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 endmenu
 107
 108 menu "Platform options"
 109
 110 choice
 111         prompt "Xtensa System Type"
 112         default XTENSA_PLATFORM_ISS
 113
 114 config XTENSA_PLATFORM_ISS
 115         bool "ISS"
 116         help
 117           ISS is an acronym for Tensilica's Instruction Set Simulator.
 118
 119 config XTENSA_PLATFORM_XT2000
 120         bool "XT2000"
 121         help
 122           XT2000 is the name of Tensilica's feature-rich emulation platform.
 123           This hardware is capable of running a full Linux distribution.
 124
 125 endchoice
 126
 127
 128 config XTENSA_CALIBRATE_CCOUNT
 129         bool "Auto calibration of the CPU clock rate"
 130         ---help---
 131           On some platforms (XT2000, for example), the CPU clock rate can
 132           vary.  The frequency can be determined, however, by measuring
 133           against a well known, fixed frequency, such as an UART oscillator.
 134
 135 config XTENSA_CPU_CLOCK
 136         int "CPU clock rate [MHz]"
 137         depends on !XTENSA_CALIBRATE_CCOUNT
 138         default "16"
 139
 140 config GENERIC_CALIBRATE_DELAY
 141         bool "Auto calibration of the BogoMIPS value"
 142         ---help---
 143           The BogoMIPS value can easily be derived from the CPU frequency.
 144
 145 config CMDLINE_BOOL
 146         bool "Default bootloader kernel arguments"
 147
 148 config CMDLINE
 149         string "Initial kernel command string"
 150         depends on CMDLINE_BOOL
 151         default "console=ttyS0,38400 root=/dev/ram"
 152         help
 153           On some architectures (EBSA110 and CATS), there is currently no way
 154           for the boot loader to pass arguments to the kernel. For these
 155           architectures, you should supply some command-line options at build
 156           time by entering them here. As a minimum, you should specify the
 157           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 158
 159 config SERIAL_CONSOLE
 160         bool
 161         depends on XTENSA_PLATFORM_ISS
 162         default y
 163
 164 config XTENSA_ISS_NETWORK
 165         bool
 166         depends on XTENSA_PLATFORM_ISS
 167         default y
 168
 169 source "mm/Kconfig"
 170
 171 endmenu
 172
 173 menu "Bus options"
 174
 175 config PCI
 176         bool "PCI support" if !XTENSA_PLATFORM_ISS
 177         depends on !XTENSA_PLATFORM_ISS
 178         default y
 179         help
 180           Find out whether you have a PCI motherboard. PCI is the name of a
 181           bus system, i.e. the way the CPU talks to the other stuff inside
 182           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 183           VESA. If you have PCI, say Y, otherwise N.
 184
 185 source "drivers/pci/Kconfig"
 186
 187 config HOTPLUG
 188
 189         bool "Support for hot-pluggable devices"
 190         ---help---
 191         Say Y here if you want to plug devices into your computer while
 192         the system is running, and be able to use them quickly.  In many
 193         cases, the devices can likewise be unplugged at any time too.
 194
 195         One well known example of this is PCMCIA- or PC-cards, credit-card
 196         size devices such as network cards, modems or hard drives which are
 197         plugged into slots found on all modern laptop computers.  Another
 198         example, used on modern desktops as well as laptops, is USB.
 199
 200         Enable HOTPLUG and build a modular kernel.  Get agent software
 201         (from <http://linux-hotplug.sourceforge.net/>) and install it.
 202         Then your kernel will automatically call out to a user mode "policy
 203         agent" (/sbin/hotplug) to load modules and set up software needed
 204         to use devices as you hotplug them.
 205
 206 source "drivers/pcmcia/Kconfig"
 207
 208 source "drivers/pci/hotplug/Kconfig"
 209
 210 endmenu
 211
 212 menu "Executable file formats"
 213
 214 # only elf supported
 215 config KCORE_ELF
 216         bool
 217         depends on PROC_FS
 218         default y
 219         help
 220           If you enabled support for /proc file system then the file
 221           /proc/kcore will contain the kernel core image in ELF format. This
 222           can be used in gdb:
 223
 224           $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
 225
 226           This is especially useful if you have compiled the kernel with the
 227           "-g" option to preserve debugging information. It is mainly used
 228           for examining kernel data structures on the live kernel.
 229
 230 source "fs/Kconfig.binfmt"
 231
 232 endmenu
 233
 234 source "net/Kconfig"
 235
 236 source "drivers/Kconfig"
 237
 238 source "fs/Kconfig"
 239
 240 menu "Xtensa initrd options"
 241         depends on BLK_DEV_INITRD
 242
 243         config EMBEDDED_RAMDISK
 244         bool "Embed root filesystem ramdisk into the kernel"
 245
 246 config EMBEDDED_RAMDISK_IMAGE
 247         string "Filename of gzipped ramdisk image"
 248         depends on EMBEDDED_RAMDISK
 249         default "ramdisk.gz"
 250         help
 251           This is the filename of the ramdisk image to be built into the
 252           kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
 253           The ramdisk image is not part of the kernel distribution; you must
 254           provide one yourself.
 255 endmenu
 256
 257 source "arch/xtensa/Kconfig.debug"
 258
 259 source "security/Kconfig"
 260
 261 source "crypto/Kconfig"
 262
 263 source "lib/Kconfig"
 264
 265