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 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
  31 config RWSEM_XCHGADD_ALGORITHM
  32         def_bool y
  33
  34 config GENERIC_HWEIGHT
  35         def_bool y
  36
  37 config ARCH_HAS_ILOG2_U32
  38         def_bool n
  39
  40 config ARCH_HAS_ILOG2_U64
  41         def_bool n
  42
  43 config NO_IOPORT
  44         def_bool n
  45
  46 config HZ
  47         int
  48         default 100
  49
  50 source "init/Kconfig"
  51 source "kernel/Kconfig.freezer"
  52
  53 config LOCKDEP_SUPPORT
  54         def_bool y
  55
  56 config STACKTRACE_SUPPORT
  57         def_bool y
  58
  59 config TRACE_IRQFLAGS_SUPPORT
  60         def_bool y
  61
  62 config MMU
  63         def_bool n
  64
  65 config VARIANT_IRQ_SWITCH
  66         def_bool n
  67
  68 config HAVE_XTENSA_GPIO32
  69         def_bool n
  70
  71 config MAY_HAVE_SMP
  72         def_bool n
  73
  74 menu "Processor type and features"
  75
  76 choice
  77         prompt "Xtensa Processor Configuration"
  78         default XTENSA_VARIANT_FSF
  79
  80 config XTENSA_VARIANT_FSF
  81         bool "fsf - default (not generic) configuration"
  82         select MMU
  83         select HAVE_XTENSA_GPIO32
  84
  85 config 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
  92 config 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
  99 config 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
 104 endchoice
 105
 106 config 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
 115 source "kernel/Kconfig.preempt"
 116
 117 config 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
 135 config 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
 144 config NR_CPUS
 145         depends on SMP
 146         int "Maximum number of CPUs (2-32)"
 147         range 2 32
 148         default "4"
 149
 150 config 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
 159 config MATH_EMULATION
 160         bool "Math emulation"
 161         help
 162         Can we use information of configuration file?
 163
 164 config 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
 193 endmenu
 194
 195 config 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
 202 config SERIAL_CONSOLE
 203         def_bool n
 204
 205 menu "Bus options"
 206
 207 config 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
 216 source "drivers/pci/Kconfig"
 217
 218 endmenu
 219
 220 menu "Platform options"
 221
 222 choice
 223         prompt "Xtensa System Type"
 224         default XTENSA_PLATFORM_ISS
 225
 226 config 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
 234 config 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
 240 config XTENSA_PLATFORM_S6105
 241         bool "S6105"
 242         select SERIAL_CONSOLE
 243         select NO_IOPORT
 244
 245 config 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
 254 endchoice
 255
 256
 257 config XTENSA_CPU_CLOCK
 258         int "CPU clock rate [MHz]"
 259         depends on !XTENSA_CALIBRATE_CCOUNT
 260         default 16
 261
 262 config 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
 267 config CMDLINE_BOOL
 268         bool "Default bootloader kernel arguments"
 269
 270 config 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
 281 config 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
 288 config BUILTIN_DTB
 289         string "DTB to build into the kernel image"
 290         depends on OF
 291
 292 config 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
 301 config 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
 312 config 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
 320 config 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
 328 source "mm/Kconfig"
 329
 330 source "drivers/pcmcia/Kconfig"
 331
 332 source "drivers/pci/hotplug/Kconfig"
 333
 334 endmenu
 335
 336 menu "Executable file formats"
 337
 338 source "fs/Kconfig.binfmt"
 339
 340 endmenu
 341
 342 source "net/Kconfig"
 343
 344 source "drivers/Kconfig"
 345
 346 source "fs/Kconfig"
 347
 348 source "arch/xtensa/Kconfig.debug"
 349
 350 source "security/Kconfig"
 351
 352 source "crypto/Kconfig"
 353
 354 source "lib/Kconfig"
 355
 356