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