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