1comment "Processor Type" 2 3choice 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 20config M68KCLASSIC 21 bool "Classic M68K CPU family support" 22 23config 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 32endchoice 33 34if M68KCLASSIC 35 36config 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 48config 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 56config 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 67config 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 77config 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 88config 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 97config M68328 98 bool "MC68328" 99 depends on !MMU 100 select M68000 101 help 102 Motorola 68328 processor support. 103 104config M68EZ328 105 bool "MC68EZ328" 106 depends on !MMU 107 select M68000 108 help 109 Motorola 68EX328 processor support. 110 111config M68VZ328 112 bool "MC68VZ328" 113 depends on !MMU 114 select M68000 115 help 116 Motorola 68VZ328 processor support. 117 118config M68360 119 bool "MC68360" 120 depends on !MMU 121 select MCPU32 122 help 123 Motorola 68360 processor support. 124 125endif # M68KCLASSIC 126 127if COLDFIRE 128 129config 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 137config 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 145config 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 153config 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 162config 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 170config M527x 171 bool 172 173config 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 183config 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 191config 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 201config 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 210config 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 219config M532x 220 bool "MCF532x" 221 depends on !MMU 222 select HAVE_CACHE_CB 223 help 224 Freescale (Motorola) ColdFire 532x processor support. 225 226config 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 235config M54xx 236 bool 237 238config 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 247config 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 256endif # COLDFIRE 257 258 259comment "Processor Specific Options" 260 261config 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 272config 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 283config 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 295config 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 310config 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 325config 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 335config ARCH_DISCONTIGMEM_ENABLE 336 def_bool MMU && !SINGLE_MEMORY_CHUNK 337 338config 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 353config M68K_L2_CACHE 354 bool 355 depends on MAC 356 default y 357 358config NODES_SHIFT 359 int 360 default "3" 361 depends on !SINGLE_MEMORY_CHUNK 362 363config FPU 364 bool 365 366config COLDFIRE_SW_A7 367 bool 368 369config HAVE_CACHE_SPLIT 370 bool 371 372config HAVE_CACHE_CB 373 bool 374 375config HAVE_MBAR 376 bool 377 378config HAVE_IPSBAR 379 bool 380 381config 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 393config 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 406config 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 413if HAVE_CACHE_SPLIT 414choice 415 prompt "Split Cache Configuration" 416 default CACHE_I 417 418config CACHE_I 419 bool "Instruction" 420 help 421 Use all of the ColdFire CPU cache memory as an instruction cache. 422 423config CACHE_D 424 bool "Data" 425 help 426 Use all of the ColdFire CPU cache memory as a data cache. 427 428config 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. 433endchoice 434endif 435 436if HAVE_CACHE_CB 437choice 438 prompt "Data cache mode" 439 default CACHE_WRITETHRU 440 441config CACHE_WRITETHRU 442 bool "Write-through" 443 help 444 The ColdFire CPU cache is set into Write-through mode. 445 446config CACHE_COPYBACK 447 bool "Copy-back" 448 help 449 The ColdFire CPU cache is set into Copy-back mode. 450endchoice 451endif 452 453