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 GENERIC_HWEIGHT 192 bool 193 default y 194 195config GENERIC_CALIBRATE_DELAY 196 bool 197 default y 198 199config ARCH_MAY_HAVE_PC_FDC 200 bool 201 202config ZONE_DMA 203 bool 204 205config NEED_DMA_MAP_STATE 206 def_bool y 207 208config ARCH_SUPPORTS_UPROBES 209 def_bool y 210 211config ARCH_HAS_DMA_SET_COHERENT_MASK 212 bool 213 214config GENERIC_ISA_DMA 215 bool 216 217config FIQ 218 bool 219 220config NEED_RET_TO_USER 221 bool 222 223config ARCH_MTD_XIP 224 bool 225 226config VECTORS_BASE 227 hex 228 default 0xffff0000 if MMU || CPU_HIGH_VECTOR 229 default DRAM_BASE if REMAP_VECTORS_TO_RAM 230 default 0x00000000 231 help 232 The base address of exception vectors. This must be two pages 233 in size. 234 235config ARM_PATCH_PHYS_VIRT 236 bool "Patch physical to virtual translations at runtime" if EMBEDDED 237 default y 238 depends on !XIP_KERNEL && MMU 239 depends on !ARCH_REALVIEW || !SPARSEMEM 240 help 241 Patch phys-to-virt and virt-to-phys translation functions at 242 boot and module load time according to the position of the 243 kernel in system memory. 244 245 This can only be used with non-XIP MMU kernels where the base 246 of physical memory is at a 16MB boundary. 247 248 Only disable this option if you know that you do not require 249 this feature (eg, building a kernel for a single machine) and 250 you need to shrink the kernel to the minimal size. 251 252config NEED_MACH_IO_H 253 bool 254 help 255 Select this when mach/io.h is required to provide special 256 definitions for this platform. The need for mach/io.h should 257 be avoided when possible. 258 259config NEED_MACH_MEMORY_H 260 bool 261 help 262 Select this when mach/memory.h is required to provide special 263 definitions for this platform. The need for mach/memory.h should 264 be avoided when possible. 265 266config PHYS_OFFSET 267 hex "Physical address of main memory" if MMU 268 depends on !ARM_PATCH_PHYS_VIRT 269 default DRAM_BASE if !MMU 270 default 0x00000000 if ARCH_EBSA110 || \ 271 ARCH_FOOTBRIDGE || \ 272 ARCH_INTEGRATOR || \ 273 ARCH_IOP13XX || \ 274 ARCH_KS8695 || \ 275 (ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET) 276 default 0x10000000 if ARCH_OMAP1 || ARCH_RPC 277 default 0x20000000 if ARCH_S5PV210 278 default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET 279 default 0xc0000000 if ARCH_SA1100 280 help 281 Please provide the physical address corresponding to the 282 location of main memory in your system. 283 284config GENERIC_BUG 285 def_bool y 286 depends on BUG 287 288config PGTABLE_LEVELS 289 int 290 default 3 if ARM_LPAE 291 default 2 292 293source "init/Kconfig" 294 295source "kernel/Kconfig.freezer" 296 297menu "System Type" 298 299config MMU 300 bool "MMU-based Paged Memory Management Support" 301 default y 302 help 303 Select if you want MMU-based virtualised addressing space 304 support by paged memory management. If unsure, say 'Y'. 305 306# 307# The "ARM system type" choice list is ordered alphabetically by option 308# text. Please add new entries in the option alphabetic order. 309# 310choice 311 prompt "ARM system type" 312 default ARCH_VERSATILE if !MMU 313 default ARCH_MULTIPLATFORM if MMU 314 315config ARCH_MULTIPLATFORM 316 bool "Allow multiple platforms to be selected" 317 depends on MMU 318 select ARCH_WANT_OPTIONAL_GPIOLIB 319 select ARM_HAS_SG_CHAIN 320 select ARM_PATCH_PHYS_VIRT 321 select AUTO_ZRELADDR 322 select CLKSRC_OF 323 select COMMON_CLK 324 select GENERIC_CLOCKEVENTS 325 select MIGHT_HAVE_PCI 326 select MULTI_IRQ_HANDLER 327 select SPARSE_IRQ 328 select USE_OF 329 330config ARM_SINGLE_ARMV7M 331 bool "ARMv7-M based platforms (Cortex-M0/M3/M4)" 332 depends on !MMU 333 select ARCH_WANT_OPTIONAL_GPIOLIB 334 select ARM_NVIC 335 select AUTO_ZRELADDR 336 select CLKSRC_OF 337 select COMMON_CLK 338 select CPU_V7M 339 select GENERIC_CLOCKEVENTS 340 select NO_IOPORT_MAP 341 select SPARSE_IRQ 342 select USE_OF 343 344config ARCH_REALVIEW 345 bool "ARM Ltd. RealView family" 346 select ARCH_WANT_OPTIONAL_GPIOLIB 347 select ARM_AMBA 348 select ARM_TIMER_SP804 349 select COMMON_CLK 350 select COMMON_CLK_VERSATILE 351 select GENERIC_CLOCKEVENTS 352 select GPIO_PL061 if GPIOLIB 353 select ICST 354 select NEED_MACH_MEMORY_H 355 select PLAT_VERSATILE 356 select PLAT_VERSATILE_SCHED_CLOCK 357 help 358 This enables support for ARM Ltd RealView boards. 359 360config ARCH_VERSATILE 361 bool "ARM Ltd. Versatile family" 362 select ARCH_WANT_OPTIONAL_GPIOLIB 363 select ARM_AMBA 364 select ARM_TIMER_SP804 365 select ARM_VIC 366 select CLKDEV_LOOKUP 367 select GENERIC_CLOCKEVENTS 368 select HAVE_MACH_CLKDEV 369 select ICST 370 select PLAT_VERSATILE 371 select PLAT_VERSATILE_CLOCK 372 select PLAT_VERSATILE_SCHED_CLOCK 373 select VERSATILE_FPGA_IRQ 374 help 375 This enables support for ARM Ltd Versatile board. 376 377config ARCH_CLPS711X 378 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based" 379 select ARCH_REQUIRE_GPIOLIB 380 select AUTO_ZRELADDR 381 select CLKSRC_MMIO 382 select COMMON_CLK 383 select CPU_ARM720T 384 select GENERIC_CLOCKEVENTS 385 select MFD_SYSCON 386 select SOC_BUS 387 help 388 Support for Cirrus Logic 711x/721x/731x based boards. 389 390config ARCH_GEMINI 391 bool "Cortina Systems Gemini" 392 select ARCH_REQUIRE_GPIOLIB 393 select CLKSRC_MMIO 394 select CPU_FA526 395 select GENERIC_CLOCKEVENTS 396 help 397 Support for the Cortina Systems Gemini family SoCs 398 399config ARCH_EBSA110 400 bool "EBSA-110" 401 select ARCH_USES_GETTIMEOFFSET 402 select CPU_SA110 403 select ISA 404 select NEED_MACH_IO_H 405 select NEED_MACH_MEMORY_H 406 select NO_IOPORT_MAP 407 help 408 This is an evaluation board for the StrongARM processor available 409 from Digital. It has limited hardware on-board, including an 410 Ethernet interface, two PCMCIA sockets, two serial ports and a 411 parallel port. 412 413config ARCH_EP93XX 414 bool "EP93xx-based" 415 select ARCH_HAS_HOLES_MEMORYMODEL 416 select ARCH_REQUIRE_GPIOLIB 417 select ARM_AMBA 418 select ARM_PATCH_PHYS_VIRT 419 select ARM_VIC 420 select AUTO_ZRELADDR 421 select CLKDEV_LOOKUP 422 select CLKSRC_MMIO 423 select CPU_ARM920T 424 select GENERIC_CLOCKEVENTS 425 help 426 This enables support for the Cirrus EP93xx series of CPUs. 427 428config ARCH_FOOTBRIDGE 429 bool "FootBridge" 430 select CPU_SA110 431 select FOOTBRIDGE 432 select GENERIC_CLOCKEVENTS 433 select HAVE_IDE 434 select NEED_MACH_IO_H if !MMU 435 select NEED_MACH_MEMORY_H 436 help 437 Support for systems based on the DC21285 companion chip 438 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 439 440config ARCH_NETX 441 bool "Hilscher NetX based" 442 select ARM_VIC 443 select CLKSRC_MMIO 444 select CPU_ARM926T 445 select GENERIC_CLOCKEVENTS 446 help 447 This enables support for systems based on the Hilscher NetX Soc 448 449config ARCH_IOP13XX 450 bool "IOP13xx-based" 451 depends on MMU 452 select CPU_XSC3 453 select NEED_MACH_MEMORY_H 454 select NEED_RET_TO_USER 455 select PCI 456 select PLAT_IOP 457 select VMSPLIT_1G 458 select SPARSE_IRQ 459 help 460 Support for Intel's IOP13XX (XScale) family of processors. 461 462config ARCH_IOP32X 463 bool "IOP32x-based" 464 depends on MMU 465 select ARCH_REQUIRE_GPIOLIB 466 select CPU_XSCALE 467 select GPIO_IOP 468 select NEED_RET_TO_USER 469 select PCI 470 select PLAT_IOP 471 help 472 Support for Intel's 80219 and IOP32X (XScale) family of 473 processors. 474 475config ARCH_IOP33X 476 bool "IOP33x-based" 477 depends on MMU 478 select ARCH_REQUIRE_GPIOLIB 479 select CPU_XSCALE 480 select GPIO_IOP 481 select NEED_RET_TO_USER 482 select PCI 483 select PLAT_IOP 484 help 485 Support for Intel's IOP33X (XScale) family of processors. 486 487config ARCH_IXP4XX 488 bool "IXP4xx-based" 489 depends on MMU 490 select ARCH_HAS_DMA_SET_COHERENT_MASK 491 select ARCH_REQUIRE_GPIOLIB 492 select ARCH_SUPPORTS_BIG_ENDIAN 493 select CLKSRC_MMIO 494 select CPU_XSCALE 495 select DMABOUNCE if PCI 496 select GENERIC_CLOCKEVENTS 497 select MIGHT_HAVE_PCI 498 select NEED_MACH_IO_H 499 select USB_EHCI_BIG_ENDIAN_DESC 500 select USB_EHCI_BIG_ENDIAN_MMIO 501 help 502 Support for Intel's IXP4XX (XScale) family of processors. 503 504config ARCH_DOVE 505 bool "Marvell Dove" 506 select ARCH_REQUIRE_GPIOLIB 507 select CPU_PJ4 508 select GENERIC_CLOCKEVENTS 509 select MIGHT_HAVE_PCI 510 select MVEBU_MBUS 511 select PINCTRL 512 select PINCTRL_DOVE 513 select PLAT_ORION_LEGACY 514 help 515 Support for the Marvell Dove SoC 88AP510 516 517config ARCH_MV78XX0 518 bool "Marvell MV78xx0" 519 select ARCH_REQUIRE_GPIOLIB 520 select CPU_FEROCEON 521 select GENERIC_CLOCKEVENTS 522 select MVEBU_MBUS 523 select PCI 524 select PLAT_ORION_LEGACY 525 help 526 Support for the following Marvell MV78xx0 series SoCs: 527 MV781x0, MV782x0. 528 529config ARCH_ORION5X 530 bool "Marvell Orion" 531 depends on MMU 532 select ARCH_REQUIRE_GPIOLIB 533 select CPU_FEROCEON 534 select GENERIC_CLOCKEVENTS 535 select MVEBU_MBUS 536 select PCI 537 select PLAT_ORION_LEGACY 538 help 539 Support for the following Marvell Orion 5x series SoCs: 540 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 541 Orion-2 (5281), Orion-1-90 (6183). 542 543config ARCH_MMP 544 bool "Marvell PXA168/910/MMP2" 545 depends on MMU 546 select ARCH_REQUIRE_GPIOLIB 547 select CLKDEV_LOOKUP 548 select GENERIC_ALLOCATOR 549 select GENERIC_CLOCKEVENTS 550 select GPIO_PXA 551 select IRQ_DOMAIN 552 select MULTI_IRQ_HANDLER 553 select PINCTRL 554 select PLAT_PXA 555 select SPARSE_IRQ 556 help 557 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 558 559config ARCH_KS8695 560 bool "Micrel/Kendin KS8695" 561 select ARCH_REQUIRE_GPIOLIB 562 select CLKSRC_MMIO 563 select CPU_ARM922T 564 select GENERIC_CLOCKEVENTS 565 select NEED_MACH_MEMORY_H 566 help 567 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 568 System-on-Chip devices. 569 570config ARCH_W90X900 571 bool "Nuvoton W90X900 CPU" 572 select ARCH_REQUIRE_GPIOLIB 573 select CLKDEV_LOOKUP 574 select CLKSRC_MMIO 575 select CPU_ARM926T 576 select GENERIC_CLOCKEVENTS 577 help 578 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 579 At present, the w90x900 has been renamed nuc900, regarding 580 the ARM series product line, you can login the following 581 link address to know more. 582 583 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 584 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 585 586config ARCH_LPC32XX 587 bool "NXP LPC32XX" 588 select ARCH_REQUIRE_GPIOLIB 589 select ARM_AMBA 590 select CLKDEV_LOOKUP 591 select CLKSRC_MMIO 592 select CPU_ARM926T 593 select GENERIC_CLOCKEVENTS 594 select HAVE_IDE 595 select USE_OF 596 help 597 Support for the NXP LPC32XX family of processors 598 599config ARCH_PXA 600 bool "PXA2xx/PXA3xx-based" 601 depends on MMU 602 select ARCH_MTD_XIP 603 select ARCH_REQUIRE_GPIOLIB 604 select ARM_CPU_SUSPEND if PM 605 select AUTO_ZRELADDR 606 select COMMON_CLK 607 select CLKDEV_LOOKUP 608 select CLKSRC_MMIO 609 select CLKSRC_OF 610 select GENERIC_CLOCKEVENTS 611 select GPIO_PXA 612 select HAVE_IDE 613 select IRQ_DOMAIN 614 select MULTI_IRQ_HANDLER 615 select PLAT_PXA 616 select SPARSE_IRQ 617 help 618 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 619 620config ARCH_SHMOBILE_LEGACY 621 bool "Renesas ARM SoCs (non-multiplatform)" 622 select ARCH_SHMOBILE 623 select ARM_PATCH_PHYS_VIRT if MMU 624 select CLKDEV_LOOKUP 625 select CPU_V7 626 select GENERIC_CLOCKEVENTS 627 select HAVE_ARM_SCU if SMP 628 select HAVE_ARM_TWD if SMP 629 select HAVE_SMP 630 select MIGHT_HAVE_CACHE_L2X0 631 select MULTI_IRQ_HANDLER 632 select NO_IOPORT_MAP 633 select PINCTRL 634 select PM_GENERIC_DOMAINS if PM 635 select SH_CLK_CPG 636 select SPARSE_IRQ 637 help 638 Support for Renesas ARM SoC platforms using a non-multiplatform 639 kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car 640 and RZ families. 641 642config ARCH_RPC 643 bool "RiscPC" 644 select ARCH_ACORN 645 select ARCH_MAY_HAVE_PC_FDC 646 select ARCH_SPARSEMEM_ENABLE 647 select ARCH_USES_GETTIMEOFFSET 648 select CPU_SA110 649 select FIQ 650 select HAVE_IDE 651 select HAVE_PATA_PLATFORM 652 select ISA_DMA_API 653 select NEED_MACH_IO_H 654 select NEED_MACH_MEMORY_H 655 select NO_IOPORT_MAP 656 select VIRT_TO_BUS 657 help 658 On the Acorn Risc-PC, Linux can support the internal IDE disk and 659 CD-ROM interface, serial and parallel port, and the floppy drive. 660 661config ARCH_SA1100 662 bool "SA1100-based" 663 select ARCH_MTD_XIP 664 select ARCH_REQUIRE_GPIOLIB 665 select ARCH_SPARSEMEM_ENABLE 666 select CLKDEV_LOOKUP 667 select CLKSRC_MMIO 668 select CPU_FREQ 669 select CPU_SA1100 670 select GENERIC_CLOCKEVENTS 671 select HAVE_IDE 672 select IRQ_DOMAIN 673 select ISA 674 select MULTI_IRQ_HANDLER 675 select NEED_MACH_MEMORY_H 676 select SPARSE_IRQ 677 help 678 Support for StrongARM 11x0 based boards. 679 680config ARCH_S3C24XX 681 bool "Samsung S3C24XX SoCs" 682 select ARCH_REQUIRE_GPIOLIB 683 select ATAGS 684 select CLKDEV_LOOKUP 685 select CLKSRC_SAMSUNG_PWM 686 select GENERIC_CLOCKEVENTS 687 select GPIO_SAMSUNG 688 select HAVE_S3C2410_I2C if I2C 689 select HAVE_S3C2410_WATCHDOG if WATCHDOG 690 select HAVE_S3C_RTC if RTC_CLASS 691 select MULTI_IRQ_HANDLER 692 select NEED_MACH_IO_H 693 select SAMSUNG_ATAGS 694 help 695 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 696 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 697 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 698 Samsung SMDK2410 development board (and derivatives). 699 700config ARCH_S3C64XX 701 bool "Samsung S3C64XX" 702 select ARCH_REQUIRE_GPIOLIB 703 select ARM_AMBA 704 select ARM_VIC 705 select ATAGS 706 select CLKDEV_LOOKUP 707 select CLKSRC_SAMSUNG_PWM 708 select COMMON_CLK_SAMSUNG 709 select CPU_V6K 710 select GENERIC_CLOCKEVENTS 711 select GPIO_SAMSUNG 712 select HAVE_S3C2410_I2C if I2C 713 select HAVE_S3C2410_WATCHDOG if WATCHDOG 714 select HAVE_TCM 715 select NO_IOPORT_MAP 716 select PLAT_SAMSUNG 717 select PM_GENERIC_DOMAINS if PM 718 select S3C_DEV_NAND 719 select S3C_GPIO_TRACK 720 select SAMSUNG_ATAGS 721 select SAMSUNG_WAKEMASK 722 select SAMSUNG_WDT_RESET 723 help 724 Samsung S3C64XX series based systems 725 726config ARCH_DAVINCI 727 bool "TI DaVinci" 728 select ARCH_HAS_HOLES_MEMORYMODEL 729 select ARCH_REQUIRE_GPIOLIB 730 select CLKDEV_LOOKUP 731 select GENERIC_ALLOCATOR 732 select GENERIC_CLOCKEVENTS 733 select GENERIC_IRQ_CHIP 734 select HAVE_IDE 735 select TI_PRIV_EDMA 736 select USE_OF 737 select ZONE_DMA 738 help 739 Support for TI's DaVinci platform. 740 741config ARCH_OMAP1 742 bool "TI OMAP1" 743 depends on MMU 744 select ARCH_HAS_HOLES_MEMORYMODEL 745 select ARCH_OMAP 746 select ARCH_REQUIRE_GPIOLIB 747 select CLKDEV_LOOKUP 748 select CLKSRC_MMIO 749 select GENERIC_CLOCKEVENTS 750 select GENERIC_IRQ_CHIP 751 select HAVE_IDE 752 select IRQ_DOMAIN 753 select MULTI_IRQ_HANDLER 754 select NEED_MACH_IO_H if PCCARD 755 select NEED_MACH_MEMORY_H 756 select SPARSE_IRQ 757 help 758 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 759 760endchoice 761 762menu "Multiple platform selection" 763 depends on ARCH_MULTIPLATFORM 764 765comment "CPU Core family selection" 766 767config ARCH_MULTI_V4 768 bool "ARMv4 based platforms (FA526)" 769 depends on !ARCH_MULTI_V6_V7 770 select ARCH_MULTI_V4_V5 771 select CPU_FA526 772 773config ARCH_MULTI_V4T 774 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 775 depends on !ARCH_MULTI_V6_V7 776 select ARCH_MULTI_V4_V5 777 select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ 778 CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ 779 CPU_ARM925T || CPU_ARM940T) 780 781config ARCH_MULTI_V5 782 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 783 depends on !ARCH_MULTI_V6_V7 784 select ARCH_MULTI_V4_V5 785 select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \ 786 CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \ 787 CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON) 788 789config ARCH_MULTI_V4_V5 790 bool 791 792config ARCH_MULTI_V6 793 bool "ARMv6 based platforms (ARM11)" 794 select ARCH_MULTI_V6_V7 795 select CPU_V6K 796 797config ARCH_MULTI_V7 798 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 799 default y 800 select ARCH_MULTI_V6_V7 801 select CPU_V7 802 select HAVE_SMP 803 804config ARCH_MULTI_V6_V7 805 bool 806 select MIGHT_HAVE_CACHE_L2X0 807 808config ARCH_MULTI_CPU_AUTO 809 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 810 select ARCH_MULTI_V5 811 812endmenu 813 814config ARCH_VIRT 815 bool "Dummy Virtual Machine" if ARCH_MULTI_V7 816 select ARM_AMBA 817 select ARM_GIC 818 select ARM_PSCI 819 select HAVE_ARM_ARCH_TIMER 820 821# 822# This is sorted alphabetically by mach-* pathname. However, plat-* 823# Kconfigs may be included either alphabetically (according to the 824# plat- suffix) or along side the corresponding mach-* source. 825# 826source "arch/arm/mach-mvebu/Kconfig" 827 828source "arch/arm/mach-alpine/Kconfig" 829 830source "arch/arm/mach-asm9260/Kconfig" 831 832source "arch/arm/mach-at91/Kconfig" 833 834source "arch/arm/mach-axxia/Kconfig" 835 836source "arch/arm/mach-bcm/Kconfig" 837 838source "arch/arm/mach-berlin/Kconfig" 839 840source "arch/arm/mach-clps711x/Kconfig" 841 842source "arch/arm/mach-cns3xxx/Kconfig" 843 844source "arch/arm/mach-davinci/Kconfig" 845 846source "arch/arm/mach-digicolor/Kconfig" 847 848source "arch/arm/mach-dove/Kconfig" 849 850source "arch/arm/mach-ep93xx/Kconfig" 851 852source "arch/arm/mach-footbridge/Kconfig" 853 854source "arch/arm/mach-gemini/Kconfig" 855 856source "arch/arm/mach-highbank/Kconfig" 857 858source "arch/arm/mach-hisi/Kconfig" 859 860source "arch/arm/mach-integrator/Kconfig" 861 862source "arch/arm/mach-iop32x/Kconfig" 863 864source "arch/arm/mach-iop33x/Kconfig" 865 866source "arch/arm/mach-iop13xx/Kconfig" 867 868source "arch/arm/mach-ixp4xx/Kconfig" 869 870source "arch/arm/mach-keystone/Kconfig" 871 872source "arch/arm/mach-ks8695/Kconfig" 873 874source "arch/arm/mach-meson/Kconfig" 875 876source "arch/arm/mach-moxart/Kconfig" 877 878source "arch/arm/mach-mv78xx0/Kconfig" 879 880source "arch/arm/mach-imx/Kconfig" 881 882source "arch/arm/mach-mediatek/Kconfig" 883 884source "arch/arm/mach-mxs/Kconfig" 885 886source "arch/arm/mach-netx/Kconfig" 887 888source "arch/arm/mach-nomadik/Kconfig" 889 890source "arch/arm/mach-nspire/Kconfig" 891 892source "arch/arm/plat-omap/Kconfig" 893 894source "arch/arm/mach-omap1/Kconfig" 895 896source "arch/arm/mach-omap2/Kconfig" 897 898source "arch/arm/mach-orion5x/Kconfig" 899 900source "arch/arm/mach-picoxcell/Kconfig" 901 902source "arch/arm/mach-pxa/Kconfig" 903source "arch/arm/plat-pxa/Kconfig" 904 905source "arch/arm/mach-mmp/Kconfig" 906 907source "arch/arm/mach-qcom/Kconfig" 908 909source "arch/arm/mach-realview/Kconfig" 910 911source "arch/arm/mach-rockchip/Kconfig" 912 913source "arch/arm/mach-sa1100/Kconfig" 914 915source "arch/arm/mach-socfpga/Kconfig" 916 917source "arch/arm/mach-spear/Kconfig" 918 919source "arch/arm/mach-sti/Kconfig" 920 921source "arch/arm/mach-s3c24xx/Kconfig" 922 923source "arch/arm/mach-s3c64xx/Kconfig" 924 925source "arch/arm/mach-s5pv210/Kconfig" 926 927source "arch/arm/mach-exynos/Kconfig" 928source "arch/arm/plat-samsung/Kconfig" 929 930source "arch/arm/mach-shmobile/Kconfig" 931 932source "arch/arm/mach-sunxi/Kconfig" 933 934source "arch/arm/mach-prima2/Kconfig" 935 936source "arch/arm/mach-tegra/Kconfig" 937 938source "arch/arm/mach-u300/Kconfig" 939 940source "arch/arm/mach-uniphier/Kconfig" 941 942source "arch/arm/mach-ux500/Kconfig" 943 944source "arch/arm/mach-versatile/Kconfig" 945 946source "arch/arm/mach-vexpress/Kconfig" 947source "arch/arm/plat-versatile/Kconfig" 948 949source "arch/arm/mach-vt8500/Kconfig" 950 951source "arch/arm/mach-w90x900/Kconfig" 952 953source "arch/arm/mach-zx/Kconfig" 954 955source "arch/arm/mach-zynq/Kconfig" 956 957# ARMv7-M architecture 958config ARCH_EFM32 959 bool "Energy Micro efm32" 960 depends on ARM_SINGLE_ARMV7M 961 select ARCH_REQUIRE_GPIOLIB 962 help 963 Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko 964 processors. 965 966config ARCH_LPC18XX 967 bool "NXP LPC18xx/LPC43xx" 968 depends on ARM_SINGLE_ARMV7M 969 select ARCH_HAS_RESET_CONTROLLER 970 select ARM_AMBA 971 select CLKSRC_LPC32XX 972 select PINCTRL 973 help 974 Support for NXP's LPC18xx Cortex-M3 and LPC43xx Cortex-M4 975 high performance microcontrollers. 976 977config ARCH_STM32 978 bool "STMicrolectronics STM32" 979 depends on ARM_SINGLE_ARMV7M 980 select ARCH_HAS_RESET_CONTROLLER 981 select ARMV7M_SYSTICK 982 select CLKSRC_STM32 983 select RESET_CONTROLLER 984 help 985 Support for STMicroelectronics STM32 processors. 986 987# Definitions to make life easier 988config ARCH_ACORN 989 bool 990 991config PLAT_IOP 992 bool 993 select GENERIC_CLOCKEVENTS 994 995config PLAT_ORION 996 bool 997 select CLKSRC_MMIO 998 select COMMON_CLK 999 select GENERIC_IRQ_CHIP 1000 select IRQ_DOMAIN 1001 1002config PLAT_ORION_LEGACY 1003 bool 1004 select PLAT_ORION 1005 1006config PLAT_PXA 1007 bool 1008 1009config PLAT_VERSATILE 1010 bool 1011 1012source "arch/arm/firmware/Kconfig" 1013 1014source arch/arm/mm/Kconfig 1015 1016config IWMMXT 1017 bool "Enable iWMMXt support" 1018 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B 1019 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B 1020 help 1021 Enable support for iWMMXt context switching at run time if 1022 running on a CPU that supports it. 1023 1024config MULTI_IRQ_HANDLER 1025 bool 1026 help 1027 Allow each machine to specify it's own IRQ handler at run time. 1028 1029if !MMU 1030source "arch/arm/Kconfig-nommu" 1031endif 1032 1033config PJ4B_ERRATA_4742 1034 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1035 depends on CPU_PJ4B && MACH_ARMADA_370 1036 default y 1037 help 1038 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1039 Event (WFE) IDLE states, a specific timing sensitivity exists between 1040 the retiring WFI/WFE instructions and the newly issued subsequent 1041 instructions. This sensitivity can result in a CPU hang scenario. 1042 Workaround: 1043 The software must insert either a Data Synchronization Barrier (DSB) 1044 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1045 instruction 1046 1047config ARM_ERRATA_326103 1048 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1049 depends on CPU_V6 1050 help 1051 Executing a SWP instruction to read-only memory does not set bit 11 1052 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1053 treat the access as a read, preventing a COW from occurring and 1054 causing the faulting task to livelock. 1055 1056config ARM_ERRATA_411920 1057 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1058 depends on CPU_V6 || CPU_V6K 1059 help 1060 Invalidation of the Instruction Cache operation can 1061 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1062 It does not affect the MPCore. This option enables the ARM Ltd. 1063 recommended workaround. 1064 1065config ARM_ERRATA_430973 1066 bool "ARM errata: Stale prediction on replaced interworking branch" 1067 depends on CPU_V7 1068 help 1069 This option enables the workaround for the 430973 Cortex-A8 1070 r1p* erratum. If a code sequence containing an ARM/Thumb 1071 interworking branch is replaced with another code sequence at the 1072 same virtual address, whether due to self-modifying code or virtual 1073 to physical address re-mapping, Cortex-A8 does not recover from the 1074 stale interworking branch prediction. This results in Cortex-A8 1075 executing the new code sequence in the incorrect ARM or Thumb state. 1076 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1077 and also flushes the branch target cache at every context switch. 1078 Note that setting specific bits in the ACTLR register may not be 1079 available in non-secure mode. 1080 1081config ARM_ERRATA_458693 1082 bool "ARM errata: Processor deadlock when a false hazard is created" 1083 depends on CPU_V7 1084 depends on !ARCH_MULTIPLATFORM 1085 help 1086 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1087 erratum. For very specific sequences of memory operations, it is 1088 possible for a hazard condition intended for a cache line to instead 1089 be incorrectly associated with a different cache line. This false 1090 hazard might then cause a processor deadlock. The workaround enables 1091 the L1 caching of the NEON accesses and disables the PLD instruction 1092 in the ACTLR register. Note that setting specific bits in the ACTLR 1093 register may not be available in non-secure mode. 1094 1095config ARM_ERRATA_460075 1096 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1097 depends on CPU_V7 1098 depends on !ARCH_MULTIPLATFORM 1099 help 1100 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1101 erratum. Any asynchronous access to the L2 cache may encounter a 1102 situation in which recent store transactions to the L2 cache are lost 1103 and overwritten with stale memory contents from external memory. The 1104 workaround disables the write-allocate mode for the L2 cache via the 1105 ACTLR register. Note that setting specific bits in the ACTLR register 1106 may not be available in non-secure mode. 1107 1108config ARM_ERRATA_742230 1109 bool "ARM errata: DMB operation may be faulty" 1110 depends on CPU_V7 && SMP 1111 depends on !ARCH_MULTIPLATFORM 1112 help 1113 This option enables the workaround for the 742230 Cortex-A9 1114 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1115 between two write operations may not ensure the correct visibility 1116 ordering of the two writes. This workaround sets a specific bit in 1117 the diagnostic register of the Cortex-A9 which causes the DMB 1118 instruction to behave as a DSB, ensuring the correct behaviour of 1119 the two writes. 1120 1121config ARM_ERRATA_742231 1122 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1123 depends on CPU_V7 && SMP 1124 depends on !ARCH_MULTIPLATFORM 1125 help 1126 This option enables the workaround for the 742231 Cortex-A9 1127 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1128 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1129 accessing some data located in the same cache line, may get corrupted 1130 data due to bad handling of the address hazard when the line gets 1131 replaced from one of the CPUs at the same time as another CPU is 1132 accessing it. This workaround sets specific bits in the diagnostic 1133 register of the Cortex-A9 which reduces the linefill issuing 1134 capabilities of the processor. 1135 1136config ARM_ERRATA_643719 1137 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1138 depends on CPU_V7 && SMP 1139 default y 1140 help 1141 This option enables the workaround for the 643719 Cortex-A9 (prior to 1142 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1143 register returns zero when it should return one. The workaround 1144 corrects this value, ensuring cache maintenance operations which use 1145 it behave as intended and avoiding data corruption. 1146 1147config ARM_ERRATA_720789 1148 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1149 depends on CPU_V7 1150 help 1151 This option enables the workaround for the 720789 Cortex-A9 (prior to 1152 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1153 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1154 As a consequence of this erratum, some TLB entries which should be 1155 invalidated are not, resulting in an incoherency in the system page 1156 tables. The workaround changes the TLB flushing routines to invalidate 1157 entries regardless of the ASID. 1158 1159config ARM_ERRATA_743622 1160 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1161 depends on CPU_V7 1162 depends on !ARCH_MULTIPLATFORM 1163 help 1164 This option enables the workaround for the 743622 Cortex-A9 1165 (r2p*) erratum. Under very rare conditions, a faulty 1166 optimisation in the Cortex-A9 Store Buffer may lead to data 1167 corruption. This workaround sets a specific bit in the diagnostic 1168 register of the Cortex-A9 which disables the Store Buffer 1169 optimisation, preventing the defect from occurring. This has no 1170 visible impact on the overall performance or power consumption of the 1171 processor. 1172 1173config ARM_ERRATA_751472 1174 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1175 depends on CPU_V7 1176 depends on !ARCH_MULTIPLATFORM 1177 help 1178 This option enables the workaround for the 751472 Cortex-A9 (prior 1179 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1180 completion of a following broadcasted operation if the second 1181 operation is received by a CPU before the ICIALLUIS has completed, 1182 potentially leading to corrupted entries in the cache or TLB. 1183 1184config ARM_ERRATA_754322 1185 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1186 depends on CPU_V7 1187 help 1188 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1189 r3p*) erratum. A speculative memory access may cause a page table walk 1190 which starts prior to an ASID switch but completes afterwards. This 1191 can populate the micro-TLB with a stale entry which may be hit with 1192 the new ASID. This workaround places two dsb instructions in the mm 1193 switching code so that no page table walks can cross the ASID switch. 1194 1195config ARM_ERRATA_754327 1196 bool "ARM errata: no automatic Store Buffer drain" 1197 depends on CPU_V7 && SMP 1198 help 1199 This option enables the workaround for the 754327 Cortex-A9 (prior to 1200 r2p0) erratum. The Store Buffer does not have any automatic draining 1201 mechanism and therefore a livelock may occur if an external agent 1202 continuously polls a memory location waiting to observe an update. 1203 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1204 written polling loops from denying visibility of updates to memory. 1205 1206config ARM_ERRATA_364296 1207 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1208 depends on CPU_V6 1209 help 1210 This options enables the workaround for the 364296 ARM1136 1211 r0p2 erratum (possible cache data corruption with 1212 hit-under-miss enabled). It sets the undocumented bit 31 in 1213 the auxiliary control register and the FI bit in the control 1214 register, thus disabling hit-under-miss without putting the 1215 processor into full low interrupt latency mode. ARM11MPCore 1216 is not affected. 1217 1218config ARM_ERRATA_764369 1219 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1220 depends on CPU_V7 && SMP 1221 help 1222 This option enables the workaround for erratum 764369 1223 affecting Cortex-A9 MPCore with two or more processors (all 1224 current revisions). Under certain timing circumstances, a data 1225 cache line maintenance operation by MVA targeting an Inner 1226 Shareable memory region may fail to proceed up to either the 1227 Point of Coherency or to the Point of Unification of the 1228 system. This workaround adds a DSB instruction before the 1229 relevant cache maintenance functions and sets a specific bit 1230 in the diagnostic control register of the SCU. 1231 1232config ARM_ERRATA_775420 1233 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1234 depends on CPU_V7 1235 help 1236 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1237 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1238 operation aborts with MMU exception, it might cause the processor 1239 to deadlock. This workaround puts DSB before executing ISB if 1240 an abort may occur on cache maintenance. 1241 1242config ARM_ERRATA_798181 1243 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1244 depends on CPU_V7 && SMP 1245 help 1246 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1247 adequately shooting down all use of the old entries. This 1248 option enables the Linux kernel workaround for this erratum 1249 which sends an IPI to the CPUs that are running the same ASID 1250 as the one being invalidated. 1251 1252config ARM_ERRATA_773022 1253 bool "ARM errata: incorrect instructions may be executed from loop buffer" 1254 depends on CPU_V7 1255 help 1256 This option enables the workaround for the 773022 Cortex-A15 1257 (up to r0p4) erratum. In certain rare sequences of code, the 1258 loop buffer may deliver incorrect instructions. This 1259 workaround disables the loop buffer to avoid the erratum. 1260 1261endmenu 1262 1263source "arch/arm/common/Kconfig" 1264 1265menu "Bus support" 1266 1267config ISA 1268 bool 1269 help 1270 Find out whether you have ISA slots on your motherboard. ISA is the 1271 name of a bus system, i.e. the way the CPU talks to the other stuff 1272 inside your box. Other bus systems are PCI, EISA, MicroChannel 1273 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1274 newer boards don't support it. If you have ISA, say Y, otherwise N. 1275 1276# Select ISA DMA controller support 1277config ISA_DMA 1278 bool 1279 select ISA_DMA_API 1280 1281# Select ISA DMA interface 1282config ISA_DMA_API 1283 bool 1284 1285config PCI 1286 bool "PCI support" if MIGHT_HAVE_PCI 1287 help 1288 Find out whether you have a PCI motherboard. PCI is the name of a 1289 bus system, i.e. the way the CPU talks to the other stuff inside 1290 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1291 VESA. If you have PCI, say Y, otherwise N. 1292 1293config PCI_DOMAINS 1294 bool 1295 depends on PCI 1296 1297config PCI_DOMAINS_GENERIC 1298 def_bool PCI_DOMAINS 1299 1300config PCI_NANOENGINE 1301 bool "BSE nanoEngine PCI support" 1302 depends on SA1100_NANOENGINE 1303 help 1304 Enable PCI on the BSE nanoEngine board. 1305 1306config PCI_SYSCALL 1307 def_bool PCI 1308 1309config PCI_HOST_ITE8152 1310 bool 1311 depends on PCI && MACH_ARMCORE 1312 default y 1313 select DMABOUNCE 1314 1315source "drivers/pci/Kconfig" 1316source "drivers/pci/pcie/Kconfig" 1317 1318source "drivers/pcmcia/Kconfig" 1319 1320endmenu 1321 1322menu "Kernel Features" 1323 1324config HAVE_SMP 1325 bool 1326 help 1327 This option should be selected by machines which have an SMP- 1328 capable CPU. 1329 1330 The only effect of this option is to make the SMP-related 1331 options available to the user for configuration. 1332 1333config SMP 1334 bool "Symmetric Multi-Processing" 1335 depends on CPU_V6K || CPU_V7 1336 depends on GENERIC_CLOCKEVENTS 1337 depends on HAVE_SMP 1338 depends on MMU || ARM_MPU 1339 select IRQ_WORK 1340 help 1341 This enables support for systems with more than one CPU. If you have 1342 a system with only one CPU, say N. If you have a system with more 1343 than one CPU, say Y. 1344 1345 If you say N here, the kernel will run on uni- and multiprocessor 1346 machines, but will use only one CPU of a multiprocessor machine. If 1347 you say Y here, the kernel will run on many, but not all, 1348 uniprocessor machines. On a uniprocessor machine, the kernel 1349 will run faster if you say N here. 1350 1351 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1352 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1353 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1354 1355 If you don't know what to do here, say N. 1356 1357config SMP_ON_UP 1358 bool "Allow booting SMP kernel on uniprocessor systems" 1359 depends on SMP && !XIP_KERNEL && MMU 1360 default y 1361 help 1362 SMP kernels contain instructions which fail on non-SMP processors. 1363 Enabling this option allows the kernel to modify itself to make 1364 these instructions safe. Disabling it allows about 1K of space 1365 savings. 1366 1367 If you don't know what to do here, say Y. 1368 1369config ARM_CPU_TOPOLOGY 1370 bool "Support cpu topology definition" 1371 depends on SMP && CPU_V7 1372 default y 1373 help 1374 Support ARM cpu topology definition. The MPIDR register defines 1375 affinity between processors which is then used to describe the cpu 1376 topology of an ARM System. 1377 1378config SCHED_MC 1379 bool "Multi-core scheduler support" 1380 depends on ARM_CPU_TOPOLOGY 1381 help 1382 Multi-core scheduler support improves the CPU scheduler's decision 1383 making when dealing with multi-core CPU chips at a cost of slightly 1384 increased overhead in some places. If unsure say N here. 1385 1386config SCHED_SMT 1387 bool "SMT scheduler support" 1388 depends on ARM_CPU_TOPOLOGY 1389 help 1390 Improves the CPU scheduler's decision making when dealing with 1391 MultiThreading at a cost of slightly increased overhead in some 1392 places. If unsure say N here. 1393 1394config HAVE_ARM_SCU 1395 bool 1396 help 1397 This option enables support for the ARM system coherency unit 1398 1399config HAVE_ARM_ARCH_TIMER 1400 bool "Architected timer support" 1401 depends on CPU_V7 1402 select ARM_ARCH_TIMER 1403 select GENERIC_CLOCKEVENTS 1404 help 1405 This option enables support for the ARM architected timer 1406 1407config HAVE_ARM_TWD 1408 bool 1409 depends on SMP 1410 select CLKSRC_OF if OF 1411 help 1412 This options enables support for the ARM timer and watchdog unit 1413 1414config MCPM 1415 bool "Multi-Cluster Power Management" 1416 depends on CPU_V7 && SMP 1417 help 1418 This option provides the common power management infrastructure 1419 for (multi-)cluster based systems, such as big.LITTLE based 1420 systems. 1421 1422config MCPM_QUAD_CLUSTER 1423 bool 1424 depends on MCPM 1425 help 1426 To avoid wasting resources unnecessarily, MCPM only supports up 1427 to 2 clusters by default. 1428 Platforms with 3 or 4 clusters that use MCPM must select this 1429 option to allow the additional clusters to be managed. 1430 1431config BIG_LITTLE 1432 bool "big.LITTLE support (Experimental)" 1433 depends on CPU_V7 && SMP 1434 select MCPM 1435 help 1436 This option enables support selections for the big.LITTLE 1437 system architecture. 1438 1439config BL_SWITCHER 1440 bool "big.LITTLE switcher support" 1441 depends on BIG_LITTLE && MCPM && HOTPLUG_CPU 1442 select ARM_CPU_SUSPEND 1443 select CPU_PM 1444 help 1445 The big.LITTLE "switcher" provides the core functionality to 1446 transparently handle transition between a cluster of A15's 1447 and a cluster of A7's in a big.LITTLE system. 1448 1449config BL_SWITCHER_DUMMY_IF 1450 tristate "Simple big.LITTLE switcher user interface" 1451 depends on BL_SWITCHER && DEBUG_KERNEL 1452 help 1453 This is a simple and dummy char dev interface to control 1454 the big.LITTLE switcher core code. It is meant for 1455 debugging purposes only. 1456 1457choice 1458 prompt "Memory split" 1459 depends on MMU 1460 default VMSPLIT_3G 1461 help 1462 Select the desired split between kernel and user memory. 1463 1464 If you are not absolutely sure what you are doing, leave this 1465 option alone! 1466 1467 config VMSPLIT_3G 1468 bool "3G/1G user/kernel split" 1469 config VMSPLIT_2G 1470 bool "2G/2G user/kernel split" 1471 config VMSPLIT_1G 1472 bool "1G/3G user/kernel split" 1473endchoice 1474 1475config PAGE_OFFSET 1476 hex 1477 default PHYS_OFFSET if !MMU 1478 default 0x40000000 if VMSPLIT_1G 1479 default 0x80000000 if VMSPLIT_2G 1480 default 0xC0000000 1481 1482config NR_CPUS 1483 int "Maximum number of CPUs (2-32)" 1484 range 2 32 1485 depends on SMP 1486 default "4" 1487 1488config HOTPLUG_CPU 1489 bool "Support for hot-pluggable CPUs" 1490 depends on SMP 1491 help 1492 Say Y here to experiment with turning CPUs off and on. CPUs 1493 can be controlled through /sys/devices/system/cpu. 1494 1495config ARM_PSCI 1496 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1497 depends on CPU_V7 1498 help 1499 Say Y here if you want Linux to communicate with system firmware 1500 implementing the PSCI specification for CPU-centric power 1501 management operations described in ARM document number ARM DEN 1502 0022A ("Power State Coordination Interface System Software on 1503 ARM processors"). 1504 1505# The GPIO number here must be sorted by descending number. In case of 1506# a multiplatform kernel, we just want the highest value required by the 1507# selected platforms. 1508config ARCH_NR_GPIO 1509 int 1510 default 1024 if ARCH_BRCMSTB || ARCH_SHMOBILE || ARCH_TEGRA || \ 1511 ARCH_ZYNQ 1512 default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ 1513 SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 1514 default 416 if ARCH_SUNXI 1515 default 392 if ARCH_U8500 1516 default 352 if ARCH_VT8500 1517 default 288 if ARCH_ROCKCHIP 1518 default 264 if MACH_H4700 1519 default 0 1520 help 1521 Maximum number of GPIOs in the system. 1522 1523 If unsure, leave the default value. 1524 1525source kernel/Kconfig.preempt 1526 1527config HZ_FIXED 1528 int 1529 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \ 1530 ARCH_S5PV210 || ARCH_EXYNOS4 1531 default 128 if SOC_AT91RM9200 1532 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY 1533 default 0 1534 1535choice 1536 depends on HZ_FIXED = 0 1537 prompt "Timer frequency" 1538 1539config HZ_100 1540 bool "100 Hz" 1541 1542config HZ_200 1543 bool "200 Hz" 1544 1545config HZ_250 1546 bool "250 Hz" 1547 1548config HZ_300 1549 bool "300 Hz" 1550 1551config HZ_500 1552 bool "500 Hz" 1553 1554config HZ_1000 1555 bool "1000 Hz" 1556 1557endchoice 1558 1559config HZ 1560 int 1561 default HZ_FIXED if HZ_FIXED != 0 1562 default 100 if HZ_100 1563 default 200 if HZ_200 1564 default 250 if HZ_250 1565 default 300 if HZ_300 1566 default 500 if HZ_500 1567 default 1000 1568 1569config SCHED_HRTICK 1570 def_bool HIGH_RES_TIMERS 1571 1572config THUMB2_KERNEL 1573 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1574 depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K 1575 default y if CPU_THUMBONLY 1576 select AEABI 1577 select ARM_ASM_UNIFIED 1578 select ARM_UNWIND 1579 help 1580 By enabling this option, the kernel will be compiled in 1581 Thumb-2 mode. A compiler/assembler that understand the unified 1582 ARM-Thumb syntax is needed. 1583 1584 If unsure, say N. 1585 1586config THUMB2_AVOID_R_ARM_THM_JUMP11 1587 bool "Work around buggy Thumb-2 short branch relocations in gas" 1588 depends on THUMB2_KERNEL && MODULES 1589 default y 1590 help 1591 Various binutils versions can resolve Thumb-2 branches to 1592 locally-defined, preemptible global symbols as short-range "b.n" 1593 branch instructions. 1594 1595 This is a problem, because there's no guarantee the final 1596 destination of the symbol, or any candidate locations for a 1597 trampoline, are within range of the branch. For this reason, the 1598 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1599 relocation in modules at all, and it makes little sense to add 1600 support. 1601 1602 The symptom is that the kernel fails with an "unsupported 1603 relocation" error when loading some modules. 1604 1605 Until fixed tools are available, passing 1606 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1607 code which hits this problem, at the cost of a bit of extra runtime 1608 stack usage in some cases. 1609 1610 The problem is described in more detail at: 1611 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1612 1613 Only Thumb-2 kernels are affected. 1614 1615 Unless you are sure your tools don't have this problem, say Y. 1616 1617config ARM_ASM_UNIFIED 1618 bool 1619 1620config AEABI 1621 bool "Use the ARM EABI to compile the kernel" 1622 help 1623 This option allows for the kernel to be compiled using the latest 1624 ARM ABI (aka EABI). This is only useful if you are using a user 1625 space environment that is also compiled with EABI. 1626 1627 Since there are major incompatibilities between the legacy ABI and 1628 EABI, especially with regard to structure member alignment, this 1629 option also changes the kernel syscall calling convention to 1630 disambiguate both ABIs and allow for backward compatibility support 1631 (selected with CONFIG_OABI_COMPAT). 1632 1633 To use this you need GCC version 4.0.0 or later. 1634 1635config OABI_COMPAT 1636 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1637 depends on AEABI && !THUMB2_KERNEL 1638 help 1639 This option preserves the old syscall interface along with the 1640 new (ARM EABI) one. It also provides a compatibility layer to 1641 intercept syscalls that have structure arguments which layout 1642 in memory differs between the legacy ABI and the new ARM EABI 1643 (only for non "thumb" binaries). This option adds a tiny 1644 overhead to all syscalls and produces a slightly larger kernel. 1645 1646 The seccomp filter system will not be available when this is 1647 selected, since there is no way yet to sensibly distinguish 1648 between calling conventions during filtering. 1649 1650 If you know you'll be using only pure EABI user space then you 1651 can say N here. If this option is not selected and you attempt 1652 to execute a legacy ABI binary then the result will be 1653 UNPREDICTABLE (in fact it can be predicted that it won't work 1654 at all). If in doubt say N. 1655 1656config ARCH_HAS_HOLES_MEMORYMODEL 1657 bool 1658 1659config ARCH_SPARSEMEM_ENABLE 1660 bool 1661 1662config ARCH_SPARSEMEM_DEFAULT 1663 def_bool ARCH_SPARSEMEM_ENABLE 1664 1665config ARCH_SELECT_MEMORY_MODEL 1666 def_bool ARCH_SPARSEMEM_ENABLE 1667 1668config HAVE_ARCH_PFN_VALID 1669 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1670 1671config HAVE_GENERIC_RCU_GUP 1672 def_bool y 1673 depends on ARM_LPAE 1674 1675config HIGHMEM 1676 bool "High Memory Support" 1677 depends on MMU 1678 help 1679 The address space of ARM processors is only 4 Gigabytes large 1680 and it has to accommodate user address space, kernel address 1681 space as well as some memory mapped IO. That means that, if you 1682 have a large amount of physical memory and/or IO, not all of the 1683 memory can be "permanently mapped" by the kernel. The physical 1684 memory that is not permanently mapped is called "high memory". 1685 1686 Depending on the selected kernel/user memory split, minimum 1687 vmalloc space and actual amount of RAM, you may not need this 1688 option which should result in a slightly faster kernel. 1689 1690 If unsure, say n. 1691 1692config HIGHPTE 1693 bool "Allocate 2nd-level pagetables from highmem" 1694 depends on HIGHMEM 1695 help 1696 The VM uses one page of physical memory for each page table. 1697 For systems with a lot of processes, this can use a lot of 1698 precious low memory, eventually leading to low memory being 1699 consumed by page tables. Setting this option will allow 1700 user-space 2nd level page tables to reside in high memory. 1701 1702config HW_PERF_EVENTS 1703 bool "Enable hardware performance counter support for perf events" 1704 depends on PERF_EVENTS 1705 default y 1706 help 1707 Enable hardware performance counter support for perf events. If 1708 disabled, perf events will use software events only. 1709 1710config SYS_SUPPORTS_HUGETLBFS 1711 def_bool y 1712 depends on ARM_LPAE 1713 1714config HAVE_ARCH_TRANSPARENT_HUGEPAGE 1715 def_bool y 1716 depends on ARM_LPAE 1717 1718config ARCH_WANT_GENERAL_HUGETLB 1719 def_bool y 1720 1721config ARM_MODULE_PLTS 1722 bool "Use PLTs to allow module memory to spill over into vmalloc area" 1723 depends on MODULES 1724 help 1725 Allocate PLTs when loading modules so that jumps and calls whose 1726 targets are too far away for their relative offsets to be encoded 1727 in the instructions themselves can be bounced via veneers in the 1728 module's PLT. This allows modules to be allocated in the generic 1729 vmalloc area after the dedicated module memory area has been 1730 exhausted. The modules will use slightly more memory, but after 1731 rounding up to page size, the actual memory footprint is usually 1732 the same. 1733 1734 Say y if you are getting out of memory errors while loading modules 1735 1736source "mm/Kconfig" 1737 1738config FORCE_MAX_ZONEORDER 1739 int "Maximum zone order" if ARCH_SHMOBILE_LEGACY 1740 range 11 64 if ARCH_SHMOBILE_LEGACY 1741 default "12" if SOC_AM33XX 1742 default "9" if SA1111 || ARCH_EFM32 1743 default "11" 1744 help 1745 The kernel memory allocator divides physically contiguous memory 1746 blocks into "zones", where each zone is a power of two number of 1747 pages. This option selects the largest power of two that the kernel 1748 keeps in the memory allocator. If you need to allocate very large 1749 blocks of physically contiguous memory, then you may need to 1750 increase this value. 1751 1752 This config option is actually maximum order plus one. For example, 1753 a value of 11 means that the largest free memory block is 2^10 pages. 1754 1755config ALIGNMENT_TRAP 1756 bool 1757 depends on CPU_CP15_MMU 1758 default y if !ARCH_EBSA110 1759 select HAVE_PROC_CPU if PROC_FS 1760 help 1761 ARM processors cannot fetch/store information which is not 1762 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1763 address divisible by 4. On 32-bit ARM processors, these non-aligned 1764 fetch/store instructions will be emulated in software if you say 1765 here, which has a severe performance impact. This is necessary for 1766 correct operation of some network protocols. With an IP-only 1767 configuration it is safe to say N, otherwise say Y. 1768 1769config UACCESS_WITH_MEMCPY 1770 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1771 depends on MMU 1772 default y if CPU_FEROCEON 1773 help 1774 Implement faster copy_to_user and clear_user methods for CPU 1775 cores where a 8-word STM instruction give significantly higher 1776 memory write throughput than a sequence of individual 32bit stores. 1777 1778 A possible side effect is a slight increase in scheduling latency 1779 between threads sharing the same address space if they invoke 1780 such copy operations with large buffers. 1781 1782 However, if the CPU data cache is using a write-allocate mode, 1783 this option is unlikely to provide any performance gain. 1784 1785config SECCOMP 1786 bool 1787 prompt "Enable seccomp to safely compute untrusted bytecode" 1788 ---help--- 1789 This kernel feature is useful for number crunching applications 1790 that may need to compute untrusted bytecode during their 1791 execution. By using pipes or other transports made available to 1792 the process as file descriptors supporting the read/write 1793 syscalls, it's possible to isolate those applications in 1794 their own address space using seccomp. Once seccomp is 1795 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1796 and the task is only allowed to execute a few safe syscalls 1797 defined by each seccomp mode. 1798 1799config SWIOTLB 1800 def_bool y 1801 1802config IOMMU_HELPER 1803 def_bool SWIOTLB 1804 1805config XEN_DOM0 1806 def_bool y 1807 depends on XEN 1808 1809config XEN 1810 bool "Xen guest support on ARM" 1811 depends on ARM && AEABI && OF 1812 depends on CPU_V7 && !CPU_V6 1813 depends on !GENERIC_ATOMIC64 1814 depends on MMU 1815 select ARCH_DMA_ADDR_T_64BIT 1816 select ARM_PSCI 1817 select SWIOTLB_XEN 1818 help 1819 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1820 1821endmenu 1822 1823menu "Boot options" 1824 1825config USE_OF 1826 bool "Flattened Device Tree support" 1827 select IRQ_DOMAIN 1828 select OF 1829 select OF_EARLY_FLATTREE 1830 select OF_RESERVED_MEM 1831 help 1832 Include support for flattened device tree machine descriptions. 1833 1834config ATAGS 1835 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1836 default y 1837 help 1838 This is the traditional way of passing data to the kernel at boot 1839 time. If you are solely relying on the flattened device tree (or 1840 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1841 to remove ATAGS support from your kernel binary. If unsure, 1842 leave this to y. 1843 1844config DEPRECATED_PARAM_STRUCT 1845 bool "Provide old way to pass kernel parameters" 1846 depends on ATAGS 1847 help 1848 This was deprecated in 2001 and announced to live on for 5 years. 1849 Some old boot loaders still use this way. 1850 1851# Compressed boot loader in ROM. Yes, we really want to ask about 1852# TEXT and BSS so we preserve their values in the config files. 1853config ZBOOT_ROM_TEXT 1854 hex "Compressed ROM boot loader base address" 1855 default "0" 1856 help 1857 The physical address at which the ROM-able zImage is to be 1858 placed in the target. Platforms which normally make use of 1859 ROM-able zImage formats normally set this to a suitable 1860 value in their defconfig file. 1861 1862 If ZBOOT_ROM is not enabled, this has no effect. 1863 1864config ZBOOT_ROM_BSS 1865 hex "Compressed ROM boot loader BSS address" 1866 default "0" 1867 help 1868 The base address of an area of read/write memory in the target 1869 for the ROM-able zImage which must be available while the 1870 decompressor is running. It must be large enough to hold the 1871 entire decompressed kernel plus an additional 128 KiB. 1872 Platforms which normally make use of ROM-able zImage formats 1873 normally set this to a suitable value in their defconfig file. 1874 1875 If ZBOOT_ROM is not enabled, this has no effect. 1876 1877config ZBOOT_ROM 1878 bool "Compressed boot loader in ROM/flash" 1879 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1880 depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR 1881 help 1882 Say Y here if you intend to execute your compressed kernel image 1883 (zImage) directly from ROM or flash. If unsure, say N. 1884 1885config ARM_APPENDED_DTB 1886 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1887 depends on OF 1888 help 1889 With this option, the boot code will look for a device tree binary 1890 (DTB) appended to zImage 1891 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1892 1893 This is meant as a backward compatibility convenience for those 1894 systems with a bootloader that can't be upgraded to accommodate 1895 the documented boot protocol using a device tree. 1896 1897 Beware that there is very little in terms of protection against 1898 this option being confused by leftover garbage in memory that might 1899 look like a DTB header after a reboot if no actual DTB is appended 1900 to zImage. Do not leave this option active in a production kernel 1901 if you don't intend to always append a DTB. Proper passing of the 1902 location into r2 of a bootloader provided DTB is always preferable 1903 to this option. 1904 1905config ARM_ATAG_DTB_COMPAT 1906 bool "Supplement the appended DTB with traditional ATAG information" 1907 depends on ARM_APPENDED_DTB 1908 help 1909 Some old bootloaders can't be updated to a DTB capable one, yet 1910 they provide ATAGs with memory configuration, the ramdisk address, 1911 the kernel cmdline string, etc. Such information is dynamically 1912 provided by the bootloader and can't always be stored in a static 1913 DTB. To allow a device tree enabled kernel to be used with such 1914 bootloaders, this option allows zImage to extract the information 1915 from the ATAG list and store it at run time into the appended DTB. 1916 1917choice 1918 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1919 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1920 1921config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1922 bool "Use bootloader kernel arguments if available" 1923 help 1924 Uses the command-line options passed by the boot loader instead of 1925 the device tree bootargs property. If the boot loader doesn't provide 1926 any, the device tree bootargs property will be used. 1927 1928config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1929 bool "Extend with bootloader kernel arguments" 1930 help 1931 The command-line arguments provided by the boot loader will be 1932 appended to the the device tree bootargs property. 1933 1934endchoice 1935 1936config CMDLINE 1937 string "Default kernel command string" 1938 default "" 1939 help 1940 On some architectures (EBSA110 and CATS), there is currently no way 1941 for the boot loader to pass arguments to the kernel. For these 1942 architectures, you should supply some command-line options at build 1943 time by entering them here. As a minimum, you should specify the 1944 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1945 1946choice 1947 prompt "Kernel command line type" if CMDLINE != "" 1948 default CMDLINE_FROM_BOOTLOADER 1949 depends on ATAGS 1950 1951config CMDLINE_FROM_BOOTLOADER 1952 bool "Use bootloader kernel arguments if available" 1953 help 1954 Uses the command-line options passed by the boot loader. If 1955 the boot loader doesn't provide any, the default kernel command 1956 string provided in CMDLINE will be used. 1957 1958config CMDLINE_EXTEND 1959 bool "Extend bootloader kernel arguments" 1960 help 1961 The command-line arguments provided by the boot loader will be 1962 appended to the default kernel command string. 1963 1964config CMDLINE_FORCE 1965 bool "Always use the default kernel command string" 1966 help 1967 Always use the default kernel command string, even if the boot 1968 loader passes other arguments to the kernel. 1969 This is useful if you cannot or don't want to change the 1970 command-line options your boot loader passes to the kernel. 1971endchoice 1972 1973config XIP_KERNEL 1974 bool "Kernel Execute-In-Place from ROM" 1975 depends on !ARM_LPAE && !ARCH_MULTIPLATFORM 1976 help 1977 Execute-In-Place allows the kernel to run from non-volatile storage 1978 directly addressable by the CPU, such as NOR flash. This saves RAM 1979 space since the text section of the kernel is not loaded from flash 1980 to RAM. Read-write sections, such as the data section and stack, 1981 are still copied to RAM. The XIP kernel is not compressed since 1982 it has to run directly from flash, so it will take more space to 1983 store it. The flash address used to link the kernel object files, 1984 and for storing it, is configuration dependent. Therefore, if you 1985 say Y here, you must know the proper physical address where to 1986 store the kernel image depending on your own flash memory usage. 1987 1988 Also note that the make target becomes "make xipImage" rather than 1989 "make zImage" or "make Image". The final kernel binary to put in 1990 ROM memory will be arch/arm/boot/xipImage. 1991 1992 If unsure, say N. 1993 1994config XIP_PHYS_ADDR 1995 hex "XIP Kernel Physical Location" 1996 depends on XIP_KERNEL 1997 default "0x00080000" 1998 help 1999 This is the physical address in your flash memory the kernel will 2000 be linked for and stored to. This address is dependent on your 2001 own flash usage. 2002 2003config KEXEC 2004 bool "Kexec system call (EXPERIMENTAL)" 2005 depends on (!SMP || PM_SLEEP_SMP) 2006 depends on !CPU_V7M 2007 help 2008 kexec is a system call that implements the ability to shutdown your 2009 current kernel, and to start another kernel. It is like a reboot 2010 but it is independent of the system firmware. And like a reboot 2011 you can start any kernel with it, not just Linux. 2012 2013 It is an ongoing process to be certain the hardware in a machine 2014 is properly shutdown, so do not be surprised if this code does not 2015 initially work for you. 2016 2017config ATAGS_PROC 2018 bool "Export atags in procfs" 2019 depends on ATAGS && KEXEC 2020 default y 2021 help 2022 Should the atags used to boot the kernel be exported in an "atags" 2023 file in procfs. Useful with kexec. 2024 2025config CRASH_DUMP 2026 bool "Build kdump crash kernel (EXPERIMENTAL)" 2027 help 2028 Generate crash dump after being started by kexec. This should 2029 be normally only set in special crash dump kernels which are 2030 loaded in the main kernel with kexec-tools into a specially 2031 reserved region and then later executed after a crash by 2032 kdump/kexec. The crash dump kernel must be compiled to a 2033 memory address not used by the main kernel 2034 2035 For more details see Documentation/kdump/kdump.txt 2036 2037config AUTO_ZRELADDR 2038 bool "Auto calculation of the decompressed kernel image address" 2039 help 2040 ZRELADDR is the physical address where the decompressed kernel 2041 image will be placed. If AUTO_ZRELADDR is selected, the address 2042 will be determined at run-time by masking the current IP with 2043 0xf8000000. This assumes the zImage being placed in the first 128MB 2044 from start of memory. 2045 2046endmenu 2047 2048menu "CPU Power Management" 2049 2050source "drivers/cpufreq/Kconfig" 2051 2052source "drivers/cpuidle/Kconfig" 2053 2054endmenu 2055 2056menu "Floating point emulation" 2057 2058comment "At least one emulation must be selected" 2059 2060config FPE_NWFPE 2061 bool "NWFPE math emulation" 2062 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2063 ---help--- 2064 Say Y to include the NWFPE floating point emulator in the kernel. 2065 This is necessary to run most binaries. Linux does not currently 2066 support floating point hardware so you need to say Y here even if 2067 your machine has an FPA or floating point co-processor podule. 2068 2069 You may say N here if you are going to load the Acorn FPEmulator 2070 early in the bootup. 2071 2072config FPE_NWFPE_XP 2073 bool "Support extended precision" 2074 depends on FPE_NWFPE 2075 help 2076 Say Y to include 80-bit support in the kernel floating-point 2077 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2078 Note that gcc does not generate 80-bit operations by default, 2079 so in most cases this option only enlarges the size of the 2080 floating point emulator without any good reason. 2081 2082 You almost surely want to say N here. 2083 2084config FPE_FASTFPE 2085 bool "FastFPE math emulation (EXPERIMENTAL)" 2086 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2087 ---help--- 2088 Say Y here to include the FAST floating point emulator in the kernel. 2089 This is an experimental much faster emulator which now also has full 2090 precision for the mantissa. It does not support any exceptions. 2091 It is very simple, and approximately 3-6 times faster than NWFPE. 2092 2093 It should be sufficient for most programs. It may be not suitable 2094 for scientific calculations, but you have to check this for yourself. 2095 If you do not feel you need a faster FP emulation you should better 2096 choose NWFPE. 2097 2098config VFP 2099 bool "VFP-format floating point maths" 2100 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2101 help 2102 Say Y to include VFP support code in the kernel. This is needed 2103 if your hardware includes a VFP unit. 2104 2105 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2106 release notes and additional status information. 2107 2108 Say N if your target does not have VFP hardware. 2109 2110config VFPv3 2111 bool 2112 depends on VFP 2113 default y if CPU_V7 2114 2115config NEON 2116 bool "Advanced SIMD (NEON) Extension support" 2117 depends on VFPv3 && CPU_V7 2118 help 2119 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2120 Extension. 2121 2122config KERNEL_MODE_NEON 2123 bool "Support for NEON in kernel mode" 2124 depends on NEON && AEABI 2125 help 2126 Say Y to include support for NEON in kernel mode. 2127 2128endmenu 2129 2130menu "Userspace binary formats" 2131 2132source "fs/Kconfig.binfmt" 2133 2134endmenu 2135 2136menu "Power management options" 2137 2138source "kernel/power/Kconfig" 2139 2140config ARCH_SUSPEND_POSSIBLE 2141 depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \ 2142 CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2143 def_bool y 2144 2145config ARM_CPU_SUSPEND 2146 def_bool PM_SLEEP 2147 2148config ARCH_HIBERNATION_POSSIBLE 2149 bool 2150 depends on MMU 2151 default y if ARCH_SUSPEND_POSSIBLE 2152 2153endmenu 2154 2155source "net/Kconfig" 2156 2157source "drivers/Kconfig" 2158 2159source "drivers/firmware/Kconfig" 2160 2161source "fs/Kconfig" 2162 2163source "arch/arm/Kconfig.debug" 2164 2165source "security/Kconfig" 2166 2167source "crypto/Kconfig" 2168if CRYPTO 2169source "arch/arm/crypto/Kconfig" 2170endif 2171 2172source "lib/Kconfig" 2173 2174source "arch/arm/kvm/Kconfig" 2175