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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_CLOCKEVENTS
31 	select GENERIC_CPU_VULNERABILITIES
32 	select GENERIC_SMP_IDLE_THREAD
33 	select GENERIC_STRNCPY_FROM_USER
34 	select GENERIC_STRNLEN_USER
35 	select HAVE_ARCH_AUDITSYSCALL
36 	select HAVE_MOD_ARCH_SPECIFIC
37 	select MODULES_USE_ELF_RELA
38 	select ODD_RT_SIGACTION
39 	select OLD_SIGSUSPEND
40 	select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
41 	select MMU_GATHER_NO_RANGE
42 	select SET_FS
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 	help
555 	  Say Y to support efficient handling of discontiguous physical memory,
556 	  for architectures which are either NUMA (Non-Uniform Memory Access)
557 	  or have huge holes in the physical address space for other reasons.
558 	  See <file:Documentation/vm/numa.rst> for more.
559 
560 config NUMA
561 	bool "NUMA Support (EXPERIMENTAL)"
562 	depends on DISCONTIGMEM && BROKEN
563 	help
564 	  Say Y to compile the kernel to support NUMA (Non-Uniform Memory
565 	  Access).  This option is for configuring high-end multiprocessor
566 	  server machines.  If in doubt, say N.
567 
568 config ALPHA_WTINT
569 	bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
570 	default y if ALPHA_QEMU
571 	default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA)
572 	default n if !ALPHA_SRM && !ALPHA_GENERIC
573 	default y if SMP
574 	help
575 	  The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
576 	  to sleep until the next interrupt.  This may reduce the power
577 	  consumed, and the heat produced by the computer.  However, it has
578 	  the side effect of making the cycle counter unreliable as a timing
579 	  device across the sleep.
580 
581 	  For emulation under QEMU, definitely say Y here, as we have other
582 	  mechanisms for measuring time than the cycle counter.
583 
584 	  For EV4 (but not LCA), EV5 and EV56 systems, or for systems running
585 	  MILO, sleep mode is not supported so you might as well say N here.
586 
587 	  For SMP systems we cannot use the cycle counter for timing anyway,
588 	  so you might as well say Y here.
589 
590 	  If unsure, say N.
591 
592 config NODES_SHIFT
593 	int
594 	default "7"
595 	depends on NEED_MULTIPLE_NODES
596 
597 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
598 config ALPHA_LARGE_VMALLOC
599 	bool
600 	help
601 	  Process creation and other aspects of virtual memory management can
602 	  be streamlined if we restrict the kernel to one PGD for all vmalloc
603 	  allocations.  This equates to about 8GB.
604 
605 	  Under normal circumstances, this is so far and above what is needed
606 	  as to be laughable.  However, there are certain applications (such
607 	  as benchmark-grade in-kernel web serving) that can make use of as
608 	  much vmalloc space as is available.
609 
610 	  Say N unless you know you need gobs and gobs of vmalloc space.
611 
612 config VERBOSE_MCHECK
613 	bool "Verbose Machine Checks"
614 
615 config VERBOSE_MCHECK_ON
616 	int "Verbose Printing Mode (0=off, 1=on, 2=all)"
617 	depends on VERBOSE_MCHECK
618 	default 1
619 	help
620 	  This option allows the default printing mode to be set, and then
621 	  possibly overridden by a boot command argument.
622 
623 	  For example, if one wanted the option of printing verbose
624 	  machine checks, but wanted the default to be as if verbose
625 	  machine check printing was turned off, then one would choose
626 	  the printing mode to be 0. Then, upon reboot, one could add
627 	  the boot command line "verbose_mcheck=1" to get the normal
628 	  verbose machine check printing, or "verbose_mcheck=2" to get
629 	  the maximum information available.
630 
631 	  Take the default (1) unless you want more control or more info.
632 
633 choice
634 	prompt "Timer interrupt frequency (HZ)?"
635 	default HZ_128 if ALPHA_QEMU
636 	default HZ_1200 if ALPHA_RAWHIDE
637 	default HZ_1024
638 	help
639 	  The frequency at which timer interrupts occur.  A high frequency
640 	  minimizes latency, whereas a low frequency minimizes overhead of
641 	  process accounting.  The later effect is especially significant
642 	  when being run under QEMU.
643 
644 	  Note that some Alpha hardware cannot change the interrupt frequency
645 	  of the timer.  If unsure, say 1024 (or 1200 for Rawhide).
646 
647 	config HZ_32
648 		bool "32 Hz"
649 	config HZ_64
650 		bool "64 Hz"
651 	config HZ_128
652 		bool "128 Hz"
653 	config HZ_256
654 		bool "256 Hz"
655 	config HZ_1024
656 		bool "1024 Hz"
657 	config HZ_1200
658 		bool "1200 Hz"
659 endchoice
660 
661 config HZ
662 	int
663 	default 32 if HZ_32
664 	default 64 if HZ_64
665 	default 128 if HZ_128
666 	default 256 if HZ_256
667 	default 1200 if HZ_1200
668 	default 1024
669 
670 config SRM_ENV
671 	tristate "SRM environment through procfs"
672 	depends on PROC_FS
673 	help
674 	  If you enable this option, a subdirectory inside /proc called
675 	  /proc/srm_environment will give you access to the all important
676 	  SRM environment variables (those which have a name) and also
677 	  to all others (by their internal number).
678 
679 	  SRM is something like a BIOS for Alpha machines. There are some
680 	  other such BIOSes, like AlphaBIOS, which this driver cannot
681 	  support (hey, that's not SRM!).
682 
683 	  Despite the fact that this driver doesn't work on all Alphas (but
684 	  only on those which have SRM as their firmware), it's save to
685 	  build it even if your particular machine doesn't know about SRM
686 	  (or if you intend to compile a generic kernel). It will simply
687 	  not create those subdirectory in /proc (and give you some warning,
688 	  of course).
689 
690 	  This driver is also available as a module and will be called
691 	  srm_env then.
692 
693 endmenu
694 
695 # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
696 # but we also need it if VGA_HOSE is set
697 config DUMMY_CONSOLE
698 	bool
699 	depends on VGA_HOSE
700 	default y
701