122 specified order. The order is expressed as a power of two multiplied 123 by the PAGE_SIZE. 124 125endif 126 127config MIGHT_HAVE_PCI 128 bool 129 130config SYS_SUPPORTS_APM_EMULATION 131 bool 132 133config HAVE_TCM 134 bool 135 select GENERIC_ALLOCATOR 136 137config HAVE_PROC_CPU 138 bool 139 140config NO_IOPORT_MAP 141 bool 142 143config EISA 144 bool 145 ---help--- 146 The Extended Industry Standard Architecture (EISA) bus was 147 developed as an open alternative to the IBM MicroChannel bus. 148 149 The EISA bus provided some of the features of the IBM MicroChannel 150 bus while maintaining backward compatibility with cards made for 151 the older ISA bus. The EISA bus saw limited use between 1988 and 152 1995 when it was made obsolete by the PCI bus. 153 154 Say Y here if you are building a kernel for an EISA-based machine. 155 156 Otherwise, say N. 157 158config SBUS 159 bool 160 161config STACKTRACE_SUPPORT 162 bool 163 default y 164 165config HAVE_LATENCYTOP_SUPPORT 166 bool 167 depends on !SMP 168 default y 169 170config LOCKDEP_SUPPORT 171 bool 172 default y 173 174config TRACE_IRQFLAGS_SUPPORT 175 bool 176 default !CPU_V7M 177 178config RWSEM_XCHGADD_ALGORITHM 179 bool 180 default y 181 182config ARCH_HAS_ILOG2_U32 183 bool 184 185config ARCH_HAS_ILOG2_U64 186 bool 187 188config ARCH_HAS_BANDGAP 189 bool 190 191config FIX_EARLYCON_MEM 192 def_bool y if MMU 193 194config GENERIC_HWEIGHT 195 bool 196 default y 197 198config GENERIC_CALIBRATE_DELAY 199 bool 200 default y 201 202config ARCH_MAY_HAVE_PC_FDC 203 bool 204 205config ZONE_DMA 206 bool 207 208config NEED_DMA_MAP_STATE 209 def_bool y 210 211config ARCH_SUPPORTS_UPROBES 212 def_bool y 213 214config ARCH_HAS_DMA_SET_COHERENT_MASK 215 bool 216 217config GENERIC_ISA_DMA 218 bool 219 220config FIQ 221 bool 222 223config NEED_RET_TO_USER 224 bool 225 226config ARCH_MTD_XIP 227 bool 228 229config VECTORS_BASE 230 hex 231 default 0xffff0000 if MMU || CPU_HIGH_VECTOR 232 default DRAM_BASE if REMAP_VECTORS_TO_RAM 233 default 0x00000000 234 help 235 The base address of exception vectors. This must be two pages 236 in size. 237 238config ARM_PATCH_PHYS_VIRT 239 bool "Patch physical to virtual translations at runtime" if EMBEDDED 240 default y 241 depends on !XIP_KERNEL && MMU 242 depends on !ARCH_REALVIEW || !SPARSEMEM 243 help 244 Patch phys-to-virt and virt-to-phys translation functions at 245 boot and module load time according to the position of the 246 kernel in system memory. 247 248 This can only be used with non-XIP MMU kernels where the base 249 of physical memory is at a 16MB boundary. 250 251 Only disable this option if you know that you do not require 252 this feature (eg, building a kernel for a single machine) and 253 you need to shrink the kernel to the minimal size. 254 255config NEED_MACH_IO_H 256 bool 257 help 258 Select this when mach/io.h is required to provide special 259 definitions for this platform. The need for mach/io.h should 260 be avoided when possible. 261 262config NEED_MACH_MEMORY_H 263 bool 264 help 265 Select this when mach/memory.h is required to provide special 266 definitions for this platform. The need for mach/memory.h should 267 be avoided when possible. 268 269config PHYS_OFFSET 270 hex "Physical address of main memory" if MMU 271 depends on !ARM_PATCH_PHYS_VIRT 272 default DRAM_BASE if !MMU 273 default 0x00000000 if ARCH_EBSA110 || \ 274 ARCH_FOOTBRIDGE || \ 275 ARCH_INTEGRATOR || \ 276 ARCH_IOP13XX || \ 277 ARCH_KS8695 || \ 278 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET) 279 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC 280 default 0x20000000 if ARCH_S5PV210 281 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET 282 default 0xc0000000 if ARCH_SA1100 283 help 284 Please provide the physical address corresponding to the 285 location of main memory in your system. 286 287config GENERIC_BUG 288 def_bool y 289 depends on BUG 290 291config PGTABLE_LEVELS 292 int 293 default 3 if ARM_LPAE 294 default 2 295 296source "init/Kconfig" 297 298source "kernel/Kconfig.freezer" 299 300menu "System Type" 301 302config MMU 303 bool "MMU-based Paged Memory Management Support" 304 default y 305 help 306 Select if you want MMU-based virtualised addressing space 307 support by paged memory management. If unsure, say 'Y'. 308 309# 310# The "ARM system type" choice list is ordered alphabetically by option 311# text. Please add new entries in the option alphabetic order. 312# 313choice 314 prompt "ARM system type" 315 default ARCH_VERSATILE if !MMU 316 default ARCH_MULTIPLATFORM if MMU 317 318config ARCH_MULTIPLATFORM 319 bool "Allow multiple platforms to be selected" 320 depends on MMU 321 select ARCH_WANT_OPTIONAL_GPIOLIB 322 select ARM_HAS_SG_CHAIN 323 select ARM_PATCH_PHYS_VIRT 324 select AUTO_ZRELADDR 325 select CLKSRC_OF 326 select COMMON_CLK 327 select GENERIC_CLOCKEVENTS 328 select MIGHT_HAVE_PCI 329 select MULTI_IRQ_HANDLER 330 select SPARSE_IRQ 331 select USE_OF 332 333config ARM_SINGLE_ARMV7M 334 bool "ARMv7-M based platforms (Cortex-M0/M3/M4)" 335 depends on !MMU 336 select ARCH_WANT_OPTIONAL_GPIOLIB 337 select ARM_NVIC 338 select AUTO_ZRELADDR 339 select CLKSRC_OF 340 select COMMON_CLK 341 select CPU_V7M 342 select GENERIC_CLOCKEVENTS 343 select NO_IOPORT_MAP 344 select SPARSE_IRQ 345 select USE_OF 346 347config ARCH_REALVIEW 348 bool "ARM Ltd. RealView family" 349 select ARCH_WANT_OPTIONAL_GPIOLIB 350 select ARM_AMBA 351 select ARM_TIMER_SP804 352 select COMMON_CLK 353 select COMMON_CLK_VERSATILE 354 select GENERIC_CLOCKEVENTS 355 select GPIO_PL061 if GPIOLIB 356 select ICST 357 select NEED_MACH_MEMORY_H 358 select PLAT_VERSATILE 359 select PLAT_VERSATILE_SCHED_CLOCK 360 help 361 This enables support for ARM Ltd RealView boards. 362 363config ARCH_VERSATILE 364 bool "ARM Ltd. Versatile family" 365 select ARCH_WANT_OPTIONAL_GPIOLIB 366 select ARM_AMBA 367 select ARM_TIMER_SP804 368 select ARM_VIC 369 select CLKDEV_LOOKUP 370 select GENERIC_CLOCKEVENTS 371 select HAVE_MACH_CLKDEV 372 select ICST 373 select PLAT_VERSATILE 374 select PLAT_VERSATILE_CLOCK 375 select PLAT_VERSATILE_SCHED_CLOCK 376 select VERSATILE_FPGA_IRQ 377 help 378 This enables support for ARM Ltd Versatile board. 379 380config ARCH_CLPS711X 381 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based" 382 select ARCH_REQUIRE_GPIOLIB 383 select AUTO_ZRELADDR 384 select CLKSRC_MMIO 385 select COMMON_CLK 386 select CPU_ARM720T 387 select GENERIC_CLOCKEVENTS 388 select MFD_SYSCON 389 select SOC_BUS 390 help 391 Support for Cirrus Logic 711x/721x/731x based boards. 392 393config ARCH_GEMINI 394 bool "Cortina Systems Gemini" 395 select ARCH_REQUIRE_GPIOLIB 396 select CLKSRC_MMIO 397 select CPU_FA526 398 select GENERIC_CLOCKEVENTS 399 help 400 Support for the Cortina Systems Gemini family SoCs 401 402config ARCH_EBSA110 403 bool "EBSA-110" 404 select ARCH_USES_GETTIMEOFFSET 405 select CPU_SA110 406 select ISA 407 select NEED_MACH_IO_H 408 select NEED_MACH_MEMORY_H 409 select NO_IOPORT_MAP 410 help 411 This is an evaluation board for the StrongARM processor available 412 from Digital. It has limited hardware on-board, including an 413 Ethernet interface, two PCMCIA sockets, two serial ports and a 414 parallel port. 415 416config ARCH_EP93XX 417 bool "EP93xx-based" 418 select ARCH_HAS_HOLES_MEMORYMODEL 419 select ARCH_REQUIRE_GPIOLIB 420 select ARM_AMBA 421 select ARM_PATCH_PHYS_VIRT 422 select ARM_VIC 423 select AUTO_ZRELADDR 424 select CLKDEV_LOOKUP 425 select CLKSRC_MMIO 426 select CPU_ARM920T 427 select GENERIC_CLOCKEVENTS 428 help 429 This enables support for the Cirrus EP93xx series of CPUs. 430 431config ARCH_FOOTBRIDGE 432 bool "FootBridge" 433 select CPU_SA110 434 select FOOTBRIDGE 435 select GENERIC_CLOCKEVENTS 436 select HAVE_IDE 437 select NEED_MACH_IO_H if !MMU 438 select NEED_MACH_MEMORY_H 439 help 440 Support for systems based on the DC21285 companion chip 441 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 442 443config ARCH_NETX 444 bool "Hilscher NetX based" 445 select ARM_VIC 446 select CLKSRC_MMIO 447 select CPU_ARM926T 448 select GENERIC_CLOCKEVENTS 449 help 450 This enables support for systems based on the Hilscher NetX Soc 451 452config ARCH_IOP13XX 453 bool "IOP13xx-based" 454 depends on MMU 455 select CPU_XSC3 456 select NEED_MACH_MEMORY_H 457 select NEED_RET_TO_USER 458 select PCI 459 select PLAT_IOP 460 select VMSPLIT_1G 461 select SPARSE_IRQ 462 help 463 Support for Intel's IOP13XX (XScale) family of processors. 464 465config ARCH_IOP32X 466 bool "IOP32x-based" 467 depends on MMU 468 select ARCH_REQUIRE_GPIOLIB 469 select CPU_XSCALE 470 select GPIO_IOP 471 select NEED_RET_TO_USER 472 select PCI 473 select PLAT_IOP 474 help 475 Support for Intel's 80219 and IOP32X (XScale) family of 476 processors. 477 478config ARCH_IOP33X 479 bool "IOP33x-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 IOP33X (XScale) family of processors. 489 490config ARCH_IXP4XX 491 bool "IXP4xx-based" 492 depends on MMU 493 select ARCH_HAS_DMA_SET_COHERENT_MASK 494 select ARCH_REQUIRE_GPIOLIB 495 select ARCH_SUPPORTS_BIG_ENDIAN 496 select CLKSRC_MMIO 497 select CPU_XSCALE 498 select DMABOUNCE if PCI 499 select GENERIC_CLOCKEVENTS 500 select MIGHT_HAVE_PCI 501 select NEED_MACH_IO_H 502 select USB_EHCI_BIG_ENDIAN_DESC 503 select USB_EHCI_BIG_ENDIAN_MMIO 504 help 505 Support for Intel's IXP4XX (XScale) family of processors. 506 507config ARCH_DOVE 508 bool "Marvell Dove" 509 select ARCH_REQUIRE_GPIOLIB 510 select CPU_PJ4 511 select GENERIC_CLOCKEVENTS 512 select MIGHT_HAVE_PCI 513 select MVEBU_MBUS 514 select PINCTRL 515 select PINCTRL_DOVE 516 select PLAT_ORION_LEGACY 517 help 518 Support for the Marvell Dove SoC 88AP510 519 520config ARCH_MV78XX0 521 bool "Marvell MV78xx0" 522 select ARCH_REQUIRE_GPIOLIB 523 select CPU_FEROCEON 524 select GENERIC_CLOCKEVENTS 525 select MVEBU_MBUS 526 select PCI 527 select PLAT_ORION_LEGACY 528 help 529 Support for the following Marvell MV78xx0 series SoCs: 530 MV781x0, MV782x0. 531 532config ARCH_ORION5X 533 bool "Marvell Orion" 534 depends on MMU 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 select MULTI_IRQ_HANDLER 542 help 543 Support for the following Marvell Orion 5x series SoCs: 544 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 545 Orion-2 (5281), Orion-1-90 (6183). 546 547config ARCH_MMP 548 bool "Marvell PXA168/910/MMP2" 549 depends on MMU 550 select ARCH_REQUIRE_GPIOLIB 551 select CLKDEV_LOOKUP 552 select GENERIC_ALLOCATOR 553 select GENERIC_CLOCKEVENTS 554 select GPIO_PXA 555 select IRQ_DOMAIN 556 select MULTI_IRQ_HANDLER 557 select PINCTRL 558 select PLAT_PXA 559 select SPARSE_IRQ 560 help 561 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 562 563config ARCH_KS8695 564 bool "Micrel/Kendin KS8695" 565 select ARCH_REQUIRE_GPIOLIB 566 select CLKSRC_MMIO 567 select CPU_ARM922T 568 select GENERIC_CLOCKEVENTS 569 select NEED_MACH_MEMORY_H 570 help 571 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 572 System-on-Chip devices. 573 574config ARCH_W90X900 575 bool "Nuvoton W90X900 CPU" 576 select ARCH_REQUIRE_GPIOLIB 577 select CLKDEV_LOOKUP 578 select CLKSRC_MMIO 579 select CPU_ARM926T 580 select GENERIC_CLOCKEVENTS 581 help 582 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 583 At present, the w90x900 has been renamed nuc900, regarding 584 the ARM series product line, you can login the following 585 link address to know more. 586 587 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 588 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 589 590config ARCH_LPC32XX 591 bool "NXP LPC32XX" 592 select ARCH_REQUIRE_GPIOLIB 593 select ARM_AMBA 594 select CLKDEV_LOOKUP 595 select CLKSRC_MMIO 596 select CPU_ARM926T 597 select GENERIC_CLOCKEVENTS 598 select HAVE_IDE 599 select USE_OF 600 help 601 Support for the NXP LPC32XX family of processors 602 603config ARCH_PXA 604 bool "PXA2xx/PXA3xx-based" 605 depends on MMU 606 select ARCH_MTD_XIP 607 select ARCH_REQUIRE_GPIOLIB 608 select ARM_CPU_SUSPEND if PM 609 select AUTO_ZRELADDR 610 select COMMON_CLK 611 select CLKDEV_LOOKUP 612 select CLKSRC_MMIO 613 select CLKSRC_OF 614 select GENERIC_CLOCKEVENTS 615 select GPIO_PXA 616 select HAVE_IDE 617 select IRQ_DOMAIN 618 select MULTI_IRQ_HANDLER 619 select PLAT_PXA 620 select SPARSE_IRQ 621 help 622 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 623 624config ARCH_RPC 625 bool "RiscPC" 626 select ARCH_ACORN 627 select ARCH_MAY_HAVE_PC_FDC 628 select ARCH_SPARSEMEM_ENABLE 629 select ARCH_USES_GETTIMEOFFSET 630 select CPU_SA110 631 select FIQ 632 select HAVE_IDE 633 select HAVE_PATA_PLATFORM 634 select ISA_DMA_API 635 select NEED_MACH_IO_H 636 select NEED_MACH_MEMORY_H 637 select NO_IOPORT_MAP 638 select VIRT_TO_BUS 639 help 640 On the Acorn Risc-PC, Linux can support the internal IDE disk and 641 CD-ROM interface, serial and parallel port, and the floppy drive. 642 643config ARCH_SA1100 644 bool "SA1100-based" 645 select ARCH_MTD_XIP 646 select ARCH_REQUIRE_GPIOLIB 647 select ARCH_SPARSEMEM_ENABLE 648 select CLKDEV_LOOKUP 649 select CLKSRC_MMIO 650 select CPU_FREQ 651 select CPU_SA1100 652 select GENERIC_CLOCKEVENTS 653 select HAVE_IDE 654 select IRQ_DOMAIN 655 select ISA 656 select MULTI_IRQ_HANDLER 657 select NEED_MACH_MEMORY_H 658 select SPARSE_IRQ 659 help 660 Support for StrongARM 11x0 based boards. 661 662config ARCH_S3C24XX 663 bool "Samsung S3C24XX SoCs" 664 select ARCH_REQUIRE_GPIOLIB 665 select ATAGS 666 select CLKDEV_LOOKUP 667 select CLKSRC_SAMSUNG_PWM 668 select GENERIC_CLOCKEVENTS 669 select GPIO_SAMSUNG 670 select HAVE_S3C2410_I2C if I2C 671 select HAVE_S3C2410_WATCHDOG if WATCHDOG 672 select HAVE_S3C_RTC if RTC_CLASS 673 select MULTI_IRQ_HANDLER 674 select NEED_MACH_IO_H 675 select SAMSUNG_ATAGS 676 help 677 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 678 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 679 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 680 Samsung SMDK2410 development board (and derivatives). 681 682config ARCH_S3C64XX 683 bool "Samsung S3C64XX" 684 select ARCH_REQUIRE_GPIOLIB 685 select ARM_AMBA 686 select ARM_VIC 687 select ATAGS 688 select CLKDEV_LOOKUP 689 select CLKSRC_SAMSUNG_PWM 690 select COMMON_CLK_SAMSUNG 691 select CPU_V6K 692 select GENERIC_CLOCKEVENTS 693 select GPIO_SAMSUNG 694 select HAVE_S3C2410_I2C if I2C 695 select HAVE_S3C2410_WATCHDOG if WATCHDOG 696 select HAVE_TCM 697 select NO_IOPORT_MAP 698 select PLAT_SAMSUNG 699 select PM_GENERIC_DOMAINS if PM 700 select S3C_DEV_NAND 701 select S3C_GPIO_TRACK 702 select SAMSUNG_ATAGS 703 select SAMSUNG_WAKEMASK 704 select SAMSUNG_WDT_RESET 705 help 706 Samsung S3C64XX series based systems 707 708config ARCH_DAVINCI 709 bool "TI DaVinci" 710 select ARCH_HAS_HOLES_MEMORYMODEL 711 select ARCH_REQUIRE_GPIOLIB 712 select CLKDEV_LOOKUP 713 select GENERIC_ALLOCATOR 714 select GENERIC_CLOCKEVENTS 715 select GENERIC_IRQ_CHIP 716 select HAVE_IDE 717 select TI_PRIV_EDMA 718 select USE_OF 719 select ZONE_DMA 720 help 721 Support for TI's DaVinci platform. 722 723config ARCH_OMAP1 724 bool "TI OMAP1" 725 depends on MMU 726 select ARCH_HAS_HOLES_MEMORYMODEL 727 select ARCH_OMAP 728 select ARCH_REQUIRE_GPIOLIB 729 select CLKDEV_LOOKUP 730 select CLKSRC_MMIO 731 select GENERIC_CLOCKEVENTS 732 select GENERIC_IRQ_CHIP 733 select HAVE_IDE 734 select IRQ_DOMAIN 735 select MULTI_IRQ_HANDLER 736 select NEED_MACH_IO_H if PCCARD 737 select NEED_MACH_MEMORY_H 738 select SPARSE_IRQ 739 help 740 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 741 742endchoice 743 744menu "Multiple platform selection" 745 depends on ARCH_MULTIPLATFORM 746 747comment "CPU Core family selection" 748 749config ARCH_MULTI_V4 750 bool "ARMv4 based platforms (FA526)" 751 depends on !ARCH_MULTI_V6_V7 752 select ARCH_MULTI_V4_V5 753 select CPU_FA526 754 755config ARCH_MULTI_V4T 756 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 757 depends on !ARCH_MULTI_V6_V7 758 select ARCH_MULTI_V4_V5 759 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 760 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 761 CPU_ARM925T || CPU_ARM940T) 762 763config ARCH_MULTI_V5 764 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 765 depends on !ARCH_MULTI_V6_V7 766 select ARCH_MULTI_V4_V5 767 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 768 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 769 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 770 771config ARCH_MULTI_V4_V5 772 bool 773 774config ARCH_MULTI_V6 775 bool "ARMv6 based platforms (ARM11)" 776 select ARCH_MULTI_V6_V7 777 select CPU_V6K 778 779config ARCH_MULTI_V7 780 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 781 default y 782 select ARCH_MULTI_V6_V7 783 select CPU_V7 784 select HAVE_SMP 785 786config ARCH_MULTI_V6_V7 787 bool 788 select MIGHT_HAVE_CACHE_L2X0 789 790config ARCH_MULTI_CPU_AUTO 791 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 792 select ARCH_MULTI_V5 793 794endmenu 795 796config ARCH_VIRT 797 bool "Dummy Virtual Machine" if ARCH_MULTI_V7 798 select ARM_AMBA 799 select ARM_GIC 800 select ARM_PSCI 801 select HAVE_ARM_ARCH_TIMER 802 803# 804# This is sorted alphabetically by mach-* pathname. However, plat-* 805# Kconfigs may be included either alphabetically (according to the 806# plat- suffix) or along side the corresponding mach-* source. 807# 808source "arch/arm/mach-mvebu/Kconfig" 809 810source "arch/arm/mach-alpine/Kconfig" 811 812source "arch/arm/mach-asm9260/Kconfig" 813 814source "arch/arm/mach-at91/Kconfig" 815 816source "arch/arm/mach-axxia/Kconfig" 817 818source "arch/arm/mach-bcm/Kconfig" 819 820source "arch/arm/mach-berlin/Kconfig" 821 822source "arch/arm/mach-clps711x/Kconfig" 823 824source "arch/arm/mach-cns3xxx/Kconfig" 825 826source "arch/arm/mach-davinci/Kconfig" 827 828source "arch/arm/mach-digicolor/Kconfig" 829 830source "arch/arm/mach-dove/Kconfig" 831 832source "arch/arm/mach-ep93xx/Kconfig" 833 834source "arch/arm/mach-footbridge/Kconfig" 835 836source "arch/arm/mach-gemini/Kconfig" 837 838source "arch/arm/mach-highbank/Kconfig" 839 840source "arch/arm/mach-hisi/Kconfig" 841 842source "arch/arm/mach-integrator/Kconfig" 843 844source "arch/arm/mach-iop32x/Kconfig" 845 846source "arch/arm/mach-iop33x/Kconfig" 847 848source "arch/arm/mach-iop13xx/Kconfig" 849 850source "arch/arm/mach-ixp4xx/Kconfig" 851 852source "arch/arm/mach-keystone/Kconfig" 853 854source "arch/arm/mach-ks8695/Kconfig" 855 856source "arch/arm/mach-meson/Kconfig" 857 858source "arch/arm/mach-moxart/Kconfig" 859 860source "arch/arm/mach-mv78xx0/Kconfig" 861 862source "arch/arm/mach-imx/Kconfig" 863 864source "arch/arm/mach-mediatek/Kconfig" 865 866source "arch/arm/mach-mxs/Kconfig" 867 868source "arch/arm/mach-netx/Kconfig" 869 870source "arch/arm/mach-nomadik/Kconfig" 871 872source "arch/arm/mach-nspire/Kconfig" 873 874source "arch/arm/plat-omap/Kconfig" 875 876source "arch/arm/mach-omap1/Kconfig" 877 878source "arch/arm/mach-omap2/Kconfig" 879 880source "arch/arm/mach-orion5x/Kconfig" 881 882source "arch/arm/mach-picoxcell/Kconfig" 883 884source "arch/arm/mach-pxa/Kconfig" 885source "arch/arm/plat-pxa/Kconfig" 886 887source "arch/arm/mach-mmp/Kconfig" 888 889source "arch/arm/mach-qcom/Kconfig" 890 891source "arch/arm/mach-realview/Kconfig" 892 893source "arch/arm/mach-rockchip/Kconfig" 894 895source "arch/arm/mach-sa1100/Kconfig" 896 897source "arch/arm/mach-socfpga/Kconfig" 898 899source "arch/arm/mach-spear/Kconfig" 900 901source "arch/arm/mach-sti/Kconfig" 902 903source "arch/arm/mach-s3c24xx/Kconfig" 904 905source "arch/arm/mach-s3c64xx/Kconfig" 906 907source "arch/arm/mach-s5pv210/Kconfig" 908 909source "arch/arm/mach-exynos/Kconfig" 910source "arch/arm/plat-samsung/Kconfig" 911 912source "arch/arm/mach-shmobile/Kconfig" 913 914source "arch/arm/mach-sunxi/Kconfig" 915 916source "arch/arm/mach-prima2/Kconfig" 917 918source "arch/arm/mach-tegra/Kconfig" 919 920source "arch/arm/mach-u300/Kconfig" 921 922source "arch/arm/mach-uniphier/Kconfig" 923 924source "arch/arm/mach-ux500/Kconfig" 925 926source "arch/arm/mach-versatile/Kconfig" 927 928source "arch/arm/mach-vexpress/Kconfig" 929source "arch/arm/plat-versatile/Kconfig" 930 931source "arch/arm/mach-vt8500/Kconfig" 932 933source "arch/arm/mach-w90x900/Kconfig" 934 935source "arch/arm/mach-zx/Kconfig" 936 937source "arch/arm/mach-zynq/Kconfig" 938 939# ARMv7-M architecture 940config ARCH_EFM32 941 bool "Energy Micro efm32" 942 depends on ARM_SINGLE_ARMV7M 943 select ARCH_REQUIRE_GPIOLIB 944 help 945 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko 946 processors. 947 948config ARCH_LPC18XX 949 bool "NXP LPC18xx/LPC43xx" 950 depends on ARM_SINGLE_ARMV7M 951 select ARCH_HAS_RESET_CONTROLLER 952 select ARM_AMBA 953 select CLKSRC_LPC32XX 954 select PINCTRL 955 help 956 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4 957 high performance microcontrollers. 958 959config ARCH_STM32 960 bool "STMicrolectronics STM32" 961 depends on ARM_SINGLE_ARMV7M 962 select ARCH_HAS_RESET_CONTROLLER 963 select ARMV7M_SYSTICK 964 select CLKSRC_STM32 965 select RESET_CONTROLLER 966 help 967 Support for STMicroelectronics STM32 processors. 968 969# Definitions to make life easier 970config ARCH_ACORN 971 bool 972 973config PLAT_IOP 974 bool 975 select GENERIC_CLOCKEVENTS 976 977config PLAT_ORION 978 bool 979 select CLKSRC_MMIO 980 select COMMON_CLK 981 select GENERIC_IRQ_CHIP 982 select IRQ_DOMAIN 983 984config PLAT_ORION_LEGACY 985 bool 986 select PLAT_ORION 987 988config PLAT_PXA 989 bool 990 991config PLAT_VERSATILE 992 bool 993 994source "arch/arm/firmware/Kconfig" 995 996source arch/arm/mm/Kconfig 997 998config IWMMXT 999 bool "Enable iWMMXt support" 1000 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 1001 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 1002 help 1003 Enable support for iWMMXt context switching at run time if 1004 running on a CPU that supports it. 1005 1006config MULTI_IRQ_HANDLER 1007 bool 1008 help 1009 Allow each machine to specify it's own IRQ handler at run time. 1010 1011if !MMU 1012source "arch/arm/Kconfig-nommu" 1013endif 1014 1015config PJ4B_ERRATA_4742 1016 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1017 depends on CPU_PJ4B && MACH_ARMADA_370 1018 default y 1019 help 1020 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1021 Event (WFE) IDLE states, a specific timing sensitivity exists between 1022 the retiring WFI/WFE instructions and the newly issued subsequent 1023 instructions. This sensitivity can result in a CPU hang scenario. 1024 Workaround: 1025 The software must insert either a Data Synchronization Barrier (DSB) 1026 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1027 instruction 1028 1029config ARM_ERRATA_326103 1030 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1031 depends on CPU_V6 1032 help 1033 Executing a SWP instruction to read-only memory does not set bit 11 1034 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1035 treat the access as a read, preventing a COW from occurring and 1036 causing the faulting task to livelock. 1037 1038config ARM_ERRATA_411920 1039 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1040 depends on CPU_V6 || CPU_V6K 1041 help 1042 Invalidation of the Instruction Cache operation can 1043 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1044 It does not affect the MPCore. This option enables the ARM Ltd. 1045 recommended workaround. 1046 1047config ARM_ERRATA_430973 1048 bool "ARM errata: Stale prediction on replaced interworking branch" 1049 depends on CPU_V7 1050 help 1051 This option enables the workaround for the 430973 Cortex-A8 1052 r1p* erratum. If a code sequence containing an ARM/Thumb 1053 interworking branch is replaced with another code sequence at the 1054 same virtual address, whether due to self-modifying code or virtual 1055 to physical address re-mapping, Cortex-A8 does not recover from the 1056 stale interworking branch prediction. This results in Cortex-A8 1057 executing the new code sequence in the incorrect ARM or Thumb state. 1058 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1059 and also flushes the branch target cache at every context switch. 1060 Note that setting specific bits in the ACTLR register may not be 1061 available in non-secure mode. 1062 1063config ARM_ERRATA_458693 1064 bool "ARM errata: Processor deadlock when a false hazard is created" 1065 depends on CPU_V7 1066 depends on !ARCH_MULTIPLATFORM 1067 help 1068 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1069 erratum. For very specific sequences of memory operations, it is 1070 possible for a hazard condition intended for a cache line to instead 1071 be incorrectly associated with a different cache line. This false 1072 hazard might then cause a processor deadlock. The workaround enables 1073 the L1 caching of the NEON accesses and disables the PLD instruction 1074 in the ACTLR register. Note that setting specific bits in the ACTLR 1075 register may not be available in non-secure mode. 1076 1077config ARM_ERRATA_460075 1078 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1079 depends on CPU_V7 1080 depends on !ARCH_MULTIPLATFORM 1081 help 1082 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1083 erratum. Any asynchronous access to the L2 cache may encounter a 1084 situation in which recent store transactions to the L2 cache are lost 1085 and overwritten with stale memory contents from external memory. The 1086 workaround disables the write-allocate mode for the L2 cache via the 1087 ACTLR register. Note that setting specific bits in the ACTLR register 1088 may not be available in non-secure mode. 1089 1090config ARM_ERRATA_742230 1091 bool "ARM errata: DMB operation may be faulty" 1092 depends on CPU_V7 && SMP 1093 depends on !ARCH_MULTIPLATFORM 1094 help 1095 This option enables the workaround for the 742230 Cortex-A9 1096 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1097 between two write operations may not ensure the correct visibility 1098 ordering of the two writes. This workaround sets a specific bit in 1099 the diagnostic register of the Cortex-A9 which causes the DMB 1100 instruction to behave as a DSB, ensuring the correct behaviour of 1101 the two writes. 1102 1103config ARM_ERRATA_742231 1104 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1105 depends on CPU_V7 && SMP 1106 depends on !ARCH_MULTIPLATFORM 1107 help 1108 This option enables the workaround for the 742231 Cortex-A9 1109 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1110 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1111 accessing some data located in the same cache line, may get corrupted 1112 data due to bad handling of the address hazard when the line gets 1113 replaced from one of the CPUs at the same time as another CPU is 1114 accessing it. This workaround sets specific bits in the diagnostic 1115 register of the Cortex-A9 which reduces the linefill issuing 1116 capabilities of the processor. 1117 1118config ARM_ERRATA_643719 1119 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1120 depends on CPU_V7 && SMP 1121 default y 1122 help 1123 This option enables the workaround for the 643719 Cortex-A9 (prior to 1124 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1125 register returns zero when it should return one. The workaround 1126 corrects this value, ensuring cache maintenance operations which use 1127 it behave as intended and avoiding data corruption. 1128 1129config ARM_ERRATA_720789 1130 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1131 depends on CPU_V7 1132 help 1133 This option enables the workaround for the 720789 Cortex-A9 (prior to 1134 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1135 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1136 As a consequence of this erratum, some TLB entries which should be 1137 invalidated are not, resulting in an incoherency in the system page 1138 tables. The workaround changes the TLB flushing routines to invalidate 1139 entries regardless of the ASID. 1140 1141config ARM_ERRATA_743622 1142 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1143 depends on CPU_V7 1144 depends on !ARCH_MULTIPLATFORM 1145 help 1146 This option enables the workaround for the 743622 Cortex-A9 1147 (r2p*) erratum. Under very rare conditions, a faulty 1148 optimisation in the Cortex-A9 Store Buffer may lead to data 1149 corruption. This workaround sets a specific bit in the diagnostic 1150 register of the Cortex-A9 which disables the Store Buffer 1151 optimisation, preventing the defect from occurring. This has no 1152 visible impact on the overall performance or power consumption of the 1153 processor. 1154 1155config ARM_ERRATA_751472 1156 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1157 depends on CPU_V7 1158 depends on !ARCH_MULTIPLATFORM 1159 help 1160 This option enables the workaround for the 751472 Cortex-A9 (prior 1161 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1162 completion of a following broadcasted operation if the second 1163 operation is received by a CPU before the ICIALLUIS has completed, 1164 potentially leading to corrupted entries in the cache or TLB. 1165 1166config ARM_ERRATA_754322 1167 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1168 depends on CPU_V7 1169 help 1170 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1171 r3p*) erratum. A speculative memory access may cause a page table walk 1172 which starts prior to an ASID switch but completes afterwards. This 1173 can populate the micro-TLB with a stale entry which may be hit with 1174 the new ASID. This workaround places two dsb instructions in the mm 1175 switching code so that no page table walks can cross the ASID switch. 1176 1177config ARM_ERRATA_754327 1178 bool "ARM errata: no automatic Store Buffer drain" 1179 depends on CPU_V7 && SMP 1180 help 1181 This option enables the workaround for the 754327 Cortex-A9 (prior to 1182 r2p0) erratum. The Store Buffer does not have any automatic draining 1183 mechanism and therefore a livelock may occur if an external agent 1184 continuously polls a memory location waiting to observe an update. 1185 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1186 written polling loops from denying visibility of updates to memory. 1187 1188config ARM_ERRATA_364296 1189 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1190 depends on CPU_V6 1191 help 1192 This options enables the workaround for the 364296 ARM1136 1193 r0p2 erratum (possible cache data corruption with 1194 hit-under-miss enabled). It sets the undocumented bit 31 in 1195 the auxiliary control register and the FI bit in the control 1196 register, thus disabling hit-under-miss without putting the 1197 processor into full low interrupt latency mode. ARM11MPCore 1198 is not affected. 1199 1200config ARM_ERRATA_764369 1201 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1202 depends on CPU_V7 && SMP 1203 help 1204 This option enables the workaround for erratum 764369 1205 affecting Cortex-A9 MPCore with two or more processors (all 1206 current revisions). Under certain timing circumstances, a data 1207 cache line maintenance operation by MVA targeting an Inner 1208 Shareable memory region may fail to proceed up to either the 1209 Point of Coherency or to the Point of Unification of the 1210 system. This workaround adds a DSB instruction before the 1211 relevant cache maintenance functions and sets a specific bit 1212 in the diagnostic control register of the SCU. 1213 1214config ARM_ERRATA_775420 1215 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1216 depends on CPU_V7 1217 help 1218 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1219 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1220 operation aborts with MMU exception, it might cause the processor 1221 to deadlock. This workaround puts DSB before executing ISB if 1222 an abort may occur on cache maintenance. 1223 1224config ARM_ERRATA_798181 1225 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1226 depends on CPU_V7 && SMP 1227 help 1228 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1229 adequately shooting down all use of the old entries. This 1230 option enables the Linux kernel workaround for this erratum 1231 which sends an IPI to the CPUs that are running the same ASID 1232 as the one being invalidated. 1233 1234config ARM_ERRATA_773022 1235 bool "ARM errata: incorrect instructions may be executed from loop buffer" 1236 depends on CPU_V7 1237 help 1238 This option enables the workaround for the 773022 Cortex-A15 1239 (up to r0p4) erratum. In certain rare sequences of code, the 1240 loop buffer may deliver incorrect instructions. This 1241 workaround disables the loop buffer to avoid the erratum. 1242 1243endmenu 1244 1245source "arch/arm/common/Kconfig" 1246 1247menu "Bus support" 1248 1249config ISA 1250 bool 1251 help 1252 Find out whether you have ISA slots on your motherboard. ISA is the 1253 name of a bus system, i.e. the way the CPU talks to the other stuff 1254 inside your box. Other bus systems are PCI, EISA, MicroChannel 1255 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1256 newer boards don't support it. If you have ISA, say Y, otherwise N. 1257 1258# Select ISA DMA controller support 1259config ISA_DMA 1260 bool 1261 select ISA_DMA_API 1262 1263# Select ISA DMA interface 1264config ISA_DMA_API 1265 bool 1266 1267config PCI 1268 bool "PCI support" if MIGHT_HAVE_PCI 1269 help 1270 Find out whether you have a PCI motherboard. PCI is the name of a 1271 bus system, i.e. the way the CPU talks to the other stuff inside 1272 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1273 VESA. If you have PCI, say Y, otherwise N. 1274 1275config PCI_DOMAINS 1276 bool 1277 depends on PCI 1278 1279config PCI_DOMAINS_GENERIC 1280 def_bool PCI_DOMAINS 1281 1282config PCI_NANOENGINE 1283 bool "BSE nanoEngine PCI support" 1284 depends on SA1100_NANOENGINE 1285 help 1286 Enable PCI on the BSE nanoEngine board. 1287 1288config PCI_SYSCALL 1289 def_bool PCI 1290 1291config PCI_HOST_ITE8152 1292 bool 1293 depends on PCI && MACH_ARMCORE 1294 default y 1295 select DMABOUNCE 1296 1297source "drivers/pci/Kconfig" 1298source "drivers/pci/pcie/Kconfig" 1299 1300source "drivers/pcmcia/Kconfig" 1301 1302endmenu 1303 1304menu "Kernel Features" 1305 1306config HAVE_SMP 1307 bool 1308 help 1309 This option should be selected by machines which have an SMP- 1310 capable CPU. 1311 1312 The only effect of this option is to make the SMP-related 1313 options available to the user for configuration. 1314 1315config SMP 1316 bool "Symmetric Multi-Processing" 1317 depends on CPU_V6K || CPU_V7 1318 depends on GENERIC_CLOCKEVENTS 1319 depends on HAVE_SMP 1320 depends on MMU || ARM_MPU 1321 select IRQ_WORK 1322 help 1323 This enables support for systems with more than one CPU. If you have 1324 a system with only one CPU, say N. If you have a system with more 1325 than one CPU, say Y. 1326 1327 If you say N here, the kernel will run on uni- and multiprocessor 1328 machines, but will use only one CPU of a multiprocessor machine. If 1329 you say Y here, the kernel will run on many, but not all, 1330 uniprocessor machines. On a uniprocessor machine, the kernel 1331 will run faster if you say N here. 1332 1333 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1334 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1335 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1336 1337 If you don't know what to do here, say N. 1338 1339config SMP_ON_UP 1340 bool "Allow booting SMP kernel on uniprocessor systems" 1341 depends on SMP && !XIP_KERNEL && MMU 1342 default y 1343 help 1344 SMP kernels contain instructions which fail on non-SMP processors. 1345 Enabling this option allows the kernel to modify itself to make 1346 these instructions safe. Disabling it allows about 1K of space 1347 savings. 1348 1349 If you don't know what to do here, say Y. 1350 1351config ARM_CPU_TOPOLOGY 1352 bool "Support cpu topology definition" 1353 depends on SMP && CPU_V7 1354 default y 1355 help 1356 Support ARM cpu topology definition. The MPIDR register defines 1357 affinity between processors which is then used to describe the cpu 1358 topology of an ARM System. 1359 1360config SCHED_MC 1361 bool "Multi-core scheduler support" 1362 depends on ARM_CPU_TOPOLOGY 1363 help 1364 Multi-core scheduler support improves the CPU scheduler's decision 1365 making when dealing with multi-core CPU chips at a cost of slightly 1366 increased overhead in some places. If unsure say N here. 1367 1368config SCHED_SMT 1369 bool "SMT scheduler support" 1370 depends on ARM_CPU_TOPOLOGY 1371 help 1372 Improves the CPU scheduler's decision making when dealing with 1373 MultiThreading at a cost of slightly increased overhead in some 1374 places. If unsure say N here. 1375 1376config HAVE_ARM_SCU 1377 bool 1378 help 1379 This option enables support for the ARM system coherency unit 1380 1381config HAVE_ARM_ARCH_TIMER 1382 bool "Architected timer support" 1383 depends on CPU_V7 1384 select ARM_ARCH_TIMER 1385 select GENERIC_CLOCKEVENTS 1386 help 1387 This option enables support for the ARM architected timer 1388 1389config HAVE_ARM_TWD 1390 bool 1391 depends on SMP 1392 select CLKSRC_OF if OF 1393 help 1394 This options enables support for the ARM timer and watchdog unit 1395 1396config MCPM 1397 bool "Multi-Cluster Power Management" 1398 depends on CPU_V7 && SMP 1399 help 1400 This option provides the common power management infrastructure 1401 for (multi-)cluster based systems, such as big.LITTLE based 1402 systems. 1403 1404config MCPM_QUAD_CLUSTER 1405 bool 1406 depends on MCPM 1407 help 1408 To avoid wasting resources unnecessarily, MCPM only supports up 1409 to 2 clusters by default. 1410 Platforms with 3 or 4 clusters that use MCPM must select this 1411 option to allow the additional clusters to be managed. 1412 1413config BIG_LITTLE 1414 bool "big.LITTLE support (Experimental)" 1415 depends on CPU_V7 && SMP 1416 select MCPM 1417 help 1418 This option enables support selections for the big.LITTLE 1419 system architecture. 1420 1421config BL_SWITCHER 1422 bool "big.LITTLE switcher support" 1423 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU 1424 select ARM_CPU_SUSPEND 1425 select CPU_PM 1426 help 1427 The big.LITTLE "switcher" provides the core functionality to 1428 transparently handle transition between a cluster of A15's 1429 and a cluster of A7's in a big.LITTLE system. 1430 1431config BL_SWITCHER_DUMMY_IF 1432 tristate "Simple big.LITTLE switcher user interface" 1433 depends on BL_SWITCHER && DEBUG_KERNEL 1434 help 1435 This is a simple and dummy char dev interface to control 1436 the big.LITTLE switcher core code. It is meant for 1437 debugging purposes only. 1438 1439choice 1440 prompt "Memory split" 1441 depends on MMU 1442 default VMSPLIT_3G 1443 help 1444 Select the desired split between kernel and user memory. 1445 1446 If you are not absolutely sure what you are doing, leave this 1447 option alone! 1448 1449 config VMSPLIT_3G 1450 bool "3G/1G user/kernel split" 1451 config VMSPLIT_2G 1452 bool "2G/2G user/kernel split" 1453 config VMSPLIT_1G 1454 bool "1G/3G user/kernel split" 1455endchoice 1456 1457config PAGE_OFFSET 1458 hex 1459 default PHYS_OFFSET if !MMU 1460 default 0x40000000 if VMSPLIT_1G 1461 default 0x80000000 if VMSPLIT_2G 1462 default 0xC0000000 1463 1464config NR_CPUS 1465 int "Maximum number of CPUs (2-32)" 1466 range 2 32 1467 depends on SMP 1468 default "4" 1469 1470config HOTPLUG_CPU 1471 bool "Support for hot-pluggable CPUs" 1472 depends on SMP 1473 help 1474 Say Y here to experiment with turning CPUs off and on. CPUs 1475 can be controlled through /sys/devices/system/cpu. 1476 1477config ARM_PSCI 1478 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1479 depends on CPU_V7 1480 select ARM_PSCI_FW 1481 help 1482 Say Y here if you want Linux to communicate with system firmware 1483 implementing the PSCI specification for CPU-centric power 1484 management operations described in ARM document number ARM DEN 1485 0022A ("Power State Coordination Interface System Software on 1486 ARM processors"). 1487 1488# The GPIO number here must be sorted by descending number. In case of 1489# a multiplatform kernel, we just want the highest value required by the 1490# selected platforms. 1491config ARCH_NR_GPIO 1492 int 1493 default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \ 1494 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 128 if SOC_AT91RM9200 1515 default 0 1516 1517choice 1518 depends on HZ_FIXED = 0 1519 prompt "Timer frequency" 1520 1521config HZ_100 1522 bool "100 Hz" 1523 1524config HZ_200 1525 bool "200 Hz" 1526 1527config HZ_250 1528 bool "250 Hz" 1529 1530config HZ_300 1531 bool "300 Hz" 1532 1533config HZ_500 1534 bool "500 Hz" 1535 1536config HZ_1000 1537 bool "1000 Hz" 1538 1539endchoice 1540 1541config HZ 1542 int 1543 default HZ_FIXED if HZ_FIXED != 0 1544 default 100 if HZ_100 1545 default 200 if HZ_200 1546 default 250 if HZ_250 1547 default 300 if HZ_300 1548 default 500 if HZ_500 1549 default 1000 1550 1551config SCHED_HRTICK 1552 def_bool HIGH_RES_TIMERS 1553 1554config THUMB2_KERNEL 1555 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1556 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1557 default y if CPU_THUMBONLY 1558 select AEABI 1559 select ARM_ASM_UNIFIED 1560 select ARM_UNWIND 1561 help 1562 By enabling this option, the kernel will be compiled in 1563 Thumb-2 mode. A compiler/assembler that understand the unified 1564 ARM-Thumb syntax is needed. 1565 1566 If unsure, say N. 1567 1568config THUMB2_AVOID_R_ARM_THM_JUMP11 1569 bool "Work around buggy Thumb-2 short branch relocations in gas" 1570 depends on THUMB2_KERNEL && MODULES 1571 default y 1572 help 1573 Various binutils versions can resolve Thumb-2 branches to 1574 locally-defined, preemptible global symbols as short-range "b.n" 1575 branch instructions. 1576 1577 This is a problem, because there's no guarantee the final 1578 destination of the symbol, or any candidate locations for a 1579 trampoline, are within range of the branch. For this reason, the 1580 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1581 relocation in modules at all, and it makes little sense to add 1582 support. 1583 1584 The symptom is that the kernel fails with an "unsupported 1585 relocation" error when loading some modules. 1586 1587 Until fixed tools are available, passing 1588 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1589 code which hits this problem, at the cost of a bit of extra runtime 1590 stack usage in some cases. 1591 1592 The problem is described in more detail at: 1593 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1594 1595 Only Thumb-2 kernels are affected. 1596 1597 Unless you are sure your tools don't have this problem, say Y. 1598 1599config ARM_ASM_UNIFIED 1600 bool 1601 1602config AEABI 1603 bool "Use the ARM EABI to compile the kernel" 1604 help 1605 This option allows for the kernel to be compiled using the latest 1606 ARM ABI (aka EABI). This is only useful if you are using a user 1607 space environment that is also compiled with EABI. 1608 1609 Since there are major incompatibilities between the legacy ABI and 1610 EABI, especially with regard to structure member alignment, this 1611 option also changes the kernel syscall calling convention to 1612 disambiguate both ABIs and allow for backward compatibility support 1613 (selected with CONFIG_OABI_COMPAT). 1614 1615 To use this you need GCC version 4.0.0 or later. 1616 1617config OABI_COMPAT 1618 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1619 depends on AEABI && !THUMB2_KERNEL 1620 help 1621 This option preserves the old syscall interface along with the 1622 new (ARM EABI) one. It also provides a compatibility layer to 1623 intercept syscalls that have structure arguments which layout 1624 in memory differs between the legacy ABI and the new ARM EABI 1625 (only for non "thumb" binaries). This option adds a tiny 1626 overhead to all syscalls and produces a slightly larger kernel. 1627 1628 The seccomp filter system will not be available when this is 1629 selected, since there is no way yet to sensibly distinguish 1630 between calling conventions during filtering. 1631 1632 If you know you'll be using only pure EABI user space then you 1633 can say N here. If this option is not selected and you attempt 1634 to execute a legacy ABI binary then the result will be 1635 UNPREDICTABLE (in fact it can be predicted that it won't work 1636 at all). If in doubt say N. 1637 1638config ARCH_HAS_HOLES_MEMORYMODEL 1639 bool 1640 1641config ARCH_SPARSEMEM_ENABLE 1642 bool 1643 1644config ARCH_SPARSEMEM_DEFAULT 1645 def_bool ARCH_SPARSEMEM_ENABLE 1646 1647config ARCH_SELECT_MEMORY_MODEL 1648 def_bool ARCH_SPARSEMEM_ENABLE 1649 1650config HAVE_ARCH_PFN_VALID 1651 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1652 1653config HAVE_GENERIC_RCU_GUP 1654 def_bool y 1655 depends on ARM_LPAE 1656 1657config HIGHMEM 1658 bool "High Memory Support" 1659 depends on MMU 1660 help 1661 The address space of ARM processors is only 4 Gigabytes large 1662 and it has to accommodate user address space, kernel address 1663 space as well as some memory mapped IO. That means that, if you 1664 have a large amount of physical memory and/or IO, not all of the 1665 memory can be "permanently mapped" by the kernel. The physical 1666 memory that is not permanently mapped is called "high memory". 1667 1668 Depending on the selected kernel/user memory split, minimum 1669 vmalloc space and actual amount of RAM, you may not need this 1670 option which should result in a slightly faster kernel. 1671 1672 If unsure, say n. 1673 1674config HIGHPTE 1675 bool "Allocate 2nd-level pagetables from highmem" 1676 depends on HIGHMEM 1677 help 1678 The VM uses one page of physical memory for each page table. 1679 For systems with a lot of processes, this can use a lot of 1680 precious low memory, eventually leading to low memory being 1681 consumed by page tables. Setting this option will allow 1682 user-space 2nd level page tables to reside in high memory. 1683 1684config CPU_SW_DOMAIN_PAN 1685 bool "Enable use of CPU domains to implement privileged no-access" 1686 depends on MMU && !ARM_LPAE 1687 default y 1688 help 1689 Increase kernel security by ensuring that normal kernel accesses 1690 are unable to access userspace addresses. This can help prevent 1691 use-after-free bugs becoming an exploitable privilege escalation 1692 by ensuring that magic values (such as LIST_POISON) will always 1693 fault when dereferenced. 1694 1695 CPUs with low-vector mappings use a best-efforts implementation. 1696 Their lower 1MB needs to remain accessible for the vectors, but 1697 the remainder of userspace will become appropriately inaccessible. 1698 1699config HW_PERF_EVENTS 1700 def_bool y 1701 depends on ARM_PMU 1702 1703config SYS_SUPPORTS_HUGETLBFS 1704 def_bool y 1705 depends on ARM_LPAE 1706 1707config HAVE_ARCH_TRANSPARENT_HUGEPAGE 1708 def_bool y 1709 depends on ARM_LPAE 1710 1711config ARCH_WANT_GENERAL_HUGETLB 1712 def_bool y 1713 1714config ARM_MODULE_PLTS 1715 bool "Use PLTs to allow module memory to spill over into vmalloc area" 1716 depends on MODULES 1717 help 1718 Allocate PLTs when loading modules so that jumps and calls whose 1719 targets are too far away for their relative offsets to be encoded 1720 in the instructions themselves can be bounced via veneers in the 1721 module's PLT. This allows modules to be allocated in the generic 1722 vmalloc area after the dedicated module memory area has been 1723 exhausted. The modules will use slightly more memory, but after 1724 rounding up to page size, the actual memory footprint is usually 1725 the same. 1726 1727 Say y if you are getting out of memory errors while loading modules 1728 1729source "mm/Kconfig" 1730 1731config FORCE_MAX_ZONEORDER 1732 int "Maximum zone order" 1733 default "12" if SOC_AM33XX 1734 default "9" if SA1111 || ARCH_EFM32 1735 default "11" 1736 help 1737 The kernel memory allocator divides physically contiguous memory 1738 blocks into "zones", where each zone is a power of two number of 1739 pages. This option selects the largest power of two that the kernel 1740 keeps in the memory allocator. If you need to allocate very large 1741 blocks of physically contiguous memory, then you may need to 1742 increase this value. 1743 1744 This config option is actually maximum order plus one. For example, 1745 a value of 11 means that the largest free memory block is 2^10 pages. 1746 1747config ALIGNMENT_TRAP 1748 bool 1749 depends on CPU_CP15_MMU 1750 default y if !ARCH_EBSA110 1751 select HAVE_PROC_CPU if PROC_FS 1752 help 1753 ARM processors cannot fetch/store information which is not 1754 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1755 address divisible by 4. On 32-bit ARM processors, these non-aligned 1756 fetch/store instructions will be emulated in software if you say 1757 here, which has a severe performance impact. This is necessary for 1758 correct operation of some network protocols. With an IP-only 1759 configuration it is safe to say N, otherwise say Y. 1760 1761config UACCESS_WITH_MEMCPY 1762 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1763 depends on MMU 1764 default y if CPU_FEROCEON 1765 help 1766 Implement faster copy_to_user and clear_user methods for CPU 1767 cores where a 8-word STM instruction give significantly higher 1768 memory write throughput than a sequence of individual 32bit stores. 1769 1770 A possible side effect is a slight increase in scheduling latency 1771 between threads sharing the same address space if they invoke 1772 such copy operations with large buffers. 1773 1774 However, if the CPU data cache is using a write-allocate mode, 1775 this option is unlikely to provide any performance gain. 1776 1777config SECCOMP 1778 bool 1779 prompt "Enable seccomp to safely compute untrusted bytecode" 1780 ---help--- 1781 This kernel feature is useful for number crunching applications 1782 that may need to compute untrusted bytecode during their 1783 execution. By using pipes or other transports made available to 1784 the process as file descriptors supporting the read/write 1785 syscalls, it's possible to isolate those applications in 1786 their own address space using seccomp. Once seccomp is 1787 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1788 and the task is only allowed to execute a few safe syscalls 1789 defined by each seccomp mode. 1790 1791config SWIOTLB 1792 def_bool y 1793 1794config IOMMU_HELPER 1795 def_bool SWIOTLB 1796 1797config XEN_DOM0 1798 def_bool y 1799 depends on XEN 1800 1801config XEN 1802 bool "Xen guest support on ARM" 1803 depends on ARM && AEABI && OF 1804 depends on CPU_V7 && !CPU_V6 1805 depends on !GENERIC_ATOMIC64 1806 depends on MMU 1807 select ARCH_DMA_ADDR_T_64BIT 1808 select ARM_PSCI 1809 select SWIOTLB_XEN 1810 help 1811 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1812 1813endmenu 1814 1815menu "Boot options" 1816 1817config USE_OF 1818 bool "Flattened Device Tree support" 1819 select IRQ_DOMAIN 1820 select OF 1821 select OF_EARLY_FLATTREE 1822 select OF_RESERVED_MEM 1823 help 1824 Include support for flattened device tree machine descriptions. 1825 1826config ATAGS 1827 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1828 default y 1829 help 1830 This is the traditional way of passing data to the kernel at boot 1831 time. If you are solely relying on the flattened device tree (or 1832 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1833 to remove ATAGS support from your kernel binary. If unsure, 1834 leave this to y. 1835 1836config DEPRECATED_PARAM_STRUCT 1837 bool "Provide old way to pass kernel parameters" 1838 depends on ATAGS 1839 help 1840 This was deprecated in 2001 and announced to live on for 5 years. 1841 Some old boot loaders still use this way. 1842 1843# Compressed boot loader in ROM. Yes, we really want to ask about 1844# TEXT and BSS so we preserve their values in the config files. 1845config ZBOOT_ROM_TEXT 1846 hex "Compressed ROM boot loader base address" 1847 default "0" 1848 help 1849 The physical address at which the ROM-able zImage is to be 1850 placed in the target. Platforms which normally make use of 1851 ROM-able zImage formats normally set this to a suitable 1852 value in their defconfig file. 1853 1854 If ZBOOT_ROM is not enabled, this has no effect. 1855 1856config ZBOOT_ROM_BSS 1857 hex "Compressed ROM boot loader BSS address" 1858 default "0" 1859 help 1860 The base address of an area of read/write memory in the target 1861 for the ROM-able zImage which must be available while the 1862 decompressor is running. It must be large enough to hold the 1863 entire decompressed kernel plus an additional 128 KiB. 1864 Platforms which normally make use of ROM-able zImage formats 1865 normally set this to a suitable value in their defconfig file. 1866 1867 If ZBOOT_ROM is not enabled, this has no effect. 1868 1869config ZBOOT_ROM 1870 bool "Compressed boot loader in ROM/flash" 1871 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1872 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1873 help 1874 Say Y here if you intend to execute your compressed kernel image 1875 (zImage) directly from ROM or flash. If unsure, say N. 1876 1877config ARM_APPENDED_DTB 1878 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1879 depends on OF 1880 help 1881 With this option, the boot code will look for a device tree binary 1882 (DTB) appended to zImage 1883 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1884 1885 This is meant as a backward compatibility convenience for those 1886 systems with a bootloader that can't be upgraded to accommodate 1887 the documented boot protocol using a device tree. 1888 1889 Beware that there is very little in terms of protection against 1890 this option being confused by leftover garbage in memory that might 1891 look like a DTB header after a reboot if no actual DTB is appended 1892 to zImage. Do not leave this option active in a production kernel 1893 if you don't intend to always append a DTB. Proper passing of the 1894 location into r2 of a bootloader provided DTB is always preferable 1895 to this option. 1896 1897config ARM_ATAG_DTB_COMPAT 1898 bool "Supplement the appended DTB with traditional ATAG information" 1899 depends on ARM_APPENDED_DTB 1900 help 1901 Some old bootloaders can't be updated to a DTB capable one, yet 1902 they provide ATAGs with memory configuration, the ramdisk address, 1903 the kernel cmdline string, etc. Such information is dynamically 1904 provided by the bootloader and can't always be stored in a static 1905 DTB. To allow a device tree enabled kernel to be used with such 1906 bootloaders, this option allows zImage to extract the information 1907 from the ATAG list and store it at run time into the appended DTB. 1908 1909choice 1910 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1911 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1912 1913config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1914 bool "Use bootloader kernel arguments if available" 1915 help 1916 Uses the command-line options passed by the boot loader instead of 1917 the device tree bootargs property. If the boot loader doesn't provide 1918 any, the device tree bootargs property will be used. 1919 1920config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1921 bool "Extend with bootloader kernel arguments" 1922 help 1923 The command-line arguments provided by the boot loader will be 1924 appended to the the device tree bootargs property. 1925 1926endchoice 1927 1928config CMDLINE 1929 string "Default kernel command string" 1930 default "" 1931 help 1932 On some architectures (EBSA110 and CATS), there is currently no way 1933 for the boot loader to pass arguments to the kernel. For these 1934 architectures, you should supply some command-line options at build 1935 time by entering them here. As a minimum, you should specify the 1936 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1937 1938choice 1939 prompt "Kernel command line type" if CMDLINE != "" 1940 default CMDLINE_FROM_BOOTLOADER 1941 depends on ATAGS 1942 1943config CMDLINE_FROM_BOOTLOADER 1944 bool "Use bootloader kernel arguments if available" 1945 help 1946 Uses the command-line options passed by the boot loader. If 1947 the boot loader doesn't provide any, the default kernel command 1948 string provided in CMDLINE will be used. 1949 1950config CMDLINE_EXTEND 1951 bool "Extend bootloader kernel arguments" 1952 help 1953 The command-line arguments provided by the boot loader will be 1954 appended to the default kernel command string. 1955 1956config CMDLINE_FORCE 1957 bool "Always use the default kernel command string" 1958 help 1959 Always use the default kernel command string, even if the boot 1960 loader passes other arguments to the kernel. 1961 This is useful if you cannot or don't want to change the 1962 command-line options your boot loader passes to the kernel. 1963endchoice 1964 1965config XIP_KERNEL 1966 bool "Kernel Execute-In-Place from ROM" 1967 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1968 help 1969 Execute-In-Place allows the kernel to run from non-volatile storage 1970 directly addressable by the CPU, such as NOR flash. This saves RAM 1971 space since the text section of the kernel is not loaded from flash 1972 to RAM. Read-write sections, such as the data section and stack, 1973 are still copied to RAM. The XIP kernel is not compressed since 1974 it has to run directly from flash, so it will take more space to 1975 store it. The flash address used to link the kernel object files, 1976 and for storing it, is configuration dependent. Therefore, if you 1977 say Y here, you must know the proper physical address where to 1978 store the kernel image depending on your own flash memory usage. 1979 1980 Also note that the make target becomes "make xipImage" rather than 1981 "make zImage" or "make Image". The final kernel binary to put in 1982 ROM memory will be arch/arm/boot/xipImage. 1983 1984 If unsure, say N. 1985 1986config XIP_PHYS_ADDR 1987 hex "XIP Kernel Physical Location" 1988 depends on XIP_KERNEL 1989 default "0x00080000" 1990 help 1991 This is the physical address in your flash memory the kernel will 1992 be linked for and stored to. This address is dependent on your 1993 own flash usage. 1994 1995config KEXEC 1996 bool "Kexec system call (EXPERIMENTAL)" 1997 depends on (!SMP || PM_SLEEP_SMP) 1998 depends on !CPU_V7M 1999 select KEXEC_CORE 2000 help 2001 kexec is a system call that implements the ability to shutdown your 2002 current kernel, and to start another kernel. It is like a reboot 2003 but it is independent of the system firmware. And like a reboot 2004 you can start any kernel with it, not just Linux. 2005 2006 It is an ongoing process to be certain the hardware in a machine 2007 is properly shutdown, so do not be surprised if this code does not 2008 initially work for you. 2009 2010config ATAGS_PROC 2011 bool "Export atags in procfs" 2012 depends on ATAGS && KEXEC 2013 default y 2014 help 2015 Should the atags used to boot the kernel be exported in an "atags" 2016 file in procfs. Useful with kexec. 2017 2018config CRASH_DUMP 2019 bool "Build kdump crash kernel (EXPERIMENTAL)" 2020 help 2021 Generate crash dump after being started by kexec. This should 2022 be normally only set in special crash dump kernels which are 2023 loaded in the main kernel with kexec-tools into a specially 2024 reserved region and then later executed after a crash by 2025 kdump/kexec. The crash dump kernel must be compiled to a 2026 memory address not used by the main kernel 2027 2028 For more details see Documentation/kdump/kdump.txt 2029 2030config AUTO_ZRELADDR 2031 bool "Auto calculation of the decompressed kernel image address" 2032 help 2033 ZRELADDR is the physical address where the decompressed kernel 2034 image will be placed. If AUTO_ZRELADDR is selected, the address 2035 will be determined at run-time by masking the current IP with 2036 0xf8000000. This assumes the zImage being placed in the first 128MB 2037 from start of memory. 2038 2039endmenu 2040 2041menu "CPU Power Management" 2042 2043source "drivers/cpufreq/Kconfig" 2044 2045source "drivers/cpuidle/Kconfig" 2046 2047endmenu 2048 2049menu "Floating point emulation" 2050 2051comment "At least one emulation must be selected" 2052 2053config FPE_NWFPE 2054 bool "NWFPE math emulation" 2055 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2056 ---help--- 2057 Say Y to include the NWFPE floating point emulator in the kernel. 2058 This is necessary to run most binaries. Linux does not currently 2059 support floating point hardware so you need to say Y here even if 2060 your machine has an FPA or floating point co-processor podule. 2061 2062 You may say N here if you are going to load the Acorn FPEmulator 2063 early in the bootup. 2064 2065config FPE_NWFPE_XP 2066 bool "Support extended precision" 2067 depends on FPE_NWFPE 2068 help 2069 Say Y to include 80-bit support in the kernel floating-point 2070 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2071 Note that gcc does not generate 80-bit operations by default, 2072 so in most cases this option only enlarges the size of the 2073 floating point emulator without any good reason. 2074 2075 You almost surely want to say N here. 2076 2077config FPE_FASTFPE 2078 bool "FastFPE math emulation (EXPERIMENTAL)" 2079 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2080 ---help--- 2081 Say Y here to include the FAST floating point emulator in the kernel. 2082 This is an experimental much faster emulator which now also has full 2083 precision for the mantissa. It does not support any exceptions. 2084 It is very simple, and approximately 3-6 times faster than NWFPE. 2085 2086 It should be sufficient for most programs. It may be not suitable 2087 for scientific calculations, but you have to check this for yourself. 2088 If you do not feel you need a faster FP emulation you should better 2089 choose NWFPE. 2090 2091config VFP 2092 bool "VFP-format floating point maths" 2093 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2094 help 2095 Say Y to include VFP support code in the kernel. This is needed 2096 if your hardware includes a VFP unit. 2097 2098 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2099 release notes and additional status information. 2100 2101 Say N if your target does not have VFP hardware. 2102 2103config VFPv3 2104 bool 2105 depends on VFP 2106 default y if CPU_V7 2107 2108config NEON 2109 bool "Advanced SIMD (NEON) Extension support" 2110 depends on VFPv3 && CPU_V7 2111 help 2112 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2113 Extension. 2114 2115config KERNEL_MODE_NEON 2116 bool "Support for NEON in kernel mode" 2117 depends on NEON && AEABI 2118 help 2119 Say Y to include support for NEON in kernel mode. 2120 2121endmenu 2122 2123menu "Userspace binary formats" 2124 2125source "fs/Kconfig.binfmt" 2126 2127endmenu 2128 2129menu "Power management options" 2130 2131source "kernel/power/Kconfig" 2132 2133config ARCH_SUSPEND_POSSIBLE 2134 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 2135 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2136 def_bool y 2137 2138config ARM_CPU_SUSPEND 2139 def_bool PM_SLEEP 2140 2141config ARCH_HIBERNATION_POSSIBLE 2142 bool 2143 depends on MMU 2144 default y if ARCH_SUSPEND_POSSIBLE 2145 2146endmenu 2147 2148source "net/Kconfig" 2149 2150source "drivers/Kconfig" 2151 2152source "drivers/firmware/Kconfig" 2153 2154source "fs/Kconfig" 2155 2156source "arch/arm/Kconfig.debug" 2157 2158source "security/Kconfig" 2159 2160source "crypto/Kconfig" 2161if CRYPTO 2162source "arch/arm/crypto/Kconfig" 2163endif 2164 2165source "lib/Kconfig" 2166 2167source "arch/arm/kvm/Kconfig" 2168