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 MULTI_IRQ_HANDLER 514 select MVEBU_MBUS 515 select PINCTRL 516 select PINCTRL_DOVE 517 select PLAT_ORION_LEGACY 518 select SPARSE_IRQ 519 help 520 Support for the Marvell Dove SoC 88AP510 521 522config ARCH_ORION5X 523 bool "Marvell Orion" 524 depends on MMU 525 select ARCH_REQUIRE_GPIOLIB 526 select CPU_FEROCEON 527 select GENERIC_CLOCKEVENTS 528 select MVEBU_MBUS 529 select MULTI_IRQ_HANDLER 530 select PCI 531 select PLAT_ORION_LEGACY 532 select MULTI_IRQ_HANDLER 533 select SPARSE_IRQ 534 help 535 Support for the following Marvell Orion 5x series SoCs: 536 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 537 Orion-2 (5281), Orion-1-90 (6183). 538 539config ARCH_MMP 540 bool "Marvell PXA168/910/MMP2" 541 depends on MMU 542 select ARCH_REQUIRE_GPIOLIB 543 select CLKDEV_LOOKUP 544 select GENERIC_ALLOCATOR 545 select GENERIC_CLOCKEVENTS 546 select GPIO_PXA 547 select IRQ_DOMAIN 548 select MULTI_IRQ_HANDLER 549 select PINCTRL 550 select PLAT_PXA 551 select SPARSE_IRQ 552 help 553 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 554 555config ARCH_KS8695 556 bool "Micrel/Kendin KS8695" 557 select ARCH_REQUIRE_GPIOLIB 558 select CLKSRC_MMIO 559 select CPU_ARM922T 560 select GENERIC_CLOCKEVENTS 561 select NEED_MACH_MEMORY_H 562 help 563 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 564 System-on-Chip devices. 565 566config ARCH_W90X900 567 bool "Nuvoton W90X900 CPU" 568 select ARCH_REQUIRE_GPIOLIB 569 select CLKDEV_LOOKUP 570 select CLKSRC_MMIO 571 select CPU_ARM926T 572 select GENERIC_CLOCKEVENTS 573 help 574 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 575 At present, the w90x900 has been renamed nuc900, regarding 576 the ARM series product line, you can login the following 577 link address to know more. 578 579 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 580 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 581 582config ARCH_LPC32XX 583 bool "NXP LPC32XX" 584 select ARCH_REQUIRE_GPIOLIB 585 select ARM_AMBA 586 select CLKDEV_LOOKUP 587 select CLKSRC_MMIO 588 select CPU_ARM926T 589 select GENERIC_CLOCKEVENTS 590 select HAVE_IDE 591 select USE_OF 592 help 593 Support for the NXP LPC32XX family of processors 594 595config ARCH_PXA 596 bool "PXA2xx/PXA3xx-based" 597 depends on MMU 598 select ARCH_MTD_XIP 599 select ARCH_REQUIRE_GPIOLIB 600 select ARM_CPU_SUSPEND if PM 601 select AUTO_ZRELADDR 602 select COMMON_CLK 603 select CLKDEV_LOOKUP 604 select CLKSRC_MMIO 605 select CLKSRC_OF 606 select GENERIC_CLOCKEVENTS 607 select GPIO_PXA 608 select HAVE_IDE 609 select IRQ_DOMAIN 610 select MULTI_IRQ_HANDLER 611 select PLAT_PXA 612 select SPARSE_IRQ 613 help 614 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 615 616config ARCH_RPC 617 bool "RiscPC" 618 depends on MMU 619 select ARCH_ACORN 620 select ARCH_MAY_HAVE_PC_FDC 621 select ARCH_SPARSEMEM_ENABLE 622 select ARCH_USES_GETTIMEOFFSET 623 select CPU_SA110 624 select FIQ 625 select HAVE_IDE 626 select HAVE_PATA_PLATFORM 627 select ISA_DMA_API 628 select NEED_MACH_IO_H 629 select NEED_MACH_MEMORY_H 630 select NO_IOPORT_MAP 631 select VIRT_TO_BUS 632 help 633 On the Acorn Risc-PC, Linux can support the internal IDE disk and 634 CD-ROM interface, serial and parallel port, and the floppy drive. 635 636config ARCH_SA1100 637 bool "SA1100-based" 638 select ARCH_MTD_XIP 639 select ARCH_REQUIRE_GPIOLIB 640 select ARCH_SPARSEMEM_ENABLE 641 select CLKDEV_LOOKUP 642 select CLKSRC_MMIO 643 select CPU_FREQ 644 select CPU_SA1100 645 select GENERIC_CLOCKEVENTS 646 select HAVE_IDE 647 select IRQ_DOMAIN 648 select ISA 649 select MULTI_IRQ_HANDLER 650 select NEED_MACH_MEMORY_H 651 select SPARSE_IRQ 652 help 653 Support for StrongARM 11x0 based boards. 654 655config ARCH_S3C24XX 656 bool "Samsung S3C24XX SoCs" 657 select ARCH_REQUIRE_GPIOLIB 658 select ATAGS 659 select CLKDEV_LOOKUP 660 select CLKSRC_SAMSUNG_PWM 661 select GENERIC_CLOCKEVENTS 662 select GPIO_SAMSUNG 663 select HAVE_S3C2410_I2C if I2C 664 select HAVE_S3C2410_WATCHDOG if WATCHDOG 665 select HAVE_S3C_RTC if RTC_CLASS 666 select MULTI_IRQ_HANDLER 667 select NEED_MACH_IO_H 668 select SAMSUNG_ATAGS 669 help 670 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 671 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 672 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 673 Samsung SMDK2410 development board (and derivatives). 674 675config ARCH_S3C64XX 676 bool "Samsung S3C64XX" 677 select ARCH_REQUIRE_GPIOLIB 678 select ARM_AMBA 679 select ARM_VIC 680 select ATAGS 681 select CLKDEV_LOOKUP 682 select CLKSRC_SAMSUNG_PWM 683 select COMMON_CLK_SAMSUNG 684 select CPU_V6K 685 select GENERIC_CLOCKEVENTS 686 select GPIO_SAMSUNG 687 select HAVE_S3C2410_I2C if I2C 688 select HAVE_S3C2410_WATCHDOG if WATCHDOG 689 select HAVE_TCM 690 select NO_IOPORT_MAP 691 select PLAT_SAMSUNG 692 select PM_GENERIC_DOMAINS if PM 693 select S3C_DEV_NAND 694 select S3C_GPIO_TRACK 695 select SAMSUNG_ATAGS 696 select SAMSUNG_WAKEMASK 697 select SAMSUNG_WDT_RESET 698 help 699 Samsung S3C64XX series based systems 700 701config ARCH_DAVINCI 702 bool "TI DaVinci" 703 select ARCH_HAS_HOLES_MEMORYMODEL 704 select ARCH_REQUIRE_GPIOLIB 705 select CLKDEV_LOOKUP 706 select GENERIC_ALLOCATOR 707 select GENERIC_CLOCKEVENTS 708 select GENERIC_IRQ_CHIP 709 select HAVE_IDE 710 select USE_OF 711 select ZONE_DMA 712 help 713 Support for TI's DaVinci platform. 714 715config ARCH_OMAP1 716 bool "TI OMAP1" 717 depends on MMU 718 select ARCH_HAS_HOLES_MEMORYMODEL 719 select ARCH_OMAP 720 select ARCH_REQUIRE_GPIOLIB 721 select CLKDEV_LOOKUP 722 select CLKSRC_MMIO 723 select GENERIC_CLOCKEVENTS 724 select GENERIC_IRQ_CHIP 725 select HAVE_IDE 726 select IRQ_DOMAIN 727 select MULTI_IRQ_HANDLER 728 select NEED_MACH_IO_H if PCCARD 729 select NEED_MACH_MEMORY_H 730 select SPARSE_IRQ 731 help 732 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 733 734endchoice 735 736menu "Multiple platform selection" 737 depends on ARCH_MULTIPLATFORM 738 739comment "CPU Core family selection" 740 741config ARCH_MULTI_V4 742 bool "ARMv4 based platforms (FA526)" 743 depends on !ARCH_MULTI_V6_V7 744 select ARCH_MULTI_V4_V5 745 select CPU_FA526 746 747config ARCH_MULTI_V4T 748 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 749 depends on !ARCH_MULTI_V6_V7 750 select ARCH_MULTI_V4_V5 751 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 752 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 753 CPU_ARM925T || CPU_ARM940T) 754 755config ARCH_MULTI_V5 756 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 757 depends on !ARCH_MULTI_V6_V7 758 select ARCH_MULTI_V4_V5 759 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 760 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 761 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 762 763config ARCH_MULTI_V4_V5 764 bool 765 766config ARCH_MULTI_V6 767 bool "ARMv6 based platforms (ARM11)" 768 select ARCH_MULTI_V6_V7 769 select CPU_V6K 770 771config ARCH_MULTI_V7 772 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 773 default y 774 select ARCH_MULTI_V6_V7 775 select CPU_V7 776 select HAVE_SMP 777 778config ARCH_MULTI_V6_V7 779 bool 780 select MIGHT_HAVE_CACHE_L2X0 781 782config ARCH_MULTI_CPU_AUTO 783 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 784 select ARCH_MULTI_V5 785 786endmenu 787 788config ARCH_VIRT 789 bool "Dummy Virtual Machine" if ARCH_MULTI_V7 790 select ARM_AMBA 791 select ARM_GIC 792 select ARM_GIC_V3 793 select ARM_PSCI 794 select HAVE_ARM_ARCH_TIMER 795 796# 797# This is sorted alphabetically by mach-* pathname. However, plat-* 798# Kconfigs may be included either alphabetically (according to the 799# plat- suffix) or along side the corresponding mach-* source. 800# 801source "arch/arm/mach-mvebu/Kconfig" 802 803source "arch/arm/mach-alpine/Kconfig" 804 805source "arch/arm/mach-asm9260/Kconfig" 806 807source "arch/arm/mach-at91/Kconfig" 808 809source "arch/arm/mach-axxia/Kconfig" 810 811source "arch/arm/mach-bcm/Kconfig" 812 813source "arch/arm/mach-berlin/Kconfig" 814 815source "arch/arm/mach-clps711x/Kconfig" 816 817source "arch/arm/mach-cns3xxx/Kconfig" 818 819source "arch/arm/mach-davinci/Kconfig" 820 821source "arch/arm/mach-digicolor/Kconfig" 822 823source "arch/arm/mach-dove/Kconfig" 824 825source "arch/arm/mach-ep93xx/Kconfig" 826 827source "arch/arm/mach-footbridge/Kconfig" 828 829source "arch/arm/mach-gemini/Kconfig" 830 831source "arch/arm/mach-highbank/Kconfig" 832 833source "arch/arm/mach-hisi/Kconfig" 834 835source "arch/arm/mach-integrator/Kconfig" 836 837source "arch/arm/mach-iop32x/Kconfig" 838 839source "arch/arm/mach-iop33x/Kconfig" 840 841source "arch/arm/mach-iop13xx/Kconfig" 842 843source "arch/arm/mach-ixp4xx/Kconfig" 844 845source "arch/arm/mach-keystone/Kconfig" 846 847source "arch/arm/mach-ks8695/Kconfig" 848 849source "arch/arm/mach-meson/Kconfig" 850 851source "arch/arm/mach-moxart/Kconfig" 852 853source "arch/arm/mach-mv78xx0/Kconfig" 854 855source "arch/arm/mach-imx/Kconfig" 856 857source "arch/arm/mach-mediatek/Kconfig" 858 859source "arch/arm/mach-mxs/Kconfig" 860 861source "arch/arm/mach-netx/Kconfig" 862 863source "arch/arm/mach-nomadik/Kconfig" 864 865source "arch/arm/mach-nspire/Kconfig" 866 867source "arch/arm/plat-omap/Kconfig" 868 869source "arch/arm/mach-omap1/Kconfig" 870 871source "arch/arm/mach-omap2/Kconfig" 872 873source "arch/arm/mach-orion5x/Kconfig" 874 875source "arch/arm/mach-picoxcell/Kconfig" 876 877source "arch/arm/mach-pxa/Kconfig" 878source "arch/arm/plat-pxa/Kconfig" 879 880source "arch/arm/mach-mmp/Kconfig" 881 882source "arch/arm/mach-qcom/Kconfig" 883 884source "arch/arm/mach-realview/Kconfig" 885 886source "arch/arm/mach-rockchip/Kconfig" 887 888source "arch/arm/mach-sa1100/Kconfig" 889 890source "arch/arm/mach-socfpga/Kconfig" 891 892source "arch/arm/mach-spear/Kconfig" 893 894source "arch/arm/mach-sti/Kconfig" 895 896source "arch/arm/mach-s3c24xx/Kconfig" 897 898source "arch/arm/mach-s3c64xx/Kconfig" 899 900source "arch/arm/mach-s5pv210/Kconfig" 901 902source "arch/arm/mach-exynos/Kconfig" 903source "arch/arm/plat-samsung/Kconfig" 904 905source "arch/arm/mach-shmobile/Kconfig" 906 907source "arch/arm/mach-sunxi/Kconfig" 908 909source "arch/arm/mach-prima2/Kconfig" 910 911source "arch/arm/mach-tegra/Kconfig" 912 913source "arch/arm/mach-u300/Kconfig" 914 915source "arch/arm/mach-uniphier/Kconfig" 916 917source "arch/arm/mach-ux500/Kconfig" 918 919source "arch/arm/mach-versatile/Kconfig" 920 921source "arch/arm/mach-vexpress/Kconfig" 922source "arch/arm/plat-versatile/Kconfig" 923 924source "arch/arm/mach-vt8500/Kconfig" 925 926source "arch/arm/mach-w90x900/Kconfig" 927 928source "arch/arm/mach-zx/Kconfig" 929 930source "arch/arm/mach-zynq/Kconfig" 931 932# ARMv7-M architecture 933config ARCH_EFM32 934 bool "Energy Micro efm32" 935 depends on ARM_SINGLE_ARMV7M 936 select ARCH_REQUIRE_GPIOLIB 937 help 938 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko 939 processors. 940 941config ARCH_LPC18XX 942 bool "NXP LPC18xx/LPC43xx" 943 depends on ARM_SINGLE_ARMV7M 944 select ARCH_HAS_RESET_CONTROLLER 945 select ARM_AMBA 946 select CLKSRC_LPC32XX 947 select PINCTRL 948 help 949 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4 950 high performance microcontrollers. 951 952config ARCH_STM32 953 bool "STMicrolectronics STM32" 954 depends on ARM_SINGLE_ARMV7M 955 select ARCH_HAS_RESET_CONTROLLER 956 select ARMV7M_SYSTICK 957 select CLKSRC_STM32 958 select RESET_CONTROLLER 959 help 960 Support for STMicroelectronics STM32 processors. 961 962# Definitions to make life easier 963config ARCH_ACORN 964 bool 965 966config PLAT_IOP 967 bool 968 select GENERIC_CLOCKEVENTS 969 970config PLAT_ORION 971 bool 972 select CLKSRC_MMIO 973 select COMMON_CLK 974 select GENERIC_IRQ_CHIP 975 select IRQ_DOMAIN 976 977config PLAT_ORION_LEGACY 978 bool 979 select PLAT_ORION 980 981config PLAT_PXA 982 bool 983 984config PLAT_VERSATILE 985 bool 986 987source "arch/arm/firmware/Kconfig" 988 989source arch/arm/mm/Kconfig 990 991config IWMMXT 992 bool "Enable iWMMXt support" 993 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 994 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 995 help 996 Enable support for iWMMXt context switching at run time if 997 running on a CPU that supports it. 998 999config MULTI_IRQ_HANDLER 1000 bool 1001 help 1002 Allow each machine to specify it's own IRQ handler at run time. 1003 1004if !MMU 1005source "arch/arm/Kconfig-nommu" 1006endif 1007 1008config PJ4B_ERRATA_4742 1009 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1010 depends on CPU_PJ4B && MACH_ARMADA_370 1011 default y 1012 help 1013 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1014 Event (WFE) IDLE states, a specific timing sensitivity exists between 1015 the retiring WFI/WFE instructions and the newly issued subsequent 1016 instructions. This sensitivity can result in a CPU hang scenario. 1017 Workaround: 1018 The software must insert either a Data Synchronization Barrier (DSB) 1019 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1020 instruction 1021 1022config ARM_ERRATA_326103 1023 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1024 depends on CPU_V6 1025 help 1026 Executing a SWP instruction to read-only memory does not set bit 11 1027 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1028 treat the access as a read, preventing a COW from occurring and 1029 causing the faulting task to livelock. 1030 1031config ARM_ERRATA_411920 1032 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1033 depends on CPU_V6 || CPU_V6K 1034 help 1035 Invalidation of the Instruction Cache operation can 1036 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1037 It does not affect the MPCore. This option enables the ARM Ltd. 1038 recommended workaround. 1039 1040config ARM_ERRATA_430973 1041 bool "ARM errata: Stale prediction on replaced interworking branch" 1042 depends on CPU_V7 1043 help 1044 This option enables the workaround for the 430973 Cortex-A8 1045 r1p* erratum. If a code sequence containing an ARM/Thumb 1046 interworking branch is replaced with another code sequence at the 1047 same virtual address, whether due to self-modifying code or virtual 1048 to physical address re-mapping, Cortex-A8 does not recover from the 1049 stale interworking branch prediction. This results in Cortex-A8 1050 executing the new code sequence in the incorrect ARM or Thumb state. 1051 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1052 and also flushes the branch target cache at every context switch. 1053 Note that setting specific bits in the ACTLR register may not be 1054 available in non-secure mode. 1055 1056config ARM_ERRATA_458693 1057 bool "ARM errata: Processor deadlock when a false hazard is created" 1058 depends on CPU_V7 1059 depends on !ARCH_MULTIPLATFORM 1060 help 1061 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1062 erratum. For very specific sequences of memory operations, it is 1063 possible for a hazard condition intended for a cache line to instead 1064 be incorrectly associated with a different cache line. This false 1065 hazard might then cause a processor deadlock. The workaround enables 1066 the L1 caching of the NEON accesses and disables the PLD instruction 1067 in the ACTLR register. Note that setting specific bits in the ACTLR 1068 register may not be available in non-secure mode. 1069 1070config ARM_ERRATA_460075 1071 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1072 depends on CPU_V7 1073 depends on !ARCH_MULTIPLATFORM 1074 help 1075 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1076 erratum. Any asynchronous access to the L2 cache may encounter a 1077 situation in which recent store transactions to the L2 cache are lost 1078 and overwritten with stale memory contents from external memory. The 1079 workaround disables the write-allocate mode for the L2 cache via the 1080 ACTLR register. Note that setting specific bits in the ACTLR register 1081 may not be available in non-secure mode. 1082 1083config ARM_ERRATA_742230 1084 bool "ARM errata: DMB operation may be faulty" 1085 depends on CPU_V7 && SMP 1086 depends on !ARCH_MULTIPLATFORM 1087 help 1088 This option enables the workaround for the 742230 Cortex-A9 1089 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1090 between two write operations may not ensure the correct visibility 1091 ordering of the two writes. This workaround sets a specific bit in 1092 the diagnostic register of the Cortex-A9 which causes the DMB 1093 instruction to behave as a DSB, ensuring the correct behaviour of 1094 the two writes. 1095 1096config ARM_ERRATA_742231 1097 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1098 depends on CPU_V7 && SMP 1099 depends on !ARCH_MULTIPLATFORM 1100 help 1101 This option enables the workaround for the 742231 Cortex-A9 1102 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1103 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1104 accessing some data located in the same cache line, may get corrupted 1105 data due to bad handling of the address hazard when the line gets 1106 replaced from one of the CPUs at the same time as another CPU is 1107 accessing it. This workaround sets specific bits in the diagnostic 1108 register of the Cortex-A9 which reduces the linefill issuing 1109 capabilities of the processor. 1110 1111config ARM_ERRATA_643719 1112 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1113 depends on CPU_V7 && SMP 1114 default y 1115 help 1116 This option enables the workaround for the 643719 Cortex-A9 (prior to 1117 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1118 register returns zero when it should return one. The workaround 1119 corrects this value, ensuring cache maintenance operations which use 1120 it behave as intended and avoiding data corruption. 1121 1122config ARM_ERRATA_720789 1123 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1124 depends on CPU_V7 1125 help 1126 This option enables the workaround for the 720789 Cortex-A9 (prior to 1127 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1128 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1129 As a consequence of this erratum, some TLB entries which should be 1130 invalidated are not, resulting in an incoherency in the system page 1131 tables. The workaround changes the TLB flushing routines to invalidate 1132 entries regardless of the ASID. 1133 1134config ARM_ERRATA_743622 1135 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1136 depends on CPU_V7 1137 depends on !ARCH_MULTIPLATFORM 1138 help 1139 This option enables the workaround for the 743622 Cortex-A9 1140 (r2p*) erratum. Under very rare conditions, a faulty 1141 optimisation in the Cortex-A9 Store Buffer may lead to data 1142 corruption. This workaround sets a specific bit in the diagnostic 1143 register of the Cortex-A9 which disables the Store Buffer 1144 optimisation, preventing the defect from occurring. This has no 1145 visible impact on the overall performance or power consumption of the 1146 processor. 1147 1148config ARM_ERRATA_751472 1149 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1150 depends on CPU_V7 1151 depends on !ARCH_MULTIPLATFORM 1152 help 1153 This option enables the workaround for the 751472 Cortex-A9 (prior 1154 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1155 completion of a following broadcasted operation if the second 1156 operation is received by a CPU before the ICIALLUIS has completed, 1157 potentially leading to corrupted entries in the cache or TLB. 1158 1159config ARM_ERRATA_754322 1160 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1161 depends on CPU_V7 1162 help 1163 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1164 r3p*) erratum. A speculative memory access may cause a page table walk 1165 which starts prior to an ASID switch but completes afterwards. This 1166 can populate the micro-TLB with a stale entry which may be hit with 1167 the new ASID. This workaround places two dsb instructions in the mm 1168 switching code so that no page table walks can cross the ASID switch. 1169 1170config ARM_ERRATA_754327 1171 bool "ARM errata: no automatic Store Buffer drain" 1172 depends on CPU_V7 && SMP 1173 help 1174 This option enables the workaround for the 754327 Cortex-A9 (prior to 1175 r2p0) erratum. The Store Buffer does not have any automatic draining 1176 mechanism and therefore a livelock may occur if an external agent 1177 continuously polls a memory location waiting to observe an update. 1178 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1179 written polling loops from denying visibility of updates to memory. 1180 1181config ARM_ERRATA_364296 1182 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1183 depends on CPU_V6 1184 help 1185 This options enables the workaround for the 364296 ARM1136 1186 r0p2 erratum (possible cache data corruption with 1187 hit-under-miss enabled). It sets the undocumented bit 31 in 1188 the auxiliary control register and the FI bit in the control 1189 register, thus disabling hit-under-miss without putting the 1190 processor into full low interrupt latency mode. ARM11MPCore 1191 is not affected. 1192 1193config ARM_ERRATA_764369 1194 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1195 depends on CPU_V7 && SMP 1196 help 1197 This option enables the workaround for erratum 764369 1198 affecting Cortex-A9 MPCore with two or more processors (all 1199 current revisions). Under certain timing circumstances, a data 1200 cache line maintenance operation by MVA targeting an Inner 1201 Shareable memory region may fail to proceed up to either the 1202 Point of Coherency or to the Point of Unification of the 1203 system. This workaround adds a DSB instruction before the 1204 relevant cache maintenance functions and sets a specific bit 1205 in the diagnostic control register of the SCU. 1206 1207config ARM_ERRATA_775420 1208 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1209 depends on CPU_V7 1210 help 1211 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1212 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1213 operation aborts with MMU exception, it might cause the processor 1214 to deadlock. This workaround puts DSB before executing ISB if 1215 an abort may occur on cache maintenance. 1216 1217config ARM_ERRATA_798181 1218 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1219 depends on CPU_V7 && SMP 1220 help 1221 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1222 adequately shooting down all use of the old entries. This 1223 option enables the Linux kernel workaround for this erratum 1224 which sends an IPI to the CPUs that are running the same ASID 1225 as the one being invalidated. 1226 1227config ARM_ERRATA_773022 1228 bool "ARM errata: incorrect instructions may be executed from loop buffer" 1229 depends on CPU_V7 1230 help 1231 This option enables the workaround for the 773022 Cortex-A15 1232 (up to r0p4) erratum. In certain rare sequences of code, the 1233 loop buffer may deliver incorrect instructions. This 1234 workaround disables the loop buffer to avoid the erratum. 1235 1236endmenu 1237 1238source "arch/arm/common/Kconfig" 1239 1240menu "Bus support" 1241 1242config ISA 1243 bool 1244 help 1245 Find out whether you have ISA slots on your motherboard. ISA is the 1246 name of a bus system, i.e. the way the CPU talks to the other stuff 1247 inside your box. Other bus systems are PCI, EISA, MicroChannel 1248 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1249 newer boards don't support it. If you have ISA, say Y, otherwise N. 1250 1251# Select ISA DMA controller support 1252config ISA_DMA 1253 bool 1254 select ISA_DMA_API 1255 1256# Select ISA DMA interface 1257config ISA_DMA_API 1258 bool 1259 1260config PCI 1261 bool "PCI support" if MIGHT_HAVE_PCI 1262 help 1263 Find out whether you have a PCI motherboard. PCI is the name of a 1264 bus system, i.e. the way the CPU talks to the other stuff inside 1265 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1266 VESA. If you have PCI, say Y, otherwise N. 1267 1268config PCI_DOMAINS 1269 bool 1270 depends on PCI 1271 1272config PCI_DOMAINS_GENERIC 1273 def_bool PCI_DOMAINS 1274 1275config PCI_NANOENGINE 1276 bool "BSE nanoEngine PCI support" 1277 depends on SA1100_NANOENGINE 1278 help 1279 Enable PCI on the BSE nanoEngine board. 1280 1281config PCI_SYSCALL 1282 def_bool PCI 1283 1284config PCI_HOST_ITE8152 1285 bool 1286 depends on PCI && MACH_ARMCORE 1287 default y 1288 select DMABOUNCE 1289 1290source "drivers/pci/Kconfig" 1291source "drivers/pci/pcie/Kconfig" 1292 1293source "drivers/pcmcia/Kconfig" 1294 1295endmenu 1296 1297menu "Kernel Features" 1298 1299config HAVE_SMP 1300 bool 1301 help 1302 This option should be selected by machines which have an SMP- 1303 capable CPU. 1304 1305 The only effect of this option is to make the SMP-related 1306 options available to the user for configuration. 1307 1308config SMP 1309 bool "Symmetric Multi-Processing" 1310 depends on CPU_V6K || CPU_V7 1311 depends on GENERIC_CLOCKEVENTS 1312 depends on HAVE_SMP 1313 depends on MMU || ARM_MPU 1314 select IRQ_WORK 1315 help 1316 This enables support for systems with more than one CPU. If you have 1317 a system with only one CPU, say N. If you have a system with more 1318 than one CPU, say Y. 1319 1320 If you say N here, the kernel will run on uni- and multiprocessor 1321 machines, but will use only one CPU of a multiprocessor machine. If 1322 you say Y here, the kernel will run on many, but not all, 1323 uniprocessor machines. On a uniprocessor machine, the kernel 1324 will run faster if you say N here. 1325 1326 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1327 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1328 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1329 1330 If you don't know what to do here, say N. 1331 1332config SMP_ON_UP 1333 bool "Allow booting SMP kernel on uniprocessor systems" 1334 depends on SMP && !XIP_KERNEL && MMU 1335 default y 1336 help 1337 SMP kernels contain instructions which fail on non-SMP processors. 1338 Enabling this option allows the kernel to modify itself to make 1339 these instructions safe. Disabling it allows about 1K of space 1340 savings. 1341 1342 If you don't know what to do here, say Y. 1343 1344config ARM_CPU_TOPOLOGY 1345 bool "Support cpu topology definition" 1346 depends on SMP && CPU_V7 1347 default y 1348 help 1349 Support ARM cpu topology definition. The MPIDR register defines 1350 affinity between processors which is then used to describe the cpu 1351 topology of an ARM System. 1352 1353config SCHED_MC 1354 bool "Multi-core scheduler support" 1355 depends on ARM_CPU_TOPOLOGY 1356 help 1357 Multi-core scheduler support improves the CPU scheduler's decision 1358 making when dealing with multi-core CPU chips at a cost of slightly 1359 increased overhead in some places. If unsure say N here. 1360 1361config SCHED_SMT 1362 bool "SMT scheduler support" 1363 depends on ARM_CPU_TOPOLOGY 1364 help 1365 Improves the CPU scheduler's decision making when dealing with 1366 MultiThreading at a cost of slightly increased overhead in some 1367 places. If unsure say N here. 1368 1369config HAVE_ARM_SCU 1370 bool 1371 help 1372 This option enables support for the ARM system coherency unit 1373 1374config HAVE_ARM_ARCH_TIMER 1375 bool "Architected timer support" 1376 depends on CPU_V7 1377 select ARM_ARCH_TIMER 1378 select GENERIC_CLOCKEVENTS 1379 help 1380 This option enables support for the ARM architected timer 1381 1382config HAVE_ARM_TWD 1383 bool 1384 select CLKSRC_OF if OF 1385 help 1386 This options enables support for the ARM timer and watchdog unit 1387 1388config MCPM 1389 bool "Multi-Cluster Power Management" 1390 depends on CPU_V7 && SMP 1391 help 1392 This option provides the common power management infrastructure 1393 for (multi-)cluster based systems, such as big.LITTLE based 1394 systems. 1395 1396config MCPM_QUAD_CLUSTER 1397 bool 1398 depends on MCPM 1399 help 1400 To avoid wasting resources unnecessarily, MCPM only supports up 1401 to 2 clusters by default. 1402 Platforms with 3 or 4 clusters that use MCPM must select this 1403 option to allow the additional clusters to be managed. 1404 1405config BIG_LITTLE 1406 bool "big.LITTLE support (Experimental)" 1407 depends on CPU_V7 && SMP 1408 select MCPM 1409 help 1410 This option enables support selections for the big.LITTLE 1411 system architecture. 1412 1413config BL_SWITCHER 1414 bool "big.LITTLE switcher support" 1415 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU 1416 select ARM_CPU_SUSPEND 1417 select CPU_PM 1418 help 1419 The big.LITTLE "switcher" provides the core functionality to 1420 transparently handle transition between a cluster of A15's 1421 and a cluster of A7's in a big.LITTLE system. 1422 1423config BL_SWITCHER_DUMMY_IF 1424 tristate "Simple big.LITTLE switcher user interface" 1425 depends on BL_SWITCHER && DEBUG_KERNEL 1426 help 1427 This is a simple and dummy char dev interface to control 1428 the big.LITTLE switcher core code. It is meant for 1429 debugging purposes only. 1430 1431choice 1432 prompt "Memory split" 1433 depends on MMU 1434 default VMSPLIT_3G 1435 help 1436 Select the desired split between kernel and user memory. 1437 1438 If you are not absolutely sure what you are doing, leave this 1439 option alone! 1440 1441 config VMSPLIT_3G 1442 bool "3G/1G user/kernel split" 1443 config VMSPLIT_3G_OPT 1444 bool "3G/1G user/kernel split (for full 1G low memory)" 1445 config VMSPLIT_2G 1446 bool "2G/2G user/kernel split" 1447 config VMSPLIT_1G 1448 bool "1G/3G user/kernel split" 1449endchoice 1450 1451config PAGE_OFFSET 1452 hex 1453 default PHYS_OFFSET if !MMU 1454 default 0x40000000 if VMSPLIT_1G 1455 default 0x80000000 if VMSPLIT_2G 1456 default 0xB0000000 if VMSPLIT_3G_OPT 1457 default 0xC0000000 1458 1459config NR_CPUS 1460 int "Maximum number of CPUs (2-32)" 1461 range 2 32 1462 depends on SMP 1463 default "4" 1464 1465config HOTPLUG_CPU 1466 bool "Support for hot-pluggable CPUs" 1467 depends on SMP 1468 help 1469 Say Y here to experiment with turning CPUs off and on. CPUs 1470 can be controlled through /sys/devices/system/cpu. 1471 1472config ARM_PSCI 1473 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1474 depends on CPU_V7 1475 select ARM_PSCI_FW 1476 help 1477 Say Y here if you want Linux to communicate with system firmware 1478 implementing the PSCI specification for CPU-centric power 1479 management operations described in ARM document number ARM DEN 1480 0022A ("Power State Coordination Interface System Software on 1481 ARM processors"). 1482 1483# The GPIO number here must be sorted by descending number. In case of 1484# a multiplatform kernel, we just want the highest value required by the 1485# selected platforms. 1486config ARCH_NR_GPIO 1487 int 1488 default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \ 1489 ARCH_ZYNQ 1490 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ 1491 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 1492 default 416 if ARCH_SUNXI 1493 default 392 if ARCH_U8500 1494 default 352 if ARCH_VT8500 1495 default 288 if ARCH_ROCKCHIP 1496 default 264 if MACH_H4700 1497 default 0 1498 help 1499 Maximum number of GPIOs in the system. 1500 1501 If unsure, leave the default value. 1502 1503source kernel/Kconfig.preempt 1504 1505config HZ_FIXED 1506 int 1507 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ 1508 ARCH_S5PV210 || ARCH_EXYNOS4 1509 default 128 if SOC_AT91RM9200 1510 default 0 1511 1512choice 1513 depends on HZ_FIXED = 0 1514 prompt "Timer frequency" 1515 1516config HZ_100 1517 bool "100 Hz" 1518 1519config HZ_200 1520 bool "200 Hz" 1521 1522config HZ_250 1523 bool "250 Hz" 1524 1525config HZ_300 1526 bool "300 Hz" 1527 1528config HZ_500 1529 bool "500 Hz" 1530 1531config HZ_1000 1532 bool "1000 Hz" 1533 1534endchoice 1535 1536config HZ 1537 int 1538 default HZ_FIXED if HZ_FIXED != 0 1539 default 100 if HZ_100 1540 default 200 if HZ_200 1541 default 250 if HZ_250 1542 default 300 if HZ_300 1543 default 500 if HZ_500 1544 default 1000 1545 1546config SCHED_HRTICK 1547 def_bool HIGH_RES_TIMERS 1548 1549config THUMB2_KERNEL 1550 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1551 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1552 default y if CPU_THUMBONLY 1553 select AEABI 1554 select ARM_ASM_UNIFIED 1555 select ARM_UNWIND 1556 help 1557 By enabling this option, the kernel will be compiled in 1558 Thumb-2 mode. A compiler/assembler that understand the unified 1559 ARM-Thumb syntax is needed. 1560 1561 If unsure, say N. 1562 1563config THUMB2_AVOID_R_ARM_THM_JUMP11 1564 bool "Work around buggy Thumb-2 short branch relocations in gas" 1565 depends on THUMB2_KERNEL && MODULES 1566 default y 1567 help 1568 Various binutils versions can resolve Thumb-2 branches to 1569 locally-defined, preemptible global symbols as short-range "b.n" 1570 branch instructions. 1571 1572 This is a problem, because there's no guarantee the final 1573 destination of the symbol, or any candidate locations for a 1574 trampoline, are within range of the branch. For this reason, the 1575 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1576 relocation in modules at all, and it makes little sense to add 1577 support. 1578 1579 The symptom is that the kernel fails with an "unsupported 1580 relocation" error when loading some modules. 1581 1582 Until fixed tools are available, passing 1583 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1584 code which hits this problem, at the cost of a bit of extra runtime 1585 stack usage in some cases. 1586 1587 The problem is described in more detail at: 1588 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1589 1590 Only Thumb-2 kernels are affected. 1591 1592 Unless you are sure your tools don't have this problem, say Y. 1593 1594config ARM_ASM_UNIFIED 1595 bool 1596 1597config AEABI 1598 bool "Use the ARM EABI to compile the kernel" 1599 help 1600 This option allows for the kernel to be compiled using the latest 1601 ARM ABI (aka EABI). This is only useful if you are using a user 1602 space environment that is also compiled with EABI. 1603 1604 Since there are major incompatibilities between the legacy ABI and 1605 EABI, especially with regard to structure member alignment, this 1606 option also changes the kernel syscall calling convention to 1607 disambiguate both ABIs and allow for backward compatibility support 1608 (selected with CONFIG_OABI_COMPAT). 1609 1610 To use this you need GCC version 4.0.0 or later. 1611 1612config OABI_COMPAT 1613 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1614 depends on AEABI && !THUMB2_KERNEL 1615 help 1616 This option preserves the old syscall interface along with the 1617 new (ARM EABI) one. It also provides a compatibility layer to 1618 intercept syscalls that have structure arguments which layout 1619 in memory differs between the legacy ABI and the new ARM EABI 1620 (only for non "thumb" binaries). This option adds a tiny 1621 overhead to all syscalls and produces a slightly larger kernel. 1622 1623 The seccomp filter system will not be available when this is 1624 selected, since there is no way yet to sensibly distinguish 1625 between calling conventions during filtering. 1626 1627 If you know you'll be using only pure EABI user space then you 1628 can say N here. If this option is not selected and you attempt 1629 to execute a legacy ABI binary then the result will be 1630 UNPREDICTABLE (in fact it can be predicted that it won't work 1631 at all). If in doubt say N. 1632 1633config ARCH_HAS_HOLES_MEMORYMODEL 1634 bool 1635 1636config ARCH_SPARSEMEM_ENABLE 1637 bool 1638 1639config ARCH_SPARSEMEM_DEFAULT 1640 def_bool ARCH_SPARSEMEM_ENABLE 1641 1642config ARCH_SELECT_MEMORY_MODEL 1643 def_bool ARCH_SPARSEMEM_ENABLE 1644 1645config HAVE_ARCH_PFN_VALID 1646 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1647 1648config HAVE_GENERIC_RCU_GUP 1649 def_bool y 1650 depends on ARM_LPAE 1651 1652config HIGHMEM 1653 bool "High Memory Support" 1654 depends on MMU 1655 help 1656 The address space of ARM processors is only 4 Gigabytes large 1657 and it has to accommodate user address space, kernel address 1658 space as well as some memory mapped IO. That means that, if you 1659 have a large amount of physical memory and/or IO, not all of the 1660 memory can be "permanently mapped" by the kernel. The physical 1661 memory that is not permanently mapped is called "high memory". 1662 1663 Depending on the selected kernel/user memory split, minimum 1664 vmalloc space and actual amount of RAM, you may not need this 1665 option which should result in a slightly faster kernel. 1666 1667 If unsure, say n. 1668 1669config HIGHPTE 1670 bool "Allocate 2nd-level pagetables from highmem" if EXPERT 1671 depends on HIGHMEM 1672 default y 1673 help 1674 The VM uses one page of physical memory for each page table. 1675 For systems with a lot of processes, this can use a lot of 1676 precious low memory, eventually leading to low memory being 1677 consumed by page tables. Setting this option will allow 1678 user-space 2nd level page tables to reside in high memory. 1679 1680config CPU_SW_DOMAIN_PAN 1681 bool "Enable use of CPU domains to implement privileged no-access" 1682 depends on MMU && !ARM_LPAE 1683 default y 1684 help 1685 Increase kernel security by ensuring that normal kernel accesses 1686 are unable to access userspace addresses. This can help prevent 1687 use-after-free bugs becoming an exploitable privilege escalation 1688 by ensuring that magic values (such as LIST_POISON) will always 1689 fault when dereferenced. 1690 1691 CPUs with low-vector mappings use a best-efforts implementation. 1692 Their lower 1MB needs to remain accessible for the vectors, but 1693 the remainder of userspace will become appropriately inaccessible. 1694 1695config HW_PERF_EVENTS 1696 def_bool y 1697 depends on ARM_PMU 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 1710config ARM_MODULE_PLTS 1711 bool "Use PLTs to allow module memory to spill over into vmalloc area" 1712 depends on MODULES 1713 help 1714 Allocate PLTs when loading modules so that jumps and calls whose 1715 targets are too far away for their relative offsets to be encoded 1716 in the instructions themselves can be bounced via veneers in the 1717 module's PLT. This allows modules to be allocated in the generic 1718 vmalloc area after the dedicated module memory area has been 1719 exhausted. The modules will use slightly more memory, but after 1720 rounding up to page size, the actual memory footprint is usually 1721 the same. 1722 1723 Say y if you are getting out of memory errors while loading modules 1724 1725source "mm/Kconfig" 1726 1727config FORCE_MAX_ZONEORDER 1728 int "Maximum zone order" 1729 default "12" if SOC_AM33XX 1730 default "9" if SA1111 || ARCH_EFM32 1731 default "11" 1732 help 1733 The kernel memory allocator divides physically contiguous memory 1734 blocks into "zones", where each zone is a power of two number of 1735 pages. This option selects the largest power of two that the kernel 1736 keeps in the memory allocator. If you need to allocate very large 1737 blocks of physically contiguous memory, then you may need to 1738 increase this value. 1739 1740 This config option is actually maximum order plus one. For example, 1741 a value of 11 means that the largest free memory block is 2^10 pages. 1742 1743config ALIGNMENT_TRAP 1744 bool 1745 depends on CPU_CP15_MMU 1746 default y if !ARCH_EBSA110 1747 select HAVE_PROC_CPU if PROC_FS 1748 help 1749 ARM processors cannot fetch/store information which is not 1750 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1751 address divisible by 4. On 32-bit ARM processors, these non-aligned 1752 fetch/store instructions will be emulated in software if you say 1753 here, which has a severe performance impact. This is necessary for 1754 correct operation of some network protocols. With an IP-only 1755 configuration it is safe to say N, otherwise say Y. 1756 1757config UACCESS_WITH_MEMCPY 1758 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1759 depends on MMU 1760 default y if CPU_FEROCEON 1761 help 1762 Implement faster copy_to_user and clear_user methods for CPU 1763 cores where a 8-word STM instruction give significantly higher 1764 memory write throughput than a sequence of individual 32bit stores. 1765 1766 A possible side effect is a slight increase in scheduling latency 1767 between threads sharing the same address space if they invoke 1768 such copy operations with large buffers. 1769 1770 However, if the CPU data cache is using a write-allocate mode, 1771 this option is unlikely to provide any performance gain. 1772 1773config SECCOMP 1774 bool 1775 prompt "Enable seccomp to safely compute untrusted bytecode" 1776 ---help--- 1777 This kernel feature is useful for number crunching applications 1778 that may need to compute untrusted bytecode during their 1779 execution. By using pipes or other transports made available to 1780 the process as file descriptors supporting the read/write 1781 syscalls, it's possible to isolate those applications in 1782 their own address space using seccomp. Once seccomp is 1783 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1784 and the task is only allowed to execute a few safe syscalls 1785 defined by each seccomp mode. 1786 1787config SWIOTLB 1788 def_bool y 1789 1790config IOMMU_HELPER 1791 def_bool SWIOTLB 1792 1793config XEN_DOM0 1794 def_bool y 1795 depends on XEN 1796 1797config XEN 1798 bool "Xen guest support on ARM" 1799 depends on ARM && AEABI && OF 1800 depends on CPU_V7 && !CPU_V6 1801 depends on !GENERIC_ATOMIC64 1802 depends on MMU 1803 select ARCH_DMA_ADDR_T_64BIT 1804 select ARM_PSCI 1805 select SWIOTLB_XEN 1806 help 1807 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1808 1809endmenu 1810 1811menu "Boot options" 1812 1813config USE_OF 1814 bool "Flattened Device Tree support" 1815 select IRQ_DOMAIN 1816 select OF 1817 select OF_EARLY_FLATTREE 1818 select OF_RESERVED_MEM 1819 help 1820 Include support for flattened device tree machine descriptions. 1821 1822config ATAGS 1823 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1824 default y 1825 help 1826 This is the traditional way of passing data to the kernel at boot 1827 time. If you are solely relying on the flattened device tree (or 1828 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1829 to remove ATAGS support from your kernel binary. If unsure, 1830 leave this to y. 1831 1832config DEPRECATED_PARAM_STRUCT 1833 bool "Provide old way to pass kernel parameters" 1834 depends on ATAGS 1835 help 1836 This was deprecated in 2001 and announced to live on for 5 years. 1837 Some old boot loaders still use this way. 1838 1839# Compressed boot loader in ROM. Yes, we really want to ask about 1840# TEXT and BSS so we preserve their values in the config files. 1841config ZBOOT_ROM_TEXT 1842 hex "Compressed ROM boot loader base address" 1843 default "0" 1844 help 1845 The physical address at which the ROM-able zImage is to be 1846 placed in the target. Platforms which normally make use of 1847 ROM-able zImage formats normally set this to a suitable 1848 value in their defconfig file. 1849 1850 If ZBOOT_ROM is not enabled, this has no effect. 1851 1852config ZBOOT_ROM_BSS 1853 hex "Compressed ROM boot loader BSS address" 1854 default "0" 1855 help 1856 The base address of an area of read/write memory in the target 1857 for the ROM-able zImage which must be available while the 1858 decompressor is running. It must be large enough to hold the 1859 entire decompressed kernel plus an additional 128 KiB. 1860 Platforms which normally make use of ROM-able zImage formats 1861 normally set this to a suitable value in their defconfig file. 1862 1863 If ZBOOT_ROM is not enabled, this has no effect. 1864 1865config ZBOOT_ROM 1866 bool "Compressed boot loader in ROM/flash" 1867 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1868 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1869 help 1870 Say Y here if you intend to execute your compressed kernel image 1871 (zImage) directly from ROM or flash. If unsure, say N. 1872 1873config ARM_APPENDED_DTB 1874 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1875 depends on OF 1876 help 1877 With this option, the boot code will look for a device tree binary 1878 (DTB) appended to zImage 1879 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1880 1881 This is meant as a backward compatibility convenience for those 1882 systems with a bootloader that can't be upgraded to accommodate 1883 the documented boot protocol using a device tree. 1884 1885 Beware that there is very little in terms of protection against 1886 this option being confused by leftover garbage in memory that might 1887 look like a DTB header after a reboot if no actual DTB is appended 1888 to zImage. Do not leave this option active in a production kernel 1889 if you don't intend to always append a DTB. Proper passing of the 1890 location into r2 of a bootloader provided DTB is always preferable 1891 to this option. 1892 1893config ARM_ATAG_DTB_COMPAT 1894 bool "Supplement the appended DTB with traditional ATAG information" 1895 depends on ARM_APPENDED_DTB 1896 help 1897 Some old bootloaders can't be updated to a DTB capable one, yet 1898 they provide ATAGs with memory configuration, the ramdisk address, 1899 the kernel cmdline string, etc. Such information is dynamically 1900 provided by the bootloader and can't always be stored in a static 1901 DTB. To allow a device tree enabled kernel to be used with such 1902 bootloaders, this option allows zImage to extract the information 1903 from the ATAG list and store it at run time into the appended DTB. 1904 1905choice 1906 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1907 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1908 1909config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1910 bool "Use bootloader kernel arguments if available" 1911 help 1912 Uses the command-line options passed by the boot loader instead of 1913 the device tree bootargs property. If the boot loader doesn't provide 1914 any, the device tree bootargs property will be used. 1915 1916config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1917 bool "Extend with bootloader kernel arguments" 1918 help 1919 The command-line arguments provided by the boot loader will be 1920 appended to the the device tree bootargs property. 1921 1922endchoice 1923 1924config CMDLINE 1925 string "Default kernel command string" 1926 default "" 1927 help 1928 On some architectures (EBSA110 and CATS), there is currently no way 1929 for the boot loader to pass arguments to the kernel. For these 1930 architectures, you should supply some command-line options at build 1931 time by entering them here. As a minimum, you should specify the 1932 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1933 1934choice 1935 prompt "Kernel command line type" if CMDLINE != "" 1936 default CMDLINE_FROM_BOOTLOADER 1937 depends on ATAGS 1938 1939config CMDLINE_FROM_BOOTLOADER 1940 bool "Use bootloader kernel arguments if available" 1941 help 1942 Uses the command-line options passed by the boot loader. If 1943 the boot loader doesn't provide any, the default kernel command 1944 string provided in CMDLINE will be used. 1945 1946config CMDLINE_EXTEND 1947 bool "Extend bootloader kernel arguments" 1948 help 1949 The command-line arguments provided by the boot loader will be 1950 appended to the default kernel command string. 1951 1952config CMDLINE_FORCE 1953 bool "Always use the default kernel command string" 1954 help 1955 Always use the default kernel command string, even if the boot 1956 loader passes other arguments to the kernel. 1957 This is useful if you cannot or don't want to change the 1958 command-line options your boot loader passes to the kernel. 1959endchoice 1960 1961config XIP_KERNEL 1962 bool "Kernel Execute-In-Place from ROM" 1963 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1964 help 1965 Execute-In-Place allows the kernel to run from non-volatile storage 1966 directly addressable by the CPU, such as NOR flash. This saves RAM 1967 space since the text section of the kernel is not loaded from flash 1968 to RAM. Read-write sections, such as the data section and stack, 1969 are still copied to RAM. The XIP kernel is not compressed since 1970 it has to run directly from flash, so it will take more space to 1971 store it. The flash address used to link the kernel object files, 1972 and for storing it, is configuration dependent. Therefore, if you 1973 say Y here, you must know the proper physical address where to 1974 store the kernel image depending on your own flash memory usage. 1975 1976 Also note that the make target becomes "make xipImage" rather than 1977 "make zImage" or "make Image". The final kernel binary to put in 1978 ROM memory will be arch/arm/boot/xipImage. 1979 1980 If unsure, say N. 1981 1982config XIP_PHYS_ADDR 1983 hex "XIP Kernel Physical Location" 1984 depends on XIP_KERNEL 1985 default "0x00080000" 1986 help 1987 This is the physical address in your flash memory the kernel will 1988 be linked for and stored to. This address is dependent on your 1989 own flash usage. 1990 1991config KEXEC 1992 bool "Kexec system call (EXPERIMENTAL)" 1993 depends on (!SMP || PM_SLEEP_SMP) 1994 depends on !CPU_V7M 1995 select KEXEC_CORE 1996 help 1997 kexec is a system call that implements the ability to shutdown your 1998 current kernel, and to start another kernel. It is like a reboot 1999 but it is independent of the system firmware. And like a reboot 2000 you can start any kernel with it, not just Linux. 2001 2002 It is an ongoing process to be certain the hardware in a machine 2003 is properly shutdown, so do not be surprised if this code does not 2004 initially work for you. 2005 2006config ATAGS_PROC 2007 bool "Export atags in procfs" 2008 depends on ATAGS && KEXEC 2009 default y 2010 help 2011 Should the atags used to boot the kernel be exported in an "atags" 2012 file in procfs. Useful with kexec. 2013 2014config CRASH_DUMP 2015 bool "Build kdump crash kernel (EXPERIMENTAL)" 2016 help 2017 Generate crash dump after being started by kexec. This should 2018 be normally only set in special crash dump kernels which are 2019 loaded in the main kernel with kexec-tools into a specially 2020 reserved region and then later executed after a crash by 2021 kdump/kexec. The crash dump kernel must be compiled to a 2022 memory address not used by the main kernel 2023 2024 For more details see Documentation/kdump/kdump.txt 2025 2026config AUTO_ZRELADDR 2027 bool "Auto calculation of the decompressed kernel image address" 2028 help 2029 ZRELADDR is the physical address where the decompressed kernel 2030 image will be placed. If AUTO_ZRELADDR is selected, the address 2031 will be determined at run-time by masking the current IP with 2032 0xf8000000. This assumes the zImage being placed in the first 128MB 2033 from start of memory. 2034 2035endmenu 2036 2037menu "CPU Power Management" 2038 2039source "drivers/cpufreq/Kconfig" 2040 2041source "drivers/cpuidle/Kconfig" 2042 2043endmenu 2044 2045menu "Floating point emulation" 2046 2047comment "At least one emulation must be selected" 2048 2049config FPE_NWFPE 2050 bool "NWFPE math emulation" 2051 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2052 ---help--- 2053 Say Y to include the NWFPE floating point emulator in the kernel. 2054 This is necessary to run most binaries. Linux does not currently 2055 support floating point hardware so you need to say Y here even if 2056 your machine has an FPA or floating point co-processor podule. 2057 2058 You may say N here if you are going to load the Acorn FPEmulator 2059 early in the bootup. 2060 2061config FPE_NWFPE_XP 2062 bool "Support extended precision" 2063 depends on FPE_NWFPE 2064 help 2065 Say Y to include 80-bit support in the kernel floating-point 2066 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2067 Note that gcc does not generate 80-bit operations by default, 2068 so in most cases this option only enlarges the size of the 2069 floating point emulator without any good reason. 2070 2071 You almost surely want to say N here. 2072 2073config FPE_FASTFPE 2074 bool "FastFPE math emulation (EXPERIMENTAL)" 2075 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2076 ---help--- 2077 Say Y here to include the FAST floating point emulator in the kernel. 2078 This is an experimental much faster emulator which now also has full 2079 precision for the mantissa. It does not support any exceptions. 2080 It is very simple, and approximately 3-6 times faster than NWFPE. 2081 2082 It should be sufficient for most programs. It may be not suitable 2083 for scientific calculations, but you have to check this for yourself. 2084 If you do not feel you need a faster FP emulation you should better 2085 choose NWFPE. 2086 2087config VFP 2088 bool "VFP-format floating point maths" 2089 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2090 help 2091 Say Y to include VFP support code in the kernel. This is needed 2092 if your hardware includes a VFP unit. 2093 2094 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2095 release notes and additional status information. 2096 2097 Say N if your target does not have VFP hardware. 2098 2099config VFPv3 2100 bool 2101 depends on VFP 2102 default y if CPU_V7 2103 2104config NEON 2105 bool "Advanced SIMD (NEON) Extension support" 2106 depends on VFPv3 && CPU_V7 2107 help 2108 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2109 Extension. 2110 2111config KERNEL_MODE_NEON 2112 bool "Support for NEON in kernel mode" 2113 depends on NEON && AEABI 2114 help 2115 Say Y to include support for NEON in kernel mode. 2116 2117endmenu 2118 2119menu "Userspace binary formats" 2120 2121source "fs/Kconfig.binfmt" 2122 2123endmenu 2124 2125menu "Power management options" 2126 2127source "kernel/power/Kconfig" 2128 2129config ARCH_SUSPEND_POSSIBLE 2130 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 2131 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2132 def_bool y 2133 2134config ARM_CPU_SUSPEND 2135 def_bool PM_SLEEP 2136 2137config ARCH_HIBERNATION_POSSIBLE 2138 bool 2139 depends on MMU 2140 default y if ARCH_SUSPEND_POSSIBLE 2141 2142endmenu 2143 2144source "net/Kconfig" 2145 2146source "drivers/Kconfig" 2147 2148source "drivers/firmware/Kconfig" 2149 2150source "fs/Kconfig" 2151 2152source "arch/arm/Kconfig.debug" 2153 2154source "security/Kconfig" 2155 2156source "crypto/Kconfig" 2157if CRYPTO 2158source "arch/arm/crypto/Kconfig" 2159endif 2160 2161source "lib/Kconfig" 2162 2163source "arch/arm/kvm/Kconfig" 2164