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