1config ZONE_DMA 2 def_bool y 3 4config XTENSA 5 def_bool y 6 select ARCH_WANT_FRAME_POINTERS 7 select ARCH_WANT_IPC_PARSE_VERSION 8 select ARCH_WANT_OPTIONAL_GPIOLIB 9 select BUILDTIME_EXTABLE_SORT 10 select CLONE_BACKWARDS 11 select COMMON_CLK 12 select GENERIC_ATOMIC64 13 select GENERIC_CLOCKEVENTS 14 select GENERIC_IRQ_SHOW 15 select GENERIC_PCI_IOMAP 16 select GENERIC_SCHED_CLOCK 17 select HAVE_FUNCTION_TRACER 18 select HAVE_IRQ_TIME_ACCOUNTING 19 select HAVE_OPROFILE 20 select HAVE_PERF_EVENTS 21 select IRQ_DOMAIN 22 select MODULES_USE_ELF_RELA 23 select VIRT_TO_BUS 24 help 25 Xtensa processors are 32-bit RISC machines designed by Tensilica 26 primarily for embedded systems. These processors are both 27 configurable and extensible. The Linux port to the Xtensa 28 architecture supports all processor configurations and extensions, 29 with reasonable minimum requirements. The Xtensa Linux project has 30 a home page at <http://www.linux-xtensa.org/>. 31 32config RWSEM_XCHGADD_ALGORITHM 33 def_bool y 34 35config GENERIC_HWEIGHT 36 def_bool y 37 38config ARCH_HAS_ILOG2_U32 39 def_bool n 40 41config ARCH_HAS_ILOG2_U64 42 def_bool n 43 44config NO_IOPORT_MAP 45 def_bool n 46 47config HZ 48 int 49 default 100 50 51source "init/Kconfig" 52source "kernel/Kconfig.freezer" 53 54config LOCKDEP_SUPPORT 55 def_bool y 56 57config STACKTRACE_SUPPORT 58 def_bool y 59 60config TRACE_IRQFLAGS_SUPPORT 61 def_bool y 62 63config MMU 64 bool 65 default n if !XTENSA_VARIANT_CUSTOM 66 default XTENSA_VARIANT_MMU if XTENSA_VARIANT_CUSTOM 67 68config VARIANT_IRQ_SWITCH 69 def_bool n 70 71config HAVE_XTENSA_GPIO32 72 def_bool n 73 74config MAY_HAVE_SMP 75 def_bool n 76 77menu "Processor type and features" 78 79choice 80 prompt "Xtensa Processor Configuration" 81 default XTENSA_VARIANT_FSF 82 83config XTENSA_VARIANT_FSF 84 bool "fsf - default (not generic) configuration" 85 select MMU 86 87config XTENSA_VARIANT_DC232B 88 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" 89 select MMU 90 select HAVE_XTENSA_GPIO32 91 help 92 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). 93 94config XTENSA_VARIANT_DC233C 95 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)" 96 select MMU 97 select HAVE_XTENSA_GPIO32 98 help 99 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE). 100 101config XTENSA_VARIANT_CUSTOM 102 bool "Custom Xtensa processor configuration" 103 select MAY_HAVE_SMP 104 select HAVE_XTENSA_GPIO32 105 help 106 Select this variant to use a custom Xtensa processor configuration. 107 You will be prompted for a processor variant CORENAME. 108endchoice 109 110config XTENSA_VARIANT_CUSTOM_NAME 111 string "Xtensa Processor Custom Core Variant Name" 112 depends on XTENSA_VARIANT_CUSTOM 113 help 114 Provide the name of a custom Xtensa processor variant. 115 This CORENAME selects arch/xtensa/variant/CORENAME. 116 Dont forget you have to select MMU if you have one. 117 118config XTENSA_VARIANT_NAME 119 string 120 default "dc232b" if XTENSA_VARIANT_DC232B 121 default "dc233c" if XTENSA_VARIANT_DC233C 122 default "fsf" if XTENSA_VARIANT_FSF 123 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM 124 125config XTENSA_VARIANT_MMU 126 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)" 127 depends on XTENSA_VARIANT_CUSTOM 128 default y 129 help 130 Build a Conventional Kernel with full MMU support, 131 ie: it supports a TLB with auto-loading, page protection. 132 133config XTENSA_UNALIGNED_USER 134 bool "Unaligned memory access in use space" 135 help 136 The Xtensa architecture currently does not handle unaligned 137 memory accesses in hardware but through an exception handler. 138 Per default, unaligned memory accesses are disabled in user space. 139 140 Say Y here to enable unaligned memory access in user space. 141 142source "kernel/Kconfig.preempt" 143 144config HAVE_SMP 145 bool "System Supports SMP (MX)" 146 depends on MAY_HAVE_SMP 147 select XTENSA_MX 148 help 149 This option is use to indicate that the system-on-a-chip (SOC) 150 supports Multiprocessing. Multiprocessor support implemented above 151 the CPU core definition and currently needs to be selected manually. 152 153 Multiprocessor support in implemented with external cache and 154 interrupt controlers. 155 156 The MX interrupt distributer adds Interprocessor Interrupts 157 and causes the IRQ numbers to be increased by 4 for devices 158 like the open cores ethernet driver and the serial interface. 159 160 You still have to select "Enable SMP" to enable SMP on this SOC. 161 162config SMP 163 bool "Enable Symmetric multi-processing support" 164 depends on HAVE_SMP 165 select GENERIC_SMP_IDLE_THREAD 166 help 167 Enabled SMP Software; allows more than one CPU/CORE 168 to be activated during startup. 169 170config NR_CPUS 171 depends on SMP 172 int "Maximum number of CPUs (2-32)" 173 range 2 32 174 default "4" 175 176config HOTPLUG_CPU 177 bool "Enable CPU hotplug support" 178 depends on SMP 179 help 180 Say Y here to allow turning CPUs off and on. CPUs can be 181 controlled through /sys/devices/system/cpu. 182 183 Say N if you want to disable CPU hotplug. 184 185config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 186 bool "Initialize Xtensa MMU inside the Linux kernel code" 187 default y 188 help 189 Earlier version initialized the MMU in the exception vector 190 before jumping to _startup in head.S and had an advantage that 191 it was possible to place a software breakpoint at 'reset' and 192 then enter your normal kernel breakpoints once the MMU was mapped 193 to the kernel mappings (0XC0000000). 194 195 This unfortunately doesn't work for U-Boot and likley also wont 196 work for using KEXEC to have a hot kernel ready for doing a 197 KDUMP. 198 199 So now the MMU is initialized in head.S but it's necessary to 200 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup. 201 xt-gdb can't place a Software Breakpoint in the 0XD region prior 202 to mapping the MMU and after mapping even if the area of low memory 203 was mapped gdb wouldn't remove the breakpoint on hitting it as the 204 PC wouldn't match. Since Hardware Breakpoints are recommended for 205 Linux configurations it seems reasonable to just assume they exist 206 and leave this older mechanism for unfortunate souls that choose 207 not to follow Tensilica's recommendation. 208 209 Selecting this will cause U-Boot to set the KERNEL Load and Entry 210 address at 0x00003000 instead of the mapped std of 0xD0003000. 211 212 If in doubt, say Y. 213 214config HIGHMEM 215 bool "High Memory Support" 216 depends on MMU 217 help 218 Linux can use the full amount of RAM in the system by 219 default. However, the default MMUv2 setup only maps the 220 lowermost 128 MB of memory linearly to the areas starting 221 at 0xd0000000 (cached) and 0xd8000000 (uncached). 222 When there are more than 128 MB memory in the system not 223 all of it can be "permanently mapped" by the kernel. 224 The physical memory that's not permanently mapped is called 225 "high memory". 226 227 If you are compiling a kernel which will never run on a 228 machine with more than 128 MB total physical RAM, answer 229 N here. 230 231 If unsure, say Y. 232 233config FAST_SYSCALL_XTENSA 234 bool "Enable fast atomic syscalls" 235 default n 236 help 237 fast_syscall_xtensa is a syscall that can make atomic operations 238 on UP kernel when processor has no s32c1i support. 239 240 This syscall is deprecated. It may have issues when called with 241 invalid arguments. It is provided only for backwards compatibility. 242 Only enable it if your userspace software requires it. 243 244 If unsure, say N. 245 246config FAST_SYSCALL_SPILL_REGISTERS 247 bool "Enable spill registers syscall" 248 default n 249 help 250 fast_syscall_spill_registers is a syscall that spills all active 251 register windows of a calling userspace task onto its stack. 252 253 This syscall is deprecated. It may have issues when called with 254 invalid arguments. It is provided only for backwards compatibility. 255 Only enable it if your userspace software requires it. 256 257 If unsure, say N. 258 259endmenu 260 261config XTENSA_CALIBRATE_CCOUNT 262 def_bool n 263 help 264 On some platforms (XT2000, for example), the CPU clock rate can 265 vary. The frequency can be determined, however, by measuring 266 against a well known, fixed frequency, such as an UART oscillator. 267 268config SERIAL_CONSOLE 269 def_bool n 270 271menu "Bus options" 272 273config PCI 274 bool "PCI support" 275 default y 276 help 277 Find out whether you have a PCI motherboard. PCI is the name of a 278 bus system, i.e. the way the CPU talks to the other stuff inside 279 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 280 VESA. If you have PCI, say Y, otherwise N. 281 282source "drivers/pci/Kconfig" 283 284endmenu 285 286menu "Platform options" 287 288choice 289 prompt "Xtensa System Type" 290 default XTENSA_PLATFORM_ISS 291 292config XTENSA_PLATFORM_ISS 293 bool "ISS" 294 select XTENSA_CALIBRATE_CCOUNT 295 select SERIAL_CONSOLE 296 help 297 ISS is an acronym for Tensilica's Instruction Set Simulator. 298 299config XTENSA_PLATFORM_XT2000 300 bool "XT2000" 301 select HAVE_IDE 302 help 303 XT2000 is the name of Tensilica's feature-rich emulation platform. 304 This hardware is capable of running a full Linux distribution. 305 306config XTENSA_PLATFORM_XTFPGA 307 bool "XTFPGA" 308 select ETHOC if ETHERNET 309 select PLATFORM_WANT_DEFAULT_MEM 310 select SERIAL_CONSOLE 311 select XTENSA_CALIBRATE_CCOUNT 312 help 313 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605). 314 This hardware is capable of running a full Linux distribution. 315 316endchoice 317 318 319config XTENSA_CPU_CLOCK 320 int "CPU clock rate [MHz]" 321 depends on !XTENSA_CALIBRATE_CCOUNT 322 default 16 323 324config GENERIC_CALIBRATE_DELAY 325 bool "Auto calibration of the BogoMIPS value" 326 help 327 The BogoMIPS value can easily be derived from the CPU frequency. 328 329config CMDLINE_BOOL 330 bool "Default bootloader kernel arguments" 331 332config CMDLINE 333 string "Initial kernel command string" 334 depends on CMDLINE_BOOL 335 default "console=ttyS0,38400 root=/dev/ram" 336 help 337 On some architectures (EBSA110 and CATS), there is currently no way 338 for the boot loader to pass arguments to the kernel. For these 339 architectures, you should supply some command-line options at build 340 time by entering them here. As a minimum, you should specify the 341 memory size and the root device (e.g., mem=64M root=/dev/nfs). 342 343config USE_OF 344 bool "Flattened Device Tree support" 345 select OF 346 select OF_EARLY_FLATTREE 347 help 348 Include support for flattened device tree machine descriptions. 349 350config BUILTIN_DTB 351 string "DTB to build into the kernel image" 352 depends on OF 353 354config BLK_DEV_SIMDISK 355 tristate "Host file-based simulated block device support" 356 default n 357 depends on XTENSA_PLATFORM_ISS && BLOCK 358 help 359 Create block devices that map to files in the host file system. 360 Device binding to host file may be changed at runtime via proc 361 interface provided the device is not in use. 362 363config BLK_DEV_SIMDISK_COUNT 364 int "Number of host file-based simulated block devices" 365 range 1 10 366 depends on BLK_DEV_SIMDISK 367 default 2 368 help 369 This is the default minimal number of created block devices. 370 Kernel/module parameter 'simdisk_count' may be used to change this 371 value at runtime. More file names (but no more than 10) may be 372 specified as parameters, simdisk_count grows accordingly. 373 374config SIMDISK0_FILENAME 375 string "Host filename for the first simulated device" 376 depends on BLK_DEV_SIMDISK = y 377 default "" 378 help 379 Attach a first simdisk to a host file. Conventionally, this file 380 contains a root file system. 381 382config SIMDISK1_FILENAME 383 string "Host filename for the second simulated device" 384 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1 385 default "" 386 help 387 Another simulated disk in a host file for a buildroot-independent 388 storage. 389 390source "mm/Kconfig" 391 392source "drivers/pcmcia/Kconfig" 393 394source "drivers/pci/hotplug/Kconfig" 395 396config PLATFORM_WANT_DEFAULT_MEM 397 def_bool n 398 399config DEFAULT_MEM_START 400 hex "Physical address of the default memory area start" 401 depends on PLATFORM_WANT_DEFAULT_MEM 402 default 0x00000000 if MMU 403 default 0x40000000 if !MMU 404 help 405 This is a fallback start address of the default memory area, it is 406 used when no physical memory size is passed through DTB or through 407 boot parameter from bootloader. 408 409 In noMMU configuration the following parameters are derived from it: 410 - kernel load address; 411 - kernel entry point address; 412 - relocatable vectors base address; 413 - uBoot load address; 414 - TASK_SIZE. 415 416 If unsure, leave the default value here. 417 418config DEFAULT_MEM_SIZE 419 hex "Maximal size of the default memory area" 420 depends on PLATFORM_WANT_DEFAULT_MEM 421 default 0x04000000 422 help 423 This is a fallback size of the default memory area, it is used when 424 no physical memory size is passed through DTB or through boot 425 parameter from bootloader. 426 427 It's also used for TASK_SIZE calculation in noMMU configuration. 428 429 If unsure, leave the default value here. 430 431endmenu 432 433menu "Executable file formats" 434 435source "fs/Kconfig.binfmt" 436 437endmenu 438 439menu "Power management options" 440 441source "kernel/power/Kconfig" 442 443endmenu 444 445source "net/Kconfig" 446 447source "drivers/Kconfig" 448 449source "fs/Kconfig" 450 451source "arch/xtensa/Kconfig.debug" 452 453source "security/Kconfig" 454 455source "crypto/Kconfig" 456 457source "lib/Kconfig" 458 459 460