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         select COMMON_CLK
  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         def_bool n
  65
  66 config VARIANT_IRQ_SWITCH
  67         def_bool n
  68
  69 config HAVE_XTENSA_GPIO32
  70         def_bool n
  71
  72 config MAY_HAVE_SMP
  73         def_bool n
  74
  75 menu "Processor type and features"
  76
  77 choice
  78         prompt "Xtensa Processor Configuration"
  79         default XTENSA_VARIANT_FSF
  80
  81 config XTENSA_VARIANT_FSF
  82         bool "fsf - default (not generic) configuration"
  83         select MMU
  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 GENERIC_SMP_IDLE_THREAD
 139         help
 140           Enabled SMP Software; allows more than one CPU/CORE
 141           to be activated during startup.
 142
 143 config NR_CPUS
 144         depends on SMP
 145         int "Maximum number of CPUs (2-32)"
 146         range 2 32
 147         default "4"
 148
 149 config HOTPLUG_CPU
 150         bool "Enable CPU hotplug support"
 151         depends on SMP
 152         help
 153           Say Y here to allow turning CPUs off and on. CPUs can be
 154           controlled through /sys/devices/system/cpu.
 155
 156           Say N if you want to disable CPU hotplug.
 157
 158 config MATH_EMULATION
 159         bool "Math emulation"
 160         help
 161         Can we use information of configuration file?
 162
 163 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 164         bool "Initialize Xtensa MMU inside the Linux kernel code"
 165         default y
 166         help
 167           Earlier version initialized the MMU in the exception vector
 168           before jumping to _startup in head.S and had an advantage that
 169           it was possible to place a software breakpoint at 'reset' and
 170           then enter your normal kernel breakpoints once the MMU was mapped
 171           to the kernel mappings (0XC0000000).
 172
 173           This unfortunately doesn't work for U-Boot and likley also wont
 174           work for using KEXEC to have a hot kernel ready for doing a
 175           KDUMP.
 176
 177           So now the MMU is initialized in head.S but it's necessary to
 178           use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
 179           xt-gdb can't place a Software Breakpoint in the  0XD region prior
 180           to mapping the MMU and after mapping even if the area of low memory
 181           was mapped gdb wouldn't remove the breakpoint on hitting it as the
 182           PC wouldn't match. Since Hardware Breakpoints are recommended for
 183           Linux configurations it seems reasonable to just assume they exist
 184           and leave this older mechanism for unfortunate souls that choose
 185           not to follow Tensilica's recommendation.
 186
 187           Selecting this will cause U-Boot to set the KERNEL Load and Entry
 188           address at 0x00003000 instead of the mapped std of 0xD0003000.
 189
 190           If in doubt, say Y.
 191
 192 endmenu
 193
 194 config XTENSA_CALIBRATE_CCOUNT
 195         def_bool n
 196         help
 197           On some platforms (XT2000, for example), the CPU clock rate can
 198           vary.  The frequency can be determined, however, by measuring
 199           against a well known, fixed frequency, such as an UART oscillator.
 200
 201 config SERIAL_CONSOLE
 202         def_bool n
 203
 204 menu "Bus options"
 205
 206 config PCI
 207         bool "PCI support"
 208         default y
 209         help
 210           Find out whether you have a PCI motherboard. PCI is the name of a
 211           bus system, i.e. the way the CPU talks to the other stuff inside
 212           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 213           VESA. If you have PCI, say Y, otherwise N.
 214
 215 source "drivers/pci/Kconfig"
 216
 217 endmenu
 218
 219 menu "Platform options"
 220
 221 choice
 222         prompt "Xtensa System Type"
 223         default XTENSA_PLATFORM_ISS
 224
 225 config XTENSA_PLATFORM_ISS
 226         bool "ISS"
 227         depends on TTY
 228         select XTENSA_CALIBRATE_CCOUNT
 229         select SERIAL_CONSOLE
 230         help
 231           ISS is an acronym for Tensilica's Instruction Set Simulator.
 232
 233 config XTENSA_PLATFORM_XT2000
 234         bool "XT2000"
 235         help
 236           XT2000 is the name of Tensilica's feature-rich emulation platform.
 237           This hardware is capable of running a full Linux distribution.
 238
 239 config XTENSA_PLATFORM_S6105
 240         bool "S6105"
 241         select SERIAL_CONSOLE
 242         select NO_IOPORT_MAP
 243
 244 config XTENSA_PLATFORM_XTFPGA
 245         bool "XTFPGA"
 246         select SERIAL_CONSOLE
 247         select ETHOC
 248         select XTENSA_CALIBRATE_CCOUNT
 249         help
 250           XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
 251           This hardware is capable of running a full Linux distribution.
 252
 253 endchoice
 254
 255
 256 config XTENSA_CPU_CLOCK
 257         int "CPU clock rate [MHz]"
 258         depends on !XTENSA_CALIBRATE_CCOUNT
 259         default 16
 260
 261 config GENERIC_CALIBRATE_DELAY
 262         bool "Auto calibration of the BogoMIPS value"
 263         help
 264           The BogoMIPS value can easily be derived from the CPU frequency.
 265
 266 config CMDLINE_BOOL
 267         bool "Default bootloader kernel arguments"
 268
 269 config CMDLINE
 270         string "Initial kernel command string"
 271         depends on CMDLINE_BOOL
 272         default "console=ttyS0,38400 root=/dev/ram"
 273         help
 274           On some architectures (EBSA110 and CATS), there is currently no way
 275           for the boot loader to pass arguments to the kernel. For these
 276           architectures, you should supply some command-line options at build
 277           time by entering them here. As a minimum, you should specify the
 278           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 279
 280 config USE_OF
 281         bool "Flattened Device Tree support"
 282         select OF
 283         select OF_EARLY_FLATTREE
 284         help
 285           Include support for flattened device tree machine descriptions.
 286
 287 config BUILTIN_DTB
 288         string "DTB to build into the kernel image"
 289         depends on OF
 290
 291 config BLK_DEV_SIMDISK
 292         tristate "Host file-based simulated block device support"
 293         default n
 294         depends on XTENSA_PLATFORM_ISS
 295         help
 296           Create block devices that map to files in the host file system.
 297           Device binding to host file may be changed at runtime via proc
 298           interface provided the device is not in use.
 299
 300 config BLK_DEV_SIMDISK_COUNT
 301         int "Number of host file-based simulated block devices"
 302         range 1 10
 303         depends on BLK_DEV_SIMDISK
 304         default 2
 305         help
 306           This is the default minimal number of created block devices.
 307           Kernel/module parameter 'simdisk_count' may be used to change this
 308           value at runtime. More file names (but no more than 10) may be
 309           specified as parameters, simdisk_count grows accordingly.
 310
 311 config SIMDISK0_FILENAME
 312         string "Host filename for the first simulated device"
 313         depends on BLK_DEV_SIMDISK = y
 314         default ""
 315         help
 316           Attach a first simdisk to a host file. Conventionally, this file
 317           contains a root file system.
 318
 319 config SIMDISK1_FILENAME
 320         string "Host filename for the second simulated device"
 321         depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
 322         default ""
 323         help
 324           Another simulated disk in a host file for a buildroot-independent
 325           storage.
 326
 327 source "mm/Kconfig"
 328
 329 source "drivers/pcmcia/Kconfig"
 330
 331 source "drivers/pci/hotplug/Kconfig"
 332
 333 endmenu
 334
 335 menu "Executable file formats"
 336
 337 source "fs/Kconfig.binfmt"
 338
 339 endmenu
 340
 341 source "net/Kconfig"
 342
 343 source "drivers/Kconfig"
 344
 345 source "fs/Kconfig"
 346
 347 source "arch/xtensa/Kconfig.debug"
 348
 349 source "security/Kconfig"
 350
 351 source "crypto/Kconfig"
 352
 353 source "lib/Kconfig"
 354
 355