linux/arch/xtensa/Kconfig
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   1config ZONE_DMA
   2        def_bool y
   3
   4config 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
  31config RWSEM_XCHGADD_ALGORITHM
  32        def_bool y
  33
  34config GENERIC_HWEIGHT
  35        def_bool y
  36
  37config ARCH_HAS_ILOG2_U32
  38        def_bool n
  39
  40config ARCH_HAS_ILOG2_U64
  41        def_bool n
  42
  43config NO_IOPORT
  44        def_bool n
  45
  46config HZ
  47        int
  48        default 100
  49
  50source "init/Kconfig"
  51source "kernel/Kconfig.freezer"
  52
  53config LOCKDEP_SUPPORT
  54        def_bool y
  55
  56config STACKTRACE_SUPPORT
  57        def_bool y
  58
  59config TRACE_IRQFLAGS_SUPPORT
  60        def_bool y
  61
  62config MMU
  63        def_bool n
  64
  65config VARIANT_IRQ_SWITCH
  66        def_bool n
  67
  68menu "Processor type and features"
  69
  70choice
  71        prompt "Xtensa Processor Configuration"
  72        default XTENSA_VARIANT_FSF
  73
  74config XTENSA_VARIANT_FSF
  75        bool "fsf - default (not generic) configuration"
  76        select MMU
  77
  78config 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
  84config 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
  90config 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
  95endchoice
  96
  97config 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
 106source "kernel/Kconfig.preempt"
 107
 108config MATH_EMULATION
 109        bool "Math emulation"
 110        help
 111        Can we use information of configuration file?
 112
 113config 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
 142endmenu
 143
 144config 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
 151config SERIAL_CONSOLE
 152        def_bool n
 153
 154config XTENSA_ISS_NETWORK
 155        def_bool n
 156
 157menu "Bus options"
 158
 159config 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
 168source "drivers/pci/Kconfig"
 169
 170endmenu
 171
 172menu "Platform options"
 173
 174choice
 175        prompt "Xtensa System Type"
 176        default XTENSA_PLATFORM_ISS
 177
 178config 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
 187config 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
 193config XTENSA_PLATFORM_S6105
 194        bool "S6105"
 195        select SERIAL_CONSOLE
 196        select NO_IOPORT
 197
 198config 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
 207endchoice
 208
 209
 210config XTENSA_CPU_CLOCK
 211        int "CPU clock rate [MHz]"
 212        depends on !XTENSA_CALIBRATE_CCOUNT
 213        default 16
 214
 215config 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
 220config CMDLINE_BOOL
 221        bool "Default bootloader kernel arguments"
 222
 223config 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
 234config 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
 241config BUILTIN_DTB
 242        string "DTB to build into the kernel image"
 243        depends on OF
 244
 245config 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
 254config 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
 265config 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
 273config 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
 281source "mm/Kconfig"
 282
 283source "drivers/pcmcia/Kconfig"
 284
 285source "drivers/pci/hotplug/Kconfig"
 286
 287endmenu
 288
 289menu "Executable file formats"
 290
 291source "fs/Kconfig.binfmt"
 292
 293endmenu
 294
 295source "net/Kconfig"
 296
 297source "drivers/Kconfig"
 298
 299source "fs/Kconfig"
 300
 301source "arch/xtensa/Kconfig.debug"
 302
 303source "security/Kconfig"
 304
 305source "crypto/Kconfig"
 306
 307source "lib/Kconfig"
 308
 309
 310
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