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 config M68360
 118         bool "MC68360"
 119         depends on !MMU
 120         select MCPU32
 121         help
 122           Motorola 68360 processor support.
 123
 124 endif # M68KCLASSIC
 125
 126 if COLDFIRE
 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 M527x
 178         bool
 179
 180 config M5271
 181         bool "MCF5271"
 182         depends on !MMU
 183         select M527x
 184         select HAVE_CACHE_SPLIT
 185         select HAVE_IPSBAR
 186         select GENERIC_CLOCKEVENTS
 187         help
 188           Freescale (Motorola) ColdFire 5270/5271 processor support.
 189
 190 config M5272
 191         bool "MCF5272"
 192         depends on !MMU
 193         select COLDFIRE_SW_A7
 194         select HAVE_MBAR
 195         help
 196           Motorola ColdFire 5272 processor support.
 197
 198 config M5275
 199         bool "MCF5275"
 200         depends on !MMU
 201         select M527x
 202         select HAVE_CACHE_SPLIT
 203         select HAVE_IPSBAR
 204         select GENERIC_CLOCKEVENTS
 205         help
 206           Freescale (Motorola) ColdFire 5274/5275 processor support.
 207
 208 config M528x
 209         bool "MCF528x"
 210         depends on !MMU
 211         select GENERIC_CLOCKEVENTS
 212         select HAVE_CACHE_SPLIT
 213         select HAVE_IPSBAR
 214         help
 215           Motorola ColdFire 5280/5282 processor support.
 216
 217 config M5307
 218         bool "MCF5307"
 219         depends on !MMU
 220         select COLDFIRE_SW_A7
 221         select HAVE_CACHE_CB
 222         select HAVE_MBAR
 223         help
 224           Motorola ColdFire 5307 processor support.
 225
 226 config M532x
 227         bool "MCF532x"
 228         depends on !MMU
 229         select HAVE_CACHE_CB
 230         help
 231           Freescale (Motorola) ColdFire 532x processor support.
 232
 233 config M5407
 234         bool "MCF5407"
 235         depends on !MMU
 236         select COLDFIRE_SW_A7
 237         select HAVE_CACHE_CB
 238         select HAVE_MBAR
 239         help
 240           Motorola ColdFire 5407 processor support.
 241
 242 config M54xx
 243         bool
 244
 245 config M547x
 246         bool "MCF547x"
 247         select M54xx
 248         select MMU_COLDFIRE if MMU
 249         select HAVE_CACHE_CB
 250         select HAVE_MBAR
 251         help
 252           Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.
 253
 254 config M548x
 255         bool "MCF548x"
 256         select MMU_COLDFIRE if MMU
 257         select M54xx
 258         select HAVE_CACHE_CB
 259         select HAVE_MBAR
 260         help
 261           Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
 262
 263 config M5441x
 264         bool "MCF5441x"
 265         depends on !MMU
 266         select GENERIC_CLOCKEVENTS
 267         select HAVE_CACHE_CB
 268         help
 269           Freescale Coldfire 54410/54415/54416/54417/54418 processor support.
 270
 271 endif # COLDFIRE
 272
 273
 274 comment "Processor Specific Options"
 275
 276 config M68KFPU_EMU
 277         bool "Math emulation support"
 278         depends on MMU
 279         help
 280           At some point in the future, this will cause floating-point math
 281           instructions to be emulated by the kernel on machines that lack a
 282           floating-point math coprocessor.  Thrill-seekers and chronically
 283           sleep-deprived psychotic hacker types can say Y now, everyone else
 284           should probably wait a while.
 285
 286 config M68KFPU_EMU_EXTRAPREC
 287         bool "Math emulation extra precision"
 288         depends on M68KFPU_EMU
 289         help
 290           The fpu uses normally a few bit more during calculations for
 291           correct rounding, the emulator can (often) do the same but this
 292           extra calculation can cost quite some time, so you can disable
 293           it here. The emulator will then "only" calculate with a 64 bit
 294           mantissa and round slightly incorrect, what is more than enough
 295           for normal usage.
 296
 297 config M68KFPU_EMU_ONLY
 298         bool "Math emulation only kernel"
 299         depends on M68KFPU_EMU
 300         help
 301           This option prevents any floating-point instructions from being
 302           compiled into the kernel, thereby the kernel doesn't save any
 303           floating point context anymore during task switches, so this
 304           kernel will only be usable on machines without a floating-point
 305           math coprocessor. This makes the kernel a bit faster as no tests
 306           needs to be executed whether a floating-point instruction in the
 307           kernel should be executed or not.
 308
 309 config ADVANCED
 310         bool "Advanced configuration options"
 311         depends on MMU
 312         ---help---
 313           This gives you access to some advanced options for the CPU. The
 314           defaults should be fine for most users, but these options may make
 315           it possible for you to improve performance somewhat if you know what
 316           you are doing.
 317
 318           Note that the answer to this question won't directly affect the
 319           kernel: saying N will just cause the configurator to skip all
 320           the questions about these options.
 321
 322           Most users should say N to this question.
 323
 324 config RMW_INSNS
 325         bool "Use read-modify-write instructions"
 326         depends on ADVANCED
 327         ---help---
 328           This allows to use certain instructions that work with indivisible
 329           read-modify-write bus cycles. While this is faster than the
 330           workaround of disabling interrupts, it can conflict with DMA
 331           ( = direct memory access) on many Amiga systems, and it is also said
 332           to destabilize other machines. It is very likely that this will
 333           cause serious problems on any Amiga or Atari Medusa if set. The only
 334           configuration where it should work are 68030-based Ataris, where it
 335           apparently improves performance. But you've been warned! Unless you
 336           really know what you are doing, say N. Try Y only if you're quite
 337           adventurous.
 338
 339 config SINGLE_MEMORY_CHUNK
 340         bool "Use one physical chunk of memory only" if ADVANCED && !SUN3
 341         depends on MMU
 342         default y if SUN3
 343         select NEED_MULTIPLE_NODES
 344         help
 345           Ignore all but the first contiguous chunk of physical memory for VM
 346           purposes.  This will save a few bytes kernel size and may speed up
 347           some operations.  Say N if not sure.
 348
 349 config ARCH_DISCONTIGMEM_ENABLE
 350         def_bool MMU && !SINGLE_MEMORY_CHUNK
 351
 352 config 060_WRITETHROUGH
 353         bool "Use write-through caching for 68060 supervisor accesses"
 354         depends on ADVANCED && M68060
 355         ---help---
 356           The 68060 generally uses copyback caching of recently accessed data.
 357           Copyback caching means that memory writes will be held in an on-chip
 358           cache and only written back to memory some time later.  Saying Y
 359           here will force supervisor (kernel) accesses to use writethrough
 360           caching.  Writethrough caching means that data is written to memory
 361           straight away, so that cache and memory data always agree.
 362           Writethrough caching is less efficient, but is needed for some
 363           drivers on 68060 based systems where the 68060 bus snooping signal
 364           is hardwired on.  The 53c710 SCSI driver is known to suffer from
 365           this problem.
 366
 367 config M68K_L2_CACHE
 368         bool
 369         depends on MAC
 370         default y
 371
 372 config NODES_SHIFT
 373         int
 374         default "3"
 375         depends on !SINGLE_MEMORY_CHUNK
 376
 377 config CPU_HAS_NO_BITFIELDS
 378         bool
 379
 380 config CPU_HAS_NO_MULDIV64
 381         bool
 382
 383 config CPU_HAS_NO_UNALIGNED
 384         bool
 385
 386 config CPU_HAS_ADDRESS_SPACES
 387         bool
 388
 389 config FPU
 390         bool
 391
 392 config COLDFIRE_SW_A7
 393         bool
 394
 395 config HAVE_CACHE_SPLIT
 396         bool
 397
 398 config HAVE_CACHE_CB
 399         bool
 400
 401 config HAVE_MBAR
 402         bool
 403
 404 config HAVE_IPSBAR
 405         bool
 406
 407 config CLOCK_SET
 408         bool "Enable setting the CPU clock frequency"
 409         depends on COLDFIRE
 410         default n
 411         help
 412           On some CPU's you do not need to know what the core CPU clock
 413           frequency is. On these you can disable clock setting. On some
 414           traditional 68K parts, and on all ColdFire parts you need to set
 415           the appropriate CPU clock frequency. On these devices many of the
 416           onboard peripherals derive their timing from the master CPU clock
 417           frequency.
 418
 419 config CLOCK_FREQ
 420         int "Set the core clock frequency"
 421         default "66666666"
 422         depends on CLOCK_SET
 423         help
 424           Define the CPU clock frequency in use. This is the core clock
 425           frequency, it may or may not be the same as the external clock
 426           crystal fitted to your board. Some processors have an internal
 427           PLL and can have their frequency programmed at run time, others
 428           use internal dividers. In general the kernel won't setup a PLL
 429           if it is fitted (there are some exceptions). This value will be
 430           specific to the exact CPU that you are using.
 431
 432 config OLDMASK
 433         bool "Old mask 5307 (1H55J) silicon"
 434         depends on M5307
 435         help
 436           Build support for the older revision ColdFire 5307 silicon.
 437           Specifically this is the 1H55J mask revision.
 438
 439 if HAVE_CACHE_SPLIT
 440 choice
 441         prompt "Split Cache Configuration"
 442         default CACHE_I
 443
 444 config CACHE_I
 445         bool "Instruction"
 446         help
 447           Use all of the ColdFire CPU cache memory as an instruction cache.
 448
 449 config CACHE_D
 450         bool "Data"
 451         help
 452           Use all of the ColdFire CPU cache memory as a data cache.
 453
 454 config CACHE_BOTH
 455         bool "Both"
 456         help
 457           Split the ColdFire CPU cache, and use half as an instruction cache
 458           and half as a data cache.
 459 endchoice
 460 endif
 461
 462 if HAVE_CACHE_CB
 463 choice
 464         prompt "Data cache mode"
 465         default CACHE_WRITETHRU
 466
 467 config CACHE_WRITETHRU
 468         bool "Write-through"
 469         help
 470           The ColdFire CPU cache is set into Write-through mode.
 471
 472 config CACHE_COPYBACK
 473         bool "Copy-back"
 474         help
 475           The ColdFire CPU cache is set into Copy-back mode.
 476 endchoice
 477 endif
 478