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         help
  11           Xtensa processors are 32-bit RISC machines designed by Tensilica
  12           primarily for embedded systems.  These processors are both
  13           configurable and extensible.  The Linux port to the Xtensa
  14           architecture supports all processor configurations and extensions,
  15           with reasonable minimum requirements.  The Xtensa Linux project has
  16           a home page at <http://xtensa.sourceforge.net/>.
  17
  18 config RWSEM_XCHGADD_ALGORITHM
  19         def_bool y
  20
  21 config GENERIC_FIND_NEXT_BIT
  22         def_bool y
  23
  24 config GENERIC_HWEIGHT
  25         def_bool y
  26
  27 config GENERIC_HARDIRQS
  28         def_bool y
  29
  30 config GENERIC_GPIO
  31         def_bool y
  32
  33 config ARCH_HAS_ILOG2_U32
  34         def_bool n
  35
  36 config ARCH_HAS_ILOG2_U64
  37         def_bool n
  38
  39 config NO_IOPORT
  40         def_bool y
  41
  42 config HZ
  43         int
  44         default 100
  45
  46 source "init/Kconfig"
  47 source "kernel/Kconfig.freezer"
  48
  49 config MMU
  50         def_bool n
  51
  52 config VARIANT_IRQ_SWITCH
  53         def_bool n
  54
  55 menu "Processor type and features"
  56
  57 choice
  58         prompt "Xtensa Processor Configuration"
  59         default XTENSA_VARIANT_FSF
  60
  61 config XTENSA_VARIANT_FSF
  62         bool "fsf - default (not generic) configuration"
  63         select MMU
  64
  65 config XTENSA_VARIANT_DC232B
  66         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  67         select MMU
  68         help
  69           This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  70
  71 config XTENSA_VARIANT_S6000
  72         bool "s6000 - Stretch software configurable processor"
  73         select VARIANT_IRQ_SWITCH
  74         select ARCH_REQUIRE_GPIOLIB
  75         select XTENSA_CALIBRATE_CCOUNT
  76 endchoice
  77
  78 config XTENSA_UNALIGNED_USER
  79         bool "Unaligned memory access in use space"
  80         help
  81           The Xtensa architecture currently does not handle unaligned
  82           memory accesses in hardware but through an exception handler.
  83           Per default, unaligned memory accesses are disabled in user space.
  84
  85           Say Y here to enable unaligned memory access in user space.
  86
  87 config PREEMPT
  88         bool "Preemptible Kernel"
  89         help
  90           This option reduces the latency of the kernel when reacting to
  91           real-time or interactive events by allowing a low priority process to
  92           be preempted even if it is in kernel mode executing a system call.
  93           Unfortunately the kernel code has some race conditions if both
  94           CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
  95           currently disabled if you are building an SMP kernel.
  96
  97           Say Y here if you are building a kernel for a desktop, embedded
  98           or real-time system.  Say N if you are unsure.
  99
 100 config MATH_EMULATION
 101         bool "Math emulation"
 102         help
 103         Can we use information of configuration file?
 104
 105 endmenu
 106
 107 config XTENSA_CALIBRATE_CCOUNT
 108         def_bool n
 109         help
 110           On some platforms (XT2000, for example), the CPU clock rate can
 111           vary.  The frequency can be determined, however, by measuring
 112           against a well known, fixed frequency, such as an UART oscillator.
 113
 114 config SERIAL_CONSOLE
 115         def_bool n
 116
 117 config XTENSA_ISS_NETWORK
 118         def_bool n
 119
 120 menu "Bus options"
 121
 122 config PCI
 123         bool "PCI support"
 124         default y
 125         help
 126           Find out whether you have a PCI motherboard. PCI is the name of a
 127           bus system, i.e. the way the CPU talks to the other stuff inside
 128           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 129           VESA. If you have PCI, say Y, otherwise N.
 130
 131 source "drivers/pci/Kconfig"
 132
 133 endmenu
 134
 135 menu "Platform options"
 136
 137 choice
 138         prompt "Xtensa System Type"
 139         default XTENSA_PLATFORM_ISS
 140
 141 config XTENSA_PLATFORM_ISS
 142         bool "ISS"
 143         select XTENSA_CALIBRATE_CCOUNT
 144         select SERIAL_CONSOLE
 145         select XTENSA_ISS_NETWORK
 146         help
 147           ISS is an acronym for Tensilica's Instruction Set Simulator.
 148
 149 config XTENSA_PLATFORM_XT2000
 150         bool "XT2000"
 151         help
 152           XT2000 is the name of Tensilica's feature-rich emulation platform.
 153           This hardware is capable of running a full Linux distribution.
 154
 155 config XTENSA_PLATFORM_S6105
 156         bool "S6105"
 157         select SERIAL_CONSOLE
 158
 159 endchoice
 160
 161
 162 config XTENSA_CPU_CLOCK
 163         int "CPU clock rate [MHz]"
 164         depends on !XTENSA_CALIBRATE_CCOUNT
 165         default 16
 166
 167 config GENERIC_CALIBRATE_DELAY
 168         bool "Auto calibration of the BogoMIPS value"
 169         help
 170           The BogoMIPS value can easily be derived from the CPU frequency.
 171
 172 config CMDLINE_BOOL
 173         bool "Default bootloader kernel arguments"
 174
 175 config CMDLINE
 176         string "Initial kernel command string"
 177         depends on CMDLINE_BOOL
 178         default "console=ttyS0,38400 root=/dev/ram"
 179         help
 180           On some architectures (EBSA110 and CATS), there is currently no way
 181           for the boot loader to pass arguments to the kernel. For these
 182           architectures, you should supply some command-line options at build
 183           time by entering them here. As a minimum, you should specify the
 184           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 185
 186 source "mm/Kconfig"
 187
 188 config HOTPLUG
 189         bool "Support for hot-pluggable devices"
 190         help
 191           Say Y here if you want to plug devices into your computer while
 192           the system is running, and be able to use them quickly.  In many
 193           cases, the devices can likewise be unplugged at any time too.
 194
 195           One well known example of this is PCMCIA- or PC-cards, credit-card
 196           size devices such as network cards, modems or hard drives which are
 197           plugged into slots found on all modern laptop computers.  Another
 198           example, used on modern desktops as well as laptops, is USB.
 199
 200           Enable HOTPLUG and build a modular kernel.  Get agent software
 201           (from <http://linux-hotplug.sourceforge.net/>) and install it.
 202           Then your kernel will automatically call out to a user mode "policy
 203           agent" (/sbin/hotplug) to load modules and set up software needed
 204           to use devices as you hotplug them.
 205
 206 source "drivers/pcmcia/Kconfig"
 207
 208 source "drivers/pci/hotplug/Kconfig"
 209
 210 endmenu
 211
 212 menu "Executable file formats"
 213
 214 # only elf supported
 215 config KCORE_ELF
 216         def_bool y
 217         depends on PROC_FS
 218         help
 219           If you enabled support for /proc file system then the file
 220           /proc/kcore will contain the kernel core image in ELF format. This
 221           can be used in gdb:
 222
 223           $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
 224
 225           This is especially useful if you have compiled the kernel with the
 226           "-g" option to preserve debugging information. It is mainly used
 227           for examining kernel data structures on the live kernel.
 228
 229 source "fs/Kconfig.binfmt"
 230
 231 endmenu
 232
 233 source "net/Kconfig"
 234
 235 source "drivers/Kconfig"
 236
 237 source "fs/Kconfig"
 238
 239 menu "Xtensa initrd options"
 240         depends on BLK_DEV_INITRD
 241
 242 config EMBEDDED_RAMDISK
 243         bool "Embed root filesystem ramdisk into the kernel"
 244
 245 config EMBEDDED_RAMDISK_IMAGE
 246         string "Filename of gzipped ramdisk image"
 247         depends on EMBEDDED_RAMDISK
 248         default "ramdisk.gz"
 249         help
 250           This is the filename of the ramdisk image to be built into the
 251           kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
 252           The ramdisk image is not part of the kernel distribution; you must
 253           provide one yourself.
 254 endmenu
 255
 256 source "arch/xtensa/Kconfig.debug"
 257
 258 source "security/Kconfig"
 259
 260 source "crypto/Kconfig"
 261
 262 source "lib/Kconfig"
 263
 264