1 comment "Processor Type"
4 prompt "CPU family support"
5 default M68KCLASSIC if MMU
6 default COLDFIRE if !MMU
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 derivative
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.
21 bool "Classic M68K CPU family support"
24 bool "Coldfire CPU family support"
25 select ARCH_HAVE_CUSTOM_GPIO_H
26 select CPU_HAS_NO_BITFIELDS
27 select CPU_HAS_NO_MULDIV64
39 select CPU_HAS_NO_BITFIELDS
40 select CPU_HAS_NO_MULDIV64
41 select CPU_HAS_NO_UNALIGNED
43 select CPU_NO_EFFICIENT_FFS
46 The Freescale (was Motorola) 68000 CPU is the first generation of
47 the well known M68K family of processors. The CPU core as well as
48 being available as a stand alone CPU was also used in many
49 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
54 select CPU_HAS_NO_BITFIELDS
55 select CPU_HAS_NO_UNALIGNED
56 select CPU_NO_EFFICIENT_FFS
58 The Freescale (was then Motorola) CPU32 is a CPU core that is
59 based on the 68020 processor. For the most part it is used in
60 System-On-Chip parts, and does not contain a paging MMU.
65 select CPU_HAS_ADDRESS_SPACES
67 If you anticipate running this kernel on a computer with a MC68020
68 processor, say Y. Otherwise, say N. Note that the 68020 requires a
69 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
70 Sun 3, which provides its own version.
74 depends on MMU && !MMU_SUN3
75 select CPU_HAS_ADDRESS_SPACES
77 If you anticipate running this kernel on a computer with a MC68030
78 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
79 work, as it does not include an MMU (Memory Management Unit).
83 depends on MMU && !MMU_SUN3
84 select CPU_HAS_ADDRESS_SPACES
86 If you anticipate running this kernel on a computer with a MC68LC040
87 or MC68040 processor, say Y. Otherwise, say N. Note that an
88 MC68EC040 will not work, as it does not include an MMU (Memory
93 depends on MMU && !MMU_SUN3
94 select CPU_HAS_ADDRESS_SPACES
96 If you anticipate running this kernel on a computer with a MC68060
97 processor, say Y. Otherwise, say N.
104 Motorola 68328 processor support.
111 Motorola 68EX328 processor support.
118 Motorola 68VZ328 processor support.
125 prompt "ColdFire SoC type"
128 Select the type of ColdFire System-on-Chip (SoC) that you want
134 select COLDFIRE_SW_A7
136 select CPU_NO_EFFICIENT_FFS
138 Motorola ColdFire 5206 processor support.
143 select COLDFIRE_SW_A7
145 select CPU_NO_EFFICIENT_FFS
147 Motorola ColdFire 5206e processor support.
152 select GENERIC_CLOCKEVENTS
153 select HAVE_CACHE_SPLIT
155 Freescale Coldfire 5207/5208 processor support.
160 select GENERIC_CLOCKEVENTS
161 select HAVE_CACHE_SPLIT
164 Freescale Coldfire 5230/1/2/4/5 processor support
169 select COLDFIRE_SW_A7
171 select CPU_NO_EFFICIENT_FFS
173 Motorola ColdFire 5249 processor support.
178 select COLDFIRE_SW_A7
180 select CPU_NO_EFFICIENT_FFS
182 Freescale (Motorola) Coldfire 5251/5253 processor support.
188 select HAVE_CACHE_SPLIT
190 select GENERIC_CLOCKEVENTS
192 Freescale (Motorola) ColdFire 5270/5271 processor support.
197 select COLDFIRE_SW_A7
199 select CPU_NO_EFFICIENT_FFS
201 Motorola ColdFire 5272 processor support.
207 select HAVE_CACHE_SPLIT
209 select GENERIC_CLOCKEVENTS
211 Freescale (Motorola) ColdFire 5274/5275 processor support.
216 select GENERIC_CLOCKEVENTS
217 select HAVE_CACHE_SPLIT
220 Motorola ColdFire 5280/5282 processor support.
225 select COLDFIRE_SW_A7
228 select CPU_NO_EFFICIENT_FFS
230 Motorola ColdFire 5307 processor support.
238 Freescale (Motorola) ColdFire 532x processor support.
246 Freescale ColdFire 537x processor support.
251 select COLDFIRE_SW_A7
254 select CPU_NO_EFFICIENT_FFS
256 Motorola ColdFire 5407 processor support.
261 select MMU_COLDFIRE if MMU
264 select CPU_NO_EFFICIENT_FFS
266 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
270 select MMU_COLDFIRE if MMU
274 select CPU_NO_EFFICIENT_FFS
276 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
281 select GENERIC_CLOCKEVENTS
284 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
300 comment "Processor Specific Options"
303 bool "Math emulation support"
306 At some point in the future, this will cause floating-point math
307 instructions to be emulated by the kernel on machines that lack a
308 floating-point math coprocessor. Thrill-seekers and chronically
309 sleep-deprived psychotic hacker types can say Y now, everyone else
310 should probably wait a while.
312 config M68KFPU_EMU_EXTRAPREC
313 bool "Math emulation extra precision"
314 depends on M68KFPU_EMU
316 The fpu uses normally a few bit more during calculations for
317 correct rounding, the emulator can (often) do the same but this
318 extra calculation can cost quite some time, so you can disable
319 it here. The emulator will then "only" calculate with a 64 bit
320 mantissa and round slightly incorrect, what is more than enough
323 config M68KFPU_EMU_ONLY
324 bool "Math emulation only kernel"
325 depends on M68KFPU_EMU
327 This option prevents any floating-point instructions from being
328 compiled into the kernel, thereby the kernel doesn't save any
329 floating point context anymore during task switches, so this
330 kernel will only be usable on machines without a floating-point
331 math coprocessor. This makes the kernel a bit faster as no tests
332 needs to be executed whether a floating-point instruction in the
333 kernel should be executed or not.
336 bool "Advanced configuration options"
339 This gives you access to some advanced options for the CPU. The
340 defaults should be fine for most users, but these options may make
341 it possible for you to improve performance somewhat if you know what
344 Note that the answer to this question won't directly affect the
345 kernel: saying N will just cause the configurator to skip all
346 the questions about these options.
348 Most users should say N to this question.
351 bool "Use read-modify-write instructions"
354 This allows to use certain instructions that work with indivisible
355 read-modify-write bus cycles. While this is faster than the
356 workaround of disabling interrupts, it can conflict with DMA
357 ( = direct memory access) on many Amiga systems, and it is also said
358 to destabilize other machines. It is very likely that this will
359 cause serious problems on any Amiga or Atari Medusa if set. The only
360 configuration where it should work are 68030-based Ataris, where it
361 apparently improves performance. But you've been warned! Unless you
362 really know what you are doing, say N. Try Y only if you're quite
365 config SINGLE_MEMORY_CHUNK
366 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
369 select NEED_MULTIPLE_NODES
371 Ignore all but the first contiguous chunk of physical memory for VM
372 purposes. This will save a few bytes kernel size and may speed up
373 some operations. Say N if not sure.
375 config ARCH_DISCONTIGMEM_ENABLE
376 def_bool MMU && !SINGLE_MEMORY_CHUNK
378 config 060_WRITETHROUGH
379 bool "Use write-through caching for 68060 supervisor accesses"
380 depends on ADVANCED && M68060
382 The 68060 generally uses copyback caching of recently accessed data.
383 Copyback caching means that memory writes will be held in an on-chip
384 cache and only written back to memory some time later. Saying Y
385 here will force supervisor (kernel) accesses to use writethrough
386 caching. Writethrough caching means that data is written to memory
387 straight away, so that cache and memory data always agree.
388 Writethrough caching is less efficient, but is needed for some
389 drivers on 68060 based systems where the 68060 bus snooping signal
390 is hardwired on. The 53c710 SCSI driver is known to suffer from
401 depends on !SINGLE_MEMORY_CHUNK
403 config CPU_HAS_NO_BITFIELDS
406 config CPU_HAS_NO_MULDIV64
409 config CPU_HAS_NO_UNALIGNED
412 config CPU_HAS_ADDRESS_SPACES
418 config COLDFIRE_SW_A7
421 config HAVE_CACHE_SPLIT
434 int "Set the core clock frequency"
435 default "25000000" if M5206
436 default "54000000" if M5206e
437 default "166666666" if M520x
438 default "140000000" if M5249
439 default "150000000" if M527x || M523x
440 default "90000000" if M5307
441 default "50000000" if M5407
442 default "266000000" if M54xx
446 Define the CPU clock frequency in use. This is the core clock
447 frequency, it may or may not be the same as the external clock
448 crystal fitted to your board. Some processors have an internal
449 PLL and can have their frequency programmed at run time, others
450 use internal dividers. In general the kernel won't setup a PLL
451 if it is fitted (there are some exceptions). This value will be
452 specific to the exact CPU that you are using.
455 bool "Old mask 5307 (1H55J) silicon"
458 Build support for the older revision ColdFire 5307 silicon.
459 Specifically this is the 1H55J mask revision.
463 prompt "Split Cache Configuration"
469 Use all of the ColdFire CPU cache memory as an instruction cache.
474 Use all of the ColdFire CPU cache memory as a data cache.
479 Split the ColdFire CPU cache, and use half as an instruction cache
480 and half as a data cache.
486 prompt "Data cache mode"
487 default CACHE_WRITETHRU
489 config CACHE_WRITETHRU
492 The ColdFire CPU cache is set into Write-through mode.
494 config CACHE_COPYBACK
497 The ColdFire CPU cache is set into Copy-back mode.