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