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 Motorola 68360 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
141 Motorola ColdFire 5206 processor support.
146 select COLDFIRE_SW_A7
149 Motorola ColdFire 5206e processor support.
154 select GENERIC_CLOCKEVENTS
155 select HAVE_CACHE_SPLIT
157 Freescale Coldfire 5207/5208 processor support.
162 select GENERIC_CLOCKEVENTS
163 select HAVE_CACHE_SPLIT
166 Freescale Coldfire 5230/1/2/4/5 processor support
171 select COLDFIRE_SW_A7
174 Motorola ColdFire 5249 processor support.
179 select COLDFIRE_SW_A7
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
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
228 Motorola ColdFire 5307 processor support.
236 Freescale (Motorola) ColdFire 532x processor support.
244 Freescale ColdFire 537x processor support.
249 select COLDFIRE_SW_A7
253 Motorola ColdFire 5407 processor support.
258 select MMU_COLDFIRE if MMU
262 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
266 select MMU_COLDFIRE if MMU
271 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
276 select GENERIC_CLOCKEVENTS
279 Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
295 comment "Processor Specific Options"
298 bool "Math emulation support"
301 At some point in the future, this will cause floating-point math
302 instructions to be emulated by the kernel on machines that lack a
303 floating-point math coprocessor. Thrill-seekers and chronically
304 sleep-deprived psychotic hacker types can say Y now, everyone else
305 should probably wait a while.
307 config M68KFPU_EMU_EXTRAPREC
308 bool "Math emulation extra precision"
309 depends on M68KFPU_EMU
311 The fpu uses normally a few bit more during calculations for
312 correct rounding, the emulator can (often) do the same but this
313 extra calculation can cost quite some time, so you can disable
314 it here. The emulator will then "only" calculate with a 64 bit
315 mantissa and round slightly incorrect, what is more than enough
318 config M68KFPU_EMU_ONLY
319 bool "Math emulation only kernel"
320 depends on M68KFPU_EMU
322 This option prevents any floating-point instructions from being
323 compiled into the kernel, thereby the kernel doesn't save any
324 floating point context anymore during task switches, so this
325 kernel will only be usable on machines without a floating-point
326 math coprocessor. This makes the kernel a bit faster as no tests
327 needs to be executed whether a floating-point instruction in the
328 kernel should be executed or not.
331 bool "Advanced configuration options"
334 This gives you access to some advanced options for the CPU. The
335 defaults should be fine for most users, but these options may make
336 it possible for you to improve performance somewhat if you know what
339 Note that the answer to this question won't directly affect the
340 kernel: saying N will just cause the configurator to skip all
341 the questions about these options.
343 Most users should say N to this question.
346 bool "Use read-modify-write instructions"
349 This allows to use certain instructions that work with indivisible
350 read-modify-write bus cycles. While this is faster than the
351 workaround of disabling interrupts, it can conflict with DMA
352 ( = direct memory access) on many Amiga systems, and it is also said
353 to destabilize other machines. It is very likely that this will
354 cause serious problems on any Amiga or Atari Medusa if set. The only
355 configuration where it should work are 68030-based Ataris, where it
356 apparently improves performance. But you've been warned! Unless you
357 really know what you are doing, say N. Try Y only if you're quite
360 config SINGLE_MEMORY_CHUNK
361 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
364 select NEED_MULTIPLE_NODES
366 Ignore all but the first contiguous chunk of physical memory for VM
367 purposes. This will save a few bytes kernel size and may speed up
368 some operations. Say N if not sure.
370 config ARCH_DISCONTIGMEM_ENABLE
371 def_bool MMU && !SINGLE_MEMORY_CHUNK
373 config 060_WRITETHROUGH
374 bool "Use write-through caching for 68060 supervisor accesses"
375 depends on ADVANCED && M68060
377 The 68060 generally uses copyback caching of recently accessed data.
378 Copyback caching means that memory writes will be held in an on-chip
379 cache and only written back to memory some time later. Saying Y
380 here will force supervisor (kernel) accesses to use writethrough
381 caching. Writethrough caching means that data is written to memory
382 straight away, so that cache and memory data always agree.
383 Writethrough caching is less efficient, but is needed for some
384 drivers on 68060 based systems where the 68060 bus snooping signal
385 is hardwired on. The 53c710 SCSI driver is known to suffer from
396 depends on !SINGLE_MEMORY_CHUNK
398 config CPU_HAS_NO_BITFIELDS
401 config CPU_HAS_NO_MULDIV64
404 config CPU_HAS_NO_UNALIGNED
407 config CPU_HAS_ADDRESS_SPACES
413 config COLDFIRE_SW_A7
416 config HAVE_CACHE_SPLIT
429 int "Set the core clock frequency"
430 default "25000000" if M5206
431 default "54000000" if M5206e
432 default "166666666" if M520x
433 default "140000000" if M5249
434 default "150000000" if M527x || M523x
435 default "90000000" if M5307
436 default "50000000" if M5407
437 default "266000000" if M54xx
441 Define the CPU clock frequency in use. This is the core clock
442 frequency, it may or may not be the same as the external clock
443 crystal fitted to your board. Some processors have an internal
444 PLL and can have their frequency programmed at run time, others
445 use internal dividers. In general the kernel won't setup a PLL
446 if it is fitted (there are some exceptions). This value will be
447 specific to the exact CPU that you are using.
450 bool "Old mask 5307 (1H55J) silicon"
453 Build support for the older revision ColdFire 5307 silicon.
454 Specifically this is the 1H55J mask revision.
458 prompt "Split Cache Configuration"
464 Use all of the ColdFire CPU cache memory as an instruction cache.
469 Use all of the ColdFire CPU cache memory as a data cache.
474 Split the ColdFire CPU cache, and use half as an instruction cache
475 and half as a data cache.
481 prompt "Data cache mode"
482 default CACHE_WRITETHRU
484 config CACHE_WRITETHRU
487 The ColdFire CPU cache is set into Write-through mode.
489 config CACHE_COPYBACK
492 The ColdFire CPU cache is set into Copy-back mode.