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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
1comment "Processor Type"
2
3choice
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
20config M68KCLASSIC
21 bool "Classic M68K CPU family support"
22
23config COLDFIRE
24 bool "Coldfire CPU family support"
25 select GENERIC_GPIO
26 select ARCH_REQUIRE_GPIOLIB
27 select ARCH_HAVE_CUSTOM_GPIO_H
28 select CPU_HAS_NO_BITFIELDS
29 select CPU_HAS_NO_MULDIV64
30 select GENERIC_CSUM
31
32endchoice
33
34if M68KCLASSIC
35
36config M68000
37 bool
38 select CPU_HAS_NO_BITFIELDS
39 select CPU_HAS_NO_MULDIV64
40 select GENERIC_CSUM
41 help
42 The Freescale (was Motorola) 68000 CPU is the first generation of
43 the well known M68K family of processors. The CPU core as well as
44 being available as a stand alone CPU was also used in many
45 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
46 a paging MMU.
47
48config MCPU32
49 bool
50 select CPU_HAS_NO_BITFIELDS
51 help
52 The Freescale (was then Motorola) CPU32 is a CPU core that is
53 based on the 68020 processor. For the most part it is used in
54 System-On-Chip parts, and does not contain a paging MMU.
55
56config M68020
57 bool "68020 support"
58 depends on MMU
59 select GENERIC_ATOMIC64
60 select CPU_HAS_ADDRESS_SPACES
61 help
62 If you anticipate running this kernel on a computer with a MC68020
63 processor, say Y. Otherwise, say N. Note that the 68020 requires a
64 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
65 Sun 3, which provides its own version.
66
67config M68030
68 bool "68030 support"
69 depends on MMU && !MMU_SUN3
70 select GENERIC_ATOMIC64
71 select CPU_HAS_ADDRESS_SPACES
72 help
73 If you anticipate running this kernel on a computer with a MC68030
74 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
75 work, as it does not include an MMU (Memory Management Unit).
76
77config M68040
78 bool "68040 support"
79 depends on MMU && !MMU_SUN3
80 select GENERIC_ATOMIC64
81 select CPU_HAS_ADDRESS_SPACES
82 help
83 If you anticipate running this kernel on a computer with a MC68LC040
84 or MC68040 processor, say Y. Otherwise, say N. Note that an
85 MC68EC040 will not work, as it does not include an MMU (Memory
86 Management Unit).
87
88config M68060
89 bool "68060 support"
90 depends on MMU && !MMU_SUN3
91 select GENERIC_ATOMIC64
92 select CPU_HAS_ADDRESS_SPACES
93 help
94 If you anticipate running this kernel on a computer with a MC68060
95 processor, say Y. Otherwise, say N.
96
97config M68328
98 bool "MC68328"
99 depends on !MMU
100 select M68000
101 help
102 Motorola 68328 processor support.
103
104config M68EZ328
105 bool "MC68EZ328"
106 depends on !MMU
107 select M68000
108 help
109 Motorola 68EX328 processor support.
110
111config M68VZ328
112 bool "MC68VZ328"
113 depends on !MMU
114 select M68000
115 help
116 Motorola 68VZ328 processor support.
117
118config M68360
119 bool "MC68360"
120 depends on !MMU
121 select MCPU32
122 help
123 Motorola 68360 processor support.
124
125endif # M68KCLASSIC
126
127if COLDFIRE
128
129config M5206
130 bool "MCF5206"
131 depends on !MMU
132 select COLDFIRE_SW_A7
133 select HAVE_MBAR
134 help
135 Motorola ColdFire 5206 processor support.
136
137config M5206e
138 bool "MCF5206e"
139 depends on !MMU
140 select COLDFIRE_SW_A7
141 select HAVE_MBAR
142 help
143 Motorola ColdFire 5206e processor support.
144
145config M520x
146 bool "MCF520x"
147 depends on !MMU
148 select GENERIC_CLOCKEVENTS
149 select HAVE_CACHE_SPLIT
150 help
151 Freescale Coldfire 5207/5208 processor support.
152
153config M523x
154 bool "MCF523x"
155 depends on !MMU
156 select GENERIC_CLOCKEVENTS
157 select HAVE_CACHE_SPLIT
158 select HAVE_IPSBAR
159 help
160 Freescale Coldfire 5230/1/2/4/5 processor support
161
162config M5249
163 bool "MCF5249"
164 depends on !MMU
165 select COLDFIRE_SW_A7
166 select HAVE_MBAR
167 help
168 Motorola ColdFire 5249 processor support.
169
170config M527x
171 bool
172
173config M5271
174 bool "MCF5271"
175 depends on !MMU
176 select M527x
177 select HAVE_CACHE_SPLIT
178 select HAVE_IPSBAR
179 select GENERIC_CLOCKEVENTS
180 help
181 Freescale (Motorola) ColdFire 5270/5271 processor support.
182
183config M5272
184 bool "MCF5272"
185 depends on !MMU
186 select COLDFIRE_SW_A7
187 select HAVE_MBAR
188 help
189 Motorola ColdFire 5272 processor support.
190
191config M5275
192 bool "MCF5275"
193 depends on !MMU
194 select M527x
195 select HAVE_CACHE_SPLIT
196 select HAVE_IPSBAR
197 select GENERIC_CLOCKEVENTS
198 help
199 Freescale (Motorola) ColdFire 5274/5275 processor support.
200
201config M528x
202 bool "MCF528x"
203 depends on !MMU
204 select GENERIC_CLOCKEVENTS
205 select HAVE_CACHE_SPLIT
206 select HAVE_IPSBAR
207 help
208 Motorola ColdFire 5280/5282 processor support.
209
210config M5307
211 bool "MCF5307"
212 depends on !MMU
213 select COLDFIRE_SW_A7
214 select HAVE_CACHE_CB
215 select HAVE_MBAR
216 help
217 Motorola ColdFire 5307 processor support.
218
219config M532x
220 bool "MCF532x"
221 depends on !MMU
222 select HAVE_CACHE_CB
223 help
224 Freescale (Motorola) ColdFire 532x processor support.
225
226config M5407
227 bool "MCF5407"
228 depends on !MMU
229 select COLDFIRE_SW_A7
230 select HAVE_CACHE_CB
231 select HAVE_MBAR
232 help
233 Motorola ColdFire 5407 processor support.
234
235config M54xx
236 bool
237
238config M547x
239 bool "MCF547x"
240 select M54xx
241 select MMU_COLDFIRE if MMU
242 select HAVE_CACHE_CB
243 select HAVE_MBAR
244 help
245 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
246
247config M548x
248 bool "MCF548x"
249 select MMU_COLDFIRE if MMU
250 select M54xx
251 select HAVE_CACHE_CB
252 select HAVE_MBAR
253 help
254 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
255
256endif # COLDFIRE
257
258
259comment "Processor Specific Options"
260
261config M68KFPU_EMU
262 bool "Math emulation support (EXPERIMENTAL)"
263 depends on MMU
264 depends on EXPERIMENTAL
265 help
266 At some point in the future, this will cause floating-point math
267 instructions to be emulated by the kernel on machines that lack a
268 floating-point math coprocessor. Thrill-seekers and chronically
269 sleep-deprived psychotic hacker types can say Y now, everyone else
270 should probably wait a while.
271
272config M68KFPU_EMU_EXTRAPREC
273 bool "Math emulation extra precision"
274 depends on M68KFPU_EMU
275 help
276 The fpu uses normally a few bit more during calculations for
277 correct rounding, the emulator can (often) do the same but this
278 extra calculation can cost quite some time, so you can disable
279 it here. The emulator will then "only" calculate with a 64 bit
280 mantissa and round slightly incorrect, what is more than enough
281 for normal usage.
282
283config M68KFPU_EMU_ONLY
284 bool "Math emulation only kernel"
285 depends on M68KFPU_EMU
286 help
287 This option prevents any floating-point instructions from being
288 compiled into the kernel, thereby the kernel doesn't save any
289 floating point context anymore during task switches, so this
290 kernel will only be usable on machines without a floating-point
291 math coprocessor. This makes the kernel a bit faster as no tests
292 needs to be executed whether a floating-point instruction in the
293 kernel should be executed or not.
294
295config ADVANCED
296 bool "Advanced configuration options"
297 depends on MMU
298 ---help---
299 This gives you access to some advanced options for the CPU. The
300 defaults should be fine for most users, but these options may make
301 it possible for you to improve performance somewhat if you know what
302 you are doing.
303
304 Note that the answer to this question won't directly affect the
305 kernel: saying N will just cause the configurator to skip all
306 the questions about these options.
307
308 Most users should say N to this question.
309
310config RMW_INSNS
311 bool "Use read-modify-write instructions"
312 depends on ADVANCED
313 ---help---
314 This allows to use certain instructions that work with indivisible
315 read-modify-write bus cycles. While this is faster than the
316 workaround of disabling interrupts, it can conflict with DMA
317 ( = direct memory access) on many Amiga systems, and it is also said
318 to destabilize other machines. It is very likely that this will
319 cause serious problems on any Amiga or Atari Medusa if set. The only
320 configuration where it should work are 68030-based Ataris, where it
321 apparently improves performance. But you've been warned! Unless you
322 really know what you are doing, say N. Try Y only if you're quite
323 adventurous.
324
325config SINGLE_MEMORY_CHUNK
326 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
327 depends on MMU
328 default y if SUN3
329 select NEED_MULTIPLE_NODES
330 help
331 Ignore all but the first contiguous chunk of physical memory for VM
332 purposes. This will save a few bytes kernel size and may speed up
333 some operations. Say N if not sure.
334
335config ARCH_DISCONTIGMEM_ENABLE
336 def_bool MMU && !SINGLE_MEMORY_CHUNK
337
338config 060_WRITETHROUGH
339 bool "Use write-through caching for 68060 supervisor accesses"
340 depends on ADVANCED && M68060
341 ---help---
342 The 68060 generally uses copyback caching of recently accessed data.
343 Copyback caching means that memory writes will be held in an on-chip
344 cache and only written back to memory some time later. Saying Y
345 here will force supervisor (kernel) accesses to use writethrough
346 caching. Writethrough caching means that data is written to memory
347 straight away, so that cache and memory data always agree.
348 Writethrough caching is less efficient, but is needed for some
349 drivers on 68060 based systems where the 68060 bus snooping signal
350 is hardwired on. The 53c710 SCSI driver is known to suffer from
351 this problem.
352
353config M68K_L2_CACHE
354 bool
355 depends on MAC
356 default y
357
358config NODES_SHIFT
359 int
360 default "3"
361 depends on !SINGLE_MEMORY_CHUNK
362
363config FPU
364 bool
365
366config COLDFIRE_SW_A7
367 bool
368
369config HAVE_CACHE_SPLIT
370 bool
371
372config HAVE_CACHE_CB
373 bool
374
375config HAVE_MBAR
376 bool
377
378config HAVE_IPSBAR
379 bool
380
381config CLOCK_SET
382 bool "Enable setting the CPU clock frequency"
383 depends on COLDFIRE
384 default n
385 help
386 On some CPU's you do not need to know what the core CPU clock
387 frequency is. On these you can disable clock setting. On some
388 traditional 68K parts, and on all ColdFire parts you need to set
389 the appropriate CPU clock frequency. On these devices many of the
390 onboard peripherals derive their timing from the master CPU clock
391 frequency.
392
393config CLOCK_FREQ
394 int "Set the core clock frequency"
395 default "66666666"
396 depends on CLOCK_SET
397 help
398 Define the CPU clock frequency in use. This is the core clock
399 frequency, it may or may not be the same as the external clock
400 crystal fitted to your board. Some processors have an internal
401 PLL and can have their frequency programmed at run time, others
402 use internal dividers. In general the kernel won't setup a PLL
403 if it is fitted (there are some exceptions). This value will be
404 specific to the exact CPU that you are using.
405
406config OLDMASK
407 bool "Old mask 5307 (1H55J) silicon"
408 depends on M5307
409 help
410 Build support for the older revision ColdFire 5307 silicon.
411 Specifically this is the 1H55J mask revision.
412
413if HAVE_CACHE_SPLIT
414choice
415 prompt "Split Cache Configuration"
416 default CACHE_I
417
418config CACHE_I
419 bool "Instruction"
420 help
421 Use all of the ColdFire CPU cache memory as an instruction cache.
422
423config CACHE_D
424 bool "Data"
425 help
426 Use all of the ColdFire CPU cache memory as a data cache.
427
428config CACHE_BOTH
429 bool "Both"
430 help
431 Split the ColdFire CPU cache, and use half as an instruction cache
432 and half as a data cache.
433endchoice
434endif
435
436if HAVE_CACHE_CB
437choice
438 prompt "Data cache mode"
439 default CACHE_WRITETHRU
440
441config CACHE_WRITETHRU
442 bool "Write-through"
443 help
444 The ColdFire CPU cache is set into Write-through mode.
445
446config CACHE_COPYBACK
447 bool "Copy-back"
448 help
449 The ColdFire CPU cache is set into Copy-back mode.
450endchoice
451endif
452