1config ARM 2 bool 3 default y 4 select ARCH_BINFMT_ELF_RANDOMIZE_PIE 5 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 6 select ARCH_HAVE_CUSTOM_GPIO_H 7 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 8 select ARCH_WANT_IPC_PARSE_VERSION 9 select BUILDTIME_EXTABLE_SORT if MMU 10 select CPU_PM if (SUSPEND || CPU_IDLE) 11 select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU 12 select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI) 13 select GENERIC_CLOCKEVENTS_BROADCAST if SMP 14 select GENERIC_IRQ_PROBE 15 select GENERIC_IRQ_SHOW 16 select GENERIC_PCI_IOMAP 17 select GENERIC_SCHED_CLOCK 18 select GENERIC_SMP_IDLE_THREAD 19 select GENERIC_IDLE_POLL_SETUP 20 select GENERIC_STRNCPY_FROM_USER 21 select GENERIC_STRNLEN_USER 22 select HARDIRQS_SW_RESEND 23 select HAVE_AOUT 24 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 25 select HAVE_ARCH_KGDB 26 select HAVE_ARCH_SECCOMP_FILTER 27 select HAVE_ARCH_TRACEHOOK 28 select HAVE_BPF_JIT 29 select HAVE_C_RECORDMCOUNT 30 select HAVE_DEBUG_KMEMLEAK 31 select HAVE_DMA_API_DEBUG 32 select HAVE_DMA_ATTRS 33 select HAVE_DMA_CONTIGUOUS if MMU 34 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) 35 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL) 36 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL) 37 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL) 38 select HAVE_GENERIC_DMA_COHERENT 39 select HAVE_GENERIC_HARDIRQS 40 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)) 41 select HAVE_IDE if PCI || ISA || PCMCIA 42 select HAVE_IRQ_TIME_ACCOUNTING 43 select HAVE_KERNEL_GZIP 44 select HAVE_KERNEL_LZMA 45 select HAVE_KERNEL_LZO 46 select HAVE_KERNEL_XZ 47 select HAVE_KPROBES if !XIP_KERNEL 48 select HAVE_KRETPROBES if (HAVE_KPROBES) 49 select HAVE_MEMBLOCK 50 select HAVE_OPROFILE if (HAVE_PERF_EVENTS) 51 select HAVE_PERF_EVENTS 52 select HAVE_REGS_AND_STACK_ACCESS_API 53 select HAVE_SYSCALL_TRACEPOINTS 54 select HAVE_UID16 55 select KTIME_SCALAR 56 select PERF_USE_VMALLOC 57 select RTC_LIB 58 select SYS_SUPPORTS_APM_EMULATION 59 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND 60 select MODULES_USE_ELF_REL 61 select CLONE_BACKWARDS 62 select OLD_SIGSUSPEND3 63 select OLD_SIGACTION 64 select HAVE_CONTEXT_TRACKING 65 help 66 The ARM series is a line of low-power-consumption RISC chip designs 67 licensed by ARM Ltd and targeted at embedded applications and 68 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 69 manufactured, but legacy ARM-based PC hardware remains popular in 70 Europe. There is an ARM Linux project with a web page at 71 <http://www.arm.linux.org.uk/>. 72 73config ARM_HAS_SG_CHAIN 74 bool 75 76config NEED_SG_DMA_LENGTH 77 bool 78 79config ARM_DMA_USE_IOMMU 80 bool 81 select ARM_HAS_SG_CHAIN 82 select NEED_SG_DMA_LENGTH 83 84if ARM_DMA_USE_IOMMU 85 86config ARM_DMA_IOMMU_ALIGNMENT 87 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" 88 range 4 9 89 default 8 90 help 91 DMA mapping framework by default aligns all buffers to the smallest 92 PAGE_SIZE order which is greater than or equal to the requested buffer 93 size. This works well for buffers up to a few hundreds kilobytes, but 94 for larger buffers it just a waste of address space. Drivers which has 95 relatively small addressing window (like 64Mib) might run out of 96 virtual space with just a few allocations. 97 98 With this parameter you can specify the maximum PAGE_SIZE order for 99 DMA IOMMU buffers. Larger buffers will be aligned only to this 100 specified order. The order is expressed as a power of two multiplied 101 by the PAGE_SIZE. 102 103endif 104 105config HAVE_PWM 106 bool 107 108config MIGHT_HAVE_PCI 109 bool 110 111config SYS_SUPPORTS_APM_EMULATION 112 bool 113 114config HAVE_TCM 115 bool 116 select GENERIC_ALLOCATOR 117 118config HAVE_PROC_CPU 119 bool 120 121config NO_IOPORT 122 bool 123 124config EISA 125 bool 126 ---help--- 127 The Extended Industry Standard Architecture (EISA) bus was 128 developed as an open alternative to the IBM MicroChannel bus. 129 130 The EISA bus provided some of the features of the IBM MicroChannel 131 bus while maintaining backward compatibility with cards made for 132 the older ISA bus. The EISA bus saw limited use between 1988 and 133 1995 when it was made obsolete by the PCI bus. 134 135 Say Y here if you are building a kernel for an EISA-based machine. 136 137 Otherwise, say N. 138 139config SBUS 140 bool 141 142config STACKTRACE_SUPPORT 143 bool 144 default y 145 146config HAVE_LATENCYTOP_SUPPORT 147 bool 148 depends on !SMP 149 default y 150 151config LOCKDEP_SUPPORT 152 bool 153 default y 154 155config TRACE_IRQFLAGS_SUPPORT 156 bool 157 default y 158 159config RWSEM_GENERIC_SPINLOCK 160 bool 161 default y 162 163config RWSEM_XCHGADD_ALGORITHM 164 bool 165 166config ARCH_HAS_ILOG2_U32 167 bool 168 169config ARCH_HAS_ILOG2_U64 170 bool 171 172config ARCH_HAS_CPUFREQ 173 bool 174 help 175 Internal node to signify that the ARCH has CPUFREQ support 176 and that the relevant menu configurations are displayed for 177 it. 178 179config GENERIC_HWEIGHT 180 bool 181 default y 182 183config GENERIC_CALIBRATE_DELAY 184 bool 185 default y 186 187config ARCH_MAY_HAVE_PC_FDC 188 bool 189 190config ZONE_DMA 191 bool 192 193config NEED_DMA_MAP_STATE 194 def_bool y 195 196config ARCH_HAS_DMA_SET_COHERENT_MASK 197 bool 198 199config GENERIC_ISA_DMA 200 bool 201 202config FIQ 203 bool 204 205config NEED_RET_TO_USER 206 bool 207 208config ARCH_MTD_XIP 209 bool 210 211config VECTORS_BASE 212 hex 213 default 0xffff0000 if MMU || CPU_HIGH_VECTOR 214 default DRAM_BASE if REMAP_VECTORS_TO_RAM 215 default 0x00000000 216 help 217 The base address of exception vectors. 218 219config ARM_PATCH_PHYS_VIRT 220 bool "Patch physical to virtual translations at runtime" if EMBEDDED 221 default y 222 depends on !XIP_KERNEL && MMU 223 depends on !ARCH_REALVIEW || !SPARSEMEM 224 help 225 Patch phys-to-virt and virt-to-phys translation functions at 226 boot and module load time according to the position of the 227 kernel in system memory. 228 229 This can only be used with non-XIP MMU kernels where the base 230 of physical memory is at a 16MB boundary. 231 232 Only disable this option if you know that you do not require 233 this feature (eg, building a kernel for a single machine) and 234 you need to shrink the kernel to the minimal size. 235 236config NEED_MACH_GPIO_H 237 bool 238 help 239 Select this when mach/gpio.h is required to provide special 240 definitions for this platform. The need for mach/gpio.h should 241 be avoided when possible. 242 243config NEED_MACH_IO_H 244 bool 245 help 246 Select this when mach/io.h is required to provide special 247 definitions for this platform. The need for mach/io.h should 248 be avoided when possible. 249 250config NEED_MACH_MEMORY_H 251 bool 252 help 253 Select this when mach/memory.h is required to provide special 254 definitions for this platform. The need for mach/memory.h should 255 be avoided when possible. 256 257config PHYS_OFFSET 258 hex "Physical address of main memory" if MMU 259 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H 260 default DRAM_BASE if !MMU 261 help 262 Please provide the physical address corresponding to the 263 location of main memory in your system. 264 265config GENERIC_BUG 266 def_bool y 267 depends on BUG 268 269source "init/Kconfig" 270 271source "kernel/Kconfig.freezer" 272 273menu "System Type" 274 275config MMU 276 bool "MMU-based Paged Memory Management Support" 277 default y 278 help 279 Select if you want MMU-based virtualised addressing space 280 support by paged memory management. If unsure, say 'Y'. 281 282# 283# The "ARM system type" choice list is ordered alphabetically by option 284# text. Please add new entries in the option alphabetic order. 285# 286choice 287 prompt "ARM system type" 288 default ARCH_VERSATILE if !MMU 289 default ARCH_MULTIPLATFORM if MMU 290 291config ARCH_MULTIPLATFORM 292 bool "Allow multiple platforms to be selected" 293 depends on MMU 294 select ARM_PATCH_PHYS_VIRT 295 select AUTO_ZRELADDR 296 select COMMON_CLK 297 select MULTI_IRQ_HANDLER 298 select SPARSE_IRQ 299 select USE_OF 300 301config ARCH_INTEGRATOR 302 bool "ARM Ltd. Integrator family" 303 select ARCH_HAS_CPUFREQ 304 select ARM_AMBA 305 select COMMON_CLK 306 select COMMON_CLK_VERSATILE 307 select GENERIC_CLOCKEVENTS 308 select HAVE_TCM 309 select ICST 310 select MULTI_IRQ_HANDLER 311 select NEED_MACH_MEMORY_H 312 select PLAT_VERSATILE 313 select SPARSE_IRQ 314 select VERSATILE_FPGA_IRQ 315 help 316 Support for ARM's Integrator platform. 317 318config ARCH_REALVIEW 319 bool "ARM Ltd. RealView family" 320 select ARCH_WANT_OPTIONAL_GPIOLIB 321 select ARM_AMBA 322 select ARM_TIMER_SP804 323 select COMMON_CLK 324 select COMMON_CLK_VERSATILE 325 select GENERIC_CLOCKEVENTS 326 select GPIO_PL061 if GPIOLIB 327 select ICST 328 select NEED_MACH_MEMORY_H 329 select PLAT_VERSATILE 330 select PLAT_VERSATILE_CLCD 331 help 332 This enables support for ARM Ltd RealView boards. 333 334config ARCH_VERSATILE 335 bool "ARM Ltd. Versatile family" 336 select ARCH_WANT_OPTIONAL_GPIOLIB 337 select ARM_AMBA 338 select ARM_TIMER_SP804 339 select ARM_VIC 340 select CLKDEV_LOOKUP 341 select GENERIC_CLOCKEVENTS 342 select HAVE_MACH_CLKDEV 343 select ICST 344 select PLAT_VERSATILE 345 select PLAT_VERSATILE_CLCD 346 select PLAT_VERSATILE_CLOCK 347 select VERSATILE_FPGA_IRQ 348 help 349 This enables support for ARM Ltd Versatile board. 350 351config ARCH_AT91 352 bool "Atmel AT91" 353 select ARCH_REQUIRE_GPIOLIB 354 select CLKDEV_LOOKUP 355 select HAVE_CLK 356 select IRQ_DOMAIN 357 select NEED_MACH_GPIO_H 358 select NEED_MACH_IO_H if PCCARD 359 select PINCTRL 360 select PINCTRL_AT91 if USE_OF 361 help 362 This enables support for systems based on Atmel 363 AT91RM9200 and AT91SAM9* processors. 364 365config ARCH_CLPS711X 366 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based" 367 select ARCH_REQUIRE_GPIOLIB 368 select AUTO_ZRELADDR 369 select CLKDEV_LOOKUP 370 select COMMON_CLK 371 select CPU_ARM720T 372 select GENERIC_CLOCKEVENTS 373 select MULTI_IRQ_HANDLER 374 select NEED_MACH_MEMORY_H 375 select SPARSE_IRQ 376 help 377 Support for Cirrus Logic 711x/721x/731x based boards. 378 379config ARCH_GEMINI 380 bool "Cortina Systems Gemini" 381 select ARCH_REQUIRE_GPIOLIB 382 select ARCH_USES_GETTIMEOFFSET 383 select NEED_MACH_GPIO_H 384 select CPU_FA526 385 help 386 Support for the Cortina Systems Gemini family SoCs 387 388config ARCH_EBSA110 389 bool "EBSA-110" 390 select ARCH_USES_GETTIMEOFFSET 391 select CPU_SA110 392 select ISA 393 select NEED_MACH_IO_H 394 select NEED_MACH_MEMORY_H 395 select NO_IOPORT 396 help 397 This is an evaluation board for the StrongARM processor available 398 from Digital. It has limited hardware on-board, including an 399 Ethernet interface, two PCMCIA sockets, two serial ports and a 400 parallel port. 401 402config ARCH_EP93XX 403 bool "EP93xx-based" 404 select ARCH_HAS_HOLES_MEMORYMODEL 405 select ARCH_REQUIRE_GPIOLIB 406 select ARCH_USES_GETTIMEOFFSET 407 select ARM_AMBA 408 select ARM_VIC 409 select CLKDEV_LOOKUP 410 select CPU_ARM920T 411 select NEED_MACH_MEMORY_H 412 help 413 This enables support for the Cirrus EP93xx series of CPUs. 414 415config ARCH_FOOTBRIDGE 416 bool "FootBridge" 417 select CPU_SA110 418 select FOOTBRIDGE 419 select GENERIC_CLOCKEVENTS 420 select HAVE_IDE 421 select NEED_MACH_IO_H if !MMU 422 select NEED_MACH_MEMORY_H 423 help 424 Support for systems based on the DC21285 companion chip 425 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 426 427config ARCH_NETX 428 bool "Hilscher NetX based" 429 select ARM_VIC 430 select CLKSRC_MMIO 431 select CPU_ARM926T 432 select GENERIC_CLOCKEVENTS 433 help 434 This enables support for systems based on the Hilscher NetX Soc 435 436config ARCH_IOP13XX 437 bool "IOP13xx-based" 438 depends on MMU 439 select ARCH_SUPPORTS_MSI 440 select CPU_XSC3 441 select NEED_MACH_MEMORY_H 442 select NEED_RET_TO_USER 443 select PCI 444 select PLAT_IOP 445 select VMSPLIT_1G 446 help 447 Support for Intel's IOP13XX (XScale) family of processors. 448 449config ARCH_IOP32X 450 bool "IOP32x-based" 451 depends on MMU 452 select ARCH_REQUIRE_GPIOLIB 453 select CPU_XSCALE 454 select NEED_MACH_GPIO_H 455 select NEED_RET_TO_USER 456 select PCI 457 select PLAT_IOP 458 help 459 Support for Intel's 80219 and IOP32X (XScale) family of 460 processors. 461 462config ARCH_IOP33X 463 bool "IOP33x-based" 464 depends on MMU 465 select ARCH_REQUIRE_GPIOLIB 466 select CPU_XSCALE 467 select NEED_MACH_GPIO_H 468 select NEED_RET_TO_USER 469 select PCI 470 select PLAT_IOP 471 help 472 Support for Intel's IOP33X (XScale) family of processors. 473 474config ARCH_IXP4XX 475 bool "IXP4xx-based" 476 depends on MMU 477 select ARCH_HAS_DMA_SET_COHERENT_MASK 478 select ARCH_REQUIRE_GPIOLIB 479 select CLKSRC_MMIO 480 select CPU_XSCALE 481 select DMABOUNCE if PCI 482 select GENERIC_CLOCKEVENTS 483 select MIGHT_HAVE_PCI 484 select NEED_MACH_IO_H 485 select USB_EHCI_BIG_ENDIAN_MMIO 486 select USB_EHCI_BIG_ENDIAN_DESC 487 help 488 Support for Intel's IXP4XX (XScale) family of processors. 489 490config ARCH_DOVE 491 bool "Marvell Dove" 492 select ARCH_REQUIRE_GPIOLIB 493 select CPU_PJ4 494 select GENERIC_CLOCKEVENTS 495 select MIGHT_HAVE_PCI 496 select PINCTRL 497 select PINCTRL_DOVE 498 select PLAT_ORION_LEGACY 499 select USB_ARCH_HAS_EHCI 500 select MVEBU_MBUS 501 help 502 Support for the Marvell Dove SoC 88AP510 503 504config ARCH_KIRKWOOD 505 bool "Marvell Kirkwood" 506 select ARCH_REQUIRE_GPIOLIB 507 select CPU_FEROCEON 508 select GENERIC_CLOCKEVENTS 509 select PCI 510 select PCI_QUIRKS 511 select PINCTRL 512 select PINCTRL_KIRKWOOD 513 select PLAT_ORION_LEGACY 514 select MVEBU_MBUS 515 help 516 Support for the following Marvell Kirkwood series SoCs: 517 88F6180, 88F6192 and 88F6281. 518 519config ARCH_MV78XX0 520 bool "Marvell MV78xx0" 521 select ARCH_REQUIRE_GPIOLIB 522 select CPU_FEROCEON 523 select GENERIC_CLOCKEVENTS 524 select PCI 525 select PLAT_ORION_LEGACY 526 select MVEBU_MBUS 527 help 528 Support for the following Marvell MV78xx0 series SoCs: 529 MV781x0, MV782x0. 530 531config ARCH_ORION5X 532 bool "Marvell Orion" 533 depends on MMU 534 select ARCH_REQUIRE_GPIOLIB 535 select CPU_FEROCEON 536 select GENERIC_CLOCKEVENTS 537 select PCI 538 select PLAT_ORION_LEGACY 539 select MVEBU_MBUS 540 help 541 Support for the following Marvell Orion 5x series SoCs: 542 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 543 Orion-2 (5281), Orion-1-90 (6183). 544 545config ARCH_MMP 546 bool "Marvell PXA168/910/MMP2" 547 depends on MMU 548 select ARCH_REQUIRE_GPIOLIB 549 select CLKDEV_LOOKUP 550 select GENERIC_ALLOCATOR 551 select GENERIC_CLOCKEVENTS 552 select GPIO_PXA 553 select IRQ_DOMAIN 554 select NEED_MACH_GPIO_H 555 select PINCTRL 556 select PLAT_PXA 557 select SPARSE_IRQ 558 help 559 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 560 561config ARCH_KS8695 562 bool "Micrel/Kendin KS8695" 563 select ARCH_REQUIRE_GPIOLIB 564 select CLKSRC_MMIO 565 select CPU_ARM922T 566 select GENERIC_CLOCKEVENTS 567 select NEED_MACH_MEMORY_H 568 help 569 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 570 System-on-Chip devices. 571 572config ARCH_W90X900 573 bool "Nuvoton W90X900 CPU" 574 select ARCH_REQUIRE_GPIOLIB 575 select CLKDEV_LOOKUP 576 select CLKSRC_MMIO 577 select CPU_ARM926T 578 select GENERIC_CLOCKEVENTS 579 help 580 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 581 At present, the w90x900 has been renamed nuc900, regarding 582 the ARM series product line, you can login the following 583 link address to know more. 584 585 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 586 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 587 588config ARCH_LPC32XX 589 bool "NXP LPC32XX" 590 select ARCH_REQUIRE_GPIOLIB 591 select ARM_AMBA 592 select CLKDEV_LOOKUP 593 select CLKSRC_MMIO 594 select CPU_ARM926T 595 select GENERIC_CLOCKEVENTS 596 select HAVE_IDE 597 select HAVE_PWM 598 select USB_ARCH_HAS_OHCI 599 select USE_OF 600 help 601 Support for the NXP LPC32XX family of processors 602 603config ARCH_PXA 604 bool "PXA2xx/PXA3xx-based" 605 depends on MMU 606 select ARCH_HAS_CPUFREQ 607 select ARCH_MTD_XIP 608 select ARCH_REQUIRE_GPIOLIB 609 select ARM_CPU_SUSPEND if PM 610 select AUTO_ZRELADDR 611 select CLKDEV_LOOKUP 612 select CLKSRC_MMIO 613 select GENERIC_CLOCKEVENTS 614 select GPIO_PXA 615 select HAVE_IDE 616 select MULTI_IRQ_HANDLER 617 select NEED_MACH_GPIO_H 618 select PLAT_PXA 619 select SPARSE_IRQ 620 help 621 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 622 623config ARCH_MSM 624 bool "Qualcomm MSM" 625 select ARCH_REQUIRE_GPIOLIB 626 select CLKDEV_LOOKUP 627 select GENERIC_CLOCKEVENTS 628 select HAVE_CLK 629 help 630 Support for Qualcomm MSM/QSD based systems. This runs on the 631 apps processor of the MSM/QSD and depends on a shared memory 632 interface to the modem processor which runs the baseband 633 stack and controls some vital subsystems 634 (clock and power control, etc). 635 636config ARCH_SHMOBILE 637 bool "Renesas SH-Mobile / R-Mobile" 638 select CLKDEV_LOOKUP 639 select GENERIC_CLOCKEVENTS 640 select HAVE_ARM_SCU if SMP 641 select HAVE_ARM_TWD if LOCAL_TIMERS 642 select HAVE_CLK 643 select HAVE_MACH_CLKDEV 644 select HAVE_SMP 645 select MIGHT_HAVE_CACHE_L2X0 646 select MULTI_IRQ_HANDLER 647 select NEED_MACH_MEMORY_H 648 select NO_IOPORT 649 select PINCTRL if ARCH_WANT_OPTIONAL_GPIOLIB 650 select PM_GENERIC_DOMAINS if PM 651 select SPARSE_IRQ 652 help 653 Support for Renesas's SH-Mobile and R-Mobile ARM platforms. 654 655config ARCH_RPC 656 bool "RiscPC" 657 select ARCH_ACORN 658 select ARCH_MAY_HAVE_PC_FDC 659 select ARCH_SPARSEMEM_ENABLE 660 select ARCH_USES_GETTIMEOFFSET 661 select FIQ 662 select HAVE_IDE 663 select HAVE_PATA_PLATFORM 664 select ISA_DMA_API 665 select NEED_MACH_IO_H 666 select NEED_MACH_MEMORY_H 667 select NO_IOPORT 668 select VIRT_TO_BUS 669 help 670 On the Acorn Risc-PC, Linux can support the internal IDE disk and 671 CD-ROM interface, serial and parallel port, and the floppy drive. 672 673config ARCH_SA1100 674 bool "SA1100-based" 675 select ARCH_HAS_CPUFREQ 676 select ARCH_MTD_XIP 677 select ARCH_REQUIRE_GPIOLIB 678 select ARCH_SPARSEMEM_ENABLE 679 select CLKDEV_LOOKUP 680 select CLKSRC_MMIO 681 select CPU_FREQ 682 select CPU_SA1100 683 select GENERIC_CLOCKEVENTS 684 select HAVE_IDE 685 select ISA 686 select NEED_MACH_GPIO_H 687 select NEED_MACH_MEMORY_H 688 select SPARSE_IRQ 689 help 690 Support for StrongARM 11x0 based boards. 691 692config ARCH_S3C24XX 693 bool "Samsung S3C24XX SoCs" 694 select ARCH_HAS_CPUFREQ 695 select ARCH_REQUIRE_GPIOLIB 696 select CLKDEV_LOOKUP 697 select CLKSRC_MMIO 698 select GENERIC_CLOCKEVENTS 699 select HAVE_CLK 700 select HAVE_S3C2410_I2C if I2C 701 select HAVE_S3C2410_WATCHDOG if WATCHDOG 702 select HAVE_S3C_RTC if RTC_CLASS 703 select MULTI_IRQ_HANDLER 704 select NEED_MACH_GPIO_H 705 select NEED_MACH_IO_H 706 help 707 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 708 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 709 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 710 Samsung SMDK2410 development board (and derivatives). 711 712config ARCH_S3C64XX 713 bool "Samsung S3C64XX" 714 select ARCH_HAS_CPUFREQ 715 select ARCH_REQUIRE_GPIOLIB 716 select ARM_VIC 717 select CLKDEV_LOOKUP 718 select CLKSRC_MMIO 719 select CPU_V6 720 select GENERIC_CLOCKEVENTS 721 select HAVE_CLK 722 select HAVE_S3C2410_I2C if I2C 723 select HAVE_S3C2410_WATCHDOG if WATCHDOG 724 select HAVE_TCM 725 select NEED_MACH_GPIO_H 726 select NO_IOPORT 727 select PLAT_SAMSUNG 728 select S3C_DEV_NAND 729 select S3C_GPIO_TRACK 730 select SAMSUNG_CLKSRC 731 select SAMSUNG_GPIOLIB_4BIT 732 select SAMSUNG_IRQ_VIC_TIMER 733 select USB_ARCH_HAS_OHCI 734 help 735 Samsung S3C64XX series based systems 736 737config ARCH_S5P64X0 738 bool "Samsung S5P6440 S5P6450" 739 select CLKDEV_LOOKUP 740 select CLKSRC_MMIO 741 select CPU_V6 742 select GENERIC_CLOCKEVENTS 743 select HAVE_CLK 744 select HAVE_S3C2410_I2C if I2C 745 select HAVE_S3C2410_WATCHDOG if WATCHDOG 746 select HAVE_S3C_RTC if RTC_CLASS 747 select NEED_MACH_GPIO_H 748 help 749 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440, 750 SMDK6450. 751 752config ARCH_S5PC100 753 bool "Samsung S5PC100" 754 select ARCH_REQUIRE_GPIOLIB 755 select CLKDEV_LOOKUP 756 select CLKSRC_MMIO 757 select CPU_V7 758 select GENERIC_CLOCKEVENTS 759 select HAVE_CLK 760 select HAVE_S3C2410_I2C if I2C 761 select HAVE_S3C2410_WATCHDOG if WATCHDOG 762 select HAVE_S3C_RTC if RTC_CLASS 763 select NEED_MACH_GPIO_H 764 help 765 Samsung S5PC100 series based systems 766 767config ARCH_S5PV210 768 bool "Samsung S5PV210/S5PC110" 769 select ARCH_HAS_CPUFREQ 770 select ARCH_HAS_HOLES_MEMORYMODEL 771 select ARCH_SPARSEMEM_ENABLE 772 select CLKDEV_LOOKUP 773 select CLKSRC_MMIO 774 select CPU_V7 775 select GENERIC_CLOCKEVENTS 776 select HAVE_CLK 777 select HAVE_S3C2410_I2C if I2C 778 select HAVE_S3C2410_WATCHDOG if WATCHDOG 779 select HAVE_S3C_RTC if RTC_CLASS 780 select NEED_MACH_GPIO_H 781 select NEED_MACH_MEMORY_H 782 help 783 Samsung S5PV210/S5PC110 series based systems 784 785config ARCH_EXYNOS 786 bool "Samsung EXYNOS" 787 select ARCH_HAS_CPUFREQ 788 select ARCH_HAS_HOLES_MEMORYMODEL 789 select ARCH_SPARSEMEM_ENABLE 790 select CLKDEV_LOOKUP 791 select COMMON_CLK 792 select CPU_V7 793 select GENERIC_CLOCKEVENTS 794 select HAVE_CLK 795 select HAVE_S3C2410_I2C if I2C 796 select HAVE_S3C2410_WATCHDOG if WATCHDOG 797 select HAVE_S3C_RTC if RTC_CLASS 798 select NEED_MACH_GPIO_H 799 select NEED_MACH_MEMORY_H 800 help 801 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5) 802 803config ARCH_SHARK 804 bool "Shark" 805 select ARCH_USES_GETTIMEOFFSET 806 select CPU_SA110 807 select ISA 808 select ISA_DMA 809 select NEED_MACH_MEMORY_H 810 select PCI 811 select VIRT_TO_BUS 812 select ZONE_DMA 813 help 814 Support for the StrongARM based Digital DNARD machine, also known 815 as "Shark" (<http://www.shark-linux.de/shark.html>). 816 817config ARCH_U300 818 bool "ST-Ericsson U300 Series" 819 depends on MMU 820 select ARCH_REQUIRE_GPIOLIB 821 select ARM_AMBA 822 select ARM_PATCH_PHYS_VIRT 823 select ARM_VIC 824 select CLKDEV_LOOKUP 825 select CLKSRC_MMIO 826 select COMMON_CLK 827 select CPU_ARM926T 828 select GENERIC_CLOCKEVENTS 829 select HAVE_TCM 830 select SPARSE_IRQ 831 help 832 Support for ST-Ericsson U300 series mobile platforms. 833 834config ARCH_DAVINCI 835 bool "TI DaVinci" 836 select ARCH_HAS_HOLES_MEMORYMODEL 837 select ARCH_REQUIRE_GPIOLIB 838 select CLKDEV_LOOKUP 839 select GENERIC_ALLOCATOR 840 select GENERIC_CLOCKEVENTS 841 select GENERIC_IRQ_CHIP 842 select HAVE_IDE 843 select NEED_MACH_GPIO_H 844 select USE_OF 845 select ZONE_DMA 846 help 847 Support for TI's DaVinci platform. 848 849config ARCH_OMAP1 850 bool "TI OMAP1" 851 depends on MMU 852 select ARCH_HAS_CPUFREQ 853 select ARCH_HAS_HOLES_MEMORYMODEL 854 select ARCH_OMAP 855 select ARCH_REQUIRE_GPIOLIB 856 select CLKDEV_LOOKUP 857 select CLKSRC_MMIO 858 select GENERIC_CLOCKEVENTS 859 select GENERIC_IRQ_CHIP 860 select HAVE_CLK 861 select HAVE_IDE 862 select IRQ_DOMAIN 863 select NEED_MACH_IO_H if PCCARD 864 select NEED_MACH_MEMORY_H 865 help 866 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 867 868endchoice 869 870menu "Multiple platform selection" 871 depends on ARCH_MULTIPLATFORM 872 873comment "CPU Core family selection" 874 875config ARCH_MULTI_V4 876 bool "ARMv4 based platforms (FA526, StrongARM)" 877 depends on !ARCH_MULTI_V6_V7 878 select ARCH_MULTI_V4_V5 879 880config ARCH_MULTI_V4T 881 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 882 depends on !ARCH_MULTI_V6_V7 883 select ARCH_MULTI_V4_V5 884 885config ARCH_MULTI_V5 886 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 887 depends on !ARCH_MULTI_V6_V7 888 select ARCH_MULTI_V4_V5 889 890config ARCH_MULTI_V4_V5 891 bool 892 893config ARCH_MULTI_V6 894 bool "ARMv6 based platforms (ARM11)" 895 select ARCH_MULTI_V6_V7 896 select CPU_V6 897 898config ARCH_MULTI_V7 899 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 900 default y 901 select ARCH_MULTI_V6_V7 902 select CPU_V7 903 904config ARCH_MULTI_V6_V7 905 bool 906 907config ARCH_MULTI_CPU_AUTO 908 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 909 select ARCH_MULTI_V5 910 911endmenu 912 913# 914# This is sorted alphabetically by mach-* pathname. However, plat-* 915# Kconfigs may be included either alphabetically (according to the 916# plat- suffix) or along side the corresponding mach-* source. 917# 918source "arch/arm/mach-mvebu/Kconfig" 919 920source "arch/arm/mach-at91/Kconfig" 921 922source "arch/arm/mach-bcm/Kconfig" 923 924source "arch/arm/mach-bcm2835/Kconfig" 925 926source "arch/arm/mach-clps711x/Kconfig" 927 928source "arch/arm/mach-cns3xxx/Kconfig" 929 930source "arch/arm/mach-davinci/Kconfig" 931 932source "arch/arm/mach-dove/Kconfig" 933 934source "arch/arm/mach-ep93xx/Kconfig" 935 936source "arch/arm/mach-footbridge/Kconfig" 937 938source "arch/arm/mach-gemini/Kconfig" 939 940source "arch/arm/mach-highbank/Kconfig" 941 942source "arch/arm/mach-integrator/Kconfig" 943 944source "arch/arm/mach-iop32x/Kconfig" 945 946source "arch/arm/mach-iop33x/Kconfig" 947 948source "arch/arm/mach-iop13xx/Kconfig" 949 950source "arch/arm/mach-ixp4xx/Kconfig" 951 952source "arch/arm/mach-kirkwood/Kconfig" 953 954source "arch/arm/mach-ks8695/Kconfig" 955 956source "arch/arm/mach-msm/Kconfig" 957 958source "arch/arm/mach-mv78xx0/Kconfig" 959 960source "arch/arm/mach-imx/Kconfig" 961 962source "arch/arm/mach-mxs/Kconfig" 963 964source "arch/arm/mach-netx/Kconfig" 965 966source "arch/arm/mach-nomadik/Kconfig" 967 968source "arch/arm/plat-omap/Kconfig" 969 970source "arch/arm/mach-omap1/Kconfig" 971 972source "arch/arm/mach-omap2/Kconfig" 973 974source "arch/arm/mach-orion5x/Kconfig" 975 976source "arch/arm/mach-picoxcell/Kconfig" 977 978source "arch/arm/mach-pxa/Kconfig" 979source "arch/arm/plat-pxa/Kconfig" 980 981source "arch/arm/mach-mmp/Kconfig" 982 983source "arch/arm/mach-realview/Kconfig" 984 985source "arch/arm/mach-sa1100/Kconfig" 986 987source "arch/arm/plat-samsung/Kconfig" 988 989source "arch/arm/mach-socfpga/Kconfig" 990 991source "arch/arm/mach-spear/Kconfig" 992 993source "arch/arm/mach-s3c24xx/Kconfig" 994 995if ARCH_S3C64XX 996source "arch/arm/mach-s3c64xx/Kconfig" 997endif 998 999source "arch/arm/mach-s5p64x0/Kconfig" 1000 1001source "arch/arm/mach-s5pc100/Kconfig" 1002 1003source "arch/arm/mach-s5pv210/Kconfig" 1004 1005source "arch/arm/mach-exynos/Kconfig" 1006 1007source "arch/arm/mach-shmobile/Kconfig" 1008 1009source "arch/arm/mach-sunxi/Kconfig" 1010 1011source "arch/arm/mach-prima2/Kconfig" 1012 1013source "arch/arm/mach-tegra/Kconfig" 1014 1015source "arch/arm/mach-u300/Kconfig" 1016 1017source "arch/arm/mach-ux500/Kconfig" 1018 1019source "arch/arm/mach-versatile/Kconfig" 1020 1021source "arch/arm/mach-vexpress/Kconfig" 1022source "arch/arm/plat-versatile/Kconfig" 1023 1024source "arch/arm/mach-virt/Kconfig" 1025 1026source "arch/arm/mach-vt8500/Kconfig" 1027 1028source "arch/arm/mach-w90x900/Kconfig" 1029 1030source "arch/arm/mach-zynq/Kconfig" 1031 1032# Definitions to make life easier 1033config ARCH_ACORN 1034 bool 1035 1036config PLAT_IOP 1037 bool 1038 select GENERIC_CLOCKEVENTS 1039 1040config PLAT_ORION 1041 bool 1042 select CLKSRC_MMIO 1043 select COMMON_CLK 1044 select GENERIC_IRQ_CHIP 1045 select IRQ_DOMAIN 1046 1047config PLAT_ORION_LEGACY 1048 bool 1049 select PLAT_ORION 1050 1051config PLAT_PXA 1052 bool 1053 1054config PLAT_VERSATILE 1055 bool 1056 1057config ARM_TIMER_SP804 1058 bool 1059 select CLKSRC_MMIO 1060 select CLKSRC_OF if OF 1061 1062source arch/arm/mm/Kconfig 1063 1064config ARM_NR_BANKS 1065 int 1066 default 16 if ARCH_EP93XX 1067 default 8 1068 1069config IWMMXT 1070 bool "Enable iWMMXt support" if !CPU_PJ4 1071 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 1072 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 1073 help 1074 Enable support for iWMMXt context switching at run time if 1075 running on a CPU that supports it. 1076 1077config XSCALE_PMU 1078 bool 1079 depends on CPU_XSCALE 1080 default y 1081 1082config MULTI_IRQ_HANDLER 1083 bool 1084 help 1085 Allow each machine to specify it's own IRQ handler at run time. 1086 1087if !MMU 1088source "arch/arm/Kconfig-nommu" 1089endif 1090 1091config PJ4B_ERRATA_4742 1092 bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation" 1093 depends on CPU_PJ4B && MACH_ARMADA_370 1094 default y 1095 help 1096 When coming out of either a Wait for Interrupt (WFI) or a Wait for 1097 Event (WFE) IDLE states, a specific timing sensitivity exists between 1098 the retiring WFI/WFE instructions and the newly issued subsequent 1099 instructions. This sensitivity can result in a CPU hang scenario. 1100 Workaround: 1101 The software must insert either a Data Synchronization Barrier (DSB) 1102 or Data Memory Barrier (DMB) command immediately after the WFI/WFE 1103 instruction 1104 1105config ARM_ERRATA_326103 1106 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1107 depends on CPU_V6 1108 help 1109 Executing a SWP instruction to read-only memory does not set bit 11 1110 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1111 treat the access as a read, preventing a COW from occurring and 1112 causing the faulting task to livelock. 1113 1114config ARM_ERRATA_411920 1115 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1116 depends on CPU_V6 || CPU_V6K 1117 help 1118 Invalidation of the Instruction Cache operation can 1119 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1120 It does not affect the MPCore. This option enables the ARM Ltd. 1121 recommended workaround. 1122 1123config ARM_ERRATA_430973 1124 bool "ARM errata: Stale prediction on replaced interworking branch" 1125 depends on CPU_V7 1126 help 1127 This option enables the workaround for the 430973 Cortex-A8 1128 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb 1129 interworking branch is replaced with another code sequence at the 1130 same virtual address, whether due to self-modifying code or virtual 1131 to physical address re-mapping, Cortex-A8 does not recover from the 1132 stale interworking branch prediction. This results in Cortex-A8 1133 executing the new code sequence in the incorrect ARM or Thumb state. 1134 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1135 and also flushes the branch target cache at every context switch. 1136 Note that setting specific bits in the ACTLR register may not be 1137 available in non-secure mode. 1138 1139config ARM_ERRATA_458693 1140 bool "ARM errata: Processor deadlock when a false hazard is created" 1141 depends on CPU_V7 1142 depends on !ARCH_MULTIPLATFORM 1143 help 1144 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1145 erratum. For very specific sequences of memory operations, it is 1146 possible for a hazard condition intended for a cache line to instead 1147 be incorrectly associated with a different cache line. This false 1148 hazard might then cause a processor deadlock. The workaround enables 1149 the L1 caching of the NEON accesses and disables the PLD instruction 1150 in the ACTLR register. Note that setting specific bits in the ACTLR 1151 register may not be available in non-secure mode. 1152 1153config ARM_ERRATA_460075 1154 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1155 depends on CPU_V7 1156 depends on !ARCH_MULTIPLATFORM 1157 help 1158 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1159 erratum. Any asynchronous access to the L2 cache may encounter a 1160 situation in which recent store transactions to the L2 cache are lost 1161 and overwritten with stale memory contents from external memory. The 1162 workaround disables the write-allocate mode for the L2 cache via the 1163 ACTLR register. Note that setting specific bits in the ACTLR register 1164 may not be available in non-secure mode. 1165 1166config ARM_ERRATA_742230 1167 bool "ARM errata: DMB operation may be faulty" 1168 depends on CPU_V7 && SMP 1169 depends on !ARCH_MULTIPLATFORM 1170 help 1171 This option enables the workaround for the 742230 Cortex-A9 1172 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1173 between two write operations may not ensure the correct visibility 1174 ordering of the two writes. This workaround sets a specific bit in 1175 the diagnostic register of the Cortex-A9 which causes the DMB 1176 instruction to behave as a DSB, ensuring the correct behaviour of 1177 the two writes. 1178 1179config ARM_ERRATA_742231 1180 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1181 depends on CPU_V7 && SMP 1182 depends on !ARCH_MULTIPLATFORM 1183 help 1184 This option enables the workaround for the 742231 Cortex-A9 1185 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1186 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1187 accessing some data located in the same cache line, may get corrupted 1188 data due to bad handling of the address hazard when the line gets 1189 replaced from one of the CPUs at the same time as another CPU is 1190 accessing it. This workaround sets specific bits in the diagnostic 1191 register of the Cortex-A9 which reduces the linefill issuing 1192 capabilities of the processor. 1193 1194config PL310_ERRATA_588369 1195 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines" 1196 depends on CACHE_L2X0 1197 help 1198 The PL310 L2 cache controller implements three types of Clean & 1199 Invalidate maintenance operations: by Physical Address 1200 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC). 1201 They are architecturally defined to behave as the execution of a 1202 clean operation followed immediately by an invalidate operation, 1203 both performing to the same memory location. This functionality 1204 is not correctly implemented in PL310 as clean lines are not 1205 invalidated as a result of these operations. 1206 1207config ARM_ERRATA_643719 1208 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1209 depends on CPU_V7 && SMP 1210 help 1211 This option enables the workaround for the 643719 Cortex-A9 (prior to 1212 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1213 register returns zero when it should return one. The workaround 1214 corrects this value, ensuring cache maintenance operations which use 1215 it behave as intended and avoiding data corruption. 1216 1217config ARM_ERRATA_720789 1218 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1219 depends on CPU_V7 1220 help 1221 This option enables the workaround for the 720789 Cortex-A9 (prior to 1222 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1223 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1224 As a consequence of this erratum, some TLB entries which should be 1225 invalidated are not, resulting in an incoherency in the system page 1226 tables. The workaround changes the TLB flushing routines to invalidate 1227 entries regardless of the ASID. 1228 1229config PL310_ERRATA_727915 1230 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption" 1231 depends on CACHE_L2X0 1232 help 1233 PL310 implements the Clean & Invalidate by Way L2 cache maintenance 1234 operation (offset 0x7FC). This operation runs in background so that 1235 PL310 can handle normal accesses while it is in progress. Under very 1236 rare circumstances, due to this erratum, write data can be lost when 1237 PL310 treats a cacheable write transaction during a Clean & 1238 Invalidate by Way operation. 1239 1240config ARM_ERRATA_743622 1241 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1242 depends on CPU_V7 1243 depends on !ARCH_MULTIPLATFORM 1244 help 1245 This option enables the workaround for the 743622 Cortex-A9 1246 (r2p*) erratum. Under very rare conditions, a faulty 1247 optimisation in the Cortex-A9 Store Buffer may lead to data 1248 corruption. This workaround sets a specific bit in the diagnostic 1249 register of the Cortex-A9 which disables the Store Buffer 1250 optimisation, preventing the defect from occurring. This has no 1251 visible impact on the overall performance or power consumption of the 1252 processor. 1253 1254config ARM_ERRATA_751472 1255 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1256 depends on CPU_V7 1257 depends on !ARCH_MULTIPLATFORM 1258 help 1259 This option enables the workaround for the 751472 Cortex-A9 (prior 1260 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1261 completion of a following broadcasted operation if the second 1262 operation is received by a CPU before the ICIALLUIS has completed, 1263 potentially leading to corrupted entries in the cache or TLB. 1264 1265config PL310_ERRATA_753970 1266 bool "PL310 errata: cache sync operation may be faulty" 1267 depends on CACHE_PL310 1268 help 1269 This option enables the workaround for the 753970 PL310 (r3p0) erratum. 1270 1271 Under some condition the effect of cache sync operation on 1272 the store buffer still remains when the operation completes. 1273 This means that the store buffer is always asked to drain and 1274 this prevents it from merging any further writes. The workaround 1275 is to replace the normal offset of cache sync operation (0x730) 1276 by another offset targeting an unmapped PL310 register 0x740. 1277 This has the same effect as the cache sync operation: store buffer 1278 drain and waiting for all buffers empty. 1279 1280config ARM_ERRATA_754322 1281 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1282 depends on CPU_V7 1283 help 1284 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1285 r3p*) erratum. A speculative memory access may cause a page table walk 1286 which starts prior to an ASID switch but completes afterwards. This 1287 can populate the micro-TLB with a stale entry which may be hit with 1288 the new ASID. This workaround places two dsb instructions in the mm 1289 switching code so that no page table walks can cross the ASID switch. 1290 1291config ARM_ERRATA_754327 1292 bool "ARM errata: no automatic Store Buffer drain" 1293 depends on CPU_V7 && SMP 1294 help 1295 This option enables the workaround for the 754327 Cortex-A9 (prior to 1296 r2p0) erratum. The Store Buffer does not have any automatic draining 1297 mechanism and therefore a livelock may occur if an external agent 1298 continuously polls a memory location waiting to observe an update. 1299 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1300 written polling loops from denying visibility of updates to memory. 1301 1302config ARM_ERRATA_364296 1303 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1304 depends on CPU_V6 && !SMP 1305 help 1306 This options enables the workaround for the 364296 ARM1136 1307 r0p2 erratum (possible cache data corruption with 1308 hit-under-miss enabled). It sets the undocumented bit 31 in 1309 the auxiliary control register and the FI bit in the control 1310 register, thus disabling hit-under-miss without putting the 1311 processor into full low interrupt latency mode. ARM11MPCore 1312 is not affected. 1313 1314config ARM_ERRATA_764369 1315 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1316 depends on CPU_V7 && SMP 1317 help 1318 This option enables the workaround for erratum 764369 1319 affecting Cortex-A9 MPCore with two or more processors (all 1320 current revisions). Under certain timing circumstances, a data 1321 cache line maintenance operation by MVA targeting an Inner 1322 Shareable memory region may fail to proceed up to either the 1323 Point of Coherency or to the Point of Unification of the 1324 system. This workaround adds a DSB instruction before the 1325 relevant cache maintenance functions and sets a specific bit 1326 in the diagnostic control register of the SCU. 1327 1328config PL310_ERRATA_769419 1329 bool "PL310 errata: no automatic Store Buffer drain" 1330 depends on CACHE_L2X0 1331 help 1332 On revisions of the PL310 prior to r3p2, the Store Buffer does 1333 not automatically drain. This can cause normal, non-cacheable 1334 writes to be retained when the memory system is idle, leading 1335 to suboptimal I/O performance for drivers using coherent DMA. 1336 This option adds a write barrier to the cpu_idle loop so that, 1337 on systems with an outer cache, the store buffer is drained 1338 explicitly. 1339 1340config ARM_ERRATA_775420 1341 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1342 depends on CPU_V7 1343 help 1344 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1345 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1346 operation aborts with MMU exception, it might cause the processor 1347 to deadlock. This workaround puts DSB before executing ISB if 1348 an abort may occur on cache maintenance. 1349 1350config ARM_ERRATA_798181 1351 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1352 depends on CPU_V7 && SMP 1353 help 1354 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1355 adequately shooting down all use of the old entries. This 1356 option enables the Linux kernel workaround for this erratum 1357 which sends an IPI to the CPUs that are running the same ASID 1358 as the one being invalidated. 1359 1360endmenu 1361 1362source "arch/arm/common/Kconfig" 1363 1364menu "Bus support" 1365 1366config ARM_AMBA 1367 bool 1368 1369config ISA 1370 bool 1371 help 1372 Find out whether you have ISA slots on your motherboard. ISA is the 1373 name of a bus system, i.e. the way the CPU talks to the other stuff 1374 inside your box. Other bus systems are PCI, EISA, MicroChannel 1375 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1376 newer boards don't support it. If you have ISA, say Y, otherwise N. 1377 1378# Select ISA DMA controller support 1379config ISA_DMA 1380 bool 1381 select ISA_DMA_API 1382 1383# Select ISA DMA interface 1384config ISA_DMA_API 1385 bool 1386 1387config PCI 1388 bool "PCI support" if MIGHT_HAVE_PCI 1389 help 1390 Find out whether you have a PCI motherboard. PCI is the name of a 1391 bus system, i.e. the way the CPU talks to the other stuff inside 1392 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1393 VESA. If you have PCI, say Y, otherwise N. 1394 1395config PCI_DOMAINS 1396 bool 1397 depends on PCI 1398 1399config PCI_NANOENGINE 1400 bool "BSE nanoEngine PCI support" 1401 depends on SA1100_NANOENGINE 1402 help 1403 Enable PCI on the BSE nanoEngine board. 1404 1405config PCI_SYSCALL 1406 def_bool PCI 1407 1408# Select the host bridge type 1409config PCI_HOST_VIA82C505 1410 bool 1411 depends on PCI && ARCH_SHARK 1412 default y 1413 1414config PCI_HOST_ITE8152 1415 bool 1416 depends on PCI && MACH_ARMCORE 1417 default y 1418 select DMABOUNCE 1419 1420source "drivers/pci/Kconfig" 1421 1422source "drivers/pcmcia/Kconfig" 1423 1424endmenu 1425 1426menu "Kernel Features" 1427 1428config HAVE_SMP 1429 bool 1430 help 1431 This option should be selected by machines which have an SMP- 1432 capable CPU. 1433 1434 The only effect of this option is to make the SMP-related 1435 options available to the user for configuration. 1436 1437config SMP 1438 bool "Symmetric Multi-Processing" 1439 depends on CPU_V6K || CPU_V7 1440 depends on GENERIC_CLOCKEVENTS 1441 depends on HAVE_SMP 1442 depends on MMU 1443 select USE_GENERIC_SMP_HELPERS 1444 help 1445 This enables support for systems with more than one CPU. If you have 1446 a system with only one CPU, like most personal computers, say N. If 1447 you have a system with more than one CPU, say Y. 1448 1449 If you say N here, the kernel will run on single and multiprocessor 1450 machines, but will use only one CPU of a multiprocessor machine. If 1451 you say Y here, the kernel will run on many, but not all, single 1452 processor machines. On a single processor machine, the kernel will 1453 run faster if you say N here. 1454 1455 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1456 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1457 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1458 1459 If you don't know what to do here, say N. 1460 1461config SMP_ON_UP 1462 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)" 1463 depends on SMP && !XIP_KERNEL 1464 default y 1465 help 1466 SMP kernels contain instructions which fail on non-SMP processors. 1467 Enabling this option allows the kernel to modify itself to make 1468 these instructions safe. Disabling it allows about 1K of space 1469 savings. 1470 1471 If you don't know what to do here, say Y. 1472 1473config ARM_CPU_TOPOLOGY 1474 bool "Support cpu topology definition" 1475 depends on SMP && CPU_V7 1476 default y 1477 help 1478 Support ARM cpu topology definition. The MPIDR register defines 1479 affinity between processors which is then used to describe the cpu 1480 topology of an ARM System. 1481 1482config SCHED_MC 1483 bool "Multi-core scheduler support" 1484 depends on ARM_CPU_TOPOLOGY 1485 help 1486 Multi-core scheduler support improves the CPU scheduler's decision 1487 making when dealing with multi-core CPU chips at a cost of slightly 1488 increased overhead in some places. If unsure say N here. 1489 1490config SCHED_SMT 1491 bool "SMT scheduler support" 1492 depends on ARM_CPU_TOPOLOGY 1493 help 1494 Improves the CPU scheduler's decision making when dealing with 1495 MultiThreading at a cost of slightly increased overhead in some 1496 places. If unsure say N here. 1497 1498config HAVE_ARM_SCU 1499 bool 1500 help 1501 This option enables support for the ARM system coherency unit 1502 1503config HAVE_ARM_ARCH_TIMER 1504 bool "Architected timer support" 1505 depends on CPU_V7 1506 select ARM_ARCH_TIMER 1507 help 1508 This option enables support for the ARM architected timer 1509 1510config HAVE_ARM_TWD 1511 bool 1512 depends on SMP 1513 select CLKSRC_OF if OF 1514 help 1515 This options enables support for the ARM timer and watchdog unit 1516 1517config MCPM 1518 bool "Multi-Cluster Power Management" 1519 depends on CPU_V7 && SMP 1520 help 1521 This option provides the common power management infrastructure 1522 for (multi-)cluster based systems, such as big.LITTLE based 1523 systems. 1524 1525choice 1526 prompt "Memory split" 1527 default VMSPLIT_3G 1528 help 1529 Select the desired split between kernel and user memory. 1530 1531 If you are not absolutely sure what you are doing, leave this 1532 option alone! 1533 1534 config VMSPLIT_3G 1535 bool "3G/1G user/kernel split" 1536 config VMSPLIT_2G 1537 bool "2G/2G user/kernel split" 1538 config VMSPLIT_1G 1539 bool "1G/3G user/kernel split" 1540endchoice 1541 1542config PAGE_OFFSET 1543 hex 1544 default 0x40000000 if VMSPLIT_1G 1545 default 0x80000000 if VMSPLIT_2G 1546 default 0xC0000000 1547 1548config NR_CPUS 1549 int "Maximum number of CPUs (2-32)" 1550 range 2 32 1551 depends on SMP 1552 default "4" 1553 1554config HOTPLUG_CPU 1555 bool "Support for hot-pluggable CPUs" 1556 depends on SMP && HOTPLUG 1557 help 1558 Say Y here to experiment with turning CPUs off and on. CPUs 1559 can be controlled through /sys/devices/system/cpu. 1560 1561config ARM_PSCI 1562 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1563 depends on CPU_V7 1564 help 1565 Say Y here if you want Linux to communicate with system firmware 1566 implementing the PSCI specification for CPU-centric power 1567 management operations described in ARM document number ARM DEN 1568 0022A ("Power State Coordination Interface System Software on 1569 ARM processors"). 1570 1571config LOCAL_TIMERS 1572 bool "Use local timer interrupts" 1573 depends on SMP 1574 default y 1575 help 1576 Enable support for local timers on SMP platforms, rather then the 1577 legacy IPI broadcast method. Local timers allows the system 1578 accounting to be spread across the timer interval, preventing a 1579 "thundering herd" at every timer tick. 1580 1581# The GPIO number here must be sorted by descending number. In case of 1582# a multiplatform kernel, we just want the highest value required by the 1583# selected platforms. 1584config ARCH_NR_GPIO 1585 int 1586 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA 1587 default 512 if SOC_OMAP5 1588 default 392 if ARCH_U8500 1589 default 352 if ARCH_VT8500 1590 default 288 if ARCH_SUNXI 1591 default 264 if MACH_H4700 1592 default 0 1593 help 1594 Maximum number of GPIOs in the system. 1595 1596 If unsure, leave the default value. 1597 1598source kernel/Kconfig.preempt 1599 1600config HZ 1601 int 1602 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \ 1603 ARCH_S5PV210 || ARCH_EXYNOS4 1604 default AT91_TIMER_HZ if ARCH_AT91 1605 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE 1606 default 100 1607 1608config SCHED_HRTICK 1609 def_bool HIGH_RES_TIMERS 1610 1611config THUMB2_KERNEL 1612 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1613 depends on CPU_V7 && !CPU_V6 && !CPU_V6K 1614 default y if CPU_THUMBONLY 1615 select AEABI 1616 select ARM_ASM_UNIFIED 1617 select ARM_UNWIND 1618 help 1619 By enabling this option, the kernel will be compiled in 1620 Thumb-2 mode. A compiler/assembler that understand the unified 1621 ARM-Thumb syntax is needed. 1622 1623 If unsure, say N. 1624 1625config THUMB2_AVOID_R_ARM_THM_JUMP11 1626 bool "Work around buggy Thumb-2 short branch relocations in gas" 1627 depends on THUMB2_KERNEL && MODULES 1628 default y 1629 help 1630 Various binutils versions can resolve Thumb-2 branches to 1631 locally-defined, preemptible global symbols as short-range "b.n" 1632 branch instructions. 1633 1634 This is a problem, because there's no guarantee the final 1635 destination of the symbol, or any candidate locations for a 1636 trampoline, are within range of the branch. For this reason, the 1637 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1638 relocation in modules at all, and it makes little sense to add 1639 support. 1640 1641 The symptom is that the kernel fails with an "unsupported 1642 relocation" error when loading some modules. 1643 1644 Until fixed tools are available, passing 1645 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1646 code which hits this problem, at the cost of a bit of extra runtime 1647 stack usage in some cases. 1648 1649 The problem is described in more detail at: 1650 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1651 1652 Only Thumb-2 kernels are affected. 1653 1654 Unless you are sure your tools don't have this problem, say Y. 1655 1656config ARM_ASM_UNIFIED 1657 bool 1658 1659config AEABI 1660 bool "Use the ARM EABI to compile the kernel" 1661 help 1662 This option allows for the kernel to be compiled using the latest 1663 ARM ABI (aka EABI). This is only useful if you are using a user 1664 space environment that is also compiled with EABI. 1665 1666 Since there are major incompatibilities between the legacy ABI and 1667 EABI, especially with regard to structure member alignment, this 1668 option also changes the kernel syscall calling convention to 1669 disambiguate both ABIs and allow for backward compatibility support 1670 (selected with CONFIG_OABI_COMPAT). 1671 1672 To use this you need GCC version 4.0.0 or later. 1673 1674config OABI_COMPAT 1675 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1676 depends on AEABI && !THUMB2_KERNEL 1677 default y 1678 help 1679 This option preserves the old syscall interface along with the 1680 new (ARM EABI) one. It also provides a compatibility layer to 1681 intercept syscalls that have structure arguments which layout 1682 in memory differs between the legacy ABI and the new ARM EABI 1683 (only for non "thumb" binaries). This option adds a tiny 1684 overhead to all syscalls and produces a slightly larger kernel. 1685 If you know you'll be using only pure EABI user space then you 1686 can say N here. If this option is not selected and you attempt 1687 to execute a legacy ABI binary then the result will be 1688 UNPREDICTABLE (in fact it can be predicted that it won't work 1689 at all). If in doubt say Y. 1690 1691config ARCH_HAS_HOLES_MEMORYMODEL 1692 bool 1693 1694config ARCH_SPARSEMEM_ENABLE 1695 bool 1696 1697config ARCH_SPARSEMEM_DEFAULT 1698 def_bool ARCH_SPARSEMEM_ENABLE 1699 1700config ARCH_SELECT_MEMORY_MODEL 1701 def_bool ARCH_SPARSEMEM_ENABLE 1702 1703config HAVE_ARCH_PFN_VALID 1704 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1705 1706config HIGHMEM 1707 bool "High Memory Support" 1708 depends on MMU 1709 help 1710 The address space of ARM processors is only 4 Gigabytes large 1711 and it has to accommodate user address space, kernel address 1712 space as well as some memory mapped IO. That means that, if you 1713 have a large amount of physical memory and/or IO, not all of the 1714 memory can be "permanently mapped" by the kernel. The physical 1715 memory that is not permanently mapped is called "high memory". 1716 1717 Depending on the selected kernel/user memory split, minimum 1718 vmalloc space and actual amount of RAM, you may not need this 1719 option which should result in a slightly faster kernel. 1720 1721 If unsure, say n. 1722 1723config HIGHPTE 1724 bool "Allocate 2nd-level pagetables from highmem" 1725 depends on HIGHMEM 1726 1727config HW_PERF_EVENTS 1728 bool "Enable hardware performance counter support for perf events" 1729 depends on PERF_EVENTS 1730 default y 1731 help 1732 Enable hardware performance counter support for perf events. If 1733 disabled, perf events will use software events only. 1734 1735source "mm/Kconfig" 1736 1737config FORCE_MAX_ZONEORDER 1738 int "Maximum zone order" if ARCH_SHMOBILE 1739 range 11 64 if ARCH_SHMOBILE 1740 default "12" if SOC_AM33XX 1741 default "9" if SA1111 1742 default "11" 1743 help 1744 The kernel memory allocator divides physically contiguous memory 1745 blocks into "zones", where each zone is a power of two number of 1746 pages. This option selects the largest power of two that the kernel 1747 keeps in the memory allocator. If you need to allocate very large 1748 blocks of physically contiguous memory, then you may need to 1749 increase this value. 1750 1751 This config option is actually maximum order plus one. For example, 1752 a value of 11 means that the largest free memory block is 2^10 pages. 1753 1754config ALIGNMENT_TRAP 1755 bool 1756 depends on CPU_CP15_MMU 1757 default y if !ARCH_EBSA110 1758 select HAVE_PROC_CPU if PROC_FS 1759 help 1760 ARM processors cannot fetch/store information which is not 1761 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1762 address divisible by 4. On 32-bit ARM processors, these non-aligned 1763 fetch/store instructions will be emulated in software if you say 1764 here, which has a severe performance impact. This is necessary for 1765 correct operation of some network protocols. With an IP-only 1766 configuration it is safe to say N, otherwise say Y. 1767 1768config UACCESS_WITH_MEMCPY 1769 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1770 depends on MMU 1771 default y if CPU_FEROCEON 1772 help 1773 Implement faster copy_to_user and clear_user methods for CPU 1774 cores where a 8-word STM instruction give significantly higher 1775 memory write throughput than a sequence of individual 32bit stores. 1776 1777 A possible side effect is a slight increase in scheduling latency 1778 between threads sharing the same address space if they invoke 1779 such copy operations with large buffers. 1780 1781 However, if the CPU data cache is using a write-allocate mode, 1782 this option is unlikely to provide any performance gain. 1783 1784config SECCOMP 1785 bool 1786 prompt "Enable seccomp to safely compute untrusted bytecode" 1787 ---help--- 1788 This kernel feature is useful for number crunching applications 1789 that may need to compute untrusted bytecode during their 1790 execution. By using pipes or other transports made available to 1791 the process as file descriptors supporting the read/write 1792 syscalls, it's possible to isolate those applications in 1793 their own address space using seccomp. Once seccomp is 1794 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1795 and the task is only allowed to execute a few safe syscalls 1796 defined by each seccomp mode. 1797 1798config CC_STACKPROTECTOR 1799 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" 1800 help 1801 This option turns on the -fstack-protector GCC feature. This 1802 feature puts, at the beginning of functions, a canary value on 1803 the stack just before the return address, and validates 1804 the value just before actually returning. Stack based buffer 1805 overflows (that need to overwrite this return address) now also 1806 overwrite the canary, which gets detected and the attack is then 1807 neutralized via a kernel panic. 1808 This feature requires gcc version 4.2 or above. 1809 1810config XEN_DOM0 1811 def_bool y 1812 depends on XEN 1813 1814config XEN 1815 bool "Xen guest support on ARM (EXPERIMENTAL)" 1816 depends on ARM && AEABI && OF 1817 depends on CPU_V7 && !CPU_V6 1818 depends on !GENERIC_ATOMIC64 1819 select ARM_PSCI 1820 help 1821 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1822 1823endmenu 1824 1825menu "Boot options" 1826 1827config USE_OF 1828 bool "Flattened Device Tree support" 1829 select IRQ_DOMAIN 1830 select OF 1831 select OF_EARLY_FLATTREE 1832 help 1833 Include support for flattened device tree machine descriptions. 1834 1835config ATAGS 1836 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1837 default y 1838 help 1839 This is the traditional way of passing data to the kernel at boot 1840 time. If you are solely relying on the flattened device tree (or 1841 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1842 to remove ATAGS support from your kernel binary. If unsure, 1843 leave this to y. 1844 1845config DEPRECATED_PARAM_STRUCT 1846 bool "Provide old way to pass kernel parameters" 1847 depends on ATAGS 1848 help 1849 This was deprecated in 2001 and announced to live on for 5 years. 1850 Some old boot loaders still use this way. 1851 1852# Compressed boot loader in ROM. Yes, we really want to ask about 1853# TEXT and BSS so we preserve their values in the config files. 1854config ZBOOT_ROM_TEXT 1855 hex "Compressed ROM boot loader base address" 1856 default "0" 1857 help 1858 The physical address at which the ROM-able zImage is to be 1859 placed in the target. Platforms which normally make use of 1860 ROM-able zImage formats normally set this to a suitable 1861 value in their defconfig file. 1862 1863 If ZBOOT_ROM is not enabled, this has no effect. 1864 1865config ZBOOT_ROM_BSS 1866 hex "Compressed ROM boot loader BSS address" 1867 default "0" 1868 help 1869 The base address of an area of read/write memory in the target 1870 for the ROM-able zImage which must be available while the 1871 decompressor is running. It must be large enough to hold the 1872 entire decompressed kernel plus an additional 128 KiB. 1873 Platforms which normally make use of ROM-able zImage formats 1874 normally set this to a suitable value in their defconfig file. 1875 1876 If ZBOOT_ROM is not enabled, this has no effect. 1877 1878config ZBOOT_ROM 1879 bool "Compressed boot loader in ROM/flash" 1880 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 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 1885choice 1886 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)" 1887 depends on ZBOOT_ROM && ARCH_SH7372 1888 default ZBOOT_ROM_NONE 1889 help 1890 Include experimental SD/MMC loading code in the ROM-able zImage. 1891 With this enabled it is possible to write the ROM-able zImage 1892 kernel image to an MMC or SD card and boot the kernel straight 1893 from the reset vector. At reset the processor Mask ROM will load 1894 the first part of the ROM-able zImage which in turn loads the 1895 rest the kernel image to RAM. 1896 1897config ZBOOT_ROM_NONE 1898 bool "No SD/MMC loader in zImage (EXPERIMENTAL)" 1899 help 1900 Do not load image from SD or MMC 1901 1902config ZBOOT_ROM_MMCIF 1903 bool "Include MMCIF loader in zImage (EXPERIMENTAL)" 1904 help 1905 Load image from MMCIF hardware block. 1906 1907config ZBOOT_ROM_SH_MOBILE_SDHI 1908 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)" 1909 help 1910 Load image from SDHI hardware block 1911 1912endchoice 1913 1914config ARM_APPENDED_DTB 1915 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1916 depends on OF && !ZBOOT_ROM 1917 help 1918 With this option, the boot code will look for a device tree binary 1919 (DTB) appended to zImage 1920 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1921 1922 This is meant as a backward compatibility convenience for those 1923 systems with a bootloader that can't be upgraded to accommodate 1924 the documented boot protocol using a device tree. 1925 1926 Beware that there is very little in terms of protection against 1927 this option being confused by leftover garbage in memory that might 1928 look like a DTB header after a reboot if no actual DTB is appended 1929 to zImage. Do not leave this option active in a production kernel 1930 if you don't intend to always append a DTB. Proper passing of the 1931 location into r2 of a bootloader provided DTB is always preferable 1932 to this option. 1933 1934config ARM_ATAG_DTB_COMPAT 1935 bool "Supplement the appended DTB with traditional ATAG information" 1936 depends on ARM_APPENDED_DTB 1937 help 1938 Some old bootloaders can't be updated to a DTB capable one, yet 1939 they provide ATAGs with memory configuration, the ramdisk address, 1940 the kernel cmdline string, etc. Such information is dynamically 1941 provided by the bootloader and can't always be stored in a static 1942 DTB. To allow a device tree enabled kernel to be used with such 1943 bootloaders, this option allows zImage to extract the information 1944 from the ATAG list and store it at run time into the appended DTB. 1945 1946choice 1947 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1948 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1949 1950config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1951 bool "Use bootloader kernel arguments if available" 1952 help 1953 Uses the command-line options passed by the boot loader instead of 1954 the device tree bootargs property. If the boot loader doesn't provide 1955 any, the device tree bootargs property will be used. 1956 1957config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1958 bool "Extend with bootloader kernel arguments" 1959 help 1960 The command-line arguments provided by the boot loader will be 1961 appended to the the device tree bootargs property. 1962 1963endchoice 1964 1965config CMDLINE 1966 string "Default kernel command string" 1967 default "" 1968 help 1969 On some architectures (EBSA110 and CATS), there is currently no way 1970 for the boot loader to pass arguments to the kernel. For these 1971 architectures, you should supply some command-line options at build 1972 time by entering them here. As a minimum, you should specify the 1973 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1974 1975choice 1976 prompt "Kernel command line type" if CMDLINE != "" 1977 default CMDLINE_FROM_BOOTLOADER 1978 depends on ATAGS 1979 1980config CMDLINE_FROM_BOOTLOADER 1981 bool "Use bootloader kernel arguments if available" 1982 help 1983 Uses the command-line options passed by the boot loader. If 1984 the boot loader doesn't provide any, the default kernel command 1985 string provided in CMDLINE will be used. 1986 1987config CMDLINE_EXTEND 1988 bool "Extend bootloader kernel arguments" 1989 help 1990 The command-line arguments provided by the boot loader will be 1991 appended to the default kernel command string. 1992 1993config CMDLINE_FORCE 1994 bool "Always use the default kernel command string" 1995 help 1996 Always use the default kernel command string, even if the boot 1997 loader passes other arguments to the kernel. 1998 This is useful if you cannot or don't want to change the 1999 command-line options your boot loader passes to the kernel. 2000endchoice 2001 2002config XIP_KERNEL 2003 bool "Kernel Execute-In-Place from ROM" 2004 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM 2005 help 2006 Execute-In-Place allows the kernel to run from non-volatile storage 2007 directly addressable by the CPU, such as NOR flash. This saves RAM 2008 space since the text section of the kernel is not loaded from flash 2009 to RAM. Read-write sections, such as the data section and stack, 2010 are still copied to RAM. The XIP kernel is not compressed since 2011 it has to run directly from flash, so it will take more space to 2012 store it. The flash address used to link the kernel object files, 2013 and for storing it, is configuration dependent. Therefore, if you 2014 say Y here, you must know the proper physical address where to 2015 store the kernel image depending on your own flash memory usage. 2016 2017 Also note that the make target becomes "make xipImage" rather than 2018 "make zImage" or "make Image". The final kernel binary to put in 2019 ROM memory will be arch/arm/boot/xipImage. 2020 2021 If unsure, say N. 2022 2023config XIP_PHYS_ADDR 2024 hex "XIP Kernel Physical Location" 2025 depends on XIP_KERNEL 2026 default "0x00080000" 2027 help 2028 This is the physical address in your flash memory the kernel will 2029 be linked for and stored to. This address is dependent on your 2030 own flash usage. 2031 2032config KEXEC 2033 bool "Kexec system call (EXPERIMENTAL)" 2034 depends on (!SMP || PM_SLEEP_SMP) 2035 help 2036 kexec is a system call that implements the ability to shutdown your 2037 current kernel, and to start another kernel. It is like a reboot 2038 but it is independent of the system firmware. And like a reboot 2039 you can start any kernel with it, not just Linux. 2040 2041 It is an ongoing process to be certain the hardware in a machine 2042 is properly shutdown, so do not be surprised if this code does not 2043 initially work for you. It may help to enable device hotplugging 2044 support. 2045 2046config ATAGS_PROC 2047 bool "Export atags in procfs" 2048 depends on ATAGS && KEXEC 2049 default y 2050 help 2051 Should the atags used to boot the kernel be exported in an "atags" 2052 file in procfs. Useful with kexec. 2053 2054config CRASH_DUMP 2055 bool "Build kdump crash kernel (EXPERIMENTAL)" 2056 help 2057 Generate crash dump after being started by kexec. This should 2058 be normally only set in special crash dump kernels which are 2059 loaded in the main kernel with kexec-tools into a specially 2060 reserved region and then later executed after a crash by 2061 kdump/kexec. The crash dump kernel must be compiled to a 2062 memory address not used by the main kernel 2063 2064 For more details see Documentation/kdump/kdump.txt 2065 2066config AUTO_ZRELADDR 2067 bool "Auto calculation of the decompressed kernel image address" 2068 depends on !ZBOOT_ROM && !ARCH_U300 2069 help 2070 ZRELADDR is the physical address where the decompressed kernel 2071 image will be placed. If AUTO_ZRELADDR is selected, the address 2072 will be determined at run-time by masking the current IP with 2073 0xf8000000. This assumes the zImage being placed in the first 128MB 2074 from start of memory. 2075 2076endmenu 2077 2078menu "CPU Power Management" 2079 2080if ARCH_HAS_CPUFREQ 2081source "drivers/cpufreq/Kconfig" 2082 2083config CPU_FREQ_S3C 2084 bool 2085 help 2086 Internal configuration node for common cpufreq on Samsung SoC 2087 2088config CPU_FREQ_S3C24XX 2089 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)" 2090 depends on ARCH_S3C24XX && CPU_FREQ 2091 select CPU_FREQ_S3C 2092 help 2093 This enables the CPUfreq driver for the Samsung S3C24XX family 2094 of CPUs. 2095 2096 For details, take a look at <file:Documentation/cpu-freq>. 2097 2098 If in doubt, say N. 2099 2100config CPU_FREQ_S3C24XX_PLL 2101 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)" 2102 depends on CPU_FREQ_S3C24XX 2103 help 2104 Compile in support for changing the PLL frequency from the 2105 S3C24XX series CPUfreq driver. The PLL takes time to settle 2106 after a frequency change, so by default it is not enabled. 2107 2108 This also means that the PLL tables for the selected CPU(s) will 2109 be built which may increase the size of the kernel image. 2110 2111config CPU_FREQ_S3C24XX_DEBUG 2112 bool "Debug CPUfreq Samsung driver core" 2113 depends on CPU_FREQ_S3C24XX 2114 help 2115 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core 2116 2117config CPU_FREQ_S3C24XX_IODEBUG 2118 bool "Debug CPUfreq Samsung driver IO timing" 2119 depends on CPU_FREQ_S3C24XX 2120 help 2121 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core 2122 2123config CPU_FREQ_S3C24XX_DEBUGFS 2124 bool "Export debugfs for CPUFreq" 2125 depends on CPU_FREQ_S3C24XX && DEBUG_FS 2126 help 2127 Export status information via debugfs. 2128 2129endif 2130 2131source "drivers/cpuidle/Kconfig" 2132 2133endmenu 2134 2135menu "Floating point emulation" 2136 2137comment "At least one emulation must be selected" 2138 2139config FPE_NWFPE 2140 bool "NWFPE math emulation" 2141 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2142 ---help--- 2143 Say Y to include the NWFPE floating point emulator in the kernel. 2144 This is necessary to run most binaries. Linux does not currently 2145 support floating point hardware so you need to say Y here even if 2146 your machine has an FPA or floating point co-processor podule. 2147 2148 You may say N here if you are going to load the Acorn FPEmulator 2149 early in the bootup. 2150 2151config FPE_NWFPE_XP 2152 bool "Support extended precision" 2153 depends on FPE_NWFPE 2154 help 2155 Say Y to include 80-bit support in the kernel floating-point 2156 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2157 Note that gcc does not generate 80-bit operations by default, 2158 so in most cases this option only enlarges the size of the 2159 floating point emulator without any good reason. 2160 2161 You almost surely want to say N here. 2162 2163config FPE_FASTFPE 2164 bool "FastFPE math emulation (EXPERIMENTAL)" 2165 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2166 ---help--- 2167 Say Y here to include the FAST floating point emulator in the kernel. 2168 This is an experimental much faster emulator which now also has full 2169 precision for the mantissa. It does not support any exceptions. 2170 It is very simple, and approximately 3-6 times faster than NWFPE. 2171 2172 It should be sufficient for most programs. It may be not suitable 2173 for scientific calculations, but you have to check this for yourself. 2174 If you do not feel you need a faster FP emulation you should better 2175 choose NWFPE. 2176 2177config VFP 2178 bool "VFP-format floating point maths" 2179 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2180 help 2181 Say Y to include VFP support code in the kernel. This is needed 2182 if your hardware includes a VFP unit. 2183 2184 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2185 release notes and additional status information. 2186 2187 Say N if your target does not have VFP hardware. 2188 2189config VFPv3 2190 bool 2191 depends on VFP 2192 default y if CPU_V7 2193 2194config NEON 2195 bool "Advanced SIMD (NEON) Extension support" 2196 depends on VFPv3 && CPU_V7 2197 help 2198 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2199 Extension. 2200 2201endmenu 2202 2203menu "Userspace binary formats" 2204 2205source "fs/Kconfig.binfmt" 2206 2207config ARTHUR 2208 tristate "RISC OS personality" 2209 depends on !AEABI 2210 help 2211 Say Y here to include the kernel code necessary if you want to run 2212 Acorn RISC OS/Arthur binaries under Linux. This code is still very 2213 experimental; if this sounds frightening, say N and sleep in peace. 2214 You can also say M here to compile this support as a module (which 2215 will be called arthur). 2216 2217endmenu 2218 2219menu "Power management options" 2220 2221source "kernel/power/Kconfig" 2222 2223config ARCH_SUSPEND_POSSIBLE 2224 depends on !ARCH_S5PC100 2225 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \ 2226 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2227 def_bool y 2228 2229config ARM_CPU_SUSPEND 2230 def_bool PM_SLEEP 2231 2232endmenu 2233 2234source "net/Kconfig" 2235 2236source "drivers/Kconfig" 2237 2238source "fs/Kconfig" 2239 2240source "arch/arm/Kconfig.debug" 2241 2242source "security/Kconfig" 2243 2244source "crypto/Kconfig" 2245 2246source "lib/Kconfig" 2247 2248source "arch/arm/kvm/Kconfig" 2249