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_SMP_IDLE_THREAD 18 select GENERIC_IDLE_POLL_SETUP 19 select GENERIC_STRNCPY_FROM_USER 20 select GENERIC_STRNLEN_USER 21 select HARDIRQS_SW_RESEND 22 select HAVE_AOUT 23 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL 24 select HAVE_ARCH_KGDB 25 select HAVE_ARCH_SECCOMP_FILTER 26 select HAVE_ARCH_TRACEHOOK 27 select HAVE_BPF_JIT 28 select HAVE_C_RECORDMCOUNT 29 select HAVE_DEBUG_KMEMLEAK 30 select HAVE_DMA_API_DEBUG 31 select HAVE_DMA_ATTRS 32 select HAVE_DMA_CONTIGUOUS if MMU 33 select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) 34 select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL) 35 select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL) 36 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL) 37 select HAVE_GENERIC_DMA_COHERENT 38 select HAVE_GENERIC_HARDIRQS 39 select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)) 40 select HAVE_IDE if PCI || ISA || PCMCIA 41 select HAVE_IRQ_TIME_ACCOUNTING 42 select HAVE_KERNEL_GZIP 43 select HAVE_KERNEL_LZMA 44 select HAVE_KERNEL_LZO 45 select HAVE_KERNEL_XZ 46 select HAVE_KPROBES if !XIP_KERNEL 47 select HAVE_KRETPROBES if (HAVE_KPROBES) 48 select HAVE_MEMBLOCK 49 select HAVE_OPROFILE if (HAVE_PERF_EVENTS) 50 select HAVE_PERF_EVENTS 51 select HAVE_REGS_AND_STACK_ACCESS_API 52 select HAVE_SYSCALL_TRACEPOINTS 53 select HAVE_UID16 54 select KTIME_SCALAR 55 select PERF_USE_VMALLOC 56 select RTC_LIB 57 select SYS_SUPPORTS_APM_EMULATION 58 select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND 59 select MODULES_USE_ELF_REL 60 select CLONE_BACKWARDS 61 select OLD_SIGSUSPEND3 62 select OLD_SIGACTION 63 select HAVE_CONTEXT_TRACKING 64 help 65 The ARM series is a line of low-power-consumption RISC chip designs 66 licensed by ARM Ltd and targeted at embedded applications and 67 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 68 manufactured, but legacy ARM-based PC hardware remains popular in 69 Europe. There is an ARM Linux project with a web page at 70 <http://www.arm.linux.org.uk/>. 71 72config ARM_HAS_SG_CHAIN 73 bool 74 75config NEED_SG_DMA_LENGTH 76 bool 77 78config ARM_DMA_USE_IOMMU 79 bool 80 select ARM_HAS_SG_CHAIN 81 select NEED_SG_DMA_LENGTH 82 83if ARM_DMA_USE_IOMMU 84 85config ARM_DMA_IOMMU_ALIGNMENT 86 int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers" 87 range 4 9 88 default 8 89 help 90 DMA mapping framework by default aligns all buffers to the smallest 91 PAGE_SIZE order which is greater than or equal to the requested buffer 92 size. This works well for buffers up to a few hundreds kilobytes, but 93 for larger buffers it just a waste of address space. Drivers which has 94 relatively small addressing window (like 64Mib) might run out of 95 virtual space with just a few allocations. 96 97 With this parameter you can specify the maximum PAGE_SIZE order for 98 DMA IOMMU buffers. Larger buffers will be aligned only to this 99 specified order. The order is expressed as a power of two multiplied 100 by the PAGE_SIZE. 101 102endif 103 104config HAVE_PWM 105 bool 106 107config MIGHT_HAVE_PCI 108 bool 109 110config SYS_SUPPORTS_APM_EMULATION 111 bool 112 113config HAVE_TCM 114 bool 115 select GENERIC_ALLOCATOR 116 117config HAVE_PROC_CPU 118 bool 119 120config NO_IOPORT 121 bool 122 123config EISA 124 bool 125 ---help--- 126 The Extended Industry Standard Architecture (EISA) bus was 127 developed as an open alternative to the IBM MicroChannel bus. 128 129 The EISA bus provided some of the features of the IBM MicroChannel 130 bus while maintaining backward compatibility with cards made for 131 the older ISA bus. The EISA bus saw limited use between 1988 and 132 1995 when it was made obsolete by the PCI bus. 133 134 Say Y here if you are building a kernel for an EISA-based machine. 135 136 Otherwise, say N. 137 138config SBUS 139 bool 140 141config STACKTRACE_SUPPORT 142 bool 143 default y 144 145config HAVE_LATENCYTOP_SUPPORT 146 bool 147 depends on !SMP 148 default y 149 150config LOCKDEP_SUPPORT 151 bool 152 default y 153 154config TRACE_IRQFLAGS_SUPPORT 155 bool 156 default y 157 158config RWSEM_GENERIC_SPINLOCK 159 bool 160 default y 161 162config RWSEM_XCHGADD_ALGORITHM 163 bool 164 165config ARCH_HAS_ILOG2_U32 166 bool 167 168config ARCH_HAS_ILOG2_U64 169 bool 170 171config ARCH_HAS_CPUFREQ 172 bool 173 help 174 Internal node to signify that the ARCH has CPUFREQ support 175 and that the relevant menu configurations are displayed for 176 it. 177 178config GENERIC_HWEIGHT 179 bool 180 default y 181 182config GENERIC_CALIBRATE_DELAY 183 bool 184 default y 185 186config ARCH_MAY_HAVE_PC_FDC 187 bool 188 189config ZONE_DMA 190 bool 191 192config NEED_DMA_MAP_STATE 193 def_bool y 194 195config ARCH_HAS_DMA_SET_COHERENT_MASK 196 bool 197 198config GENERIC_ISA_DMA 199 bool 200 201config FIQ 202 bool 203 204config NEED_RET_TO_USER 205 bool 206 207config ARCH_MTD_XIP 208 bool 209 210config VECTORS_BASE 211 hex 212 default 0xffff0000 if MMU || CPU_HIGH_VECTOR 213 default DRAM_BASE if REMAP_VECTORS_TO_RAM 214 default 0x00000000 215 help 216 The base address of exception vectors. 217 218config ARM_PATCH_PHYS_VIRT 219 bool "Patch physical to virtual translations at runtime" if EMBEDDED 220 default y 221 depends on !XIP_KERNEL && MMU 222 depends on !ARCH_REALVIEW || !SPARSEMEM 223 help 224 Patch phys-to-virt and virt-to-phys translation functions at 225 boot and module load time according to the position of the 226 kernel in system memory. 227 228 This can only be used with non-XIP MMU kernels where the base 229 of physical memory is at a 16MB boundary. 230 231 Only disable this option if you know that you do not require 232 this feature (eg, building a kernel for a single machine) and 233 you need to shrink the kernel to the minimal size. 234 235config NEED_MACH_GPIO_H 236 bool 237 help 238 Select this when mach/gpio.h is required to provide special 239 definitions for this platform. The need for mach/gpio.h should 240 be avoided when possible. 241 242config NEED_MACH_IO_H 243 bool 244 help 245 Select this when mach/io.h is required to provide special 246 definitions for this platform. The need for mach/io.h should 247 be avoided when possible. 248 249config NEED_MACH_MEMORY_H 250 bool 251 help 252 Select this when mach/memory.h is required to provide special 253 definitions for this platform. The need for mach/memory.h should 254 be avoided when possible. 255 256config PHYS_OFFSET 257 hex "Physical address of main memory" if MMU 258 depends on !ARM_PATCH_PHYS_VIRT && !NEED_MACH_MEMORY_H 259 default DRAM_BASE if !MMU 260 help 261 Please provide the physical address corresponding to the 262 location of main memory in your system. 263 264config GENERIC_BUG 265 def_bool y 266 depends on BUG 267 268source "init/Kconfig" 269 270source "kernel/Kconfig.freezer" 271 272menu "System Type" 273 274config MMU 275 bool "MMU-based Paged Memory Management Support" 276 default y 277 help 278 Select if you want MMU-based virtualised addressing space 279 support by paged memory management. If unsure, say 'Y'. 280 281# 282# The "ARM system type" choice list is ordered alphabetically by option 283# text. Please add new entries in the option alphabetic order. 284# 285choice 286 prompt "ARM system type" 287 default ARCH_VERSATILE if !MMU 288 default ARCH_MULTIPLATFORM if MMU 289 290config ARCH_MULTIPLATFORM 291 bool "Allow multiple platforms to be selected" 292 depends on MMU 293 select ARM_PATCH_PHYS_VIRT 294 select AUTO_ZRELADDR 295 select COMMON_CLK 296 select MULTI_IRQ_HANDLER 297 select SPARSE_IRQ 298 select USE_OF 299 300config ARCH_INTEGRATOR 301 bool "ARM Ltd. Integrator family" 302 select ARCH_HAS_CPUFREQ 303 select ARM_AMBA 304 select COMMON_CLK 305 select COMMON_CLK_VERSATILE 306 select GENERIC_CLOCKEVENTS 307 select HAVE_TCM 308 select ICST 309 select MULTI_IRQ_HANDLER 310 select NEED_MACH_MEMORY_H 311 select PLAT_VERSATILE 312 select SPARSE_IRQ 313 select VERSATILE_FPGA_IRQ 314 help 315 Support for ARM's Integrator platform. 316 317config ARCH_REALVIEW 318 bool "ARM Ltd. RealView family" 319 select ARCH_WANT_OPTIONAL_GPIOLIB 320 select ARM_AMBA 321 select ARM_TIMER_SP804 322 select COMMON_CLK 323 select COMMON_CLK_VERSATILE 324 select GENERIC_CLOCKEVENTS 325 select GPIO_PL061 if GPIOLIB 326 select ICST 327 select NEED_MACH_MEMORY_H 328 select PLAT_VERSATILE 329 select PLAT_VERSATILE_CLCD 330 help 331 This enables support for ARM Ltd RealView boards. 332 333config ARCH_VERSATILE 334 bool "ARM Ltd. Versatile family" 335 select ARCH_WANT_OPTIONAL_GPIOLIB 336 select ARM_AMBA 337 select ARM_TIMER_SP804 338 select ARM_VIC 339 select CLKDEV_LOOKUP 340 select GENERIC_CLOCKEVENTS 341 select HAVE_MACH_CLKDEV 342 select ICST 343 select PLAT_VERSATILE 344 select PLAT_VERSATILE_CLCD 345 select PLAT_VERSATILE_CLOCK 346 select VERSATILE_FPGA_IRQ 347 help 348 This enables support for ARM Ltd Versatile board. 349 350config ARCH_AT91 351 bool "Atmel AT91" 352 select ARCH_REQUIRE_GPIOLIB 353 select CLKDEV_LOOKUP 354 select HAVE_CLK 355 select IRQ_DOMAIN 356 select NEED_MACH_GPIO_H 357 select NEED_MACH_IO_H if PCCARD 358 select PINCTRL 359 select PINCTRL_AT91 if USE_OF 360 help 361 This enables support for systems based on Atmel 362 AT91RM9200 and AT91SAM9* processors. 363 364config ARCH_CLPS711X 365 bool "Cirrus Logic CLPS711x/EP721x/EP731x-based" 366 select ARCH_REQUIRE_GPIOLIB 367 select AUTO_ZRELADDR 368 select CLKDEV_LOOKUP 369 select COMMON_CLK 370 select CPU_ARM720T 371 select GENERIC_CLOCKEVENTS 372 select MULTI_IRQ_HANDLER 373 select NEED_MACH_MEMORY_H 374 select SPARSE_IRQ 375 help 376 Support for Cirrus Logic 711x/721x/731x based boards. 377 378config ARCH_GEMINI 379 bool "Cortina Systems Gemini" 380 select ARCH_REQUIRE_GPIOLIB 381 select ARCH_USES_GETTIMEOFFSET 382 select NEED_MACH_GPIO_H 383 select CPU_FA526 384 help 385 Support for the Cortina Systems Gemini family SoCs 386 387config ARCH_EBSA110 388 bool "EBSA-110" 389 select ARCH_USES_GETTIMEOFFSET 390 select CPU_SA110 391 select ISA 392 select NEED_MACH_IO_H 393 select NEED_MACH_MEMORY_H 394 select NO_IOPORT 395 help 396 This is an evaluation board for the StrongARM processor available 397 from Digital. It has limited hardware on-board, including an 398 Ethernet interface, two PCMCIA sockets, two serial ports and a 399 parallel port. 400 401config ARCH_EP93XX 402 bool "EP93xx-based" 403 select ARCH_HAS_HOLES_MEMORYMODEL 404 select ARCH_REQUIRE_GPIOLIB 405 select ARCH_USES_GETTIMEOFFSET 406 select ARM_AMBA 407 select ARM_VIC 408 select CLKDEV_LOOKUP 409 select CPU_ARM920T 410 select NEED_MACH_MEMORY_H 411 help 412 This enables support for the Cirrus EP93xx series of CPUs. 413 414config ARCH_FOOTBRIDGE 415 bool "FootBridge" 416 select CPU_SA110 417 select FOOTBRIDGE 418 select GENERIC_CLOCKEVENTS 419 select HAVE_IDE 420 select NEED_MACH_IO_H if !MMU 421 select NEED_MACH_MEMORY_H 422 help 423 Support for systems based on the DC21285 companion chip 424 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 425 426config ARCH_NETX 427 bool "Hilscher NetX based" 428 select ARM_VIC 429 select CLKSRC_MMIO 430 select CPU_ARM926T 431 select GENERIC_CLOCKEVENTS 432 help 433 This enables support for systems based on the Hilscher NetX Soc 434 435config ARCH_IOP13XX 436 bool "IOP13xx-based" 437 depends on MMU 438 select ARCH_SUPPORTS_MSI 439 select CPU_XSC3 440 select NEED_MACH_MEMORY_H 441 select NEED_RET_TO_USER 442 select PCI 443 select PLAT_IOP 444 select VMSPLIT_1G 445 help 446 Support for Intel's IOP13XX (XScale) family of processors. 447 448config ARCH_IOP32X 449 bool "IOP32x-based" 450 depends on MMU 451 select ARCH_REQUIRE_GPIOLIB 452 select CPU_XSCALE 453 select NEED_MACH_GPIO_H 454 select NEED_RET_TO_USER 455 select PCI 456 select PLAT_IOP 457 help 458 Support for Intel's 80219 and IOP32X (XScale) family of 459 processors. 460 461config ARCH_IOP33X 462 bool "IOP33x-based" 463 depends on MMU 464 select ARCH_REQUIRE_GPIOLIB 465 select CPU_XSCALE 466 select NEED_MACH_GPIO_H 467 select NEED_RET_TO_USER 468 select PCI 469 select PLAT_IOP 470 help 471 Support for Intel's IOP33X (XScale) family of processors. 472 473config ARCH_IXP4XX 474 bool "IXP4xx-based" 475 depends on MMU 476 select ARCH_HAS_DMA_SET_COHERENT_MASK 477 select ARCH_REQUIRE_GPIOLIB 478 select CLKSRC_MMIO 479 select CPU_XSCALE 480 select DMABOUNCE if PCI 481 select GENERIC_CLOCKEVENTS 482 select MIGHT_HAVE_PCI 483 select NEED_MACH_IO_H 484 select USB_EHCI_BIG_ENDIAN_MMIO 485 select USB_EHCI_BIG_ENDIAN_DESC 486 help 487 Support for Intel's IXP4XX (XScale) family of processors. 488 489config ARCH_DOVE 490 bool "Marvell Dove" 491 select ARCH_REQUIRE_GPIOLIB 492 select CPU_PJ4 493 select GENERIC_CLOCKEVENTS 494 select MIGHT_HAVE_PCI 495 select PINCTRL 496 select PINCTRL_DOVE 497 select PLAT_ORION_LEGACY 498 select USB_ARCH_HAS_EHCI 499 select MVEBU_MBUS 500 help 501 Support for the Marvell Dove SoC 88AP510 502 503config ARCH_KIRKWOOD 504 bool "Marvell Kirkwood" 505 select ARCH_REQUIRE_GPIOLIB 506 select CPU_FEROCEON 507 select GENERIC_CLOCKEVENTS 508 select PCI 509 select PCI_QUIRKS 510 select PINCTRL 511 select PINCTRL_KIRKWOOD 512 select PLAT_ORION_LEGACY 513 select MVEBU_MBUS 514 help 515 Support for the following Marvell Kirkwood series SoCs: 516 88F6180, 88F6192 and 88F6281. 517 518config ARCH_MV78XX0 519 bool "Marvell MV78xx0" 520 select ARCH_REQUIRE_GPIOLIB 521 select CPU_FEROCEON 522 select GENERIC_CLOCKEVENTS 523 select PCI 524 select PLAT_ORION_LEGACY 525 select MVEBU_MBUS 526 help 527 Support for the following Marvell MV78xx0 series SoCs: 528 MV781x0, MV782x0. 529 530config ARCH_ORION5X 531 bool "Marvell Orion" 532 depends on MMU 533 select ARCH_REQUIRE_GPIOLIB 534 select CPU_FEROCEON 535 select GENERIC_CLOCKEVENTS 536 select PCI 537 select PLAT_ORION_LEGACY 538 select MVEBU_MBUS 539 help 540 Support for the following Marvell Orion 5x series SoCs: 541 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182), 542 Orion-2 (5281), Orion-1-90 (6183). 543 544config ARCH_MMP 545 bool "Marvell PXA168/910/MMP2" 546 depends on MMU 547 select ARCH_REQUIRE_GPIOLIB 548 select CLKDEV_LOOKUP 549 select GENERIC_ALLOCATOR 550 select GENERIC_CLOCKEVENTS 551 select GPIO_PXA 552 select IRQ_DOMAIN 553 select NEED_MACH_GPIO_H 554 select PINCTRL 555 select PLAT_PXA 556 select SPARSE_IRQ 557 help 558 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line. 559 560config ARCH_KS8695 561 bool "Micrel/Kendin KS8695" 562 select ARCH_REQUIRE_GPIOLIB 563 select CLKSRC_MMIO 564 select CPU_ARM922T 565 select GENERIC_CLOCKEVENTS 566 select NEED_MACH_MEMORY_H 567 help 568 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based 569 System-on-Chip devices. 570 571config ARCH_W90X900 572 bool "Nuvoton W90X900 CPU" 573 select ARCH_REQUIRE_GPIOLIB 574 select CLKDEV_LOOKUP 575 select CLKSRC_MMIO 576 select CPU_ARM926T 577 select GENERIC_CLOCKEVENTS 578 help 579 Support for Nuvoton (Winbond logic dept.) ARM9 processor, 580 At present, the w90x900 has been renamed nuc900, regarding 581 the ARM series product line, you can login the following 582 link address to know more. 583 584 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/ 585 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller> 586 587config ARCH_LPC32XX 588 bool "NXP LPC32XX" 589 select ARCH_REQUIRE_GPIOLIB 590 select ARM_AMBA 591 select CLKDEV_LOOKUP 592 select CLKSRC_MMIO 593 select CPU_ARM926T 594 select GENERIC_CLOCKEVENTS 595 select HAVE_IDE 596 select HAVE_PWM 597 select USB_ARCH_HAS_OHCI 598 select USE_OF 599 help 600 Support for the NXP LPC32XX family of processors 601 602config ARCH_PXA 603 bool "PXA2xx/PXA3xx-based" 604 depends on MMU 605 select ARCH_HAS_CPUFREQ 606 select ARCH_MTD_XIP 607 select ARCH_REQUIRE_GPIOLIB 608 select ARM_CPU_SUSPEND if PM 609 select AUTO_ZRELADDR 610 select CLKDEV_LOOKUP 611 select CLKSRC_MMIO 612 select GENERIC_CLOCKEVENTS 613 select GPIO_PXA 614 select HAVE_IDE 615 select MULTI_IRQ_HANDLER 616 select NEED_MACH_GPIO_H 617 select PLAT_PXA 618 select SPARSE_IRQ 619 help 620 Support for Intel/Marvell's PXA2xx/PXA3xx processor line. 621 622config ARCH_MSM 623 bool "Qualcomm MSM" 624 select ARCH_REQUIRE_GPIOLIB 625 select CLKDEV_LOOKUP 626 select GENERIC_CLOCKEVENTS 627 select HAVE_CLK 628 help 629 Support for Qualcomm MSM/QSD based systems. This runs on the 630 apps processor of the MSM/QSD and depends on a shared memory 631 interface to the modem processor which runs the baseband 632 stack and controls some vital subsystems 633 (clock and power control, etc). 634 635config ARCH_SHMOBILE 636 bool "Renesas SH-Mobile / R-Mobile" 637 select CLKDEV_LOOKUP 638 select GENERIC_CLOCKEVENTS 639 select HAVE_ARM_SCU if SMP 640 select HAVE_ARM_TWD if LOCAL_TIMERS 641 select HAVE_CLK 642 select HAVE_MACH_CLKDEV 643 select HAVE_SMP 644 select MIGHT_HAVE_CACHE_L2X0 645 select MULTI_IRQ_HANDLER 646 select NEED_MACH_MEMORY_H 647 select NO_IOPORT 648 select PINCTRL if ARCH_WANT_OPTIONAL_GPIOLIB 649 select PM_GENERIC_DOMAINS if PM 650 select SPARSE_IRQ 651 help 652 Support for Renesas's SH-Mobile and R-Mobile ARM platforms. 653 654config ARCH_RPC 655 bool "RiscPC" 656 select ARCH_ACORN 657 select ARCH_MAY_HAVE_PC_FDC 658 select ARCH_SPARSEMEM_ENABLE 659 select ARCH_USES_GETTIMEOFFSET 660 select FIQ 661 select HAVE_IDE 662 select HAVE_PATA_PLATFORM 663 select ISA_DMA_API 664 select NEED_MACH_IO_H 665 select NEED_MACH_MEMORY_H 666 select NO_IOPORT 667 select VIRT_TO_BUS 668 help 669 On the Acorn Risc-PC, Linux can support the internal IDE disk and 670 CD-ROM interface, serial and parallel port, and the floppy drive. 671 672config ARCH_SA1100 673 bool "SA1100-based" 674 select ARCH_HAS_CPUFREQ 675 select ARCH_MTD_XIP 676 select ARCH_REQUIRE_GPIOLIB 677 select ARCH_SPARSEMEM_ENABLE 678 select CLKDEV_LOOKUP 679 select CLKSRC_MMIO 680 select CPU_FREQ 681 select CPU_SA1100 682 select GENERIC_CLOCKEVENTS 683 select HAVE_IDE 684 select ISA 685 select NEED_MACH_GPIO_H 686 select NEED_MACH_MEMORY_H 687 select SPARSE_IRQ 688 help 689 Support for StrongARM 11x0 based boards. 690 691config ARCH_S3C24XX 692 bool "Samsung S3C24XX SoCs" 693 select ARCH_HAS_CPUFREQ 694 select ARCH_REQUIRE_GPIOLIB 695 select CLKDEV_LOOKUP 696 select CLKSRC_MMIO 697 select GENERIC_CLOCKEVENTS 698 select HAVE_CLK 699 select HAVE_S3C2410_I2C if I2C 700 select HAVE_S3C2410_WATCHDOG if WATCHDOG 701 select HAVE_S3C_RTC if RTC_CLASS 702 select MULTI_IRQ_HANDLER 703 select NEED_MACH_GPIO_H 704 select NEED_MACH_IO_H 705 help 706 Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443 707 and S3C2450 SoCs based systems, such as the Simtec Electronics BAST 708 (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the 709 Samsung SMDK2410 development board (and derivatives). 710 711config ARCH_S3C64XX 712 bool "Samsung S3C64XX" 713 select ARCH_HAS_CPUFREQ 714 select ARCH_REQUIRE_GPIOLIB 715 select ARM_VIC 716 select CLKDEV_LOOKUP 717 select CLKSRC_MMIO 718 select CPU_V6 719 select GENERIC_CLOCKEVENTS 720 select HAVE_CLK 721 select HAVE_S3C2410_I2C if I2C 722 select HAVE_S3C2410_WATCHDOG if WATCHDOG 723 select HAVE_TCM 724 select NEED_MACH_GPIO_H 725 select NO_IOPORT 726 select PLAT_SAMSUNG 727 select S3C_DEV_NAND 728 select S3C_GPIO_TRACK 729 select SAMSUNG_CLKSRC 730 select SAMSUNG_GPIOLIB_4BIT 731 select SAMSUNG_IRQ_VIC_TIMER 732 select USB_ARCH_HAS_OHCI 733 help 734 Samsung S3C64XX series based systems 735 736config ARCH_S5P64X0 737 bool "Samsung S5P6440 S5P6450" 738 select CLKDEV_LOOKUP 739 select CLKSRC_MMIO 740 select CPU_V6 741 select GENERIC_CLOCKEVENTS 742 select HAVE_CLK 743 select HAVE_S3C2410_I2C if I2C 744 select HAVE_S3C2410_WATCHDOG if WATCHDOG 745 select HAVE_S3C_RTC if RTC_CLASS 746 select NEED_MACH_GPIO_H 747 help 748 Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440, 749 SMDK6450. 750 751config ARCH_S5PC100 752 bool "Samsung S5PC100" 753 select ARCH_REQUIRE_GPIOLIB 754 select CLKDEV_LOOKUP 755 select CLKSRC_MMIO 756 select CPU_V7 757 select GENERIC_CLOCKEVENTS 758 select HAVE_CLK 759 select HAVE_S3C2410_I2C if I2C 760 select HAVE_S3C2410_WATCHDOG if WATCHDOG 761 select HAVE_S3C_RTC if RTC_CLASS 762 select NEED_MACH_GPIO_H 763 help 764 Samsung S5PC100 series based systems 765 766config ARCH_S5PV210 767 bool "Samsung S5PV210/S5PC110" 768 select ARCH_HAS_CPUFREQ 769 select ARCH_HAS_HOLES_MEMORYMODEL 770 select ARCH_SPARSEMEM_ENABLE 771 select CLKDEV_LOOKUP 772 select CLKSRC_MMIO 773 select CPU_V7 774 select GENERIC_CLOCKEVENTS 775 select HAVE_CLK 776 select HAVE_S3C2410_I2C if I2C 777 select HAVE_S3C2410_WATCHDOG if WATCHDOG 778 select HAVE_S3C_RTC if RTC_CLASS 779 select NEED_MACH_GPIO_H 780 select NEED_MACH_MEMORY_H 781 help 782 Samsung S5PV210/S5PC110 series based systems 783 784config ARCH_EXYNOS 785 bool "Samsung EXYNOS" 786 select ARCH_HAS_CPUFREQ 787 select ARCH_HAS_HOLES_MEMORYMODEL 788 select ARCH_SPARSEMEM_ENABLE 789 select CLKDEV_LOOKUP 790 select COMMON_CLK 791 select CPU_V7 792 select GENERIC_CLOCKEVENTS 793 select HAVE_CLK 794 select HAVE_S3C2410_I2C if I2C 795 select HAVE_S3C2410_WATCHDOG if WATCHDOG 796 select HAVE_S3C_RTC if RTC_CLASS 797 select NEED_MACH_GPIO_H 798 select NEED_MACH_MEMORY_H 799 help 800 Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5) 801 802config ARCH_SHARK 803 bool "Shark" 804 select ARCH_USES_GETTIMEOFFSET 805 select CPU_SA110 806 select ISA 807 select ISA_DMA 808 select NEED_MACH_MEMORY_H 809 select PCI 810 select VIRT_TO_BUS 811 select ZONE_DMA 812 help 813 Support for the StrongARM based Digital DNARD machine, also known 814 as "Shark" (<http://www.shark-linux.de/shark.html>). 815 816config ARCH_U300 817 bool "ST-Ericsson U300 Series" 818 depends on MMU 819 select ARCH_REQUIRE_GPIOLIB 820 select ARM_AMBA 821 select ARM_PATCH_PHYS_VIRT 822 select ARM_VIC 823 select CLKDEV_LOOKUP 824 select CLKSRC_MMIO 825 select COMMON_CLK 826 select CPU_ARM926T 827 select GENERIC_CLOCKEVENTS 828 select HAVE_TCM 829 select SPARSE_IRQ 830 help 831 Support for ST-Ericsson U300 series mobile platforms. 832 833config ARCH_DAVINCI 834 bool "TI DaVinci" 835 select ARCH_HAS_HOLES_MEMORYMODEL 836 select ARCH_REQUIRE_GPIOLIB 837 select CLKDEV_LOOKUP 838 select GENERIC_ALLOCATOR 839 select GENERIC_CLOCKEVENTS 840 select GENERIC_IRQ_CHIP 841 select HAVE_IDE 842 select NEED_MACH_GPIO_H 843 select USE_OF 844 select ZONE_DMA 845 help 846 Support for TI's DaVinci platform. 847 848config ARCH_OMAP1 849 bool "TI OMAP1" 850 depends on MMU 851 select ARCH_HAS_CPUFREQ 852 select ARCH_HAS_HOLES_MEMORYMODEL 853 select ARCH_OMAP 854 select ARCH_REQUIRE_GPIOLIB 855 select CLKDEV_LOOKUP 856 select CLKSRC_MMIO 857 select GENERIC_CLOCKEVENTS 858 select GENERIC_IRQ_CHIP 859 select HAVE_CLK 860 select HAVE_IDE 861 select IRQ_DOMAIN 862 select NEED_MACH_IO_H if PCCARD 863 select NEED_MACH_MEMORY_H 864 help 865 Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx) 866 867endchoice 868 869menu "Multiple platform selection" 870 depends on ARCH_MULTIPLATFORM 871 872comment "CPU Core family selection" 873 874config ARCH_MULTI_V4 875 bool "ARMv4 based platforms (FA526, StrongARM)" 876 depends on !ARCH_MULTI_V6_V7 877 select ARCH_MULTI_V4_V5 878 879config ARCH_MULTI_V4T 880 bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" 881 depends on !ARCH_MULTI_V6_V7 882 select ARCH_MULTI_V4_V5 883 884config ARCH_MULTI_V5 885 bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)" 886 depends on !ARCH_MULTI_V6_V7 887 select ARCH_MULTI_V4_V5 888 889config ARCH_MULTI_V4_V5 890 bool 891 892config ARCH_MULTI_V6 893 bool "ARMv6 based platforms (ARM11)" 894 select ARCH_MULTI_V6_V7 895 select CPU_V6 896 897config ARCH_MULTI_V7 898 bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)" 899 default y 900 select ARCH_MULTI_V6_V7 901 select CPU_V7 902 903config ARCH_MULTI_V6_V7 904 bool 905 906config ARCH_MULTI_CPU_AUTO 907 def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7) 908 select ARCH_MULTI_V5 909 910endmenu 911 912# 913# This is sorted alphabetically by mach-* pathname. However, plat-* 914# Kconfigs may be included either alphabetically (according to the 915# plat- suffix) or along side the corresponding mach-* source. 916# 917source "arch/arm/mach-mvebu/Kconfig" 918 919source "arch/arm/mach-at91/Kconfig" 920 921source "arch/arm/mach-bcm/Kconfig" 922 923source "arch/arm/mach-bcm2835/Kconfig" 924 925source "arch/arm/mach-clps711x/Kconfig" 926 927source "arch/arm/mach-cns3xxx/Kconfig" 928 929source "arch/arm/mach-davinci/Kconfig" 930 931source "arch/arm/mach-dove/Kconfig" 932 933source "arch/arm/mach-ep93xx/Kconfig" 934 935source "arch/arm/mach-footbridge/Kconfig" 936 937source "arch/arm/mach-gemini/Kconfig" 938 939source "arch/arm/mach-highbank/Kconfig" 940 941source "arch/arm/mach-integrator/Kconfig" 942 943source "arch/arm/mach-iop32x/Kconfig" 944 945source "arch/arm/mach-iop33x/Kconfig" 946 947source "arch/arm/mach-iop13xx/Kconfig" 948 949source "arch/arm/mach-ixp4xx/Kconfig" 950 951source "arch/arm/mach-kirkwood/Kconfig" 952 953source "arch/arm/mach-ks8695/Kconfig" 954 955source "arch/arm/mach-msm/Kconfig" 956 957source "arch/arm/mach-mv78xx0/Kconfig" 958 959source "arch/arm/mach-imx/Kconfig" 960 961source "arch/arm/mach-mxs/Kconfig" 962 963source "arch/arm/mach-netx/Kconfig" 964 965source "arch/arm/mach-nomadik/Kconfig" 966 967source "arch/arm/plat-omap/Kconfig" 968 969source "arch/arm/mach-omap1/Kconfig" 970 971source "arch/arm/mach-omap2/Kconfig" 972 973source "arch/arm/mach-orion5x/Kconfig" 974 975source "arch/arm/mach-picoxcell/Kconfig" 976 977source "arch/arm/mach-pxa/Kconfig" 978source "arch/arm/plat-pxa/Kconfig" 979 980source "arch/arm/mach-mmp/Kconfig" 981 982source "arch/arm/mach-realview/Kconfig" 983 984source "arch/arm/mach-sa1100/Kconfig" 985 986source "arch/arm/plat-samsung/Kconfig" 987 988source "arch/arm/mach-socfpga/Kconfig" 989 990source "arch/arm/mach-spear/Kconfig" 991 992source "arch/arm/mach-s3c24xx/Kconfig" 993 994if ARCH_S3C64XX 995source "arch/arm/mach-s3c64xx/Kconfig" 996endif 997 998source "arch/arm/mach-s5p64x0/Kconfig" 999 1000source "arch/arm/mach-s5pc100/Kconfig" 1001 1002source "arch/arm/mach-s5pv210/Kconfig" 1003 1004source "arch/arm/mach-exynos/Kconfig" 1005 1006source "arch/arm/mach-shmobile/Kconfig" 1007 1008source "arch/arm/mach-sunxi/Kconfig" 1009 1010source "arch/arm/mach-prima2/Kconfig" 1011 1012source "arch/arm/mach-tegra/Kconfig" 1013 1014source "arch/arm/mach-u300/Kconfig" 1015 1016source "arch/arm/mach-ux500/Kconfig" 1017 1018source "arch/arm/mach-versatile/Kconfig" 1019 1020source "arch/arm/mach-vexpress/Kconfig" 1021source "arch/arm/plat-versatile/Kconfig" 1022 1023source "arch/arm/mach-virt/Kconfig" 1024 1025source "arch/arm/mach-vt8500/Kconfig" 1026 1027source "arch/arm/mach-w90x900/Kconfig" 1028 1029source "arch/arm/mach-zynq/Kconfig" 1030 1031# Definitions to make life easier 1032config ARCH_ACORN 1033 bool 1034 1035config PLAT_IOP 1036 bool 1037 select GENERIC_CLOCKEVENTS 1038 1039config PLAT_ORION 1040 bool 1041 select CLKSRC_MMIO 1042 select COMMON_CLK 1043 select GENERIC_IRQ_CHIP 1044 select IRQ_DOMAIN 1045 1046config PLAT_ORION_LEGACY 1047 bool 1048 select PLAT_ORION 1049 1050config PLAT_PXA 1051 bool 1052 1053config PLAT_VERSATILE 1054 bool 1055 1056config ARM_TIMER_SP804 1057 bool 1058 select CLKSRC_MMIO 1059 select CLKSRC_OF if OF 1060 1061source arch/arm/mm/Kconfig 1062 1063config ARM_NR_BANKS 1064 int 1065 default 16 if ARCH_EP93XX 1066 default 8 1067 1068config IWMMXT 1069 bool "Enable iWMMXt support" if !CPU_PJ4 1070 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 1071 default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 1072 help 1073 Enable support for iWMMXt context switching at run time if 1074 running on a CPU that supports it. 1075 1076config XSCALE_PMU 1077 bool 1078 depends on CPU_XSCALE 1079 default y 1080 1081config MULTI_IRQ_HANDLER 1082 bool 1083 help 1084 Allow each machine to specify it's own IRQ handler at run time. 1085 1086if !MMU 1087source "arch/arm/Kconfig-nommu" 1088endif 1089 1090config ARM_ERRATA_326103 1091 bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory" 1092 depends on CPU_V6 1093 help 1094 Executing a SWP instruction to read-only memory does not set bit 11 1095 of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to 1096 treat the access as a read, preventing a COW from occurring and 1097 causing the faulting task to livelock. 1098 1099config ARM_ERRATA_411920 1100 bool "ARM errata: Invalidation of the Instruction Cache operation can fail" 1101 depends on CPU_V6 || CPU_V6K 1102 help 1103 Invalidation of the Instruction Cache operation can 1104 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176. 1105 It does not affect the MPCore. This option enables the ARM Ltd. 1106 recommended workaround. 1107 1108config ARM_ERRATA_430973 1109 bool "ARM errata: Stale prediction on replaced interworking branch" 1110 depends on CPU_V7 1111 help 1112 This option enables the workaround for the 430973 Cortex-A8 1113 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb 1114 interworking branch is replaced with another code sequence at the 1115 same virtual address, whether due to self-modifying code or virtual 1116 to physical address re-mapping, Cortex-A8 does not recover from the 1117 stale interworking branch prediction. This results in Cortex-A8 1118 executing the new code sequence in the incorrect ARM or Thumb state. 1119 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE 1120 and also flushes the branch target cache at every context switch. 1121 Note that setting specific bits in the ACTLR register may not be 1122 available in non-secure mode. 1123 1124config ARM_ERRATA_458693 1125 bool "ARM errata: Processor deadlock when a false hazard is created" 1126 depends on CPU_V7 1127 depends on !ARCH_MULTIPLATFORM 1128 help 1129 This option enables the workaround for the 458693 Cortex-A8 (r2p0) 1130 erratum. For very specific sequences of memory operations, it is 1131 possible for a hazard condition intended for a cache line to instead 1132 be incorrectly associated with a different cache line. This false 1133 hazard might then cause a processor deadlock. The workaround enables 1134 the L1 caching of the NEON accesses and disables the PLD instruction 1135 in the ACTLR register. Note that setting specific bits in the ACTLR 1136 register may not be available in non-secure mode. 1137 1138config ARM_ERRATA_460075 1139 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data" 1140 depends on CPU_V7 1141 depends on !ARCH_MULTIPLATFORM 1142 help 1143 This option enables the workaround for the 460075 Cortex-A8 (r2p0) 1144 erratum. Any asynchronous access to the L2 cache may encounter a 1145 situation in which recent store transactions to the L2 cache are lost 1146 and overwritten with stale memory contents from external memory. The 1147 workaround disables the write-allocate mode for the L2 cache via the 1148 ACTLR register. Note that setting specific bits in the ACTLR register 1149 may not be available in non-secure mode. 1150 1151config ARM_ERRATA_742230 1152 bool "ARM errata: DMB operation may be faulty" 1153 depends on CPU_V7 && SMP 1154 depends on !ARCH_MULTIPLATFORM 1155 help 1156 This option enables the workaround for the 742230 Cortex-A9 1157 (r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction 1158 between two write operations may not ensure the correct visibility 1159 ordering of the two writes. This workaround sets a specific bit in 1160 the diagnostic register of the Cortex-A9 which causes the DMB 1161 instruction to behave as a DSB, ensuring the correct behaviour of 1162 the two writes. 1163 1164config ARM_ERRATA_742231 1165 bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption" 1166 depends on CPU_V7 && SMP 1167 depends on !ARCH_MULTIPLATFORM 1168 help 1169 This option enables the workaround for the 742231 Cortex-A9 1170 (r2p0..r2p2) erratum. Under certain conditions, specific to the 1171 Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode, 1172 accessing some data located in the same cache line, may get corrupted 1173 data due to bad handling of the address hazard when the line gets 1174 replaced from one of the CPUs at the same time as another CPU is 1175 accessing it. This workaround sets specific bits in the diagnostic 1176 register of the Cortex-A9 which reduces the linefill issuing 1177 capabilities of the processor. 1178 1179config PL310_ERRATA_588369 1180 bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines" 1181 depends on CACHE_L2X0 1182 help 1183 The PL310 L2 cache controller implements three types of Clean & 1184 Invalidate maintenance operations: by Physical Address 1185 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC). 1186 They are architecturally defined to behave as the execution of a 1187 clean operation followed immediately by an invalidate operation, 1188 both performing to the same memory location. This functionality 1189 is not correctly implemented in PL310 as clean lines are not 1190 invalidated as a result of these operations. 1191 1192config ARM_ERRATA_643719 1193 bool "ARM errata: LoUIS bit field in CLIDR register is incorrect" 1194 depends on CPU_V7 && SMP 1195 help 1196 This option enables the workaround for the 643719 Cortex-A9 (prior to 1197 r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR 1198 register returns zero when it should return one. The workaround 1199 corrects this value, ensuring cache maintenance operations which use 1200 it behave as intended and avoiding data corruption. 1201 1202config ARM_ERRATA_720789 1203 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" 1204 depends on CPU_V7 1205 help 1206 This option enables the workaround for the 720789 Cortex-A9 (prior to 1207 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the 1208 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. 1209 As a consequence of this erratum, some TLB entries which should be 1210 invalidated are not, resulting in an incoherency in the system page 1211 tables. The workaround changes the TLB flushing routines to invalidate 1212 entries regardless of the ASID. 1213 1214config PL310_ERRATA_727915 1215 bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption" 1216 depends on CACHE_L2X0 1217 help 1218 PL310 implements the Clean & Invalidate by Way L2 cache maintenance 1219 operation (offset 0x7FC). This operation runs in background so that 1220 PL310 can handle normal accesses while it is in progress. Under very 1221 rare circumstances, due to this erratum, write data can be lost when 1222 PL310 treats a cacheable write transaction during a Clean & 1223 Invalidate by Way operation. 1224 1225config ARM_ERRATA_743622 1226 bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption" 1227 depends on CPU_V7 1228 depends on !ARCH_MULTIPLATFORM 1229 help 1230 This option enables the workaround for the 743622 Cortex-A9 1231 (r2p*) erratum. Under very rare conditions, a faulty 1232 optimisation in the Cortex-A9 Store Buffer may lead to data 1233 corruption. This workaround sets a specific bit in the diagnostic 1234 register of the Cortex-A9 which disables the Store Buffer 1235 optimisation, preventing the defect from occurring. This has no 1236 visible impact on the overall performance or power consumption of the 1237 processor. 1238 1239config ARM_ERRATA_751472 1240 bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation" 1241 depends on CPU_V7 1242 depends on !ARCH_MULTIPLATFORM 1243 help 1244 This option enables the workaround for the 751472 Cortex-A9 (prior 1245 to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the 1246 completion of a following broadcasted operation if the second 1247 operation is received by a CPU before the ICIALLUIS has completed, 1248 potentially leading to corrupted entries in the cache or TLB. 1249 1250config PL310_ERRATA_753970 1251 bool "PL310 errata: cache sync operation may be faulty" 1252 depends on CACHE_PL310 1253 help 1254 This option enables the workaround for the 753970 PL310 (r3p0) erratum. 1255 1256 Under some condition the effect of cache sync operation on 1257 the store buffer still remains when the operation completes. 1258 This means that the store buffer is always asked to drain and 1259 this prevents it from merging any further writes. The workaround 1260 is to replace the normal offset of cache sync operation (0x730) 1261 by another offset targeting an unmapped PL310 register 0x740. 1262 This has the same effect as the cache sync operation: store buffer 1263 drain and waiting for all buffers empty. 1264 1265config ARM_ERRATA_754322 1266 bool "ARM errata: possible faulty MMU translations following an ASID switch" 1267 depends on CPU_V7 1268 help 1269 This option enables the workaround for the 754322 Cortex-A9 (r2p*, 1270 r3p*) erratum. A speculative memory access may cause a page table walk 1271 which starts prior to an ASID switch but completes afterwards. This 1272 can populate the micro-TLB with a stale entry which may be hit with 1273 the new ASID. This workaround places two dsb instructions in the mm 1274 switching code so that no page table walks can cross the ASID switch. 1275 1276config ARM_ERRATA_754327 1277 bool "ARM errata: no automatic Store Buffer drain" 1278 depends on CPU_V7 && SMP 1279 help 1280 This option enables the workaround for the 754327 Cortex-A9 (prior to 1281 r2p0) erratum. The Store Buffer does not have any automatic draining 1282 mechanism and therefore a livelock may occur if an external agent 1283 continuously polls a memory location waiting to observe an update. 1284 This workaround defines cpu_relax() as smp_mb(), preventing correctly 1285 written polling loops from denying visibility of updates to memory. 1286 1287config ARM_ERRATA_364296 1288 bool "ARM errata: Possible cache data corruption with hit-under-miss enabled" 1289 depends on CPU_V6 && !SMP 1290 help 1291 This options enables the workaround for the 364296 ARM1136 1292 r0p2 erratum (possible cache data corruption with 1293 hit-under-miss enabled). It sets the undocumented bit 31 in 1294 the auxiliary control register and the FI bit in the control 1295 register, thus disabling hit-under-miss without putting the 1296 processor into full low interrupt latency mode. ARM11MPCore 1297 is not affected. 1298 1299config ARM_ERRATA_764369 1300 bool "ARM errata: Data cache line maintenance operation by MVA may not succeed" 1301 depends on CPU_V7 && SMP 1302 help 1303 This option enables the workaround for erratum 764369 1304 affecting Cortex-A9 MPCore with two or more processors (all 1305 current revisions). Under certain timing circumstances, a data 1306 cache line maintenance operation by MVA targeting an Inner 1307 Shareable memory region may fail to proceed up to either the 1308 Point of Coherency or to the Point of Unification of the 1309 system. This workaround adds a DSB instruction before the 1310 relevant cache maintenance functions and sets a specific bit 1311 in the diagnostic control register of the SCU. 1312 1313config PL310_ERRATA_769419 1314 bool "PL310 errata: no automatic Store Buffer drain" 1315 depends on CACHE_L2X0 1316 help 1317 On revisions of the PL310 prior to r3p2, the Store Buffer does 1318 not automatically drain. This can cause normal, non-cacheable 1319 writes to be retained when the memory system is idle, leading 1320 to suboptimal I/O performance for drivers using coherent DMA. 1321 This option adds a write barrier to the cpu_idle loop so that, 1322 on systems with an outer cache, the store buffer is drained 1323 explicitly. 1324 1325config ARM_ERRATA_775420 1326 bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock" 1327 depends on CPU_V7 1328 help 1329 This option enables the workaround for the 775420 Cortex-A9 (r2p2, 1330 r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance 1331 operation aborts with MMU exception, it might cause the processor 1332 to deadlock. This workaround puts DSB before executing ISB if 1333 an abort may occur on cache maintenance. 1334 1335config ARM_ERRATA_798181 1336 bool "ARM errata: TLBI/DSB failure on Cortex-A15" 1337 depends on CPU_V7 && SMP 1338 help 1339 On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not 1340 adequately shooting down all use of the old entries. This 1341 option enables the Linux kernel workaround for this erratum 1342 which sends an IPI to the CPUs that are running the same ASID 1343 as the one being invalidated. 1344 1345endmenu 1346 1347source "arch/arm/common/Kconfig" 1348 1349menu "Bus support" 1350 1351config ARM_AMBA 1352 bool 1353 1354config ISA 1355 bool 1356 help 1357 Find out whether you have ISA slots on your motherboard. ISA is the 1358 name of a bus system, i.e. the way the CPU talks to the other stuff 1359 inside your box. Other bus systems are PCI, EISA, MicroChannel 1360 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 1361 newer boards don't support it. If you have ISA, say Y, otherwise N. 1362 1363# Select ISA DMA controller support 1364config ISA_DMA 1365 bool 1366 select ISA_DMA_API 1367 1368# Select ISA DMA interface 1369config ISA_DMA_API 1370 bool 1371 1372config PCI 1373 bool "PCI support" if MIGHT_HAVE_PCI 1374 help 1375 Find out whether you have a PCI motherboard. PCI is the name of a 1376 bus system, i.e. the way the CPU talks to the other stuff inside 1377 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 1378 VESA. If you have PCI, say Y, otherwise N. 1379 1380config PCI_DOMAINS 1381 bool 1382 depends on PCI 1383 1384config PCI_NANOENGINE 1385 bool "BSE nanoEngine PCI support" 1386 depends on SA1100_NANOENGINE 1387 help 1388 Enable PCI on the BSE nanoEngine board. 1389 1390config PCI_SYSCALL 1391 def_bool PCI 1392 1393# Select the host bridge type 1394config PCI_HOST_VIA82C505 1395 bool 1396 depends on PCI && ARCH_SHARK 1397 default y 1398 1399config PCI_HOST_ITE8152 1400 bool 1401 depends on PCI && MACH_ARMCORE 1402 default y 1403 select DMABOUNCE 1404 1405source "drivers/pci/Kconfig" 1406 1407source "drivers/pcmcia/Kconfig" 1408 1409endmenu 1410 1411menu "Kernel Features" 1412 1413config HAVE_SMP 1414 bool 1415 help 1416 This option should be selected by machines which have an SMP- 1417 capable CPU. 1418 1419 The only effect of this option is to make the SMP-related 1420 options available to the user for configuration. 1421 1422config SMP 1423 bool "Symmetric Multi-Processing" 1424 depends on CPU_V6K || CPU_V7 1425 depends on GENERIC_CLOCKEVENTS 1426 depends on HAVE_SMP 1427 depends on MMU 1428 select USE_GENERIC_SMP_HELPERS 1429 help 1430 This enables support for systems with more than one CPU. If you have 1431 a system with only one CPU, like most personal computers, say N. If 1432 you have a system with more than one CPU, say Y. 1433 1434 If you say N here, the kernel will run on single and multiprocessor 1435 machines, but will use only one CPU of a multiprocessor machine. If 1436 you say Y here, the kernel will run on many, but not all, single 1437 processor machines. On a single processor machine, the kernel will 1438 run faster if you say N here. 1439 1440 See also <file:Documentation/x86/i386/IO-APIC.txt>, 1441 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 1442 <http://tldp.org/HOWTO/SMP-HOWTO.html>. 1443 1444 If you don't know what to do here, say N. 1445 1446config SMP_ON_UP 1447 bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)" 1448 depends on SMP && !XIP_KERNEL 1449 default y 1450 help 1451 SMP kernels contain instructions which fail on non-SMP processors. 1452 Enabling this option allows the kernel to modify itself to make 1453 these instructions safe. Disabling it allows about 1K of space 1454 savings. 1455 1456 If you don't know what to do here, say Y. 1457 1458config ARM_CPU_TOPOLOGY 1459 bool "Support cpu topology definition" 1460 depends on SMP && CPU_V7 1461 default y 1462 help 1463 Support ARM cpu topology definition. The MPIDR register defines 1464 affinity between processors which is then used to describe the cpu 1465 topology of an ARM System. 1466 1467config SCHED_MC 1468 bool "Multi-core scheduler support" 1469 depends on ARM_CPU_TOPOLOGY 1470 help 1471 Multi-core scheduler support improves the CPU scheduler's decision 1472 making when dealing with multi-core CPU chips at a cost of slightly 1473 increased overhead in some places. If unsure say N here. 1474 1475config SCHED_SMT 1476 bool "SMT scheduler support" 1477 depends on ARM_CPU_TOPOLOGY 1478 help 1479 Improves the CPU scheduler's decision making when dealing with 1480 MultiThreading at a cost of slightly increased overhead in some 1481 places. If unsure say N here. 1482 1483config HAVE_ARM_SCU 1484 bool 1485 help 1486 This option enables support for the ARM system coherency unit 1487 1488config HAVE_ARM_ARCH_TIMER 1489 bool "Architected timer support" 1490 depends on CPU_V7 1491 select ARM_ARCH_TIMER 1492 help 1493 This option enables support for the ARM architected timer 1494 1495config HAVE_ARM_TWD 1496 bool 1497 depends on SMP 1498 select CLKSRC_OF if OF 1499 help 1500 This options enables support for the ARM timer and watchdog unit 1501 1502config MCPM 1503 bool "Multi-Cluster Power Management" 1504 depends on CPU_V7 && SMP 1505 help 1506 This option provides the common power management infrastructure 1507 for (multi-)cluster based systems, such as big.LITTLE based 1508 systems. 1509 1510choice 1511 prompt "Memory split" 1512 default VMSPLIT_3G 1513 help 1514 Select the desired split between kernel and user memory. 1515 1516 If you are not absolutely sure what you are doing, leave this 1517 option alone! 1518 1519 config VMSPLIT_3G 1520 bool "3G/1G user/kernel split" 1521 config VMSPLIT_2G 1522 bool "2G/2G user/kernel split" 1523 config VMSPLIT_1G 1524 bool "1G/3G user/kernel split" 1525endchoice 1526 1527config PAGE_OFFSET 1528 hex 1529 default 0x40000000 if VMSPLIT_1G 1530 default 0x80000000 if VMSPLIT_2G 1531 default 0xC0000000 1532 1533config NR_CPUS 1534 int "Maximum number of CPUs (2-32)" 1535 range 2 32 1536 depends on SMP 1537 default "4" 1538 1539config HOTPLUG_CPU 1540 bool "Support for hot-pluggable CPUs" 1541 depends on SMP && HOTPLUG 1542 help 1543 Say Y here to experiment with turning CPUs off and on. CPUs 1544 can be controlled through /sys/devices/system/cpu. 1545 1546config ARM_PSCI 1547 bool "Support for the ARM Power State Coordination Interface (PSCI)" 1548 depends on CPU_V7 1549 help 1550 Say Y here if you want Linux to communicate with system firmware 1551 implementing the PSCI specification for CPU-centric power 1552 management operations described in ARM document number ARM DEN 1553 0022A ("Power State Coordination Interface System Software on 1554 ARM processors"). 1555 1556config LOCAL_TIMERS 1557 bool "Use local timer interrupts" 1558 depends on SMP 1559 default y 1560 help 1561 Enable support for local timers on SMP platforms, rather then the 1562 legacy IPI broadcast method. Local timers allows the system 1563 accounting to be spread across the timer interval, preventing a 1564 "thundering herd" at every timer tick. 1565 1566# The GPIO number here must be sorted by descending number. In case of 1567# a multiplatform kernel, we just want the highest value required by the 1568# selected platforms. 1569config ARCH_NR_GPIO 1570 int 1571 default 1024 if ARCH_SHMOBILE || ARCH_TEGRA 1572 default 512 if SOC_OMAP5 1573 default 392 if ARCH_U8500 1574 default 352 if ARCH_VT8500 1575 default 288 if ARCH_SUNXI 1576 default 264 if MACH_H4700 1577 default 0 1578 help 1579 Maximum number of GPIOs in the system. 1580 1581 If unsure, leave the default value. 1582 1583source kernel/Kconfig.preempt 1584 1585config HZ 1586 int 1587 default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \ 1588 ARCH_S5PV210 || ARCH_EXYNOS4 1589 default AT91_TIMER_HZ if ARCH_AT91 1590 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE 1591 default 100 1592 1593config SCHED_HRTICK 1594 def_bool HIGH_RES_TIMERS 1595 1596config THUMB2_KERNEL 1597 bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY 1598 depends on CPU_V7 && !CPU_V6 && !CPU_V6K 1599 default y if CPU_THUMBONLY 1600 select AEABI 1601 select ARM_ASM_UNIFIED 1602 select ARM_UNWIND 1603 help 1604 By enabling this option, the kernel will be compiled in 1605 Thumb-2 mode. A compiler/assembler that understand the unified 1606 ARM-Thumb syntax is needed. 1607 1608 If unsure, say N. 1609 1610config THUMB2_AVOID_R_ARM_THM_JUMP11 1611 bool "Work around buggy Thumb-2 short branch relocations in gas" 1612 depends on THUMB2_KERNEL && MODULES 1613 default y 1614 help 1615 Various binutils versions can resolve Thumb-2 branches to 1616 locally-defined, preemptible global symbols as short-range "b.n" 1617 branch instructions. 1618 1619 This is a problem, because there's no guarantee the final 1620 destination of the symbol, or any candidate locations for a 1621 trampoline, are within range of the branch. For this reason, the 1622 kernel does not support fixing up the R_ARM_THM_JUMP11 (102) 1623 relocation in modules at all, and it makes little sense to add 1624 support. 1625 1626 The symptom is that the kernel fails with an "unsupported 1627 relocation" error when loading some modules. 1628 1629 Until fixed tools are available, passing 1630 -fno-optimize-sibling-calls to gcc should prevent gcc generating 1631 code which hits this problem, at the cost of a bit of extra runtime 1632 stack usage in some cases. 1633 1634 The problem is described in more detail at: 1635 https://bugs.launchpad.net/binutils-linaro/+bug/725126 1636 1637 Only Thumb-2 kernels are affected. 1638 1639 Unless you are sure your tools don't have this problem, say Y. 1640 1641config ARM_ASM_UNIFIED 1642 bool 1643 1644config AEABI 1645 bool "Use the ARM EABI to compile the kernel" 1646 help 1647 This option allows for the kernel to be compiled using the latest 1648 ARM ABI (aka EABI). This is only useful if you are using a user 1649 space environment that is also compiled with EABI. 1650 1651 Since there are major incompatibilities between the legacy ABI and 1652 EABI, especially with regard to structure member alignment, this 1653 option also changes the kernel syscall calling convention to 1654 disambiguate both ABIs and allow for backward compatibility support 1655 (selected with CONFIG_OABI_COMPAT). 1656 1657 To use this you need GCC version 4.0.0 or later. 1658 1659config OABI_COMPAT 1660 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 1661 depends on AEABI && !THUMB2_KERNEL 1662 default y 1663 help 1664 This option preserves the old syscall interface along with the 1665 new (ARM EABI) one. It also provides a compatibility layer to 1666 intercept syscalls that have structure arguments which layout 1667 in memory differs between the legacy ABI and the new ARM EABI 1668 (only for non "thumb" binaries). This option adds a tiny 1669 overhead to all syscalls and produces a slightly larger kernel. 1670 If you know you'll be using only pure EABI user space then you 1671 can say N here. If this option is not selected and you attempt 1672 to execute a legacy ABI binary then the result will be 1673 UNPREDICTABLE (in fact it can be predicted that it won't work 1674 at all). If in doubt say Y. 1675 1676config ARCH_HAS_HOLES_MEMORYMODEL 1677 bool 1678 1679config ARCH_SPARSEMEM_ENABLE 1680 bool 1681 1682config ARCH_SPARSEMEM_DEFAULT 1683 def_bool ARCH_SPARSEMEM_ENABLE 1684 1685config ARCH_SELECT_MEMORY_MODEL 1686 def_bool ARCH_SPARSEMEM_ENABLE 1687 1688config HAVE_ARCH_PFN_VALID 1689 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM 1690 1691config HIGHMEM 1692 bool "High Memory Support" 1693 depends on MMU 1694 help 1695 The address space of ARM processors is only 4 Gigabytes large 1696 and it has to accommodate user address space, kernel address 1697 space as well as some memory mapped IO. That means that, if you 1698 have a large amount of physical memory and/or IO, not all of the 1699 memory can be "permanently mapped" by the kernel. The physical 1700 memory that is not permanently mapped is called "high memory". 1701 1702 Depending on the selected kernel/user memory split, minimum 1703 vmalloc space and actual amount of RAM, you may not need this 1704 option which should result in a slightly faster kernel. 1705 1706 If unsure, say n. 1707 1708config HIGHPTE 1709 bool "Allocate 2nd-level pagetables from highmem" 1710 depends on HIGHMEM 1711 1712config HW_PERF_EVENTS 1713 bool "Enable hardware performance counter support for perf events" 1714 depends on PERF_EVENTS 1715 default y 1716 help 1717 Enable hardware performance counter support for perf events. If 1718 disabled, perf events will use software events only. 1719 1720source "mm/Kconfig" 1721 1722config FORCE_MAX_ZONEORDER 1723 int "Maximum zone order" if ARCH_SHMOBILE 1724 range 11 64 if ARCH_SHMOBILE 1725 default "12" if SOC_AM33XX 1726 default "9" if SA1111 1727 default "11" 1728 help 1729 The kernel memory allocator divides physically contiguous memory 1730 blocks into "zones", where each zone is a power of two number of 1731 pages. This option selects the largest power of two that the kernel 1732 keeps in the memory allocator. If you need to allocate very large 1733 blocks of physically contiguous memory, then you may need to 1734 increase this value. 1735 1736 This config option is actually maximum order plus one. For example, 1737 a value of 11 means that the largest free memory block is 2^10 pages. 1738 1739config ALIGNMENT_TRAP 1740 bool 1741 depends on CPU_CP15_MMU 1742 default y if !ARCH_EBSA110 1743 select HAVE_PROC_CPU if PROC_FS 1744 help 1745 ARM processors cannot fetch/store information which is not 1746 naturally aligned on the bus, i.e., a 4 byte fetch must start at an 1747 address divisible by 4. On 32-bit ARM processors, these non-aligned 1748 fetch/store instructions will be emulated in software if you say 1749 here, which has a severe performance impact. This is necessary for 1750 correct operation of some network protocols. With an IP-only 1751 configuration it is safe to say N, otherwise say Y. 1752 1753config UACCESS_WITH_MEMCPY 1754 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()" 1755 depends on MMU 1756 default y if CPU_FEROCEON 1757 help 1758 Implement faster copy_to_user and clear_user methods for CPU 1759 cores where a 8-word STM instruction give significantly higher 1760 memory write throughput than a sequence of individual 32bit stores. 1761 1762 A possible side effect is a slight increase in scheduling latency 1763 between threads sharing the same address space if they invoke 1764 such copy operations with large buffers. 1765 1766 However, if the CPU data cache is using a write-allocate mode, 1767 this option is unlikely to provide any performance gain. 1768 1769config SECCOMP 1770 bool 1771 prompt "Enable seccomp to safely compute untrusted bytecode" 1772 ---help--- 1773 This kernel feature is useful for number crunching applications 1774 that may need to compute untrusted bytecode during their 1775 execution. By using pipes or other transports made available to 1776 the process as file descriptors supporting the read/write 1777 syscalls, it's possible to isolate those applications in 1778 their own address space using seccomp. Once seccomp is 1779 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled 1780 and the task is only allowed to execute a few safe syscalls 1781 defined by each seccomp mode. 1782 1783config CC_STACKPROTECTOR 1784 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" 1785 help 1786 This option turns on the -fstack-protector GCC feature. This 1787 feature puts, at the beginning of functions, a canary value on 1788 the stack just before the return address, and validates 1789 the value just before actually returning. Stack based buffer 1790 overflows (that need to overwrite this return address) now also 1791 overwrite the canary, which gets detected and the attack is then 1792 neutralized via a kernel panic. 1793 This feature requires gcc version 4.2 or above. 1794 1795config XEN_DOM0 1796 def_bool y 1797 depends on XEN 1798 1799config XEN 1800 bool "Xen guest support on ARM (EXPERIMENTAL)" 1801 depends on ARM && AEABI && OF 1802 depends on CPU_V7 && !CPU_V6 1803 depends on !GENERIC_ATOMIC64 1804 select ARM_PSCI 1805 help 1806 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM. 1807 1808endmenu 1809 1810menu "Boot options" 1811 1812config USE_OF 1813 bool "Flattened Device Tree support" 1814 select IRQ_DOMAIN 1815 select OF 1816 select OF_EARLY_FLATTREE 1817 help 1818 Include support for flattened device tree machine descriptions. 1819 1820config ATAGS 1821 bool "Support for the traditional ATAGS boot data passing" if USE_OF 1822 default y 1823 help 1824 This is the traditional way of passing data to the kernel at boot 1825 time. If you are solely relying on the flattened device tree (or 1826 the ARM_ATAG_DTB_COMPAT option) then you may unselect this option 1827 to remove ATAGS support from your kernel binary. If unsure, 1828 leave this to y. 1829 1830config DEPRECATED_PARAM_STRUCT 1831 bool "Provide old way to pass kernel parameters" 1832 depends on ATAGS 1833 help 1834 This was deprecated in 2001 and announced to live on for 5 years. 1835 Some old boot loaders still use this way. 1836 1837# Compressed boot loader in ROM. Yes, we really want to ask about 1838# TEXT and BSS so we preserve their values in the config files. 1839config ZBOOT_ROM_TEXT 1840 hex "Compressed ROM boot loader base address" 1841 default "0" 1842 help 1843 The physical address at which the ROM-able zImage is to be 1844 placed in the target. Platforms which normally make use of 1845 ROM-able zImage formats normally set this to a suitable 1846 value in their defconfig file. 1847 1848 If ZBOOT_ROM is not enabled, this has no effect. 1849 1850config ZBOOT_ROM_BSS 1851 hex "Compressed ROM boot loader BSS address" 1852 default "0" 1853 help 1854 The base address of an area of read/write memory in the target 1855 for the ROM-able zImage which must be available while the 1856 decompressor is running. It must be large enough to hold the 1857 entire decompressed kernel plus an additional 128 KiB. 1858 Platforms which normally make use of ROM-able zImage formats 1859 normally set this to a suitable value in their defconfig file. 1860 1861 If ZBOOT_ROM is not enabled, this has no effect. 1862 1863config ZBOOT_ROM 1864 bool "Compressed boot loader in ROM/flash" 1865 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 1866 help 1867 Say Y here if you intend to execute your compressed kernel image 1868 (zImage) directly from ROM or flash. If unsure, say N. 1869 1870choice 1871 prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)" 1872 depends on ZBOOT_ROM && ARCH_SH7372 1873 default ZBOOT_ROM_NONE 1874 help 1875 Include experimental SD/MMC loading code in the ROM-able zImage. 1876 With this enabled it is possible to write the ROM-able zImage 1877 kernel image to an MMC or SD card and boot the kernel straight 1878 from the reset vector. At reset the processor Mask ROM will load 1879 the first part of the ROM-able zImage which in turn loads the 1880 rest the kernel image to RAM. 1881 1882config ZBOOT_ROM_NONE 1883 bool "No SD/MMC loader in zImage (EXPERIMENTAL)" 1884 help 1885 Do not load image from SD or MMC 1886 1887config ZBOOT_ROM_MMCIF 1888 bool "Include MMCIF loader in zImage (EXPERIMENTAL)" 1889 help 1890 Load image from MMCIF hardware block. 1891 1892config ZBOOT_ROM_SH_MOBILE_SDHI 1893 bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)" 1894 help 1895 Load image from SDHI hardware block 1896 1897endchoice 1898 1899config ARM_APPENDED_DTB 1900 bool "Use appended device tree blob to zImage (EXPERIMENTAL)" 1901 depends on OF && !ZBOOT_ROM 1902 help 1903 With this option, the boot code will look for a device tree binary 1904 (DTB) appended to zImage 1905 (e.g. cat zImage <filename>.dtb > zImage_w_dtb). 1906 1907 This is meant as a backward compatibility convenience for those 1908 systems with a bootloader that can't be upgraded to accommodate 1909 the documented boot protocol using a device tree. 1910 1911 Beware that there is very little in terms of protection against 1912 this option being confused by leftover garbage in memory that might 1913 look like a DTB header after a reboot if no actual DTB is appended 1914 to zImage. Do not leave this option active in a production kernel 1915 if you don't intend to always append a DTB. Proper passing of the 1916 location into r2 of a bootloader provided DTB is always preferable 1917 to this option. 1918 1919config ARM_ATAG_DTB_COMPAT 1920 bool "Supplement the appended DTB with traditional ATAG information" 1921 depends on ARM_APPENDED_DTB 1922 help 1923 Some old bootloaders can't be updated to a DTB capable one, yet 1924 they provide ATAGs with memory configuration, the ramdisk address, 1925 the kernel cmdline string, etc. Such information is dynamically 1926 provided by the bootloader and can't always be stored in a static 1927 DTB. To allow a device tree enabled kernel to be used with such 1928 bootloaders, this option allows zImage to extract the information 1929 from the ATAG list and store it at run time into the appended DTB. 1930 1931choice 1932 prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT 1933 default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1934 1935config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER 1936 bool "Use bootloader kernel arguments if available" 1937 help 1938 Uses the command-line options passed by the boot loader instead of 1939 the device tree bootargs property. If the boot loader doesn't provide 1940 any, the device tree bootargs property will be used. 1941 1942config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND 1943 bool "Extend with bootloader kernel arguments" 1944 help 1945 The command-line arguments provided by the boot loader will be 1946 appended to the the device tree bootargs property. 1947 1948endchoice 1949 1950config CMDLINE 1951 string "Default kernel command string" 1952 default "" 1953 help 1954 On some architectures (EBSA110 and CATS), there is currently no way 1955 for the boot loader to pass arguments to the kernel. For these 1956 architectures, you should supply some command-line options at build 1957 time by entering them here. As a minimum, you should specify the 1958 memory size and the root device (e.g., mem=64M root=/dev/nfs). 1959 1960choice 1961 prompt "Kernel command line type" if CMDLINE != "" 1962 default CMDLINE_FROM_BOOTLOADER 1963 depends on ATAGS 1964 1965config CMDLINE_FROM_BOOTLOADER 1966 bool "Use bootloader kernel arguments if available" 1967 help 1968 Uses the command-line options passed by the boot loader. If 1969 the boot loader doesn't provide any, the default kernel command 1970 string provided in CMDLINE will be used. 1971 1972config CMDLINE_EXTEND 1973 bool "Extend bootloader kernel arguments" 1974 help 1975 The command-line arguments provided by the boot loader will be 1976 appended to the default kernel command string. 1977 1978config CMDLINE_FORCE 1979 bool "Always use the default kernel command string" 1980 help 1981 Always use the default kernel command string, even if the boot 1982 loader passes other arguments to the kernel. 1983 This is useful if you cannot or don't want to change the 1984 command-line options your boot loader passes to the kernel. 1985endchoice 1986 1987config XIP_KERNEL 1988 bool "Kernel Execute-In-Place from ROM" 1989 depends on !ZBOOT_ROM && !ARM_LPAE && !ARCH_MULTIPLATFORM 1990 help 1991 Execute-In-Place allows the kernel to run from non-volatile storage 1992 directly addressable by the CPU, such as NOR flash. This saves RAM 1993 space since the text section of the kernel is not loaded from flash 1994 to RAM. Read-write sections, such as the data section and stack, 1995 are still copied to RAM. The XIP kernel is not compressed since 1996 it has to run directly from flash, so it will take more space to 1997 store it. The flash address used to link the kernel object files, 1998 and for storing it, is configuration dependent. Therefore, if you 1999 say Y here, you must know the proper physical address where to 2000 store the kernel image depending on your own flash memory usage. 2001 2002 Also note that the make target becomes "make xipImage" rather than 2003 "make zImage" or "make Image". The final kernel binary to put in 2004 ROM memory will be arch/arm/boot/xipImage. 2005 2006 If unsure, say N. 2007 2008config XIP_PHYS_ADDR 2009 hex "XIP Kernel Physical Location" 2010 depends on XIP_KERNEL 2011 default "0x00080000" 2012 help 2013 This is the physical address in your flash memory the kernel will 2014 be linked for and stored to. This address is dependent on your 2015 own flash usage. 2016 2017config KEXEC 2018 bool "Kexec system call (EXPERIMENTAL)" 2019 depends on (!SMP || PM_SLEEP_SMP) 2020 help 2021 kexec is a system call that implements the ability to shutdown your 2022 current kernel, and to start another kernel. It is like a reboot 2023 but it is independent of the system firmware. And like a reboot 2024 you can start any kernel with it, not just Linux. 2025 2026 It is an ongoing process to be certain the hardware in a machine 2027 is properly shutdown, so do not be surprised if this code does not 2028 initially work for you. It may help to enable device hotplugging 2029 support. 2030 2031config ATAGS_PROC 2032 bool "Export atags in procfs" 2033 depends on ATAGS && KEXEC 2034 default y 2035 help 2036 Should the atags used to boot the kernel be exported in an "atags" 2037 file in procfs. Useful with kexec. 2038 2039config CRASH_DUMP 2040 bool "Build kdump crash kernel (EXPERIMENTAL)" 2041 help 2042 Generate crash dump after being started by kexec. This should 2043 be normally only set in special crash dump kernels which are 2044 loaded in the main kernel with kexec-tools into a specially 2045 reserved region and then later executed after a crash by 2046 kdump/kexec. The crash dump kernel must be compiled to a 2047 memory address not used by the main kernel 2048 2049 For more details see Documentation/kdump/kdump.txt 2050 2051config AUTO_ZRELADDR 2052 bool "Auto calculation of the decompressed kernel image address" 2053 depends on !ZBOOT_ROM && !ARCH_U300 2054 help 2055 ZRELADDR is the physical address where the decompressed kernel 2056 image will be placed. If AUTO_ZRELADDR is selected, the address 2057 will be determined at run-time by masking the current IP with 2058 0xf8000000. This assumes the zImage being placed in the first 128MB 2059 from start of memory. 2060 2061endmenu 2062 2063menu "CPU Power Management" 2064 2065if ARCH_HAS_CPUFREQ 2066source "drivers/cpufreq/Kconfig" 2067 2068config CPU_FREQ_S3C 2069 bool 2070 help 2071 Internal configuration node for common cpufreq on Samsung SoC 2072 2073config CPU_FREQ_S3C24XX 2074 bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)" 2075 depends on ARCH_S3C24XX && CPU_FREQ 2076 select CPU_FREQ_S3C 2077 help 2078 This enables the CPUfreq driver for the Samsung S3C24XX family 2079 of CPUs. 2080 2081 For details, take a look at <file:Documentation/cpu-freq>. 2082 2083 If in doubt, say N. 2084 2085config CPU_FREQ_S3C24XX_PLL 2086 bool "Support CPUfreq changing of PLL frequency (EXPERIMENTAL)" 2087 depends on CPU_FREQ_S3C24XX 2088 help 2089 Compile in support for changing the PLL frequency from the 2090 S3C24XX series CPUfreq driver. The PLL takes time to settle 2091 after a frequency change, so by default it is not enabled. 2092 2093 This also means that the PLL tables for the selected CPU(s) will 2094 be built which may increase the size of the kernel image. 2095 2096config CPU_FREQ_S3C24XX_DEBUG 2097 bool "Debug CPUfreq Samsung driver core" 2098 depends on CPU_FREQ_S3C24XX 2099 help 2100 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core 2101 2102config CPU_FREQ_S3C24XX_IODEBUG 2103 bool "Debug CPUfreq Samsung driver IO timing" 2104 depends on CPU_FREQ_S3C24XX 2105 help 2106 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core 2107 2108config CPU_FREQ_S3C24XX_DEBUGFS 2109 bool "Export debugfs for CPUFreq" 2110 depends on CPU_FREQ_S3C24XX && DEBUG_FS 2111 help 2112 Export status information via debugfs. 2113 2114endif 2115 2116source "drivers/cpuidle/Kconfig" 2117 2118endmenu 2119 2120menu "Floating point emulation" 2121 2122comment "At least one emulation must be selected" 2123 2124config FPE_NWFPE 2125 bool "NWFPE math emulation" 2126 depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL 2127 ---help--- 2128 Say Y to include the NWFPE floating point emulator in the kernel. 2129 This is necessary to run most binaries. Linux does not currently 2130 support floating point hardware so you need to say Y here even if 2131 your machine has an FPA or floating point co-processor podule. 2132 2133 You may say N here if you are going to load the Acorn FPEmulator 2134 early in the bootup. 2135 2136config FPE_NWFPE_XP 2137 bool "Support extended precision" 2138 depends on FPE_NWFPE 2139 help 2140 Say Y to include 80-bit support in the kernel floating-point 2141 emulator. Otherwise, only 32 and 64-bit support is compiled in. 2142 Note that gcc does not generate 80-bit operations by default, 2143 so in most cases this option only enlarges the size of the 2144 floating point emulator without any good reason. 2145 2146 You almost surely want to say N here. 2147 2148config FPE_FASTFPE 2149 bool "FastFPE math emulation (EXPERIMENTAL)" 2150 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 2151 ---help--- 2152 Say Y here to include the FAST floating point emulator in the kernel. 2153 This is an experimental much faster emulator which now also has full 2154 precision for the mantissa. It does not support any exceptions. 2155 It is very simple, and approximately 3-6 times faster than NWFPE. 2156 2157 It should be sufficient for most programs. It may be not suitable 2158 for scientific calculations, but you have to check this for yourself. 2159 If you do not feel you need a faster FP emulation you should better 2160 choose NWFPE. 2161 2162config VFP 2163 bool "VFP-format floating point maths" 2164 depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON 2165 help 2166 Say Y to include VFP support code in the kernel. This is needed 2167 if your hardware includes a VFP unit. 2168 2169 Please see <file:Documentation/arm/VFP/release-notes.txt> for 2170 release notes and additional status information. 2171 2172 Say N if your target does not have VFP hardware. 2173 2174config VFPv3 2175 bool 2176 depends on VFP 2177 default y if CPU_V7 2178 2179config NEON 2180 bool "Advanced SIMD (NEON) Extension support" 2181 depends on VFPv3 && CPU_V7 2182 help 2183 Say Y to include support code for NEON, the ARMv7 Advanced SIMD 2184 Extension. 2185 2186endmenu 2187 2188menu "Userspace binary formats" 2189 2190source "fs/Kconfig.binfmt" 2191 2192config ARTHUR 2193 tristate "RISC OS personality" 2194 depends on !AEABI 2195 help 2196 Say Y here to include the kernel code necessary if you want to run 2197 Acorn RISC OS/Arthur binaries under Linux. This code is still very 2198 experimental; if this sounds frightening, say N and sleep in peace. 2199 You can also say M here to compile this support as a module (which 2200 will be called arthur). 2201 2202endmenu 2203 2204menu "Power management options" 2205 2206source "kernel/power/Kconfig" 2207 2208config ARCH_SUSPEND_POSSIBLE 2209 depends on !ARCH_S5PC100 2210 depends on CPU_ARM920T || CPU_ARM926T || CPU_SA1100 || \ 2211 CPU_V6 || CPU_V6K || CPU_V7 || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK 2212 def_bool y 2213 2214config ARM_CPU_SUSPEND 2215 def_bool PM_SLEEP 2216 2217endmenu 2218 2219source "net/Kconfig" 2220 2221source "drivers/Kconfig" 2222 2223source "fs/Kconfig" 2224 2225source "arch/arm/Kconfig.debug" 2226 2227source "security/Kconfig" 2228 2229source "crypto/Kconfig" 2230 2231source "lib/Kconfig" 2232 2233source "arch/arm/kvm/Kconfig" 2234