arch/xtensa/Kconfig

   1 config ZONE_DMA
   2         def_bool y
   3
   4 config 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
  32 config RWSEM_XCHGADD_ALGORITHM
  33         def_bool y
  34
  35 config GENERIC_HWEIGHT
  36         def_bool y
  37
  38 config ARCH_HAS_ILOG2_U32
  39         def_bool n
  40
  41 config ARCH_HAS_ILOG2_U64
  42         def_bool n
  43
  44 config NO_IOPORT_MAP
  45         def_bool n
  46
  47 config HZ
  48         int
  49         default 100
  50
  51 source "init/Kconfig"
  52 source "kernel/Kconfig.freezer"
  53
  54 config LOCKDEP_SUPPORT
  55         def_bool y
  56
  57 config STACKTRACE_SUPPORT
  58         def_bool y
  59
  60 config TRACE_IRQFLAGS_SUPPORT
  61         def_bool y
  62
  63 config MMU
  64         bool
  65         default n if !XTENSA_VARIANT_CUSTOM
  66         default XTENSA_VARIANT_MMU if XTENSA_VARIANT_CUSTOM
  67
  68 config VARIANT_IRQ_SWITCH
  69         def_bool n
  70
  71 config HAVE_XTENSA_GPIO32
  72         def_bool n
  73
  74 config MAY_HAVE_SMP
  75         def_bool n
  76
  77 menu "Processor type and features"
  78
  79 choice
  80         prompt "Xtensa Processor Configuration"
  81         default XTENSA_VARIANT_FSF
  82
  83 config XTENSA_VARIANT_FSF
  84         bool "fsf - default (not generic) configuration"
  85         select MMU
  86
  87 config 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
  94 config 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
 101 config XTENSA_VARIANT_S6000
 102         bool "s6000 - Stretch software configurable processor"
 103         select VARIANT_IRQ_SWITCH
 104         select ARCH_REQUIRE_GPIOLIB
 105         select XTENSA_CALIBRATE_CCOUNT
 106
 107 config XTENSA_VARIANT_CUSTOM
 108         bool "Custom Xtensa processor configuration"
 109         select MAY_HAVE_SMP
 110         select HAVE_XTENSA_GPIO32
 111         help
 112           Select this variant to use a custom Xtensa processor configuration.
 113           You will be prompted for a processor variant CORENAME.
 114 endchoice
 115
 116 config XTENSA_VARIANT_CUSTOM_NAME
 117         string "Xtensa Processor Custom Core Variant Name"
 118         depends on XTENSA_VARIANT_CUSTOM
 119         help
 120           Provide the name of a custom Xtensa processor variant.
 121           This CORENAME selects arch/xtensa/variant/CORENAME.
 122           Dont forget you have to select MMU if you have one.
 123
 124 config XTENSA_VARIANT_NAME
 125         string
 126         default "dc232b"                        if XTENSA_VARIANT_DC232B
 127         default "dc233c"                        if XTENSA_VARIANT_DC233C
 128         default "fsf"                           if XTENSA_VARIANT_FSF
 129         default "s6000"                         if XTENSA_VARIANT_S6000
 130         default XTENSA_VARIANT_CUSTOM_NAME      if XTENSA_VARIANT_CUSTOM
 131
 132 config XTENSA_VARIANT_MMU
 133         bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
 134         depends on XTENSA_VARIANT_CUSTOM
 135         default y
 136         help
 137           Build a Conventional Kernel with full MMU support,
 138           ie: it supports a TLB with auto-loading, page protection.
 139
 140 config XTENSA_UNALIGNED_USER
 141         bool "Unaligned memory access in use space"
 142         help
 143           The Xtensa architecture currently does not handle unaligned
 144           memory accesses in hardware but through an exception handler.
 145           Per default, unaligned memory accesses are disabled in user space.
 146
 147           Say Y here to enable unaligned memory access in user space.
 148
 149 source "kernel/Kconfig.preempt"
 150
 151 config HAVE_SMP
 152         bool "System Supports SMP (MX)"
 153         depends on MAY_HAVE_SMP
 154         select XTENSA_MX
 155         help
 156           This option is use to indicate that the system-on-a-chip (SOC)
 157           supports Multiprocessing. Multiprocessor support implemented above
 158           the CPU core definition and currently needs to be selected manually.
 159
 160           Multiprocessor support in implemented with external cache and
 161           interrupt controlers.
 162
 163           The MX interrupt distributer adds Interprocessor Interrupts
 164           and causes the IRQ numbers to be increased by 4 for devices
 165           like the open cores ethernet driver and the serial interface.
 166
 167           You still have to select "Enable SMP" to enable SMP on this SOC.
 168
 169 config SMP
 170         bool "Enable Symmetric multi-processing support"
 171         depends on HAVE_SMP
 172         select GENERIC_SMP_IDLE_THREAD
 173         help
 174           Enabled SMP Software; allows more than one CPU/CORE
 175           to be activated during startup.
 176
 177 config NR_CPUS
 178         depends on SMP
 179         int "Maximum number of CPUs (2-32)"
 180         range 2 32
 181         default "4"
 182
 183 config HOTPLUG_CPU
 184         bool "Enable CPU hotplug support"
 185         depends on SMP
 186         help
 187           Say Y here to allow turning CPUs off and on. CPUs can be
 188           controlled through /sys/devices/system/cpu.
 189
 190           Say N if you want to disable CPU hotplug.
 191
 192 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 193         bool "Initialize Xtensa MMU inside the Linux kernel code"
 194         depends on MMU
 195         default y
 196         help
 197           Earlier version initialized the MMU in the exception vector
 198           before jumping to _startup in head.S and had an advantage that
 199           it was possible to place a software breakpoint at 'reset' and
 200           then enter your normal kernel breakpoints once the MMU was mapped
 201           to the kernel mappings (0XC0000000).
 202
 203           This unfortunately doesn't work for U-Boot and likley also wont
 204           work for using KEXEC to have a hot kernel ready for doing a
 205           KDUMP.
 206
 207           So now the MMU is initialized in head.S but it's necessary to
 208           use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
 209           xt-gdb can't place a Software Breakpoint in the  0XD region prior
 210           to mapping the MMU and after mapping even if the area of low memory
 211           was mapped gdb wouldn't remove the breakpoint on hitting it as the
 212           PC wouldn't match. Since Hardware Breakpoints are recommended for
 213           Linux configurations it seems reasonable to just assume they exist
 214           and leave this older mechanism for unfortunate souls that choose
 215           not to follow Tensilica's recommendation.
 216
 217           Selecting this will cause U-Boot to set the KERNEL Load and Entry
 218           address at 0x00003000 instead of the mapped std of 0xD0003000.
 219
 220           If in doubt, say Y.
 221
 222 config HIGHMEM
 223         bool "High Memory Support"
 224         depends on MMU
 225         help
 226           Linux can use the full amount of RAM in the system by
 227           default. However, the default MMUv2 setup only maps the
 228           lowermost 128 MB of memory linearly to the areas starting
 229           at 0xd0000000 (cached) and 0xd8000000 (uncached).
 230           When there are more than 128 MB memory in the system not
 231           all of it can be "permanently mapped" by the kernel.
 232           The physical memory that's not permanently mapped is called
 233           "high memory".
 234
 235           If you are compiling a kernel which will never run on a
 236           machine with more than 128 MB total physical RAM, answer
 237           N here.
 238
 239           If unsure, say Y.
 240
 241 config FAST_SYSCALL_XTENSA
 242         bool "Enable fast atomic syscalls"
 243         default n
 244         help
 245           fast_syscall_xtensa is a syscall that can make atomic operations
 246           on UP kernel when processor has no s32c1i support.
 247
 248           This syscall is deprecated. It may have issues when called with
 249           invalid arguments. It is provided only for backwards compatibility.
 250           Only enable it if your userspace software requires it.
 251
 252           If unsure, say N.
 253
 254 config FAST_SYSCALL_SPILL_REGISTERS
 255         bool "Enable spill registers syscall"
 256         default n
 257         help
 258           fast_syscall_spill_registers is a syscall that spills all active
 259           register windows of a calling userspace task onto its stack.
 260
 261           This syscall is deprecated. It may have issues when called with
 262           invalid arguments. It is provided only for backwards compatibility.
 263           Only enable it if your userspace software requires it.
 264
 265           If unsure, say N.
 266
 267 endmenu
 268
 269 config XTENSA_CALIBRATE_CCOUNT
 270         def_bool n
 271         help
 272           On some platforms (XT2000, for example), the CPU clock rate can
 273           vary.  The frequency can be determined, however, by measuring
 274           against a well known, fixed frequency, such as an UART oscillator.
 275
 276 config SERIAL_CONSOLE
 277         def_bool n
 278
 279 menu "Bus options"
 280
 281 config PCI
 282         bool "PCI support"
 283         default y
 284         help
 285           Find out whether you have a PCI motherboard. PCI is the name of a
 286           bus system, i.e. the way the CPU talks to the other stuff inside
 287           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 288           VESA. If you have PCI, say Y, otherwise N.
 289
 290 source "drivers/pci/Kconfig"
 291
 292 endmenu
 293
 294 menu "Platform options"
 295
 296 choice
 297         prompt "Xtensa System Type"
 298         default XTENSA_PLATFORM_ISS
 299
 300 config XTENSA_PLATFORM_ISS
 301         bool "ISS"
 302         select XTENSA_CALIBRATE_CCOUNT
 303         select SERIAL_CONSOLE
 304         help
 305           ISS is an acronym for Tensilica's Instruction Set Simulator.
 306
 307 config XTENSA_PLATFORM_XT2000
 308         bool "XT2000"
 309         select HAVE_IDE
 310         help
 311           XT2000 is the name of Tensilica's feature-rich emulation platform.
 312           This hardware is capable of running a full Linux distribution.
 313
 314 config XTENSA_PLATFORM_S6105
 315         bool "S6105"
 316         select HAVE_IDE
 317         select SERIAL_CONSOLE
 318         select NO_IOPORT_MAP
 319
 320 config XTENSA_PLATFORM_XTFPGA
 321         bool "XTFPGA"
 322         select SERIAL_CONSOLE
 323         select ETHOC
 324         select XTENSA_CALIBRATE_CCOUNT
 325         help
 326           XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
 327           This hardware is capable of running a full Linux distribution.
 328
 329 endchoice
 330
 331
 332 config XTENSA_CPU_CLOCK
 333         int "CPU clock rate [MHz]"
 334         depends on !XTENSA_CALIBRATE_CCOUNT
 335         default 16
 336
 337 config GENERIC_CALIBRATE_DELAY
 338         bool "Auto calibration of the BogoMIPS value"
 339         help
 340           The BogoMIPS value can easily be derived from the CPU frequency.
 341
 342 config CMDLINE_BOOL
 343         bool "Default bootloader kernel arguments"
 344
 345 config CMDLINE
 346         string "Initial kernel command string"
 347         depends on CMDLINE_BOOL
 348         default "console=ttyS0,38400 root=/dev/ram"
 349         help
 350           On some architectures (EBSA110 and CATS), there is currently no way
 351           for the boot loader to pass arguments to the kernel. For these
 352           architectures, you should supply some command-line options at build
 353           time by entering them here. As a minimum, you should specify the
 354           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 355
 356 config USE_OF
 357         bool "Flattened Device Tree support"
 358         select OF
 359         select OF_EARLY_FLATTREE
 360         help
 361           Include support for flattened device tree machine descriptions.
 362
 363 config BUILTIN_DTB
 364         string "DTB to build into the kernel image"
 365         depends on OF
 366
 367 config BLK_DEV_SIMDISK
 368         tristate "Host file-based simulated block device support"
 369         default n
 370         depends on XTENSA_PLATFORM_ISS
 371         help
 372           Create block devices that map to files in the host file system.
 373           Device binding to host file may be changed at runtime via proc
 374           interface provided the device is not in use.
 375
 376 config BLK_DEV_SIMDISK_COUNT
 377         int "Number of host file-based simulated block devices"
 378         range 1 10
 379         depends on BLK_DEV_SIMDISK
 380         default 2
 381         help
 382           This is the default minimal number of created block devices.
 383           Kernel/module parameter 'simdisk_count' may be used to change this
 384           value at runtime. More file names (but no more than 10) may be
 385           specified as parameters, simdisk_count grows accordingly.
 386
 387 config SIMDISK0_FILENAME
 388         string "Host filename for the first simulated device"
 389         depends on BLK_DEV_SIMDISK = y
 390         default ""
 391         help
 392           Attach a first simdisk to a host file. Conventionally, this file
 393           contains a root file system.
 394
 395 config SIMDISK1_FILENAME
 396         string "Host filename for the second simulated device"
 397         depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
 398         default ""
 399         help
 400           Another simulated disk in a host file for a buildroot-independent
 401           storage.
 402
 403 source "mm/Kconfig"
 404
 405 source "drivers/pcmcia/Kconfig"
 406
 407 source "drivers/pci/hotplug/Kconfig"
 408
 409 endmenu
 410
 411 menu "Executable file formats"
 412
 413 source "fs/Kconfig.binfmt"
 414
 415 endmenu
 416
 417 source "net/Kconfig"
 418
 419 source "drivers/Kconfig"
 420
 421 source "fs/Kconfig"
 422
 423 source "arch/xtensa/Kconfig.debug"
 424
 425 source "security/Kconfig"
 426
 427 source "crypto/Kconfig"
 428
 429 source "lib/Kconfig"
 430
 431