[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.

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
ad8f955d GU	117	endif # M68KCLASSIC
	118
	119	if COLDFIRE
	120
fa95a1dd GU	121	choice
	122	prompt "ColdFire SoC type"
	123	default M520x
	124	help
	125	Select the type of ColdFire System-on-Chip (SoC) that you want
	126	to build for.
	127
0e152d80 GU	128	config M5206
	129	bool "MCF5206"
	130	depends on !MMU
0e152d80 GU	131	select COLDFIRE_SW_A7
	132	select HAVE_MBAR
	133	help
	134	Motorola ColdFire 5206 processor support.
	135
	136	config M5206e
	137	bool "MCF5206e"
	138	depends on !MMU
0e152d80 GU	139	select COLDFIRE_SW_A7
	140	select HAVE_MBAR
	141	help
	142	Motorola ColdFire 5206e processor support.
	143
	144	config M520x
	145	bool "MCF520x"
	146	depends on !MMU
0e152d80 GU	147	select GENERIC_CLOCKEVENTS
	148	select HAVE_CACHE_SPLIT
	149	help
	150	Freescale Coldfire 5207/5208 processor support.
	151
	152	config M523x
	153	bool "MCF523x"
	154	depends on !MMU
0e152d80 GU	155	select GENERIC_CLOCKEVENTS
	156	select HAVE_CACHE_SPLIT
	157	select HAVE_IPSBAR
	158	help
	159	Freescale Coldfire 5230/1/2/4/5 processor support
	160
	161	config M5249
	162	bool "MCF5249"
	163	depends on !MMU
0e152d80 GU	164	select COLDFIRE_SW_A7
	165	select HAVE_MBAR
	166	help
	167	Motorola ColdFire 5249 processor support.
	168
04e037aa SK	169	config M525x
	170	bool "MCF525x"
	171	depends on !MMU
	172	select COLDFIRE_SW_A7
	173	select HAVE_MBAR
	174	help
	175	Freescale (Motorola) Coldfire 5251/5253 processor support.
	176
0e152d80 GU	177	config M5271
	178	bool "MCF5271"
	179	depends on !MMU
0e152d80 GU	180	select M527x
	181	select HAVE_CACHE_SPLIT
	182	select HAVE_IPSBAR
	183	select GENERIC_CLOCKEVENTS
	184	help
	185	Freescale (Motorola) ColdFire 5270/5271 processor support.
	186
	187	config M5272
	188	bool "MCF5272"
	189	depends on !MMU
0e152d80 GU	190	select COLDFIRE_SW_A7
	191	select HAVE_MBAR
	192	help
	193	Motorola ColdFire 5272 processor support.
	194
	195	config M5275
	196	bool "MCF5275"
	197	depends on !MMU
0e152d80 GU	198	select M527x
	199	select HAVE_CACHE_SPLIT
	200	select HAVE_IPSBAR
	201	select GENERIC_CLOCKEVENTS
	202	help
	203	Freescale (Motorola) ColdFire 5274/5275 processor support.
	204
	205	config M528x
	206	bool "MCF528x"
	207	depends on !MMU
0e152d80 GU	208	select GENERIC_CLOCKEVENTS
	209	select HAVE_CACHE_SPLIT
	210	select HAVE_IPSBAR
	211	help
	212	Motorola ColdFire 5280/5282 processor support.
	213
	214	config M5307
	215	bool "MCF5307"
	216	depends on !MMU
0e152d80 GU	217	select COLDFIRE_SW_A7
	218	select HAVE_CACHE_CB
	219	select HAVE_MBAR
	220	help
	221	Motorola ColdFire 5307 processor support.
	222
	223	config M532x
	224	bool "MCF532x"
	225	depends on !MMU
6eac4027	226	select M53xx
0e152d80 GU	227	select HAVE_CACHE_CB
	228	help
	229	Freescale (Motorola) ColdFire 532x processor support.
	230
e9d9dc6a GU	231	config M537x
	232	bool "MCF537x"
	233	depends on !MMU
	234	select M53xx
	235	select HAVE_CACHE_CB
	236	help
	237	Freescale ColdFire 537x processor support.
	238
0e152d80 GU	239	config M5407
	240	bool "MCF5407"
	241	depends on !MMU
0e152d80 GU	242	select COLDFIRE_SW_A7
	243	select HAVE_CACHE_CB
	244	select HAVE_MBAR
	245	help
	246	Motorola ColdFire 5407 processor support.
	247
0e152d80 GU	248	config M547x
0e152d80 GU	249	bool "MCF547x"
0e152d80	250	select M54xx
1f7034b9	251	select MMU_COLDFIRE if MMU
0e152d80 GU	252	select HAVE_CACHE_CB
	253	select HAVE_MBAR
	254	help
	255	Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
	256
	257	config M548x
	258	bool "MCF548x"
1f7034b9	259	select MMU_COLDFIRE if MMU
0e152d80 GU	260	select M54xx
	261	select HAVE_CACHE_CB
	262	select HAVE_MBAR
	263	help
	264	Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
	265
bea8bcb1 SK	266	config M5441x
	267	bool "MCF5441x"
	268	depends on !MMU
	269	select GENERIC_CLOCKEVENTS
	270	select HAVE_CACHE_CB
	271	help
	272	Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
	273
fa95a1dd GU	274	endchoice
	275
	276	config M527x
	277	bool
	278
	279	config M53xx
	280	bool
	281
	282	config M54xx
	283	bool
	284
ad8f955d GU	285	endif # COLDFIRE
ad8f955d GU	286
0e152d80 GU	287
	288	comment "Processor Specific Options"
	289
	290	config M68KFPU_EMU
112f8b12	291	bool "Math emulation support"
0e152d80	292	depends on MMU
0e152d80 GU	293	help
	294	At some point in the future, this will cause floating-point math
	295	instructions to be emulated by the kernel on machines that lack a
	296	floating-point math coprocessor. Thrill-seekers and chronically
	297	sleep-deprived psychotic hacker types can say Y now, everyone else
	298	should probably wait a while.
	299
	300	config M68KFPU_EMU_EXTRAPREC
	301	bool "Math emulation extra precision"
	302	depends on M68KFPU_EMU
	303	help
	304	The fpu uses normally a few bit more during calculations for
	305	correct rounding, the emulator can (often) do the same but this
	306	extra calculation can cost quite some time, so you can disable
	307	it here. The emulator will then "only" calculate with a 64 bit
	308	mantissa and round slightly incorrect, what is more than enough
	309	for normal usage.
	310
	311	config M68KFPU_EMU_ONLY
	312	bool "Math emulation only kernel"
	313	depends on M68KFPU_EMU
	314	help
	315	This option prevents any floating-point instructions from being
	316	compiled into the kernel, thereby the kernel doesn't save any
	317	floating point context anymore during task switches, so this
	318	kernel will only be usable on machines without a floating-point
	319	math coprocessor. This makes the kernel a bit faster as no tests
	320	needs to be executed whether a floating-point instruction in the
	321	kernel should be executed or not.
	322
	323	config ADVANCED
	324	bool "Advanced configuration options"
	325	depends on MMU
	326	---help---
	327	This gives you access to some advanced options for the CPU. The
	328	defaults should be fine for most users, but these options may make
	329	it possible for you to improve performance somewhat if you know what
	330	you are doing.
	331
	332	Note that the answer to this question won't directly affect the
	333	kernel: saying N will just cause the configurator to skip all
	334	the questions about these options.
	335
	336	Most users should say N to this question.
	337
	338	config RMW_INSNS
	339	bool "Use read-modify-write instructions"
	340	depends on ADVANCED
	341	---help---
	342	This allows to use certain instructions that work with indivisible
	343	read-modify-write bus cycles. While this is faster than the
	344	workaround of disabling interrupts, it can conflict with DMA
	345	( = direct memory access) on many Amiga systems, and it is also said
	346	to destabilize other machines. It is very likely that this will
	347	cause serious problems on any Amiga or Atari Medusa if set. The only
	348	configuration where it should work are 68030-based Ataris, where it
	349	apparently improves performance. But you've been warned! Unless you
	350	really know what you are doing, say N. Try Y only if you're quite
	351	adventurous.
	352
	353	config SINGLE_MEMORY_CHUNK
	354	bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
	355	depends on MMU
	356	default y if SUN3
357	select NEED_MULTIPLE_NODES
358	help
359	Ignore all but the first contiguous chunk of physical memory for VM
360	purposes. This will save a few bytes kernel size and may speed up
361	some operations. Say N if not sure.
362
363	config ARCH_DISCONTIGMEM_ENABLE
364	def_bool MMU && !SINGLE_MEMORY_CHUNK
365
366	config 060_WRITETHROUGH
367	bool "Use write-through caching for 68060 supervisor accesses"
368	depends on ADVANCED && M68060
369	---help---
370	The 68060 generally uses copyback caching of recently accessed data.
371	Copyback caching means that memory writes will be held in an on-chip
372	cache and only written back to memory some time later. Saying Y
373	here will force supervisor (kernel) accesses to use writethrough
374	caching. Writethrough caching means that data is written to memory
375	straight away, so that cache and memory data always agree.
376	Writethrough caching is less efficient, but is needed for some
377	drivers on 68060 based systems where the 68060 bus snooping signal
378	is hardwired on. The 53c710 SCSI driver is known to suffer from
379	this problem.
380
381	config M68K_L2_CACHE
382	bool
383	depends on MAC
384	default y
385
386	config NODES_SHIFT
387	int
388	default "3"
389	depends on !SINGLE_MEMORY_CHUNK
390
022613e0 GU	391	config CPU_HAS_NO_BITFIELDS
	392	bool
	393
	394	config CPU_HAS_NO_MULDIV64
	395	bool
	396
9f1f1180 GU	397	config CPU_HAS_NO_UNALIGNED
	398	bool
	399
022613e0 GU	400	config CPU_HAS_ADDRESS_SPACES
	401	bool
	402
0e152d80 GU	403	config FPU
	404	bool
	405
	406	config COLDFIRE_SW_A7
	407	bool
	408
	409	config HAVE_CACHE_SPLIT
	410	bool
	411
	412	config HAVE_CACHE_CB
	413	bool
	414
	415	config HAVE_MBAR
	416	bool
	417
	418	config HAVE_IPSBAR
	419	bool
	420
0e152d80 GU	421	config CLOCK_FREQ
0e152d80 GU	422	int "Set the core clock frequency"
15c2ca4e GU	423	default "25000000" if M5206
	424	default "54000000" if M5206e
	425	default "166666666" if M520x
	426	default "140000000" if M5249
	427	default "150000000" if M527x \|\| M523x
	428	default "90000000" if M5307
	429	default "50000000" if M5407
	430	default "266000000" if M54xx
0e152d80	431	default "66666666"
d9ee4896	432	depends on COLDFIRE
0e152d80 GU	433	help
	434	Define the CPU clock frequency in use. This is the core clock
	435	frequency, it may or may not be the same as the external clock
	436	crystal fitted to your board. Some processors have an internal
	437	PLL and can have their frequency programmed at run time, others
	438	use internal dividers. In general the kernel won't setup a PLL
	439	if it is fitted (there are some exceptions). This value will be
	440	specific to the exact CPU that you are using.
	441
	442	config OLDMASK
	443	bool "Old mask 5307 (1H55J) silicon"
	444	depends on M5307
	445	help
	446	Build support for the older revision ColdFire 5307 silicon.
	447	Specifically this is the 1H55J mask revision.
	448
	449	if HAVE_CACHE_SPLIT
	450	choice
	451	prompt "Split Cache Configuration"
	452	default CACHE_I
	453
	454	config CACHE_I
	455	bool "Instruction"
	456	help
	457	Use all of the ColdFire CPU cache memory as an instruction cache.
	458
	459	config CACHE_D
	460	bool "Data"
	461	help
	462	Use all of the ColdFire CPU cache memory as a data cache.
	463
	464	config CACHE_BOTH
	465	bool "Both"
	466	help
	467	Split the ColdFire CPU cache, and use half as an instruction cache
	468	and half as a data cache.
	469	endchoice
	470	endif
	471
	472	if HAVE_CACHE_CB
	473	choice
	474	prompt "Data cache mode"
	475	default CACHE_WRITETHRU
	476
	477	config CACHE_WRITETHRU
	478	bool "Write-through"
	479	help
	480	The ColdFire CPU cache is set into Write-through mode.
	481
	482	config CACHE_COPYBACK
	483	bool "Copy-back"
	484	help
	485	The ColdFire CPU cache is set into Copy-back mode.
	486	endchoice
	487	endif
	488