1comment "Processor Type" 2 3config M68000 4 bool 5 select CPU_HAS_NO_BITFIELDS 6 help 7 The Freescale (was Motorola) 68000 CPU is the first generation of 8 the well known M68K family of processors. The CPU core as well as 9 being available as a stand alone CPU was also used in many 10 System-On-Chip devices (eg 68328, 68302, etc). It does not contain 11 a paging MMU. 12 13config MCPU32 14 bool 15 select CPU_HAS_NO_BITFIELDS 16 help 17 The Freescale (was then Motorola) CPU32 is a CPU core that is 18 based on the 68020 processor. For the most part it is used in 19 System-On-Chip parts, and does not contain a paging MMU. 20 21config COLDFIRE 22 bool 23 select GENERIC_GPIO 24 select ARCH_REQUIRE_GPIOLIB 25 select CPU_HAS_NO_BITFIELDS 26 help 27 The Freescale ColdFire family of processors is a modern derivitive 28 of the 68000 processor family. They are mainly targeted at embedded 29 applications, and are all System-On-Chip (SOC) devices, as opposed 30 to stand alone CPUs. They implement a subset of the original 68000 31 processor instruction set. 32 33config M68020 34 bool "68020 support" 35 depends on MMU 36 help 37 If you anticipate running this kernel on a computer with a MC68020 38 processor, say Y. Otherwise, say N. Note that the 68020 requires a 39 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the 40 Sun 3, which provides its own version. 41 42config M68030 43 bool "68030 support" 44 depends on MMU && !MMU_SUN3 45 help 46 If you anticipate running this kernel on a computer with a MC68030 47 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not 48 work, as it does not include an MMU (Memory Management Unit). 49 50config M68040 51 bool "68040 support" 52 depends on MMU && !MMU_SUN3 53 help 54 If you anticipate running this kernel on a computer with a MC68LC040 55 or MC68040 processor, say Y. Otherwise, say N. Note that an 56 MC68EC040 will not work, as it does not include an MMU (Memory 57 Management Unit). 58 59config M68060 60 bool "68060 support" 61 depends on MMU && !MMU_SUN3 62 help 63 If you anticipate running this kernel on a computer with a MC68060 64 processor, say Y. Otherwise, say N. 65 66config M68328 67 bool "MC68328" 68 depends on !MMU 69 select M68000 70 help 71 Motorola 68328 processor support. 72 73config M68EZ328 74 bool "MC68EZ328" 75 depends on !MMU 76 select M68000 77 help 78 Motorola 68EX328 processor support. 79 80config M68VZ328 81 bool "MC68VZ328" 82 depends on !MMU 83 select M68000 84 help 85 Motorola 68VZ328 processor support. 86 87config M68360 88 bool "MC68360" 89 depends on !MMU 90 select MCPU32 91 help 92 Motorola 68360 processor support. 93 94config M5206 95 bool "MCF5206" 96 depends on !MMU 97 select COLDFIRE 98 select COLDFIRE_SW_A7 99 select HAVE_MBAR 100 help 101 Motorola ColdFire 5206 processor support. 102 103config M5206e 104 bool "MCF5206e" 105 depends on !MMU 106 select COLDFIRE 107 select COLDFIRE_SW_A7 108 select HAVE_MBAR 109 help 110 Motorola ColdFire 5206e processor support. 111 112config M520x 113 bool "MCF520x" 114 depends on !MMU 115 select COLDFIRE 116 select GENERIC_CLOCKEVENTS 117 select HAVE_CACHE_SPLIT 118 help 119 Freescale Coldfire 5207/5208 processor support. 120 121config M523x 122 bool "MCF523x" 123 depends on !MMU 124 select COLDFIRE 125 select GENERIC_CLOCKEVENTS 126 select HAVE_CACHE_SPLIT 127 select HAVE_IPSBAR 128 help 129 Freescale Coldfire 5230/1/2/4/5 processor support 130 131config M5249 132 bool "MCF5249" 133 depends on !MMU 134 select COLDFIRE 135 select COLDFIRE_SW_A7 136 select HAVE_MBAR 137 help 138 Motorola ColdFire 5249 processor support. 139 140config M527x 141 bool 142 143config M5271 144 bool "MCF5271" 145 depends on !MMU 146 select COLDFIRE 147 select M527x 148 select HAVE_CACHE_SPLIT 149 select HAVE_IPSBAR 150 select GENERIC_CLOCKEVENTS 151 help 152 Freescale (Motorola) ColdFire 5270/5271 processor support. 153 154config M5272 155 bool "MCF5272" 156 depends on !MMU 157 select COLDFIRE 158 select COLDFIRE_SW_A7 159 select HAVE_MBAR 160 help 161 Motorola ColdFire 5272 processor support. 162 163config M5275 164 bool "MCF5275" 165 depends on !MMU 166 select COLDFIRE 167 select M527x 168 select HAVE_CACHE_SPLIT 169 select HAVE_IPSBAR 170 select GENERIC_CLOCKEVENTS 171 help 172 Freescale (Motorola) ColdFire 5274/5275 processor support. 173 174config M528x 175 bool "MCF528x" 176 depends on !MMU 177 select COLDFIRE 178 select GENERIC_CLOCKEVENTS 179 select HAVE_CACHE_SPLIT 180 select HAVE_IPSBAR 181 help 182 Motorola ColdFire 5280/5282 processor support. 183 184config M5307 185 bool "MCF5307" 186 depends on !MMU 187 select COLDFIRE 188 select COLDFIRE_SW_A7 189 select HAVE_CACHE_CB 190 select HAVE_MBAR 191 help 192 Motorola ColdFire 5307 processor support. 193 194config M532x 195 bool "MCF532x" 196 depends on !MMU 197 select COLDFIRE 198 select HAVE_CACHE_CB 199 help 200 Freescale (Motorola) ColdFire 532x processor support. 201 202config M5407 203 bool "MCF5407" 204 depends on !MMU 205 select COLDFIRE 206 select COLDFIRE_SW_A7 207 select HAVE_CACHE_CB 208 select HAVE_MBAR 209 help 210 Motorola ColdFire 5407 processor support. 211 212config M54xx 213 bool 214 215config M547x 216 bool "MCF547x" 217 depends on !MMU 218 select COLDFIRE 219 select M54xx 220 select HAVE_CACHE_CB 221 select HAVE_MBAR 222 help 223 Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support. 224 225config M548x 226 bool "MCF548x" 227 depends on !MMU 228 select COLDFIRE 229 select M54xx 230 select HAVE_CACHE_CB 231 select HAVE_MBAR 232 help 233 Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support. 234 235 236comment "Processor Specific Options" 237 238config M68KFPU_EMU 239 bool "Math emulation support (EXPERIMENTAL)" 240 depends on MMU 241 depends on EXPERIMENTAL 242 help 243 At some point in the future, this will cause floating-point math 244 instructions to be emulated by the kernel on machines that lack a 245 floating-point math coprocessor. Thrill-seekers and chronically 246 sleep-deprived psychotic hacker types can say Y now, everyone else 247 should probably wait a while. 248 249config M68KFPU_EMU_EXTRAPREC 250 bool "Math emulation extra precision" 251 depends on M68KFPU_EMU 252 help 253 The fpu uses normally a few bit more during calculations for 254 correct rounding, the emulator can (often) do the same but this 255 extra calculation can cost quite some time, so you can disable 256 it here. The emulator will then "only" calculate with a 64 bit 257 mantissa and round slightly incorrect, what is more than enough 258 for normal usage. 259 260config M68KFPU_EMU_ONLY 261 bool "Math emulation only kernel" 262 depends on M68KFPU_EMU 263 help 264 This option prevents any floating-point instructions from being 265 compiled into the kernel, thereby the kernel doesn't save any 266 floating point context anymore during task switches, so this 267 kernel will only be usable on machines without a floating-point 268 math coprocessor. This makes the kernel a bit faster as no tests 269 needs to be executed whether a floating-point instruction in the 270 kernel should be executed or not. 271 272config ADVANCED 273 bool "Advanced configuration options" 274 depends on MMU 275 ---help--- 276 This gives you access to some advanced options for the CPU. The 277 defaults should be fine for most users, but these options may make 278 it possible for you to improve performance somewhat if you know what 279 you are doing. 280 281 Note that the answer to this question won't directly affect the 282 kernel: saying N will just cause the configurator to skip all 283 the questions about these options. 284 285 Most users should say N to this question. 286 287config RMW_INSNS 288 bool "Use read-modify-write instructions" 289 depends on ADVANCED 290 ---help--- 291 This allows to use certain instructions that work with indivisible 292 read-modify-write bus cycles. While this is faster than the 293 workaround of disabling interrupts, it can conflict with DMA 294 ( = direct memory access) on many Amiga systems, and it is also said 295 to destabilize other machines. It is very likely that this will 296 cause serious problems on any Amiga or Atari Medusa if set. The only 297 configuration where it should work are 68030-based Ataris, where it 298 apparently improves performance. But you've been warned! Unless you 299 really know what you are doing, say N. Try Y only if you're quite 300 adventurous. 301 302config SINGLE_MEMORY_CHUNK 303 bool "Use one physical chunk of memory only" if ADVANCED && !SUN3 304 depends on MMU 305 default y if SUN3 306 select NEED_MULTIPLE_NODES 307 help 308 Ignore all but the first contiguous chunk of physical memory for VM 309 purposes. This will save a few bytes kernel size and may speed up 310 some operations. Say N if not sure. 311 312config ARCH_DISCONTIGMEM_ENABLE 313 def_bool MMU && !SINGLE_MEMORY_CHUNK 314 315config 060_WRITETHROUGH 316 bool "Use write-through caching for 68060 supervisor accesses" 317 depends on ADVANCED && M68060 318 ---help--- 319 The 68060 generally uses copyback caching of recently accessed data. 320 Copyback caching means that memory writes will be held in an on-chip 321 cache and only written back to memory some time later. Saying Y 322 here will force supervisor (kernel) accesses to use writethrough 323 caching. Writethrough caching means that data is written to memory 324 straight away, so that cache and memory data always agree. 325 Writethrough caching is less efficient, but is needed for some 326 drivers on 68060 based systems where the 68060 bus snooping signal 327 is hardwired on. The 53c710 SCSI driver is known to suffer from 328 this problem. 329 330config M68K_L2_CACHE 331 bool 332 depends on MAC 333 default y 334 335config NODES_SHIFT 336 int 337 default "3" 338 depends on !SINGLE_MEMORY_CHUNK 339 340config FPU 341 bool 342 343config COLDFIRE_SW_A7 344 bool 345 346config HAVE_CACHE_SPLIT 347 bool 348 349config HAVE_CACHE_CB 350 bool 351 352config HAVE_MBAR 353 bool 354 355config HAVE_IPSBAR 356 bool 357 358config CLOCK_SET 359 bool "Enable setting the CPU clock frequency" 360 depends on COLDFIRE 361 default n 362 help 363 On some CPU's you do not need to know what the core CPU clock 364 frequency is. On these you can disable clock setting. On some 365 traditional 68K parts, and on all ColdFire parts you need to set 366 the appropriate CPU clock frequency. On these devices many of the 367 onboard peripherals derive their timing from the master CPU clock 368 frequency. 369 370config CLOCK_FREQ 371 int "Set the core clock frequency" 372 default "66666666" 373 depends on CLOCK_SET 374 help 375 Define the CPU clock frequency in use. This is the core clock 376 frequency, it may or may not be the same as the external clock 377 crystal fitted to your board. Some processors have an internal 378 PLL and can have their frequency programmed at run time, others 379 use internal dividers. In general the kernel won't setup a PLL 380 if it is fitted (there are some exceptions). This value will be 381 specific to the exact CPU that you are using. 382 383config OLDMASK 384 bool "Old mask 5307 (1H55J) silicon" 385 depends on M5307 386 help 387 Build support for the older revision ColdFire 5307 silicon. 388 Specifically this is the 1H55J mask revision. 389 390if HAVE_CACHE_SPLIT 391choice 392 prompt "Split Cache Configuration" 393 default CACHE_I 394 395config CACHE_I 396 bool "Instruction" 397 help 398 Use all of the ColdFire CPU cache memory as an instruction cache. 399 400config CACHE_D 401 bool "Data" 402 help 403 Use all of the ColdFire CPU cache memory as a data cache. 404 405config CACHE_BOTH 406 bool "Both" 407 help 408 Split the ColdFire CPU cache, and use half as an instruction cache 409 and half as a data cache. 410endchoice 411endif 412 413if HAVE_CACHE_CB 414choice 415 prompt "Data cache mode" 416 default CACHE_WRITETHRU 417 418config CACHE_WRITETHRU 419 bool "Write-through" 420 help 421 The ColdFire CPU cache is set into Write-through mode. 422 423config CACHE_COPYBACK 424 bool "Copy-back" 425 help 426 The ColdFire CPU cache is set into Copy-back mode. 427endchoice 428endif 429 430