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