arch/m68k/Kconfig.cpu

   1 comment "Processor Type"
   2
   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.
  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.
  19
  20 config M68KCLASSIC
  21         bool "Classic M68K CPU family support"
  22
  23 config COLDFIRE
  24         bool "Coldfire CPU family support"
  25         select GENERIC_GPIO
  26         select ARCH_REQUIRE_GPIOLIB
  27         select ARCH_HAVE_CUSTOM_GPIO_H
  28         select CPU_HAS_NO_BITFIELDS
  29         select CPU_HAS_NO_MULDIV64
  30         select GENERIC_CSUM
  31
  32 endchoice
  33
  34 if M68KCLASSIC
  35
  36 config M68000
  37         bool
  38         select CPU_HAS_NO_BITFIELDS
  39         select CPU_HAS_NO_MULDIV64
  40         select GENERIC_CSUM
  41         help
  42           The Freescale (was Motorola) 68000 CPU is the first generation of
  43           the well known M68K family of processors. The CPU core as well as
  44           being available as a stand alone CPU was also used in many
  45           System-On-Chip devices (eg 68328, 68302, etc). It does not contain
  46           a paging MMU.
  47
  48 config MCPU32
  49         bool
  50         select CPU_HAS_NO_BITFIELDS
  51         help
  52           The Freescale (was then Motorola) CPU32 is a CPU core that is
  53           based on the 68020 processor. For the most part it is used in
  54           System-On-Chip parts, and does not contain a paging MMU.
  55
  56 config M68020
  57         bool "68020 support"
  58         depends on MMU
  59         select GENERIC_ATOMIC64
  60         select CPU_HAS_ADDRESS_SPACES
  61         help
  62           If you anticipate running this kernel on a computer with a MC68020
  63           processor, say Y. Otherwise, say N. Note that the 68020 requires a
  64           68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
  65           Sun 3, which provides its own version.
  66
  67 config M68030
  68         bool "68030 support"
  69         depends on MMU && !MMU_SUN3
  70         select GENERIC_ATOMIC64
  71         select CPU_HAS_ADDRESS_SPACES
  72         help
  73           If you anticipate running this kernel on a computer with a MC68030
  74           processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
  75           work, as it does not include an MMU (Memory Management Unit).
  76
  77 config M68040
  78         bool "68040 support"
  79         depends on MMU && !MMU_SUN3
  80         select GENERIC_ATOMIC64
  81         select CPU_HAS_ADDRESS_SPACES
  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
  91         select GENERIC_ATOMIC64
  92         select CPU_HAS_ADDRESS_SPACES
  93         help
  94           If you anticipate running this kernel on a computer with a MC68060
  95           processor, say Y. Otherwise, say N.
  96
  97 config M68328
  98         bool "MC68328"
  99         depends on !MMU
 100         select M68000
 101         help
 102           Motorola 68328 processor support.
 103
 104 config M68EZ328
 105         bool "MC68EZ328"
 106         depends on !MMU
 107         select M68000
 108         help
 109           Motorola 68EX328 processor support.
 110
 111 config M68VZ328
 112         bool "MC68VZ328"
 113         depends on !MMU
 114         select M68000
 115         help
 116           Motorola 68VZ328 processor support.
 117
 118 config M68360
 119         bool "MC68360"
 120         depends on !MMU
 121         select MCPU32
 122         help
 123           Motorola 68360 processor support.
 124
 125 endif # M68KCLASSIC
 126
 127 if COLDFIRE
 128
 129 config M5206
 130         bool "MCF5206"
 131         depends on !MMU
 132         select COLDFIRE_SW_A7
 133         select HAVE_MBAR
 134         help
 135           Motorola ColdFire 5206 processor support.
 136
 137 config M5206e
 138         bool "MCF5206e"
 139         depends on !MMU
 140         select COLDFIRE_SW_A7
 141         select HAVE_MBAR
 142         help
 143           Motorola ColdFire 5206e processor support.
 144
 145 config M520x
 146         bool "MCF520x"
 147         depends on !MMU
 148         select GENERIC_CLOCKEVENTS
 149         select HAVE_CACHE_SPLIT
 150         help
 151            Freescale Coldfire 5207/5208 processor support.
 152
 153 config M523x
 154         bool "MCF523x"
 155         depends on !MMU
 156         select GENERIC_CLOCKEVENTS
 157         select HAVE_CACHE_SPLIT
 158         select HAVE_IPSBAR
 159         help
 160           Freescale Coldfire 5230/1/2/4/5 processor support
 161
 162 config M5249
 163         bool "MCF5249"
 164         depends on !MMU
 165         select COLDFIRE_SW_A7
 166         select HAVE_MBAR
 167         help
 168           Motorola ColdFire 5249 processor support.
 169
 170 config M527x
 171         bool
 172
 173 config M5271
 174         bool "MCF5271"
 175         depends on !MMU
 176         select M527x
 177         select HAVE_CACHE_SPLIT
 178         select HAVE_IPSBAR
 179         select GENERIC_CLOCKEVENTS
 180         help
 181           Freescale (Motorola) ColdFire 5270/5271 processor support.
 182
 183 config M5272
 184         bool "MCF5272"
 185         depends on !MMU
 186         select COLDFIRE_SW_A7
 187         select HAVE_MBAR
 188         help
 189           Motorola ColdFire 5272 processor support.
 190
 191 config M5275
 192         bool "MCF5275"
 193         depends on !MMU
 194         select M527x
 195         select HAVE_CACHE_SPLIT
 196         select HAVE_IPSBAR
 197         select GENERIC_CLOCKEVENTS
 198         help
 199           Freescale (Motorola) ColdFire 5274/5275 processor support.
 200
 201 config M528x
 202         bool "MCF528x"
 203         depends on !MMU
 204         select GENERIC_CLOCKEVENTS
 205         select HAVE_CACHE_SPLIT
 206         select HAVE_IPSBAR
 207         help
 208           Motorola ColdFire 5280/5282 processor support.
 209
 210 config M5307
 211         bool "MCF5307"
 212         depends on !MMU
 213         select COLDFIRE_SW_A7
 214         select HAVE_CACHE_CB
 215         select HAVE_MBAR
 216         help
 217           Motorola ColdFire 5307 processor support.
 218
 219 config M532x
 220         bool "MCF532x"
 221         depends on !MMU
 222         select HAVE_CACHE_CB
 223         help
 224           Freescale (Motorola) ColdFire 532x processor support.
 225
 226 config M5407
 227         bool "MCF5407"
 228         depends on !MMU
 229         select COLDFIRE_SW_A7
 230         select HAVE_CACHE_CB
 231         select HAVE_MBAR
 232         help
 233           Motorola ColdFire 5407 processor support.
 234
 235 config M54xx
 236         bool
 237
 238 config M547x
 239         bool "MCF547x"
 240         select M54xx
 241         select MMU_COLDFIRE if MMU
 242         select HAVE_CACHE_CB
 243         select HAVE_MBAR
 244         help
 245           Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
 246
 247 config M548x
 248         bool "MCF548x"
 249         select MMU_COLDFIRE if MMU
 250         select M54xx
 251         select HAVE_CACHE_CB
 252         select HAVE_MBAR
 253         help
 254           Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
 255
 256 endif # COLDFIRE
 257
 258
 259 comment "Processor Specific Options"
 260
 261 config M68KFPU_EMU
 262         bool "Math emulation support (EXPERIMENTAL)"
 263         depends on MMU
 264         depends on EXPERIMENTAL
 265         help
 266           At some point in the future, this will cause floating-point math
 267           instructions to be emulated by the kernel on machines that lack a
 268           floating-point math coprocessor.  Thrill-seekers and chronically
 269           sleep-deprived psychotic hacker types can say Y now, everyone else
 270           should probably wait a while.
 271
 272 config M68KFPU_EMU_EXTRAPREC
 273         bool "Math emulation extra precision"
 274         depends on M68KFPU_EMU
 275         help
 276           The fpu uses normally a few bit more during calculations for
 277           correct rounding, the emulator can (often) do the same but this
 278           extra calculation can cost quite some time, so you can disable
 279           it here. The emulator will then "only" calculate with a 64 bit
 280           mantissa and round slightly incorrect, what is more than enough
 281           for normal usage.
 282
 283 config M68KFPU_EMU_ONLY
 284         bool "Math emulation only kernel"
 285         depends on M68KFPU_EMU
 286         help
 287           This option prevents any floating-point instructions from being
 288           compiled into the kernel, thereby the kernel doesn't save any
 289           floating point context anymore during task switches, so this
 290           kernel will only be usable on machines without a floating-point
 291           math coprocessor. This makes the kernel a bit faster as no tests
 292           needs to be executed whether a floating-point instruction in the
 293           kernel should be executed or not.
 294
 295 config ADVANCED
 296         bool "Advanced configuration options"
 297         depends on MMU
 298         ---help---
 299           This gives you access to some advanced options for the CPU. The
 300           defaults should be fine for most users, but these options may make
 301           it possible for you to improve performance somewhat if you know what
 302           you are doing.
 303
 304           Note that the answer to this question won't directly affect the
 305           kernel: saying N will just cause the configurator to skip all
 306           the questions about these options.
 307
 308           Most users should say N to this question.
 309
 310 config RMW_INSNS
 311         bool "Use read-modify-write instructions"
 312         depends on ADVANCED
 313         ---help---
 314           This allows to use certain instructions that work with indivisible
 315           read-modify-write bus cycles. While this is faster than the
 316           workaround of disabling interrupts, it can conflict with DMA
 317           ( = direct memory access) on many Amiga systems, and it is also said
 318           to destabilize other machines. It is very likely that this will
 319           cause serious problems on any Amiga or Atari Medusa if set. The only
 320           configuration where it should work are 68030-based Ataris, where it
 321           apparently improves performance. But you've been warned! Unless you
 322           really know what you are doing, say N. Try Y only if you're quite
 323           adventurous.
 324
 325 config SINGLE_MEMORY_CHUNK
 326         bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
 327         depends on MMU
 328         default y if SUN3
 329         select NEED_MULTIPLE_NODES
 330         help
 331           Ignore all but the first contiguous chunk of physical memory for VM
 332           purposes.  This will save a few bytes kernel size and may speed up
 333           some operations.  Say N if not sure.
 334
 335 config ARCH_DISCONTIGMEM_ENABLE
 336         def_bool MMU && !SINGLE_MEMORY_CHUNK
 337
 338 config 060_WRITETHROUGH
 339         bool "Use write-through caching for 68060 supervisor accesses"
 340         depends on ADVANCED && M68060
 341         ---help---
 342           The 68060 generally uses copyback caching of recently accessed data.
 343           Copyback caching means that memory writes will be held in an on-chip
 344           cache and only written back to memory some time later.  Saying Y
 345           here will force supervisor (kernel) accesses to use writethrough
 346           caching.  Writethrough caching means that data is written to memory
 347           straight away, so that cache and memory data always agree.
 348           Writethrough caching is less efficient, but is needed for some
 349           drivers on 68060 based systems where the 68060 bus snooping signal
 350           is hardwired on.  The 53c710 SCSI driver is known to suffer from
 351           this problem.
 352
 353 config M68K_L2_CACHE
 354         bool
 355         depends on MAC
 356         default y
 357
 358 config NODES_SHIFT
 359         int
 360         default "3"
 361         depends on !SINGLE_MEMORY_CHUNK
 362
 363 config FPU
 364         bool
 365
 366 config COLDFIRE_SW_A7
 367         bool
 368
 369 config HAVE_CACHE_SPLIT
 370         bool
 371
 372 config HAVE_CACHE_CB
 373         bool
 374
 375 config HAVE_MBAR
 376         bool
 377
 378 config HAVE_IPSBAR
 379         bool
 380
 381 config CLOCK_SET
 382         bool "Enable setting the CPU clock frequency"
 383         depends on COLDFIRE
 384         default n
 385         help
 386           On some CPU's you do not need to know what the core CPU clock
 387           frequency is. On these you can disable clock setting. On some
 388           traditional 68K parts, and on all ColdFire parts you need to set
 389           the appropriate CPU clock frequency. On these devices many of the
 390           onboard peripherals derive their timing from the master CPU clock
 391           frequency.
 392
 393 config CLOCK_FREQ
 394         int "Set the core clock frequency"
 395         default "66666666"
 396         depends on CLOCK_SET
 397         help
 398           Define the CPU clock frequency in use. This is the core clock
 399           frequency, it may or may not be the same as the external clock
 400           crystal fitted to your board. Some processors have an internal
 401           PLL and can have their frequency programmed at run time, others
 402           use internal dividers. In general the kernel won't setup a PLL
 403           if it is fitted (there are some exceptions). This value will be
 404           specific to the exact CPU that you are using.
 405
 406 config OLDMASK
 407         bool "Old mask 5307 (1H55J) silicon"
 408         depends on M5307
 409         help
 410           Build support for the older revision ColdFire 5307 silicon.
 411           Specifically this is the 1H55J mask revision.
 412
 413 if HAVE_CACHE_SPLIT
 414 choice
 415         prompt "Split Cache Configuration"
 416         default CACHE_I
 417
 418 config CACHE_I
 419         bool "Instruction"
 420         help
 421           Use all of the ColdFire CPU cache memory as an instruction cache.
 422
 423 config CACHE_D
 424         bool "Data"
 425         help
 426           Use all of the ColdFire CPU cache memory as a data cache.
 427
 428 config CACHE_BOTH
 429         bool "Both"
 430         help
 431           Split the ColdFire CPU cache, and use half as an instruction cache
 432           and half as a data cache.
 433 endchoice
 434 endif
 435
 436 if HAVE_CACHE_CB
 437 choice
 438         prompt "Data cache mode"
 439         default CACHE_WRITETHRU
 440
 441 config CACHE_WRITETHRU
 442         bool "Write-through"
 443         help
 444           The ColdFire CPU cache is set into Write-through mode.
 445
 446 config CACHE_COPYBACK
 447         bool "Copy-back"
 448         help
 449           The ColdFire CPU cache is set into Copy-back mode.
 450 endchoice
 451 endif
 452