1 # SPDX-License-Identifier: GPL-2.0
2 comment "Processor Type"
5 prompt "CPU/machine family support"
6 default M68KCLASSIC if MMU
7 default COLDFIRE if !MMU
9 The Freescale (was Motorola) M68K family of processors implements
10 the full 68000 processor instruction set.
11 The Freescale ColdFire family of processors is a modern derivative
12 of the 68000 processor family. They are mainly targeted at embedded
13 applications, and are all System-On-Chip (SOC) devices, as opposed
14 to stand alone CPUs. They implement a subset of the original 68000
15 processor instruction set.
16 If you anticipate running this kernel on a computer with a classic
17 MC68xxx processor, select M68KCLASSIC.
18 If you anticipate running this kernel on a computer with a ColdFire
19 processor, select COLDFIRE.
22 bool "Classic M68K CPU/machine family support"
23 select HAVE_ARCH_PFN_VALID
24 select M68020 if MMU && !(M68030 || M68040 || M68060)
27 bool "Coldfire CPU family support"
28 select CPU_HAS_NO_BITFIELDS
30 select CPU_HAS_NO_MULDIV64
33 select HAVE_LEGACY_CLK
34 select HAVE_PAGE_SIZE_8KB if !MMU
37 bool "Sun3 machine support"
39 select HAVE_ARCH_PFN_VALID
40 select LEGACY_TIMER_TICK
44 This option enables support for the Sun 3 series of workstations
45 (3/50, 3/60, 3/1xx, 3/2xx systems). These use a classic 68020 CPU
46 but the custom memory management unit makes them incompatible with
47 all other classic m68k machines, including Sun 3x.
52 def_bool M68KCLASSIC && !MMU
53 select CPU_HAS_NO_BITFIELDS
55 select CPU_HAS_NO_MULDIV64
56 select CPU_HAS_NO_UNALIGNED
58 select CPU_NO_EFFICIENT_FFS
60 select HAVE_PAGE_SIZE_4KB
61 select LEGACY_TIMER_TICK
63 The Freescale (was Motorola) 68000 CPU is the first generation of
64 the well known M68K family of processors. The CPU core as well as
65 being available as a stand alone CPU was also used in many
66 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
70 bool "68020 support" if M68KCLASSIC
73 select CPU_HAS_ADDRESS_SPACES
75 If you anticipate running this kernel on a computer with a MC68020
76 processor, say Y. Otherwise, say N. Note that the 68020 requires a
77 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
78 Sun 3, which provides its own version.
85 select CPU_HAS_ADDRESS_SPACES
87 If you anticipate running this kernel on a computer with a MC68030
88 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
89 work, as it does not include an MMU (Memory Management Unit).
94 select CPU_HAS_ADDRESS_SPACES
96 If you anticipate running this kernel on a computer with a MC68LC040
97 or MC68040 processor, say Y. Otherwise, say N. Note that an
98 MC68EC040 will not work, as it does not include an MMU (Memory
104 select CPU_HAS_ADDRESS_SPACES
106 If you anticipate running this kernel on a computer with a MC68060
107 processor, say Y. Otherwise, say N.
116 Motorola 68328 processor support.
123 Motorola 68EX328 processor support.
130 Motorola 68VZ328 processor support.
135 prompt "ColdFire SoC type"
138 Select the type of ColdFire System-on-Chip (SoC) that you want
144 select COLDFIRE_SW_A7
145 select COLDFIRE_TIMERS
147 select CPU_NO_EFFICIENT_FFS
149 Motorola ColdFire 5206 processor support.
154 select COLDFIRE_SW_A7
155 select COLDFIRE_TIMERS
157 select CPU_NO_EFFICIENT_FFS
159 Motorola ColdFire 5206e processor support.
164 select COLDFIRE_PIT_TIMER
165 select HAVE_CACHE_SPLIT
167 Freescale Coldfire 5207/5208 processor support.
172 select COLDFIRE_PIT_TIMER
173 select HAVE_CACHE_SPLIT
176 Freescale Coldfire 5230/1/2/4/5 processor support
181 select COLDFIRE_SW_A7
182 select COLDFIRE_TIMERS
184 select CPU_NO_EFFICIENT_FFS
186 Motorola ColdFire 5249 processor support.
191 select COLDFIRE_SW_A7
192 select COLDFIRE_TIMERS
194 select CPU_NO_EFFICIENT_FFS
196 Freescale (Motorola) Coldfire 5251/5253 processor support.
201 select COLDFIRE_PIT_TIMER
203 select HAVE_CACHE_SPLIT
206 Freescale (Motorola) ColdFire 5270/5271 processor support.
211 select COLDFIRE_SW_A7
212 select COLDFIRE_TIMERS
214 select CPU_NO_EFFICIENT_FFS
216 Motorola ColdFire 5272 processor support.
221 select COLDFIRE_PIT_TIMER
223 select HAVE_CACHE_SPLIT
226 Freescale (Motorola) ColdFire 5274/5275 processor support.
231 select COLDFIRE_PIT_TIMER
232 select HAVE_CACHE_SPLIT
235 Motorola ColdFire 5280/5282 processor support.
240 select COLDFIRE_TIMERS
241 select COLDFIRE_SW_A7
244 select CPU_NO_EFFICIENT_FFS
246 Motorola ColdFire 5307 processor support.
251 select COLDFIRE_TIMERS
255 Freescale (Motorola) ColdFire 532x processor support.
260 select COLDFIRE_TIMERS
264 Freescale ColdFire 537x processor support.
269 select COLDFIRE_SW_A7
270 select COLDFIRE_TIMERS
273 select CPU_NO_EFFICIENT_FFS
275 Motorola ColdFire 5407 processor support.
280 select COLDFIRE_SLTIMERS
281 select MMU_COLDFIRE if MMU
285 select CPU_NO_EFFICIENT_FFS
287 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
291 select COLDFIRE_SLTIMERS
292 select MMU_COLDFIRE if MMU
297 select CPU_NO_EFFICIENT_FFS
299 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
303 select COLDFIRE_PIT_TIMER
304 select MMU_COLDFIRE if MMU
307 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
321 config COLDFIRE_PIT_TIMER
324 config COLDFIRE_TIMERS
326 select LEGACY_TIMER_TICK
328 config COLDFIRE_SLTIMERS
330 select LEGACY_TIMER_TICK
334 comment "Processor Specific Options"
337 bool "Math emulation support"
338 depends on (M68KCLASSIC || SUN3) && FPU
340 At some point in the future, this will cause floating-point math
341 instructions to be emulated by the kernel on machines that lack a
342 floating-point math coprocessor. Thrill-seekers and chronically
343 sleep-deprived psychotic hacker types can say Y now, everyone else
344 should probably wait a while.
346 config M68KFPU_EMU_EXTRAPREC
347 bool "Math emulation extra precision"
348 depends on M68KFPU_EMU
350 The fpu uses normally a few bit more during calculations for
351 correct rounding, the emulator can (often) do the same but this
352 extra calculation can cost quite some time, so you can disable
353 it here. The emulator will then "only" calculate with a 64 bit
354 mantissa and round slightly incorrect, what is more than enough
357 config M68KFPU_EMU_ONLY
358 bool "Math emulation only kernel"
359 depends on M68KFPU_EMU
361 This option prevents any floating-point instructions from being
362 compiled into the kernel, thereby the kernel doesn't save any
363 floating point context anymore during task switches, so this
364 kernel will only be usable on machines without a floating-point
365 math coprocessor. This makes the kernel a bit faster as no tests
366 needs to be executed whether a floating-point instruction in the
367 kernel should be executed or not.
370 bool "Advanced configuration options"
373 This gives you access to some advanced options for the CPU. The
374 defaults should be fine for most users, but these options may make
375 it possible for you to improve performance somewhat if you know what
378 Note that the answer to this question won't directly affect the
379 kernel: saying N will just cause the configurator to skip all
380 the questions about these options.
382 Most users should say N to this question.
385 bool "Use read-modify-write instructions"
386 depends on ADVANCED && !CPU_HAS_NO_CAS
388 This allows to use certain instructions that work with indivisible
389 read-modify-write bus cycles. While this is faster than the
390 workaround of disabling interrupts, it can conflict with DMA
391 ( = direct memory access) on many Amiga systems, and it is also said
392 to destabilize other machines. It is very likely that this will
393 cause serious problems on any Amiga or Atari Medusa if set. The only
394 configuration where it should work are 68030-based Ataris, where it
395 apparently improves performance. But you've been warned! Unless you
396 really know what you are doing, say N. Try Y only if you're quite
399 config SINGLE_MEMORY_CHUNK
400 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
402 default y if SUN3 || MMU_COLDFIRE
404 Ignore all but the first contiguous chunk of physical memory for VM
405 purposes. This will save a few bytes kernel size and may speed up
407 When this option os set to N, you may want to lower "Maximum zone
408 order" to save memory that could be wasted for unused memory map.
411 config ARCH_FORCE_MAX_ORDER
412 int "Order of maximal physically contiguous allocations" if ADVANCED
413 depends on !SINGLE_MEMORY_CHUNK
416 The kernel page allocator limits the size of maximal physically
417 contiguous allocations. The limit is called MAX_PAGE_ORDER and it
418 defines the maximal power of two of number of pages that can be
419 allocated as a single contiguous block. This option allows
420 overriding the default setting when ability to allocate very
421 large blocks of physically contiguous memory is required.
423 For systems that have holes in their physical address space this
424 value also defines the minimal size of the hole that allows
425 freeing unused memory map.
427 Don't change if unsure.
429 config 060_WRITETHROUGH
430 bool "Use write-through caching for 68060 supervisor accesses"
431 depends on ADVANCED && M68060
433 The 68060 generally uses copyback caching of recently accessed data.
434 Copyback caching means that memory writes will be held in an on-chip
435 cache and only written back to memory some time later. Saying Y
436 here will force supervisor (kernel) accesses to use writethrough
437 caching. Writethrough caching means that data is written to memory
438 straight away, so that cache and memory data always agree.
439 Writethrough caching is less efficient, but is needed for some
440 drivers on 68060 based systems where the 68060 bus snooping signal
441 is hardwired on. The 53c710 SCSI driver is known to suffer from
449 config CPU_HAS_NO_BITFIELDS
452 config CPU_HAS_NO_CAS
455 config CPU_HAS_NO_MULDIV64
458 config CPU_HAS_NO_UNALIGNED
461 config CPU_HAS_ADDRESS_SPACES
463 select ALTERNATE_USER_ADDRESS_SPACE
468 config COLDFIRE_SW_A7
471 config HAVE_CACHE_SPLIT
484 int "Set the core clock frequency"
485 default "25000000" if M5206
486 default "54000000" if M5206e
487 default "166666666" if M520x
488 default "140000000" if M5249
489 default "150000000" if M527x || M523x
490 default "90000000" if M5307
491 default "50000000" if M5407
492 default "266000000" if M54xx
496 Define the CPU clock frequency in use. This is the core clock
497 frequency, it may or may not be the same as the external clock
498 crystal fitted to your board. Some processors have an internal
499 PLL and can have their frequency programmed at run time, others
500 use internal dividers. In general the kernel won't setup a PLL
501 if it is fitted (there are some exceptions). This value will be
502 specific to the exact CPU that you are using.
505 bool "Old mask 5307 (1H55J) silicon"
508 Build support for the older revision ColdFire 5307 silicon.
509 Specifically this is the 1H55J mask revision.
513 prompt "Split Cache Configuration"
519 Use all of the ColdFire CPU cache memory as an instruction cache.
524 Use all of the ColdFire CPU cache memory as a data cache.
529 Split the ColdFire CPU cache, and use half as an instruction cache
530 and half as a data cache.
532 endif # HAVE_CACHE_SPLIT
536 prompt "Data cache mode"
537 default CACHE_WRITETHRU
539 config CACHE_WRITETHRU
542 The ColdFire CPU cache is set into Write-through mode.
544 config CACHE_COPYBACK
547 The ColdFire CPU cache is set into Copy-back mode.
549 endif # HAVE_CACHE_CB
551 # Coldfire cores that do not have a data cache configured can do coherent DMA.
552 config COLDFIRE_COHERENT_DMA
556 depends on !HAVE_CACHE_CB && !CACHE_D && !CACHE_BOTH
558 config M68K_NONCOHERENT_DMA
561 depends on HAS_DMA && !COLDFIRE_COHERENT_DMA