1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 comment "Processor Type" 2 comment "Processor Type"
3 3
4 choice 4 choice
5 prompt "CPU family support" 5 prompt "CPU family support"
6 default M68KCLASSIC if MMU 6 default M68KCLASSIC if MMU
7 default COLDFIRE if !MMU 7 default COLDFIRE if !MMU
8 help 8 help
9 The Freescale (was Motorola) M68K fa 9 The Freescale (was Motorola) M68K family of processors implements
10 the full 68000 processor instruction 10 the full 68000 processor instruction set.
11 The Freescale ColdFire family of pro 11 The Freescale ColdFire family of processors is a modern derivative
12 of the 68000 processor family. They 12 of the 68000 processor family. They are mainly targeted at embedded
13 applications, and are all System-On- 13 applications, and are all System-On-Chip (SOC) devices, as opposed
14 to stand alone CPUs. They implement 14 to stand alone CPUs. They implement a subset of the original 68000
15 processor instruction set. 15 processor instruction set.
16 If you anticipate running this kerne 16 If you anticipate running this kernel on a computer with a classic
17 MC68xxx processor, select M68KCLASSI 17 MC68xxx processor, select M68KCLASSIC.
18 If you anticipate running this kerne 18 If you anticipate running this kernel on a computer with a ColdFire
19 processor, select COLDFIRE. 19 processor, select COLDFIRE.
20 20
21 config M68KCLASSIC 21 config M68KCLASSIC
22 bool "Classic M68K CPU family support" 22 bool "Classic M68K CPU family support"
23 select HAVE_ARCH_PFN_VALID 23 select HAVE_ARCH_PFN_VALID
24 24
25 config COLDFIRE 25 config COLDFIRE
26 bool "Coldfire CPU family support" 26 bool "Coldfire CPU family support"
27 select CPU_HAS_NO_BITFIELDS 27 select CPU_HAS_NO_BITFIELDS
28 select CPU_HAS_NO_CAS 28 select CPU_HAS_NO_CAS
29 select CPU_HAS_NO_MULDIV64 29 select CPU_HAS_NO_MULDIV64
30 select GENERIC_CSUM 30 select GENERIC_CSUM
31 select GPIOLIB 31 select GPIOLIB
32 select HAVE_LEGACY_CLK 32 select HAVE_LEGACY_CLK
33 select HAVE_PAGE_SIZE_8KB if !MMU <<
34 33
35 endchoice 34 endchoice
36 35
37 if M68KCLASSIC 36 if M68KCLASSIC
38 37
39 config M68000 38 config M68000
40 def_bool y 39 def_bool y
41 depends on !MMU 40 depends on !MMU
42 select CPU_HAS_NO_BITFIELDS 41 select CPU_HAS_NO_BITFIELDS
43 select CPU_HAS_NO_CAS 42 select CPU_HAS_NO_CAS
44 select CPU_HAS_NO_MULDIV64 43 select CPU_HAS_NO_MULDIV64
45 select CPU_HAS_NO_UNALIGNED 44 select CPU_HAS_NO_UNALIGNED
46 select GENERIC_CSUM 45 select GENERIC_CSUM
47 select CPU_NO_EFFICIENT_FFS 46 select CPU_NO_EFFICIENT_FFS
48 select HAVE_ARCH_HASH 47 select HAVE_ARCH_HASH
49 select HAVE_PAGE_SIZE_4KB <<
50 select LEGACY_TIMER_TICK 48 select LEGACY_TIMER_TICK
51 help 49 help
52 The Freescale (was Motorola) 68000 C 50 The Freescale (was Motorola) 68000 CPU is the first generation of
53 the well known M68K family of proces 51 the well known M68K family of processors. The CPU core as well as
54 being available as a stand alone CPU 52 being available as a stand alone CPU was also used in many
55 System-On-Chip devices (eg 68328, 68 53 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
56 a paging MMU. 54 a paging MMU.
57 55
58 config M68020 56 config M68020
59 bool "68020 support" 57 bool "68020 support"
60 depends on MMU 58 depends on MMU
61 select FPU 59 select FPU
62 select CPU_HAS_ADDRESS_SPACES 60 select CPU_HAS_ADDRESS_SPACES
63 help 61 help
64 If you anticipate running this kerne 62 If you anticipate running this kernel on a computer with a MC68020
65 processor, say Y. Otherwise, say N. 63 processor, say Y. Otherwise, say N. Note that the 68020 requires a
66 68851 MMU (Memory Management Unit) t 64 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
67 Sun 3, which provides its own versio 65 Sun 3, which provides its own version.
68 66
69 config M68030 67 config M68030
70 bool "68030 support" 68 bool "68030 support"
71 depends on MMU && !MMU_SUN3 69 depends on MMU && !MMU_SUN3
72 select FPU 70 select FPU
73 select CPU_HAS_ADDRESS_SPACES 71 select CPU_HAS_ADDRESS_SPACES
74 help 72 help
75 If you anticipate running this kerne 73 If you anticipate running this kernel on a computer with a MC68030
76 processor, say Y. Otherwise, say N. 74 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
77 work, as it does not include an MMU 75 work, as it does not include an MMU (Memory Management Unit).
78 76
79 config M68040 77 config M68040
80 bool "68040 support" 78 bool "68040 support"
81 depends on MMU && !MMU_SUN3 79 depends on MMU && !MMU_SUN3
82 select FPU 80 select FPU
83 select CPU_HAS_ADDRESS_SPACES 81 select CPU_HAS_ADDRESS_SPACES
84 help 82 help
85 If you anticipate running this kerne 83 If you anticipate running this kernel on a computer with a MC68LC040
86 or MC68040 processor, say Y. Otherwi 84 or MC68040 processor, say Y. Otherwise, say N. Note that an
87 MC68EC040 will not work, as it does 85 MC68EC040 will not work, as it does not include an MMU (Memory
88 Management Unit). 86 Management Unit).
89 87
90 config M68060 88 config M68060
91 bool "68060 support" 89 bool "68060 support"
92 depends on MMU && !MMU_SUN3 90 depends on MMU && !MMU_SUN3
93 select FPU 91 select FPU
94 select CPU_HAS_ADDRESS_SPACES 92 select CPU_HAS_ADDRESS_SPACES
95 help 93 help
96 If you anticipate running this kerne 94 If you anticipate running this kernel on a computer with a MC68060
97 processor, say Y. Otherwise, say N. 95 processor, say Y. Otherwise, say N.
98 96
99 config M68328 97 config M68328
100 bool 98 bool
101 depends on !MMU 99 depends on !MMU
102 select M68000 100 select M68000
103 help 101 help
104 Motorola 68328 processor support. 102 Motorola 68328 processor support.
105 103
106 config M68EZ328 104 config M68EZ328
107 bool 105 bool
108 depends on !MMU 106 depends on !MMU
109 select M68000 107 select M68000
110 help 108 help
111 Motorola 68EX328 processor support. 109 Motorola 68EX328 processor support.
112 110
113 config M68VZ328 111 config M68VZ328
114 bool 112 bool
115 depends on !MMU 113 depends on !MMU
116 select M68000 114 select M68000
117 help 115 help
118 Motorola 68VZ328 processor support. 116 Motorola 68VZ328 processor support.
119 117
120 endif # M68KCLASSIC 118 endif # M68KCLASSIC
121 119
122 if COLDFIRE 120 if COLDFIRE
123 121
124 choice 122 choice
125 prompt "ColdFire SoC type" 123 prompt "ColdFire SoC type"
126 default M520x 124 default M520x
127 help 125 help
128 Select the type of ColdFire System-o 126 Select the type of ColdFire System-on-Chip (SoC) that you want
129 to build for. 127 to build for.
130 128
131 config M5206 129 config M5206
132 bool "MCF5206" 130 bool "MCF5206"
133 depends on !MMU 131 depends on !MMU
134 select COLDFIRE_SW_A7 132 select COLDFIRE_SW_A7
135 select COLDFIRE_TIMERS 133 select COLDFIRE_TIMERS
136 select HAVE_MBAR 134 select HAVE_MBAR
137 select CPU_NO_EFFICIENT_FFS 135 select CPU_NO_EFFICIENT_FFS
138 help 136 help
139 Motorola ColdFire 5206 processor sup 137 Motorola ColdFire 5206 processor support.
140 138
141 config M5206e 139 config M5206e
142 bool "MCF5206e" 140 bool "MCF5206e"
143 depends on !MMU 141 depends on !MMU
144 select COLDFIRE_SW_A7 142 select COLDFIRE_SW_A7
145 select COLDFIRE_TIMERS 143 select COLDFIRE_TIMERS
146 select HAVE_MBAR 144 select HAVE_MBAR
147 select CPU_NO_EFFICIENT_FFS 145 select CPU_NO_EFFICIENT_FFS
148 help 146 help
149 Motorola ColdFire 5206e processor su 147 Motorola ColdFire 5206e processor support.
150 148
151 config M520x 149 config M520x
152 bool "MCF520x" 150 bool "MCF520x"
153 depends on !MMU 151 depends on !MMU
154 select COLDFIRE_PIT_TIMER 152 select COLDFIRE_PIT_TIMER
155 select HAVE_CACHE_SPLIT 153 select HAVE_CACHE_SPLIT
156 help 154 help
157 Freescale Coldfire 5207/5208 process 155 Freescale Coldfire 5207/5208 processor support.
158 156
159 config M523x 157 config M523x
160 bool "MCF523x" 158 bool "MCF523x"
161 depends on !MMU 159 depends on !MMU
162 select COLDFIRE_PIT_TIMER 160 select COLDFIRE_PIT_TIMER
163 select HAVE_CACHE_SPLIT 161 select HAVE_CACHE_SPLIT
164 select HAVE_IPSBAR 162 select HAVE_IPSBAR
165 help 163 help
166 Freescale Coldfire 5230/1/2/4/5 proc 164 Freescale Coldfire 5230/1/2/4/5 processor support
167 165
168 config M5249 166 config M5249
169 bool "MCF5249" 167 bool "MCF5249"
170 depends on !MMU 168 depends on !MMU
171 select COLDFIRE_SW_A7 169 select COLDFIRE_SW_A7
172 select COLDFIRE_TIMERS 170 select COLDFIRE_TIMERS
173 select HAVE_MBAR 171 select HAVE_MBAR
174 select CPU_NO_EFFICIENT_FFS 172 select CPU_NO_EFFICIENT_FFS
175 help 173 help
176 Motorola ColdFire 5249 processor sup 174 Motorola ColdFire 5249 processor support.
177 175
178 config M525x 176 config M525x
179 bool "MCF525x" 177 bool "MCF525x"
180 depends on !MMU 178 depends on !MMU
181 select COLDFIRE_SW_A7 179 select COLDFIRE_SW_A7
182 select COLDFIRE_TIMERS 180 select COLDFIRE_TIMERS
183 select HAVE_MBAR 181 select HAVE_MBAR
184 select CPU_NO_EFFICIENT_FFS 182 select CPU_NO_EFFICIENT_FFS
185 help 183 help
186 Freescale (Motorola) Coldfire 5251/5 184 Freescale (Motorola) Coldfire 5251/5253 processor support.
187 185
188 config M5271 186 config M5271
189 bool "MCF5271" 187 bool "MCF5271"
190 depends on !MMU 188 depends on !MMU
191 select COLDFIRE_PIT_TIMER 189 select COLDFIRE_PIT_TIMER
192 select M527x 190 select M527x
193 select HAVE_CACHE_SPLIT 191 select HAVE_CACHE_SPLIT
194 select HAVE_IPSBAR 192 select HAVE_IPSBAR
195 help 193 help
196 Freescale (Motorola) ColdFire 5270/5 194 Freescale (Motorola) ColdFire 5270/5271 processor support.
197 195
198 config M5272 196 config M5272
199 bool "MCF5272" 197 bool "MCF5272"
200 depends on !MMU 198 depends on !MMU
201 select COLDFIRE_SW_A7 199 select COLDFIRE_SW_A7
202 select COLDFIRE_TIMERS 200 select COLDFIRE_TIMERS
203 select HAVE_MBAR 201 select HAVE_MBAR
204 select CPU_NO_EFFICIENT_FFS 202 select CPU_NO_EFFICIENT_FFS
205 help 203 help
206 Motorola ColdFire 5272 processor sup 204 Motorola ColdFire 5272 processor support.
207 205
208 config M5275 206 config M5275
209 bool "MCF5275" 207 bool "MCF5275"
210 depends on !MMU 208 depends on !MMU
211 select COLDFIRE_PIT_TIMER 209 select COLDFIRE_PIT_TIMER
212 select M527x 210 select M527x
213 select HAVE_CACHE_SPLIT 211 select HAVE_CACHE_SPLIT
214 select HAVE_IPSBAR 212 select HAVE_IPSBAR
215 help 213 help
216 Freescale (Motorola) ColdFire 5274/5 214 Freescale (Motorola) ColdFire 5274/5275 processor support.
217 215
218 config M528x 216 config M528x
219 bool "MCF528x" 217 bool "MCF528x"
220 depends on !MMU 218 depends on !MMU
221 select COLDFIRE_PIT_TIMER 219 select COLDFIRE_PIT_TIMER
222 select HAVE_CACHE_SPLIT 220 select HAVE_CACHE_SPLIT
223 select HAVE_IPSBAR 221 select HAVE_IPSBAR
224 help 222 help
225 Motorola ColdFire 5280/5282 processo 223 Motorola ColdFire 5280/5282 processor support.
226 224
227 config M5307 225 config M5307
228 bool "MCF5307" 226 bool "MCF5307"
229 depends on !MMU 227 depends on !MMU
230 select COLDFIRE_TIMERS 228 select COLDFIRE_TIMERS
231 select COLDFIRE_SW_A7 229 select COLDFIRE_SW_A7
232 select HAVE_CACHE_CB 230 select HAVE_CACHE_CB
233 select HAVE_MBAR 231 select HAVE_MBAR
234 select CPU_NO_EFFICIENT_FFS 232 select CPU_NO_EFFICIENT_FFS
235 help 233 help
236 Motorola ColdFire 5307 processor sup 234 Motorola ColdFire 5307 processor support.
237 235
238 config M532x 236 config M532x
239 bool "MCF532x" 237 bool "MCF532x"
240 depends on !MMU 238 depends on !MMU
241 select COLDFIRE_TIMERS 239 select COLDFIRE_TIMERS
242 select M53xx 240 select M53xx
243 select HAVE_CACHE_CB 241 select HAVE_CACHE_CB
244 help 242 help
245 Freescale (Motorola) ColdFire 532x p 243 Freescale (Motorola) ColdFire 532x processor support.
246 244
247 config M537x 245 config M537x
248 bool "MCF537x" 246 bool "MCF537x"
249 depends on !MMU 247 depends on !MMU
250 select COLDFIRE_TIMERS 248 select COLDFIRE_TIMERS
251 select M53xx 249 select M53xx
252 select HAVE_CACHE_CB 250 select HAVE_CACHE_CB
253 help 251 help
254 Freescale ColdFire 537x processor su 252 Freescale ColdFire 537x processor support.
255 253
256 config M5407 254 config M5407
257 bool "MCF5407" 255 bool "MCF5407"
258 depends on !MMU 256 depends on !MMU
259 select COLDFIRE_SW_A7 257 select COLDFIRE_SW_A7
260 select COLDFIRE_TIMERS 258 select COLDFIRE_TIMERS
261 select HAVE_CACHE_CB 259 select HAVE_CACHE_CB
262 select HAVE_MBAR 260 select HAVE_MBAR
263 select CPU_NO_EFFICIENT_FFS 261 select CPU_NO_EFFICIENT_FFS
264 help 262 help
265 Motorola ColdFire 5407 processor sup 263 Motorola ColdFire 5407 processor support.
266 264
267 config M547x 265 config M547x
268 bool "MCF547x" 266 bool "MCF547x"
269 select M54xx 267 select M54xx
270 select COLDFIRE_SLTIMERS 268 select COLDFIRE_SLTIMERS
271 select MMU_COLDFIRE if MMU 269 select MMU_COLDFIRE if MMU
272 select FPU if MMU 270 select FPU if MMU
273 select HAVE_CACHE_CB 271 select HAVE_CACHE_CB
274 select HAVE_MBAR 272 select HAVE_MBAR
275 select CPU_NO_EFFICIENT_FFS 273 select CPU_NO_EFFICIENT_FFS
276 help 274 help
277 Freescale ColdFire 5470/5471/5472/54 275 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
278 276
279 config M548x 277 config M548x
280 bool "MCF548x" 278 bool "MCF548x"
281 select COLDFIRE_SLTIMERS 279 select COLDFIRE_SLTIMERS
282 select MMU_COLDFIRE if MMU 280 select MMU_COLDFIRE if MMU
283 select FPU if MMU 281 select FPU if MMU
284 select M54xx 282 select M54xx
285 select HAVE_CACHE_CB 283 select HAVE_CACHE_CB
286 select HAVE_MBAR 284 select HAVE_MBAR
287 select CPU_NO_EFFICIENT_FFS 285 select CPU_NO_EFFICIENT_FFS
288 help 286 help
289 Freescale ColdFire 5480/5481/5482/54 287 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
290 288
291 config M5441x 289 config M5441x
292 bool "MCF5441x" 290 bool "MCF5441x"
293 select COLDFIRE_PIT_TIMER 291 select COLDFIRE_PIT_TIMER
294 select MMU_COLDFIRE if MMU 292 select MMU_COLDFIRE if MMU
295 select HAVE_CACHE_CB 293 select HAVE_CACHE_CB
296 help 294 help
297 Freescale Coldfire 54410/54415/54416 295 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
298 296
299 endchoice 297 endchoice
300 298
301 config M527x 299 config M527x
302 bool 300 bool
303 301
304 config M53xx 302 config M53xx
305 bool 303 bool
306 304
307 config M54xx 305 config M54xx
308 select HAVE_PCI 306 select HAVE_PCI
309 bool 307 bool
310 308
311 config COLDFIRE_PIT_TIMER 309 config COLDFIRE_PIT_TIMER
312 bool 310 bool
313 311
314 config COLDFIRE_TIMERS 312 config COLDFIRE_TIMERS
315 bool 313 bool
316 select LEGACY_TIMER_TICK 314 select LEGACY_TIMER_TICK
317 315
318 config COLDFIRE_SLTIMERS 316 config COLDFIRE_SLTIMERS
319 bool 317 bool
320 select LEGACY_TIMER_TICK 318 select LEGACY_TIMER_TICK
321 319
322 endif # COLDFIRE 320 endif # COLDFIRE
323 321
324 comment "Processor Specific Options" 322 comment "Processor Specific Options"
325 323
326 config M68KFPU_EMU 324 config M68KFPU_EMU
327 bool "Math emulation support" 325 bool "Math emulation support"
328 depends on M68KCLASSIC && FPU 326 depends on M68KCLASSIC && FPU
329 help 327 help
330 At some point in the future, this wi 328 At some point in the future, this will cause floating-point math
331 instructions to be emulated by the k 329 instructions to be emulated by the kernel on machines that lack a
332 floating-point math coprocessor. Th 330 floating-point math coprocessor. Thrill-seekers and chronically
333 sleep-deprived psychotic hacker type 331 sleep-deprived psychotic hacker types can say Y now, everyone else
334 should probably wait a while. 332 should probably wait a while.
335 333
336 config M68KFPU_EMU_EXTRAPREC 334 config M68KFPU_EMU_EXTRAPREC
337 bool "Math emulation extra precision" 335 bool "Math emulation extra precision"
338 depends on M68KFPU_EMU 336 depends on M68KFPU_EMU
339 help 337 help
340 The fpu uses normally a few bit more 338 The fpu uses normally a few bit more during calculations for
341 correct rounding, the emulator can ( 339 correct rounding, the emulator can (often) do the same but this
342 extra calculation can cost quite som 340 extra calculation can cost quite some time, so you can disable
343 it here. The emulator will then "onl 341 it here. The emulator will then "only" calculate with a 64 bit
344 mantissa and round slightly incorrec 342 mantissa and round slightly incorrect, what is more than enough
345 for normal usage. 343 for normal usage.
346 344
347 config M68KFPU_EMU_ONLY 345 config M68KFPU_EMU_ONLY
348 bool "Math emulation only kernel" 346 bool "Math emulation only kernel"
349 depends on M68KFPU_EMU 347 depends on M68KFPU_EMU
350 help 348 help
351 This option prevents any floating-po 349 This option prevents any floating-point instructions from being
352 compiled into the kernel, thereby th 350 compiled into the kernel, thereby the kernel doesn't save any
353 floating point context anymore durin 351 floating point context anymore during task switches, so this
354 kernel will only be usable on machin 352 kernel will only be usable on machines without a floating-point
355 math coprocessor. This makes the ker 353 math coprocessor. This makes the kernel a bit faster as no tests
356 needs to be executed whether a float 354 needs to be executed whether a floating-point instruction in the
357 kernel should be executed or not. 355 kernel should be executed or not.
358 356
359 config ADVANCED 357 config ADVANCED
360 bool "Advanced configuration options" 358 bool "Advanced configuration options"
361 depends on MMU 359 depends on MMU
362 help 360 help
363 This gives you access to some advanc 361 This gives you access to some advanced options for the CPU. The
364 defaults should be fine for most use 362 defaults should be fine for most users, but these options may make
365 it possible for you to improve perfo 363 it possible for you to improve performance somewhat if you know what
366 you are doing. 364 you are doing.
367 365
368 Note that the answer to this questio 366 Note that the answer to this question won't directly affect the
369 kernel: saying N will just cause the 367 kernel: saying N will just cause the configurator to skip all
370 the questions about these options. 368 the questions about these options.
371 369
372 Most users should say N to this ques 370 Most users should say N to this question.
373 371
374 config RMW_INSNS 372 config RMW_INSNS
375 bool "Use read-modify-write instructio 373 bool "Use read-modify-write instructions"
376 depends on ADVANCED && !CPU_HAS_NO_CAS 374 depends on ADVANCED && !CPU_HAS_NO_CAS
377 help 375 help
378 This allows to use certain instructi 376 This allows to use certain instructions that work with indivisible
379 read-modify-write bus cycles. While 377 read-modify-write bus cycles. While this is faster than the
380 workaround of disabling interrupts, 378 workaround of disabling interrupts, it can conflict with DMA
381 ( = direct memory access) on many Am 379 ( = direct memory access) on many Amiga systems, and it is also said
382 to destabilize other machines. It is 380 to destabilize other machines. It is very likely that this will
383 cause serious problems on any Amiga 381 cause serious problems on any Amiga or Atari Medusa if set. The only
384 configuration where it should work a 382 configuration where it should work are 68030-based Ataris, where it
385 apparently improves performance. But 383 apparently improves performance. But you've been warned! Unless you
386 really know what you are doing, say 384 really know what you are doing, say N. Try Y only if you're quite
387 adventurous. 385 adventurous.
388 386
389 config SINGLE_MEMORY_CHUNK 387 config SINGLE_MEMORY_CHUNK
390 bool "Use one physical chunk of memory 388 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
391 depends on MMU 389 depends on MMU
392 default y if SUN3 || MMU_COLDFIRE 390 default y if SUN3 || MMU_COLDFIRE
393 help 391 help
394 Ignore all but the first contiguous 392 Ignore all but the first contiguous chunk of physical memory for VM
395 purposes. This will save a few byte 393 purposes. This will save a few bytes kernel size and may speed up
396 some operations. 394 some operations.
397 When this option os set to N, you ma 395 When this option os set to N, you may want to lower "Maximum zone
398 order" to save memory that could be 396 order" to save memory that could be wasted for unused memory map.
399 Say N if not sure. 397 Say N if not sure.
400 398
401 config ARCH_FORCE_MAX_ORDER 399 config ARCH_FORCE_MAX_ORDER
402 int "Order of maximal physically conti 400 int "Order of maximal physically contiguous allocations" if ADVANCED
403 depends on !SINGLE_MEMORY_CHUNK 401 depends on !SINGLE_MEMORY_CHUNK
404 default "10" 402 default "10"
405 help 403 help
406 The kernel page allocator limits the 404 The kernel page allocator limits the size of maximal physically
407 contiguous allocations. The limit is 405 contiguous allocations. The limit is called MAX_PAGE_ORDER and it
408 defines the maximal power of two of 406 defines the maximal power of two of number of pages that can be
409 allocated as a single contiguous blo 407 allocated as a single contiguous block. This option allows
410 overriding the default setting when 408 overriding the default setting when ability to allocate very
411 large blocks of physically contiguou 409 large blocks of physically contiguous memory is required.
412 410
413 For systems that have holes in their 411 For systems that have holes in their physical address space this
414 value also defines the minimal size 412 value also defines the minimal size of the hole that allows
415 freeing unused memory map. 413 freeing unused memory map.
416 414
417 Don't change if unsure. 415 Don't change if unsure.
418 416
419 config 060_WRITETHROUGH 417 config 060_WRITETHROUGH
420 bool "Use write-through caching for 68 418 bool "Use write-through caching for 68060 supervisor accesses"
421 depends on ADVANCED && M68060 419 depends on ADVANCED && M68060
422 help 420 help
423 The 68060 generally uses copyback ca 421 The 68060 generally uses copyback caching of recently accessed data.
424 Copyback caching means that memory w 422 Copyback caching means that memory writes will be held in an on-chip
425 cache and only written back to memor 423 cache and only written back to memory some time later. Saying Y
426 here will force supervisor (kernel) 424 here will force supervisor (kernel) accesses to use writethrough
427 caching. Writethrough caching means 425 caching. Writethrough caching means that data is written to memory
428 straight away, so that cache and mem 426 straight away, so that cache and memory data always agree.
429 Writethrough caching is less efficie 427 Writethrough caching is less efficient, but is needed for some
430 drivers on 68060 based systems where 428 drivers on 68060 based systems where the 68060 bus snooping signal
431 is hardwired on. The 53c710 SCSI dr 429 is hardwired on. The 53c710 SCSI driver is known to suffer from
432 this problem. 430 this problem.
433 431
434 config M68K_L2_CACHE 432 config M68K_L2_CACHE
435 bool 433 bool
436 depends on MAC 434 depends on MAC
437 default y 435 default y
438 436
439 config CPU_HAS_NO_BITFIELDS 437 config CPU_HAS_NO_BITFIELDS
440 bool 438 bool
441 439
442 config CPU_HAS_NO_CAS 440 config CPU_HAS_NO_CAS
443 bool 441 bool
444 442
445 config CPU_HAS_NO_MULDIV64 443 config CPU_HAS_NO_MULDIV64
446 bool 444 bool
447 445
448 config CPU_HAS_NO_UNALIGNED 446 config CPU_HAS_NO_UNALIGNED
449 bool 447 bool
450 448
451 config CPU_HAS_ADDRESS_SPACES 449 config CPU_HAS_ADDRESS_SPACES
452 bool 450 bool
453 select ALTERNATE_USER_ADDRESS_SPACE 451 select ALTERNATE_USER_ADDRESS_SPACE
454 452
455 config FPU 453 config FPU
456 bool 454 bool
457 455
458 config COLDFIRE_SW_A7 456 config COLDFIRE_SW_A7
459 bool 457 bool
460 458
461 config HAVE_CACHE_SPLIT 459 config HAVE_CACHE_SPLIT
462 bool 460 bool
463 461
464 config HAVE_CACHE_CB 462 config HAVE_CACHE_CB
465 bool 463 bool
466 464
467 config HAVE_MBAR 465 config HAVE_MBAR
468 bool 466 bool
469 467
470 config HAVE_IPSBAR 468 config HAVE_IPSBAR
471 bool 469 bool
472 470
473 config CLOCK_FREQ 471 config CLOCK_FREQ
474 int "Set the core clock frequency" 472 int "Set the core clock frequency"
475 default "25000000" if M5206 473 default "25000000" if M5206
476 default "54000000" if M5206e 474 default "54000000" if M5206e
477 default "166666666" if M520x 475 default "166666666" if M520x
478 default "140000000" if M5249 476 default "140000000" if M5249
479 default "150000000" if M527x || M523x 477 default "150000000" if M527x || M523x
480 default "90000000" if M5307 478 default "90000000" if M5307
481 default "50000000" if M5407 479 default "50000000" if M5407
482 default "266000000" if M54xx 480 default "266000000" if M54xx
483 default "66666666" 481 default "66666666"
484 depends on COLDFIRE 482 depends on COLDFIRE
485 help 483 help
486 Define the CPU clock frequency in us 484 Define the CPU clock frequency in use. This is the core clock
487 frequency, it may or may not be the 485 frequency, it may or may not be the same as the external clock
488 crystal fitted to your board. Some p 486 crystal fitted to your board. Some processors have an internal
489 PLL and can have their frequency pro 487 PLL and can have their frequency programmed at run time, others
490 use internal dividers. In general th 488 use internal dividers. In general the kernel won't setup a PLL
491 if it is fitted (there are some exce 489 if it is fitted (there are some exceptions). This value will be
492 specific to the exact CPU that you a 490 specific to the exact CPU that you are using.
493 491
494 config OLDMASK 492 config OLDMASK
495 bool "Old mask 5307 (1H55J) silicon" 493 bool "Old mask 5307 (1H55J) silicon"
496 depends on M5307 494 depends on M5307
497 help 495 help
498 Build support for the older revision 496 Build support for the older revision ColdFire 5307 silicon.
499 Specifically this is the 1H55J mask 497 Specifically this is the 1H55J mask revision.
500 498
501 if HAVE_CACHE_SPLIT 499 if HAVE_CACHE_SPLIT
502 choice 500 choice
503 prompt "Split Cache Configuration" 501 prompt "Split Cache Configuration"
504 default CACHE_I 502 default CACHE_I
505 503
506 config CACHE_I 504 config CACHE_I
507 bool "Instruction" 505 bool "Instruction"
508 help 506 help
509 Use all of the ColdFire CPU cache me 507 Use all of the ColdFire CPU cache memory as an instruction cache.
510 508
511 config CACHE_D 509 config CACHE_D
512 bool "Data" 510 bool "Data"
513 help 511 help
514 Use all of the ColdFire CPU cache me 512 Use all of the ColdFire CPU cache memory as a data cache.
515 513
516 config CACHE_BOTH 514 config CACHE_BOTH
517 bool "Both" 515 bool "Both"
518 help 516 help
519 Split the ColdFire CPU cache, and us 517 Split the ColdFire CPU cache, and use half as an instruction cache
520 and half as a data cache. 518 and half as a data cache.
521 endchoice 519 endchoice
522 endif # HAVE_CACHE_SPLIT 520 endif # HAVE_CACHE_SPLIT
523 521
524 if HAVE_CACHE_CB 522 if HAVE_CACHE_CB
525 choice 523 choice
526 prompt "Data cache mode" 524 prompt "Data cache mode"
527 default CACHE_WRITETHRU 525 default CACHE_WRITETHRU
528 526
529 config CACHE_WRITETHRU 527 config CACHE_WRITETHRU
530 bool "Write-through" 528 bool "Write-through"
531 help 529 help
532 The ColdFire CPU cache is set into W 530 The ColdFire CPU cache is set into Write-through mode.
533 531
534 config CACHE_COPYBACK 532 config CACHE_COPYBACK
535 bool "Copy-back" 533 bool "Copy-back"
536 help 534 help
537 The ColdFire CPU cache is set into C 535 The ColdFire CPU cache is set into Copy-back mode.
538 endchoice 536 endchoice
539 endif # HAVE_CACHE_CB 537 endif # HAVE_CACHE_CB
540 538
541 # Coldfire cores that do not have a data cache 539 # Coldfire cores that do not have a data cache configured can do coherent DMA.
542 config COLDFIRE_COHERENT_DMA 540 config COLDFIRE_COHERENT_DMA
543 bool 541 bool
544 default y 542 default y
545 depends on COLDFIRE 543 depends on COLDFIRE
546 depends on !HAVE_CACHE_CB && !CACHE_D 544 depends on !HAVE_CACHE_CB && !CACHE_D && !CACHE_BOTH
547 545
548 config M68K_NONCOHERENT_DMA 546 config M68K_NONCOHERENT_DMA
549 bool 547 bool
550 default y 548 default y
551 depends on HAS_DMA && !COLDFIRE_COHERE 549 depends on HAS_DMA && !COLDFIRE_COHERENT_DMA
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