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 ARCH_HAVE_CUSTOM_GPIO_H
27 select CPU_HAS_NO_BITFIELDS 28 select CPU_HAS_NO_BITFIELDS
28 select CPU_HAS_NO_CAS 29 select CPU_HAS_NO_CAS
29 select CPU_HAS_NO_MULDIV64 30 select CPU_HAS_NO_MULDIV64
30 select GENERIC_CSUM 31 select GENERIC_CSUM
31 select GPIOLIB 32 select GPIOLIB
32 select HAVE_LEGACY_CLK 33 select HAVE_LEGACY_CLK
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 <<
50 select LEGACY_TIMER_TICK 49 select LEGACY_TIMER_TICK
51 help 50 help
52 The Freescale (was Motorola) 68000 C 51 The Freescale (was Motorola) 68000 CPU is the first generation of
53 the well known M68K family of proces 52 the well known M68K family of processors. The CPU core as well as
54 being available as a stand alone CPU 53 being available as a stand alone CPU was also used in many
55 System-On-Chip devices (eg 68328, 68 54 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
56 a paging MMU. 55 a paging MMU.
57 56
58 config M68020 57 config M68020
59 bool "68020 support" 58 bool "68020 support"
60 depends on MMU 59 depends on MMU
61 select FPU 60 select FPU
62 select CPU_HAS_ADDRESS_SPACES 61 select CPU_HAS_ADDRESS_SPACES
63 help 62 help
64 If you anticipate running this kerne 63 If you anticipate running this kernel on a computer with a MC68020
65 processor, say Y. Otherwise, say N. 64 processor, say Y. Otherwise, say N. Note that the 68020 requires a
66 68851 MMU (Memory Management Unit) t 65 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
67 Sun 3, which provides its own versio 66 Sun 3, which provides its own version.
68 67
69 config M68030 68 config M68030
70 bool "68030 support" 69 bool "68030 support"
71 depends on MMU && !MMU_SUN3 70 depends on MMU && !MMU_SUN3
72 select FPU 71 select FPU
73 select CPU_HAS_ADDRESS_SPACES 72 select CPU_HAS_ADDRESS_SPACES
74 help 73 help
75 If you anticipate running this kerne 74 If you anticipate running this kernel on a computer with a MC68030
76 processor, say Y. Otherwise, say N. 75 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
77 work, as it does not include an MMU 76 work, as it does not include an MMU (Memory Management Unit).
78 77
79 config M68040 78 config M68040
80 bool "68040 support" 79 bool "68040 support"
81 depends on MMU && !MMU_SUN3 80 depends on MMU && !MMU_SUN3
82 select FPU 81 select FPU
83 select CPU_HAS_ADDRESS_SPACES 82 select CPU_HAS_ADDRESS_SPACES
84 help 83 help
85 If you anticipate running this kerne 84 If you anticipate running this kernel on a computer with a MC68LC040
86 or MC68040 processor, say Y. Otherwi 85 or MC68040 processor, say Y. Otherwise, say N. Note that an
87 MC68EC040 will not work, as it does 86 MC68EC040 will not work, as it does not include an MMU (Memory
88 Management Unit). 87 Management Unit).
89 88
90 config M68060 89 config M68060
91 bool "68060 support" 90 bool "68060 support"
92 depends on MMU && !MMU_SUN3 91 depends on MMU && !MMU_SUN3
93 select FPU 92 select FPU
94 select CPU_HAS_ADDRESS_SPACES 93 select CPU_HAS_ADDRESS_SPACES
95 help 94 help
96 If you anticipate running this kerne 95 If you anticipate running this kernel on a computer with a MC68060
97 processor, say Y. Otherwise, say N. 96 processor, say Y. Otherwise, say N.
98 97
99 config M68328 98 config M68328
100 bool 99 bool
101 depends on !MMU 100 depends on !MMU
102 select M68000 101 select M68000
103 help 102 help
104 Motorola 68328 processor support. 103 Motorola 68328 processor support.
105 104
106 config M68EZ328 105 config M68EZ328
107 bool 106 bool
108 depends on !MMU 107 depends on !MMU
109 select M68000 108 select M68000
110 help 109 help
111 Motorola 68EX328 processor support. 110 Motorola 68EX328 processor support.
112 111
113 config M68VZ328 112 config M68VZ328
114 bool 113 bool
115 depends on !MMU 114 depends on !MMU
116 select M68000 115 select M68000
117 help 116 help
118 Motorola 68VZ328 processor support. 117 Motorola 68VZ328 processor support.
119 118
120 endif # M68KCLASSIC 119 endif # M68KCLASSIC
121 120
122 if COLDFIRE 121 if COLDFIRE
123 122
124 choice 123 choice
125 prompt "ColdFire SoC type" 124 prompt "ColdFire SoC type"
126 default M520x 125 default M520x
127 help 126 help
128 Select the type of ColdFire System-o 127 Select the type of ColdFire System-on-Chip (SoC) that you want
129 to build for. 128 to build for.
130 129
131 config M5206 130 config M5206
132 bool "MCF5206" 131 bool "MCF5206"
133 depends on !MMU 132 depends on !MMU
134 select COLDFIRE_SW_A7 133 select COLDFIRE_SW_A7
135 select COLDFIRE_TIMERS 134 select COLDFIRE_TIMERS
136 select HAVE_MBAR 135 select HAVE_MBAR
137 select CPU_NO_EFFICIENT_FFS 136 select CPU_NO_EFFICIENT_FFS
138 help 137 help
139 Motorola ColdFire 5206 processor sup 138 Motorola ColdFire 5206 processor support.
140 139
141 config M5206e 140 config M5206e
142 bool "MCF5206e" 141 bool "MCF5206e"
143 depends on !MMU 142 depends on !MMU
144 select COLDFIRE_SW_A7 143 select COLDFIRE_SW_A7
145 select COLDFIRE_TIMERS 144 select COLDFIRE_TIMERS
146 select HAVE_MBAR 145 select HAVE_MBAR
147 select CPU_NO_EFFICIENT_FFS 146 select CPU_NO_EFFICIENT_FFS
148 help 147 help
149 Motorola ColdFire 5206e processor su 148 Motorola ColdFire 5206e processor support.
150 149
151 config M520x 150 config M520x
152 bool "MCF520x" 151 bool "MCF520x"
153 depends on !MMU 152 depends on !MMU
154 select COLDFIRE_PIT_TIMER 153 select COLDFIRE_PIT_TIMER
155 select HAVE_CACHE_SPLIT 154 select HAVE_CACHE_SPLIT
156 help 155 help
157 Freescale Coldfire 5207/5208 process 156 Freescale Coldfire 5207/5208 processor support.
158 157
159 config M523x 158 config M523x
160 bool "MCF523x" 159 bool "MCF523x"
161 depends on !MMU 160 depends on !MMU
162 select COLDFIRE_PIT_TIMER 161 select COLDFIRE_PIT_TIMER
163 select HAVE_CACHE_SPLIT 162 select HAVE_CACHE_SPLIT
164 select HAVE_IPSBAR 163 select HAVE_IPSBAR
165 help 164 help
166 Freescale Coldfire 5230/1/2/4/5 proc 165 Freescale Coldfire 5230/1/2/4/5 processor support
167 166
168 config M5249 167 config M5249
169 bool "MCF5249" 168 bool "MCF5249"
170 depends on !MMU 169 depends on !MMU
171 select COLDFIRE_SW_A7 170 select COLDFIRE_SW_A7
172 select COLDFIRE_TIMERS 171 select COLDFIRE_TIMERS
173 select HAVE_MBAR 172 select HAVE_MBAR
174 select CPU_NO_EFFICIENT_FFS 173 select CPU_NO_EFFICIENT_FFS
175 help 174 help
176 Motorola ColdFire 5249 processor sup 175 Motorola ColdFire 5249 processor support.
177 176
178 config M525x 177 config M525x
179 bool "MCF525x" 178 bool "MCF525x"
180 depends on !MMU 179 depends on !MMU
181 select COLDFIRE_SW_A7 180 select COLDFIRE_SW_A7
182 select COLDFIRE_TIMERS 181 select COLDFIRE_TIMERS
183 select HAVE_MBAR 182 select HAVE_MBAR
184 select CPU_NO_EFFICIENT_FFS 183 select CPU_NO_EFFICIENT_FFS
185 help 184 help
186 Freescale (Motorola) Coldfire 5251/5 185 Freescale (Motorola) Coldfire 5251/5253 processor support.
187 186
188 config M5271 187 config M5271
189 bool "MCF5271" 188 bool "MCF5271"
190 depends on !MMU 189 depends on !MMU
191 select COLDFIRE_PIT_TIMER 190 select COLDFIRE_PIT_TIMER
192 select M527x 191 select M527x
193 select HAVE_CACHE_SPLIT 192 select HAVE_CACHE_SPLIT
194 select HAVE_IPSBAR 193 select HAVE_IPSBAR
195 help 194 help
196 Freescale (Motorola) ColdFire 5270/5 195 Freescale (Motorola) ColdFire 5270/5271 processor support.
197 196
198 config M5272 197 config M5272
199 bool "MCF5272" 198 bool "MCF5272"
200 depends on !MMU 199 depends on !MMU
201 select COLDFIRE_SW_A7 200 select COLDFIRE_SW_A7
202 select COLDFIRE_TIMERS 201 select COLDFIRE_TIMERS
203 select HAVE_MBAR 202 select HAVE_MBAR
204 select CPU_NO_EFFICIENT_FFS 203 select CPU_NO_EFFICIENT_FFS
205 help 204 help
206 Motorola ColdFire 5272 processor sup 205 Motorola ColdFire 5272 processor support.
207 206
208 config M5275 207 config M5275
209 bool "MCF5275" 208 bool "MCF5275"
210 depends on !MMU 209 depends on !MMU
211 select COLDFIRE_PIT_TIMER 210 select COLDFIRE_PIT_TIMER
212 select M527x 211 select M527x
213 select HAVE_CACHE_SPLIT 212 select HAVE_CACHE_SPLIT
214 select HAVE_IPSBAR 213 select HAVE_IPSBAR
215 help 214 help
216 Freescale (Motorola) ColdFire 5274/5 215 Freescale (Motorola) ColdFire 5274/5275 processor support.
217 216
218 config M528x 217 config M528x
219 bool "MCF528x" 218 bool "MCF528x"
220 depends on !MMU 219 depends on !MMU
221 select COLDFIRE_PIT_TIMER 220 select COLDFIRE_PIT_TIMER
222 select HAVE_CACHE_SPLIT 221 select HAVE_CACHE_SPLIT
223 select HAVE_IPSBAR 222 select HAVE_IPSBAR
224 help 223 help
225 Motorola ColdFire 5280/5282 processo 224 Motorola ColdFire 5280/5282 processor support.
226 225
227 config M5307 226 config M5307
228 bool "MCF5307" 227 bool "MCF5307"
229 depends on !MMU 228 depends on !MMU
230 select COLDFIRE_TIMERS 229 select COLDFIRE_TIMERS
231 select COLDFIRE_SW_A7 230 select COLDFIRE_SW_A7
232 select HAVE_CACHE_CB 231 select HAVE_CACHE_CB
233 select HAVE_MBAR 232 select HAVE_MBAR
234 select CPU_NO_EFFICIENT_FFS 233 select CPU_NO_EFFICIENT_FFS
235 help 234 help
236 Motorola ColdFire 5307 processor sup 235 Motorola ColdFire 5307 processor support.
237 236
238 config M532x 237 config M532x
239 bool "MCF532x" 238 bool "MCF532x"
240 depends on !MMU 239 depends on !MMU
241 select COLDFIRE_TIMERS 240 select COLDFIRE_TIMERS
242 select M53xx 241 select M53xx
243 select HAVE_CACHE_CB 242 select HAVE_CACHE_CB
244 help 243 help
245 Freescale (Motorola) ColdFire 532x p 244 Freescale (Motorola) ColdFire 532x processor support.
246 245
247 config M537x 246 config M537x
248 bool "MCF537x" 247 bool "MCF537x"
249 depends on !MMU 248 depends on !MMU
250 select COLDFIRE_TIMERS 249 select COLDFIRE_TIMERS
251 select M53xx 250 select M53xx
252 select HAVE_CACHE_CB 251 select HAVE_CACHE_CB
253 help 252 help
254 Freescale ColdFire 537x processor su 253 Freescale ColdFire 537x processor support.
255 254
256 config M5407 255 config M5407
257 bool "MCF5407" 256 bool "MCF5407"
258 depends on !MMU 257 depends on !MMU
259 select COLDFIRE_SW_A7 258 select COLDFIRE_SW_A7
260 select COLDFIRE_TIMERS 259 select COLDFIRE_TIMERS
261 select HAVE_CACHE_CB 260 select HAVE_CACHE_CB
262 select HAVE_MBAR 261 select HAVE_MBAR
263 select CPU_NO_EFFICIENT_FFS 262 select CPU_NO_EFFICIENT_FFS
264 help 263 help
265 Motorola ColdFire 5407 processor sup 264 Motorola ColdFire 5407 processor support.
266 265
267 config M547x 266 config M547x
268 bool "MCF547x" 267 bool "MCF547x"
269 select M54xx 268 select M54xx
270 select COLDFIRE_SLTIMERS 269 select COLDFIRE_SLTIMERS
271 select MMU_COLDFIRE if MMU 270 select MMU_COLDFIRE if MMU
272 select FPU if MMU 271 select FPU if MMU
273 select HAVE_CACHE_CB 272 select HAVE_CACHE_CB
274 select HAVE_MBAR 273 select HAVE_MBAR
275 select CPU_NO_EFFICIENT_FFS 274 select CPU_NO_EFFICIENT_FFS
276 help 275 help
277 Freescale ColdFire 5470/5471/5472/54 276 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
278 277
279 config M548x 278 config M548x
280 bool "MCF548x" 279 bool "MCF548x"
281 select COLDFIRE_SLTIMERS 280 select COLDFIRE_SLTIMERS
282 select MMU_COLDFIRE if MMU 281 select MMU_COLDFIRE if MMU
283 select FPU if MMU 282 select FPU if MMU
284 select M54xx 283 select M54xx
285 select HAVE_CACHE_CB 284 select HAVE_CACHE_CB
286 select HAVE_MBAR 285 select HAVE_MBAR
287 select CPU_NO_EFFICIENT_FFS 286 select CPU_NO_EFFICIENT_FFS
288 help 287 help
289 Freescale ColdFire 5480/5481/5482/54 288 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
290 289
291 config M5441x 290 config M5441x
292 bool "MCF5441x" 291 bool "MCF5441x"
293 select COLDFIRE_PIT_TIMER 292 select COLDFIRE_PIT_TIMER
294 select MMU_COLDFIRE if MMU 293 select MMU_COLDFIRE if MMU
295 select HAVE_CACHE_CB 294 select HAVE_CACHE_CB
296 help 295 help
297 Freescale Coldfire 54410/54415/54416 296 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
298 297
299 endchoice 298 endchoice
300 299
301 config M527x 300 config M527x
302 bool 301 bool
303 302
304 config M53xx 303 config M53xx
305 bool 304 bool
306 305
307 config M54xx 306 config M54xx
308 select HAVE_PCI 307 select HAVE_PCI
309 bool 308 bool
310 309
311 config COLDFIRE_PIT_TIMER 310 config COLDFIRE_PIT_TIMER
312 bool 311 bool
313 312
314 config COLDFIRE_TIMERS 313 config COLDFIRE_TIMERS
315 bool 314 bool
316 select LEGACY_TIMER_TICK 315 select LEGACY_TIMER_TICK
317 316
318 config COLDFIRE_SLTIMERS 317 config COLDFIRE_SLTIMERS
319 bool 318 bool
320 select LEGACY_TIMER_TICK 319 select LEGACY_TIMER_TICK
321 320
322 endif # COLDFIRE 321 endif # COLDFIRE
323 322
324 comment "Processor Specific Options" 323 comment "Processor Specific Options"
325 324
326 config M68KFPU_EMU 325 config M68KFPU_EMU
327 bool "Math emulation support" 326 bool "Math emulation support"
328 depends on M68KCLASSIC && FPU 327 depends on M68KCLASSIC && FPU
329 help 328 help
330 At some point in the future, this wi 329 At some point in the future, this will cause floating-point math
331 instructions to be emulated by the k 330 instructions to be emulated by the kernel on machines that lack a
332 floating-point math coprocessor. Th 331 floating-point math coprocessor. Thrill-seekers and chronically
333 sleep-deprived psychotic hacker type 332 sleep-deprived psychotic hacker types can say Y now, everyone else
334 should probably wait a while. 333 should probably wait a while.
335 334
336 config M68KFPU_EMU_EXTRAPREC 335 config M68KFPU_EMU_EXTRAPREC
337 bool "Math emulation extra precision" 336 bool "Math emulation extra precision"
338 depends on M68KFPU_EMU 337 depends on M68KFPU_EMU
339 help 338 help
340 The fpu uses normally a few bit more 339 The fpu uses normally a few bit more during calculations for
341 correct rounding, the emulator can ( 340 correct rounding, the emulator can (often) do the same but this
342 extra calculation can cost quite som 341 extra calculation can cost quite some time, so you can disable
343 it here. The emulator will then "onl 342 it here. The emulator will then "only" calculate with a 64 bit
344 mantissa and round slightly incorrec 343 mantissa and round slightly incorrect, what is more than enough
345 for normal usage. 344 for normal usage.
346 345
347 config M68KFPU_EMU_ONLY 346 config M68KFPU_EMU_ONLY
348 bool "Math emulation only kernel" 347 bool "Math emulation only kernel"
349 depends on M68KFPU_EMU 348 depends on M68KFPU_EMU
350 help 349 help
351 This option prevents any floating-po 350 This option prevents any floating-point instructions from being
352 compiled into the kernel, thereby th 351 compiled into the kernel, thereby the kernel doesn't save any
353 floating point context anymore durin 352 floating point context anymore during task switches, so this
354 kernel will only be usable on machin 353 kernel will only be usable on machines without a floating-point
355 math coprocessor. This makes the ker 354 math coprocessor. This makes the kernel a bit faster as no tests
356 needs to be executed whether a float 355 needs to be executed whether a floating-point instruction in the
357 kernel should be executed or not. 356 kernel should be executed or not.
358 357
359 config ADVANCED 358 config ADVANCED
360 bool "Advanced configuration options" 359 bool "Advanced configuration options"
361 depends on MMU 360 depends on MMU
362 help 361 help
363 This gives you access to some advanc 362 This gives you access to some advanced options for the CPU. The
364 defaults should be fine for most use 363 defaults should be fine for most users, but these options may make
365 it possible for you to improve perfo 364 it possible for you to improve performance somewhat if you know what
366 you are doing. 365 you are doing.
367 366
368 Note that the answer to this questio 367 Note that the answer to this question won't directly affect the
369 kernel: saying N will just cause the 368 kernel: saying N will just cause the configurator to skip all
370 the questions about these options. 369 the questions about these options.
371 370
372 Most users should say N to this ques 371 Most users should say N to this question.
373 372
374 config RMW_INSNS 373 config RMW_INSNS
375 bool "Use read-modify-write instructio 374 bool "Use read-modify-write instructions"
376 depends on ADVANCED && !CPU_HAS_NO_CAS 375 depends on ADVANCED && !CPU_HAS_NO_CAS
377 help 376 help
378 This allows to use certain instructi 377 This allows to use certain instructions that work with indivisible
379 read-modify-write bus cycles. While 378 read-modify-write bus cycles. While this is faster than the
380 workaround of disabling interrupts, 379 workaround of disabling interrupts, it can conflict with DMA
381 ( = direct memory access) on many Am 380 ( = direct memory access) on many Amiga systems, and it is also said
382 to destabilize other machines. It is 381 to destabilize other machines. It is very likely that this will
383 cause serious problems on any Amiga 382 cause serious problems on any Amiga or Atari Medusa if set. The only
384 configuration where it should work a 383 configuration where it should work are 68030-based Ataris, where it
385 apparently improves performance. But 384 apparently improves performance. But you've been warned! Unless you
386 really know what you are doing, say 385 really know what you are doing, say N. Try Y only if you're quite
387 adventurous. 386 adventurous.
388 387
389 config SINGLE_MEMORY_CHUNK 388 config SINGLE_MEMORY_CHUNK
390 bool "Use one physical chunk of memory 389 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
391 depends on MMU 390 depends on MMU
392 default y if SUN3 || MMU_COLDFIRE 391 default y if SUN3 || MMU_COLDFIRE
393 help 392 help
394 Ignore all but the first contiguous 393 Ignore all but the first contiguous chunk of physical memory for VM
395 purposes. This will save a few byte 394 purposes. This will save a few bytes kernel size and may speed up
396 some operations. 395 some operations.
397 When this option os set to N, you ma 396 When this option os set to N, you may want to lower "Maximum zone
398 order" to save memory that could be 397 order" to save memory that could be wasted for unused memory map.
399 Say N if not sure. 398 Say N if not sure.
400 399
401 config ARCH_FORCE_MAX_ORDER 400 config ARCH_FORCE_MAX_ORDER
402 int "Order of maximal physically conti !! 401 int "Maximum zone order" if ADVANCED
403 depends on !SINGLE_MEMORY_CHUNK 402 depends on !SINGLE_MEMORY_CHUNK
404 default "10" !! 403 default "11"
405 help 404 help
406 The kernel page allocator limits the !! 405 The kernel memory allocator divides physically contiguous memory
407 contiguous allocations. The limit is !! 406 blocks into "zones", where each zone is a power of two number of
408 defines the maximal power of two of !! 407 pages. This option selects the largest power of two that the kernel
409 allocated as a single contiguous blo !! 408 keeps in the memory allocator. If you need to allocate very large
410 overriding the default setting when !! 409 blocks of physically contiguous memory, then you may need to
411 large blocks of physically contiguou !! 410 increase this value.
412 411
413 For systems that have holes in their 412 For systems that have holes in their physical address space this
414 value also defines the minimal size 413 value also defines the minimal size of the hole that allows
415 freeing unused memory map. 414 freeing unused memory map.
416 415
417 Don't change if unsure. !! 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.
418 418
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 <<
541 # Coldfire cores that do not have a data cache <<
542 config COLDFIRE_COHERENT_DMA <<
543 bool <<
544 default y <<
545 depends on COLDFIRE <<
546 depends on !HAVE_CACHE_CB && !CACHE_D <<
547 <<
548 config M68K_NONCOHERENT_DMA <<
549 bool <<
550 default y <<
551 depends on HAS_DMA && !COLDFIRE_COHERE <<
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