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 HAVE_GENERIC_HARDIRQS
  11         select VIRT_TO_BUS
  12         select GENERIC_IRQ_SHOW
  13         select GENERIC_CPU_DEVICES
  14         select GENERIC_SCHED_CLOCK
  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         select HAVE_FUNCTION_TRACER
  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 menu "Processor type and features"
  69
  70 choice
  71         prompt "Xtensa Processor Configuration"
  72         default XTENSA_VARIANT_FSF
  73
  74 config XTENSA_VARIANT_FSF
  75         bool "fsf - default (not generic) configuration"
  76         select MMU
  77
  78 config XTENSA_VARIANT_DC232B
  79         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  80         select MMU
  81         help
  82           This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  83
  84 config XTENSA_VARIANT_DC233C
  85         bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
  86         select MMU
  87         help
  88           This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
  89
  90 config XTENSA_VARIANT_S6000
  91         bool "s6000 - Stretch software configurable processor"
  92         select VARIANT_IRQ_SWITCH
  93         select ARCH_REQUIRE_GPIOLIB
  94         select XTENSA_CALIBRATE_CCOUNT
  95 endchoice
  96
  97 config XTENSA_UNALIGNED_USER
  98         bool "Unaligned memory access in use space"
  99         help
 100           The Xtensa architecture currently does not handle unaligned
 101           memory accesses in hardware but through an exception handler.
 102           Per default, unaligned memory accesses are disabled in user space.
 103
 104           Say Y here to enable unaligned memory access in user space.
 105
 106 source "kernel/Kconfig.preempt"
 107
 108 config MATH_EMULATION
 109         bool "Math emulation"
 110         help
 111         Can we use information of configuration file?
 112
 113 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 114         bool "Initialize Xtensa MMU inside the Linux kernel code"
 115         default y
 116         help
 117           Earlier version initialized the MMU in the exception vector
 118           before jumping to _startup in head.S and had an advantage that
 119           it was possible to place a software breakpoint at 'reset' and
 120           then enter your normal kernel breakpoints once the MMU was mapped
 121           to the kernel mappings (0XC0000000).
 122
 123           This unfortunately doesn't work for U-Boot and likley also wont
 124           work for using KEXEC to have a hot kernel ready for doing a
 125           KDUMP.
 126
 127           So now the MMU is initialized in head.S but it's necessary to
 128           use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
 129           xt-gdb can't place a Software Breakpoint in the  0XD region prior
 130           to mapping the MMU and after mapping even if the area of low memory
 131           was mapped gdb wouldn't remove the breakpoint on hitting it as the
 132           PC wouldn't match. Since Hardware Breakpoints are recommended for
 133           Linux configurations it seems reasonable to just assume they exist
 134           and leave this older mechanism for unfortunate souls that choose
 135           not to follow Tensilica's recommendation.
 136
 137           Selecting this will cause U-Boot to set the KERNEL Load and Entry
 138           address at 0x00003000 instead of the mapped std of 0xD0003000.
 139
 140           If in doubt, say Y.
 141
 142 endmenu
 143
 144 config XTENSA_CALIBRATE_CCOUNT
 145         def_bool n
 146         help
 147           On some platforms (XT2000, for example), the CPU clock rate can
 148           vary.  The frequency can be determined, however, by measuring
 149           against a well known, fixed frequency, such as an UART oscillator.
 150
 151 config SERIAL_CONSOLE
 152         def_bool n
 153
 154 config XTENSA_ISS_NETWORK
 155         def_bool n
 156
 157 menu "Bus options"
 158
 159 config PCI
 160         bool "PCI support"
 161         default y
 162         help
 163           Find out whether you have a PCI motherboard. PCI is the name of a
 164           bus system, i.e. the way the CPU talks to the other stuff inside
 165           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 166           VESA. If you have PCI, say Y, otherwise N.
 167
 168 source "drivers/pci/Kconfig"
 169
 170 endmenu
 171
 172 menu "Platform options"
 173
 174 choice
 175         prompt "Xtensa System Type"
 176         default XTENSA_PLATFORM_ISS
 177
 178 config XTENSA_PLATFORM_ISS
 179         bool "ISS"
 180         depends on TTY
 181         select XTENSA_CALIBRATE_CCOUNT
 182         select SERIAL_CONSOLE
 183         select XTENSA_ISS_NETWORK
 184         help
 185           ISS is an acronym for Tensilica's Instruction Set Simulator.
 186
 187 config XTENSA_PLATFORM_XT2000
 188         bool "XT2000"
 189         help
 190           XT2000 is the name of Tensilica's feature-rich emulation platform.
 191           This hardware is capable of running a full Linux distribution.
 192
 193 config XTENSA_PLATFORM_S6105
 194         bool "S6105"
 195         select SERIAL_CONSOLE
 196         select NO_IOPORT
 197
 198 config XTENSA_PLATFORM_XTFPGA
 199         bool "XTFPGA"
 200         select SERIAL_CONSOLE
 201         select ETHOC
 202         select XTENSA_CALIBRATE_CCOUNT
 203         help
 204           XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
 205           This hardware is capable of running a full Linux distribution.
 206
 207 endchoice
 208
 209
 210 config XTENSA_CPU_CLOCK
 211         int "CPU clock rate [MHz]"
 212         depends on !XTENSA_CALIBRATE_CCOUNT
 213         default 16
 214
 215 config GENERIC_CALIBRATE_DELAY
 216         bool "Auto calibration of the BogoMIPS value"
 217         help
 218           The BogoMIPS value can easily be derived from the CPU frequency.
 219
 220 config CMDLINE_BOOL
 221         bool "Default bootloader kernel arguments"
 222
 223 config CMDLINE
 224         string "Initial kernel command string"
 225         depends on CMDLINE_BOOL
 226         default "console=ttyS0,38400 root=/dev/ram"
 227         help
 228           On some architectures (EBSA110 and CATS), there is currently no way
 229           for the boot loader to pass arguments to the kernel. For these
 230           architectures, you should supply some command-line options at build
 231           time by entering them here. As a minimum, you should specify the
 232           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 233
 234 config USE_OF
 235         bool "Flattened Device Tree support"
 236         select OF
 237         select OF_EARLY_FLATTREE
 238         help
 239           Include support for flattened device tree machine descriptions.
 240
 241 config BUILTIN_DTB
 242         string "DTB to build into the kernel image"
 243         depends on OF
 244
 245 config BLK_DEV_SIMDISK
 246         tristate "Host file-based simulated block device support"
 247         default n
 248         depends on XTENSA_PLATFORM_ISS
 249         help
 250           Create block devices that map to files in the host file system.
 251           Device binding to host file may be changed at runtime via proc
 252           interface provided the device is not in use.
 253
 254 config BLK_DEV_SIMDISK_COUNT
 255         int "Number of host file-based simulated block devices"
 256         range 1 10
 257         depends on BLK_DEV_SIMDISK
 258         default 2
 259         help
 260           This is the default minimal number of created block devices.
 261           Kernel/module parameter 'simdisk_count' may be used to change this
 262           value at runtime. More file names (but no more than 10) may be
 263           specified as parameters, simdisk_count grows accordingly.
 264
 265 config SIMDISK0_FILENAME
 266         string "Host filename for the first simulated device"
 267         depends on BLK_DEV_SIMDISK = y
 268         default ""
 269         help
 270           Attach a first simdisk to a host file. Conventionally, this file
 271           contains a root file system.
 272
 273 config SIMDISK1_FILENAME
 274         string "Host filename for the second simulated device"
 275         depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
 276         default ""
 277         help
 278           Another simulated disk in a host file for a buildroot-independent
 279           storage.
 280
 281 source "mm/Kconfig"
 282
 283 source "drivers/pcmcia/Kconfig"
 284
 285 source "drivers/pci/hotplug/Kconfig"
 286
 287 endmenu
 288
 289 menu "Executable file formats"
 290
 291 source "fs/Kconfig.binfmt"
 292
 293 endmenu
 294
 295 source "net/Kconfig"
 296
 297 source "drivers/Kconfig"
 298
 299 source "fs/Kconfig"
 300
 301 source "arch/xtensa/Kconfig.debug"
 302
 303 source "security/Kconfig"
 304
 305 source "crypto/Kconfig"
 306
 307 source "lib/Kconfig"
 308
 309