[linux-2.6-block.git] / arch / m68k / Kconfig.cpu

comment "Processor Type"

choice
	prompt "CPU family support"
	default M68KCLASSIC if MMU
	default COLDFIRE if !MMU
	help
	  The Freescale (was Motorola) M68K family of processors implements
	  the full 68000 processor instruction set.
	  The Freescale ColdFire family of processors is a modern derivative
	  of the 68000 processor family. They are mainly targeted at embedded
	  applications, and are all System-On-Chip (SOC) devices, as opposed
	  to stand alone CPUs. They implement a subset of the original 68000
	  processor instruction set.
	  If you anticipate running this kernel on a computer with a classic
	  MC68xxx processor, select M68KCLASSIC.
	  If you anticipate running this kernel on a computer with a ColdFire
	  processor, select COLDFIRE.

config M68KCLASSIC
	bool "Classic M68K CPU family support"

config COLDFIRE
	bool "Coldfire CPU family support"
	select ARCH_REQUIRE_GPIOLIB
	select ARCH_HAVE_CUSTOM_GPIO_H
	select CPU_HAS_NO_BITFIELDS
	select CPU_HAS_NO_MULDIV64
	select GENERIC_CSUM
	select HAVE_CLK

endchoice

if M68KCLASSIC

config M68000
	bool "MC68000"
	depends on !MMU
	select CPU_HAS_NO_BITFIELDS
	select CPU_HAS_NO_MULDIV64
	select CPU_HAS_NO_UNALIGNED
	select GENERIC_CSUM
	help
	  The Freescale (was Motorola) 68000 CPU is the first generation of
	  the well known M68K family of processors. The CPU core as well as
	  being available as a stand alone CPU was also used in many
	  System-On-Chip devices (eg 68328, 68302, etc). It does not contain
	  a paging MMU.

config MCPU32
	bool
	select CPU_HAS_NO_BITFIELDS
	select CPU_HAS_NO_UNALIGNED
	help
	  The Freescale (was then Motorola) CPU32 is a CPU core that is
	  based on the 68020 processor. For the most part it is used in
	  System-On-Chip parts, and does not contain a paging MMU.

config M68020
	bool "68020 support"
	depends on MMU
	select CPU_HAS_ADDRESS_SPACES
	help
	  If you anticipate running this kernel on a computer with a MC68020
	  processor, say Y. Otherwise, say N. Note that the 68020 requires a
	  68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
	  Sun 3, which provides its own version.

config M68030
	bool "68030 support"
	depends on MMU && !MMU_SUN3
	select CPU_HAS_ADDRESS_SPACES
	help
	  If you anticipate running this kernel on a computer with a MC68030
	  processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
	  work, as it does not include an MMU (Memory Management Unit).

config M68040
	bool "68040 support"
	depends on MMU && !MMU_SUN3
	select CPU_HAS_ADDRESS_SPACES
	help
	  If you anticipate running this kernel on a computer with a MC68LC040
	  or MC68040 processor, say Y. Otherwise, say N. Note that an
	  MC68EC040 will not work, as it does not include an MMU (Memory
	  Management Unit).

config M68060
	bool "68060 support"
	depends on MMU && !MMU_SUN3
	select CPU_HAS_ADDRESS_SPACES
	help
	  If you anticipate running this kernel on a computer with a MC68060
	  processor, say Y. Otherwise, say N.

config M68328
	bool "MC68328"
	depends on !MMU
	select M68000
	help
	  Motorola 68328 processor support.

config M68EZ328
	bool "MC68EZ328"
	depends on !MMU
	select M68000
	help
	  Motorola 68EX328 processor support.

config M68VZ328
	bool "MC68VZ328"
	depends on !MMU
	select M68000
	help
	  Motorola 68VZ328 processor support.

config M68360
	bool "MC68360"
	depends on !MMU
	select MCPU32
	help
	  Motorola 68360 processor support.

endif # M68KCLASSIC

if COLDFIRE

choice
	prompt "ColdFire SoC type"
	default M520x
	help
	  Select the type of ColdFire System-on-Chip (SoC) that you want
	  to build for.

config M5206
	bool "MCF5206"
	depends on !MMU
	select COLDFIRE_SW_A7
	select HAVE_MBAR
	help
	  Motorola ColdFire 5206 processor support.

config M5206e
	bool "MCF5206e"
	depends on !MMU
	select COLDFIRE_SW_A7
	select HAVE_MBAR
	help
	  Motorola ColdFire 5206e processor support.

config M520x
	bool "MCF520x"
	depends on !MMU
	select GENERIC_CLOCKEVENTS
	select HAVE_CACHE_SPLIT
	help
	   Freescale Coldfire 5207/5208 processor support.

config M523x
	bool "MCF523x"
	depends on !MMU
	select GENERIC_CLOCKEVENTS
	select HAVE_CACHE_SPLIT
	select HAVE_IPSBAR
	help
	  Freescale Coldfire 5230/1/2/4/5 processor support

config M5249
	bool "MCF5249"
	depends on !MMU
	select COLDFIRE_SW_A7
	select HAVE_MBAR
	help
	  Motorola ColdFire 5249 processor support.

config M525x
	bool "MCF525x"
	depends on !MMU
	select COLDFIRE_SW_A7
	select HAVE_MBAR
	help
	  Freescale (Motorola) Coldfire 5251/5253 processor support.

config M5271
	bool "MCF5271"
	depends on !MMU
	select M527x
	select HAVE_CACHE_SPLIT
	select HAVE_IPSBAR
	select GENERIC_CLOCKEVENTS
	help
	  Freescale (Motorola) ColdFire 5270/5271 processor support.

config M5272
	bool "MCF5272"
	depends on !MMU
	select COLDFIRE_SW_A7
	select HAVE_MBAR
	help
	  Motorola ColdFire 5272 processor support.

config M5275
	bool "MCF5275"
	depends on !MMU
	select M527x
	select HAVE_CACHE_SPLIT
	select HAVE_IPSBAR
	select GENERIC_CLOCKEVENTS
	help
	  Freescale (Motorola) ColdFire 5274/5275 processor support.

config M528x
	bool "MCF528x"
	depends on !MMU
	select GENERIC_CLOCKEVENTS
	select HAVE_CACHE_SPLIT
	select HAVE_IPSBAR
	help
	  Motorola ColdFire 5280/5282 processor support.

config M5307
	bool "MCF5307"
	depends on !MMU
	select COLDFIRE_SW_A7
	select HAVE_CACHE_CB
	select HAVE_MBAR
	help
	  Motorola ColdFire 5307 processor support.

config M532x
	bool "MCF532x"
	depends on !MMU
	select M53xx
	select HAVE_CACHE_CB
	help
	  Freescale (Motorola) ColdFire 532x processor support.

config M537x
	bool "MCF537x"
	depends on !MMU
	select M53xx
	select HAVE_CACHE_CB
	help
	  Freescale ColdFire 537x processor support.

config M5407
	bool "MCF5407"
	depends on !MMU
	select COLDFIRE_SW_A7
	select HAVE_CACHE_CB
	select HAVE_MBAR
	help
	  Motorola ColdFire 5407 processor support.

config M547x
	bool "MCF547x"
	select M54xx
	select MMU_COLDFIRE if MMU
	select HAVE_CACHE_CB
	select HAVE_MBAR
	help
	  Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.

config M548x
	bool "MCF548x"
	select MMU_COLDFIRE if MMU
	select M54xx
	select HAVE_CACHE_CB
	select HAVE_MBAR
	help
	  Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.

config M5441x
	bool "MCF5441x"
	depends on !MMU
	select GENERIC_CLOCKEVENTS
	select HAVE_CACHE_CB
	help
	  Freescale Coldfire 54410/54415/54416/54417/54418 processor support.

endchoice

config M527x
	bool

config M53xx
	bool

config M54xx
	bool

endif # COLDFIRE


comment "Processor Specific Options"

config M68KFPU_EMU
	bool "Math emulation support"
	depends on MMU
	help
	  At some point in the future, this will cause floating-point math
	  instructions to be emulated by the kernel on machines that lack a
	  floating-point math coprocessor.  Thrill-seekers and chronically
	  sleep-deprived psychotic hacker types can say Y now, everyone else
	  should probably wait a while.

config M68KFPU_EMU_EXTRAPREC
	bool "Math emulation extra precision"
	depends on M68KFPU_EMU
	help
	  The fpu uses normally a few bit more during calculations for
	  correct rounding, the emulator can (often) do the same but this
	  extra calculation can cost quite some time, so you can disable
	  it here. The emulator will then "only" calculate with a 64 bit
	  mantissa and round slightly incorrect, what is more than enough
	  for normal usage.

config M68KFPU_EMU_ONLY
	bool "Math emulation only kernel"
	depends on M68KFPU_EMU
	help
	  This option prevents any floating-point instructions from being
	  compiled into the kernel, thereby the kernel doesn't save any
	  floating point context anymore during task switches, so this
	  kernel will only be usable on machines without a floating-point
	  math coprocessor. This makes the kernel a bit faster as no tests
	  needs to be executed whether a floating-point instruction in the
	  kernel should be executed or not.

config ADVANCED
	bool "Advanced configuration options"
	depends on MMU
	---help---
	  This gives you access to some advanced options for the CPU. The
	  defaults should be fine for most users, but these options may make
	  it possible for you to improve performance somewhat if you know what
	  you are doing.

	  Note that the answer to this question won't directly affect the
	  kernel: saying N will just cause the configurator to skip all
	  the questions about these options.

	  Most users should say N to this question.

config RMW_INSNS
	bool "Use read-modify-write instructions"
	depends on ADVANCED
	---help---
	  This allows to use certain instructions that work with indivisible
	  read-modify-write bus cycles. While this is faster than the
	  workaround of disabling interrupts, it can conflict with DMA
	  ( = direct memory access) on many Amiga systems, and it is also said
	  to destabilize other machines. It is very likely that this will
	  cause serious problems on any Amiga or Atari Medusa if set. The only
	  configuration where it should work are 68030-based Ataris, where it
	  apparently improves performance. But you've been warned! Unless you
	  really know what you are doing, say N. Try Y only if you're quite
	  adventurous.

config SINGLE_MEMORY_CHUNK
	bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
	depends on MMU
	default y if SUN3
	select NEED_MULTIPLE_NODES
	help
	  Ignore all but the first contiguous chunk of physical memory for VM
	  purposes.  This will save a few bytes kernel size and may speed up
	  some operations.  Say N if not sure.

config ARCH_DISCONTIGMEM_ENABLE
	def_bool MMU && !SINGLE_MEMORY_CHUNK

config 060_WRITETHROUGH
	bool "Use write-through caching for 68060 supervisor accesses"
	depends on ADVANCED && M68060
	---help---
	  The 68060 generally uses copyback caching of recently accessed data.
	  Copyback caching means that memory writes will be held in an on-chip
	  cache and only written back to memory some time later.  Saying Y
	  here will force supervisor (kernel) accesses to use writethrough
	  caching.  Writethrough caching means that data is written to memory
	  straight away, so that cache and memory data always agree.
	  Writethrough caching is less efficient, but is needed for some
	  drivers on 68060 based systems where the 68060 bus snooping signal
	  is hardwired on.  The 53c710 SCSI driver is known to suffer from
	  this problem.

config M68K_L2_CACHE
	bool
	depends on MAC
	default y

config NODES_SHIFT
	int
	default "3"
	depends on !SINGLE_MEMORY_CHUNK

config CPU_HAS_NO_BITFIELDS
	bool

config CPU_HAS_NO_MULDIV64
	bool

config CPU_HAS_NO_UNALIGNED
	bool

config CPU_HAS_ADDRESS_SPACES
	bool

config FPU
	bool

config COLDFIRE_SW_A7
	bool

config HAVE_CACHE_SPLIT
	bool

config HAVE_CACHE_CB
	bool

config HAVE_MBAR
	bool

config HAVE_IPSBAR
	bool

config CLOCK_FREQ
	int "Set the core clock frequency"
	default "25000000" if M5206
	default "54000000" if M5206e
	default "166666666" if M520x
	default "140000000" if M5249
	default "150000000" if M527x || M523x
	default "90000000" if M5307
	default "50000000" if M5407
	default "266000000" if M54xx
	default "66666666"
	depends on COLDFIRE
	help
	  Define the CPU clock frequency in use. This is the core clock
	  frequency, it may or may not be the same as the external clock
	  crystal fitted to your board. Some processors have an internal
	  PLL and can have their frequency programmed at run time, others
	  use internal dividers. In general the kernel won't setup a PLL
	  if it is fitted (there are some exceptions). This value will be
	  specific to the exact CPU that you are using.

config OLDMASK
	bool "Old mask 5307 (1H55J) silicon"
	depends on M5307
	help
	  Build support for the older revision ColdFire 5307 silicon.
	  Specifically this is the 1H55J mask revision.

if HAVE_CACHE_SPLIT
choice
	prompt "Split Cache Configuration"
	default CACHE_I

config CACHE_I
	bool "Instruction"
	help
	  Use all of the ColdFire CPU cache memory as an instruction cache.

config CACHE_D
	bool "Data"
	help
	  Use all of the ColdFire CPU cache memory as a data cache.

config CACHE_BOTH
	bool "Both"
	help
	  Split the ColdFire CPU cache, and use half as an instruction cache
	  and half as a data cache.
endchoice
endif

if HAVE_CACHE_CB
choice
	prompt "Data cache mode"
	default CACHE_WRITETHRU

config CACHE_WRITETHRU
	bool "Write-through"
	help
	  The ColdFire CPU cache is set into Write-through mode.

config CACHE_COPYBACK
	bool "Copy-back"
	help
	  The ColdFire CPU cache is set into Copy-back mode.
endchoice
endif
Commit	Line	Data
0e152d80 GU	1	comment "Processor Type"
0e152d80 GU	2
ad8f955d GU	3	choice
	4	prompt "CPU family support"
	5	default M68KCLASSIC if MMU
	6	default COLDFIRE if !MMU
	7	help
	8	The Freescale (was Motorola) M68K family of processors implements
	9	the full 68000 processor instruction set.
6b2aac42	10	The Freescale ColdFire family of processors is a modern derivative
ad8f955d GU	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.
	19
	20	config M68KCLASSIC
	21	bool "Classic M68K CPU family support"
	22
	23	config COLDFIRE
	24	bool "Coldfire CPU family support"
765278b7	25	select ARCH_REQUIRE_GPIOLIB
7563bbf8	26	select ARCH_HAVE_CUSTOM_GPIO_H
ad8f955d GU	27	select CPU_HAS_NO_BITFIELDS
	28	select CPU_HAS_NO_MULDIV64
	29	select GENERIC_CSUM
e7d6582e	30	select HAVE_CLK
ad8f955d GU	31
	32	endchoice
	33
	34	if M68KCLASSIC
	35
0e152d80	36	config M68000
4674e8d3	37	bool "MC68000"
9da1a84a	38	depends on !MMU
0e152d80	39	select CPU_HAS_NO_BITFIELDS
84f3fb7a	40	select CPU_HAS_NO_MULDIV64
9f1f1180	41	select CPU_HAS_NO_UNALIGNED
7f73bafc	42	select GENERIC_CSUM
0e152d80 GU	43	help
	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
	48	a paging MMU.
	49
	50	config MCPU32
	51	bool
	52	select CPU_HAS_NO_BITFIELDS
7df0d27f	53	select CPU_HAS_NO_UNALIGNED
0e152d80 GU	54	help
	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.
	58
0e152d80 GU	59	config M68020
	60	bool "68020 support"
	61	depends on MMU
e08d703c	62	select CPU_HAS_ADDRESS_SPACES
0e152d80 GU	63	help
	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.
	68
	69	config M68030
	70	bool "68030 support"
	71	depends on MMU && !MMU_SUN3
e08d703c	72	select CPU_HAS_ADDRESS_SPACES
0e152d80 GU	73	help
	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).
	77
	78	config M68040
	79	bool "68040 support"
	80	depends on MMU && !MMU_SUN3
e08d703c	81	select CPU_HAS_ADDRESS_SPACES
0e152d80 GU	82	help
	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
	86	Management Unit).
	87
	88	config M68060
	89	bool "68060 support"
	90	depends on MMU && !MMU_SUN3
e08d703c	91	select CPU_HAS_ADDRESS_SPACES
0e152d80 GU	92	help
	93	If you anticipate running this kernel on a computer with a MC68060
	94	processor, say Y. Otherwise, say N.
	95
	96	config M68328
	97	bool "MC68328"
	98	depends on !MMU
	99	select M68000
	100	help
	101	Motorola 68328 processor support.
	102
	103	config M68EZ328
	104	bool "MC68EZ328"
	105	depends on !MMU
	106	select M68000
	107	help
	108	Motorola 68EX328 processor support.
	109
	110	config M68VZ328
	111	bool "MC68VZ328"
	112	depends on !MMU
	113	select M68000
	114	help
	115	Motorola 68VZ328 processor support.
	116
	117	config M68360
	118	bool "MC68360"
	119	depends on !MMU
	120	select MCPU32
	121	help
	122	Motorola 68360 processor support.
	123
ad8f955d GU	124	endif # M68KCLASSIC
	125
	126	if COLDFIRE
	127
fa95a1dd GU	128	choice
	129	prompt "ColdFire SoC type"
	130	default M520x
	131	help
	132	Select the type of ColdFire System-on-Chip (SoC) that you want
	133	to build for.
	134
0e152d80 GU	135	config M5206
	136	bool "MCF5206"
	137	depends on !MMU
0e152d80 GU	138	select COLDFIRE_SW_A7
	139	select HAVE_MBAR
	140	help
	141	Motorola ColdFire 5206 processor support.
	142
	143	config M5206e
	144	bool "MCF5206e"
	145	depends on !MMU
0e152d80 GU	146	select COLDFIRE_SW_A7
	147	select HAVE_MBAR
	148	help
	149	Motorola ColdFire 5206e processor support.
	150
	151	config M520x
	152	bool "MCF520x"
	153	depends on !MMU
0e152d80 GU	154	select GENERIC_CLOCKEVENTS
	155	select HAVE_CACHE_SPLIT
	156	help
	157	Freescale Coldfire 5207/5208 processor support.
	158
	159	config M523x
	160	bool "MCF523x"
	161	depends on !MMU
0e152d80 GU	162	select GENERIC_CLOCKEVENTS
	163	select HAVE_CACHE_SPLIT
	164	select HAVE_IPSBAR
	165	help
	166	Freescale Coldfire 5230/1/2/4/5 processor support
	167
	168	config M5249
	169	bool "MCF5249"
	170	depends on !MMU
0e152d80 GU	171	select COLDFIRE_SW_A7
	172	select HAVE_MBAR
	173	help
	174	Motorola ColdFire 5249 processor support.
	175
04e037aa SK	176	config M525x
	177	bool "MCF525x"
	178	depends on !MMU
	179	select COLDFIRE_SW_A7
	180	select HAVE_MBAR
	181	help
	182	Freescale (Motorola) Coldfire 5251/5253 processor support.
	183
0e152d80 GU	184	config M5271
	185	bool "MCF5271"
	186	depends on !MMU
0e152d80 GU	187	select M527x
	188	select HAVE_CACHE_SPLIT
	189	select HAVE_IPSBAR
	190	select GENERIC_CLOCKEVENTS
	191	help
	192	Freescale (Motorola) ColdFire 5270/5271 processor support.
	193
	194	config M5272
	195	bool "MCF5272"
	196	depends on !MMU
0e152d80 GU	197	select COLDFIRE_SW_A7
	198	select HAVE_MBAR
	199	help
	200	Motorola ColdFire 5272 processor support.
	201
	202	config M5275
	203	bool "MCF5275"
	204	depends on !MMU
0e152d80 GU	205	select M527x
	206	select HAVE_CACHE_SPLIT
	207	select HAVE_IPSBAR
	208	select GENERIC_CLOCKEVENTS
	209	help
	210	Freescale (Motorola) ColdFire 5274/5275 processor support.
	211
	212	config M528x
	213	bool "MCF528x"
	214	depends on !MMU
0e152d80 GU	215	select GENERIC_CLOCKEVENTS
	216	select HAVE_CACHE_SPLIT
	217	select HAVE_IPSBAR
	218	help
	219	Motorola ColdFire 5280/5282 processor support.
	220
	221	config M5307
	222	bool "MCF5307"
	223	depends on !MMU
0e152d80 GU	224	select COLDFIRE_SW_A7
	225	select HAVE_CACHE_CB
	226	select HAVE_MBAR
	227	help
	228	Motorola ColdFire 5307 processor support.
	229
	230	config M532x
	231	bool "MCF532x"
	232	depends on !MMU
6eac4027	233	select M53xx
0e152d80 GU	234	select HAVE_CACHE_CB
	235	help
	236	Freescale (Motorola) ColdFire 532x processor support.
	237
e9d9dc6a GU	238	config M537x
	239	bool "MCF537x"
	240	depends on !MMU
	241	select M53xx
	242	select HAVE_CACHE_CB
	243	help
	244	Freescale ColdFire 537x processor support.
	245
0e152d80 GU	246	config M5407
	247	bool "MCF5407"
	248	depends on !MMU
0e152d80 GU	249	select COLDFIRE_SW_A7
	250	select HAVE_CACHE_CB
	251	select HAVE_MBAR
	252	help
	253	Motorola ColdFire 5407 processor support.
	254
0e152d80 GU	255	config M547x
0e152d80 GU	256	bool "MCF547x"
0e152d80	257	select M54xx
1f7034b9	258	select MMU_COLDFIRE if MMU
0e152d80 GU	259	select HAVE_CACHE_CB
	260	select HAVE_MBAR
	261	help
	262	Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
	263
	264	config M548x
	265	bool "MCF548x"
1f7034b9	266	select MMU_COLDFIRE if MMU
0e152d80 GU	267	select M54xx
	268	select HAVE_CACHE_CB
	269	select HAVE_MBAR
	270	help
	271	Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
	272
bea8bcb1 SK	273	config M5441x
	274	bool "MCF5441x"
	275	depends on !MMU
	276	select GENERIC_CLOCKEVENTS
	277	select HAVE_CACHE_CB
	278	help
	279	Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
	280
fa95a1dd GU	281	endchoice
	282
	283	config M527x
	284	bool
	285
	286	config M53xx
	287	bool
	288
	289	config M54xx
	290	bool
	291
ad8f955d GU	292	endif # COLDFIRE
ad8f955d GU	293
0e152d80 GU	294
	295	comment "Processor Specific Options"
	296
	297	config M68KFPU_EMU
112f8b12	298	bool "Math emulation support"
0e152d80	299	depends on MMU
0e152d80 GU	300	help
	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.
	306
	307	config M68KFPU_EMU_EXTRAPREC
	308	bool "Math emulation extra precision"
	309	depends on M68KFPU_EMU
	310	help
	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
	316	for normal usage.
	317
	318	config M68KFPU_EMU_ONLY
	319	bool "Math emulation only kernel"
	320	depends on M68KFPU_EMU
	321	help
	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.
	329
	330	config ADVANCED
	331	bool "Advanced configuration options"
	332	depends on MMU
	333	---help---
	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
	337	you are doing.
	338
	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.
	342
	343	Most users should say N to this question.
	344
	345	config RMW_INSNS
	346	bool "Use read-modify-write instructions"
	347	depends on ADVANCED
	348	---help---
	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
	358	adventurous.
	359
	360	config SINGLE_MEMORY_CHUNK
	361	bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
	362	depends on MMU
	363	default y if SUN3
364	select NEED_MULTIPLE_NODES
365	help
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.
369
370	config ARCH_DISCONTIGMEM_ENABLE
371	def_bool MMU && !SINGLE_MEMORY_CHUNK
372
373	config 060_WRITETHROUGH
374	bool "Use write-through caching for 68060 supervisor accesses"
375	depends on ADVANCED && M68060
376	---help---
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
386	this problem.
387
388	config M68K_L2_CACHE
389	bool
390	depends on MAC
391	default y
392
393	config NODES_SHIFT
394	int
395	default "3"
396	depends on !SINGLE_MEMORY_CHUNK
397
022613e0 GU	398	config CPU_HAS_NO_BITFIELDS
	399	bool
	400
	401	config CPU_HAS_NO_MULDIV64
	402	bool
	403
9f1f1180 GU	404	config CPU_HAS_NO_UNALIGNED
	405	bool
	406
022613e0 GU	407	config CPU_HAS_ADDRESS_SPACES
	408	bool
	409
0e152d80 GU	410	config FPU
	411	bool
	412
	413	config COLDFIRE_SW_A7
	414	bool
	415
	416	config HAVE_CACHE_SPLIT
	417	bool
	418
	419	config HAVE_CACHE_CB
	420	bool
	421
	422	config HAVE_MBAR
	423	bool
	424
	425	config HAVE_IPSBAR
	426	bool
	427
0e152d80 GU	428	config CLOCK_FREQ
0e152d80 GU	429	int "Set the core clock frequency"
15c2ca4e GU	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
0e152d80	438	default "66666666"
d9ee4896	439	depends on COLDFIRE
0e152d80 GU	440	help
	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.
	448
	449	config OLDMASK
	450	bool "Old mask 5307 (1H55J) silicon"
	451	depends on M5307
	452	help
	453	Build support for the older revision ColdFire 5307 silicon.
	454	Specifically this is the 1H55J mask revision.
	455
	456	if HAVE_CACHE_SPLIT
	457	choice
	458	prompt "Split Cache Configuration"
	459	default CACHE_I
	460
	461	config CACHE_I
	462	bool "Instruction"
	463	help
	464	Use all of the ColdFire CPU cache memory as an instruction cache.
	465
	466	config CACHE_D
	467	bool "Data"
	468	help
	469	Use all of the ColdFire CPU cache memory as a data cache.
	470
	471	config CACHE_BOTH
	472	bool "Both"
	473	help
	474	Split the ColdFire CPU cache, and use half as an instruction cache
	475	and half as a data cache.
	476	endchoice
	477	endif
	478
	479	if HAVE_CACHE_CB
	480	choice
	481	prompt "Data cache mode"
	482	default CACHE_WRITETHRU
	483
	484	config CACHE_WRITETHRU
	485	bool "Write-through"
	486	help
	487	The ColdFire CPU cache is set into Write-through mode.
	488
	489	config CACHE_COPYBACK
	490	bool "Copy-back"
	491	help
	492	The ColdFire CPU cache is set into Copy-back mode.
	493	endchoice
	494	endif
	495