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
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
56 The Freescale (was then Motorola) CPU32 is a CPU core that is
57 based on the 68020 processor. For the most part it is used in
58 System-On-Chip parts, and does not contain a paging MMU.
63 select CPU_HAS_ADDRESS_SPACES
65 If you anticipate running this kernel on a computer with a MC68020
66 processor, say Y. Otherwise, say N. Note that the 68020 requires a
67 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
68 Sun 3, which provides its own version.
72 depends on MMU && !MMU_SUN3
73 select CPU_HAS_ADDRESS_SPACES
75 If you anticipate running this kernel on a computer with a MC68030
76 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
77 work, as it does not include an MMU (Memory Management Unit).
81 depends on MMU && !MMU_SUN3
82 select CPU_HAS_ADDRESS_SPACES
84 If you anticipate running this kernel on a computer with a MC68LC040
85 or MC68040 processor, say Y. Otherwise, say N. Note that an
86 MC68EC040 will not work, as it does not include an MMU (Memory
91 depends on MMU && !MMU_SUN3
92 select CPU_HAS_ADDRESS_SPACES
94 If you anticipate running this kernel on a computer with a MC68060
95 processor, say Y. Otherwise, say N.
102 Motorola 68328 processor support.
109 Motorola 68EX328 processor support.
116 Motorola 68VZ328 processor support.
123 prompt "ColdFire SoC type"
126 Select the type of ColdFire System-on-Chip (SoC) that you want
132 select COLDFIRE_SW_A7
135 Motorola ColdFire 5206 processor support.
140 select COLDFIRE_SW_A7
143 Motorola ColdFire 5206e processor support.
148 select GENERIC_CLOCKEVENTS
149 select HAVE_CACHE_SPLIT
151 Freescale Coldfire 5207/5208 processor support.
156 select GENERIC_CLOCKEVENTS
157 select HAVE_CACHE_SPLIT
160 Freescale Coldfire 5230/1/2/4/5 processor support
165 select COLDFIRE_SW_A7
168 Motorola ColdFire 5249 processor support.
173 select COLDFIRE_SW_A7
176 Freescale (Motorola) Coldfire 5251/5253 processor support.
182 select HAVE_CACHE_SPLIT
184 select GENERIC_CLOCKEVENTS
186 Freescale (Motorola) ColdFire 5270/5271 processor support.
191 select COLDFIRE_SW_A7
194 Motorola ColdFire 5272 processor support.
200 select HAVE_CACHE_SPLIT
202 select GENERIC_CLOCKEVENTS
204 Freescale (Motorola) ColdFire 5274/5275 processor support.
209 select GENERIC_CLOCKEVENTS
210 select HAVE_CACHE_SPLIT
213 Motorola ColdFire 5280/5282 processor support.
218 select COLDFIRE_SW_A7
222 Motorola ColdFire 5307 processor support.
230 Freescale (Motorola) ColdFire 532x processor support.
238 Freescale ColdFire 537x processor support.
243 select COLDFIRE_SW_A7
247 Motorola ColdFire 5407 processor support.
252 select MMU_COLDFIRE if MMU
256 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
260 select MMU_COLDFIRE if MMU
265 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
270 select GENERIC_CLOCKEVENTS
273 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
289 comment "Processor Specific Options"
292 bool "Math emulation support"
295 At some point in the future, this will cause floating-point math
296 instructions to be emulated by the kernel on machines that lack a
297 floating-point math coprocessor. Thrill-seekers and chronically
298 sleep-deprived psychotic hacker types can say Y now, everyone else
299 should probably wait a while.
301 config M68KFPU_EMU_EXTRAPREC
302 bool "Math emulation extra precision"
303 depends on M68KFPU_EMU
305 The fpu uses normally a few bit more during calculations for
306 correct rounding, the emulator can (often) do the same but this
307 extra calculation can cost quite some time, so you can disable
308 it here. The emulator will then "only" calculate with a 64 bit
309 mantissa and round slightly incorrect, what is more than enough
312 config M68KFPU_EMU_ONLY
313 bool "Math emulation only kernel"
314 depends on M68KFPU_EMU
316 This option prevents any floating-point instructions from being
317 compiled into the kernel, thereby the kernel doesn't save any
318 floating point context anymore during task switches, so this
319 kernel will only be usable on machines without a floating-point
320 math coprocessor. This makes the kernel a bit faster as no tests
321 needs to be executed whether a floating-point instruction in the
322 kernel should be executed or not.
325 bool "Advanced configuration options"
328 This gives you access to some advanced options for the CPU. The
329 defaults should be fine for most users, but these options may make
330 it possible for you to improve performance somewhat if you know what
333 Note that the answer to this question won't directly affect the
334 kernel: saying N will just cause the configurator to skip all
335 the questions about these options.
337 Most users should say N to this question.
340 bool "Use read-modify-write instructions"
343 This allows to use certain instructions that work with indivisible
344 read-modify-write bus cycles. While this is faster than the
345 workaround of disabling interrupts, it can conflict with DMA
346 ( = direct memory access) on many Amiga systems, and it is also said
347 to destabilize other machines. It is very likely that this will
348 cause serious problems on any Amiga or Atari Medusa if set. The only
349 configuration where it should work are 68030-based Ataris, where it
350 apparently improves performance. But you've been warned! Unless you
351 really know what you are doing, say N. Try Y only if you're quite
354 config SINGLE_MEMORY_CHUNK
355 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
358 select NEED_MULTIPLE_NODES
360 Ignore all but the first contiguous chunk of physical memory for VM
361 purposes. This will save a few bytes kernel size and may speed up
362 some operations. Say N if not sure.
364 config ARCH_DISCONTIGMEM_ENABLE
365 def_bool MMU && !SINGLE_MEMORY_CHUNK
367 config 060_WRITETHROUGH
368 bool "Use write-through caching for 68060 supervisor accesses"
369 depends on ADVANCED && M68060
371 The 68060 generally uses copyback caching of recently accessed data.
372 Copyback caching means that memory writes will be held in an on-chip
373 cache and only written back to memory some time later. Saying Y
374 here will force supervisor (kernel) accesses to use writethrough
375 caching. Writethrough caching means that data is written to memory
376 straight away, so that cache and memory data always agree.
377 Writethrough caching is less efficient, but is needed for some
378 drivers on 68060 based systems where the 68060 bus snooping signal
379 is hardwired on. The 53c710 SCSI driver is known to suffer from
390 depends on !SINGLE_MEMORY_CHUNK
392 config CPU_HAS_NO_BITFIELDS
395 config CPU_HAS_NO_MULDIV64
398 config CPU_HAS_NO_UNALIGNED
401 config CPU_HAS_ADDRESS_SPACES
407 config COLDFIRE_SW_A7
410 config HAVE_CACHE_SPLIT
423 int "Set the core clock frequency"
424 default "25000000" if M5206
425 default "54000000" if M5206e
426 default "166666666" if M520x
427 default "140000000" if M5249
428 default "150000000" if M527x || M523x
429 default "90000000" if M5307
430 default "50000000" if M5407
431 default "266000000" if M54xx
435 Define the CPU clock frequency in use. This is the core clock
436 frequency, it may or may not be the same as the external clock
437 crystal fitted to your board. Some processors have an internal
438 PLL and can have their frequency programmed at run time, others
439 use internal dividers. In general the kernel won't setup a PLL
440 if it is fitted (there are some exceptions). This value will be
441 specific to the exact CPU that you are using.
444 bool "Old mask 5307 (1H55J) silicon"
447 Build support for the older revision ColdFire 5307 silicon.
448 Specifically this is the 1H55J mask revision.
452 prompt "Split Cache Configuration"
458 Use all of the ColdFire CPU cache memory as an instruction cache.
463 Use all of the ColdFire CPU cache memory as a data cache.
468 Split the ColdFire CPU cache, and use half as an instruction cache
469 and half as a data cache.
475 prompt "Data cache mode"
476 default CACHE_WRITETHRU
478 config CACHE_WRITETHRU
481 The ColdFire CPU cache is set into Write-through mode.
483 config CACHE_COPYBACK
486 The ColdFire CPU cache is set into Copy-back mode.