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
45 The Freescale (was Motorola) 68000 CPU is the first generation of
46 the well known M68K family of processors. The CPU core as well as
47 being available as a stand alone CPU was also used in many
48 System-On-Chip devices (eg 68328, 68302, etc). It does not contain
53 select CPU_HAS_NO_BITFIELDS
54 select CPU_HAS_NO_UNALIGNED
55 select CPU_NO_EFFICIENT_FFS
57 The Freescale (was then Motorola) CPU32 is a CPU core that is
58 based on the 68020 processor. For the most part it is used in
59 System-On-Chip parts, and does not contain a paging MMU.
64 select CPU_HAS_ADDRESS_SPACES
66 If you anticipate running this kernel on a computer with a MC68020
67 processor, say Y. Otherwise, say N. Note that the 68020 requires a
68 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
69 Sun 3, which provides its own version.
73 depends on MMU && !MMU_SUN3
74 select CPU_HAS_ADDRESS_SPACES
76 If you anticipate running this kernel on a computer with a MC68030
77 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
78 work, as it does not include an MMU (Memory Management Unit).
82 depends on MMU && !MMU_SUN3
83 select CPU_HAS_ADDRESS_SPACES
85 If you anticipate running this kernel on a computer with a MC68LC040
86 or MC68040 processor, say Y. Otherwise, say N. Note that an
87 MC68EC040 will not work, as it does not include an MMU (Memory
92 depends on MMU && !MMU_SUN3
93 select CPU_HAS_ADDRESS_SPACES
95 If you anticipate running this kernel on a computer with a MC68060
96 processor, say Y. Otherwise, say N.
103 Motorola 68328 processor support.
110 Motorola 68EX328 processor support.
117 Motorola 68VZ328 processor support.
124 prompt "ColdFire SoC type"
127 Select the type of ColdFire System-on-Chip (SoC) that you want
133 select COLDFIRE_SW_A7
135 select CPU_NO_EFFICIENT_FFS
137 Motorola ColdFire 5206 processor support.
142 select COLDFIRE_SW_A7
144 select CPU_NO_EFFICIENT_FFS
146 Motorola ColdFire 5206e processor support.
151 select GENERIC_CLOCKEVENTS
152 select HAVE_CACHE_SPLIT
154 Freescale Coldfire 5207/5208 processor support.
159 select GENERIC_CLOCKEVENTS
160 select HAVE_CACHE_SPLIT
163 Freescale Coldfire 5230/1/2/4/5 processor support
168 select COLDFIRE_SW_A7
170 select CPU_NO_EFFICIENT_FFS
172 Motorola ColdFire 5249 processor support.
177 select COLDFIRE_SW_A7
179 select CPU_NO_EFFICIENT_FFS
181 Freescale (Motorola) Coldfire 5251/5253 processor support.
187 select HAVE_CACHE_SPLIT
189 select GENERIC_CLOCKEVENTS
191 Freescale (Motorola) ColdFire 5270/5271 processor support.
196 select COLDFIRE_SW_A7
198 select CPU_NO_EFFICIENT_FFS
200 Motorola ColdFire 5272 processor support.
206 select HAVE_CACHE_SPLIT
208 select GENERIC_CLOCKEVENTS
210 Freescale (Motorola) ColdFire 5274/5275 processor support.
215 select GENERIC_CLOCKEVENTS
216 select HAVE_CACHE_SPLIT
219 Motorola ColdFire 5280/5282 processor support.
224 select COLDFIRE_SW_A7
227 select CPU_NO_EFFICIENT_FFS
229 Motorola ColdFire 5307 processor support.
237 Freescale (Motorola) ColdFire 532x processor support.
245 Freescale ColdFire 537x processor support.
250 select COLDFIRE_SW_A7
253 select CPU_NO_EFFICIENT_FFS
255 Motorola ColdFire 5407 processor support.
260 select MMU_COLDFIRE if MMU
263 select CPU_NO_EFFICIENT_FFS
265 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
269 select MMU_COLDFIRE if MMU
273 select CPU_NO_EFFICIENT_FFS
275 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
280 select GENERIC_CLOCKEVENTS
283 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
299 comment "Processor Specific Options"
302 bool "Math emulation support"
305 At some point in the future, this will cause floating-point math
306 instructions to be emulated by the kernel on machines that lack a
307 floating-point math coprocessor. Thrill-seekers and chronically
308 sleep-deprived psychotic hacker types can say Y now, everyone else
309 should probably wait a while.
311 config M68KFPU_EMU_EXTRAPREC
312 bool "Math emulation extra precision"
313 depends on M68KFPU_EMU
315 The fpu uses normally a few bit more during calculations for
316 correct rounding, the emulator can (often) do the same but this
317 extra calculation can cost quite some time, so you can disable
318 it here. The emulator will then "only" calculate with a 64 bit
319 mantissa and round slightly incorrect, what is more than enough
322 config M68KFPU_EMU_ONLY
323 bool "Math emulation only kernel"
324 depends on M68KFPU_EMU
326 This option prevents any floating-point instructions from being
327 compiled into the kernel, thereby the kernel doesn't save any
328 floating point context anymore during task switches, so this
329 kernel will only be usable on machines without a floating-point
330 math coprocessor. This makes the kernel a bit faster as no tests
331 needs to be executed whether a floating-point instruction in the
332 kernel should be executed or not.
335 bool "Advanced configuration options"
338 This gives you access to some advanced options for the CPU. The
339 defaults should be fine for most users, but these options may make
340 it possible for you to improve performance somewhat if you know what
343 Note that the answer to this question won't directly affect the
344 kernel: saying N will just cause the configurator to skip all
345 the questions about these options.
347 Most users should say N to this question.
350 bool "Use read-modify-write instructions"
353 This allows to use certain instructions that work with indivisible
354 read-modify-write bus cycles. While this is faster than the
355 workaround of disabling interrupts, it can conflict with DMA
356 ( = direct memory access) on many Amiga systems, and it is also said
357 to destabilize other machines. It is very likely that this will
358 cause serious problems on any Amiga or Atari Medusa if set. The only
359 configuration where it should work are 68030-based Ataris, where it
360 apparently improves performance. But you've been warned! Unless you
361 really know what you are doing, say N. Try Y only if you're quite
364 config SINGLE_MEMORY_CHUNK
365 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
368 select NEED_MULTIPLE_NODES
370 Ignore all but the first contiguous chunk of physical memory for VM
371 purposes. This will save a few bytes kernel size and may speed up
372 some operations. Say N if not sure.
374 config ARCH_DISCONTIGMEM_ENABLE
375 def_bool MMU && !SINGLE_MEMORY_CHUNK
377 config 060_WRITETHROUGH
378 bool "Use write-through caching for 68060 supervisor accesses"
379 depends on ADVANCED && M68060
381 The 68060 generally uses copyback caching of recently accessed data.
382 Copyback caching means that memory writes will be held in an on-chip
383 cache and only written back to memory some time later. Saying Y
384 here will force supervisor (kernel) accesses to use writethrough
385 caching. Writethrough caching means that data is written to memory
386 straight away, so that cache and memory data always agree.
387 Writethrough caching is less efficient, but is needed for some
388 drivers on 68060 based systems where the 68060 bus snooping signal
389 is hardwired on. The 53c710 SCSI driver is known to suffer from
400 depends on !SINGLE_MEMORY_CHUNK
402 config CPU_HAS_NO_BITFIELDS
405 config CPU_HAS_NO_MULDIV64
408 config CPU_HAS_NO_UNALIGNED
411 config CPU_HAS_ADDRESS_SPACES
417 config COLDFIRE_SW_A7
420 config HAVE_CACHE_SPLIT
433 int "Set the core clock frequency"
434 default "25000000" if M5206
435 default "54000000" if M5206e
436 default "166666666" if M520x
437 default "140000000" if M5249
438 default "150000000" if M527x || M523x
439 default "90000000" if M5307
440 default "50000000" if M5407
441 default "266000000" if M54xx
445 Define the CPU clock frequency in use. This is the core clock
446 frequency, it may or may not be the same as the external clock
447 crystal fitted to your board. Some processors have an internal
448 PLL and can have their frequency programmed at run time, others
449 use internal dividers. In general the kernel won't setup a PLL
450 if it is fitted (there are some exceptions). This value will be
451 specific to the exact CPU that you are using.
454 bool "Old mask 5307 (1H55J) silicon"
457 Build support for the older revision ColdFire 5307 silicon.
458 Specifically this is the 1H55J mask revision.
462 prompt "Split Cache Configuration"
468 Use all of the ColdFire CPU cache memory as an instruction cache.
473 Use all of the ColdFire CPU cache memory as a data cache.
478 Split the ColdFire CPU cache, and use half as an instruction cache
479 and half as a data cache.
485 prompt "Data cache mode"
486 default CACHE_WRITETHRU
488 config CACHE_WRITETHRU
491 The ColdFire CPU cache is set into Write-through mode.
493 config CACHE_COPYBACK
496 The ColdFire CPU cache is set into Copy-back mode.