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Linux/arch/m68k/Kconfig.cpu

  1 comment "Processor Type"
  2 
  3 choice
  4         prompt "CPU family support"
  5         default M68KCLASSIC if MMU
  6         default COLDFIRE if !MMU
  7         help
  8           The Freescale (was Motorola) M68K family of processors implements
  9           the full 68000 processor instruction set.
 10           The Freescale ColdFire family of processors is a modern derivative
 11           of the 68000 processor family. They are mainly targeted at embedded
 12           applications, and are all System-On-Chip (SOC) devices, as opposed
 13           to stand alone CPUs. They implement a subset of the original 68000
 14           processor instruction set.
 15           If you anticipate running this kernel on a computer with a classic
 16           MC68xxx processor, select M68KCLASSIC.
 17           If you anticipate running this kernel on a computer with a ColdFire
 18           processor, select COLDFIRE.
 19 
 20 config M68KCLASSIC
 21         bool "Classic M68K CPU family support"
 22 
 23 config COLDFIRE
 24         bool "Coldfire CPU family support"
 25         select ARCH_HAVE_CUSTOM_GPIO_H
 26         select CPU_HAS_NO_BITFIELDS
 27         select CPU_HAS_NO_MULDIV64
 28         select GENERIC_CSUM
 29         select GPIOLIB
 30         select HAVE_CLK
 31 
 32 endchoice
 33 
 34 if M68KCLASSIC
 35 
 36 config M68000
 37         bool "MC68000"
 38         depends on !MMU
 39         select CPU_HAS_NO_BITFIELDS
 40         select CPU_HAS_NO_MULDIV64
 41         select CPU_HAS_NO_UNALIGNED
 42         select GENERIC_CSUM
 43         select CPU_NO_EFFICIENT_FFS
 44         select HAVE_ARCH_HASH
 45         help
 46           The Freescale (was Motorola) 68000 CPU is the first generation of
 47           the well known M68K family of processors. The CPU core as well as
 48           being available as a stand alone CPU was also used in many
 49           System-On-Chip devices (eg 68328, 68302, etc). It does not contain
 50           a paging MMU.
 51 
 52 config MCPU32
 53         bool
 54         select CPU_HAS_NO_BITFIELDS
 55         select CPU_HAS_NO_UNALIGNED
 56         select CPU_NO_EFFICIENT_FFS
 57         help
 58           The Freescale (was then Motorola) CPU32 is a CPU core that is
 59           based on the 68020 processor. For the most part it is used in
 60           System-On-Chip parts, and does not contain a paging MMU.
 61 
 62 config M68020
 63         bool "68020 support"
 64         depends on MMU
 65         select CPU_HAS_ADDRESS_SPACES
 66         help
 67           If you anticipate running this kernel on a computer with a MC68020
 68           processor, say Y. Otherwise, say N. Note that the 68020 requires a
 69           68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
 70           Sun 3, which provides its own version.
 71 
 72 config M68030
 73         bool "68030 support"
 74         depends on MMU && !MMU_SUN3
 75         select CPU_HAS_ADDRESS_SPACES
 76         help
 77           If you anticipate running this kernel on a computer with a MC68030
 78           processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
 79           work, as it does not include an MMU (Memory Management Unit).
 80 
 81 config M68040
 82         bool "68040 support"
 83         depends on MMU && !MMU_SUN3
 84         select CPU_HAS_ADDRESS_SPACES
 85         help
 86           If you anticipate running this kernel on a computer with a MC68LC040
 87           or MC68040 processor, say Y. Otherwise, say N. Note that an
 88           MC68EC040 will not work, as it does not include an MMU (Memory
 89           Management Unit).
 90 
 91 config M68060
 92         bool "68060 support"
 93         depends on MMU && !MMU_SUN3
 94         select CPU_HAS_ADDRESS_SPACES
 95         help
 96           If you anticipate running this kernel on a computer with a MC68060
 97           processor, say Y. Otherwise, say N.
 98 
 99 config M68328
100         bool "MC68328"
101         depends on !MMU
102         select M68000
103         help
104           Motorola 68328 processor support.
105 
106 config M68EZ328
107         bool "MC68EZ328"
108         depends on !MMU
109         select M68000
110         help
111           Motorola 68EX328 processor support.
112 
113 config M68VZ328
114         bool "MC68VZ328"
115         depends on !MMU
116         select M68000
117         help
118           Motorola 68VZ328 processor support.
119 
120 endif # M68KCLASSIC
121 
122 if COLDFIRE
123 
124 choice
125         prompt "ColdFire SoC type"
126         default M520x
127         help
128           Select the type of ColdFire System-on-Chip (SoC) that you want
129           to build for.
130 
131 config M5206
132         bool "MCF5206"
133         depends on !MMU
134         select COLDFIRE_SW_A7
135         select HAVE_MBAR
136         select CPU_NO_EFFICIENT_FFS
137         help
138           Motorola ColdFire 5206 processor support.
139 
140 config M5206e
141         bool "MCF5206e"
142         depends on !MMU
143         select COLDFIRE_SW_A7
144         select HAVE_MBAR
145         select CPU_NO_EFFICIENT_FFS
146         help
147           Motorola ColdFire 5206e processor support.
148 
149 config M520x
150         bool "MCF520x"
151         depends on !MMU
152         select GENERIC_CLOCKEVENTS
153         select HAVE_CACHE_SPLIT
154         help
155            Freescale Coldfire 5207/5208 processor support.
156 
157 config M523x
158         bool "MCF523x"
159         depends on !MMU
160         select GENERIC_CLOCKEVENTS
161         select HAVE_CACHE_SPLIT
162         select HAVE_IPSBAR
163         help
164           Freescale Coldfire 5230/1/2/4/5 processor support
165 
166 config M5249
167         bool "MCF5249"
168         depends on !MMU
169         select COLDFIRE_SW_A7
170         select HAVE_MBAR
171         select CPU_NO_EFFICIENT_FFS
172         help
173           Motorola ColdFire 5249 processor support.
174 
175 config M525x
176         bool "MCF525x"
177         depends on !MMU
178         select COLDFIRE_SW_A7
179         select HAVE_MBAR
180         select CPU_NO_EFFICIENT_FFS
181         help
182           Freescale (Motorola) Coldfire 5251/5253 processor support.
183 
184 config M5271
185         bool "MCF5271"
186         depends on !MMU
187         select M527x
188         select HAVE_CACHE_SPLIT
189         select HAVE_IPSBAR
190         select GENERIC_CLOCKEVENTS
191         help
192           Freescale (Motorola) ColdFire 5270/5271 processor support.
193 
194 config M5272
195         bool "MCF5272"
196         depends on !MMU
197         select COLDFIRE_SW_A7
198         select HAVE_MBAR
199         select CPU_NO_EFFICIENT_FFS
200         help
201           Motorola ColdFire 5272 processor support.
202 
203 config M5275
204         bool "MCF5275"
205         depends on !MMU
206         select M527x
207         select HAVE_CACHE_SPLIT
208         select HAVE_IPSBAR
209         select GENERIC_CLOCKEVENTS
210         help
211           Freescale (Motorola) ColdFire 5274/5275 processor support.
212 
213 config M528x
214         bool "MCF528x"
215         depends on !MMU
216         select GENERIC_CLOCKEVENTS
217         select HAVE_CACHE_SPLIT
218         select HAVE_IPSBAR
219         help
220           Motorola ColdFire 5280/5282 processor support.
221 
222 config M5307
223         bool "MCF5307"
224         depends on !MMU
225         select COLDFIRE_SW_A7
226         select HAVE_CACHE_CB
227         select HAVE_MBAR
228         select CPU_NO_EFFICIENT_FFS
229         help
230           Motorola ColdFire 5307 processor support.
231 
232 config M532x
233         bool "MCF532x"
234         depends on !MMU
235         select M53xx
236         select HAVE_CACHE_CB
237         help
238           Freescale (Motorola) ColdFire 532x processor support.
239 
240 config M537x
241         bool "MCF537x"
242         depends on !MMU
243         select M53xx
244         select HAVE_CACHE_CB
245         help
246           Freescale ColdFire 537x processor support.
247 
248 config M5407
249         bool "MCF5407"
250         depends on !MMU
251         select COLDFIRE_SW_A7
252         select HAVE_CACHE_CB
253         select HAVE_MBAR
254         select CPU_NO_EFFICIENT_FFS
255         help
256           Motorola ColdFire 5407 processor support.
257 
258 config M547x
259         bool "MCF547x"
260         select M54xx
261         select MMU_COLDFIRE if MMU
262         select HAVE_CACHE_CB
263         select HAVE_MBAR
264         select CPU_NO_EFFICIENT_FFS
265         help
266           Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
267 
268 config M548x
269         bool "MCF548x"
270         select MMU_COLDFIRE if MMU
271         select M54xx
272         select HAVE_CACHE_CB
273         select HAVE_MBAR
274         select CPU_NO_EFFICIENT_FFS
275         help
276           Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
277 
278 config M5441x
279         bool "MCF5441x"
280         depends on !MMU
281         select GENERIC_CLOCKEVENTS
282         select HAVE_CACHE_CB
283         help
284           Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
285 
286 endchoice
287 
288 config M527x
289         bool
290 
291 config M53xx
292         bool
293 
294 config M54xx
295         bool
296 
297 endif # COLDFIRE
298 
299 
300 comment "Processor Specific Options"
301 
302 config M68KFPU_EMU
303         bool "Math emulation support"
304         depends on MMU
305         help
306           At some point in the future, this will cause floating-point math
307           instructions to be emulated by the kernel on machines that lack a
308           floating-point math coprocessor.  Thrill-seekers and chronically
309           sleep-deprived psychotic hacker types can say Y now, everyone else
310           should probably wait a while.
311 
312 config M68KFPU_EMU_EXTRAPREC
313         bool "Math emulation extra precision"
314         depends on M68KFPU_EMU
315         help
316           The fpu uses normally a few bit more during calculations for
317           correct rounding, the emulator can (often) do the same but this
318           extra calculation can cost quite some time, so you can disable
319           it here. The emulator will then "only" calculate with a 64 bit
320           mantissa and round slightly incorrect, what is more than enough
321           for normal usage.
322 
323 config M68KFPU_EMU_ONLY
324         bool "Math emulation only kernel"
325         depends on M68KFPU_EMU
326         help
327           This option prevents any floating-point instructions from being
328           compiled into the kernel, thereby the kernel doesn't save any
329           floating point context anymore during task switches, so this
330           kernel will only be usable on machines without a floating-point
331           math coprocessor. This makes the kernel a bit faster as no tests
332           needs to be executed whether a floating-point instruction in the
333           kernel should be executed or not.
334 
335 config ADVANCED
336         bool "Advanced configuration options"
337         depends on MMU
338         ---help---
339           This gives you access to some advanced options for the CPU. The
340           defaults should be fine for most users, but these options may make
341           it possible for you to improve performance somewhat if you know what
342           you are doing.
343 
344           Note that the answer to this question won't directly affect the
345           kernel: saying N will just cause the configurator to skip all
346           the questions about these options.
347 
348           Most users should say N to this question.
349 
350 config RMW_INSNS
351         bool "Use read-modify-write instructions"
352         depends on ADVANCED
353         ---help---
354           This allows to use certain instructions that work with indivisible
355           read-modify-write bus cycles. While this is faster than the
356           workaround of disabling interrupts, it can conflict with DMA
357           ( = direct memory access) on many Amiga systems, and it is also said
358           to destabilize other machines. It is very likely that this will
359           cause serious problems on any Amiga or Atari Medusa if set. The only
360           configuration where it should work are 68030-based Ataris, where it
361           apparently improves performance. But you've been warned! Unless you
362           really know what you are doing, say N. Try Y only if you're quite
363           adventurous.
364 
365 config SINGLE_MEMORY_CHUNK
366         bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
367         depends on MMU
368         default y if SUN3
369         select NEED_MULTIPLE_NODES
370         help
371           Ignore all but the first contiguous chunk of physical memory for VM
372           purposes.  This will save a few bytes kernel size and may speed up
373           some operations.  Say N if not sure.
374 
375 config ARCH_DISCONTIGMEM_ENABLE
376         def_bool MMU && !SINGLE_MEMORY_CHUNK
377 
378 config 060_WRITETHROUGH
379         bool "Use write-through caching for 68060 supervisor accesses"
380         depends on ADVANCED && M68060
381         ---help---
382           The 68060 generally uses copyback caching of recently accessed data.
383           Copyback caching means that memory writes will be held in an on-chip
384           cache and only written back to memory some time later.  Saying Y
385           here will force supervisor (kernel) accesses to use writethrough
386           caching.  Writethrough caching means that data is written to memory
387           straight away, so that cache and memory data always agree.
388           Writethrough caching is less efficient, but is needed for some
389           drivers on 68060 based systems where the 68060 bus snooping signal
390           is hardwired on.  The 53c710 SCSI driver is known to suffer from
391           this problem.
392 
393 config M68K_L2_CACHE
394         bool
395         depends on MAC
396         default y
397 
398 config NODES_SHIFT
399         int
400         default "3"
401         depends on !SINGLE_MEMORY_CHUNK
402 
403 config CPU_HAS_NO_BITFIELDS
404         bool
405 
406 config CPU_HAS_NO_MULDIV64
407         bool
408 
409 config CPU_HAS_NO_UNALIGNED
410         bool
411 
412 config CPU_HAS_ADDRESS_SPACES
413         bool
414 
415 config FPU
416         bool
417 
418 config COLDFIRE_SW_A7
419         bool
420 
421 config HAVE_CACHE_SPLIT
422         bool
423 
424 config HAVE_CACHE_CB
425         bool
426 
427 config HAVE_MBAR
428         bool
429 
430 config HAVE_IPSBAR
431         bool
432 
433 config CLOCK_FREQ
434         int "Set the core clock frequency"
435         default "25000000" if M5206
436         default "54000000" if M5206e
437         default "166666666" if M520x
438         default "140000000" if M5249
439         default "150000000" if M527x || M523x
440         default "90000000" if M5307
441         default "50000000" if M5407
442         default "266000000" if M54xx
443         default "66666666"
444         depends on COLDFIRE
445         help
446           Define the CPU clock frequency in use. This is the core clock
447           frequency, it may or may not be the same as the external clock
448           crystal fitted to your board. Some processors have an internal
449           PLL and can have their frequency programmed at run time, others
450           use internal dividers. In general the kernel won't setup a PLL
451           if it is fitted (there are some exceptions). This value will be
452           specific to the exact CPU that you are using.
453 
454 config OLDMASK
455         bool "Old mask 5307 (1H55J) silicon"
456         depends on M5307
457         help
458           Build support for the older revision ColdFire 5307 silicon.
459           Specifically this is the 1H55J mask revision.
460 
461 if HAVE_CACHE_SPLIT
462 choice
463         prompt "Split Cache Configuration"
464         default CACHE_I
465 
466 config CACHE_I
467         bool "Instruction"
468         help
469           Use all of the ColdFire CPU cache memory as an instruction cache.
470 
471 config CACHE_D
472         bool "Data"
473         help
474           Use all of the ColdFire CPU cache memory as a data cache.
475 
476 config CACHE_BOTH
477         bool "Both"
478         help
479           Split the ColdFire CPU cache, and use half as an instruction cache
480           and half as a data cache.
481 endchoice
482 endif
483 
484 if HAVE_CACHE_CB
485 choice
486         prompt "Data cache mode"
487         default CACHE_WRITETHRU
488 
489 config CACHE_WRITETHRU
490         bool "Write-through"
491         help
492           The ColdFire CPU cache is set into Write-through mode.
493 
494 config CACHE_COPYBACK
495         bool "Copy-back"
496         help
497           The ColdFire CPU cache is set into Copy-back mode.
498 endchoice
499 endif
500 

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