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 config GENERIC_TIME
  47         def_bool y
  48
  49 source "init/Kconfig"
  50 source "kernel/Kconfig.freezer"
  51
  52 config MMU
  53         def_bool n
  54
  55 config VARIANT_IRQ_SWITCH
  56         def_bool n
  57
  58 menu "Processor type and features"
  59
  60 choice
  61         prompt "Xtensa Processor Configuration"
  62         default XTENSA_VARIANT_FSF
  63
  64 config XTENSA_VARIANT_FSF
  65         bool "fsf - default (not generic) configuration"
  66         select MMU
  67
  68 config XTENSA_VARIANT_DC232B
  69         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  70         select MMU
  71         help
  72           This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  73
  74 config XTENSA_VARIANT_S6000
  75         bool "s6000 - Stretch software configurable processor"
  76         select VARIANT_IRQ_SWITCH
  77         select ARCH_REQUIRE_GPIOLIB
  78         select XTENSA_CALIBRATE_CCOUNT
  79 endchoice
  80
  81 config XTENSA_UNALIGNED_USER
  82         bool "Unaligned memory access in use space"
  83         help
  84           The Xtensa architecture currently does not handle unaligned
  85           memory accesses in hardware but through an exception handler.
  86           Per default, unaligned memory accesses are disabled in user space.
  87
  88           Say Y here to enable unaligned memory access in user space.
  89
  90 config PREEMPT
  91         bool "Preemptible Kernel"
  92         help
  93           This option reduces the latency of the kernel when reacting to
  94           real-time or interactive events by allowing a low priority process to
  95           be preempted even if it is in kernel mode executing a system call.
  96           Unfortunately the kernel code has some race conditions if both
  97           CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
  98           currently disabled if you are building an SMP kernel.
  99
 100           Say Y here if you are building a kernel for a desktop, embedded
 101           or real-time system.  Say N if you are unsure.
 102
 103 config MATH_EMULATION
 104         bool "Math emulation"
 105         help
 106         Can we use information of configuration file?
 107
 108 endmenu
 109
 110 config XTENSA_CALIBRATE_CCOUNT
 111         def_bool n
 112         help
 113           On some platforms (XT2000, for example), the CPU clock rate can
 114           vary.  The frequency can be determined, however, by measuring
 115           against a well known, fixed frequency, such as an UART oscillator.
 116
 117 config SERIAL_CONSOLE
 118         def_bool n
 119
 120 config XTENSA_ISS_NETWORK
 121         def_bool n
 122
 123 menu "Bus options"
 124
 125 config PCI
 126         bool "PCI support"
 127         default y
 128         help
 129           Find out whether you have a PCI motherboard. PCI is the name of a
 130           bus system, i.e. the way the CPU talks to the other stuff inside
 131           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 132           VESA. If you have PCI, say Y, otherwise N.
 133
 134 source "drivers/pci/Kconfig"
 135
 136 endmenu
 137
 138 menu "Platform options"
 139
 140 choice
 141         prompt "Xtensa System Type"
 142         default XTENSA_PLATFORM_ISS
 143
 144 config XTENSA_PLATFORM_ISS
 145         bool "ISS"
 146         select XTENSA_CALIBRATE_CCOUNT
 147         select SERIAL_CONSOLE
 148         select XTENSA_ISS_NETWORK
 149         help
 150           ISS is an acronym for Tensilica's Instruction Set Simulator.
 151
 152 config XTENSA_PLATFORM_XT2000
 153         bool "XT2000"
 154         help
 155           XT2000 is the name of Tensilica's feature-rich emulation platform.
 156           This hardware is capable of running a full Linux distribution.
 157
 158 config XTENSA_PLATFORM_S6105
 159         bool "S6105"
 160         select SERIAL_CONSOLE
 161
 162 endchoice
 163
 164
 165 config XTENSA_CPU_CLOCK
 166         int "CPU clock rate [MHz]"
 167         depends on !XTENSA_CALIBRATE_CCOUNT
 168         default 16
 169
 170 config GENERIC_CALIBRATE_DELAY
 171         bool "Auto calibration of the BogoMIPS value"
 172         help
 173           The BogoMIPS value can easily be derived from the CPU frequency.
 174
 175 config CMDLINE_BOOL
 176         bool "Default bootloader kernel arguments"
 177
 178 config CMDLINE
 179         string "Initial kernel command string"
 180         depends on CMDLINE_BOOL
 181         default "console=ttyS0,38400 root=/dev/ram"
 182         help
 183           On some architectures (EBSA110 and CATS), there is currently no way
 184           for the boot loader to pass arguments to the kernel. For these
 185           architectures, you should supply some command-line options at build
 186           time by entering them here. As a minimum, you should specify the
 187           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 188
 189 source "mm/Kconfig"
 190
 191 config HOTPLUG
 192         bool "Support for hot-pluggable devices"
 193         help
 194           Say Y here if you want to plug devices into your computer while
 195           the system is running, and be able to use them quickly.  In many
 196           cases, the devices can likewise be unplugged at any time too.
 197
 198           One well known example of this is PCMCIA- or PC-cards, credit-card
 199           size devices such as network cards, modems or hard drives which are
 200           plugged into slots found on all modern laptop computers.  Another
 201           example, used on modern desktops as well as laptops, is USB.
 202
 203           Enable HOTPLUG and build a modular kernel.  Get agent software
 204           (from <http://linux-hotplug.sourceforge.net/>) and install it.
 205           Then your kernel will automatically call out to a user mode "policy
 206           agent" (/sbin/hotplug) to load modules and set up software needed
 207           to use devices as you hotplug them.
 208
 209 source "drivers/pcmcia/Kconfig"
 210
 211 source "drivers/pci/hotplug/Kconfig"
 212
 213 endmenu
 214
 215 menu "Executable file formats"
 216
 217 # only elf supported
 218 config KCORE_ELF
 219         def_bool y
 220         depends on PROC_FS
 221         help
 222           If you enabled support for /proc file system then the file
 223           /proc/kcore will contain the kernel core image in ELF format. This
 224           can be used in gdb:
 225
 226           $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
 227
 228           This is especially useful if you have compiled the kernel with the
 229           "-g" option to preserve debugging information. It is mainly used
 230           for examining kernel data structures on the live kernel.
 231
 232 source "fs/Kconfig.binfmt"
 233
 234 endmenu
 235
 236 source "net/Kconfig"
 237
 238 source "drivers/Kconfig"
 239
 240 source "fs/Kconfig"
 241
 242 menu "Xtensa initrd options"
 243         depends on BLK_DEV_INITRD
 244
 245 config EMBEDDED_RAMDISK
 246         bool "Embed root filesystem ramdisk into the kernel"
 247
 248 config EMBEDDED_RAMDISK_IMAGE
 249         string "Filename of gzipped ramdisk image"
 250         depends on EMBEDDED_RAMDISK
 251         default "ramdisk.gz"
 252         help
 253           This is the filename of the ramdisk image to be built into the
 254           kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
 255           The ramdisk image is not part of the kernel distribution; you must
 256           provide one yourself.
 257 endmenu
 258
 259 source "arch/xtensa/Kconfig.debug"
 260
 261 source "security/Kconfig"
 262
 263 source "crypto/Kconfig"
 264
 265 source "lib/Kconfig"
 266
 267