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_REQUIRE_GPIOLIB
  26         select ARCH_HAVE_CUSTOM_GPIO_H
  27         select CPU_HAS_NO_BITFIELDS
  28         select CPU_HAS_NO_MULDIV64
  29         select GENERIC_CSUM
  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         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
  53         select CPU_HAS_NO_UNALIGNED
  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
  59 config M68020
  60         bool "68020 support"
  61         depends on MMU
  62         select CPU_HAS_ADDRESS_SPACES
  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
  72         select CPU_HAS_ADDRESS_SPACES
  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
  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 CPU_HAS_ADDRESS_SPACES
  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 endif # M68KCLASSIC
 118
 119 if COLDFIRE
 120
 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
 128 config M5206
 129         bool "MCF5206"
 130         depends on !MMU
 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
 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
 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
 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
 164         select COLDFIRE_SW_A7
 165         select HAVE_MBAR
 166         help
 167           Motorola ColdFire 5249 processor support.
 168
 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
 177 config M5271
 178         bool "MCF5271"
 179         depends on !MMU
 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
 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
 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
 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
 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
 226         select M53xx
 227         select HAVE_CACHE_CB
 228         help
 229           Freescale (Motorola) ColdFire 532x processor support.
 230
 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
 239 config M5407
 240         bool "MCF5407"
 241         depends on !MMU
 242         select COLDFIRE_SW_A7
 243         select HAVE_CACHE_CB
 244         select HAVE_MBAR
 245         help
 246           Motorola ColdFire 5407 processor support.
 247
 248 config M547x
 249         bool "MCF547x"
 250         select M54xx
 251         select MMU_COLDFIRE if MMU
 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"
 259         select MMU_COLDFIRE if MMU
 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
 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
 274 endchoice
 275
 276 config M527x
 277         bool
 278
 279 config M53xx
 280         bool
 281
 282 config M54xx
 283         bool
 284
 285 endif # COLDFIRE
 286
 287
 288 comment "Processor Specific Options"
 289
 290 config M68KFPU_EMU
 291         bool "Math emulation support"
 292         depends on MMU
 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
 391 config CPU_HAS_NO_BITFIELDS
 392         bool
 393
 394 config CPU_HAS_NO_MULDIV64
 395         bool
 396
 397 config CPU_HAS_NO_UNALIGNED
 398         bool
 399
 400 config CPU_HAS_ADDRESS_SPACES
 401         bool
 402
 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
 421 config CLOCK_FREQ
 422         int "Set the core clock frequency"
 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
 431         default "66666666"
 432         depends on COLDFIRE
 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