arch/xtensa/Kconfig

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