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