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