tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
1
fork

Configure Feed

Select the types of activity you want to include in your feed.

kernel / arch / arm / mm / Kconfig
at v2.6.30-rc7 762 lines 19 kB view raw
1comment "Processor Type" 2 3config CPU_32 4 bool 5 default y 6 7# Select CPU types depending on the architecture selected. This selects 8# which CPUs we support in the kernel image, and the compiler instruction 9# optimiser behaviour. 10 11# ARM610 12config CPU_ARM610 13 bool "Support ARM610 processor" if ARCH_RPC 14 select CPU_32v3 15 select CPU_CACHE_V3 16 select CPU_CACHE_VIVT 17 select CPU_CP15_MMU 18 select CPU_COPY_V3 if MMU 19 select CPU_TLB_V3 if MMU 20 select CPU_PABRT_NOIFAR 21 help 22 The ARM610 is the successor to the ARM3 processor 23 and was produced by VLSI Technology Inc. 24 25 Say Y if you want support for the ARM610 processor. 26 Otherwise, say N. 27 28# ARM7TDMI 29config CPU_ARM7TDMI 30 bool "Support ARM7TDMI processor" 31 depends on !MMU 32 select CPU_32v4T 33 select CPU_ABRT_LV4T 34 select CPU_PABRT_NOIFAR 35 select CPU_CACHE_V4 36 help 37 A 32-bit RISC microprocessor based on the ARM7 processor core 38 which has no memory control unit and cache. 39 40 Say Y if you want support for the ARM7TDMI processor. 41 Otherwise, say N. 42 43# ARM710 44config CPU_ARM710 45 bool "Support ARM710 processor" if ARCH_RPC 46 select CPU_32v3 47 select CPU_CACHE_V3 48 select CPU_CACHE_VIVT 49 select CPU_CP15_MMU 50 select CPU_COPY_V3 if MMU 51 select CPU_TLB_V3 if MMU 52 select CPU_PABRT_NOIFAR 53 help 54 A 32-bit RISC microprocessor based on the ARM7 processor core 55 designed by Advanced RISC Machines Ltd. The ARM710 is the 56 successor to the ARM610 processor. It was released in 57 July 1994 by VLSI Technology Inc. 58 59 Say Y if you want support for the ARM710 processor. 60 Otherwise, say N. 61 62# ARM720T 63config CPU_ARM720T 64 bool "Support ARM720T processor" if ARCH_INTEGRATOR 65 select CPU_32v4T 66 select CPU_ABRT_LV4T 67 select CPU_PABRT_NOIFAR 68 select CPU_CACHE_V4 69 select CPU_CACHE_VIVT 70 select CPU_CP15_MMU 71 select CPU_COPY_V4WT if MMU 72 select CPU_TLB_V4WT if MMU 73 help 74 A 32-bit RISC processor with 8kByte Cache, Write Buffer and 75 MMU built around an ARM7TDMI core. 76 77 Say Y if you want support for the ARM720T processor. 78 Otherwise, say N. 79 80# ARM740T 81config CPU_ARM740T 82 bool "Support ARM740T processor" if ARCH_INTEGRATOR 83 depends on !MMU 84 select CPU_32v4T 85 select CPU_ABRT_LV4T 86 select CPU_PABRT_NOIFAR 87 select CPU_CACHE_V3 # although the core is v4t 88 select CPU_CP15_MPU 89 help 90 A 32-bit RISC processor with 8KB cache or 4KB variants, 91 write buffer and MPU(Protection Unit) built around 92 an ARM7TDMI core. 93 94 Say Y if you want support for the ARM740T processor. 95 Otherwise, say N. 96 97# ARM9TDMI 98config CPU_ARM9TDMI 99 bool "Support ARM9TDMI processor" 100 depends on !MMU 101 select CPU_32v4T 102 select CPU_ABRT_NOMMU 103 select CPU_PABRT_NOIFAR 104 select CPU_CACHE_V4 105 help 106 A 32-bit RISC microprocessor based on the ARM9 processor core 107 which has no memory control unit and cache. 108 109 Say Y if you want support for the ARM9TDMI processor. 110 Otherwise, say N. 111 112# ARM920T 113config CPU_ARM920T 114 bool "Support ARM920T processor" if ARCH_INTEGRATOR 115 select CPU_32v4T 116 select CPU_ABRT_EV4T 117 select CPU_PABRT_NOIFAR 118 select CPU_CACHE_V4WT 119 select CPU_CACHE_VIVT 120 select CPU_CP15_MMU 121 select CPU_COPY_V4WB if MMU 122 select CPU_TLB_V4WBI if MMU 123 help 124 The ARM920T is licensed to be produced by numerous vendors, 125 and is used in the Maverick EP9312 and the Samsung S3C2410. 126 127 More information on the Maverick EP9312 at 128 <http://linuxdevices.com/products/PD2382866068.html>. 129 130 Say Y if you want support for the ARM920T processor. 131 Otherwise, say N. 132 133# ARM922T 134config CPU_ARM922T 135 bool "Support ARM922T processor" if ARCH_INTEGRATOR 136 select CPU_32v4T 137 select CPU_ABRT_EV4T 138 select CPU_PABRT_NOIFAR 139 select CPU_CACHE_V4WT 140 select CPU_CACHE_VIVT 141 select CPU_CP15_MMU 142 select CPU_COPY_V4WB if MMU 143 select CPU_TLB_V4WBI if MMU 144 help 145 The ARM922T is a version of the ARM920T, but with smaller 146 instruction and data caches. It is used in Altera's 147 Excalibur XA device family and Micrel's KS8695 Centaur. 148 149 Say Y if you want support for the ARM922T processor. 150 Otherwise, say N. 151 152# ARM925T 153config CPU_ARM925T 154 bool "Support ARM925T processor" if ARCH_OMAP1 155 select CPU_32v4T 156 select CPU_ABRT_EV4T 157 select CPU_PABRT_NOIFAR 158 select CPU_CACHE_V4WT 159 select CPU_CACHE_VIVT 160 select CPU_CP15_MMU 161 select CPU_COPY_V4WB if MMU 162 select CPU_TLB_V4WBI if MMU 163 help 164 The ARM925T is a mix between the ARM920T and ARM926T, but with 165 different instruction and data caches. It is used in TI's OMAP 166 device family. 167 168 Say Y if you want support for the ARM925T processor. 169 Otherwise, say N. 170 171# ARM926T 172config CPU_ARM926T 173 bool "Support ARM926T processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB 174 select CPU_32v5 175 select CPU_ABRT_EV5TJ 176 select CPU_PABRT_NOIFAR 177 select CPU_CACHE_VIVT 178 select CPU_CP15_MMU 179 select CPU_COPY_V4WB if MMU 180 select CPU_TLB_V4WBI if MMU 181 help 182 This is a variant of the ARM920. It has slightly different 183 instruction sequences for cache and TLB operations. Curiously, 184 there is no documentation on it at the ARM corporate website. 185 186 Say Y if you want support for the ARM926T processor. 187 Otherwise, say N. 188 189# FA526 190config CPU_FA526 191 bool 192 select CPU_32v4 193 select CPU_ABRT_EV4 194 select CPU_PABRT_NOIFAR 195 select CPU_CACHE_VIVT 196 select CPU_CP15_MMU 197 select CPU_CACHE_FA 198 select CPU_COPY_FA if MMU 199 select CPU_TLB_FA if MMU 200 help 201 The FA526 is a version of the ARMv4 compatible processor with 202 Branch Target Buffer, Unified TLB and cache line size 16. 203 204 Say Y if you want support for the FA526 processor. 205 Otherwise, say N. 206 207# ARM940T 208config CPU_ARM940T 209 bool "Support ARM940T processor" if ARCH_INTEGRATOR 210 depends on !MMU 211 select CPU_32v4T 212 select CPU_ABRT_NOMMU 213 select CPU_PABRT_NOIFAR 214 select CPU_CACHE_VIVT 215 select CPU_CP15_MPU 216 help 217 ARM940T is a member of the ARM9TDMI family of general- 218 purpose microprocessors with MPU and separate 4KB 219 instruction and 4KB data cases, each with a 4-word line 220 length. 221 222 Say Y if you want support for the ARM940T processor. 223 Otherwise, say N. 224 225# ARM946E-S 226config CPU_ARM946E 227 bool "Support ARM946E-S processor" if ARCH_INTEGRATOR 228 depends on !MMU 229 select CPU_32v5 230 select CPU_ABRT_NOMMU 231 select CPU_PABRT_NOIFAR 232 select CPU_CACHE_VIVT 233 select CPU_CP15_MPU 234 help 235 ARM946E-S is a member of the ARM9E-S family of high- 236 performance, 32-bit system-on-chip processor solutions. 237 The TCM and ARMv5TE 32-bit instruction set is supported. 238 239 Say Y if you want support for the ARM946E-S processor. 240 Otherwise, say N. 241 242# ARM1020 - needs validating 243config CPU_ARM1020 244 bool "Support ARM1020T (rev 0) processor" if ARCH_INTEGRATOR 245 select CPU_32v5 246 select CPU_ABRT_EV4T 247 select CPU_PABRT_NOIFAR 248 select CPU_CACHE_V4WT 249 select CPU_CACHE_VIVT 250 select CPU_CP15_MMU 251 select CPU_COPY_V4WB if MMU 252 select CPU_TLB_V4WBI if MMU 253 help 254 The ARM1020 is the 32K cached version of the ARM10 processor, 255 with an addition of a floating-point unit. 256 257 Say Y if you want support for the ARM1020 processor. 258 Otherwise, say N. 259 260# ARM1020E - needs validating 261config CPU_ARM1020E 262 bool "Support ARM1020E processor" if ARCH_INTEGRATOR 263 select CPU_32v5 264 select CPU_ABRT_EV4T 265 select CPU_PABRT_NOIFAR 266 select CPU_CACHE_V4WT 267 select CPU_CACHE_VIVT 268 select CPU_CP15_MMU 269 select CPU_COPY_V4WB if MMU 270 select CPU_TLB_V4WBI if MMU 271 depends on n 272 273# ARM1022E 274config CPU_ARM1022 275 bool "Support ARM1022E processor" if ARCH_INTEGRATOR 276 select CPU_32v5 277 select CPU_ABRT_EV4T 278 select CPU_PABRT_NOIFAR 279 select CPU_CACHE_VIVT 280 select CPU_CP15_MMU 281 select CPU_COPY_V4WB if MMU # can probably do better 282 select CPU_TLB_V4WBI if MMU 283 help 284 The ARM1022E is an implementation of the ARMv5TE architecture 285 based upon the ARM10 integer core with a 16KiB L1 Harvard cache, 286 embedded trace macrocell, and a floating-point unit. 287 288 Say Y if you want support for the ARM1022E processor. 289 Otherwise, say N. 290 291# ARM1026EJ-S 292config CPU_ARM1026 293 bool "Support ARM1026EJ-S processor" if ARCH_INTEGRATOR 294 select CPU_32v5 295 select CPU_ABRT_EV5T # But need Jazelle, but EV5TJ ignores bit 10 296 select CPU_PABRT_NOIFAR 297 select CPU_CACHE_VIVT 298 select CPU_CP15_MMU 299 select CPU_COPY_V4WB if MMU # can probably do better 300 select CPU_TLB_V4WBI if MMU 301 help 302 The ARM1026EJ-S is an implementation of the ARMv5TEJ architecture 303 based upon the ARM10 integer core. 304 305 Say Y if you want support for the ARM1026EJ-S processor. 306 Otherwise, say N. 307 308# SA110 309config CPU_SA110 310 bool "Support StrongARM(R) SA-110 processor" if ARCH_RPC 311 select CPU_32v3 if ARCH_RPC 312 select CPU_32v4 if !ARCH_RPC 313 select CPU_ABRT_EV4 314 select CPU_PABRT_NOIFAR 315 select CPU_CACHE_V4WB 316 select CPU_CACHE_VIVT 317 select CPU_CP15_MMU 318 select CPU_COPY_V4WB if MMU 319 select CPU_TLB_V4WB if MMU 320 help 321 The Intel StrongARM(R) SA-110 is a 32-bit microprocessor and 322 is available at five speeds ranging from 100 MHz to 233 MHz. 323 More information is available at 324 <http://developer.intel.com/design/strong/sa110.htm>. 325 326 Say Y if you want support for the SA-110 processor. 327 Otherwise, say N. 328 329# SA1100 330config CPU_SA1100 331 bool 332 select CPU_32v4 333 select CPU_ABRT_EV4 334 select CPU_PABRT_NOIFAR 335 select CPU_CACHE_V4WB 336 select CPU_CACHE_VIVT 337 select CPU_CP15_MMU 338 select CPU_TLB_V4WB if MMU 339 340# XScale 341config CPU_XSCALE 342 bool 343 select CPU_32v5 344 select CPU_ABRT_EV5T 345 select CPU_PABRT_NOIFAR 346 select CPU_CACHE_VIVT 347 select CPU_CP15_MMU 348 select CPU_TLB_V4WBI if MMU 349 350# XScale Core Version 3 351config CPU_XSC3 352 bool 353 select CPU_32v5 354 select CPU_ABRT_EV5T 355 select CPU_PABRT_NOIFAR 356 select CPU_CACHE_VIVT 357 select CPU_CP15_MMU 358 select CPU_TLB_V4WBI if MMU 359 select IO_36 360 361# Marvell PJ1 (Mohawk) 362config CPU_MOHAWK 363 bool 364 select CPU_32v5 365 select CPU_ABRT_EV5T 366 select CPU_PABRT_NOIFAR 367 select CPU_CACHE_VIVT 368 select CPU_CP15_MMU 369 select CPU_TLB_V4WBI if MMU 370 select CPU_COPY_V4WB if MMU 371 372# Feroceon 373config CPU_FEROCEON 374 bool 375 select CPU_32v5 376 select CPU_ABRT_EV5T 377 select CPU_PABRT_NOIFAR 378 select CPU_CACHE_VIVT 379 select CPU_CP15_MMU 380 select CPU_COPY_FEROCEON if MMU 381 select CPU_TLB_FEROCEON if MMU 382 383config CPU_FEROCEON_OLD_ID 384 bool "Accept early Feroceon cores with an ARM926 ID" 385 depends on CPU_FEROCEON && !CPU_ARM926T 386 default y 387 help 388 This enables the usage of some old Feroceon cores 389 for which the CPU ID is equal to the ARM926 ID. 390 Relevant for Feroceon-1850 and early Feroceon-2850. 391 392# ARMv6 393config CPU_V6 394 bool "Support ARM V6 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB 395 select CPU_32v6 396 select CPU_ABRT_EV6 397 select CPU_PABRT_NOIFAR 398 select CPU_CACHE_V6 399 select CPU_CACHE_VIPT 400 select CPU_CP15_MMU 401 select CPU_HAS_ASID if MMU 402 select CPU_COPY_V6 if MMU 403 select CPU_TLB_V6 if MMU 404 405# ARMv6k 406config CPU_32v6K 407 bool "Support ARM V6K processor extensions" if !SMP 408 depends on CPU_V6 409 default y if SMP && !ARCH_MX3 410 help 411 Say Y here if your ARMv6 processor supports the 'K' extension. 412 This enables the kernel to use some instructions not present 413 on previous processors, and as such a kernel build with this 414 enabled will not boot on processors with do not support these 415 instructions. 416 417# ARMv7 418config CPU_V7 419 bool "Support ARM V7 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB 420 select CPU_32v6K 421 select CPU_32v7 422 select CPU_ABRT_EV7 423 select CPU_PABRT_IFAR 424 select CPU_CACHE_V7 425 select CPU_CACHE_VIPT 426 select CPU_CP15_MMU 427 select CPU_HAS_ASID if MMU 428 select CPU_COPY_V6 if MMU 429 select CPU_TLB_V7 if MMU 430 431# Figure out what processor architecture version we should be using. 432# This defines the compiler instruction set which depends on the machine type. 433config CPU_32v3 434 bool 435 select TLS_REG_EMUL if SMP || !MMU 436 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP 437 438config CPU_32v4 439 bool 440 select TLS_REG_EMUL if SMP || !MMU 441 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP 442 443config CPU_32v4T 444 bool 445 select TLS_REG_EMUL if SMP || !MMU 446 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP 447 448config CPU_32v5 449 bool 450 select TLS_REG_EMUL if SMP || !MMU 451 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP 452 453config CPU_32v6 454 bool 455 select TLS_REG_EMUL if !CPU_32v6K && !MMU 456 457config CPU_32v7 458 bool 459 460# The abort model 461config CPU_ABRT_NOMMU 462 bool 463 464config CPU_ABRT_EV4 465 bool 466 467config CPU_ABRT_EV4T 468 bool 469 470config CPU_ABRT_LV4T 471 bool 472 473config CPU_ABRT_EV5T 474 bool 475 476config CPU_ABRT_EV5TJ 477 bool 478 479config CPU_ABRT_EV6 480 bool 481 482config CPU_ABRT_EV7 483 bool 484 485config CPU_PABRT_IFAR 486 bool 487 488config CPU_PABRT_NOIFAR 489 bool 490 491# The cache model 492config CPU_CACHE_V3 493 bool 494 495config CPU_CACHE_V4 496 bool 497 498config CPU_CACHE_V4WT 499 bool 500 501config CPU_CACHE_V4WB 502 bool 503 504config CPU_CACHE_V6 505 bool 506 507config CPU_CACHE_V7 508 bool 509 510config CPU_CACHE_VIVT 511 bool 512 513config CPU_CACHE_VIPT 514 bool 515 516config CPU_CACHE_FA 517 bool 518 519if MMU 520# The copy-page model 521config CPU_COPY_V3 522 bool 523 524config CPU_COPY_V4WT 525 bool 526 527config CPU_COPY_V4WB 528 bool 529 530config CPU_COPY_FEROCEON 531 bool 532 533config CPU_COPY_FA 534 bool 535 536config CPU_COPY_V6 537 bool 538 539# This selects the TLB model 540config CPU_TLB_V3 541 bool 542 help 543 ARM Architecture Version 3 TLB. 544 545config CPU_TLB_V4WT 546 bool 547 help 548 ARM Architecture Version 4 TLB with writethrough cache. 549 550config CPU_TLB_V4WB 551 bool 552 help 553 ARM Architecture Version 4 TLB with writeback cache. 554 555config CPU_TLB_V4WBI 556 bool 557 help 558 ARM Architecture Version 4 TLB with writeback cache and invalidate 559 instruction cache entry. 560 561config CPU_TLB_FEROCEON 562 bool 563 help 564 Feroceon TLB (v4wbi with non-outer-cachable page table walks). 565 566config CPU_TLB_FA 567 bool 568 help 569 Faraday ARM FA526 architecture, unified TLB with writeback cache 570 and invalidate instruction cache entry. Branch target buffer is 571 also supported. 572 573config CPU_TLB_V6 574 bool 575 576config CPU_TLB_V7 577 bool 578 579endif 580 581config CPU_HAS_ASID 582 bool 583 help 584 This indicates whether the CPU has the ASID register; used to 585 tag TLB and possibly cache entries. 586 587config CPU_CP15 588 bool 589 help 590 Processor has the CP15 register. 591 592config CPU_CP15_MMU 593 bool 594 select CPU_CP15 595 help 596 Processor has the CP15 register, which has MMU related registers. 597 598config CPU_CP15_MPU 599 bool 600 select CPU_CP15 601 help 602 Processor has the CP15 register, which has MPU related registers. 603 604# 605# CPU supports 36-bit I/O 606# 607config IO_36 608 bool 609 610comment "Processor Features" 611 612config ARM_THUMB 613 bool "Support Thumb user binaries" 614 depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_V6 || CPU_V7 || CPU_FEROCEON 615 default y 616 help 617 Say Y if you want to include kernel support for running user space 618 Thumb binaries. 619 620 The Thumb instruction set is a compressed form of the standard ARM 621 instruction set resulting in smaller binaries at the expense of 622 slightly less efficient code. 623 624 If you don't know what this all is, saying Y is a safe choice. 625 626config ARM_THUMBEE 627 bool "Enable ThumbEE CPU extension" 628 depends on CPU_V7 629 help 630 Say Y here if you have a CPU with the ThumbEE extension and code to 631 make use of it. Say N for code that can run on CPUs without ThumbEE. 632 633config CPU_BIG_ENDIAN 634 bool "Build big-endian kernel" 635 depends on ARCH_SUPPORTS_BIG_ENDIAN 636 help 637 Say Y if you plan on running a kernel in big-endian mode. 638 Note that your board must be properly built and your board 639 port must properly enable any big-endian related features 640 of your chipset/board/processor. 641 642config CPU_HIGH_VECTOR 643 depends on !MMU && CPU_CP15 && !CPU_ARM740T 644 bool "Select the High exception vector" 645 default n 646 help 647 Say Y here to select high exception vector(0xFFFF0000~). 648 The exception vector can be vary depending on the platform 649 design in nommu mode. If your platform needs to select 650 high exception vector, say Y. 651 Otherwise or if you are unsure, say N, and the low exception 652 vector (0x00000000~) will be used. 653 654config CPU_ICACHE_DISABLE 655 bool "Disable I-Cache (I-bit)" 656 depends on CPU_CP15 && !(CPU_ARM610 || CPU_ARM710 || CPU_ARM720T || CPU_ARM740T || CPU_XSCALE || CPU_XSC3) 657 help 658 Say Y here to disable the processor instruction cache. Unless 659 you have a reason not to or are unsure, say N. 660 661config CPU_DCACHE_DISABLE 662 bool "Disable D-Cache (C-bit)" 663 depends on CPU_CP15 664 help 665 Say Y here to disable the processor data cache. Unless 666 you have a reason not to or are unsure, say N. 667 668config CPU_DCACHE_SIZE 669 hex 670 depends on CPU_ARM740T || CPU_ARM946E 671 default 0x00001000 if CPU_ARM740T 672 default 0x00002000 # default size for ARM946E-S 673 help 674 Some cores are synthesizable to have various sized cache. For 675 ARM946E-S case, it can vary from 0KB to 1MB. 676 To support such cache operations, it is efficient to know the size 677 before compile time. 678 If your SoC is configured to have a different size, define the value 679 here with proper conditions. 680 681config CPU_DCACHE_WRITETHROUGH 682 bool "Force write through D-cache" 683 depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || CPU_ARM946E || CPU_ARM1020 || CPU_FA526) && !CPU_DCACHE_DISABLE 684 default y if CPU_ARM925T 685 help 686 Say Y here to use the data cache in writethrough mode. Unless you 687 specifically require this or are unsure, say N. 688 689config CPU_CACHE_ROUND_ROBIN 690 bool "Round robin I and D cache replacement algorithm" 691 depends on (CPU_ARM926T || CPU_ARM946E || CPU_ARM1020) && (!CPU_ICACHE_DISABLE || !CPU_DCACHE_DISABLE) 692 help 693 Say Y here to use the predictable round-robin cache replacement 694 policy. Unless you specifically require this or are unsure, say N. 695 696config CPU_BPREDICT_DISABLE 697 bool "Disable branch prediction" 698 depends on CPU_ARM1020 || CPU_V6 || CPU_MOHAWK || CPU_XSC3 || CPU_V7 || CPU_FA526 699 help 700 Say Y here to disable branch prediction. If unsure, say N. 701 702config TLS_REG_EMUL 703 bool 704 help 705 An SMP system using a pre-ARMv6 processor (there are apparently 706 a few prototypes like that in existence) and therefore access to 707 that required register must be emulated. 708 709config HAS_TLS_REG 710 bool 711 depends on !TLS_REG_EMUL 712 default y if SMP || CPU_32v7 713 help 714 This selects support for the CP15 thread register. 715 It is defined to be available on some ARMv6 processors (including 716 all SMP capable ARMv6's) or later processors. User space may 717 assume directly accessing that register and always obtain the 718 expected value only on ARMv7 and above. 719 720config NEEDS_SYSCALL_FOR_CMPXCHG 721 bool 722 help 723 SMP on a pre-ARMv6 processor? Well OK then. 724 Forget about fast user space cmpxchg support. 725 It is just not possible. 726 727config OUTER_CACHE 728 bool 729 default n 730 731config CACHE_FEROCEON_L2 732 bool "Enable the Feroceon L2 cache controller" 733 depends on ARCH_KIRKWOOD || ARCH_MV78XX0 734 default y 735 select OUTER_CACHE 736 help 737 This option enables the Feroceon L2 cache controller. 738 739config CACHE_FEROCEON_L2_WRITETHROUGH 740 bool "Force Feroceon L2 cache write through" 741 depends on CACHE_FEROCEON_L2 742 default n 743 help 744 Say Y here to use the Feroceon L2 cache in writethrough mode. 745 Unless you specifically require this, say N for writeback mode. 746 747config CACHE_L2X0 748 bool "Enable the L2x0 outer cache controller" 749 depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176 || \ 750 REALVIEW_EB_A9MP || ARCH_MX35 || ARCH_MX31 751 default y 752 select OUTER_CACHE 753 help 754 This option enables the L2x0 PrimeCell. 755 756config CACHE_XSC3L2 757 bool "Enable the L2 cache on XScale3" 758 depends on CPU_XSC3 759 default y 760 select OUTER_CACHE 761 help 762 This option enables the L2 cache on XScale3.