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 endchoice
  84
  85 config XTENSA_UNALIGNED_USER
  86         bool "Unaligned memory access in use space"
  87         help
  88           The Xtensa architecture currently does not handle unaligned
  89           memory accesses in hardware but through an exception handler.
  90           Per default, unaligned memory accesses are disabled in user space.
  91
  92           Say Y here to enable unaligned memory access in user space.
  93
  94 config PREEMPT
  95         bool "Preemptible Kernel"
  96         help
  97           This option reduces the latency of the kernel when reacting to
  98           real-time or interactive events by allowing a low priority process to
  99           be preempted even if it is in kernel mode executing a system call.
 100           Unfortunately the kernel code has some race conditions if both
 101           CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
 102           currently disabled if you are building an SMP kernel.
 103
 104           Say Y here if you are building a kernel for a desktop, embedded
 105           or real-time system.  Say N if you are unsure.
 106
 107 config MATH_EMULATION
 108         bool "Math emulation"
 109         help
 110         Can we use information of configuration file?
 111
 112 endmenu
 113
 114 config XTENSA_CALIBRATE_CCOUNT
 115         def_bool n
 116         help
 117           On some platforms (XT2000, for example), the CPU clock rate can
 118           vary.  The frequency can be determined, however, by measuring
 119           against a well known, fixed frequency, such as an UART oscillator.
 120
 121 config SERIAL_CONSOLE
 122         def_bool n
 123
 124 config XTENSA_ISS_NETWORK
 125         def_bool n
 126
 127 menu "Bus options"
 128
 129 config PCI
 130         bool "PCI support"
 131         default y
 132         help
 133           Find out whether you have a PCI motherboard. PCI is the name of a
 134           bus system, i.e. the way the CPU talks to the other stuff inside
 135           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 136           VESA. If you have PCI, say Y, otherwise N.
 137
 138 source "drivers/pci/Kconfig"
 139
 140 menu "Platform options"
 141
 142 choice
 143         prompt "Xtensa System Type"
 144         default XTENSA_PLATFORM_ISS
 145
 146 config XTENSA_PLATFORM_ISS
 147         bool "ISS"
 148         select XTENSA_CALIBRATE_CCOUNT
 149         select SERIAL_CONSOLE
 150         select XTENSA_ISS_NETWORK
 151         help
 152           ISS is an acronym for Tensilica's Instruction Set Simulator.
 153
 154 config XTENSA_PLATFORM_XT2000
 155         bool "XT2000"
 156         select XTENSA_CALIBRATE_CCOUNT
 157         select PCI
 158         help
 159           XT2000 is the name of Tensilica's feature-rich emulation platform.
 160           This hardware is capable of running a full Linux distribution.
 161
 162 config XTENSA_PLATFORM_S6105
 163         bool "S6105"
 164         select SERIAL_CONSOLE
 165
 166 endchoice
 167
 168
 169 config XTENSA_CPU_CLOCK
 170         int "CPU clock rate [MHz]"
 171         depends on !XTENSA_CALIBRATE_CCOUNT
 172         default 16
 173
 174 config GENERIC_CALIBRATE_DELAY
 175         bool "Auto calibration of the BogoMIPS value"
 176         help
 177           The BogoMIPS value can easily be derived from the CPU frequency.
 178
 179 config CMDLINE_BOOL
 180         bool "Default bootloader kernel arguments"
 181
 182 config CMDLINE
 183         string "Initial kernel command string"
 184         depends on CMDLINE_BOOL
 185         default "console=ttyS0,38400 root=/dev/ram"
 186         help
 187           On some architectures (EBSA110 and CATS), there is currently no way
 188           for the boot loader to pass arguments to the kernel. For these
 189           architectures, you should supply some command-line options at build
 190           time by entering them here. As a minimum, you should specify the
 191           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 192
 193 source "mm/Kconfig"
 194
 195 endmenu
 196
 197 config HOTPLUG
 198         bool "Support for hot-pluggable devices"
 199         help
 200           Say Y here if you want to plug devices into your computer while
 201           the system is running, and be able to use them quickly.  In many
 202           cases, the devices can likewise be unplugged at any time too.
 203
 204           One well known example of this is PCMCIA- or PC-cards, credit-card
 205           size devices such as network cards, modems or hard drives which are
 206           plugged into slots found on all modern laptop computers.  Another
 207           example, used on modern desktops as well as laptops, is USB.
 208
 209           Enable HOTPLUG and build a modular kernel.  Get agent software
 210           (from <http://linux-hotplug.sourceforge.net/>) and install it.
 211           Then your kernel will automatically call out to a user mode "policy
 212           agent" (/sbin/hotplug) to load modules and set up software needed
 213           to use devices as you hotplug them.
 214
 215 source "drivers/pcmcia/Kconfig"
 216
 217 source "drivers/pci/hotplug/Kconfig"
 218
 219 endmenu
 220
 221 menu "Executable file formats"
 222
 223 # only elf supported
 224 config KCORE_ELF
 225         def_bool y
 226         depends on PROC_FS
 227         help
 228           If you enabled support for /proc file system then the file
 229           /proc/kcore will contain the kernel core image in ELF format. This
 230           can be used in gdb:
 231
 232           $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
 233
 234           This is especially useful if you have compiled the kernel with the
 235           "-g" option to preserve debugging information. It is mainly used
 236           for examining kernel data structures on the live kernel.
 237
 238 source "fs/Kconfig.binfmt"
 239
 240 endmenu
 241
 242 source "net/Kconfig"
 243
 244 source "drivers/Kconfig"
 245
 246 source "fs/Kconfig"
 247
 248 menu "Xtensa initrd options"
 249         depends on BLK_DEV_INITRD
 250
 251 config EMBEDDED_RAMDISK
 252         bool "Embed root filesystem ramdisk into the kernel"
 253
 254 config EMBEDDED_RAMDISK_IMAGE
 255         string "Filename of gzipped ramdisk image"
 256         depends on EMBEDDED_RAMDISK
 257         default "ramdisk.gz"
 258         help
 259           This is the filename of the ramdisk image to be built into the
 260           kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
 261           The ramdisk image is not part of the kernel distribution; you must
 262           provide one yourself.
 263 endmenu
 264
 265 source "arch/xtensa/Kconfig.debug"
 266
 267 source "security/Kconfig"
 268
 269 source "crypto/Kconfig"
 270
 271 source "lib/Kconfig"
 272
 273