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 - default (not generic) configuration"
  67
  68 config XTENSA_VARIANT_DC232B
  69         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  70         help
  71         This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  72 endchoice
  73
  74 config MMU
  75         bool
  76         default y
  77
  78 config XTENSA_UNALIGNED_USER
  79         bool "Unaligned memory access in use space"
  80         ---help---
  81            The Xtensa architecture currently does not handle unaligned
  82            memory accesses in hardware but through an exception handler.
  83            Per default, unaligned memory accesses are disabled in user space.
  84
  85            Say Y here to enable unaligned memory access in user space.
  86
  87 config PREEMPT
  88         bool "Preemptible Kernel"
  89         ---help---
  90            This option reduces the latency of the kernel when reacting to
  91            real-time or interactive events by allowing a low priority process to
  92            be preempted even if it is in kernel mode executing a system call.
  93            Unfortunately the kernel code has some race conditions if both
  94            CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
  95            currently disabled if you are building an SMP kernel.
  96
  97            Say Y here if you are building a kernel for a desktop, embedded
  98            or real-time system.  Say N if you are unsure.
  99
 100 config MATH_EMULATION
 101         bool "Math emulation"
 102         help
 103         Can we use information of configuration file?
 104
 105 config HIGHMEM
 106         bool "High memory support"
 107
 108 endmenu
 109
 110 menu "Platform options"
 111
 112 choice
 113         prompt "Xtensa System Type"
 114         default XTENSA_PLATFORM_ISS
 115
 116 config XTENSA_PLATFORM_ISS
 117         bool "ISS"
 118         help
 119           ISS is an acronym for Tensilica's Instruction Set Simulator.
 120
 121 config XTENSA_PLATFORM_XT2000
 122         bool "XT2000"
 123         help
 124           XT2000 is the name of Tensilica's feature-rich emulation platform.
 125           This hardware is capable of running a full Linux distribution.
 126
 127 endchoice
 128
 129
 130 config XTENSA_CALIBRATE_CCOUNT
 131         bool "Auto calibration of the CPU clock rate"
 132         ---help---
 133           On some platforms (XT2000, for example), the CPU clock rate can
 134           vary.  The frequency can be determined, however, by measuring
 135           against a well known, fixed frequency, such as an UART oscillator.
 136
 137 config XTENSA_CPU_CLOCK
 138         int "CPU clock rate [MHz]"
 139         depends on !XTENSA_CALIBRATE_CCOUNT
 140         default "16"
 141
 142 config GENERIC_CALIBRATE_DELAY
 143         bool "Auto calibration of the BogoMIPS value"
 144         ---help---
 145           The BogoMIPS value can easily be derived from the CPU frequency.
 146
 147 config CMDLINE_BOOL
 148         bool "Default bootloader kernel arguments"
 149
 150 config CMDLINE
 151         string "Initial kernel command string"
 152         depends on CMDLINE_BOOL
 153         default "console=ttyS0,38400 root=/dev/ram"
 154         help
 155           On some architectures (EBSA110 and CATS), there is currently no way
 156           for the boot loader to pass arguments to the kernel. For these
 157           architectures, you should supply some command-line options at build
 158           time by entering them here. As a minimum, you should specify the
 159           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 160
 161 config SERIAL_CONSOLE
 162         bool
 163         depends on XTENSA_PLATFORM_ISS
 164         default y
 165
 166 config XTENSA_ISS_NETWORK
 167         bool
 168         depends on XTENSA_PLATFORM_ISS
 169         default y
 170
 171 source "mm/Kconfig"
 172
 173 endmenu
 174
 175 menu "Bus options"
 176
 177 config PCI
 178         bool "PCI support" if !XTENSA_PLATFORM_ISS
 179         depends on !XTENSA_PLATFORM_ISS
 180         default y
 181         help
 182           Find out whether you have a PCI motherboard. PCI is the name of a
 183           bus system, i.e. the way the CPU talks to the other stuff inside
 184           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 185           VESA. If you have PCI, say Y, otherwise N.
 186
 187 source "drivers/pci/Kconfig"
 188
 189 config HOTPLUG
 190
 191         bool "Support for hot-pluggable devices"
 192         ---help---
 193         Say Y here if you want to plug devices into your computer while
 194         the system is running, and be able to use them quickly.  In many
 195         cases, the devices can likewise be unplugged at any time too.
 196
 197         One well known example of this is PCMCIA- or PC-cards, credit-card
 198         size devices such as network cards, modems or hard drives which are
 199         plugged into slots found on all modern laptop computers.  Another
 200         example, used on modern desktops as well as laptops, is USB.
 201
 202         Enable HOTPLUG and build a modular kernel.  Get agent software
 203         (from <http://linux-hotplug.sourceforge.net/>) and install it.
 204         Then your kernel will automatically call out to a user mode "policy
 205         agent" (/sbin/hotplug) to load modules and set up software needed
 206         to use devices as you hotplug them.
 207
 208 source "drivers/pcmcia/Kconfig"
 209
 210 source "drivers/pci/hotplug/Kconfig"
 211
 212 endmenu
 213
 214 menu "Executable file formats"
 215
 216 # only elf supported
 217 config KCORE_ELF
 218         bool
 219         depends on PROC_FS
 220         default y
 221         help
 222           If you enabled support for /proc file system then the file
 223           /proc/kcore will contain the kernel core image in ELF format. This
 224           can be used in gdb:
 225
 226           $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
 227
 228           This is especially useful if you have compiled the kernel with the
 229           "-g" option to preserve debugging information. It is mainly used
 230           for examining kernel data structures on the live kernel.
 231
 232 source "fs/Kconfig.binfmt"
 233
 234 endmenu
 235
 236 source "net/Kconfig"
 237
 238 source "drivers/Kconfig"
 239
 240 source "fs/Kconfig"
 241
 242 menu "Xtensa initrd options"
 243         depends on BLK_DEV_INITRD
 244
 245         config EMBEDDED_RAMDISK
 246         bool "Embed root filesystem ramdisk into the kernel"
 247
 248 config EMBEDDED_RAMDISK_IMAGE
 249         string "Filename of gzipped ramdisk image"
 250         depends on EMBEDDED_RAMDISK
 251         default "ramdisk.gz"
 252         help
 253           This is the filename of the ramdisk image to be built into the
 254           kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
 255           The ramdisk image is not part of the kernel distribution; you must
 256           provide one yourself.
 257 endmenu
 258
 259 source "arch/xtensa/Kconfig.debug"
 260
 261 source "security/Kconfig"
 262
 263 source "crypto/Kconfig"
 264
 265 source "lib/Kconfig"
 266
 267