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