1config ZONE_DMA 2 def_bool y 3 4config XTENSA 5 def_bool y 6 select ARCH_WANT_FRAME_POINTERS 7 select HAVE_IDE 8 select GENERIC_ATOMIC64 9 select GENERIC_CLOCKEVENTS 10 select VIRT_TO_BUS 11 select GENERIC_IRQ_SHOW 12 select GENERIC_SCHED_CLOCK 13 select MODULES_USE_ELF_RELA 14 select GENERIC_PCI_IOMAP 15 select ARCH_WANT_IPC_PARSE_VERSION 16 select ARCH_WANT_OPTIONAL_GPIOLIB 17 select CLONE_BACKWARDS 18 select IRQ_DOMAIN 19 select HAVE_OPROFILE 20 select HAVE_FUNCTION_TRACER 21 select HAVE_IRQ_TIME_ACCOUNTING 22 select HAVE_PERF_EVENTS 23 help 24 Xtensa processors are 32-bit RISC machines designed by Tensilica 25 primarily for embedded systems. These processors are both 26 configurable and extensible. The Linux port to the Xtensa 27 architecture supports all processor configurations and extensions, 28 with reasonable minimum requirements. The Xtensa Linux project has 29 a home page at <http://www.linux-xtensa.org/>. 30 31config RWSEM_XCHGADD_ALGORITHM 32 def_bool y 33 34config GENERIC_HWEIGHT 35 def_bool y 36 37config ARCH_HAS_ILOG2_U32 38 def_bool n 39 40config ARCH_HAS_ILOG2_U64 41 def_bool n 42 43config NO_IOPORT 44 def_bool n 45 46config HZ 47 int 48 default 100 49 50source "init/Kconfig" 51source "kernel/Kconfig.freezer" 52 53config LOCKDEP_SUPPORT 54 def_bool y 55 56config STACKTRACE_SUPPORT 57 def_bool y 58 59config TRACE_IRQFLAGS_SUPPORT 60 def_bool y 61 62config MMU 63 def_bool n 64 65config VARIANT_IRQ_SWITCH 66 def_bool n 67 68config HAVE_XTENSA_GPIO32 69 def_bool n 70 71config MAY_HAVE_SMP 72 def_bool n 73 74menu "Processor type and features" 75 76choice 77 prompt "Xtensa Processor Configuration" 78 default XTENSA_VARIANT_FSF 79 80config XTENSA_VARIANT_FSF 81 bool "fsf - default (not generic) configuration" 82 select MMU 83 select HAVE_XTENSA_GPIO32 84 85config XTENSA_VARIANT_DC232B 86 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" 87 select MMU 88 select HAVE_XTENSA_GPIO32 89 help 90 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). 91 92config XTENSA_VARIANT_DC233C 93 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)" 94 select MMU 95 select HAVE_XTENSA_GPIO32 96 help 97 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE). 98 99config XTENSA_VARIANT_S6000 100 bool "s6000 - Stretch software configurable processor" 101 select VARIANT_IRQ_SWITCH 102 select ARCH_REQUIRE_GPIOLIB 103 select XTENSA_CALIBRATE_CCOUNT 104endchoice 105 106config XTENSA_UNALIGNED_USER 107 bool "Unaligned memory access in use space" 108 help 109 The Xtensa architecture currently does not handle unaligned 110 memory accesses in hardware but through an exception handler. 111 Per default, unaligned memory accesses are disabled in user space. 112 113 Say Y here to enable unaligned memory access in user space. 114 115source "kernel/Kconfig.preempt" 116 117config HAVE_SMP 118 bool "System Supports SMP (MX)" 119 depends on MAY_HAVE_SMP 120 select XTENSA_MX 121 help 122 This option is use to indicate that the system-on-a-chip (SOC) 123 supports Multiprocessing. Multiprocessor support implemented above 124 the CPU core definition and currently needs to be selected manually. 125 126 Multiprocessor support in implemented with external cache and 127 interrupt controlers. 128 129 The MX interrupt distributer adds Interprocessor Interrupts 130 and causes the IRQ numbers to be increased by 4 for devices 131 like the open cores ethernet driver and the serial interface. 132 133 You still have to select "Enable SMP" to enable SMP on this SOC. 134 135config SMP 136 bool "Enable Symmetric multi-processing support" 137 depends on HAVE_SMP 138 select USE_GENERIC_SMP_HELPERS 139 select GENERIC_SMP_IDLE_THREAD 140 help 141 Enabled SMP Software; allows more than one CPU/CORE 142 to be activated during startup. 143 144config NR_CPUS 145 depends on SMP 146 int "Maximum number of CPUs (2-32)" 147 range 2 32 148 default "4" 149 150config HOTPLUG_CPU 151 bool "Enable CPU hotplug support" 152 depends on SMP 153 help 154 Say Y here to allow turning CPUs off and on. CPUs can be 155 controlled through /sys/devices/system/cpu. 156 157 Say N if you want to disable CPU hotplug. 158 159config MATH_EMULATION 160 bool "Math emulation" 161 help 162 Can we use information of configuration file? 163 164config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 165 bool "Initialize Xtensa MMU inside the Linux kernel code" 166 default y 167 help 168 Earlier version initialized the MMU in the exception vector 169 before jumping to _startup in head.S and had an advantage that 170 it was possible to place a software breakpoint at 'reset' and 171 then enter your normal kernel breakpoints once the MMU was mapped 172 to the kernel mappings (0XC0000000). 173 174 This unfortunately doesn't work for U-Boot and likley also wont 175 work for using KEXEC to have a hot kernel ready for doing a 176 KDUMP. 177 178 So now the MMU is initialized in head.S but it's necessary to 179 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup. 180 xt-gdb can't place a Software Breakpoint in the 0XD region prior 181 to mapping the MMU and after mapping even if the area of low memory 182 was mapped gdb wouldn't remove the breakpoint on hitting it as the 183 PC wouldn't match. Since Hardware Breakpoints are recommended for 184 Linux configurations it seems reasonable to just assume they exist 185 and leave this older mechanism for unfortunate souls that choose 186 not to follow Tensilica's recommendation. 187 188 Selecting this will cause U-Boot to set the KERNEL Load and Entry 189 address at 0x00003000 instead of the mapped std of 0xD0003000. 190 191 If in doubt, say Y. 192 193endmenu 194 195config XTENSA_CALIBRATE_CCOUNT 196 def_bool n 197 help 198 On some platforms (XT2000, for example), the CPU clock rate can 199 vary. The frequency can be determined, however, by measuring 200 against a well known, fixed frequency, such as an UART oscillator. 201 202config SERIAL_CONSOLE 203 def_bool n 204 205menu "Bus options" 206 207config PCI 208 bool "PCI support" 209 default y 210 help 211 Find out whether you have a PCI motherboard. PCI is the name of a 212 bus system, i.e. the way the CPU talks to the other stuff inside 213 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 214 VESA. If you have PCI, say Y, otherwise N. 215 216source "drivers/pci/Kconfig" 217 218endmenu 219 220menu "Platform options" 221 222choice 223 prompt "Xtensa System Type" 224 default XTENSA_PLATFORM_ISS 225 226config XTENSA_PLATFORM_ISS 227 bool "ISS" 228 depends on TTY 229 select XTENSA_CALIBRATE_CCOUNT 230 select SERIAL_CONSOLE 231 help 232 ISS is an acronym for Tensilica's Instruction Set Simulator. 233 234config XTENSA_PLATFORM_XT2000 235 bool "XT2000" 236 help 237 XT2000 is the name of Tensilica's feature-rich emulation platform. 238 This hardware is capable of running a full Linux distribution. 239 240config XTENSA_PLATFORM_S6105 241 bool "S6105" 242 select SERIAL_CONSOLE 243 select NO_IOPORT 244 245config XTENSA_PLATFORM_XTFPGA 246 bool "XTFPGA" 247 select SERIAL_CONSOLE 248 select ETHOC 249 select XTENSA_CALIBRATE_CCOUNT 250 help 251 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605). 252 This hardware is capable of running a full Linux distribution. 253 254endchoice 255 256 257config XTENSA_CPU_CLOCK 258 int "CPU clock rate [MHz]" 259 depends on !XTENSA_CALIBRATE_CCOUNT 260 default 16 261 262config GENERIC_CALIBRATE_DELAY 263 bool "Auto calibration of the BogoMIPS value" 264 help 265 The BogoMIPS value can easily be derived from the CPU frequency. 266 267config CMDLINE_BOOL 268 bool "Default bootloader kernel arguments" 269 270config CMDLINE 271 string "Initial kernel command string" 272 depends on CMDLINE_BOOL 273 default "console=ttyS0,38400 root=/dev/ram" 274 help 275 On some architectures (EBSA110 and CATS), there is currently no way 276 for the boot loader to pass arguments to the kernel. For these 277 architectures, you should supply some command-line options at build 278 time by entering them here. As a minimum, you should specify the 279 memory size and the root device (e.g., mem=64M root=/dev/nfs). 280 281config USE_OF 282 bool "Flattened Device Tree support" 283 select OF 284 select OF_EARLY_FLATTREE 285 help 286 Include support for flattened device tree machine descriptions. 287 288config BUILTIN_DTB 289 string "DTB to build into the kernel image" 290 depends on OF 291 292config BLK_DEV_SIMDISK 293 tristate "Host file-based simulated block device support" 294 default n 295 depends on XTENSA_PLATFORM_ISS 296 help 297 Create block devices that map to files in the host file system. 298 Device binding to host file may be changed at runtime via proc 299 interface provided the device is not in use. 300 301config BLK_DEV_SIMDISK_COUNT 302 int "Number of host file-based simulated block devices" 303 range 1 10 304 depends on BLK_DEV_SIMDISK 305 default 2 306 help 307 This is the default minimal number of created block devices. 308 Kernel/module parameter 'simdisk_count' may be used to change this 309 value at runtime. More file names (but no more than 10) may be 310 specified as parameters, simdisk_count grows accordingly. 311 312config SIMDISK0_FILENAME 313 string "Host filename for the first simulated device" 314 depends on BLK_DEV_SIMDISK = y 315 default "" 316 help 317 Attach a first simdisk to a host file. Conventionally, this file 318 contains a root file system. 319 320config SIMDISK1_FILENAME 321 string "Host filename for the second simulated device" 322 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1 323 default "" 324 help 325 Another simulated disk in a host file for a buildroot-independent 326 storage. 327 328source "mm/Kconfig" 329 330source "drivers/pcmcia/Kconfig" 331 332source "drivers/pci/hotplug/Kconfig" 333 334endmenu 335 336menu "Executable file formats" 337 338source "fs/Kconfig.binfmt" 339 340endmenu 341 342source "net/Kconfig" 343 344source "drivers/Kconfig" 345 346source "fs/Kconfig" 347 348source "arch/xtensa/Kconfig.debug" 349 350source "security/Kconfig" 351 352source "crypto/Kconfig" 353 354source "lib/Kconfig" 355 356 357