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.
66 select CPU_HAS_ADDRESS_SPACES
68 If you anticipate running this kernel on a computer with a MC68020
69 processor, say Y. Otherwise, say N. Note that the 68020 requires a
70 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
71 Sun 3, which provides its own version.
75 depends on MMU && !MMU_SUN3
77 select CPU_HAS_ADDRESS_SPACES
79 If you anticipate running this kernel on a computer with a MC68030
80 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
81 work, as it does not include an MMU (Memory Management Unit).
85 depends on MMU && !MMU_SUN3
87 select CPU_HAS_ADDRESS_SPACES
89 If you anticipate running this kernel on a computer with a MC68LC040
90 or MC68040 processor, say Y. Otherwise, say N. Note that an
91 MC68EC040 will not work, as it does not include an MMU (Memory
96 depends on MMU && !MMU_SUN3
98 select CPU_HAS_ADDRESS_SPACES
100 If you anticipate running this kernel on a computer with a MC68060
101 processor, say Y. Otherwise, say N.
108 Motorola 68328 processor support.
115 Motorola 68EX328 processor support.
122 Motorola 68VZ328 processor support.
129 prompt "ColdFire SoC type"
132 Select the type of ColdFire System-on-Chip (SoC) that you want
138 select COLDFIRE_SW_A7
140 select CPU_NO_EFFICIENT_FFS
142 Motorola ColdFire 5206 processor support.
147 select COLDFIRE_SW_A7
149 select CPU_NO_EFFICIENT_FFS
151 Motorola ColdFire 5206e processor support.
156 select GENERIC_CLOCKEVENTS
157 select HAVE_CACHE_SPLIT
159 Freescale Coldfire 5207/5208 processor support.
164 select GENERIC_CLOCKEVENTS
165 select HAVE_CACHE_SPLIT
168 Freescale Coldfire 5230/1/2/4/5 processor support
173 select COLDFIRE_SW_A7
175 select CPU_NO_EFFICIENT_FFS
177 Motorola ColdFire 5249 processor support.
182 select COLDFIRE_SW_A7
184 select CPU_NO_EFFICIENT_FFS
186 Freescale (Motorola) Coldfire 5251/5253 processor support.
192 select HAVE_CACHE_SPLIT
194 select GENERIC_CLOCKEVENTS
196 Freescale (Motorola) ColdFire 5270/5271 processor support.
201 select COLDFIRE_SW_A7
203 select CPU_NO_EFFICIENT_FFS
205 Motorola ColdFire 5272 processor support.
211 select HAVE_CACHE_SPLIT
213 select GENERIC_CLOCKEVENTS
215 Freescale (Motorola) ColdFire 5274/5275 processor support.
220 select GENERIC_CLOCKEVENTS
221 select HAVE_CACHE_SPLIT
224 Motorola ColdFire 5280/5282 processor support.
229 select COLDFIRE_SW_A7
232 select CPU_NO_EFFICIENT_FFS
234 Motorola ColdFire 5307 processor support.
242 Freescale (Motorola) ColdFire 532x processor support.
250 Freescale ColdFire 537x processor support.
255 select COLDFIRE_SW_A7
258 select CPU_NO_EFFICIENT_FFS
260 Motorola ColdFire 5407 processor support.
265 select MMU_COLDFIRE if MMU
269 select CPU_NO_EFFICIENT_FFS
271 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
275 select MMU_COLDFIRE if MMU
280 select CPU_NO_EFFICIENT_FFS
282 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
287 select GENERIC_CLOCKEVENTS
290 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
306 comment "Processor Specific Options"
309 bool "Math emulation support"
312 At some point in the future, this will cause floating-point math
313 instructions to be emulated by the kernel on machines that lack a
314 floating-point math coprocessor. Thrill-seekers and chronically
315 sleep-deprived psychotic hacker types can say Y now, everyone else
316 should probably wait a while.
318 config M68KFPU_EMU_EXTRAPREC
319 bool "Math emulation extra precision"
320 depends on M68KFPU_EMU
322 The fpu uses normally a few bit more during calculations for
323 correct rounding, the emulator can (often) do the same but this
324 extra calculation can cost quite some time, so you can disable
325 it here. The emulator will then "only" calculate with a 64 bit
326 mantissa and round slightly incorrect, what is more than enough
329 config M68KFPU_EMU_ONLY
330 bool "Math emulation only kernel"
331 depends on M68KFPU_EMU
333 This option prevents any floating-point instructions from being
334 compiled into the kernel, thereby the kernel doesn't save any
335 floating point context anymore during task switches, so this
336 kernel will only be usable on machines without a floating-point
337 math coprocessor. This makes the kernel a bit faster as no tests
338 needs to be executed whether a floating-point instruction in the
339 kernel should be executed or not.
342 bool "Advanced configuration options"
345 This gives you access to some advanced options for the CPU. The
346 defaults should be fine for most users, but these options may make
347 it possible for you to improve performance somewhat if you know what
350 Note that the answer to this question won't directly affect the
351 kernel: saying N will just cause the configurator to skip all
352 the questions about these options.
354 Most users should say N to this question.
357 bool "Use read-modify-write instructions"
360 This allows to use certain instructions that work with indivisible
361 read-modify-write bus cycles. While this is faster than the
362 workaround of disabling interrupts, it can conflict with DMA
363 ( = direct memory access) on many Amiga systems, and it is also said
364 to destabilize other machines. It is very likely that this will
365 cause serious problems on any Amiga or Atari Medusa if set. The only
366 configuration where it should work are 68030-based Ataris, where it
367 apparently improves performance. But you've been warned! Unless you
368 really know what you are doing, say N. Try Y only if you're quite
371 config SINGLE_MEMORY_CHUNK
372 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
375 select NEED_MULTIPLE_NODES
377 Ignore all but the first contiguous chunk of physical memory for VM
378 purposes. This will save a few bytes kernel size and may speed up
379 some operations. Say N if not sure.
381 config ARCH_DISCONTIGMEM_ENABLE
382 def_bool MMU && !SINGLE_MEMORY_CHUNK
384 config 060_WRITETHROUGH
385 bool "Use write-through caching for 68060 supervisor accesses"
386 depends on ADVANCED && M68060
388 The 68060 generally uses copyback caching of recently accessed data.
389 Copyback caching means that memory writes will be held in an on-chip
390 cache and only written back to memory some time later. Saying Y
391 here will force supervisor (kernel) accesses to use writethrough
392 caching. Writethrough caching means that data is written to memory
393 straight away, so that cache and memory data always agree.
394 Writethrough caching is less efficient, but is needed for some
395 drivers on 68060 based systems where the 68060 bus snooping signal
396 is hardwired on. The 53c710 SCSI driver is known to suffer from
407 depends on !SINGLE_MEMORY_CHUNK
409 config CPU_HAS_NO_BITFIELDS
412 config CPU_HAS_NO_MULDIV64
415 config CPU_HAS_NO_UNALIGNED
418 config CPU_HAS_ADDRESS_SPACES
424 config COLDFIRE_SW_A7
427 config HAVE_CACHE_SPLIT
440 int "Set the core clock frequency"
441 default "25000000" if M5206
442 default "54000000" if M5206e
443 default "166666666" if M520x
444 default "140000000" if M5249
445 default "150000000" if M527x || M523x
446 default "90000000" if M5307
447 default "50000000" if M5407
448 default "266000000" if M54xx
452 Define the CPU clock frequency in use. This is the core clock
453 frequency, it may or may not be the same as the external clock
454 crystal fitted to your board. Some processors have an internal
455 PLL and can have their frequency programmed at run time, others
456 use internal dividers. In general the kernel won't setup a PLL
457 if it is fitted (there are some exceptions). This value will be
458 specific to the exact CPU that you are using.
461 bool "Old mask 5307 (1H55J) silicon"
464 Build support for the older revision ColdFire 5307 silicon.
465 Specifically this is the 1H55J mask revision.
469 prompt "Split Cache Configuration"
475 Use all of the ColdFire CPU cache memory as an instruction cache.
480 Use all of the ColdFire CPU cache memory as a data cache.
485 Split the ColdFire CPU cache, and use half as an instruction cache
486 and half as a data cache.
492 prompt "Data cache mode"
493 default CACHE_WRITETHRU
495 config CACHE_WRITETHRU
498 The ColdFire CPU cache is set into Write-through mode.
500 config CACHE_COPYBACK
503 The ColdFire CPU cache is set into Copy-back mode.