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