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 ARCH_HAVE_CUSTOM_GPIO_H
  26         select CPU_HAS_NO_BITFIELDS
  27         select CPU_HAS_NO_MULDIV64
  28         select GENERIC_CSUM
  29         select GPIOLIB
  30         select HAVE_CLK
  31
  32 endchoice
  33
  34 if M68KCLASSIC
  35
  36 config M68000
  37         bool "MC68000"
  38         depends on !MMU
  39         select CPU_HAS_NO_BITFIELDS
  40         select CPU_HAS_NO_MULDIV64
  41         select CPU_HAS_NO_UNALIGNED
  42         select GENERIC_CSUM
  43         select CPU_NO_EFFICIENT_FFS
  44         select HAVE_ARCH_HASH
  45         help
  46           The Freescale (was Motorola) 68000 CPU is the first generation of
  47           the well known M68K family of processors. The CPU core as well as
  48           being available as a stand alone CPU was also used in many
  49           System-On-Chip devices (eg 68328, 68302, etc). It does not contain
  50           a paging MMU.
  51
  52 config MCPU32
  53         bool
  54         select CPU_HAS_NO_BITFIELDS
  55         select CPU_HAS_NO_UNALIGNED
  56         select CPU_NO_EFFICIENT_FFS
  57         help
  58           The Freescale (was then Motorola) CPU32 is a CPU core that is
  59           based on the 68020 processor. For the most part it is used in
  60           System-On-Chip parts, and does not contain a paging MMU.
  61
  62 config M68020
  63         bool "68020 support"
  64         depends on MMU
  65         select CPU_HAS_ADDRESS_SPACES
  66         help
  67           If you anticipate running this kernel on a computer with a MC68020
  68           processor, say Y. Otherwise, say N. Note that the 68020 requires a
  69           68851 MMU (Memory Management Unit) to run Linux/m68k, except on the
  70           Sun 3, which provides its own version.
  71
  72 config M68030
  73         bool "68030 support"
  74         depends on MMU && !MMU_SUN3
  75         select CPU_HAS_ADDRESS_SPACES
  76         help
  77           If you anticipate running this kernel on a computer with a MC68030
  78           processor, say Y. Otherwise, say N. Note that a MC68EC030 will not
  79           work, as it does not include an MMU (Memory Management Unit).
  80
  81 config M68040
  82         bool "68040 support"
  83         depends on MMU && !MMU_SUN3
  84         select CPU_HAS_ADDRESS_SPACES
  85         help
  86           If you anticipate running this kernel on a computer with a MC68LC040
  87           or MC68040 processor, say Y. Otherwise, say N. Note that an
  88           MC68EC040 will not work, as it does not include an MMU (Memory
  89           Management Unit).
  90
  91 config M68060
  92         bool "68060 support"
  93         depends on MMU && !MMU_SUN3
  94         select CPU_HAS_ADDRESS_SPACES
  95         help
  96           If you anticipate running this kernel on a computer with a MC68060
  97           processor, say Y. Otherwise, say N.
  98
  99 config M68328
 100         bool "MC68328"
 101         depends on !MMU
 102         select M68000
 103         help
 104           Motorola 68328 processor support.
 105
 106 config M68EZ328
 107         bool "MC68EZ328"
 108         depends on !MMU
 109         select M68000
 110         help
 111           Motorola 68EX328 processor support.
 112
 113 config M68VZ328
 114         bool "MC68VZ328"
 115         depends on !MMU
 116         select M68000
 117         help
 118           Motorola 68VZ328 processor support.
 119
 120 endif # M68KCLASSIC
 121
 122 if COLDFIRE
 123
 124 choice
 125         prompt "ColdFire SoC type"
 126         default M520x
 127         help
 128           Select the type of ColdFire System-on-Chip (SoC) that you want
 129           to build for.
 130
 131 config M5206
 132         bool "MCF5206"
 133         depends on !MMU
 134         select COLDFIRE_SW_A7
 135         select HAVE_MBAR
 136         select CPU_NO_EFFICIENT_FFS
 137         help
 138           Motorola ColdFire 5206 processor support.
 139
 140 config M5206e
 141         bool "MCF5206e"
 142         depends on !MMU
 143         select COLDFIRE_SW_A7
 144         select HAVE_MBAR
 145         select CPU_NO_EFFICIENT_FFS
 146         help
 147           Motorola ColdFire 5206e processor support.
 148
 149 config M520x
 150         bool "MCF520x"
 151         depends on !MMU
 152         select GENERIC_CLOCKEVENTS
 153         select HAVE_CACHE_SPLIT
 154         help
 155            Freescale Coldfire 5207/5208 processor support.
 156
 157 config M523x
 158         bool "MCF523x"
 159         depends on !MMU
 160         select GENERIC_CLOCKEVENTS
 161         select HAVE_CACHE_SPLIT
 162         select HAVE_IPSBAR
 163         help
 164           Freescale Coldfire 5230/1/2/4/5 processor support
 165
 166 config M5249
 167         bool "MCF5249"
 168         depends on !MMU
 169         select COLDFIRE_SW_A7
 170         select HAVE_MBAR
 171         select CPU_NO_EFFICIENT_FFS
 172         help
 173           Motorola ColdFire 5249 processor support.
 174
 175 config M525x
 176         bool "MCF525x"
 177         depends on !MMU
 178         select COLDFIRE_SW_A7
 179         select HAVE_MBAR
 180         select CPU_NO_EFFICIENT_FFS
 181         help
 182           Freescale (Motorola) Coldfire 5251/5253 processor support.
 183
 184 config M5271
 185         bool "MCF5271"
 186         depends on !MMU
 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
 197         select COLDFIRE_SW_A7
 198         select HAVE_MBAR
 199         select CPU_NO_EFFICIENT_FFS
 200         help
 201           Motorola ColdFire 5272 processor support.
 202
 203 config M5275
 204         bool "MCF5275"
 205         depends on !MMU
 206         select M527x
 207         select HAVE_CACHE_SPLIT
 208         select HAVE_IPSBAR
 209         select GENERIC_CLOCKEVENTS
 210         help
 211           Freescale (Motorola) ColdFire 5274/5275 processor support.
 212
 213 config M528x
 214         bool "MCF528x"
 215         depends on !MMU
 216         select GENERIC_CLOCKEVENTS
 217         select HAVE_CACHE_SPLIT
 218         select HAVE_IPSBAR
 219         help
 220           Motorola ColdFire 5280/5282 processor support.
 221
 222 config M5307
 223         bool "MCF5307"
 224         depends on !MMU
 225         select COLDFIRE_SW_A7
 226         select HAVE_CACHE_CB
 227         select HAVE_MBAR
 228         select CPU_NO_EFFICIENT_FFS
 229         help
 230           Motorola ColdFire 5307 processor support.
 231
 232 config M532x
 233         bool "MCF532x"
 234         depends on !MMU
 235         select M53xx
 236         select HAVE_CACHE_CB
 237         help
 238           Freescale (Motorola) ColdFire 532x processor support.
 239
 240 config M537x
 241         bool "MCF537x"
 242         depends on !MMU
 243         select M53xx
 244         select HAVE_CACHE_CB
 245         help
 246           Freescale ColdFire 537x processor support.
 247
 248 config M5407
 249         bool "MCF5407"
 250         depends on !MMU
 251         select COLDFIRE_SW_A7
 252         select HAVE_CACHE_CB
 253         select HAVE_MBAR
 254         select CPU_NO_EFFICIENT_FFS
 255         help
 256           Motorola ColdFire 5407 processor support.
 257
 258 config M547x
 259         bool "MCF547x"
 260         select M54xx
 261         select MMU_COLDFIRE if MMU
 262         select HAVE_CACHE_CB
 263         select HAVE_MBAR
 264         select CPU_NO_EFFICIENT_FFS
 265         help
 266           Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
 267
 268 config M548x
 269         bool "MCF548x"
 270         select MMU_COLDFIRE if MMU
 271         select M54xx
 272         select HAVE_CACHE_CB
 273         select HAVE_MBAR
 274         select CPU_NO_EFFICIENT_FFS
 275         help
 276           Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
 277
 278 config M5441x
 279         bool "MCF5441x"
 280         depends on !MMU
 281         select GENERIC_CLOCKEVENTS
 282         select HAVE_CACHE_CB
 283         help
 284           Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
 285
 286 endchoice
 287
 288 config M527x
 289         bool
 290
 291 config M53xx
 292         bool
 293
 294 config M54xx
 295         bool
 296
 297 endif # COLDFIRE
 298
 299
 300 comment "Processor Specific Options"
 301
 302 config M68KFPU_EMU
 303         bool "Math emulation support"
 304         depends on MMU
 305         help
 306           At some point in the future, this will cause floating-point math
 307           instructions to be emulated by the kernel on machines that lack a
 308           floating-point math coprocessor.  Thrill-seekers and chronically
 309           sleep-deprived psychotic hacker types can say Y now, everyone else
 310           should probably wait a while.
 311
 312 config M68KFPU_EMU_EXTRAPREC
 313         bool "Math emulation extra precision"
 314         depends on M68KFPU_EMU
 315         help
 316           The fpu uses normally a few bit more during calculations for
 317           correct rounding, the emulator can (often) do the same but this
 318           extra calculation can cost quite some time, so you can disable
 319           it here. The emulator will then "only" calculate with a 64 bit
 320           mantissa and round slightly incorrect, what is more than enough
 321           for normal usage.
 322
 323 config M68KFPU_EMU_ONLY
 324         bool "Math emulation only kernel"
 325         depends on M68KFPU_EMU
 326         help
 327           This option prevents any floating-point instructions from being
 328           compiled into the kernel, thereby the kernel doesn't save any
 329           floating point context anymore during task switches, so this
 330           kernel will only be usable on machines without a floating-point
 331           math coprocessor. This makes the kernel a bit faster as no tests
 332           needs to be executed whether a floating-point instruction in the
 333           kernel should be executed or not.
 334
 335 config ADVANCED
 336         bool "Advanced configuration options"
 337         depends on MMU
 338         ---help---
 339           This gives you access to some advanced options for the CPU. The
 340           defaults should be fine for most users, but these options may make
 341           it possible for you to improve performance somewhat if you know what
 342           you are doing.
 343
 344           Note that the answer to this question won't directly affect the
 345           kernel: saying N will just cause the configurator to skip all
 346           the questions about these options.
 347
 348           Most users should say N to this question.
 349
 350 config RMW_INSNS
 351         bool "Use read-modify-write instructions"
 352         depends on ADVANCED
 353         ---help---
 354           This allows to use certain instructions that work with indivisible
 355           read-modify-write bus cycles. While this is faster than the
 356           workaround of disabling interrupts, it can conflict with DMA
 357           ( = direct memory access) on many Amiga systems, and it is also said
 358           to destabilize other machines. It is very likely that this will
 359           cause serious problems on any Amiga or Atari Medusa if set. The only
 360           configuration where it should work are 68030-based Ataris, where it
 361           apparently improves performance. But you've been warned! Unless you
 362           really know what you are doing, say N. Try Y only if you're quite
 363           adventurous.
 364
 365 config SINGLE_MEMORY_CHUNK
 366         bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
 367         depends on MMU
 368         default y if SUN3
 369         select NEED_MULTIPLE_NODES
 370         help
 371           Ignore all but the first contiguous chunk of physical memory for VM
 372           purposes.  This will save a few bytes kernel size and may speed up
 373           some operations.  Say N if not sure.
 374
 375 config ARCH_DISCONTIGMEM_ENABLE
 376         def_bool MMU && !SINGLE_MEMORY_CHUNK
 377
 378 config 060_WRITETHROUGH
 379         bool "Use write-through caching for 68060 supervisor accesses"
 380         depends on ADVANCED && M68060
 381         ---help---
 382           The 68060 generally uses copyback caching of recently accessed data.
 383           Copyback caching means that memory writes will be held in an on-chip
 384           cache and only written back to memory some time later.  Saying Y
 385           here will force supervisor (kernel) accesses to use writethrough
 386           caching.  Writethrough caching means that data is written to memory
 387           straight away, so that cache and memory data always agree.
 388           Writethrough caching is less efficient, but is needed for some
 389           drivers on 68060 based systems where the 68060 bus snooping signal
 390           is hardwired on.  The 53c710 SCSI driver is known to suffer from
 391           this problem.
 392
 393 config M68K_L2_CACHE
 394         bool
 395         depends on MAC
 396         default y
 397
 398 config NODES_SHIFT
 399         int
 400         default "3"
 401         depends on !SINGLE_MEMORY_CHUNK
 402
 403 config CPU_HAS_NO_BITFIELDS
 404         bool
 405
 406 config CPU_HAS_NO_MULDIV64
 407         bool
 408
 409 config CPU_HAS_NO_UNALIGNED
 410         bool
 411
 412 config CPU_HAS_ADDRESS_SPACES
 413         bool
 414
 415 config FPU
 416         bool
 417
 418 config COLDFIRE_SW_A7
 419         bool
 420
 421 config HAVE_CACHE_SPLIT
 422         bool
 423
 424 config HAVE_CACHE_CB
 425         bool
 426
 427 config HAVE_MBAR
 428         bool
 429
 430 config HAVE_IPSBAR
 431         bool
 432
 433 config CLOCK_FREQ
 434         int "Set the core clock frequency"
 435         default "25000000" if M5206
 436         default "54000000" if M5206e
 437         default "166666666" if M520x
 438         default "140000000" if M5249
 439         default "150000000" if M527x || M523x
 440         default "90000000" if M5307
 441         default "50000000" if M5407
 442         default "266000000" if M54xx
 443         default "66666666"
 444         depends on COLDFIRE
 445         help
 446           Define the CPU clock frequency in use. This is the core clock
 447           frequency, it may or may not be the same as the external clock
 448           crystal fitted to your board. Some processors have an internal
 449           PLL and can have their frequency programmed at run time, others
 450           use internal dividers. In general the kernel won't setup a PLL
 451           if it is fitted (there are some exceptions). This value will be
 452           specific to the exact CPU that you are using.
 453
 454 config OLDMASK
 455         bool "Old mask 5307 (1H55J) silicon"
 456         depends on M5307
 457         help
 458           Build support for the older revision ColdFire 5307 silicon.
 459           Specifically this is the 1H55J mask revision.
 460
 461 if HAVE_CACHE_SPLIT
 462 choice
 463         prompt "Split Cache Configuration"
 464         default CACHE_I
 465
 466 config CACHE_I
 467         bool "Instruction"
 468         help
 469           Use all of the ColdFire CPU cache memory as an instruction cache.
 470
 471 config CACHE_D
 472         bool "Data"
 473         help
 474           Use all of the ColdFire CPU cache memory as a data cache.
 475
 476 config CACHE_BOTH
 477         bool "Both"
 478         help
 479           Split the ColdFire CPU cache, and use half as an instruction cache
 480           and half as a data cache.
 481 endchoice
 482 endif
 483
 484 if HAVE_CACHE_CB
 485 choice
 486         prompt "Data cache mode"
 487         default CACHE_WRITETHRU
 488
 489 config CACHE_WRITETHRU
 490         bool "Write-through"
 491         help
 492           The ColdFire CPU cache is set into Write-through mode.
 493
 494 config CACHE_COPYBACK
 495         bool "Copy-back"
 496         help
 497           The ColdFire CPU cache is set into Copy-back mode.
 498 endchoice
 499 endif
 500