1 # SPDX-License-Identifier: GPL-2.0
2 comment "Processor Type"
5 prompt "CPU 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 family support"
25 bool "Coldfire CPU family support"
26 select ARCH_HAVE_CUSTOM_GPIO_H
27 select CPU_HAS_NO_BITFIELDS
28 select CPU_HAS_NO_MULDIV64
31 select HAVE_LEGACY_CLK
40 select CPU_HAS_NO_BITFIELDS
41 select CPU_HAS_NO_MULDIV64
42 select CPU_HAS_NO_UNALIGNED
44 select CPU_NO_EFFICIENT_FFS
47 The Freescale (was Motorola) 68000 CPU is the first generation of
48 the well known M68K family of processors. The CPU core as well as
49 being available as a stand alone CPU was also used in many
50 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
55 select CPU_HAS_NO_BITFIELDS
56 select CPU_HAS_NO_UNALIGNED
57 select CPU_NO_EFFICIENT_FFS
59 The Freescale (was then Motorola) CPU32 is a CPU core that is
60 based on the 68020 processor. For the most part it is used in
61 System-On-Chip parts, and does not contain a paging MMU.
67 select CPU_HAS_ADDRESS_SPACES
69 If you anticipate running this kernel on a computer with a MC68020
70 processor, say Y. Otherwise, say N. Note that the 68020 requires a
71 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
72 Sun 3, which provides its own version.
76 depends on MMU && !MMU_SUN3
78 select CPU_HAS_ADDRESS_SPACES
80 If you anticipate running this kernel on a computer with a MC68030
81 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
82 work, as it does not include an MMU (Memory Management Unit).
86 depends on MMU && !MMU_SUN3
88 select CPU_HAS_ADDRESS_SPACES
90 If you anticipate running this kernel on a computer with a MC68LC040
91 or MC68040 processor, say Y. Otherwise, say N. Note that an
92 MC68EC040 will not work, as it does not include an MMU (Memory
97 depends on MMU && !MMU_SUN3
99 select CPU_HAS_ADDRESS_SPACES
101 If you anticipate running this kernel on a computer with a MC68060
102 processor, say Y. Otherwise, say N.
109 Motorola 68328 processor support.
116 Motorola 68EX328 processor support.
123 Motorola 68VZ328 processor support.
130 prompt "ColdFire SoC type"
133 Select the type of ColdFire System-on-Chip (SoC) that you want
139 select COLDFIRE_SW_A7
140 select COLDFIRE_TIMERS
142 select CPU_NO_EFFICIENT_FFS
144 Motorola ColdFire 5206 processor support.
149 select COLDFIRE_SW_A7
150 select COLDFIRE_TIMERS
152 select CPU_NO_EFFICIENT_FFS
154 Motorola ColdFire 5206e processor support.
159 select COLDFIRE_PIT_TIMER
160 select HAVE_CACHE_SPLIT
162 Freescale Coldfire 5207/5208 processor support.
167 select COLDFIRE_PIT_TIMER
168 select HAVE_CACHE_SPLIT
171 Freescale Coldfire 5230/1/2/4/5 processor support
176 select COLDFIRE_SW_A7
177 select COLDFIRE_TIMERS
179 select CPU_NO_EFFICIENT_FFS
181 Motorola ColdFire 5249 processor support.
186 select COLDFIRE_SW_A7
187 select COLDFIRE_TIMERS
189 select CPU_NO_EFFICIENT_FFS
191 Freescale (Motorola) Coldfire 5251/5253 processor support.
196 select COLDFIRE_PIT_TIMER
198 select HAVE_CACHE_SPLIT
201 Freescale (Motorola) ColdFire 5270/5271 processor support.
206 select COLDFIRE_SW_A7
207 select COLDFIRE_TIMERS
209 select CPU_NO_EFFICIENT_FFS
211 Motorola ColdFire 5272 processor support.
216 select COLDFIRE_PIT_TIMER
218 select HAVE_CACHE_SPLIT
221 Freescale (Motorola) ColdFire 5274/5275 processor support.
226 select COLDFIRE_PIT_TIMER
227 select HAVE_CACHE_SPLIT
230 Motorola ColdFire 5280/5282 processor support.
235 select COLDFIRE_TIMERS
236 select COLDFIRE_SW_A7
239 select CPU_NO_EFFICIENT_FFS
241 Motorola ColdFire 5307 processor support.
246 select COLDFIRE_TIMERS
250 Freescale (Motorola) ColdFire 532x processor support.
255 select COLDFIRE_TIMERS
259 Freescale ColdFire 537x processor support.
264 select COLDFIRE_SW_A7
265 select COLDFIRE_TIMERS
268 select CPU_NO_EFFICIENT_FFS
270 Motorola ColdFire 5407 processor support.
275 select COLDFIRE_SLTIMERS
276 select MMU_COLDFIRE if MMU
280 select CPU_NO_EFFICIENT_FFS
282 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
286 select COLDFIRE_SLTIMERS
287 select MMU_COLDFIRE if MMU
292 select CPU_NO_EFFICIENT_FFS
294 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
298 select COLDFIRE_PIT_TIMER
299 select MMU_COLDFIRE if MMU
302 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
316 config COLDFIRE_PIT_TIMER
318 select GENERIC_CLOCKEVENTS
320 config COLDFIRE_TIMERS
322 select LEGACY_TIMER_TICK
324 config COLDFIRE_SLTIMERS
326 select LEGACY_TIMER_TICK
331 comment "Processor Specific Options"
334 bool "Math emulation support"
337 At some point in the future, this will cause floating-point math
338 instructions to be emulated by the kernel on machines that lack a
339 floating-point math coprocessor. Thrill-seekers and chronically
340 sleep-deprived psychotic hacker types can say Y now, everyone else
341 should probably wait a while.
343 config M68KFPU_EMU_EXTRAPREC
344 bool "Math emulation extra precision"
345 depends on M68KFPU_EMU
347 The fpu uses normally a few bit more during calculations for
348 correct rounding, the emulator can (often) do the same but this
349 extra calculation can cost quite some time, so you can disable
350 it here. The emulator will then "only" calculate with a 64 bit
351 mantissa and round slightly incorrect, what is more than enough
354 config M68KFPU_EMU_ONLY
355 bool "Math emulation only kernel"
356 depends on M68KFPU_EMU
358 This option prevents any floating-point instructions from being
359 compiled into the kernel, thereby the kernel doesn't save any
360 floating point context anymore during task switches, so this
361 kernel will only be usable on machines without a floating-point
362 math coprocessor. This makes the kernel a bit faster as no tests
363 needs to be executed whether a floating-point instruction in the
364 kernel should be executed or not.
367 bool "Advanced configuration options"
370 This gives you access to some advanced options for the CPU. The
371 defaults should be fine for most users, but these options may make
372 it possible for you to improve performance somewhat if you know what
375 Note that the answer to this question won't directly affect the
376 kernel: saying N will just cause the configurator to skip all
377 the questions about these options.
379 Most users should say N to this question.
382 bool "Use read-modify-write instructions"
385 This allows to use certain instructions that work with indivisible
386 read-modify-write bus cycles. While this is faster than the
387 workaround of disabling interrupts, it can conflict with DMA
388 ( = direct memory access) on many Amiga systems, and it is also said
389 to destabilize other machines. It is very likely that this will
390 cause serious problems on any Amiga or Atari Medusa if set. The only
391 configuration where it should work are 68030-based Ataris, where it
392 apparently improves performance. But you've been warned! Unless you
393 really know what you are doing, say N. Try Y only if you're quite
396 config SINGLE_MEMORY_CHUNK
397 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
400 select NEED_MULTIPLE_NODES
402 Ignore all but the first contiguous chunk of physical memory for VM
403 purposes. This will save a few bytes kernel size and may speed up
404 some operations. Say N if not sure.
406 config ARCH_DISCONTIGMEM_ENABLE
407 def_bool MMU && !SINGLE_MEMORY_CHUNK
409 config 060_WRITETHROUGH
410 bool "Use write-through caching for 68060 supervisor accesses"
411 depends on ADVANCED && M68060
413 The 68060 generally uses copyback caching of recently accessed data.
414 Copyback caching means that memory writes will be held in an on-chip
415 cache and only written back to memory some time later. Saying Y
416 here will force supervisor (kernel) accesses to use writethrough
417 caching. Writethrough caching means that data is written to memory
418 straight away, so that cache and memory data always agree.
419 Writethrough caching is less efficient, but is needed for some
420 drivers on 68060 based systems where the 68060 bus snooping signal
421 is hardwired on. The 53c710 SCSI driver is known to suffer from
432 depends on !SINGLE_MEMORY_CHUNK
434 config CPU_HAS_NO_BITFIELDS
437 config CPU_HAS_NO_MULDIV64
440 config CPU_HAS_NO_UNALIGNED
443 config CPU_HAS_ADDRESS_SPACES
449 config COLDFIRE_SW_A7
452 config HAVE_CACHE_SPLIT
465 int "Set the core clock frequency"
466 default "25000000" if M5206
467 default "54000000" if M5206e
468 default "166666666" if M520x
469 default "140000000" if M5249
470 default "150000000" if M527x || M523x
471 default "90000000" if M5307
472 default "50000000" if M5407
473 default "266000000" if M54xx
477 Define the CPU clock frequency in use. This is the core clock
478 frequency, it may or may not be the same as the external clock
479 crystal fitted to your board. Some processors have an internal
480 PLL and can have their frequency programmed at run time, others
481 use internal dividers. In general the kernel won't setup a PLL
482 if it is fitted (there are some exceptions). This value will be
483 specific to the exact CPU that you are using.
486 bool "Old mask 5307 (1H55J) silicon"
489 Build support for the older revision ColdFire 5307 silicon.
490 Specifically this is the 1H55J mask revision.
494 prompt "Split Cache Configuration"
500 Use all of the ColdFire CPU cache memory as an instruction cache.
505 Use all of the ColdFire CPU cache memory as a data cache.
510 Split the ColdFire CPU cache, and use half as an instruction cache
511 and half as a data cache.
517 prompt "Data cache mode"
518 default CACHE_WRITETHRU
520 config CACHE_WRITETHRU
523 The ColdFire CPU cache is set into Write-through mode.
525 config CACHE_COPYBACK
528 The ColdFire CPU cache is set into Copy-back mode.