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