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
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
141 select CPU_NO_EFFICIENT_FFS
143 Motorola ColdFire 5206 processor support.
148 select COLDFIRE_SW_A7
150 select CPU_NO_EFFICIENT_FFS
152 Motorola ColdFire 5206e processor support.
157 select GENERIC_CLOCKEVENTS
158 select HAVE_CACHE_SPLIT
160 Freescale Coldfire 5207/5208 processor support.
165 select GENERIC_CLOCKEVENTS
166 select HAVE_CACHE_SPLIT
169 Freescale Coldfire 5230/1/2/4/5 processor support
174 select COLDFIRE_SW_A7
176 select CPU_NO_EFFICIENT_FFS
178 Motorola ColdFire 5249 processor support.
183 select COLDFIRE_SW_A7
185 select CPU_NO_EFFICIENT_FFS
187 Freescale (Motorola) Coldfire 5251/5253 processor support.
193 select HAVE_CACHE_SPLIT
195 select GENERIC_CLOCKEVENTS
197 Freescale (Motorola) ColdFire 5270/5271 processor support.
202 select COLDFIRE_SW_A7
204 select CPU_NO_EFFICIENT_FFS
206 Motorola ColdFire 5272 processor support.
212 select HAVE_CACHE_SPLIT
214 select GENERIC_CLOCKEVENTS
216 Freescale (Motorola) ColdFire 5274/5275 processor support.
221 select GENERIC_CLOCKEVENTS
222 select HAVE_CACHE_SPLIT
225 Motorola ColdFire 5280/5282 processor support.
230 select COLDFIRE_SW_A7
233 select CPU_NO_EFFICIENT_FFS
235 Motorola ColdFire 5307 processor support.
243 Freescale (Motorola) ColdFire 532x processor support.
251 Freescale ColdFire 537x processor support.
256 select COLDFIRE_SW_A7
259 select CPU_NO_EFFICIENT_FFS
261 Motorola ColdFire 5407 processor support.
266 select MMU_COLDFIRE if MMU
270 select CPU_NO_EFFICIENT_FFS
272 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
276 select MMU_COLDFIRE if MMU
281 select CPU_NO_EFFICIENT_FFS
283 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
287 select MMU_COLDFIRE if MMU
288 select GENERIC_CLOCKEVENTS
291 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
307 comment "Processor Specific Options"
310 bool "Math emulation support"
313 At some point in the future, this will cause floating-point math
314 instructions to be emulated by the kernel on machines that lack a
315 floating-point math coprocessor. Thrill-seekers and chronically
316 sleep-deprived psychotic hacker types can say Y now, everyone else
317 should probably wait a while.
319 config M68KFPU_EMU_EXTRAPREC
320 bool "Math emulation extra precision"
321 depends on M68KFPU_EMU
323 The fpu uses normally a few bit more during calculations for
324 correct rounding, the emulator can (often) do the same but this
325 extra calculation can cost quite some time, so you can disable
326 it here. The emulator will then "only" calculate with a 64 bit
327 mantissa and round slightly incorrect, what is more than enough
330 config M68KFPU_EMU_ONLY
331 bool "Math emulation only kernel"
332 depends on M68KFPU_EMU
334 This option prevents any floating-point instructions from being
335 compiled into the kernel, thereby the kernel doesn't save any
336 floating point context anymore during task switches, so this
337 kernel will only be usable on machines without a floating-point
338 math coprocessor. This makes the kernel a bit faster as no tests
339 needs to be executed whether a floating-point instruction in the
340 kernel should be executed or not.
343 bool "Advanced configuration options"
346 This gives you access to some advanced options for the CPU. The
347 defaults should be fine for most users, but these options may make
348 it possible for you to improve performance somewhat if you know what
351 Note that the answer to this question won't directly affect the
352 kernel: saying N will just cause the configurator to skip all
353 the questions about these options.
355 Most users should say N to this question.
358 bool "Use read-modify-write instructions"
361 This allows to use certain instructions that work with indivisible
362 read-modify-write bus cycles. While this is faster than the
363 workaround of disabling interrupts, it can conflict with DMA
364 ( = direct memory access) on many Amiga systems, and it is also said
365 to destabilize other machines. It is very likely that this will
366 cause serious problems on any Amiga or Atari Medusa if set. The only
367 configuration where it should work are 68030-based Ataris, where it
368 apparently improves performance. But you've been warned! Unless you
369 really know what you are doing, say N. Try Y only if you're quite
372 config SINGLE_MEMORY_CHUNK
373 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
376 select NEED_MULTIPLE_NODES
378 Ignore all but the first contiguous chunk of physical memory for VM
379 purposes. This will save a few bytes kernel size and may speed up
380 some operations. Say N if not sure.
382 config ARCH_DISCONTIGMEM_ENABLE
383 def_bool MMU && !SINGLE_MEMORY_CHUNK
385 config 060_WRITETHROUGH
386 bool "Use write-through caching for 68060 supervisor accesses"
387 depends on ADVANCED && M68060
389 The 68060 generally uses copyback caching of recently accessed data.
390 Copyback caching means that memory writes will be held in an on-chip
391 cache and only written back to memory some time later. Saying Y
392 here will force supervisor (kernel) accesses to use writethrough
393 caching. Writethrough caching means that data is written to memory
394 straight away, so that cache and memory data always agree.
395 Writethrough caching is less efficient, but is needed for some
396 drivers on 68060 based systems where the 68060 bus snooping signal
397 is hardwired on. The 53c710 SCSI driver is known to suffer from
408 depends on !SINGLE_MEMORY_CHUNK
410 config CPU_HAS_NO_BITFIELDS
413 config CPU_HAS_NO_MULDIV64
416 config CPU_HAS_NO_UNALIGNED
419 config CPU_HAS_ADDRESS_SPACES
425 config COLDFIRE_SW_A7
428 config HAVE_CACHE_SPLIT
441 int "Set the core clock frequency"
442 default "25000000" if M5206
443 default "54000000" if M5206e
444 default "166666666" if M520x
445 default "140000000" if M5249
446 default "150000000" if M527x || M523x
447 default "90000000" if M5307
448 default "50000000" if M5407
449 default "266000000" if M54xx
453 Define the CPU clock frequency in use. This is the core clock
454 frequency, it may or may not be the same as the external clock
455 crystal fitted to your board. Some processors have an internal
456 PLL and can have their frequency programmed at run time, others
457 use internal dividers. In general the kernel won't setup a PLL
458 if it is fitted (there are some exceptions). This value will be
459 specific to the exact CPU that you are using.
462 bool "Old mask 5307 (1H55J) silicon"
465 Build support for the older revision ColdFire 5307 silicon.
466 Specifically this is the 1H55J mask revision.
470 prompt "Split Cache Configuration"
476 Use all of the ColdFire CPU cache memory as an instruction cache.
481 Use all of the ColdFire CPU cache memory as a data cache.
486 Split the ColdFire CPU cache, and use half as an instruction cache
487 and half as a data cache.
493 prompt "Data cache mode"
494 default CACHE_WRITETHRU
496 config CACHE_WRITETHRU
499 The ColdFire CPU cache is set into Write-through mode.
501 config CACHE_COPYBACK
504 The ColdFire CPU cache is set into Copy-back mode.