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_WANT_OPTIONAL_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         select HAVE_CLK
  32
  33 endchoice
  34
  35 if M68KCLASSIC
  36
  37 config M68000
  38         bool "MC68000"
  39         depends on !MMU
  40         select CPU_HAS_NO_BITFIELDS
  41         select CPU_HAS_NO_MULDIV64
  42         select CPU_HAS_NO_UNALIGNED
  43         select GENERIC_CSUM
  44         help
  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
  49           a paging MMU.
  50
  51 config MCPU32
  52         bool
  53         select CPU_HAS_NO_BITFIELDS
  54         select CPU_HAS_NO_UNALIGNED
  55         help
  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.
  59
  60 config M68020
  61         bool "68020 support"
  62         depends on MMU
  63         select CPU_HAS_ADDRESS_SPACES
  64         help
  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.
  69
  70 config M68030
  71         bool "68030 support"
  72         depends on MMU && !MMU_SUN3
  73         select CPU_HAS_ADDRESS_SPACES
  74         help
  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).
  78
  79 config M68040
  80         bool "68040 support"
  81         depends on MMU && !MMU_SUN3
  82         select CPU_HAS_ADDRESS_SPACES
  83         help
  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
  87           Management Unit).
  88
  89 config M68060
  90         bool "68060 support"
  91         depends on MMU && !MMU_SUN3
  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 M525x
 171         bool "MCF525x"
 172         depends on !MMU
 173         select COLDFIRE_SW_A7
 174         select HAVE_MBAR
 175         help
 176           Freescale (Motorola) Coldfire 5251/5253 processor support.
 177
 178 config M527x
 179         bool
 180
 181 config M5271
 182         bool "MCF5271"
 183         depends on !MMU
 184         select M527x
 185         select HAVE_CACHE_SPLIT
 186         select HAVE_IPSBAR
 187         select GENERIC_CLOCKEVENTS
 188         help
 189           Freescale (Motorola) ColdFire 5270/5271 processor support.
 190
 191 config M5272
 192         bool "MCF5272"
 193         depends on !MMU
 194         select COLDFIRE_SW_A7
 195         select HAVE_MBAR
 196         help
 197           Motorola ColdFire 5272 processor support.
 198
 199 config M5275
 200         bool "MCF5275"
 201         depends on !MMU
 202         select M527x
 203         select HAVE_CACHE_SPLIT
 204         select HAVE_IPSBAR
 205         select GENERIC_CLOCKEVENTS
 206         help
 207           Freescale (Motorola) ColdFire 5274/5275 processor support.
 208
 209 config M528x
 210         bool "MCF528x"
 211         depends on !MMU
 212         select GENERIC_CLOCKEVENTS
 213         select HAVE_CACHE_SPLIT
 214         select HAVE_IPSBAR
 215         help
 216           Motorola ColdFire 5280/5282 processor support.
 217
 218 config M5307
 219         bool "MCF5307"
 220         depends on !MMU
 221         select COLDFIRE_SW_A7
 222         select HAVE_CACHE_CB
 223         select HAVE_MBAR
 224         help
 225           Motorola ColdFire 5307 processor support.
 226
 227 config M53xx
 228         bool
 229
 230 config M532x
 231         bool "MCF532x"
 232         depends on !MMU
 233         select M53xx
 234         select HAVE_CACHE_CB
 235         help
 236           Freescale (Motorola) ColdFire 532x processor support.
 237
 238 config M5407
 239         bool "MCF5407"
 240         depends on !MMU
 241         select COLDFIRE_SW_A7
 242         select HAVE_CACHE_CB
 243         select HAVE_MBAR
 244         help
 245           Motorola ColdFire 5407 processor support.
 246
 247 config M54xx
 248         bool
 249
 250 config M547x
 251         bool "MCF547x"
 252         select M54xx
 253         select MMU_COLDFIRE if MMU
 254         select HAVE_CACHE_CB
 255         select HAVE_MBAR
 256         help
 257           Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
 258
 259 config M548x
 260         bool "MCF548x"
 261         select MMU_COLDFIRE if MMU
 262         select M54xx
 263         select HAVE_CACHE_CB
 264         select HAVE_MBAR
 265         help
 266           Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
 267
 268 config M5441x
 269         bool "MCF5441x"
 270         depends on !MMU
 271         select GENERIC_CLOCKEVENTS
 272         select HAVE_CACHE_CB
 273         help
 274           Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
 275
 276 endif # COLDFIRE
 277
 278
 279 comment "Processor Specific Options"
 280
 281 config M68KFPU_EMU
 282         bool "Math emulation support"
 283         depends on MMU
 284         help
 285           At some point in the future, this will cause floating-point math
 286           instructions to be emulated by the kernel on machines that lack a
 287           floating-point math coprocessor.  Thrill-seekers and chronically
 288           sleep-deprived psychotic hacker types can say Y now, everyone else
 289           should probably wait a while.
 290
 291 config M68KFPU_EMU_EXTRAPREC
 292         bool "Math emulation extra precision"
 293         depends on M68KFPU_EMU
 294         help
 295           The fpu uses normally a few bit more during calculations for
 296           correct rounding, the emulator can (often) do the same but this
 297           extra calculation can cost quite some time, so you can disable
 298           it here. The emulator will then "only" calculate with a 64 bit
 299           mantissa and round slightly incorrect, what is more than enough
 300           for normal usage.
 301
 302 config M68KFPU_EMU_ONLY
 303         bool "Math emulation only kernel"
 304         depends on M68KFPU_EMU
 305         help
 306           This option prevents any floating-point instructions from being
 307           compiled into the kernel, thereby the kernel doesn't save any
 308           floating point context anymore during task switches, so this
 309           kernel will only be usable on machines without a floating-point
 310           math coprocessor. This makes the kernel a bit faster as no tests
 311           needs to be executed whether a floating-point instruction in the
 312           kernel should be executed or not.
 313
 314 config ADVANCED
 315         bool "Advanced configuration options"
 316         depends on MMU
 317         ---help---
 318           This gives you access to some advanced options for the CPU. The
 319           defaults should be fine for most users, but these options may make
 320           it possible for you to improve performance somewhat if you know what
 321           you are doing.
 322
 323           Note that the answer to this question won't directly affect the
 324           kernel: saying N will just cause the configurator to skip all
 325           the questions about these options.
 326
 327           Most users should say N to this question.
 328
 329 config RMW_INSNS
 330         bool "Use read-modify-write instructions"
 331         depends on ADVANCED
 332         ---help---
 333           This allows to use certain instructions that work with indivisible
 334           read-modify-write bus cycles. While this is faster than the
 335           workaround of disabling interrupts, it can conflict with DMA
 336           ( = direct memory access) on many Amiga systems, and it is also said
 337           to destabilize other machines. It is very likely that this will
 338           cause serious problems on any Amiga or Atari Medusa if set. The only
 339           configuration where it should work are 68030-based Ataris, where it
 340           apparently improves performance. But you've been warned! Unless you
 341           really know what you are doing, say N. Try Y only if you're quite
 342           adventurous.
 343
 344 config SINGLE_MEMORY_CHUNK
 345         bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
 346         depends on MMU
 347         default y if SUN3
 348         select NEED_MULTIPLE_NODES
 349         help
 350           Ignore all but the first contiguous chunk of physical memory for VM
 351           purposes.  This will save a few bytes kernel size and may speed up
 352           some operations.  Say N if not sure.
 353
 354 config ARCH_DISCONTIGMEM_ENABLE
 355         def_bool MMU && !SINGLE_MEMORY_CHUNK
 356
 357 config 060_WRITETHROUGH
 358         bool "Use write-through caching for 68060 supervisor accesses"
 359         depends on ADVANCED && M68060
 360         ---help---
 361           The 68060 generally uses copyback caching of recently accessed data.
 362           Copyback caching means that memory writes will be held in an on-chip
 363           cache and only written back to memory some time later.  Saying Y
 364           here will force supervisor (kernel) accesses to use writethrough
 365           caching.  Writethrough caching means that data is written to memory
 366           straight away, so that cache and memory data always agree.
 367           Writethrough caching is less efficient, but is needed for some
 368           drivers on 68060 based systems where the 68060 bus snooping signal
 369           is hardwired on.  The 53c710 SCSI driver is known to suffer from
 370           this problem.
 371
 372 config M68K_L2_CACHE
 373         bool
 374         depends on MAC
 375         default y
 376
 377 config NODES_SHIFT
 378         int
 379         default "3"
 380         depends on !SINGLE_MEMORY_CHUNK
 381
 382 config CPU_HAS_NO_BITFIELDS
 383         bool
 384
 385 config CPU_HAS_NO_MULDIV64
 386         bool
 387
 388 config CPU_HAS_NO_UNALIGNED
 389         bool
 390
 391 config CPU_HAS_ADDRESS_SPACES
 392         bool
 393
 394 config FPU
 395         bool
 396
 397 config COLDFIRE_SW_A7
 398         bool
 399
 400 config HAVE_CACHE_SPLIT
 401         bool
 402
 403 config HAVE_CACHE_CB
 404         bool
 405
 406 config HAVE_MBAR
 407         bool
 408
 409 config HAVE_IPSBAR
 410         bool
 411
 412 config CLOCK_SET
 413         bool "Enable setting the CPU clock frequency"
 414         depends on COLDFIRE
 415         default n
 416         help
 417           On some CPU's you do not need to know what the core CPU clock
 418           frequency is. On these you can disable clock setting. On some
 419           traditional 68K parts, and on all ColdFire parts you need to set
 420           the appropriate CPU clock frequency. On these devices many of the
 421           onboard peripherals derive their timing from the master CPU clock
 422           frequency.
 423
 424 config CLOCK_FREQ
 425         int "Set the core clock frequency"
 426         default "66666666"
 427         depends on CLOCK_SET
 428         help
 429           Define the CPU clock frequency in use. This is the core clock
 430           frequency, it may or may not be the same as the external clock
 431           crystal fitted to your board. Some processors have an internal
 432           PLL and can have their frequency programmed at run time, others
 433           use internal dividers. In general the kernel won't setup a PLL
 434           if it is fitted (there are some exceptions). This value will be
 435           specific to the exact CPU that you are using.
 436
 437 config OLDMASK
 438         bool "Old mask 5307 (1H55J) silicon"
 439         depends on M5307
 440         help
 441           Build support for the older revision ColdFire 5307 silicon.
 442           Specifically this is the 1H55J mask revision.
 443
 444 if HAVE_CACHE_SPLIT
 445 choice
 446         prompt "Split Cache Configuration"
 447         default CACHE_I
 448
 449 config CACHE_I
 450         bool "Instruction"
 451         help
 452           Use all of the ColdFire CPU cache memory as an instruction cache.
 453
 454 config CACHE_D
 455         bool "Data"
 456         help
 457           Use all of the ColdFire CPU cache memory as a data cache.
 458
 459 config CACHE_BOTH
 460         bool "Both"
 461         help
 462           Split the ColdFire CPU cache, and use half as an instruction cache
 463           and half as a data cache.
 464 endchoice
 465 endif
 466
 467 if HAVE_CACHE_CB
 468 choice
 469         prompt "Data cache mode"
 470         default CACHE_WRITETHRU
 471
 472 config CACHE_WRITETHRU
 473         bool "Write-through"
 474         help
 475           The ColdFire CPU cache is set into Write-through mode.
 476
 477 config CACHE_COPYBACK
 478         bool "Copy-back"
 479         help
 480           The ColdFire CPU cache is set into Copy-back mode.
 481 endchoice
 482 endif
 483