Root/arch/m68k/Kconfig.cpu

Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago.
By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant.
1comment "Processor Type"
2
3choice
4    prompt "CPU family support"
5    default M68KCLASSIC if MMU
6    default COLDFIRE if !MMU
7    help
8      The Freescale (was Motorola) M68K family of processors implements
9      the full 68000 processor instruction set.
10      The Freescale ColdFire family of processors is a modern derivitive
11      of the 68000 processor family. They are mainly targeted at embedded
12      applications, and are all System-On-Chip (SOC) devices, as opposed
13      to stand alone CPUs. They implement a subset of the original 68000
14      processor instruction set.
15      If you anticipate running this kernel on a computer with a classic
16      MC68xxx processor, select M68KCLASSIC.
17      If you anticipate running this kernel on a computer with a ColdFire
18      processor, select COLDFIRE.
19
20config M68KCLASSIC
21    bool "Classic M68K CPU family support"
22
23config COLDFIRE
24    bool "Coldfire CPU family support"
25    select GENERIC_GPIO
26    select ARCH_REQUIRE_GPIOLIB
27    select CPU_HAS_NO_BITFIELDS
28    select CPU_HAS_NO_MULDIV64
29    select GENERIC_CSUM
30
31endchoice
32
33if M68KCLASSIC
34
35config M68000
36    bool
37    select CPU_HAS_NO_BITFIELDS
38    select CPU_HAS_NO_MULDIV64
39    select GENERIC_CSUM
40    help
41      The Freescale (was Motorola) 68000 CPU is the first generation of
42      the well known M68K family of processors. The CPU core as well as
43      being available as a stand alone CPU was also used in many
44      System-On-Chip devices (eg 68328, 68302, etc). It does not contain
45      a paging MMU.
46
47config MCPU32
48    bool
49    select CPU_HAS_NO_BITFIELDS
50    help
51      The Freescale (was then Motorola) CPU32 is a CPU core that is
52      based on the 68020 processor. For the most part it is used in
53      System-On-Chip parts, and does not contain a paging MMU.
54
55config M68020
56    bool "68020 support"
57    depends on MMU
58    select GENERIC_ATOMIC64
59    select CPU_HAS_ADDRESS_SPACES
60    help
61      If you anticipate running this kernel on a computer with a MC68020
62      processor, say Y. Otherwise, say N. Note that the 68020 requires a
63      68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
64      Sun 3, which provides its own version.
65
66config M68030
67    bool "68030 support"
68    depends on MMU && !MMU_SUN3
69    select GENERIC_ATOMIC64
70    select CPU_HAS_ADDRESS_SPACES
71    help
72      If you anticipate running this kernel on a computer with a MC68030
73      processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
74      work, as it does not include an MMU (Memory Management Unit).
75
76config M68040
77    bool "68040 support"
78    depends on MMU && !MMU_SUN3
79    select GENERIC_ATOMIC64
80    select CPU_HAS_ADDRESS_SPACES
81    help
82      If you anticipate running this kernel on a computer with a MC68LC040
83      or MC68040 processor, say Y. Otherwise, say N. Note that an
84      MC68EC040 will not work, as it does not include an MMU (Memory
85      Management Unit).
86
87config M68060
88    bool "68060 support"
89    depends on MMU && !MMU_SUN3
90    select GENERIC_ATOMIC64
91    select CPU_HAS_ADDRESS_SPACES
92    help
93      If you anticipate running this kernel on a computer with a MC68060
94      processor, say Y. Otherwise, say N.
95
96config M68328
97    bool "MC68328"
98    depends on !MMU
99    select M68000
100    help
101      Motorola 68328 processor support.
102
103config M68EZ328
104    bool "MC68EZ328"
105    depends on !MMU
106    select M68000
107    help
108      Motorola 68EX328 processor support.
109
110config M68VZ328
111    bool "MC68VZ328"
112    depends on !MMU
113    select M68000
114    help
115      Motorola 68VZ328 processor support.
116
117config M68360
118    bool "MC68360"
119    depends on !MMU
120    select MCPU32
121    help
122      Motorola 68360 processor support.
123
124endif # M68KCLASSIC
125
126if COLDFIRE
127
128config M5206
129    bool "MCF5206"
130    depends on !MMU
131    select COLDFIRE_SW_A7
132    select HAVE_MBAR
133    help
134      Motorola ColdFire 5206 processor support.
135
136config M5206e
137    bool "MCF5206e"
138    depends on !MMU
139    select COLDFIRE_SW_A7
140    select HAVE_MBAR
141    help
142      Motorola ColdFire 5206e processor support.
143
144config M520x
145    bool "MCF520x"
146    depends on !MMU
147    select GENERIC_CLOCKEVENTS
148    select HAVE_CACHE_SPLIT
149    help
150       Freescale Coldfire 5207/5208 processor support.
151
152config M523x
153    bool "MCF523x"
154    depends on !MMU
155    select GENERIC_CLOCKEVENTS
156    select HAVE_CACHE_SPLIT
157    select HAVE_IPSBAR
158    help
159      Freescale Coldfire 5230/1/2/4/5 processor support
160
161config M5249
162    bool "MCF5249"
163    depends on !MMU
164    select COLDFIRE_SW_A7
165    select HAVE_MBAR
166    help
167      Motorola ColdFire 5249 processor support.
168
169config M527x
170    bool
171
172config M5271
173    bool "MCF5271"
174    depends on !MMU
175    select M527x
176    select HAVE_CACHE_SPLIT
177    select HAVE_IPSBAR
178    select GENERIC_CLOCKEVENTS
179    help
180      Freescale (Motorola) ColdFire 5270/5271 processor support.
181
182config M5272
183    bool "MCF5272"
184    depends on !MMU
185    select COLDFIRE_SW_A7
186    select HAVE_MBAR
187    help
188      Motorola ColdFire 5272 processor support.
189
190config M5275
191    bool "MCF5275"
192    depends on !MMU
193    select M527x
194    select HAVE_CACHE_SPLIT
195    select HAVE_IPSBAR
196    select GENERIC_CLOCKEVENTS
197    help
198      Freescale (Motorola) ColdFire 5274/5275 processor support.
199
200config M528x
201    bool "MCF528x"
202    depends on !MMU
203    select GENERIC_CLOCKEVENTS
204    select HAVE_CACHE_SPLIT
205    select HAVE_IPSBAR
206    help
207      Motorola ColdFire 5280/5282 processor support.
208
209config M5307
210    bool "MCF5307"
211    depends on !MMU
212    select COLDFIRE_SW_A7
213    select HAVE_CACHE_CB
214    select HAVE_MBAR
215    help
216      Motorola ColdFire 5307 processor support.
217
218config M532x
219    bool "MCF532x"
220    depends on !MMU
221    select HAVE_CACHE_CB
222    help
223      Freescale (Motorola) ColdFire 532x processor support.
224
225config M5407
226    bool "MCF5407"
227    depends on !MMU
228    select COLDFIRE_SW_A7
229    select HAVE_CACHE_CB
230    select HAVE_MBAR
231    help
232      Motorola ColdFire 5407 processor support.
233
234config M54xx
235    bool
236
237config M547x
238    bool "MCF547x"
239    select M54xx
240    select MMU_COLDFIRE if MMU
241    select HAVE_CACHE_CB
242    select HAVE_MBAR
243    help
244      Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
245
246config M548x
247    bool "MCF548x"
248    select MMU_COLDFIRE if MMU
249    select M54xx
250    select HAVE_CACHE_CB
251    select HAVE_MBAR
252    help
253      Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
254
255endif # COLDFIRE
256
257
258comment "Processor Specific Options"
259
260config M68KFPU_EMU
261    bool "Math emulation support (EXPERIMENTAL)"
262    depends on MMU
263    depends on EXPERIMENTAL
264    help
265      At some point in the future, this will cause floating-point math
266      instructions to be emulated by the kernel on machines that lack a
267      floating-point math coprocessor. Thrill-seekers and chronically
268      sleep-deprived psychotic hacker types can say Y now, everyone else
269      should probably wait a while.
270
271config M68KFPU_EMU_EXTRAPREC
272    bool "Math emulation extra precision"
273    depends on M68KFPU_EMU
274    help
275      The fpu uses normally a few bit more during calculations for
276      correct rounding, the emulator can (often) do the same but this
277      extra calculation can cost quite some time, so you can disable
278      it here. The emulator will then "only" calculate with a 64 bit
279      mantissa and round slightly incorrect, what is more than enough
280      for normal usage.
281
282config M68KFPU_EMU_ONLY
283    bool "Math emulation only kernel"
284    depends on M68KFPU_EMU
285    help
286      This option prevents any floating-point instructions from being
287      compiled into the kernel, thereby the kernel doesn't save any
288      floating point context anymore during task switches, so this
289      kernel will only be usable on machines without a floating-point
290      math coprocessor. This makes the kernel a bit faster as no tests
291      needs to be executed whether a floating-point instruction in the
292      kernel should be executed or not.
293
294config ADVANCED
295    bool "Advanced configuration options"
296    depends on MMU
297    ---help---
298      This gives you access to some advanced options for the CPU. The
299      defaults should be fine for most users, but these options may make
300      it possible for you to improve performance somewhat if you know what
301      you are doing.
302
303      Note that the answer to this question won't directly affect the
304      kernel: saying N will just cause the configurator to skip all
305      the questions about these options.
306
307      Most users should say N to this question.
308
309config RMW_INSNS
310    bool "Use read-modify-write instructions"
311    depends on ADVANCED
312    ---help---
313      This allows to use certain instructions that work with indivisible
314      read-modify-write bus cycles. While this is faster than the
315      workaround of disabling interrupts, it can conflict with DMA
316      ( = direct memory access) on many Amiga systems, and it is also said
317      to destabilize other machines. It is very likely that this will
318      cause serious problems on any Amiga or Atari Medusa if set. The only
319      configuration where it should work are 68030-based Ataris, where it
320      apparently improves performance. But you've been warned! Unless you
321      really know what you are doing, say N. Try Y only if you're quite
322      adventurous.
323
324config SINGLE_MEMORY_CHUNK
325    bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
326    depends on MMU
327    default y if SUN3
328    select NEED_MULTIPLE_NODES
329    help
330      Ignore all but the first contiguous chunk of physical memory for VM
331      purposes. This will save a few bytes kernel size and may speed up
332      some operations. Say N if not sure.
333
334config ARCH_DISCONTIGMEM_ENABLE
335    def_bool MMU && !SINGLE_MEMORY_CHUNK
336
337config 060_WRITETHROUGH
338    bool "Use write-through caching for 68060 supervisor accesses"
339    depends on ADVANCED && M68060
340    ---help---
341      The 68060 generally uses copyback caching of recently accessed data.
342      Copyback caching means that memory writes will be held in an on-chip
343      cache and only written back to memory some time later. Saying Y
344      here will force supervisor (kernel) accesses to use writethrough
345      caching. Writethrough caching means that data is written to memory
346      straight away, so that cache and memory data always agree.
347      Writethrough caching is less efficient, but is needed for some
348      drivers on 68060 based systems where the 68060 bus snooping signal
349      is hardwired on. The 53c710 SCSI driver is known to suffer from
350      this problem.
351
352config M68K_L2_CACHE
353    bool
354    depends on MAC
355    default y
356
357config NODES_SHIFT
358    int
359    default "3"
360    depends on !SINGLE_MEMORY_CHUNK
361
362config FPU
363    bool
364
365config COLDFIRE_SW_A7
366    bool
367
368config HAVE_CACHE_SPLIT
369    bool
370
371config HAVE_CACHE_CB
372    bool
373
374config HAVE_MBAR
375    bool
376
377config HAVE_IPSBAR
378    bool
379
380config CLOCK_SET
381    bool "Enable setting the CPU clock frequency"
382    depends on COLDFIRE
383    default n
384    help
385      On some CPU's you do not need to know what the core CPU clock
386      frequency is. On these you can disable clock setting. On some
387      traditional 68K parts, and on all ColdFire parts you need to set
388      the appropriate CPU clock frequency. On these devices many of the
389      onboard peripherals derive their timing from the master CPU clock
390      frequency.
391
392config CLOCK_FREQ
393    int "Set the core clock frequency"
394    default "66666666"
395    depends on CLOCK_SET
396    help
397      Define the CPU clock frequency in use. This is the core clock
398      frequency, it may or may not be the same as the external clock
399      crystal fitted to your board. Some processors have an internal
400      PLL and can have their frequency programmed at run time, others
401      use internal dividers. In general the kernel won't setup a PLL
402      if it is fitted (there are some exceptions). This value will be
403      specific to the exact CPU that you are using.
404
405config OLDMASK
406    bool "Old mask 5307 (1H55J) silicon"
407    depends on M5307
408    help
409      Build support for the older revision ColdFire 5307 silicon.
410      Specifically this is the 1H55J mask revision.
411
412if HAVE_CACHE_SPLIT
413choice
414    prompt "Split Cache Configuration"
415    default CACHE_I
416
417config CACHE_I
418    bool "Instruction"
419    help
420      Use all of the ColdFire CPU cache memory as an instruction cache.
421
422config CACHE_D
423    bool "Data"
424    help
425      Use all of the ColdFire CPU cache memory as a data cache.
426
427config CACHE_BOTH
428    bool "Both"
429    help
430      Split the ColdFire CPU cache, and use half as an instruction cache
431      and half as a data cache.
432endchoice
433endif
434
435if HAVE_CACHE_CB
436choice
437    prompt "Data cache mode"
438    default CACHE_WRITETHRU
439
440config CACHE_WRITETHRU
441    bool "Write-through"
442    help
443      The ColdFire CPU cache is set into Write-through mode.
444
445config CACHE_COPYBACK
446    bool "Copy-back"
447    help
448      The ColdFire CPU cache is set into Copy-back mode.
449endchoice
450endif
451
452

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