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1# SPDX-License-Identifier: GPL-2.0
2comment "Processor Type"
3
4choice
5 prompt "CPU family support"
6 default M68KCLASSIC if MMU
7 default COLDFIRE if !MMU
8 help
9 The Freescale (was Motorola) M68K family of processors implements
10 the full 68000 processor instruction set.
11 The Freescale ColdFire family of processors is a modern derivative
12 of the 68000 processor family. They are mainly targeted at embedded
13 applications, and are all System-On-Chip (SOC) devices, as opposed
14 to stand alone CPUs. They implement a subset of the original 68000
15 processor instruction set.
16 If you anticipate running this kernel on a computer with a classic
17 MC68xxx processor, select M68KCLASSIC.
18 If you anticipate running this kernel on a computer with a ColdFire
19 processor, select COLDFIRE.
20
21config M68KCLASSIC
22 bool "Classic M68K CPU family support"
23
24config COLDFIRE
25 bool "Coldfire CPU family support"
26 select ARCH_HAVE_CUSTOM_GPIO_H
27 select CPU_HAS_NO_BITFIELDS
28 select CPU_HAS_NO_MULDIV64
29 select GENERIC_CSUM
30 select GPIOLIB
31 select HAVE_CLK
32
33endchoice
34
35if M68KCLASSIC
36
37config M68000
38 bool "MC68000"
39 depends on !MMU
40 select CPU_HAS_NO_BITFIELDS
41 select CPU_HAS_NO_MULDIV64
42 select CPU_HAS_NO_UNALIGNED
43 select GENERIC_CSUM
44 select CPU_NO_EFFICIENT_FFS
45 select HAVE_ARCH_HASH
46 help
47 The Freescale (was Motorola) 68000 CPU is the first generation of
48 the well known M68K family of processors. The CPU core as well as
49 being available as a stand alone CPU was also used in many
50 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
51 a paging MMU.
52
53config MCPU32
54 bool
55 select CPU_HAS_NO_BITFIELDS
56 select CPU_HAS_NO_UNALIGNED
57 select CPU_NO_EFFICIENT_FFS
58 help
59 The Freescale (was then Motorola) CPU32 is a CPU core that is
60 based on the 68020 processor. For the most part it is used in
61 System-On-Chip parts, and does not contain a paging MMU.
62
63config M68020
64 bool "68020 support"
65 depends on MMU
66 select FPU
67 select CPU_HAS_ADDRESS_SPACES
68 help
69 If you anticipate running this kernel on a computer with a MC68020
70 processor, say Y. Otherwise, say N. Note that the 68020 requires a
71 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
72 Sun 3, which provides its own version.
73
74config M68030
75 bool "68030 support"
76 depends on MMU && !MMU_SUN3
77 select FPU
78 select CPU_HAS_ADDRESS_SPACES
79 help
80 If you anticipate running this kernel on a computer with a MC68030
81 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
82 work, as it does not include an MMU (Memory Management Unit).
83
84config M68040
85 bool "68040 support"
86 depends on MMU && !MMU_SUN3
87 select FPU
88 select CPU_HAS_ADDRESS_SPACES
89 help
90 If you anticipate running this kernel on a computer with a MC68LC040
91 or MC68040 processor, say Y. Otherwise, say N. Note that an
92 MC68EC040 will not work, as it does not include an MMU (Memory
93 Management Unit).
94
95config M68060
96 bool "68060 support"
97 depends on MMU && !MMU_SUN3
98 select FPU
99 select CPU_HAS_ADDRESS_SPACES
100 help
101 If you anticipate running this kernel on a computer with a MC68060
102 processor, say Y. Otherwise, say N.
103
104config M68328
105 bool "MC68328"
106 depends on !MMU
107 select M68000
108 help
109 Motorola 68328 processor support.
110
111config M68EZ328
112 bool "MC68EZ328"
113 depends on !MMU
114 select M68000
115 help
116 Motorola 68EX328 processor support.
117
118config M68VZ328
119 bool "MC68VZ328"
120 depends on !MMU
121 select M68000
122 help
123 Motorola 68VZ328 processor support.
124
125endif # M68KCLASSIC
126
127if COLDFIRE
128
129choice
130 prompt "ColdFire SoC type"
131 default M520x
132 help
133 Select the type of ColdFire System-on-Chip (SoC) that you want
134 to build for.
135
136config M5206
137 bool "MCF5206"
138 depends on !MMU
139 select COLDFIRE_SW_A7
140 select HAVE_MBAR
141 select CPU_NO_EFFICIENT_FFS
142 help
143 Motorola ColdFire 5206 processor support.
144
145config M5206e
146 bool "MCF5206e"
147 depends on !MMU
148 select COLDFIRE_SW_A7
149 select HAVE_MBAR
150 select CPU_NO_EFFICIENT_FFS
151 help
152 Motorola ColdFire 5206e processor support.
153
154config M520x
155 bool "MCF520x"
156 depends on !MMU
157 select GENERIC_CLOCKEVENTS
158 select HAVE_CACHE_SPLIT
159 help
160 Freescale Coldfire 5207/5208 processor support.
161
162config M523x
163 bool "MCF523x"
164 depends on !MMU
165 select GENERIC_CLOCKEVENTS
166 select HAVE_CACHE_SPLIT
167 select HAVE_IPSBAR
168 help
169 Freescale Coldfire 5230/1/2/4/5 processor support
170
171config M5249
172 bool "MCF5249"
173 depends on !MMU
174 select COLDFIRE_SW_A7
175 select HAVE_MBAR
176 select CPU_NO_EFFICIENT_FFS
177 help
178 Motorola ColdFire 5249 processor support.
179
180config M525x
181 bool "MCF525x"
182 depends on !MMU
183 select COLDFIRE_SW_A7
184 select HAVE_MBAR
185 select CPU_NO_EFFICIENT_FFS
186 help
187 Freescale (Motorola) Coldfire 5251/5253 processor support.
188
189config M5271
190 bool "MCF5271"
191 depends on !MMU
192 select M527x
193 select HAVE_CACHE_SPLIT
194 select HAVE_IPSBAR
195 select GENERIC_CLOCKEVENTS
196 help
197 Freescale (Motorola) ColdFire 5270/5271 processor support.
198
199config M5272
200 bool "MCF5272"
201 depends on !MMU
202 select COLDFIRE_SW_A7
203 select HAVE_MBAR
204 select CPU_NO_EFFICIENT_FFS
205 help
206 Motorola ColdFire 5272 processor support.
207
208config M5275
209 bool "MCF5275"
210 depends on !MMU
211 select M527x
212 select HAVE_CACHE_SPLIT
213 select HAVE_IPSBAR
214 select GENERIC_CLOCKEVENTS
215 help
216 Freescale (Motorola) ColdFire 5274/5275 processor support.
217
218config M528x
219 bool "MCF528x"
220 depends on !MMU
221 select GENERIC_CLOCKEVENTS
222 select HAVE_CACHE_SPLIT
223 select HAVE_IPSBAR
224 help
225 Motorola ColdFire 5280/5282 processor support.
226
227config M5307
228 bool "MCF5307"
229 depends on !MMU
230 select COLDFIRE_SW_A7
231 select HAVE_CACHE_CB
232 select HAVE_MBAR
233 select CPU_NO_EFFICIENT_FFS
234 help
235 Motorola ColdFire 5307 processor support.
236
237config M532x
238 bool "MCF532x"
239 depends on !MMU
240 select M53xx
241 select HAVE_CACHE_CB
242 help
243 Freescale (Motorola) ColdFire 532x processor support.
244
245config M537x
246 bool "MCF537x"
247 depends on !MMU
248 select M53xx
249 select HAVE_CACHE_CB
250 help
251 Freescale ColdFire 537x processor support.
252
253config M5407
254 bool "MCF5407"
255 depends on !MMU
256 select COLDFIRE_SW_A7
257 select HAVE_CACHE_CB
258 select HAVE_MBAR
259 select CPU_NO_EFFICIENT_FFS
260 help
261 Motorola ColdFire 5407 processor support.
262
263config M547x
264 bool "MCF547x"
265 select M54xx
266 select MMU_COLDFIRE if MMU
267 select FPU if MMU
268 select HAVE_CACHE_CB
269 select HAVE_MBAR
270 select CPU_NO_EFFICIENT_FFS
271 help
272 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
273
274config M548x
275 bool "MCF548x"
276 select MMU_COLDFIRE if MMU
277 select FPU if MMU
278 select M54xx
279 select HAVE_CACHE_CB
280 select HAVE_MBAR
281 select CPU_NO_EFFICIENT_FFS
282 help
283 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
284
285config M5441x
286 bool "MCF5441x"
287 select MMU_COLDFIRE if MMU
288 select GENERIC_CLOCKEVENTS
289 select HAVE_CACHE_CB
290 help
291 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
292
293endchoice
294
295config M527x
296 bool
297
298config M53xx
299 bool
300
301config M54xx
302 select HAVE_PCI
303 bool
304
305endif # COLDFIRE
306
307
308comment "Processor Specific Options"
309
310config M68KFPU_EMU
311 bool "Math emulation support"
312 depends on MMU
313 help
314 At some point in the future, this will cause floating-point math
315 instructions to be emulated by the kernel on machines that lack a
316 floating-point math coprocessor. Thrill-seekers and chronically
317 sleep-deprived psychotic hacker types can say Y now, everyone else
318 should probably wait a while.
319
320config M68KFPU_EMU_EXTRAPREC
321 bool "Math emulation extra precision"
322 depends on M68KFPU_EMU
323 help
324 The fpu uses normally a few bit more during calculations for
325 correct rounding, the emulator can (often) do the same but this
326 extra calculation can cost quite some time, so you can disable
327 it here. The emulator will then "only" calculate with a 64 bit
328 mantissa and round slightly incorrect, what is more than enough
329 for normal usage.
330
331config M68KFPU_EMU_ONLY
332 bool "Math emulation only kernel"
333 depends on M68KFPU_EMU
334 help
335 This option prevents any floating-point instructions from being
336 compiled into the kernel, thereby the kernel doesn't save any
337 floating point context anymore during task switches, so this
338 kernel will only be usable on machines without a floating-point
339 math coprocessor. This makes the kernel a bit faster as no tests
340 needs to be executed whether a floating-point instruction in the
341 kernel should be executed or not.
342
343config ADVANCED
344 bool "Advanced configuration options"
345 depends on MMU
346 ---help---
347 This gives you access to some advanced options for the CPU. The
348 defaults should be fine for most users, but these options may make
349 it possible for you to improve performance somewhat if you know what
350 you are doing.
351
352 Note that the answer to this question won't directly affect the
353 kernel: saying N will just cause the configurator to skip all
354 the questions about these options.
355
356 Most users should say N to this question.
357
358config RMW_INSNS
359 bool "Use read-modify-write instructions"
360 depends on ADVANCED
361 ---help---
362 This allows to use certain instructions that work with indivisible
363 read-modify-write bus cycles. While this is faster than the
364 workaround of disabling interrupts, it can conflict with DMA
365 ( = direct memory access) on many Amiga systems, and it is also said
366 to destabilize other machines. It is very likely that this will
367 cause serious problems on any Amiga or Atari Medusa if set. The only
368 configuration where it should work are 68030-based Ataris, where it
369 apparently improves performance. But you've been warned! Unless you
370 really know what you are doing, say N. Try Y only if you're quite
371 adventurous.
372
373config SINGLE_MEMORY_CHUNK
374 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
375 depends on MMU
376 default y if SUN3
377 select NEED_MULTIPLE_NODES
378 help
379 Ignore all but the first contiguous chunk of physical memory for VM
380 purposes. This will save a few bytes kernel size and may speed up
381 some operations. Say N if not sure.
382
383config ARCH_DISCONTIGMEM_ENABLE
384 def_bool MMU && !SINGLE_MEMORY_CHUNK
385
386config 060_WRITETHROUGH
387 bool "Use write-through caching for 68060 supervisor accesses"
388 depends on ADVANCED && M68060
389 ---help---
390 The 68060 generally uses copyback caching of recently accessed data.
391 Copyback caching means that memory writes will be held in an on-chip
392 cache and only written back to memory some time later. Saying Y
393 here will force supervisor (kernel) accesses to use writethrough
394 caching. Writethrough caching means that data is written to memory
395 straight away, so that cache and memory data always agree.
396 Writethrough caching is less efficient, but is needed for some
397 drivers on 68060 based systems where the 68060 bus snooping signal
398 is hardwired on. The 53c710 SCSI driver is known to suffer from
399 this problem.
400
401config M68K_L2_CACHE
402 bool
403 depends on MAC
404 default y
405
406config NODES_SHIFT
407 int
408 default "3"
409 depends on !SINGLE_MEMORY_CHUNK
410
411config CPU_HAS_NO_BITFIELDS
412 bool
413
414config CPU_HAS_NO_MULDIV64
415 bool
416
417config CPU_HAS_NO_UNALIGNED
418 bool
419
420config CPU_HAS_ADDRESS_SPACES
421 bool
422
423config FPU
424 bool
425
426config COLDFIRE_SW_A7
427 bool
428
429config HAVE_CACHE_SPLIT
430 bool
431
432config HAVE_CACHE_CB
433 bool
434
435config HAVE_MBAR
436 bool
437
438config HAVE_IPSBAR
439 bool
440
441config CLOCK_FREQ
442 int "Set the core clock frequency"
443 default "25000000" if M5206
444 default "54000000" if M5206e
445 default "166666666" if M520x
446 default "140000000" if M5249
447 default "150000000" if M527x || M523x
448 default "90000000" if M5307
449 default "50000000" if M5407
450 default "266000000" if M54xx
451 default "66666666"
452 depends on COLDFIRE
453 help
454 Define the CPU clock frequency in use. This is the core clock
455 frequency, it may or may not be the same as the external clock
456 crystal fitted to your board. Some processors have an internal
457 PLL and can have their frequency programmed at run time, others
458 use internal dividers. In general the kernel won't setup a PLL
459 if it is fitted (there are some exceptions). This value will be
460 specific to the exact CPU that you are using.
461
462config OLDMASK
463 bool "Old mask 5307 (1H55J) silicon"
464 depends on M5307
465 help
466 Build support for the older revision ColdFire 5307 silicon.
467 Specifically this is the 1H55J mask revision.
468
469if HAVE_CACHE_SPLIT
470choice
471 prompt "Split Cache Configuration"
472 default CACHE_I
473
474config CACHE_I
475 bool "Instruction"
476 help
477 Use all of the ColdFire CPU cache memory as an instruction cache.
478
479config CACHE_D
480 bool "Data"
481 help
482 Use all of the ColdFire CPU cache memory as a data cache.
483
484config CACHE_BOTH
485 bool "Both"
486 help
487 Split the ColdFire CPU cache, and use half as an instruction cache
488 and half as a data cache.
489endchoice
490endif
491
492if HAVE_CACHE_CB
493choice
494 prompt "Data cache mode"
495 default CACHE_WRITETHRU
496
497config CACHE_WRITETHRU
498 bool "Write-through"
499 help
500 The ColdFire CPU cache is set into Write-through mode.
501
502config CACHE_COPYBACK
503 bool "Copy-back"
504 help
505 The ColdFire CPU cache is set into Copy-back mode.
506endchoice
507endif
508
1# SPDX-License-Identifier: GPL-2.0
2comment "Processor Type"
3
4choice
5 prompt "CPU family support"
6 default M68KCLASSIC if MMU
7 default COLDFIRE if !MMU
8 help
9 The Freescale (was Motorola) M68K family of processors implements
10 the full 68000 processor instruction set.
11 The Freescale ColdFire family of processors is a modern derivative
12 of the 68000 processor family. They are mainly targeted at embedded
13 applications, and are all System-On-Chip (SOC) devices, as opposed
14 to stand alone CPUs. They implement a subset of the original 68000
15 processor instruction set.
16 If you anticipate running this kernel on a computer with a classic
17 MC68xxx processor, select M68KCLASSIC.
18 If you anticipate running this kernel on a computer with a ColdFire
19 processor, select COLDFIRE.
20
21config M68KCLASSIC
22 bool "Classic M68K CPU family support"
23 select HAVE_ARCH_PFN_VALID
24
25config COLDFIRE
26 bool "Coldfire CPU family support"
27 select ARCH_HAVE_CUSTOM_GPIO_H
28 select CPU_HAS_NO_BITFIELDS
29 select CPU_HAS_NO_CAS
30 select CPU_HAS_NO_MULDIV64
31 select GENERIC_CSUM
32 select GPIOLIB
33 select HAVE_LEGACY_CLK
34
35endchoice
36
37if M68KCLASSIC
38
39config M68000
40 def_bool y
41 depends on !MMU
42 select CPU_HAS_NO_BITFIELDS
43 select CPU_HAS_NO_CAS
44 select CPU_HAS_NO_MULDIV64
45 select CPU_HAS_NO_UNALIGNED
46 select GENERIC_CSUM
47 select CPU_NO_EFFICIENT_FFS
48 select HAVE_ARCH_HASH
49 select LEGACY_TIMER_TICK
50 help
51 The Freescale (was Motorola) 68000 CPU is the first generation of
52 the well known M68K family of processors. The CPU core as well as
53 being available as a stand alone CPU was also used in many
54 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
55 a paging MMU.
56
57config M68020
58 bool "68020 support"
59 depends on MMU
60 select FPU
61 select CPU_HAS_ADDRESS_SPACES
62 help
63 If you anticipate running this kernel on a computer with a MC68020
64 processor, say Y. Otherwise, say N. Note that the 68020 requires a
65 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
66 Sun 3, which provides its own version.
67
68config M68030
69 bool "68030 support"
70 depends on MMU && !MMU_SUN3
71 select FPU
72 select CPU_HAS_ADDRESS_SPACES
73 help
74 If you anticipate running this kernel on a computer with a MC68030
75 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
76 work, as it does not include an MMU (Memory Management Unit).
77
78config M68040
79 bool "68040 support"
80 depends on MMU && !MMU_SUN3
81 select FPU
82 select CPU_HAS_ADDRESS_SPACES
83 help
84 If you anticipate running this kernel on a computer with a MC68LC040
85 or MC68040 processor, say Y. Otherwise, say N. Note that an
86 MC68EC040 will not work, as it does not include an MMU (Memory
87 Management Unit).
88
89config M68060
90 bool "68060 support"
91 depends on MMU && !MMU_SUN3
92 select FPU
93 select CPU_HAS_ADDRESS_SPACES
94 help
95 If you anticipate running this kernel on a computer with a MC68060
96 processor, say Y. Otherwise, say N.
97
98config M68328
99 bool
100 depends on !MMU
101 select M68000
102 help
103 Motorola 68328 processor support.
104
105config M68EZ328
106 bool
107 depends on !MMU
108 select M68000
109 help
110 Motorola 68EX328 processor support.
111
112config M68VZ328
113 bool
114 depends on !MMU
115 select M68000
116 help
117 Motorola 68VZ328 processor support.
118
119endif # M68KCLASSIC
120
121if COLDFIRE
122
123choice
124 prompt "ColdFire SoC type"
125 default M520x
126 help
127 Select the type of ColdFire System-on-Chip (SoC) that you want
128 to build for.
129
130config M5206
131 bool "MCF5206"
132 depends on !MMU
133 select COLDFIRE_SW_A7
134 select COLDFIRE_TIMERS
135 select HAVE_MBAR
136 select CPU_NO_EFFICIENT_FFS
137 help
138 Motorola ColdFire 5206 processor support.
139
140config M5206e
141 bool "MCF5206e"
142 depends on !MMU
143 select COLDFIRE_SW_A7
144 select COLDFIRE_TIMERS
145 select HAVE_MBAR
146 select CPU_NO_EFFICIENT_FFS
147 help
148 Motorola ColdFire 5206e processor support.
149
150config M520x
151 bool "MCF520x"
152 depends on !MMU
153 select COLDFIRE_PIT_TIMER
154 select HAVE_CACHE_SPLIT
155 help
156 Freescale Coldfire 5207/5208 processor support.
157
158config M523x
159 bool "MCF523x"
160 depends on !MMU
161 select COLDFIRE_PIT_TIMER
162 select HAVE_CACHE_SPLIT
163 select HAVE_IPSBAR
164 help
165 Freescale Coldfire 5230/1/2/4/5 processor support
166
167config M5249
168 bool "MCF5249"
169 depends on !MMU
170 select COLDFIRE_SW_A7
171 select COLDFIRE_TIMERS
172 select HAVE_MBAR
173 select CPU_NO_EFFICIENT_FFS
174 help
175 Motorola ColdFire 5249 processor support.
176
177config M525x
178 bool "MCF525x"
179 depends on !MMU
180 select COLDFIRE_SW_A7
181 select COLDFIRE_TIMERS
182 select HAVE_MBAR
183 select CPU_NO_EFFICIENT_FFS
184 help
185 Freescale (Motorola) Coldfire 5251/5253 processor support.
186
187config M5271
188 bool "MCF5271"
189 depends on !MMU
190 select COLDFIRE_PIT_TIMER
191 select M527x
192 select HAVE_CACHE_SPLIT
193 select HAVE_IPSBAR
194 help
195 Freescale (Motorola) ColdFire 5270/5271 processor support.
196
197config M5272
198 bool "MCF5272"
199 depends on !MMU
200 select COLDFIRE_SW_A7
201 select COLDFIRE_TIMERS
202 select HAVE_MBAR
203 select CPU_NO_EFFICIENT_FFS
204 help
205 Motorola ColdFire 5272 processor support.
206
207config M5275
208 bool "MCF5275"
209 depends on !MMU
210 select COLDFIRE_PIT_TIMER
211 select M527x
212 select HAVE_CACHE_SPLIT
213 select HAVE_IPSBAR
214 help
215 Freescale (Motorola) ColdFire 5274/5275 processor support.
216
217config M528x
218 bool "MCF528x"
219 depends on !MMU
220 select COLDFIRE_PIT_TIMER
221 select HAVE_CACHE_SPLIT
222 select HAVE_IPSBAR
223 help
224 Motorola ColdFire 5280/5282 processor support.
225
226config M5307
227 bool "MCF5307"
228 depends on !MMU
229 select COLDFIRE_TIMERS
230 select COLDFIRE_SW_A7
231 select HAVE_CACHE_CB
232 select HAVE_MBAR
233 select CPU_NO_EFFICIENT_FFS
234 help
235 Motorola ColdFire 5307 processor support.
236
237config M532x
238 bool "MCF532x"
239 depends on !MMU
240 select COLDFIRE_TIMERS
241 select M53xx
242 select HAVE_CACHE_CB
243 help
244 Freescale (Motorola) ColdFire 532x processor support.
245
246config M537x
247 bool "MCF537x"
248 depends on !MMU
249 select COLDFIRE_TIMERS
250 select M53xx
251 select HAVE_CACHE_CB
252 help
253 Freescale ColdFire 537x processor support.
254
255config M5407
256 bool "MCF5407"
257 depends on !MMU
258 select COLDFIRE_SW_A7
259 select COLDFIRE_TIMERS
260 select HAVE_CACHE_CB
261 select HAVE_MBAR
262 select CPU_NO_EFFICIENT_FFS
263 help
264 Motorola ColdFire 5407 processor support.
265
266config M547x
267 bool "MCF547x"
268 select M54xx
269 select COLDFIRE_SLTIMERS
270 select MMU_COLDFIRE if MMU
271 select FPU if MMU
272 select HAVE_CACHE_CB
273 select HAVE_MBAR
274 select CPU_NO_EFFICIENT_FFS
275 help
276 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
277
278config M548x
279 bool "MCF548x"
280 select COLDFIRE_SLTIMERS
281 select MMU_COLDFIRE if MMU
282 select FPU if MMU
283 select M54xx
284 select HAVE_CACHE_CB
285 select HAVE_MBAR
286 select CPU_NO_EFFICIENT_FFS
287 help
288 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
289
290config M5441x
291 bool "MCF5441x"
292 select COLDFIRE_PIT_TIMER
293 select MMU_COLDFIRE if MMU
294 select HAVE_CACHE_CB
295 help
296 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
297
298endchoice
299
300config M527x
301 bool
302
303config M53xx
304 bool
305
306config M54xx
307 select HAVE_PCI
308 bool
309
310config COLDFIRE_PIT_TIMER
311 bool
312
313config COLDFIRE_TIMERS
314 bool
315 select LEGACY_TIMER_TICK
316
317config COLDFIRE_SLTIMERS
318 bool
319 select LEGACY_TIMER_TICK
320
321endif # COLDFIRE
322
323comment "Processor Specific Options"
324
325config M68KFPU_EMU
326 bool "Math emulation support"
327 depends on M68KCLASSIC && FPU
328 help
329 At some point in the future, this will cause floating-point math
330 instructions to be emulated by the kernel on machines that lack a
331 floating-point math coprocessor. Thrill-seekers and chronically
332 sleep-deprived psychotic hacker types can say Y now, everyone else
333 should probably wait a while.
334
335config M68KFPU_EMU_EXTRAPREC
336 bool "Math emulation extra precision"
337 depends on M68KFPU_EMU
338 help
339 The fpu uses normally a few bit more during calculations for
340 correct rounding, the emulator can (often) do the same but this
341 extra calculation can cost quite some time, so you can disable
342 it here. The emulator will then "only" calculate with a 64 bit
343 mantissa and round slightly incorrect, what is more than enough
344 for normal usage.
345
346config M68KFPU_EMU_ONLY
347 bool "Math emulation only kernel"
348 depends on M68KFPU_EMU
349 help
350 This option prevents any floating-point instructions from being
351 compiled into the kernel, thereby the kernel doesn't save any
352 floating point context anymore during task switches, so this
353 kernel will only be usable on machines without a floating-point
354 math coprocessor. This makes the kernel a bit faster as no tests
355 needs to be executed whether a floating-point instruction in the
356 kernel should be executed or not.
357
358config ADVANCED
359 bool "Advanced configuration options"
360 depends on MMU
361 help
362 This gives you access to some advanced options for the CPU. The
363 defaults should be fine for most users, but these options may make
364 it possible for you to improve performance somewhat if you know what
365 you are doing.
366
367 Note that the answer to this question won't directly affect the
368 kernel: saying N will just cause the configurator to skip all
369 the questions about these options.
370
371 Most users should say N to this question.
372
373config RMW_INSNS
374 bool "Use read-modify-write instructions"
375 depends on ADVANCED && !CPU_HAS_NO_CAS
376 help
377 This allows to use certain instructions that work with indivisible
378 read-modify-write bus cycles. While this is faster than the
379 workaround of disabling interrupts, it can conflict with DMA
380 ( = direct memory access) on many Amiga systems, and it is also said
381 to destabilize other machines. It is very likely that this will
382 cause serious problems on any Amiga or Atari Medusa if set. The only
383 configuration where it should work are 68030-based Ataris, where it
384 apparently improves performance. But you've been warned! Unless you
385 really know what you are doing, say N. Try Y only if you're quite
386 adventurous.
387
388config SINGLE_MEMORY_CHUNK
389 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
390 depends on MMU
391 default y if SUN3 || MMU_COLDFIRE
392 help
393 Ignore all but the first contiguous chunk of physical memory for VM
394 purposes. This will save a few bytes kernel size and may speed up
395 some operations.
396 When this option os set to N, you may want to lower "Maximum zone
397 order" to save memory that could be wasted for unused memory map.
398 Say N if not sure.
399
400config ARCH_FORCE_MAX_ORDER
401 int "Maximum zone order" if ADVANCED
402 depends on !SINGLE_MEMORY_CHUNK
403 default "11"
404 help
405 The kernel memory allocator divides physically contiguous memory
406 blocks into "zones", where each zone is a power of two number of
407 pages. This option selects the largest power of two that the kernel
408 keeps in the memory allocator. If you need to allocate very large
409 blocks of physically contiguous memory, then you may need to
410 increase this value.
411
412 For systems that have holes in their physical address space this
413 value also defines the minimal size of the hole that allows
414 freeing unused memory map.
415
416 This config option is actually maximum order plus one. For example,
417 a value of 11 means that the largest free memory block is 2^10 pages.
418
419config 060_WRITETHROUGH
420 bool "Use write-through caching for 68060 supervisor accesses"
421 depends on ADVANCED && M68060
422 help
423 The 68060 generally uses copyback caching of recently accessed data.
424 Copyback caching means that memory writes will be held in an on-chip
425 cache and only written back to memory some time later. Saying Y
426 here will force supervisor (kernel) accesses to use writethrough
427 caching. Writethrough caching means that data is written to memory
428 straight away, so that cache and memory data always agree.
429 Writethrough caching is less efficient, but is needed for some
430 drivers on 68060 based systems where the 68060 bus snooping signal
431 is hardwired on. The 53c710 SCSI driver is known to suffer from
432 this problem.
433
434config M68K_L2_CACHE
435 bool
436 depends on MAC
437 default y
438
439config CPU_HAS_NO_BITFIELDS
440 bool
441
442config CPU_HAS_NO_CAS
443 bool
444
445config CPU_HAS_NO_MULDIV64
446 bool
447
448config CPU_HAS_NO_UNALIGNED
449 bool
450
451config CPU_HAS_ADDRESS_SPACES
452 bool
453 select ALTERNATE_USER_ADDRESS_SPACE
454
455config FPU
456 bool
457
458config COLDFIRE_SW_A7
459 bool
460
461config HAVE_CACHE_SPLIT
462 bool
463
464config HAVE_CACHE_CB
465 bool
466
467config HAVE_MBAR
468 bool
469
470config HAVE_IPSBAR
471 bool
472
473config CLOCK_FREQ
474 int "Set the core clock frequency"
475 default "25000000" if M5206
476 default "54000000" if M5206e
477 default "166666666" if M520x
478 default "140000000" if M5249
479 default "150000000" if M527x || M523x
480 default "90000000" if M5307
481 default "50000000" if M5407
482 default "266000000" if M54xx
483 default "66666666"
484 depends on COLDFIRE
485 help
486 Define the CPU clock frequency in use. This is the core clock
487 frequency, it may or may not be the same as the external clock
488 crystal fitted to your board. Some processors have an internal
489 PLL and can have their frequency programmed at run time, others
490 use internal dividers. In general the kernel won't setup a PLL
491 if it is fitted (there are some exceptions). This value will be
492 specific to the exact CPU that you are using.
493
494config OLDMASK
495 bool "Old mask 5307 (1H55J) silicon"
496 depends on M5307
497 help
498 Build support for the older revision ColdFire 5307 silicon.
499 Specifically this is the 1H55J mask revision.
500
501if HAVE_CACHE_SPLIT
502choice
503 prompt "Split Cache Configuration"
504 default CACHE_I
505
506config CACHE_I
507 bool "Instruction"
508 help
509 Use all of the ColdFire CPU cache memory as an instruction cache.
510
511config CACHE_D
512 bool "Data"
513 help
514 Use all of the ColdFire CPU cache memory as a data cache.
515
516config CACHE_BOTH
517 bool "Both"
518 help
519 Split the ColdFire CPU cache, and use half as an instruction cache
520 and half as a data cache.
521endchoice
522endif # HAVE_CACHE_SPLIT
523
524if HAVE_CACHE_CB
525choice
526 prompt "Data cache mode"
527 default CACHE_WRITETHRU
528
529config CACHE_WRITETHRU
530 bool "Write-through"
531 help
532 The ColdFire CPU cache is set into Write-through mode.
533
534config CACHE_COPYBACK
535 bool "Copy-back"
536 help
537 The ColdFire CPU cache is set into Copy-back mode.
538endchoice
539endif # HAVE_CACHE_CB