1# SPDX-License-Identifier: GPL-2.0 2config ALPHA 3 bool 4 default y 5 select ARCH_32BIT_USTAT_F_TINODE 6 select ARCH_MIGHT_HAVE_PC_PARPORT 7 select ARCH_MIGHT_HAVE_PC_SERIO 8 select ARCH_NO_PREEMPT 9 select ARCH_NO_SG_CHAIN 10 select ARCH_USE_CMPXCHG_LOCKREF 11 select DMA_OPS if PCI 12 select FORCE_PCI if !ALPHA_JENSEN 13 select PCI_DOMAINS if PCI 14 select PCI_SYSCALL if PCI 15 select HAVE_AOUT 16 select HAVE_ASM_MODVERSIONS 17 select HAVE_PCSPKR_PLATFORM 18 select HAVE_PERF_EVENTS 19 select NEED_DMA_MAP_STATE 20 select NEED_SG_DMA_LENGTH 21 select VIRT_TO_BUS 22 select GENERIC_IRQ_PROBE 23 select GENERIC_PCI_IOMAP if PCI 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 HAVE_ARCH_AUDITSYSCALL 32 select HAVE_MOD_ARCH_SPECIFIC 33 select MODULES_USE_ELF_RELA 34 select ODD_RT_SIGACTION 35 select OLD_SIGSUSPEND 36 select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67 37 select MMU_GATHER_NO_RANGE 38 select SET_FS 39 select SPARSEMEM_EXTREME if SPARSEMEM 40 select ZONE_DMA 41 help 42 The Alpha is a 64-bit general-purpose processor designed and 43 marketed by the Digital Equipment Corporation of blessed memory, 44 now Hewlett-Packard. The Alpha Linux project has a home page at 45 <http://www.alphalinux.org/>. 46 47config 64BIT 48 def_bool y 49 50config MMU 51 bool 52 default y 53 54config ARCH_HAS_ILOG2_U32 55 bool 56 default n 57 58config ARCH_HAS_ILOG2_U64 59 bool 60 default n 61 62config GENERIC_CALIBRATE_DELAY 63 bool 64 default y 65 66config GENERIC_ISA_DMA 67 bool 68 default y 69 70config PGTABLE_LEVELS 71 int 72 default 3 73 74config AUDIT_ARCH 75 bool 76 77menu "System setup" 78 79choice 80 prompt "Alpha system type" 81 default ALPHA_GENERIC 82 help 83 This is the system type of your hardware. A "generic" kernel will 84 run on any supported Alpha system. However, if you configure a 85 kernel for your specific system, it will be faster and smaller. 86 87 To find out what type of Alpha system you have, you may want to 88 check out the Linux/Alpha FAQ, accessible on the WWW from 89 <http://www.alphalinux.org/>. In summary: 90 91 Alcor/Alpha-XLT AS 600, AS 500, XL-300, XL-366 92 Alpha-XL XL-233, XL-266 93 AlphaBook1 Alpha laptop 94 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, AS 400 95 Cabriolet AlphaPC64, AlphaPCI64 96 DP264 DP264 / DS20 / ES40 / DS10 / DS10L 97 EB164 EB164 21164 evaluation board 98 EB64+ EB64+ 21064 evaluation board 99 EB66 EB66 21066 evaluation board 100 EB66+ EB66+ 21066 evaluation board 101 Jensen DECpc 150, DEC 2000 models 300, 500 102 LX164 AlphaPC164-LX 103 Lynx AS 2100A 104 Miata Personal Workstation 433/500/600 a/au 105 Marvel AlphaServer ES47 / ES80 / GS1280 106 Mikasa AS 1000 107 Noname AXPpci33, UDB (Multia) 108 Noritake AS 1000A, AS 600A, AS 800 109 PC164 AlphaPC164 110 Rawhide AS 1200, AS 4000, AS 4100 111 Ruffian RPX164-2, AlphaPC164-UX, AlphaPC164-BX 112 SX164 AlphaPC164-SX 113 Sable AS 2000, AS 2100 114 Shark DS 20L 115 Takara Takara (OEM) 116 Titan AlphaServer ES45 / DS25 / DS15 117 Wildfire AlphaServer GS 40/80/160/320 118 119 If you don't know what to do, choose "generic". 120 121config ALPHA_GENERIC 122 bool "Generic" 123 depends on TTY 124 select HAVE_EISA 125 help 126 A generic kernel will run on all supported Alpha hardware. 127 128config ALPHA_ALCOR 129 bool "Alcor/Alpha-XLT" 130 select HAVE_EISA 131 help 132 For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data 133 slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O 134 Address, CIA) - a 383 pin plastic PGA). It provides a DRAM 135 controller (256-bit memory bus) and a PCI interface. It also does 136 all the work required to support an external Bcache and to maintain 137 memory coherence when a PCI device DMAs into (or out of) memory. 138 139config ALPHA_XL 140 bool "Alpha-XL" 141 help 142 XL-233 and XL-266-based Alpha systems. 143 144config ALPHA_BOOK1 145 bool "AlphaBook1" 146 help 147 Dec AlphaBook1/Burns Alpha-based laptops. 148 149config ALPHA_AVANTI_CH 150 bool "Avanti" 151 152config ALPHA_CABRIOLET 153 bool "Cabriolet" 154 help 155 Cabriolet AlphaPC64, AlphaPCI64 systems. Derived from EB64+ but now 156 baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA 157 slots, 4 PCI slots (one pair are on a shared slot), uses plug-in 158 Bcache SIMMs. Requires power supply with 3.3V output. 159 160config ALPHA_DP264 161 bool "DP264" 162 help 163 Various 21264 systems with the tsunami core logic chipset. 164 API Networks: 264DP, UP2000(+), CS20; 165 Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40. 166 167config ALPHA_EB164 168 bool "EB164" 169 help 170 EB164 21164 evaluation board from DEC. Uses 21164 and ALCOR. Has 171 ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is 172 shared with an ISA slot) and 2 32-bit PCI slots. Uses plus-in 173 Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD, 174 MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized 175 motherboard. Requires power supply with 3.3V output. 176 177config ALPHA_EB64P_CH 178 bool "EB64+" 179 180config ALPHA_EB66 181 bool "EB66" 182 help 183 A Digital DS group board. Uses 21066 or 21066A. I/O sub-system is 184 identical to EB64+. Baby PC-AT size. Runs from standard PC power 185 supply. The EB66 schematic was published as a marketing poster 186 advertising the 21066 as "the first microprocessor in the world with 187 embedded PCI". 188 189config ALPHA_EB66P 190 bool "EB66+" 191 help 192 Later variant of the EB66 board. 193 194config ALPHA_EIGER 195 bool "Eiger" 196 help 197 Apparently an obscure OEM single-board computer based on the 198 Typhoon/Tsunami chipset family. Information on it is scanty. 199 200config ALPHA_JENSEN 201 bool "Jensen" 202 depends on BROKEN 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 343config ALPHA_LCA 344 bool 345 depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K 346 default y 347 348config ALPHA_APECS 349 bool 350 depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL 351 default y 352 353config ALPHA_EB64P 354 bool 355 depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH 356 default y 357 help 358 Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3 ISA, 359 2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs. 360 ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI 361 (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style), 362 SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM. PC-AT size. 363 Runs from standard PC power supply. 364 365config ALPHA_EV5 366 bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX 367 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 368 369config ALPHA_EV4 370 bool 371 default y if ALPHA_LYNX && !ALPHA_EV5 372 373config ALPHA_CIA 374 bool 375 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 376 default y 377 378config ALPHA_EV56 379 bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR 380 default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA 381 382config ALPHA_EV56 383 prompt "EV56 CPU (speed >= 333MHz)?" 384 depends on ALPHA_NORITAKE || ALPHA_PRIMO 385 386config ALPHA_EV56 387 prompt "EV56 CPU (speed >= 400MHz)?" 388 depends on ALPHA_RAWHIDE 389 390config ALPHA_PRIMO 391 bool "EV5 CPU daughtercard (model 5/xxx)?" 392 depends on ALPHA_NORITAKE || ALPHA_MIKASA 393 help 394 Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx. 395 396config ALPHA_GAMMA 397 bool "EV5 CPU(s) (model 5/xxx)?" 398 depends on ALPHA_SABLE 399 help 400 Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx. 401 402config ALPHA_GAMMA 403 bool 404 depends on ALPHA_LYNX 405 default y 406 407config ALPHA_T2 408 bool 409 depends on ALPHA_SABLE || ALPHA_LYNX 410 default y 411 412config ALPHA_PYXIS 413 bool 414 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN 415 default y 416 417config ALPHA_EV6 418 bool 419 depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL 420 default y 421 422config ALPHA_TSUNAMI 423 bool 424 depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER 425 default y 426 427config ALPHA_EV67 428 bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER 429 default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL 430 help 431 Is this a machine based on the EV67 core? If in doubt, select N here 432 and the machine will be treated as an EV6. 433 434config ALPHA_MCPCIA 435 bool 436 depends on ALPHA_RAWHIDE 437 default y 438 439config ALPHA_POLARIS 440 bool 441 depends on ALPHA_RX164 442 default y 443 444config ALPHA_IRONGATE 445 bool 446 depends on ALPHA_NAUTILUS 447 default y 448 449config GENERIC_HWEIGHT 450 bool 451 default y if !ALPHA_EV67 452 453config ALPHA_AVANTI 454 bool 455 depends on ALPHA_XL || ALPHA_AVANTI_CH 456 default y 457 help 458 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based 459 Alphas. Info at 460 <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>. 461 462config ALPHA_BROKEN_IRQ_MASK 463 bool 464 depends on ALPHA_GENERIC || ALPHA_PC164 465 default y 466 467config VGA_HOSE 468 bool 469 depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI) 470 default y 471 help 472 Support VGA on an arbitrary hose; needed for several platforms 473 which always have multiple hoses, and whose consoles support it. 474 475 476config ALPHA_QEMU 477 bool "Run under QEMU emulation" 478 depends on !ALPHA_GENERIC 479 help 480 Assume the presence of special features supported by QEMU PALcode 481 that reduce the overhead of system emulation. 482 483 Generic kernels will auto-detect QEMU. But when building a 484 system-specific kernel, the assumption is that we want to 485 eliminate as many runtime tests as possible. 486 487 If unsure, say N. 488 489 490config ALPHA_SRM 491 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 492 depends on TTY 493 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 494 help 495 There are two different types of booting firmware on Alphas: SRM, 496 which is command line driven, and ARC, which uses menus and arrow 497 keys. Details about the Linux/Alpha booting process are contained in 498 the Linux/Alpha FAQ, accessible on the WWW from 499 <http://www.alphalinux.org/>. 500 501 The usual way to load Linux on an Alpha machine is to use MILO 502 (a bootloader that lets you pass command line parameters to the 503 kernel just like lilo does for the x86 architecture) which can be 504 loaded either from ARC or can be installed directly as a permanent 505 firmware replacement from floppy (which requires changing a certain 506 jumper on the motherboard). If you want to do either of these, say N 507 here. If MILO doesn't work on your system (true for Jensen 508 motherboards), you can bypass it altogether and boot Linux directly 509 from an SRM console; say Y here in order to do that. Note that you 510 won't be able to boot from an IDE disk using SRM. 511 512 If unsure, say N. 513 514config ARCH_MAY_HAVE_PC_FDC 515 def_bool y 516 517config SMP 518 bool "Symmetric multi-processing support" 519 depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL 520 help 521 This enables support for systems with more than one CPU. If you have 522 a system with only one CPU, say N. If you have a system with more 523 than one CPU, say Y. 524 525 If you say N here, the kernel will run on uni- and multiprocessor 526 machines, but will use only one CPU of a multiprocessor machine. If 527 you say Y here, the kernel will run on many, but not all, 528 uniprocessor machines. On a uniprocessor machine, the kernel 529 will run faster if you say N here. 530 531 See also the SMP-HOWTO available at 532 <https://www.tldp.org/docs.html#howto>. 533 534 If you don't know what to do here, say N. 535 536config NR_CPUS 537 int "Maximum number of CPUs (2-32)" 538 range 2 32 539 depends on SMP 540 default "32" if ALPHA_GENERIC || ALPHA_MARVEL 541 default "4" if !ALPHA_GENERIC && !ALPHA_MARVEL 542 help 543 MARVEL support can handle a maximum of 32 CPUs, all the others 544 with working support have a maximum of 4 CPUs. 545 546config ARCH_SPARSEMEM_ENABLE 547 bool "Sparse Memory Support" 548 help 549 Say Y to support efficient handling of discontiguous physical memory, 550 for systems that have huge holes in the physical address space. 551 552config ALPHA_WTINT 553 bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC 554 default y if ALPHA_QEMU 555 default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA) 556 default n if !ALPHA_SRM && !ALPHA_GENERIC 557 default y if SMP 558 help 559 The Wait for Interrupt (WTINT) PALcall attempts to place the CPU 560 to sleep until the next interrupt. This may reduce the power 561 consumed, and the heat produced by the computer. However, it has 562 the side effect of making the cycle counter unreliable as a timing 563 device across the sleep. 564 565 For emulation under QEMU, definitely say Y here, as we have other 566 mechanisms for measuring time than the cycle counter. 567 568 For EV4 (but not LCA), EV5 and EV56 systems, or for systems running 569 MILO, sleep mode is not supported so you might as well say N here. 570 571 For SMP systems we cannot use the cycle counter for timing anyway, 572 so you might as well say Y here. 573 574 If unsure, say N. 575 576# LARGE_VMALLOC is racy, if you *really* need it then fix it first 577config ALPHA_LARGE_VMALLOC 578 bool 579 help 580 Process creation and other aspects of virtual memory management can 581 be streamlined if we restrict the kernel to one PGD for all vmalloc 582 allocations. This equates to about 8GB. 583 584 Under normal circumstances, this is so far and above what is needed 585 as to be laughable. However, there are certain applications (such 586 as benchmark-grade in-kernel web serving) that can make use of as 587 much vmalloc space as is available. 588 589 Say N unless you know you need gobs and gobs of vmalloc space. 590 591config VERBOSE_MCHECK 592 bool "Verbose Machine Checks" 593 594config VERBOSE_MCHECK_ON 595 int "Verbose Printing Mode (0=off, 1=on, 2=all)" 596 depends on VERBOSE_MCHECK 597 default 1 598 help 599 This option allows the default printing mode to be set, and then 600 possibly overridden by a boot command argument. 601 602 For example, if one wanted the option of printing verbose 603 machine checks, but wanted the default to be as if verbose 604 machine check printing was turned off, then one would choose 605 the printing mode to be 0. Then, upon reboot, one could add 606 the boot command line "verbose_mcheck=1" to get the normal 607 verbose machine check printing, or "verbose_mcheck=2" to get 608 the maximum information available. 609 610 Take the default (1) unless you want more control or more info. 611 612choice 613 prompt "Timer interrupt frequency (HZ)?" 614 default HZ_128 if ALPHA_QEMU 615 default HZ_1200 if ALPHA_RAWHIDE 616 default HZ_1024 617 help 618 The frequency at which timer interrupts occur. A high frequency 619 minimizes latency, whereas a low frequency minimizes overhead of 620 process accounting. The later effect is especially significant 621 when being run under QEMU. 622 623 Note that some Alpha hardware cannot change the interrupt frequency 624 of the timer. If unsure, say 1024 (or 1200 for Rawhide). 625 626 config HZ_32 627 bool "32 Hz" 628 config HZ_64 629 bool "64 Hz" 630 config HZ_128 631 bool "128 Hz" 632 config HZ_256 633 bool "256 Hz" 634 config HZ_1024 635 bool "1024 Hz" 636 config HZ_1200 637 bool "1200 Hz" 638endchoice 639 640config HZ 641 int 642 default 32 if HZ_32 643 default 64 if HZ_64 644 default 128 if HZ_128 645 default 256 if HZ_256 646 default 1200 if HZ_1200 647 default 1024 648 649config SRM_ENV 650 tristate "SRM environment through procfs" 651 depends on PROC_FS 652 help 653 If you enable this option, a subdirectory inside /proc called 654 /proc/srm_environment will give you access to the all important 655 SRM environment variables (those which have a name) and also 656 to all others (by their internal number). 657 658 SRM is something like a BIOS for Alpha machines. There are some 659 other such BIOSes, like AlphaBIOS, which this driver cannot 660 support (hey, that's not SRM!). 661 662 Despite the fact that this driver doesn't work on all Alphas (but 663 only on those which have SRM as their firmware), it's save to 664 build it even if your particular machine doesn't know about SRM 665 (or if you intend to compile a generic kernel). It will simply 666 not create those subdirectory in /proc (and give you some warning, 667 of course). 668 669 This driver is also available as a module and will be called 670 srm_env then. 671 672endmenu 673 674# DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig 675# but we also need it if VGA_HOSE is set 676config DUMMY_CONSOLE 677 bool 678 depends on VGA_HOSE 679 default y 680