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