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
>> 56 config MCPU32
>> 57 bool
>> 58 select CPU_HAS_NO_BITFIELDS
>> 59 select CPU_HAS_NO_CAS
>> 60 select CPU_HAS_NO_UNALIGNED
>> 61 select CPU_NO_EFFICIENT_FFS
>> 62 help
>> 63 The Freescale (was then Motorola) CPU32 is a CPU core that is
>> 64 based on the 68020 processor. For the most part it is used in
>> 65 System-On-Chip parts, and does not contain a paging MMU.
>> 66
58 config M68020 67 config M68020
59 bool "68020 support" 68 bool "68020 support"
60 depends on MMU 69 depends on MMU
61 select FPU 70 select FPU
62 select CPU_HAS_ADDRESS_SPACES 71 select CPU_HAS_ADDRESS_SPACES
63 help 72 help
64 If you anticipate running this kerne 73 If you anticipate running this kernel on a computer with a MC68020
65 processor, say Y. Otherwise, say N. 74 processor, say Y. Otherwise, say N. Note that the 68020 requires a
66 68851 MMU (Memory Management Unit) t 75 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
67 Sun 3, which provides its own versio 76 Sun 3, which provides its own version.
68 77
69 config M68030 78 config M68030
70 bool "68030 support" 79 bool "68030 support"
71 depends on MMU && !MMU_SUN3 80 depends on MMU && !MMU_SUN3
72 select FPU 81 select FPU
73 select CPU_HAS_ADDRESS_SPACES 82 select CPU_HAS_ADDRESS_SPACES
74 help 83 help
75 If you anticipate running this kerne 84 If you anticipate running this kernel on a computer with a MC68030
76 processor, say Y. Otherwise, say N. 85 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
77 work, as it does not include an MMU 86 work, as it does not include an MMU (Memory Management Unit).
78 87
79 config M68040 88 config M68040
80 bool "68040 support" 89 bool "68040 support"
81 depends on MMU && !MMU_SUN3 90 depends on MMU && !MMU_SUN3
82 select FPU 91 select FPU
83 select CPU_HAS_ADDRESS_SPACES 92 select CPU_HAS_ADDRESS_SPACES
84 help 93 help
85 If you anticipate running this kerne 94 If you anticipate running this kernel on a computer with a MC68LC040
86 or MC68040 processor, say Y. Otherwi 95 or MC68040 processor, say Y. Otherwise, say N. Note that an
87 MC68EC040 will not work, as it does 96 MC68EC040 will not work, as it does not include an MMU (Memory
88 Management Unit). 97 Management Unit).
89 98
90 config M68060 99 config M68060
91 bool "68060 support" 100 bool "68060 support"
92 depends on MMU && !MMU_SUN3 101 depends on MMU && !MMU_SUN3
93 select FPU 102 select FPU
94 select CPU_HAS_ADDRESS_SPACES 103 select CPU_HAS_ADDRESS_SPACES
95 help 104 help
96 If you anticipate running this kerne 105 If you anticipate running this kernel on a computer with a MC68060
97 processor, say Y. Otherwise, say N. 106 processor, say Y. Otherwise, say N.
98 107
99 config M68328 108 config M68328
100 bool 109 bool
101 depends on !MMU 110 depends on !MMU
>> 111 select LEGACY_TIMER_TICK
102 select M68000 112 select M68000
103 help 113 help
104 Motorola 68328 processor support. 114 Motorola 68328 processor support.
105 115
106 config M68EZ328 116 config M68EZ328
107 bool 117 bool
108 depends on !MMU 118 depends on !MMU
>> 119 select LEGACY_TIMER_TICK
109 select M68000 120 select M68000
110 help 121 help
111 Motorola 68EX328 processor support. 122 Motorola 68EX328 processor support.
112 123
113 config M68VZ328 124 config M68VZ328
114 bool 125 bool
115 depends on !MMU 126 depends on !MMU
>> 127 select LEGACY_TIMER_TICK
116 select M68000 128 select M68000
117 help 129 help
118 Motorola 68VZ328 processor support. 130 Motorola 68VZ328 processor support.
119 131
120 endif # M68KCLASSIC 132 endif # M68KCLASSIC
121 133
122 if COLDFIRE 134 if COLDFIRE
123 135
124 choice 136 choice
125 prompt "ColdFire SoC type" 137 prompt "ColdFire SoC type"
126 default M520x 138 default M520x
127 help 139 help
128 Select the type of ColdFire System-o 140 Select the type of ColdFire System-on-Chip (SoC) that you want
129 to build for. 141 to build for.
130 142
131 config M5206 143 config M5206
132 bool "MCF5206" 144 bool "MCF5206"
133 depends on !MMU 145 depends on !MMU
134 select COLDFIRE_SW_A7 146 select COLDFIRE_SW_A7
135 select COLDFIRE_TIMERS 147 select COLDFIRE_TIMERS
136 select HAVE_MBAR 148 select HAVE_MBAR
137 select CPU_NO_EFFICIENT_FFS 149 select CPU_NO_EFFICIENT_FFS
138 help 150 help
139 Motorola ColdFire 5206 processor sup 151 Motorola ColdFire 5206 processor support.
140 152
141 config M5206e 153 config M5206e
142 bool "MCF5206e" 154 bool "MCF5206e"
143 depends on !MMU 155 depends on !MMU
144 select COLDFIRE_SW_A7 156 select COLDFIRE_SW_A7
145 select COLDFIRE_TIMERS 157 select COLDFIRE_TIMERS
146 select HAVE_MBAR 158 select HAVE_MBAR
147 select CPU_NO_EFFICIENT_FFS 159 select CPU_NO_EFFICIENT_FFS
148 help 160 help
149 Motorola ColdFire 5206e processor su 161 Motorola ColdFire 5206e processor support.
150 162
151 config M520x 163 config M520x
152 bool "MCF520x" 164 bool "MCF520x"
153 depends on !MMU 165 depends on !MMU
154 select COLDFIRE_PIT_TIMER 166 select COLDFIRE_PIT_TIMER
155 select HAVE_CACHE_SPLIT 167 select HAVE_CACHE_SPLIT
156 help 168 help
157 Freescale Coldfire 5207/5208 process !! 169 Freescale Coldfire 5207/5208 processor support.
158 170
159 config M523x 171 config M523x
160 bool "MCF523x" 172 bool "MCF523x"
161 depends on !MMU 173 depends on !MMU
162 select COLDFIRE_PIT_TIMER 174 select COLDFIRE_PIT_TIMER
163 select HAVE_CACHE_SPLIT 175 select HAVE_CACHE_SPLIT
164 select HAVE_IPSBAR 176 select HAVE_IPSBAR
165 help 177 help
166 Freescale Coldfire 5230/1/2/4/5 proc 178 Freescale Coldfire 5230/1/2/4/5 processor support
167 179
168 config M5249 180 config M5249
169 bool "MCF5249" 181 bool "MCF5249"
170 depends on !MMU 182 depends on !MMU
171 select COLDFIRE_SW_A7 183 select COLDFIRE_SW_A7
172 select COLDFIRE_TIMERS 184 select COLDFIRE_TIMERS
173 select HAVE_MBAR 185 select HAVE_MBAR
174 select CPU_NO_EFFICIENT_FFS 186 select CPU_NO_EFFICIENT_FFS
175 help 187 help
176 Motorola ColdFire 5249 processor sup 188 Motorola ColdFire 5249 processor support.
177 189
178 config M525x 190 config M525x
179 bool "MCF525x" 191 bool "MCF525x"
180 depends on !MMU 192 depends on !MMU
181 select COLDFIRE_SW_A7 193 select COLDFIRE_SW_A7
182 select COLDFIRE_TIMERS 194 select COLDFIRE_TIMERS
183 select HAVE_MBAR 195 select HAVE_MBAR
184 select CPU_NO_EFFICIENT_FFS 196 select CPU_NO_EFFICIENT_FFS
185 help 197 help
186 Freescale (Motorola) Coldfire 5251/5 198 Freescale (Motorola) Coldfire 5251/5253 processor support.
187 199
188 config M5271 200 config M5271
189 bool "MCF5271" 201 bool "MCF5271"
190 depends on !MMU 202 depends on !MMU
191 select COLDFIRE_PIT_TIMER 203 select COLDFIRE_PIT_TIMER
192 select M527x 204 select M527x
193 select HAVE_CACHE_SPLIT 205 select HAVE_CACHE_SPLIT
194 select HAVE_IPSBAR 206 select HAVE_IPSBAR
195 help 207 help
196 Freescale (Motorola) ColdFire 5270/5 208 Freescale (Motorola) ColdFire 5270/5271 processor support.
197 209
198 config M5272 210 config M5272
199 bool "MCF5272" 211 bool "MCF5272"
200 depends on !MMU 212 depends on !MMU
201 select COLDFIRE_SW_A7 213 select COLDFIRE_SW_A7
202 select COLDFIRE_TIMERS 214 select COLDFIRE_TIMERS
203 select HAVE_MBAR 215 select HAVE_MBAR
204 select CPU_NO_EFFICIENT_FFS 216 select CPU_NO_EFFICIENT_FFS
205 help 217 help
206 Motorola ColdFire 5272 processor sup 218 Motorola ColdFire 5272 processor support.
207 219
208 config M5275 220 config M5275
209 bool "MCF5275" 221 bool "MCF5275"
210 depends on !MMU 222 depends on !MMU
211 select COLDFIRE_PIT_TIMER 223 select COLDFIRE_PIT_TIMER
212 select M527x 224 select M527x
213 select HAVE_CACHE_SPLIT 225 select HAVE_CACHE_SPLIT
214 select HAVE_IPSBAR 226 select HAVE_IPSBAR
215 help 227 help
216 Freescale (Motorola) ColdFire 5274/5 228 Freescale (Motorola) ColdFire 5274/5275 processor support.
217 229
218 config M528x 230 config M528x
219 bool "MCF528x" 231 bool "MCF528x"
220 depends on !MMU 232 depends on !MMU
221 select COLDFIRE_PIT_TIMER 233 select COLDFIRE_PIT_TIMER
222 select HAVE_CACHE_SPLIT 234 select HAVE_CACHE_SPLIT
223 select HAVE_IPSBAR 235 select HAVE_IPSBAR
224 help 236 help
225 Motorola ColdFire 5280/5282 processo 237 Motorola ColdFire 5280/5282 processor support.
226 238
227 config M5307 239 config M5307
228 bool "MCF5307" 240 bool "MCF5307"
229 depends on !MMU 241 depends on !MMU
230 select COLDFIRE_TIMERS 242 select COLDFIRE_TIMERS
231 select COLDFIRE_SW_A7 243 select COLDFIRE_SW_A7
232 select HAVE_CACHE_CB 244 select HAVE_CACHE_CB
233 select HAVE_MBAR 245 select HAVE_MBAR
234 select CPU_NO_EFFICIENT_FFS 246 select CPU_NO_EFFICIENT_FFS
235 help 247 help
236 Motorola ColdFire 5307 processor sup 248 Motorola ColdFire 5307 processor support.
237 249
238 config M532x 250 config M532x
239 bool "MCF532x" 251 bool "MCF532x"
240 depends on !MMU 252 depends on !MMU
241 select COLDFIRE_TIMERS 253 select COLDFIRE_TIMERS
242 select M53xx 254 select M53xx
243 select HAVE_CACHE_CB 255 select HAVE_CACHE_CB
244 help 256 help
245 Freescale (Motorola) ColdFire 532x p 257 Freescale (Motorola) ColdFire 532x processor support.
246 258
247 config M537x 259 config M537x
248 bool "MCF537x" 260 bool "MCF537x"
249 depends on !MMU 261 depends on !MMU
250 select COLDFIRE_TIMERS 262 select COLDFIRE_TIMERS
251 select M53xx 263 select M53xx
252 select HAVE_CACHE_CB 264 select HAVE_CACHE_CB
253 help 265 help
254 Freescale ColdFire 537x processor su 266 Freescale ColdFire 537x processor support.
255 267
256 config M5407 268 config M5407
257 bool "MCF5407" 269 bool "MCF5407"
258 depends on !MMU 270 depends on !MMU
259 select COLDFIRE_SW_A7 271 select COLDFIRE_SW_A7
260 select COLDFIRE_TIMERS 272 select COLDFIRE_TIMERS
261 select HAVE_CACHE_CB 273 select HAVE_CACHE_CB
262 select HAVE_MBAR 274 select HAVE_MBAR
263 select CPU_NO_EFFICIENT_FFS 275 select CPU_NO_EFFICIENT_FFS
264 help 276 help
265 Motorola ColdFire 5407 processor sup 277 Motorola ColdFire 5407 processor support.
266 278
267 config M547x 279 config M547x
268 bool "MCF547x" 280 bool "MCF547x"
269 select M54xx 281 select M54xx
270 select COLDFIRE_SLTIMERS 282 select COLDFIRE_SLTIMERS
271 select MMU_COLDFIRE if MMU 283 select MMU_COLDFIRE if MMU
272 select FPU if MMU 284 select FPU if MMU
273 select HAVE_CACHE_CB 285 select HAVE_CACHE_CB
274 select HAVE_MBAR 286 select HAVE_MBAR
275 select CPU_NO_EFFICIENT_FFS 287 select CPU_NO_EFFICIENT_FFS
276 help 288 help
277 Freescale ColdFire 5470/5471/5472/54 289 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
278 290
279 config M548x 291 config M548x
280 bool "MCF548x" 292 bool "MCF548x"
281 select COLDFIRE_SLTIMERS 293 select COLDFIRE_SLTIMERS
282 select MMU_COLDFIRE if MMU 294 select MMU_COLDFIRE if MMU
283 select FPU if MMU 295 select FPU if MMU
284 select M54xx 296 select M54xx
285 select HAVE_CACHE_CB 297 select HAVE_CACHE_CB
286 select HAVE_MBAR 298 select HAVE_MBAR
287 select CPU_NO_EFFICIENT_FFS 299 select CPU_NO_EFFICIENT_FFS
288 help 300 help
289 Freescale ColdFire 5480/5481/5482/54 301 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
290 302
291 config M5441x 303 config M5441x
292 bool "MCF5441x" 304 bool "MCF5441x"
293 select COLDFIRE_PIT_TIMER 305 select COLDFIRE_PIT_TIMER
294 select MMU_COLDFIRE if MMU 306 select MMU_COLDFIRE if MMU
295 select HAVE_CACHE_CB 307 select HAVE_CACHE_CB
296 help 308 help
297 Freescale Coldfire 54410/54415/54416 309 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
298 310
299 endchoice 311 endchoice
300 312
301 config M527x 313 config M527x
302 bool 314 bool
303 315
304 config M53xx 316 config M53xx
305 bool 317 bool
306 318
307 config M54xx 319 config M54xx
308 select HAVE_PCI 320 select HAVE_PCI
309 bool 321 bool
310 322
311 config COLDFIRE_PIT_TIMER 323 config COLDFIRE_PIT_TIMER
312 bool 324 bool
313 325
314 config COLDFIRE_TIMERS 326 config COLDFIRE_TIMERS
315 bool 327 bool
316 select LEGACY_TIMER_TICK 328 select LEGACY_TIMER_TICK
317 329
318 config COLDFIRE_SLTIMERS 330 config COLDFIRE_SLTIMERS
319 bool 331 bool
320 select LEGACY_TIMER_TICK 332 select LEGACY_TIMER_TICK
321 333
322 endif # COLDFIRE 334 endif # COLDFIRE
323 335
>> 336
324 comment "Processor Specific Options" 337 comment "Processor Specific Options"
325 338
326 config M68KFPU_EMU 339 config M68KFPU_EMU
327 bool "Math emulation support" 340 bool "Math emulation support"
328 depends on M68KCLASSIC && FPU !! 341 depends on MMU
329 help 342 help
330 At some point in the future, this wi 343 At some point in the future, this will cause floating-point math
331 instructions to be emulated by the k 344 instructions to be emulated by the kernel on machines that lack a
332 floating-point math coprocessor. Th 345 floating-point math coprocessor. Thrill-seekers and chronically
333 sleep-deprived psychotic hacker type 346 sleep-deprived psychotic hacker types can say Y now, everyone else
334 should probably wait a while. 347 should probably wait a while.
335 348
336 config M68KFPU_EMU_EXTRAPREC 349 config M68KFPU_EMU_EXTRAPREC
337 bool "Math emulation extra precision" 350 bool "Math emulation extra precision"
338 depends on M68KFPU_EMU 351 depends on M68KFPU_EMU
339 help 352 help
340 The fpu uses normally a few bit more 353 The fpu uses normally a few bit more during calculations for
341 correct rounding, the emulator can ( 354 correct rounding, the emulator can (often) do the same but this
342 extra calculation can cost quite som 355 extra calculation can cost quite some time, so you can disable
343 it here. The emulator will then "onl 356 it here. The emulator will then "only" calculate with a 64 bit
344 mantissa and round slightly incorrec 357 mantissa and round slightly incorrect, what is more than enough
345 for normal usage. 358 for normal usage.
346 359
347 config M68KFPU_EMU_ONLY 360 config M68KFPU_EMU_ONLY
348 bool "Math emulation only kernel" 361 bool "Math emulation only kernel"
349 depends on M68KFPU_EMU 362 depends on M68KFPU_EMU
350 help 363 help
351 This option prevents any floating-po 364 This option prevents any floating-point instructions from being
352 compiled into the kernel, thereby th 365 compiled into the kernel, thereby the kernel doesn't save any
353 floating point context anymore durin 366 floating point context anymore during task switches, so this
354 kernel will only be usable on machin 367 kernel will only be usable on machines without a floating-point
355 math coprocessor. This makes the ker 368 math coprocessor. This makes the kernel a bit faster as no tests
356 needs to be executed whether a float 369 needs to be executed whether a floating-point instruction in the
357 kernel should be executed or not. 370 kernel should be executed or not.
358 371
359 config ADVANCED 372 config ADVANCED
360 bool "Advanced configuration options" 373 bool "Advanced configuration options"
361 depends on MMU 374 depends on MMU
362 help 375 help
363 This gives you access to some advanc 376 This gives you access to some advanced options for the CPU. The
364 defaults should be fine for most use 377 defaults should be fine for most users, but these options may make
365 it possible for you to improve perfo 378 it possible for you to improve performance somewhat if you know what
366 you are doing. 379 you are doing.
367 380
368 Note that the answer to this questio 381 Note that the answer to this question won't directly affect the
369 kernel: saying N will just cause the 382 kernel: saying N will just cause the configurator to skip all
370 the questions about these options. 383 the questions about these options.
371 384
372 Most users should say N to this ques 385 Most users should say N to this question.
373 386
374 config RMW_INSNS 387 config RMW_INSNS
375 bool "Use read-modify-write instructio 388 bool "Use read-modify-write instructions"
376 depends on ADVANCED && !CPU_HAS_NO_CAS 389 depends on ADVANCED && !CPU_HAS_NO_CAS
377 help 390 help
378 This allows to use certain instructi 391 This allows to use certain instructions that work with indivisible
379 read-modify-write bus cycles. While 392 read-modify-write bus cycles. While this is faster than the
380 workaround of disabling interrupts, 393 workaround of disabling interrupts, it can conflict with DMA
381 ( = direct memory access) on many Am 394 ( = direct memory access) on many Amiga systems, and it is also said
382 to destabilize other machines. It is 395 to destabilize other machines. It is very likely that this will
383 cause serious problems on any Amiga 396 cause serious problems on any Amiga or Atari Medusa if set. The only
384 configuration where it should work a 397 configuration where it should work are 68030-based Ataris, where it
385 apparently improves performance. But 398 apparently improves performance. But you've been warned! Unless you
386 really know what you are doing, say 399 really know what you are doing, say N. Try Y only if you're quite
387 adventurous. 400 adventurous.
388 401
389 config SINGLE_MEMORY_CHUNK 402 config SINGLE_MEMORY_CHUNK
390 bool "Use one physical chunk of memory 403 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
391 depends on MMU 404 depends on MMU
392 default y if SUN3 || MMU_COLDFIRE 405 default y if SUN3 || MMU_COLDFIRE
393 help 406 help
394 Ignore all but the first contiguous 407 Ignore all but the first contiguous chunk of physical memory for VM
395 purposes. This will save a few byte 408 purposes. This will save a few bytes kernel size and may speed up
396 some operations. 409 some operations.
397 When this option os set to N, you ma 410 When this option os set to N, you may want to lower "Maximum zone
398 order" to save memory that could be 411 order" to save memory that could be wasted for unused memory map.
399 Say N if not sure. 412 Say N if not sure.
400 413
401 config ARCH_FORCE_MAX_ORDER !! 414 config FORCE_MAX_ZONEORDER
402 int "Order of maximal physically conti !! 415 int "Maximum zone order" if ADVANCED
403 depends on !SINGLE_MEMORY_CHUNK 416 depends on !SINGLE_MEMORY_CHUNK
404 default "10" !! 417 default "11"
405 help 418 help
406 The kernel page allocator limits the !! 419 The kernel memory allocator divides physically contiguous memory
407 contiguous allocations. The limit is !! 420 blocks into "zones", where each zone is a power of two number of
408 defines the maximal power of two of !! 421 pages. This option selects the largest power of two that the kernel
409 allocated as a single contiguous blo !! 422 keeps in the memory allocator. If you need to allocate very large
410 overriding the default setting when !! 423 blocks of physically contiguous memory, then you may need to
411 large blocks of physically contiguou !! 424 increase this value.
412 425
413 For systems that have holes in their 426 For systems that have holes in their physical address space this
414 value also defines the minimal size 427 value also defines the minimal size of the hole that allows
415 freeing unused memory map. 428 freeing unused memory map.
416 429
417 Don't change if unsure. !! 430 This config option is actually maximum order plus one. For example,
>> 431 a value of 11 means that the largest free memory block is 2^10 pages.
418 432
419 config 060_WRITETHROUGH 433 config 060_WRITETHROUGH
420 bool "Use write-through caching for 68 434 bool "Use write-through caching for 68060 supervisor accesses"
421 depends on ADVANCED && M68060 435 depends on ADVANCED && M68060
422 help 436 help
423 The 68060 generally uses copyback ca 437 The 68060 generally uses copyback caching of recently accessed data.
424 Copyback caching means that memory w 438 Copyback caching means that memory writes will be held in an on-chip
425 cache and only written back to memor 439 cache and only written back to memory some time later. Saying Y
426 here will force supervisor (kernel) 440 here will force supervisor (kernel) accesses to use writethrough
427 caching. Writethrough caching means 441 caching. Writethrough caching means that data is written to memory
428 straight away, so that cache and mem 442 straight away, so that cache and memory data always agree.
429 Writethrough caching is less efficie 443 Writethrough caching is less efficient, but is needed for some
430 drivers on 68060 based systems where 444 drivers on 68060 based systems where the 68060 bus snooping signal
431 is hardwired on. The 53c710 SCSI dr 445 is hardwired on. The 53c710 SCSI driver is known to suffer from
432 this problem. 446 this problem.
433 447
434 config M68K_L2_CACHE 448 config M68K_L2_CACHE
435 bool 449 bool
436 depends on MAC 450 depends on MAC
437 default y 451 default y
438 452
439 config CPU_HAS_NO_BITFIELDS 453 config CPU_HAS_NO_BITFIELDS
440 bool 454 bool
441 455
442 config CPU_HAS_NO_CAS 456 config CPU_HAS_NO_CAS
443 bool 457 bool
444 458
445 config CPU_HAS_NO_MULDIV64 459 config CPU_HAS_NO_MULDIV64
446 bool 460 bool
447 461
448 config CPU_HAS_NO_UNALIGNED 462 config CPU_HAS_NO_UNALIGNED
449 bool 463 bool
450 464
451 config CPU_HAS_ADDRESS_SPACES 465 config CPU_HAS_ADDRESS_SPACES
452 bool 466 bool
453 select ALTERNATE_USER_ADDRESS_SPACE <<
454 467
455 config FPU 468 config FPU
456 bool 469 bool
457 470
458 config COLDFIRE_SW_A7 471 config COLDFIRE_SW_A7
459 bool 472 bool
460 473
461 config HAVE_CACHE_SPLIT 474 config HAVE_CACHE_SPLIT
462 bool 475 bool
463 476
464 config HAVE_CACHE_CB 477 config HAVE_CACHE_CB
465 bool 478 bool
466 479
467 config HAVE_MBAR 480 config HAVE_MBAR
468 bool 481 bool
469 482
470 config HAVE_IPSBAR 483 config HAVE_IPSBAR
471 bool 484 bool
472 485
473 config CLOCK_FREQ 486 config CLOCK_FREQ
474 int "Set the core clock frequency" 487 int "Set the core clock frequency"
475 default "25000000" if M5206 488 default "25000000" if M5206
476 default "54000000" if M5206e 489 default "54000000" if M5206e
477 default "166666666" if M520x 490 default "166666666" if M520x
478 default "140000000" if M5249 491 default "140000000" if M5249
479 default "150000000" if M527x || M523x 492 default "150000000" if M527x || M523x
480 default "90000000" if M5307 493 default "90000000" if M5307
481 default "50000000" if M5407 494 default "50000000" if M5407
482 default "266000000" if M54xx 495 default "266000000" if M54xx
483 default "66666666" 496 default "66666666"
484 depends on COLDFIRE 497 depends on COLDFIRE
485 help 498 help
486 Define the CPU clock frequency in us 499 Define the CPU clock frequency in use. This is the core clock
487 frequency, it may or may not be the 500 frequency, it may or may not be the same as the external clock
488 crystal fitted to your board. Some p 501 crystal fitted to your board. Some processors have an internal
489 PLL and can have their frequency pro 502 PLL and can have their frequency programmed at run time, others
490 use internal dividers. In general th 503 use internal dividers. In general the kernel won't setup a PLL
491 if it is fitted (there are some exce 504 if it is fitted (there are some exceptions). This value will be
492 specific to the exact CPU that you a 505 specific to the exact CPU that you are using.
493 506
494 config OLDMASK 507 config OLDMASK
495 bool "Old mask 5307 (1H55J) silicon" 508 bool "Old mask 5307 (1H55J) silicon"
496 depends on M5307 509 depends on M5307
497 help 510 help
498 Build support for the older revision 511 Build support for the older revision ColdFire 5307 silicon.
499 Specifically this is the 1H55J mask 512 Specifically this is the 1H55J mask revision.
500 513
501 if HAVE_CACHE_SPLIT 514 if HAVE_CACHE_SPLIT
502 choice 515 choice
503 prompt "Split Cache Configuration" 516 prompt "Split Cache Configuration"
504 default CACHE_I 517 default CACHE_I
505 518
506 config CACHE_I 519 config CACHE_I
507 bool "Instruction" 520 bool "Instruction"
508 help 521 help
509 Use all of the ColdFire CPU cache me 522 Use all of the ColdFire CPU cache memory as an instruction cache.
510 523
511 config CACHE_D 524 config CACHE_D
512 bool "Data" 525 bool "Data"
513 help 526 help
514 Use all of the ColdFire CPU cache me 527 Use all of the ColdFire CPU cache memory as a data cache.
515 528
516 config CACHE_BOTH 529 config CACHE_BOTH
517 bool "Both" 530 bool "Both"
518 help 531 help
519 Split the ColdFire CPU cache, and us 532 Split the ColdFire CPU cache, and use half as an instruction cache
520 and half as a data cache. 533 and half as a data cache.
521 endchoice 534 endchoice
522 endif # HAVE_CACHE_SPLIT !! 535 endif
523 536
524 if HAVE_CACHE_CB 537 if HAVE_CACHE_CB
525 choice 538 choice
526 prompt "Data cache mode" 539 prompt "Data cache mode"
527 default CACHE_WRITETHRU 540 default CACHE_WRITETHRU
528 541
529 config CACHE_WRITETHRU 542 config CACHE_WRITETHRU
530 bool "Write-through" 543 bool "Write-through"
531 help 544 help
532 The ColdFire CPU cache is set into W 545 The ColdFire CPU cache is set into Write-through mode.
533 546
534 config CACHE_COPYBACK 547 config CACHE_COPYBACK
535 bool "Copy-back" 548 bool "Copy-back"
536 help 549 help
537 The ColdFire CPU cache is set into C 550 The ColdFire CPU cache is set into Copy-back mode.
538 endchoice 551 endchoice
539 endif # HAVE_CACHE_CB !! 552 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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