1# SPDX-License-Identifier: GPL-2.0 2config ALPHA 3 bool 4 default y 5 select ARCH_32BIT_USTAT_F_TINODE 6 select ARCH_HAS_CURRENT_STACK_POINTER 7 select ARCH_MIGHT_HAVE_PC_PARPORT 8 select ARCH_MIGHT_HAVE_PC_SERIO 9 select ARCH_NO_PREEMPT 10 select ARCH_NO_SG_CHAIN 11 select ARCH_USE_CMPXCHG_LOCKREF 12 select DMA_OPS if PCI 13 select FORCE_PCI if !ALPHA_JENSEN 14 select PCI_DOMAINS if PCI 15 select PCI_SYSCALL if PCI 16 select HAVE_ASM_MODVERSIONS 17 select HAVE_PAGE_SIZE_8KB 18 select HAVE_PCSPKR_PLATFORM 19 select HAVE_PERF_EVENTS 20 select NEED_DMA_MAP_STATE 21 select NEED_SG_DMA_LENGTH 22 select GENERIC_IRQ_PROBE 23 select GENERIC_PCI_IOMAP 24 select AUTO_IRQ_AFFINITY if SMP 25 select GENERIC_IRQ_SHOW 26 select ARCH_WANT_IPC_PARSE_VERSION 27 select ARCH_HAVE_NMI_SAFE_CMPXCHG 28 select AUDIT_ARCH 29 select GENERIC_CPU_VULNERABILITIES 30 select GENERIC_SMP_IDLE_THREAD 31 select HAS_IOPORT 32 select HAVE_ARCH_AUDITSYSCALL 33 select HAVE_MOD_ARCH_SPECIFIC 34 select LOCK_MM_AND_FIND_VMA 35 select MODULES_USE_ELF_RELA 36 select ODD_RT_SIGACTION 37 select OLD_SIGSUSPEND 38 select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67 39 select MMU_GATHER_NO_RANGE 40 select SPARSEMEM_EXTREME if SPARSEMEM 41 select ZONE_DMA 42 help 43 The Alpha is a 64-bit general-purpose processor designed and 44 marketed by the Digital Equipment Corporation of blessed memory, 45 now Hewlett-Packard. The Alpha Linux project has a home page at 46 <http://www.alphalinux.org/>. 47 48config 64BIT 49 def_bool y 50 51config MMU 52 bool 53 default y 54 55config ARCH_HAS_ILOG2_U32 56 bool 57 default n 58 59config ARCH_HAS_ILOG2_U64 60 bool 61 default n 62 63config GENERIC_CALIBRATE_DELAY 64 bool 65 default y 66 67config GENERIC_ISA_DMA 68 bool 69 default y 70 71config PGTABLE_LEVELS 72 int 73 default 3 74 75config AUDIT_ARCH 76 bool 77 78menu "System setup" 79 80choice 81 prompt "Alpha system type" 82 default ALPHA_GENERIC 83 help 84 This is the system type of your hardware. A "generic" kernel will 85 run on any supported Alpha system. However, if you configure a 86 kernel for your specific system, it will be faster and smaller. 87 88 To find out what type of Alpha system you have, you may want to 89 check out the Linux/Alpha FAQ, accessible on the WWW from 90 <http://www.alphalinux.org/>. In summary: 91 92 Alcor/Alpha-XLT AS 600, AS 500, XL-300, XL-366 93 Alpha-XL XL-233, XL-266 94 AlphaBook1 Alpha laptop 95 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, AS 400 96 Cabriolet AlphaPC64, AlphaPCI64 97 DP264 DP264 / DS20 / ES40 / DS10 / DS10L 98 EB164 EB164 21164 evaluation board 99 EB64+ EB64+ 21064 evaluation board 100 EB66 EB66 21066 evaluation board 101 EB66+ EB66+ 21066 evaluation board 102 Jensen DECpc 150, DEC 2000 models 300, 500 103 LX164 AlphaPC164-LX 104 Lynx AS 2100A 105 Miata Personal Workstation 433/500/600 a/au 106 Marvel AlphaServer ES47 / ES80 / GS1280 107 Mikasa AS 1000 108 Noname AXPpci33, UDB (Multia) 109 Noritake AS 1000A, AS 600A, AS 800 110 PC164 AlphaPC164 111 Rawhide AS 1200, AS 4000, AS 4100 112 Ruffian RPX164-2, AlphaPC164-UX, AlphaPC164-BX 113 SX164 AlphaPC164-SX 114 Sable AS 2000, AS 2100 115 Shark DS 20L 116 Takara Takara (OEM) 117 Titan AlphaServer ES45 / DS25 / DS15 118 Wildfire AlphaServer GS 40/80/160/320 119 120 If you don't know what to do, choose "generic". 121 122config ALPHA_GENERIC 123 bool "Generic" 124 depends on TTY 125 select HAVE_EISA 126 help 127 A generic kernel will run on all supported Alpha hardware. 128 129config ALPHA_ALCOR 130 bool "Alcor/Alpha-XLT" 131 select HAVE_EISA 132 help 133 For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data 134 slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O 135 Address, CIA) - a 383 pin plastic PGA). It provides a DRAM 136 controller (256-bit memory bus) and a PCI interface. It also does 137 all the work required to support an external Bcache and to maintain 138 memory coherence when a PCI device DMAs into (or out of) memory. 139 140config ALPHA_XL 141 bool "Alpha-XL" 142 help 143 XL-233 and XL-266-based Alpha systems. 144 145config ALPHA_BOOK1 146 bool "AlphaBook1" 147 help 148 Dec AlphaBook1/Burns Alpha-based laptops. 149 150config ALPHA_AVANTI_CH 151 bool "Avanti" 152 153config ALPHA_CABRIOLET 154 bool "Cabriolet" 155 help 156 Cabriolet AlphaPC64, AlphaPCI64 systems. Derived from EB64+ but now 157 baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA 158 slots, 4 PCI slots (one pair are on a shared slot), uses plug-in 159 Bcache SIMMs. Requires power supply with 3.3V output. 160 161config ALPHA_DP264 162 bool "DP264" 163 help 164 Various 21264 systems with the tsunami core logic chipset. 165 API Networks: 264DP, UP2000(+), CS20; 166 Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40. 167 168config ALPHA_EB164 169 bool "EB164" 170 help 171 EB164 21164 evaluation board from DEC. Uses 21164 and ALCOR. Has 172 ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is 173 shared with an ISA slot) and 2 32-bit PCI slots. Uses plus-in 174 Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD, 175 MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized 176 motherboard. Requires power supply with 3.3V output. 177 178config ALPHA_EB64P_CH 179 bool "EB64+" 180 181config ALPHA_EB66 182 bool "EB66" 183 help 184 A Digital DS group board. Uses 21066 or 21066A. I/O sub-system is 185 identical to EB64+. Baby PC-AT size. Runs from standard PC power 186 supply. The EB66 schematic was published as a marketing poster 187 advertising the 21066 as "the first microprocessor in the world with 188 embedded PCI". 189 190config ALPHA_EB66P 191 bool "EB66+" 192 help 193 Later variant of the EB66 board. 194 195config ALPHA_EIGER 196 bool "Eiger" 197 help 198 Apparently an obscure OEM single-board computer based on the 199 Typhoon/Tsunami chipset family. Information on it is scanty. 200 201config ALPHA_JENSEN 202 bool "Jensen" 203 select HAVE_EISA 204 help 205 DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one 206 of the first-generation Alpha systems. A number of these systems 207 seem to be available on the second- hand market. The Jensen is a 208 floor-standing tower system which originally used a 150MHz 21064 It 209 used programmable logic to interface a 486 EISA I/O bridge to the 210 CPU. 211 212config ALPHA_LX164 213 bool "LX164" 214 help 215 A technical overview of this board is available at 216 <http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>. 217 218config ALPHA_LYNX 219 bool "Lynx" 220 select HAVE_EISA 221 help 222 AlphaServer 2100A-based systems. 223 224config ALPHA_MARVEL 225 bool "Marvel" 226 help 227 AlphaServer ES47 / ES80 / GS1280 based on EV7. 228 229config ALPHA_MIATA 230 bool "Miata" 231 select HAVE_EISA 232 help 233 The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a, 234 or 600au). 235 236config ALPHA_MIKASA 237 bool "Mikasa" 238 help 239 AlphaServer 1000-based Alpha systems. 240 241config ALPHA_NAUTILUS 242 bool "Nautilus" 243 help 244 Alpha systems based on the AMD 751 & ALI 1543C chipsets. 245 246config ALPHA_NONAME_CH 247 bool "Noname" 248 249config ALPHA_NORITAKE 250 bool "Noritake" 251 select HAVE_EISA 252 help 253 AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based 254 systems. 255 256config ALPHA_PC164 257 bool "PC164" 258 259config ALPHA_P2K 260 bool "Platform2000" 261 262config ALPHA_RAWHIDE 263 bool "Rawhide" 264 select HAVE_EISA 265 help 266 AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines. 267 See HOWTO at 268 <http://www.alphalinux.org/docs/rawhide/4100_install.shtml>. 269 270config ALPHA_RUFFIAN 271 bool "Ruffian" 272 help 273 Samsung APC164UX. There is a page on known problems and workarounds 274 at <http://www.alphalinux.org/faq/FAQ-11.html>. 275 276config ALPHA_RX164 277 bool "RX164" 278 279config ALPHA_SX164 280 bool "SX164" 281 282config ALPHA_SABLE 283 bool "Sable" 284 select HAVE_EISA 285 help 286 Digital AlphaServer 2000 and 2100-based systems. 287 288config ALPHA_SHARK 289 bool "Shark" 290 291config ALPHA_TAKARA 292 bool "Takara" 293 help 294 Alpha 11164-based OEM single-board computer. 295 296config ALPHA_TITAN 297 bool "Titan" 298 help 299 AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset. 300 301config ALPHA_WILDFIRE 302 bool "Wildfire" 303 help 304 AlphaServer GS 40/80/160/320 SMP based on the EV67 core. 305 306endchoice 307 308# clear all implied options (don't want default values for those): 309# Most of these machines have ISA slots; not exactly sure which don't, 310# and this doesn't activate hordes of code, so do it always. 311config ISA 312 bool 313 default y 314 help 315 Find out whether you have ISA slots on your motherboard. ISA is the 316 name of a bus system, i.e. the way the CPU talks to the other stuff 317 inside your box. Other bus systems are PCI, EISA, MicroChannel 318 (MCA) or VESA. ISA is an older system, now being displaced by PCI; 319 newer boards don't support it. If you have ISA, say Y, otherwise N. 320 321config ISA_DMA_API 322 bool 323 default y 324 325config ALPHA_NONAME 326 bool 327 depends on ALPHA_BOOK1 || ALPHA_NONAME_CH 328 default y 329 help 330 The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia 331 UDB). This design was produced by Digital's Technical OEM (TOEM) 332 group. It uses the 21066 processor running at 166MHz or 233MHz. It 333 is a baby-AT size, and runs from a standard PC power supply. It has 334 5 ISA slots and 3 PCI slots (one pair are a shared slot). There are 335 2 versions, with either PS/2 or large DIN connectors for the 336 keyboard. 337 338config ALPHA_EV4 339 bool 340 depends on ALPHA_JENSEN || (ALPHA_SABLE && !ALPHA_GAMMA) || ALPHA_LYNX || ALPHA_NORITAKE && !ALPHA_PRIMO || ALPHA_MIKASA && !ALPHA_PRIMO || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL || ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K 341 default y if !ALPHA_LYNX 342 default y if !ALPHA_EV5 343 344config ALPHA_LCA 345 bool 346 depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K 347 default y 348 349config ALPHA_APECS 350 bool 351 depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL 352 default y 353 354config ALPHA_EB64P 355 bool 356 depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH 357 default y 358 help 359 Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3 ISA, 360 2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs. 361 ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI 362 (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style), 363 SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM. PC-AT size. 364 Runs from standard PC power supply. 365 366config ALPHA_EV5 367 bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX 368 default y if ALPHA_RX164 || ALPHA_RAWHIDE || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_SABLE && ALPHA_GAMMA || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR 369 370config ALPHA_CIA 371 bool 372 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR 373 default y 374 375config ALPHA_EV56 376 bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR 377 default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA 378 379config ALPHA_EV56 380 prompt "EV56 CPU (speed >= 333MHz)?" 381 depends on ALPHA_NORITAKE || ALPHA_PRIMO 382 383config ALPHA_EV56 384 prompt "EV56 CPU (speed >= 400MHz)?" 385 depends on ALPHA_RAWHIDE 386 387config ALPHA_PRIMO 388 bool "EV5 CPU daughtercard (model 5/xxx)?" 389 depends on ALPHA_NORITAKE || ALPHA_MIKASA 390 help 391 Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx. 392 393config ALPHA_GAMMA 394 bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_SABLE 395 depends on ALPHA_SABLE || ALPHA_LYNX 396 default ALPHA_LYNX 397 help 398 Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx. 399 400config ALPHA_T2 401 bool 402 depends on ALPHA_SABLE || ALPHA_LYNX 403 default y 404 405config ALPHA_PYXIS 406 bool 407 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN 408 default y 409 410config ALPHA_EV6 411 bool 412 depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL 413 default y 414 415config ALPHA_TSUNAMI 416 bool 417 depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER 418 default y 419 420config ALPHA_EV67 421 bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER 422 default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL 423 help 424 Is this a machine based on the EV67 core? If in doubt, select N here 425 and the machine will be treated as an EV6. 426 427config ALPHA_MCPCIA 428 bool 429 depends on ALPHA_RAWHIDE 430 default y 431 432config ALPHA_POLARIS 433 bool 434 depends on ALPHA_RX164 435 default y 436 437config ALPHA_IRONGATE 438 bool 439 depends on ALPHA_NAUTILUS 440 default y 441 442config GENERIC_HWEIGHT 443 bool 444 default y if !ALPHA_EV67 445 446config ALPHA_AVANTI 447 bool 448 depends on ALPHA_XL || ALPHA_AVANTI_CH 449 default y 450 help 451 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based 452 Alphas. Info at 453 <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>. 454 455config ALPHA_BROKEN_IRQ_MASK 456 bool 457 depends on ALPHA_GENERIC || ALPHA_PC164 458 default y 459 460config VGA_HOSE 461 bool 462 depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI) 463 default y 464 help 465 Support VGA on an arbitrary hose; needed for several platforms 466 which always have multiple hoses, and whose consoles support it. 467 468 469config ALPHA_QEMU 470 bool "Run under QEMU emulation" 471 depends on !ALPHA_GENERIC 472 help 473 Assume the presence of special features supported by QEMU PALcode 474 that reduce the overhead of system emulation. 475 476 Generic kernels will auto-detect QEMU. But when building a 477 system-specific kernel, the assumption is that we want to 478 eliminate as many runtime tests as possible. 479 480 If unsure, say N. 481 482 483config ALPHA_SRM 484 bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME 485 depends on TTY 486 default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL 487 help 488 There are two different types of booting firmware on Alphas: SRM, 489 which is command line driven, and ARC, which uses menus and arrow 490 keys. Details about the Linux/Alpha booting process are contained in 491 the Linux/Alpha FAQ, accessible on the WWW from 492 <http://www.alphalinux.org/>. 493 494 The usual way to load Linux on an Alpha machine is to use MILO 495 (a bootloader that lets you pass command line parameters to the 496 kernel just like lilo does for the x86 architecture) which can be 497 loaded either from ARC or can be installed directly as a permanent 498 firmware replacement from floppy (which requires changing a certain 499 jumper on the motherboard). If you want to do either of these, say N 500 here. If MILO doesn't work on your system (true for Jensen 501 motherboards), you can bypass it altogether and boot Linux directly 502 from an SRM console; say Y here in order to do that. Note that you 503 won't be able to boot from an IDE disk using SRM. 504 505 If unsure, say N. 506 507config ARCH_MAY_HAVE_PC_FDC 508 def_bool y 509 510config SMP 511 bool "Symmetric multi-processing support" 512 depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL 513 help 514 This enables support for systems with more than one CPU. If you have 515 a system with only one CPU, say N. If you have a system with more 516 than one CPU, say Y. 517 518 If you say N here, the kernel will run on uni- and multiprocessor 519 machines, but will use only one CPU of a multiprocessor machine. If 520 you say Y here, the kernel will run on many, but not all, 521 uniprocessor machines. On a uniprocessor machine, the kernel 522 will run faster if you say N here. 523 524 See also the SMP-HOWTO available at 525 <https://www.tldp.org/docs.html#howto>. 526 527 If you don't know what to do here, say N. 528 529config NR_CPUS 530 int "Maximum number of CPUs (2-32)" 531 range 2 32 532 depends on SMP 533 default "32" if ALPHA_GENERIC || ALPHA_MARVEL 534 default "4" if !ALPHA_GENERIC && !ALPHA_MARVEL 535 help 536 MARVEL support can handle a maximum of 32 CPUs, all the others 537 with working support have a maximum of 4 CPUs. 538 539config ARCH_SPARSEMEM_ENABLE 540 bool "Sparse Memory Support" 541 help 542 Say Y to support efficient handling of discontiguous physical memory, 543 for systems that have huge holes in the physical address space. 544 545config ALPHA_WTINT 546 bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC 547 default y if ALPHA_QEMU 548 default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA) 549 default n if !ALPHA_SRM && !ALPHA_GENERIC 550 default y if SMP 551 help 552 The Wait for Interrupt (WTINT) PALcall attempts to place the CPU 553 to sleep until the next interrupt. This may reduce the power 554 consumed, and the heat produced by the computer. However, it has 555 the side effect of making the cycle counter unreliable as a timing 556 device across the sleep. 557 558 For emulation under QEMU, definitely say Y here, as we have other 559 mechanisms for measuring time than the cycle counter. 560 561 For EV4 (but not LCA), EV5 and EV56 systems, or for systems running 562 MILO, sleep mode is not supported so you might as well say N here. 563 564 For SMP systems we cannot use the cycle counter for timing anyway, 565 so you might as well say Y here. 566 567 If unsure, say N. 568 569# LARGE_VMALLOC is racy, if you *really* need it then fix it first 570config ALPHA_LARGE_VMALLOC 571 bool 572 help 573 Process creation and other aspects of virtual memory management can 574 be streamlined if we restrict the kernel to one PGD for all vmalloc 575 allocations. This equates to about 8GB. 576 577 Under normal circumstances, this is so far and above what is needed 578 as to be laughable. However, there are certain applications (such 579 as benchmark-grade in-kernel web serving) that can make use of as 580 much vmalloc space as is available. 581 582 Say N unless you know you need gobs and gobs of vmalloc space. 583 584config VERBOSE_MCHECK 585 bool "Verbose Machine Checks" 586 587config VERBOSE_MCHECK_ON 588 int "Verbose Printing Mode (0=off, 1=on, 2=all)" 589 depends on VERBOSE_MCHECK 590 default 1 591 help 592 This option allows the default printing mode to be set, and then 593 possibly overridden by a boot command argument. 594 595 For example, if one wanted the option of printing verbose 596 machine checks, but wanted the default to be as if verbose 597 machine check printing was turned off, then one would choose 598 the printing mode to be 0. Then, upon reboot, one could add 599 the boot command line "verbose_mcheck=1" to get the normal 600 verbose machine check printing, or "verbose_mcheck=2" to get 601 the maximum information available. 602 603 Take the default (1) unless you want more control or more info. 604 605choice 606 prompt "Timer interrupt frequency (HZ)?" 607 default HZ_128 if ALPHA_QEMU 608 default HZ_1200 if ALPHA_RAWHIDE 609 default HZ_1024 610 help 611 The frequency at which timer interrupts occur. A high frequency 612 minimizes latency, whereas a low frequency minimizes overhead of 613 process accounting. The later effect is especially significant 614 when being run under QEMU. 615 616 Note that some Alpha hardware cannot change the interrupt frequency 617 of the timer. If unsure, say 1024 (or 1200 for Rawhide). 618 619 config HZ_32 620 bool "32 Hz" 621 config HZ_64 622 bool "64 Hz" 623 config HZ_128 624 bool "128 Hz" 625 config HZ_256 626 bool "256 Hz" 627 config HZ_1024 628 bool "1024 Hz" 629 config HZ_1200 630 bool "1200 Hz" 631endchoice 632 633config HZ 634 int 635 default 32 if HZ_32 636 default 64 if HZ_64 637 default 128 if HZ_128 638 default 256 if HZ_256 639 default 1200 if HZ_1200 640 default 1024 641 642config SRM_ENV 643 tristate "SRM environment through procfs" 644 depends on PROC_FS 645 help 646 If you enable this option, a subdirectory inside /proc called 647 /proc/srm_environment will give you access to the all important 648 SRM environment variables (those which have a name) and also 649 to all others (by their internal number). 650 651 SRM is something like a BIOS for Alpha machines. There are some 652 other such BIOSes, like AlphaBIOS, which this driver cannot 653 support (hey, that's not SRM!). 654 655 Despite the fact that this driver doesn't work on all Alphas (but 656 only on those which have SRM as their firmware), it's save to 657 build it even if your particular machine doesn't know about SRM 658 (or if you intend to compile a generic kernel). It will simply 659 not create those subdirectory in /proc (and give you some warning, 660 of course). 661 662 This driver is also available as a module and will be called 663 srm_env then. 664 665endmenu 666 667# DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig 668# but we also need it if VGA_HOSE is set 669config DUMMY_CONSOLE 670 bool 671 depends on VGA_HOSE 672 default y 673