arch/xtensa/Kconfig

   1 # For a description of the syntax of this configuration file,
   2 # see Documentation/kbuild/kconfig-language.txt.
   3
   4 mainmenu "Linux/Xtensa Kernel Configuration"
   5
   6 config FRAME_POINTER
   7         def_bool n
   8
   9 config ZONE_DMA
  10         def_bool y
  11
  12 config XTENSA
  13         def_bool y
  14         select HAVE_IDE
  15         help
  16           Xtensa processors are 32-bit RISC machines designed by Tensilica
  17           primarily for embedded systems.  These processors are both
  18           configurable and extensible.  The Linux port to the Xtensa
  19           architecture supports all processor configurations and extensions,
  20           with reasonable minimum requirements.  The Xtensa Linux project has
  21           a home page at <http://xtensa.sourceforge.net/>.
  22
  23 config RWSEM_XCHGADD_ALGORITHM
  24         def_bool y
  25
  26 config GENERIC_FIND_NEXT_BIT
  27         def_bool y
  28
  29 config GENERIC_HWEIGHT
  30         def_bool y
  31
  32 config GENERIC_HARDIRQS
  33         def_bool y
  34
  35 config GENERIC_GPIO
  36         def_bool y
  37
  38 config ARCH_HAS_ILOG2_U32
  39         def_bool n
  40
  41 config ARCH_HAS_ILOG2_U64
  42         def_bool n
  43
  44 config NO_IOPORT
  45         def_bool y
  46
  47 config HZ
  48         int
  49         default 100
  50
  51 config GENERIC_TIME
  52         def_bool y
  53
  54 source "init/Kconfig"
  55 source "kernel/Kconfig.freezer"
  56
  57 config MMU
  58         def_bool n
  59
  60 config VARIANT_IRQ_SWITCH
  61         def_bool n
  62
  63 menu "Processor type and features"
  64
  65 choice
  66         prompt "Xtensa Processor Configuration"
  67         default XTENSA_VARIANT_FSF
  68
  69 config XTENSA_VARIANT_FSF
  70         bool "fsf - default (not generic) configuration"
  71         select MMU
  72
  73 config XTENSA_VARIANT_DC232B
  74         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  75         select MMU
  76         help
  77           This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  78
  79 config XTENSA_VARIANT_S6000
  80         bool "s6000 - Stretch software configurable processor"
  81         select VARIANT_IRQ_SWITCH
  82         select ARCH_REQUIRE_GPIOLIB
  83         select XTENSA_CALIBRATE_CCOUNT
  84 endchoice
  85
  86 config XTENSA_UNALIGNED_USER
  87         bool "Unaligned memory access in use space"
  88         help
  89           The Xtensa architecture currently does not handle unaligned
  90           memory accesses in hardware but through an exception handler.
  91           Per default, unaligned memory accesses are disabled in user space.
  92
  93           Say Y here to enable unaligned memory access in user space.
  94
  95 config PREEMPT
  96         bool "Preemptible Kernel"
  97         help
  98           This option reduces the latency of the kernel when reacting to
  99           real-time or interactive events by allowing a low priority process to
 100           be preempted even if it is in kernel mode executing a system call.
 101           Unfortunately the kernel code has some race conditions if both
 102           CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
 103           currently disabled if you are building an SMP kernel.
 104
 105           Say Y here if you are building a kernel for a desktop, embedded
 106           or real-time system.  Say N if you are unsure.
 107
 108 config MATH_EMULATION
 109         bool "Math emulation"
 110         help
 111         Can we use information of configuration file?
 112
 113 endmenu
 114
 115 config XTENSA_CALIBRATE_CCOUNT
 116         def_bool n
 117         help
 118           On some platforms (XT2000, for example), the CPU clock rate can
 119           vary.  The frequency can be determined, however, by measuring
 120           against a well known, fixed frequency, such as an UART oscillator.
 121
 122 config SERIAL_CONSOLE
 123         def_bool n
 124
 125 config XTENSA_ISS_NETWORK
 126         def_bool n
 127
 128 menu "Bus options"
 129
 130 config PCI
 131         bool "PCI support"
 132         default y
 133         help
 134           Find out whether you have a PCI motherboard. PCI is the name of a
 135           bus system, i.e. the way the CPU talks to the other stuff inside
 136           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 137           VESA. If you have PCI, say Y, otherwise N.
 138
 139 source "drivers/pci/Kconfig"
 140
 141 endmenu
 142
 143 menu "Platform options"
 144
 145 choice
 146         prompt "Xtensa System Type"
 147         default XTENSA_PLATFORM_ISS
 148
 149 config XTENSA_PLATFORM_ISS
 150         bool "ISS"
 151         select XTENSA_CALIBRATE_CCOUNT
 152         select SERIAL_CONSOLE
 153         select XTENSA_ISS_NETWORK
 154         help
 155           ISS is an acronym for Tensilica's Instruction Set Simulator.
 156
 157 config XTENSA_PLATFORM_XT2000
 158         bool "XT2000"
 159         help
 160           XT2000 is the name of Tensilica's feature-rich emulation platform.
 161           This hardware is capable of running a full Linux distribution.
 162
 163 config XTENSA_PLATFORM_S6105
 164         bool "S6105"
 165         select SERIAL_CONSOLE
 166
 167 endchoice
 168
 169
 170 config XTENSA_CPU_CLOCK
 171         int "CPU clock rate [MHz]"
 172         depends on !XTENSA_CALIBRATE_CCOUNT
 173         default 16
 174
 175 config GENERIC_CALIBRATE_DELAY
 176         bool "Auto calibration of the BogoMIPS value"
 177         help
 178           The BogoMIPS value can easily be derived from the CPU frequency.
 179
 180 config CMDLINE_BOOL
 181         bool "Default bootloader kernel arguments"
 182
 183 config CMDLINE
 184         string "Initial kernel command string"
 185         depends on CMDLINE_BOOL
 186         default "console=ttyS0,38400 root=/dev/ram"
 187         help
 188           On some architectures (EBSA110 and CATS), there is currently no way
 189           for the boot loader to pass arguments to the kernel. For these
 190           architectures, you should supply some command-line options at build
 191           time by entering them here. As a minimum, you should specify the
 192           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 193
 194 source "mm/Kconfig"
 195
 196 config HOTPLUG
 197         bool "Support for hot-pluggable devices"
 198         help
 199           Say Y here if you want to plug devices into your computer while
 200           the system is running, and be able to use them quickly.  In many
 201           cases, the devices can likewise be unplugged at any time too.
 202
 203           One well known example of this is PCMCIA- or PC-cards, credit-card
 204           size devices such as network cards, modems or hard drives which are
 205           plugged into slots found on all modern laptop computers.  Another
 206           example, used on modern desktops as well as laptops, is USB.
 207
 208           Enable HOTPLUG and build a modular kernel.  Get agent software
 209           (from <http://linux-hotplug.sourceforge.net/>) and install it.
 210           Then your kernel will automatically call out to a user mode "policy
 211           agent" (/sbin/hotplug) to load modules and set up software needed
 212           to use devices as you hotplug them.
 213
 214 source "drivers/pcmcia/Kconfig"
 215
 216 source "drivers/pci/hotplug/Kconfig"
 217
 218 endmenu
 219
 220 menu "Executable file formats"
 221
 222 # only elf supported
 223 config KCORE_ELF
 224         def_bool y
 225         depends on PROC_FS
 226         help
 227           If you enabled support for /proc file system then the file
 228           /proc/kcore will contain the kernel core image in ELF format. This
 229           can be used in gdb:
 230
 231           $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
 232
 233           This is especially useful if you have compiled the kernel with the
 234           "-g" option to preserve debugging information. It is mainly used
 235           for examining kernel data structures on the live kernel.
 236
 237 source "fs/Kconfig.binfmt"
 238
 239 endmenu
 240
 241 source "net/Kconfig"
 242
 243 source "drivers/Kconfig"
 244
 245 source "fs/Kconfig"
 246
 247 menu "Xtensa initrd options"
 248         depends on BLK_DEV_INITRD
 249
 250 config EMBEDDED_RAMDISK
 251         bool "Embed root filesystem ramdisk into the kernel"
 252
 253 config EMBEDDED_RAMDISK_IMAGE
 254         string "Filename of gzipped ramdisk image"
 255         depends on EMBEDDED_RAMDISK
 256         default "ramdisk.gz"
 257         help
 258           This is the filename of the ramdisk image to be built into the
 259           kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
 260           The ramdisk image is not part of the kernel distribution; you must
 261           provide one yourself.
 262 endmenu
 263
 264 source "arch/xtensa/Kconfig.debug"
 265
 266 source "security/Kconfig"
 267
 268 source "crypto/Kconfig"
 269
 270 source "lib/Kconfig"
 271
 272