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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 DMA_OPS if PCI
 11         select FORCE_PCI if !ALPHA_JENSEN
 12         select PCI_DOMAINS if PCI
 13         select PCI_SYSCALL if PCI
 14         select HAVE_AOUT
 15         select HAVE_ASM_MODVERSIONS
 16         select HAVE_IDE
 17         select HAVE_OPROFILE
 18         select HAVE_PCSPKR_PLATFORM
 19         select HAVE_PERF_EVENTS
 20         select NEED_DMA_MAP_STATE
 21         select NEED_SG_DMA_LENGTH
 22         select VIRT_TO_BUS
 23         select GENERIC_IRQ_PROBE
 24         select GENERIC_PCI_IOMAP if PCI
 25         select AUTO_IRQ_AFFINITY if SMP
 26         select GENERIC_IRQ_SHOW
 27         select ARCH_WANT_IPC_PARSE_VERSION
 28         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 29         select AUDIT_ARCH
 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         select SET_FS
 42         select SPARSEMEM_EXTREME if SPARSEMEM
 43         help
 44           The Alpha is a 64-bit general-purpose processor designed and
 45           marketed by the Digital Equipment Corporation of blessed memory,
 46           now Hewlett-Packard.  The Alpha Linux project has a home page at
 47           <http://www.alphalinux.org/>.
 48 
 49 config 64BIT
 50         def_bool y
 51 
 52 config MMU
 53         bool
 54         default y
 55 
 56 config ARCH_HAS_ILOG2_U32
 57         bool
 58         default n
 59 
 60 config ARCH_HAS_ILOG2_U64
 61         bool
 62         default n
 63 
 64 config GENERIC_CALIBRATE_DELAY
 65         bool
 66         default y
 67 
 68 config ZONE_DMA
 69         bool
 70         default y
 71 
 72 config GENERIC_ISA_DMA
 73         bool
 74         default y
 75 
 76 config PGTABLE_LEVELS
 77         int
 78         default 3
 79 
 80 config AUDIT_ARCH
 81         bool
 82 
 83 menu "System setup"
 84 
 85 choice
 86         prompt "Alpha system type"
 87         default ALPHA_GENERIC
 88         help
 89           This is the system type of your hardware.  A "generic" kernel will
 90           run on any supported Alpha system. However, if you configure a
 91           kernel for your specific system, it will be faster and smaller.
 92 
 93           To find out what type of Alpha system you have, you may want to
 94           check out the Linux/Alpha FAQ, accessible on the WWW from
 95           <http://www.alphalinux.org/>. In summary:
 96 
 97           Alcor/Alpha-XLT     AS 600, AS 500, XL-300, XL-366
 98           Alpha-XL            XL-233, XL-266
 99           AlphaBook1          Alpha laptop
100           Avanti              AS 200, AS 205, AS 250, AS 255, AS 300, AS 400
101           Cabriolet           AlphaPC64, AlphaPCI64
102           DP264               DP264 / DS20 / ES40 / DS10 / DS10L
103           EB164               EB164 21164 evaluation board
104           EB64+               EB64+ 21064 evaluation board
105           EB66                EB66 21066 evaluation board
106           EB66+               EB66+ 21066 evaluation board
107           Jensen              DECpc 150, DEC 2000 models 300, 500
108           LX164               AlphaPC164-LX
109           Lynx                AS 2100A
110           Miata               Personal Workstation 433/500/600 a/au
111           Marvel              AlphaServer ES47 / ES80 / GS1280
112           Mikasa              AS 1000
113           Noname              AXPpci33, UDB (Multia)
114           Noritake            AS 1000A, AS 600A, AS 800
115           PC164               AlphaPC164
116           Rawhide             AS 1200, AS 4000, AS 4100
117           Ruffian             RPX164-2, AlphaPC164-UX, AlphaPC164-BX
118           SX164               AlphaPC164-SX
119           Sable               AS 2000, AS 2100
120           Shark               DS 20L
121           Takara              Takara (OEM)
122           Titan               AlphaServer ES45 / DS25 / DS15
123           Wildfire            AlphaServer GS 40/80/160/320
124 
125           If you don't know what to do, choose "generic".
126 
127 config ALPHA_GENERIC
128         bool "Generic"
129         depends on TTY
130         select HAVE_EISA
131         help
132           A generic kernel will run on all supported Alpha hardware.
133 
134 config ALPHA_ALCOR
135         bool "Alcor/Alpha-XLT"
136         select HAVE_EISA
137         help
138           For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
139           slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
140           Address, CIA) - a 383 pin plastic PGA).  It provides a DRAM
141           controller (256-bit memory bus) and a PCI interface.  It also does
142           all the work required to support an external Bcache and to maintain
143           memory coherence when a PCI device DMAs into (or out of) memory.
144 
145 config ALPHA_XL
146         bool "Alpha-XL"
147         help
148           XL-233 and XL-266-based Alpha systems.
149 
150 config ALPHA_BOOK1
151         bool "AlphaBook1"
152         help
153           Dec AlphaBook1/Burns Alpha-based laptops.
154 
155 config ALPHA_AVANTI_CH
156         bool "Avanti"
157 
158 config ALPHA_CABRIOLET
159         bool "Cabriolet"
160         help
161           Cabriolet AlphaPC64, AlphaPCI64 systems.  Derived from EB64+ but now
162           baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA
163           slots, 4 PCI slots (one pair are on a shared slot), uses plug-in
164           Bcache SIMMs.  Requires power supply with 3.3V output.
165 
166 config ALPHA_DP264
167         bool "DP264"
168         help
169           Various 21264 systems with the tsunami core logic chipset.
170           API Networks: 264DP, UP2000(+), CS20;
171           Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40.
172 
173 config ALPHA_EB164
174         bool "EB164"
175         help
176           EB164 21164 evaluation board from DEC.  Uses 21164 and ALCOR.  Has
177           ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is
178           shared with an ISA slot) and 2 32-bit PCI slots.  Uses plus-in
179           Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD,
180           MOUSE (PS2 style), RTC/NVRAM.  Boot ROM is Flash.  PC-AT-sized
181           motherboard.  Requires power supply with 3.3V output.
182 
183 config ALPHA_EB64P_CH
184         bool "EB64+"
185 
186 config ALPHA_EB66
187         bool "EB66"
188         help
189           A Digital DS group board.  Uses 21066 or 21066A.  I/O sub-system is
190           identical to EB64+.  Baby PC-AT size.  Runs from standard PC power
191           supply.  The EB66 schematic was published as a marketing poster
192           advertising the 21066 as "the first microprocessor in the world with
193           embedded PCI".
194 
195 config ALPHA_EB66P
196         bool "EB66+"
197         help
198           Later variant of the EB66 board.
199 
200 config ALPHA_EIGER
201         bool "Eiger"
202         help
203           Apparently an obscure OEM single-board computer based on the
204           Typhoon/Tsunami chipset family. Information on it is scanty.
205 
206 config ALPHA_JENSEN
207         bool "Jensen"
208         depends on BROKEN
209         select HAVE_EISA
210         help
211           DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
212           of the first-generation Alpha systems. A number of these systems
213           seem to be available on the second- hand market. The Jensen is a
214           floor-standing tower system which originally used a 150MHz 21064 It
215           used programmable logic to interface a 486 EISA I/O bridge to the
216           CPU.
217 
218 config ALPHA_LX164
219         bool "LX164"
220         help
221           A technical overview of this board is available at
222           <http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>.
223 
224 config ALPHA_LYNX
225         bool "Lynx"
226         select HAVE_EISA
227         help
228           AlphaServer 2100A-based systems.
229 
230 config ALPHA_MARVEL
231         bool "Marvel"
232         help
233           AlphaServer ES47 / ES80 / GS1280 based on EV7.
234 
235 config ALPHA_MIATA
236         bool "Miata"
237         select HAVE_EISA
238         help
239           The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a,
240           or 600au).
241 
242 config ALPHA_MIKASA
243         bool "Mikasa"
244         help
245           AlphaServer 1000-based Alpha systems.
246 
247 config ALPHA_NAUTILUS
248         bool "Nautilus"
249         help
250           Alpha systems based on the AMD 751 & ALI 1543C chipsets.
251 
252 config ALPHA_NONAME_CH
253         bool "Noname"
254 
255 config ALPHA_NORITAKE
256         bool "Noritake"
257         select HAVE_EISA
258         help
259           AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based
260           systems.
261 
262 config ALPHA_PC164
263         bool "PC164"
264 
265 config ALPHA_P2K
266         bool "Platform2000"
267 
268 config ALPHA_RAWHIDE
269         bool "Rawhide"
270         select HAVE_EISA
271         help
272           AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines.
273           See HOWTO at
274           <http://www.alphalinux.org/docs/rawhide/4100_install.shtml>.
275 
276 config ALPHA_RUFFIAN
277         bool "Ruffian"
278         help
279           Samsung APC164UX.  There is a page on known problems and workarounds
280           at <http://www.alphalinux.org/faq/FAQ-11.html>.
281 
282 config ALPHA_RX164
283         bool "RX164"
284 
285 config ALPHA_SX164
286         bool "SX164"
287 
288 config ALPHA_SABLE
289         bool "Sable"
290         select HAVE_EISA
291         help
292           Digital AlphaServer 2000 and 2100-based systems.
293 
294 config ALPHA_SHARK
295         bool "Shark"
296 
297 config ALPHA_TAKARA
298         bool "Takara"
299         help
300           Alpha 11164-based OEM single-board computer.
301 
302 config ALPHA_TITAN
303         bool "Titan"
304         help
305           AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset.
306 
307 config ALPHA_WILDFIRE
308         bool "Wildfire"
309         help
310           AlphaServer GS 40/80/160/320 SMP based on the EV67 core.
311 
312 endchoice
313 
314 # clear all implied options (don't want default values for those):
315 # Most of these machines have ISA slots; not exactly sure which don't,
316 # and this doesn't activate hordes of code, so do it always.
317 config ISA
318         bool
319         default y
320         help
321           Find out whether you have ISA slots on your motherboard.  ISA is the
322           name of a bus system, i.e. the way the CPU talks to the other stuff
323           inside your box.  Other bus systems are PCI, EISA, MicroChannel
324           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
325           newer boards don't support it.  If you have ISA, say Y, otherwise N.
326 
327 config ISA_DMA_API
328         bool
329         default y
330 
331 config ALPHA_NONAME
332         bool
333         depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
334         default y
335         help
336           The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia
337           UDB).  This design was produced by Digital's Technical OEM (TOEM)
338           group. It uses the 21066 processor running at 166MHz or 233MHz. It
339           is a baby-AT size, and runs from a standard PC power supply. It has
340           5 ISA slots and 3 PCI slots (one pair are a shared slot). There are
341           2 versions, with either PS/2 or large DIN connectors for the
342           keyboard.
343 
344 config ALPHA_EV4
345         bool
346         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
347         default y if !ALPHA_LYNX
348 
349 config ALPHA_LCA
350         bool
351         depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
352         default y
353 
354 config ALPHA_APECS
355         bool
356         depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL
357         default y
358 
359 config ALPHA_EB64P
360         bool
361         depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH
362         default y
363         help
364           Uses 21064 or 21064A and APECs.  Has ISA and PCI expansion (3 ISA,
365           2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs.
366           ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI
367           (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style),
368           SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM.  PC-AT size.
369           Runs from standard PC power supply.
370 
371 config ALPHA_EV5
372         bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX
373         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
374 
375 config ALPHA_EV4
376         bool
377         default y if ALPHA_LYNX && !ALPHA_EV5
378 
379 config ALPHA_CIA
380         bool
381         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
382         default y
383 
384 config ALPHA_EV56
385         bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR
386         default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA
387 
388 config ALPHA_EV56
389         prompt "EV56 CPU (speed >= 333MHz)?"
390         depends on ALPHA_NORITAKE || ALPHA_PRIMO
391 
392 config ALPHA_EV56
393         prompt "EV56 CPU (speed >= 400MHz)?"
394         depends on ALPHA_RAWHIDE
395 
396 config ALPHA_PRIMO
397         bool "EV5 CPU daughtercard (model 5/xxx)?"
398         depends on ALPHA_NORITAKE || ALPHA_MIKASA
399         help
400           Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx.
401 
402 config ALPHA_GAMMA
403         bool "EV5 CPU(s) (model 5/xxx)?"
404         depends on ALPHA_SABLE
405         help
406           Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx.
407 
408 config ALPHA_GAMMA
409         bool
410         depends on ALPHA_LYNX
411         default y
412 
413 config ALPHA_T2
414         bool
415         depends on ALPHA_SABLE || ALPHA_LYNX
416         default y
417 
418 config ALPHA_PYXIS
419         bool
420         depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
421         default y
422 
423 config ALPHA_EV6
424         bool
425         depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
426         default y
427 
428 config ALPHA_TSUNAMI
429         bool
430         depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
431         default y
432 
433 config ALPHA_EV67
434         bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
435         default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
436         help
437           Is this a machine based on the EV67 core?  If in doubt, select N here
438           and the machine will be treated as an EV6.
439 
440 config ALPHA_MCPCIA
441         bool
442         depends on ALPHA_RAWHIDE
443         default y
444 
445 config ALPHA_POLARIS
446         bool
447         depends on ALPHA_RX164
448         default y
449 
450 config ALPHA_IRONGATE
451         bool
452         depends on ALPHA_NAUTILUS
453         default y
454 
455 config GENERIC_HWEIGHT
456         bool
457         default y if !ALPHA_EV67
458 
459 config ALPHA_AVANTI
460         bool
461         depends on ALPHA_XL || ALPHA_AVANTI_CH
462         default y
463         help
464           Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based
465           Alphas. Info at
466           <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>.
467 
468 config ALPHA_BROKEN_IRQ_MASK
469         bool
470         depends on ALPHA_GENERIC || ALPHA_PC164
471         default y
472 
473 config VGA_HOSE
474         bool
475         depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI)
476         default y
477         help
478           Support VGA on an arbitrary hose; needed for several platforms
479           which always have multiple hoses, and whose consoles support it.
480 
481 
482 config ALPHA_QEMU
483         bool "Run under QEMU emulation"
484         depends on !ALPHA_GENERIC
485         help
486           Assume the presence of special features supported by QEMU PALcode
487           that reduce the overhead of system emulation.
488 
489           Generic kernels will auto-detect QEMU.  But when building a
490           system-specific kernel, the assumption is that we want to
491           eliminate as many runtime tests as possible.
492 
493           If unsure, say N.
494 
495 
496 config ALPHA_SRM
497         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
498         depends on TTY
499         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
500         help
501           There are two different types of booting firmware on Alphas: SRM,
502           which is command line driven, and ARC, which uses menus and arrow
503           keys. Details about the Linux/Alpha booting process are contained in
504           the Linux/Alpha FAQ, accessible on the WWW from
505           <http://www.alphalinux.org/>.
506 
507           The usual way to load Linux on an Alpha machine is to use MILO
508           (a bootloader that lets you pass command line parameters to the
509           kernel just like lilo does for the x86 architecture) which can be
510           loaded either from ARC or can be installed directly as a permanent
511           firmware replacement from floppy (which requires changing a certain
512           jumper on the motherboard). If you want to do either of these, say N
513           here. If MILO doesn't work on your system (true for Jensen
514           motherboards), you can bypass it altogether and boot Linux directly
515           from an SRM console; say Y here in order to do that. Note that you
516           won't be able to boot from an IDE disk using SRM.
517 
518           If unsure, say N.
519 
520 config ARCH_MAY_HAVE_PC_FDC
521         def_bool y
522 
523 config SMP
524         bool "Symmetric multi-processing support"
525         depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
526         help
527           This enables support for systems with more than one CPU. If you have
528           a system with only one CPU, say N. If you have a system with more
529           than one CPU, say Y.
530 
531           If you say N here, the kernel will run on uni- and multiprocessor
532           machines, but will use only one CPU of a multiprocessor machine. If
533           you say Y here, the kernel will run on many, but not all,
534           uniprocessor machines. On a uniprocessor machine, the kernel
535           will run faster if you say N here.
536 
537           See also the SMP-HOWTO available at
538           <http://www.tldp.org/docs.html#howto>.
539 
540           If you don't know what to do here, say N.
541 
542 config NR_CPUS
543         int "Maximum number of CPUs (2-32)"
544         range 2 32
545         depends on SMP
546         default "32" if ALPHA_GENERIC || ALPHA_MARVEL
547         default "4" if !ALPHA_GENERIC && !ALPHA_MARVEL
548         help
549           MARVEL support can handle a maximum of 32 CPUs, all the others
550           with working support have a maximum of 4 CPUs.
551 
552 config ARCH_DISCONTIGMEM_ENABLE
553         bool "Discontiguous Memory Support"
554         depends on BROKEN
555         help
556           Say Y to support efficient handling of discontiguous physical memory,
557           for architectures which are either NUMA (Non-Uniform Memory Access)
558           or have huge holes in the physical address space for other reasons.
559           See <file:Documentation/vm/numa.rst> for more.
560 
561 config ARCH_SPARSEMEM_ENABLE
562         bool "Sparse Memory Support"
563         help
564           Say Y to support efficient handling of discontiguous physical memory,
565           for systems that have huge holes in the physical address space.
566 
567 config NUMA
568         bool "NUMA Support (EXPERIMENTAL)"
569         depends on DISCONTIGMEM && BROKEN
570         help
571           Say Y to compile the kernel to support NUMA (Non-Uniform Memory
572           Access).  This option is for configuring high-end multiprocessor
573           server machines.  If in doubt, say N.
574 
575 config ALPHA_WTINT
576         bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
577         default y if ALPHA_QEMU
578         default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA)
579         default n if !ALPHA_SRM && !ALPHA_GENERIC
580         default y if SMP
581         help
582           The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
583           to sleep until the next interrupt.  This may reduce the power
584           consumed, and the heat produced by the computer.  However, it has
585           the side effect of making the cycle counter unreliable as a timing
586           device across the sleep.
587 
588           For emulation under QEMU, definitely say Y here, as we have other
589           mechanisms for measuring time than the cycle counter.
590 
591           For EV4 (but not LCA), EV5 and EV56 systems, or for systems running
592           MILO, sleep mode is not supported so you might as well say N here.
593 
594           For SMP systems we cannot use the cycle counter for timing anyway,
595           so you might as well say Y here.
596 
597           If unsure, say N.
598 
599 config NODES_SHIFT
600         int
601         default "7"
602         depends on NEED_MULTIPLE_NODES
603 
604 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
605 config ALPHA_LARGE_VMALLOC
606         bool
607         help
608           Process creation and other aspects of virtual memory management can
609           be streamlined if we restrict the kernel to one PGD for all vmalloc
610           allocations.  This equates to about 8GB.
611 
612           Under normal circumstances, this is so far and above what is needed
613           as to be laughable.  However, there are certain applications (such
614           as benchmark-grade in-kernel web serving) that can make use of as
615           much vmalloc space as is available.
616 
617           Say N unless you know you need gobs and gobs of vmalloc space.
618 
619 config VERBOSE_MCHECK
620         bool "Verbose Machine Checks"
621 
622 config VERBOSE_MCHECK_ON
623         int "Verbose Printing Mode (0=off, 1=on, 2=all)"
624         depends on VERBOSE_MCHECK
625         default 1
626         help
627           This option allows the default printing mode to be set, and then
628           possibly overridden by a boot command argument.
629 
630           For example, if one wanted the option of printing verbose
631           machine checks, but wanted the default to be as if verbose
632           machine check printing was turned off, then one would choose
633           the printing mode to be 0. Then, upon reboot, one could add
634           the boot command line "verbose_mcheck=1" to get the normal
635           verbose machine check printing, or "verbose_mcheck=2" to get
636           the maximum information available.
637 
638           Take the default (1) unless you want more control or more info.
639 
640 choice
641         prompt "Timer interrupt frequency (HZ)?"
642         default HZ_128 if ALPHA_QEMU
643         default HZ_1200 if ALPHA_RAWHIDE
644         default HZ_1024
645         help
646           The frequency at which timer interrupts occur.  A high frequency
647           minimizes latency, whereas a low frequency minimizes overhead of
648           process accounting.  The later effect is especially significant
649           when being run under QEMU.
650 
651           Note that some Alpha hardware cannot change the interrupt frequency
652           of the timer.  If unsure, say 1024 (or 1200 for Rawhide).
653 
654         config HZ_32
655                 bool "32 Hz"
656         config HZ_64
657                 bool "64 Hz"
658         config HZ_128
659                 bool "128 Hz"
660         config HZ_256
661                 bool "256 Hz"
662         config HZ_1024
663                 bool "1024 Hz"
664         config HZ_1200
665                 bool "1200 Hz"
666 endchoice
667 
668 config HZ
669         int
670         default 32 if HZ_32
671         default 64 if HZ_64
672         default 128 if HZ_128
673         default 256 if HZ_256
674         default 1200 if HZ_1200
675         default 1024
676 
677 config SRM_ENV
678         tristate "SRM environment through procfs"
679         depends on PROC_FS
680         help
681           If you enable this option, a subdirectory inside /proc called
682           /proc/srm_environment will give you access to the all important
683           SRM environment variables (those which have a name) and also
684           to all others (by their internal number).
685 
686           SRM is something like a BIOS for Alpha machines. There are some
687           other such BIOSes, like AlphaBIOS, which this driver cannot
688           support (hey, that's not SRM!).
689 
690           Despite the fact that this driver doesn't work on all Alphas (but
691           only on those which have SRM as their firmware), it's save to
692           build it even if your particular machine doesn't know about SRM
693           (or if you intend to compile a generic kernel). It will simply
694           not create those subdirectory in /proc (and give you some warning,
695           of course).
696 
697           This driver is also available as a module and will be called
698           srm_env then.
699 
700 endmenu
701 
702 # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
703 # but we also need it if VGA_HOSE is set
704 config DUMMY_CONSOLE
705         bool
706         depends on VGA_HOSE
707         default y

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