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_REQUIRE_GPIOLIB
26 select ARCH_HAVE_CUSTOM_GPIO_H
27 select CPU_HAS_NO_BITFIELDS
28 select CPU_HAS_NO_MULDIV64
39 select CPU_HAS_NO_BITFIELDS
40 select CPU_HAS_NO_MULDIV64
41 select CPU_HAS_NO_UNALIGNED
44 The Freescale (was Motorola) 68000 CPU is the first generation of
45 the well known M68K family of processors. The CPU core as well as
46 being available as a stand alone CPU was also used in many
47 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
52 select CPU_HAS_NO_BITFIELDS
53 select CPU_HAS_NO_UNALIGNED
55 The Freescale (was then Motorola) CPU32 is a CPU core that is
56 based on the 68020 processor. For the most part it is used in
57 System-On-Chip parts, and does not contain a paging MMU.
62 select CPU_HAS_ADDRESS_SPACES
64 If you anticipate running this kernel on a computer with a MC68020
65 processor, say Y. Otherwise, say N. Note that the 68020 requires a
66 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
67 Sun 3, which provides its own version.
71 depends on MMU && !MMU_SUN3
72 select CPU_HAS_ADDRESS_SPACES
74 If you anticipate running this kernel on a computer with a MC68030
75 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
76 work, as it does not include an MMU (Memory Management Unit).
80 depends on MMU && !MMU_SUN3
81 select CPU_HAS_ADDRESS_SPACES
83 If you anticipate running this kernel on a computer with a MC68LC040
84 or MC68040 processor, say Y. Otherwise, say N. Note that an
85 MC68EC040 will not work, as it does not include an MMU (Memory
90 depends on MMU && !MMU_SUN3
91 select CPU_HAS_ADDRESS_SPACES
93 If you anticipate running this kernel on a computer with a MC68060
94 processor, say Y. Otherwise, say N.
101 Motorola 68328 processor support.
108 Motorola 68EX328 processor support.
115 Motorola 68VZ328 processor support.
122 prompt "ColdFire SoC type"
125 Select the type of ColdFire System-on-Chip (SoC) that you want
131 select COLDFIRE_SW_A7
134 Motorola ColdFire 5206 processor support.
139 select COLDFIRE_SW_A7
142 Motorola ColdFire 5206e processor support.
147 select GENERIC_CLOCKEVENTS
148 select HAVE_CACHE_SPLIT
150 Freescale Coldfire 5207/5208 processor support.
155 select GENERIC_CLOCKEVENTS
156 select HAVE_CACHE_SPLIT
159 Freescale Coldfire 5230/1/2/4/5 processor support
164 select COLDFIRE_SW_A7
167 Motorola ColdFire 5249 processor support.
172 select COLDFIRE_SW_A7
175 Freescale (Motorola) Coldfire 5251/5253 processor support.
181 select HAVE_CACHE_SPLIT
183 select GENERIC_CLOCKEVENTS
185 Freescale (Motorola) ColdFire 5270/5271 processor support.
190 select COLDFIRE_SW_A7
193 Motorola ColdFire 5272 processor support.
199 select HAVE_CACHE_SPLIT
201 select GENERIC_CLOCKEVENTS
203 Freescale (Motorola) ColdFire 5274/5275 processor support.
208 select GENERIC_CLOCKEVENTS
209 select HAVE_CACHE_SPLIT
212 Motorola ColdFire 5280/5282 processor support.
217 select COLDFIRE_SW_A7
221 Motorola ColdFire 5307 processor support.
229 Freescale (Motorola) ColdFire 532x processor support.
237 Freescale ColdFire 537x processor support.
242 select COLDFIRE_SW_A7
246 Motorola ColdFire 5407 processor support.
251 select MMU_COLDFIRE if MMU
255 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
259 select MMU_COLDFIRE if MMU
264 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
269 select GENERIC_CLOCKEVENTS
272 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
288 comment "Processor Specific Options"
291 bool "Math emulation support"
294 At some point in the future, this will cause floating-point math
295 instructions to be emulated by the kernel on machines that lack a
296 floating-point math coprocessor. Thrill-seekers and chronically
297 sleep-deprived psychotic hacker types can say Y now, everyone else
298 should probably wait a while.
300 config M68KFPU_EMU_EXTRAPREC
301 bool "Math emulation extra precision"
302 depends on M68KFPU_EMU
304 The fpu uses normally a few bit more during calculations for
305 correct rounding, the emulator can (often) do the same but this
306 extra calculation can cost quite some time, so you can disable
307 it here. The emulator will then "only" calculate with a 64 bit
308 mantissa and round slightly incorrect, what is more than enough
311 config M68KFPU_EMU_ONLY
312 bool "Math emulation only kernel"
313 depends on M68KFPU_EMU
315 This option prevents any floating-point instructions from being
316 compiled into the kernel, thereby the kernel doesn't save any
317 floating point context anymore during task switches, so this
318 kernel will only be usable on machines without a floating-point
319 math coprocessor. This makes the kernel a bit faster as no tests
320 needs to be executed whether a floating-point instruction in the
321 kernel should be executed or not.
324 bool "Advanced configuration options"
327 This gives you access to some advanced options for the CPU. The
328 defaults should be fine for most users, but these options may make
329 it possible for you to improve performance somewhat if you know what
332 Note that the answer to this question won't directly affect the
333 kernel: saying N will just cause the configurator to skip all
334 the questions about these options.
336 Most users should say N to this question.
339 bool "Use read-modify-write instructions"
342 This allows to use certain instructions that work with indivisible
343 read-modify-write bus cycles. While this is faster than the
344 workaround of disabling interrupts, it can conflict with DMA
345 ( = direct memory access) on many Amiga systems, and it is also said
346 to destabilize other machines. It is very likely that this will
347 cause serious problems on any Amiga or Atari Medusa if set. The only
348 configuration where it should work are 68030-based Ataris, where it
349 apparently improves performance. But you've been warned! Unless you
350 really know what you are doing, say N. Try Y only if you're quite
353 config SINGLE_MEMORY_CHUNK
354 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
357 select NEED_MULTIPLE_NODES
359 Ignore all but the first contiguous chunk of physical memory for VM
360 purposes. This will save a few bytes kernel size and may speed up
361 some operations. Say N if not sure.
363 config ARCH_DISCONTIGMEM_ENABLE
364 def_bool MMU && !SINGLE_MEMORY_CHUNK
366 config 060_WRITETHROUGH
367 bool "Use write-through caching for 68060 supervisor accesses"
368 depends on ADVANCED && M68060
370 The 68060 generally uses copyback caching of recently accessed data.
371 Copyback caching means that memory writes will be held in an on-chip
372 cache and only written back to memory some time later. Saying Y
373 here will force supervisor (kernel) accesses to use writethrough
374 caching. Writethrough caching means that data is written to memory
375 straight away, so that cache and memory data always agree.
376 Writethrough caching is less efficient, but is needed for some
377 drivers on 68060 based systems where the 68060 bus snooping signal
378 is hardwired on. The 53c710 SCSI driver is known to suffer from
389 depends on !SINGLE_MEMORY_CHUNK
391 config CPU_HAS_NO_BITFIELDS
394 config CPU_HAS_NO_MULDIV64
397 config CPU_HAS_NO_UNALIGNED
400 config CPU_HAS_ADDRESS_SPACES
406 config COLDFIRE_SW_A7
409 config HAVE_CACHE_SPLIT
422 int "Set the core clock frequency"
423 default "25000000" if M5206
424 default "54000000" if M5206e
425 default "166666666" if M520x
426 default "140000000" if M5249
427 default "150000000" if M527x || M523x
428 default "90000000" if M5307
429 default "50000000" if M5407
430 default "266000000" if M54xx
434 Define the CPU clock frequency in use. This is the core clock
435 frequency, it may or may not be the same as the external clock
436 crystal fitted to your board. Some processors have an internal
437 PLL and can have their frequency programmed at run time, others
438 use internal dividers. In general the kernel won't setup a PLL
439 if it is fitted (there are some exceptions). This value will be
440 specific to the exact CPU that you are using.
443 bool "Old mask 5307 (1H55J) silicon"
446 Build support for the older revision ColdFire 5307 silicon.
447 Specifically this is the 1H55J mask revision.
451 prompt "Split Cache Configuration"
457 Use all of the ColdFire CPU cache memory as an instruction cache.
462 Use all of the ColdFire CPU cache memory as a data cache.
467 Split the ColdFire CPU cache, and use half as an instruction cache
468 and half as a data cache.
474 prompt "Data cache mode"
475 default CACHE_WRITETHRU
477 config CACHE_WRITETHRU
480 The ColdFire CPU cache is set into Write-through mode.
482 config CACHE_COPYBACK
485 The ColdFire CPU cache is set into Copy-back mode.