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TOMOYO Linux Cross Reference
Linux/arch/alpha/Kconfig

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  1 # SPDX-License-Identifier: GPL-2.0
  2 config ALPHA
  3         bool
  4         default y
  5         select ARCH_MIGHT_HAVE_PC_PARPORT
  6         select ARCH_MIGHT_HAVE_PC_SERIO
  7         select ARCH_NO_PREEMPT
  8         select ARCH_NO_SG_CHAIN
  9         select ARCH_USE_CMPXCHG_LOCKREF
 10         select FORCE_PCI if !ALPHA_JENSEN
 11         select PCI_DOMAINS if PCI
 12         select PCI_SYSCALL if PCI
 13         select HAVE_AOUT
 14         select HAVE_ASM_MODVERSIONS
 15         select HAVE_IDE
 16         select HAVE_OPROFILE
 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_CLOCKEVENTS
 30         select GENERIC_CPU_VULNERABILITIES
 31         select GENERIC_SMP_IDLE_THREAD
 32         select GENERIC_STRNCPY_FROM_USER
 33         select GENERIC_STRNLEN_USER
 34         select HAVE_ARCH_AUDITSYSCALL
 35         select HAVE_MOD_ARCH_SPECIFIC
 36         select MODULES_USE_ELF_RELA
 37         select ODD_RT_SIGACTION
 38         select OLD_SIGSUSPEND
 39         select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
 40         select MMU_GATHER_NO_RANGE
 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 
 47 config 64BIT
 48         def_bool y
 49 
 50 config MMU
 51         bool
 52         default y
 53 
 54 config ARCH_HAS_ILOG2_U32
 55         bool
 56         default n
 57 
 58 config ARCH_HAS_ILOG2_U64
 59         bool
 60         default n
 61 
 62 config GENERIC_CALIBRATE_DELAY
 63         bool
 64         default y
 65 
 66 config ZONE_DMA
 67         bool
 68         default y
 69 
 70 config GENERIC_ISA_DMA
 71         bool
 72         default y
 73 
 74 config PGTABLE_LEVELS
 75         int
 76         default 3
 77 
 78 config AUDIT_ARCH
 79         bool
 80 
 81 menu "System setup"
 82 
 83 choice
 84         prompt "Alpha system type"
 85         default ALPHA_GENERIC
 86         help
 87           This is the system type of your hardware.  A "generic" kernel will
 88           run on any supported Alpha system. However, if you configure a
 89           kernel for your specific system, it will be faster and smaller.
 90 
 91           To find out what type of Alpha system you have, you may want to
 92           check out the Linux/Alpha FAQ, accessible on the WWW from
 93           <http://www.alphalinux.org/>. In summary:
 94 
 95           Alcor/Alpha-XLT     AS 600, AS 500, XL-300, XL-366
 96           Alpha-XL            XL-233, XL-266
 97           AlphaBook1          Alpha laptop
 98           Avanti              AS 200, AS 205, AS 250, AS 255, AS 300, AS 400
 99           Cabriolet           AlphaPC64, AlphaPCI64
100           DP264               DP264 / DS20 / ES40 / DS10 / DS10L
101           EB164               EB164 21164 evaluation board
102           EB64+               EB64+ 21064 evaluation board
103           EB66                EB66 21066 evaluation board
104           EB66+               EB66+ 21066 evaluation board
105           Jensen              DECpc 150, DEC 2000 models 300, 500
106           LX164               AlphaPC164-LX
107           Lynx                AS 2100A
108           Miata               Personal Workstation 433/500/600 a/au
109           Marvel              AlphaServer ES47 / ES80 / GS1280
110           Mikasa              AS 1000
111           Noname              AXPpci33, UDB (Multia)
112           Noritake            AS 1000A, AS 600A, AS 800
113           PC164               AlphaPC164
114           Rawhide             AS 1200, AS 4000, AS 4100
115           Ruffian             RPX164-2, AlphaPC164-UX, AlphaPC164-BX
116           SX164               AlphaPC164-SX
117           Sable               AS 2000, AS 2100
118           Shark               DS 20L
119           Takara              Takara (OEM)
120           Titan               AlphaServer ES45 / DS25 / DS15
121           Wildfire            AlphaServer GS 40/80/160/320
122 
123           If you don't know what to do, choose "generic".
124 
125 config ALPHA_GENERIC
126         bool "Generic"
127         depends on TTY
128         select HAVE_EISA
129         help
130           A generic kernel will run on all supported Alpha hardware.
131 
132 config ALPHA_ALCOR
133         bool "Alcor/Alpha-XLT"
134         select HAVE_EISA
135         help
136           For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
137           slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
138           Address, CIA) - a 383 pin plastic PGA).  It provides a DRAM
139           controller (256-bit memory bus) and a PCI interface.  It also does
140           all the work required to support an external Bcache and to maintain
141           memory coherence when a PCI device DMAs into (or out of) memory.
142 
143 config ALPHA_XL
144         bool "Alpha-XL"
145         help
146           XL-233 and XL-266-based Alpha systems.
147 
148 config ALPHA_BOOK1
149         bool "AlphaBook1"
150         help
151           Dec AlphaBook1/Burns Alpha-based laptops.
152 
153 config ALPHA_AVANTI_CH
154         bool "Avanti"
155 
156 config ALPHA_CABRIOLET
157         bool "Cabriolet"
158         help
159           Cabriolet AlphaPC64, AlphaPCI64 systems.  Derived from EB64+ but now
160           baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA
161           slots, 4 PCI slots (one pair are on a shared slot), uses plug-in
162           Bcache SIMMs.  Requires power supply with 3.3V output.
163 
164 config ALPHA_DP264
165         bool "DP264"
166         help
167           Various 21264 systems with the tsunami core logic chipset.
168           API Networks: 264DP, UP2000(+), CS20;
169           Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40.
170 
171 config ALPHA_EB164
172         bool "EB164"
173         help
174           EB164 21164 evaluation board from DEC.  Uses 21164 and ALCOR.  Has
175           ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is
176           shared with an ISA slot) and 2 32-bit PCI slots.  Uses plus-in
177           Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD,
178           MOUSE (PS2 style), RTC/NVRAM.  Boot ROM is Flash.  PC-AT-sized
179           motherboard.  Requires power supply with 3.3V output.
180 
181 config ALPHA_EB64P_CH
182         bool "EB64+"
183 
184 config ALPHA_EB66
185         bool "EB66"
186         help
187           A Digital DS group board.  Uses 21066 or 21066A.  I/O sub-system is
188           identical to EB64+.  Baby PC-AT size.  Runs from standard PC power
189           supply.  The EB66 schematic was published as a marketing poster
190           advertising the 21066 as "the first microprocessor in the world with
191           embedded PCI".
192 
193 config ALPHA_EB66P
194         bool "EB66+"
195         help
196           Later variant of the EB66 board.
197 
198 config ALPHA_EIGER
199         bool "Eiger"
200         help
201           Apparently an obscure OEM single-board computer based on the
202           Typhoon/Tsunami chipset family. Information on it is scanty.
203 
204 config ALPHA_JENSEN
205         bool "Jensen"
206         depends on BROKEN
207         select HAVE_EISA
208         help
209           DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
210           of the first-generation Alpha systems. A number of these systems
211           seem to be available on the second- hand market. The Jensen is a
212           floor-standing tower system which originally used a 150MHz 21064 It
213           used programmable logic to interface a 486 EISA I/O bridge to the
214           CPU.
215 
216 config ALPHA_LX164
217         bool "LX164"
218         help
219           A technical overview of this board is available at
220           <http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>.
221 
222 config ALPHA_LYNX
223         bool "Lynx"
224         select HAVE_EISA
225         help
226           AlphaServer 2100A-based systems.
227 
228 config ALPHA_MARVEL
229         bool "Marvel"
230         help
231           AlphaServer ES47 / ES80 / GS1280 based on EV7.
232 
233 config ALPHA_MIATA
234         bool "Miata"
235         select HAVE_EISA
236         help
237           The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a,
238           or 600au).
239 
240 config ALPHA_MIKASA
241         bool "Mikasa"
242         help
243           AlphaServer 1000-based Alpha systems.
244 
245 config ALPHA_NAUTILUS
246         bool "Nautilus"
247         help
248           Alpha systems based on the AMD 751 & ALI 1543C chipsets.
249 
250 config ALPHA_NONAME_CH
251         bool "Noname"
252 
253 config ALPHA_NORITAKE
254         bool "Noritake"
255         select HAVE_EISA
256         help
257           AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based
258           systems.
259 
260 config ALPHA_PC164
261         bool "PC164"
262 
263 config ALPHA_P2K
264         bool "Platform2000"
265 
266 config ALPHA_RAWHIDE
267         bool "Rawhide"
268         select HAVE_EISA
269         help
270           AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines.
271           See HOWTO at
272           <http://www.alphalinux.org/docs/rawhide/4100_install.shtml>.
273 
274 config ALPHA_RUFFIAN
275         bool "Ruffian"
276         help
277           Samsung APC164UX.  There is a page on known problems and workarounds
278           at <http://www.alphalinux.org/faq/FAQ-11.html>.
279 
280 config ALPHA_RX164
281         bool "RX164"
282 
283 config ALPHA_SX164
284         bool "SX164"
285 
286 config ALPHA_SABLE
287         bool "Sable"
288         select HAVE_EISA
289         help
290           Digital AlphaServer 2000 and 2100-based systems.
291 
292 config ALPHA_SHARK
293         bool "Shark"
294 
295 config ALPHA_TAKARA
296         bool "Takara"
297         help
298           Alpha 11164-based OEM single-board computer.
299 
300 config ALPHA_TITAN
301         bool "Titan"
302         help
303           AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset.
304 
305 config ALPHA_WILDFIRE
306         bool "Wildfire"
307         help
308           AlphaServer GS 40/80/160/320 SMP based on the EV67 core.
309 
310 endchoice
311 
312 # clear all implied options (don't want default values for those):
313 # Most of these machines have ISA slots; not exactly sure which don't,
314 # and this doesn't activate hordes of code, so do it always.
315 config ISA
316         bool
317         default y
318         help
319           Find out whether you have ISA slots on your motherboard.  ISA is the
320           name of a bus system, i.e. the way the CPU talks to the other stuff
321           inside your box.  Other bus systems are PCI, EISA, MicroChannel
322           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
323           newer boards don't support it.  If you have ISA, say Y, otherwise N.
324 
325 config ISA_DMA_API
326         bool
327         default y
328 
329 config ALPHA_NONAME
330         bool
331         depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
332         default y
333         help
334           The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia
335           UDB).  This design was produced by Digital's Technical OEM (TOEM)
336           group. It uses the 21066 processor running at 166MHz or 233MHz. It
337           is a baby-AT size, and runs from a standard PC power supply. It has
338           5 ISA slots and 3 PCI slots (one pair are a shared slot). There are
339           2 versions, with either PS/2 or large DIN connectors for the
340           keyboard.
341 
342 config ALPHA_EV4
343         bool
344         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
345         default y if !ALPHA_LYNX
346 
347 config ALPHA_LCA
348         bool
349         depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
350         default y
351 
352 config ALPHA_APECS
353         bool
354         depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL
355         default y
356 
357 config ALPHA_EB64P
358         bool
359         depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH
360         default y
361         help
362           Uses 21064 or 21064A and APECs.  Has ISA and PCI expansion (3 ISA,
363           2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs.
364           ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI
365           (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style),
366           SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM.  PC-AT size.
367           Runs from standard PC power supply.
368 
369 config ALPHA_EV5
370         bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX
371         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
372 
373 config ALPHA_EV4
374         bool
375         default y if ALPHA_LYNX && !ALPHA_EV5
376 
377 config ALPHA_CIA
378         bool
379         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
380         default y
381 
382 config ALPHA_EV56
383         bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR
384         default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA
385 
386 config ALPHA_EV56
387         prompt "EV56 CPU (speed >= 333MHz)?"
388         depends on ALPHA_NORITAKE || ALPHA_PRIMO
389 
390 config ALPHA_EV56
391         prompt "EV56 CPU (speed >= 400MHz)?"
392         depends on ALPHA_RAWHIDE
393 
394 config ALPHA_PRIMO
395         bool "EV5 CPU daughtercard (model 5/xxx)?"
396         depends on ALPHA_NORITAKE || ALPHA_MIKASA
397         help
398           Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx.
399 
400 config ALPHA_GAMMA
401         bool "EV5 CPU(s) (model 5/xxx)?"
402         depends on ALPHA_SABLE
403         help
404           Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx.
405 
406 config ALPHA_GAMMA
407         bool
408         depends on ALPHA_LYNX
409         default y
410 
411 config ALPHA_T2
412         bool
413         depends on ALPHA_SABLE || ALPHA_LYNX
414         default y
415 
416 config ALPHA_PYXIS
417         bool
418         depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
419         default y
420 
421 config ALPHA_EV6
422         bool
423         depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
424         default y
425 
426 config ALPHA_TSUNAMI
427         bool
428         depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
429         default y
430 
431 config ALPHA_EV67
432         bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
433         default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
434         help
435           Is this a machine based on the EV67 core?  If in doubt, select N here
436           and the machine will be treated as an EV6.
437 
438 config ALPHA_MCPCIA
439         bool
440         depends on ALPHA_RAWHIDE
441         default y
442 
443 config ALPHA_POLARIS
444         bool
445         depends on ALPHA_RX164
446         default y
447 
448 config ALPHA_IRONGATE
449         bool
450         depends on ALPHA_NAUTILUS
451         default y
452 
453 config GENERIC_HWEIGHT
454         bool
455         default y if !ALPHA_EV67
456 
457 config ALPHA_AVANTI
458         bool
459         depends on ALPHA_XL || ALPHA_AVANTI_CH
460         default y
461         help
462           Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based
463           Alphas. Info at
464           <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>.
465 
466 config ALPHA_BROKEN_IRQ_MASK
467         bool
468         depends on ALPHA_GENERIC || ALPHA_PC164
469         default y
470 
471 config VGA_HOSE
472         bool
473         depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI)
474         default y
475         help
476           Support VGA on an arbitrary hose; needed for several platforms
477           which always have multiple hoses, and whose consoles support it.
478 
479 
480 config ALPHA_QEMU
481         bool "Run under QEMU emulation"
482         depends on !ALPHA_GENERIC
483         help
484           Assume the presence of special features supported by QEMU PALcode
485           that reduce the overhead of system emulation.
486 
487           Generic kernels will auto-detect QEMU.  But when building a
488           system-specific kernel, the assumption is that we want to
489           eliminate as many runtime tests as possible.
490 
491           If unsure, say N.
492 
493 
494 config ALPHA_SRM
495         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
496         depends on TTY
497         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
498         help
499           There are two different types of booting firmware on Alphas: SRM,
500           which is command line driven, and ARC, which uses menus and arrow
501           keys. Details about the Linux/Alpha booting process are contained in
502           the Linux/Alpha FAQ, accessible on the WWW from
503           <http://www.alphalinux.org/>.
504 
505           The usual way to load Linux on an Alpha machine is to use MILO
506           (a bootloader that lets you pass command line parameters to the
507           kernel just like lilo does for the x86 architecture) which can be
508           loaded either from ARC or can be installed directly as a permanent
509           firmware replacement from floppy (which requires changing a certain
510           jumper on the motherboard). If you want to do either of these, say N
511           here. If MILO doesn't work on your system (true for Jensen
512           motherboards), you can bypass it altogether and boot Linux directly
513           from an SRM console; say Y here in order to do that. Note that you
514           won't be able to boot from an IDE disk using SRM.
515 
516           If unsure, say N.
517 
518 config ARCH_MAY_HAVE_PC_FDC
519         def_bool y
520 
521 config SMP
522         bool "Symmetric multi-processing support"
523         depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
524         help
525           This enables support for systems with more than one CPU. If you have
526           a system with only one CPU, say N. If you have a system with more
527           than one CPU, say Y.
528 
529           If you say N here, the kernel will run on uni- and multiprocessor
530           machines, but will use only one CPU of a multiprocessor machine. If
531           you say Y here, the kernel will run on many, but not all,
532           uniprocessor machines. On a uniprocessor machine, the kernel
533           will run faster if you say N here.
534 
535           See also the SMP-HOWTO available at
536           <http://www.tldp.org/docs.html#howto>.
537 
538           If you don't know what to do here, say N.
539 
540 config NR_CPUS
541         int "Maximum number of CPUs (2-32)"
542         range 2 32
543         depends on SMP
544         default "32" if ALPHA_GENERIC || ALPHA_MARVEL
545         default "4" if !ALPHA_GENERIC && !ALPHA_MARVEL
546         help
547           MARVEL support can handle a maximum of 32 CPUs, all the others
548           with working support have a maximum of 4 CPUs.
549 
550 config ARCH_DISCONTIGMEM_ENABLE
551         bool "Discontiguous Memory Support"
552         help
553           Say Y to support efficient handling of discontiguous physical memory,
554           for architectures which are either NUMA (Non-Uniform Memory Access)
555           or have huge holes in the physical address space for other reasons.
556           See <file:Documentation/vm/numa.rst> for more.
557 
558 config NUMA
559         bool "NUMA Support (EXPERIMENTAL)"
560         depends on DISCONTIGMEM && BROKEN
561         help
562           Say Y to compile the kernel to support NUMA (Non-Uniform Memory
563           Access).  This option is for configuring high-end multiprocessor
564           server machines.  If in doubt, say N.
565 
566 config ALPHA_WTINT
567         bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
568         default y if ALPHA_QEMU
569         default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA)
570         default n if !ALPHA_SRM && !ALPHA_GENERIC
571         default y if SMP
572         help
573           The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
574           to sleep until the next interrupt.  This may reduce the power
575           consumed, and the heat produced by the computer.  However, it has
576           the side effect of making the cycle counter unreliable as a timing
577           device across the sleep.
578 
579           For emulation under QEMU, definitely say Y here, as we have other
580           mechanisms for measuring time than the cycle counter.
581 
582           For EV4 (but not LCA), EV5 and EV56 systems, or for systems running
583           MILO, sleep mode is not supported so you might as well say N here.
584 
585           For SMP systems we cannot use the cycle counter for timing anyway,
586           so you might as well say Y here.
587 
588           If unsure, say N.
589 
590 config NODES_SHIFT
591         int
592         default "7"
593         depends on NEED_MULTIPLE_NODES
594 
595 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
596 config ALPHA_LARGE_VMALLOC
597         bool
598         help
599           Process creation and other aspects of virtual memory management can
600           be streamlined if we restrict the kernel to one PGD for all vmalloc
601           allocations.  This equates to about 8GB.
602 
603           Under normal circumstances, this is so far and above what is needed
604           as to be laughable.  However, there are certain applications (such
605           as benchmark-grade in-kernel web serving) that can make use of as
606           much vmalloc space as is available.
607 
608           Say N unless you know you need gobs and gobs of vmalloc space.
609 
610 config VERBOSE_MCHECK
611         bool "Verbose Machine Checks"
612 
613 config VERBOSE_MCHECK_ON
614         int "Verbose Printing Mode (0=off, 1=on, 2=all)"
615         depends on VERBOSE_MCHECK
616         default 1
617         help
618           This option allows the default printing mode to be set, and then
619           possibly overridden by a boot command argument.
620 
621           For example, if one wanted the option of printing verbose
622           machine checks, but wanted the default to be as if verbose
623           machine check printing was turned off, then one would choose
624           the printing mode to be 0. Then, upon reboot, one could add
625           the boot command line "verbose_mcheck=1" to get the normal
626           verbose machine check printing, or "verbose_mcheck=2" to get
627           the maximum information available.
628 
629           Take the default (1) unless you want more control or more info.
630 
631 choice
632         prompt "Timer interrupt frequency (HZ)?"
633         default HZ_128 if ALPHA_QEMU
634         default HZ_1200 if ALPHA_RAWHIDE
635         default HZ_1024
636         help
637           The frequency at which timer interrupts occur.  A high frequency
638           minimizes latency, whereas a low frequency minimizes overhead of
639           process accounting.  The later effect is especially significant
640           when being run under QEMU.
641 
642           Note that some Alpha hardware cannot change the interrupt frequency
643           of the timer.  If unsure, say 1024 (or 1200 for Rawhide).
644 
645         config HZ_32
646                 bool "32 Hz"
647         config HZ_64
648                 bool "64 Hz"
649         config HZ_128
650                 bool "128 Hz"
651         config HZ_256
652                 bool "256 Hz"
653         config HZ_1024
654                 bool "1024 Hz"
655         config HZ_1200
656                 bool "1200 Hz"
657 endchoice
658 
659 config HZ
660         int
661         default 32 if HZ_32
662         default 64 if HZ_64
663         default 128 if HZ_128
664         default 256 if HZ_256
665         default 1200 if HZ_1200
666         default 1024
667 
668 config SRM_ENV
669         tristate "SRM environment through procfs"
670         depends on PROC_FS
671         help
672           If you enable this option, a subdirectory inside /proc called
673           /proc/srm_environment will give you access to the all important
674           SRM environment variables (those which have a name) and also
675           to all others (by their internal number).
676 
677           SRM is something like a BIOS for Alpha machines. There are some
678           other such BIOSes, like AlphaBIOS, which this driver cannot
679           support (hey, that's not SRM!).
680 
681           Despite the fact that this driver doesn't work on all Alphas (but
682           only on those which have SRM as their firmware), it's save to
683           build it even if your particular machine doesn't know about SRM
684           (or if you intend to compile a generic kernel). It will simply
685           not create those subdirectory in /proc (and give you some warning,
686           of course).
687 
688           This driver is also available as a module and will be called
689           srm_env then.
690 
691 endmenu
692 
693 # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
694 # but we also need it if VGA_HOSE is set
695 config DUMMY_CONSOLE
696         bool
697         depends on VGA_HOSE
698         default y

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