arch/xtensa/Kconfig

   1 config FRAME_POINTER
   2         def_bool n
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config XTENSA
   8         def_bool y
   9         select HAVE_IDE
  10         select HAVE_GENERIC_HARDIRQS
  11         select GENERIC_IRQ_SHOW
  12         help
  13           Xtensa processors are 32-bit RISC machines designed by Tensilica
  14           primarily for embedded systems.  These processors are both
  15           configurable and extensible.  The Linux port to the Xtensa
  16           architecture supports all processor configurations and extensions,
  17           with reasonable minimum requirements.  The Xtensa Linux project has
  18           a home page at <http://xtensa.sourceforge.net/>.
  19
  20 config RWSEM_XCHGADD_ALGORITHM
  21         def_bool y
  22
  23 config GENERIC_HWEIGHT
  24         def_bool y
  25
  26 config GENERIC_GPIO
  27         def_bool y
  28
  29 config ARCH_HAS_ILOG2_U32
  30         def_bool n
  31
  32 config ARCH_HAS_ILOG2_U64
  33         def_bool n
  34
  35 config NO_IOPORT
  36         def_bool y
  37
  38 config HZ
  39         int
  40         default 100
  41
  42 source "init/Kconfig"
  43 source "kernel/Kconfig.freezer"
  44
  45 config MMU
  46         def_bool n
  47
  48 config VARIANT_IRQ_SWITCH
  49         def_bool n
  50
  51 menu "Processor type and features"
  52
  53 choice
  54         prompt "Xtensa Processor Configuration"
  55         default XTENSA_VARIANT_FSF
  56
  57 config XTENSA_VARIANT_FSF
  58         bool "fsf - default (not generic) configuration"
  59         select MMU
  60
  61 config XTENSA_VARIANT_DC232B
  62         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  63         select MMU
  64         help
  65           This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  66
  67 config XTENSA_VARIANT_S6000
  68         bool "s6000 - Stretch software configurable processor"
  69         select VARIANT_IRQ_SWITCH
  70         select ARCH_REQUIRE_GPIOLIB
  71         select XTENSA_CALIBRATE_CCOUNT
  72 endchoice
  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 endmenu
 102
 103 config XTENSA_CALIBRATE_CCOUNT
 104         def_bool n
 105         help
 106           On some platforms (XT2000, for example), the CPU clock rate can
 107           vary.  The frequency can be determined, however, by measuring
 108           against a well known, fixed frequency, such as an UART oscillator.
 109
 110 config SERIAL_CONSOLE
 111         def_bool n
 112
 113 config XTENSA_ISS_NETWORK
 114         def_bool n
 115
 116 menu "Bus options"
 117
 118 config PCI
 119         bool "PCI support"
 120         default y
 121         help
 122           Find out whether you have a PCI motherboard. PCI is the name of a
 123           bus system, i.e. the way the CPU talks to the other stuff inside
 124           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 125           VESA. If you have PCI, say Y, otherwise N.
 126
 127 source "drivers/pci/Kconfig"
 128
 129 endmenu
 130
 131 menu "Platform options"
 132
 133 choice
 134         prompt "Xtensa System Type"
 135         default XTENSA_PLATFORM_ISS
 136
 137 config XTENSA_PLATFORM_ISS
 138         bool "ISS"
 139         select XTENSA_CALIBRATE_CCOUNT
 140         select SERIAL_CONSOLE
 141         select XTENSA_ISS_NETWORK
 142         help
 143           ISS is an acronym for Tensilica's Instruction Set Simulator.
 144
 145 config XTENSA_PLATFORM_XT2000
 146         bool "XT2000"
 147         help
 148           XT2000 is the name of Tensilica's feature-rich emulation platform.
 149           This hardware is capable of running a full Linux distribution.
 150
 151 config XTENSA_PLATFORM_S6105
 152         bool "S6105"
 153         select SERIAL_CONSOLE
 154
 155 endchoice
 156
 157
 158 config XTENSA_CPU_CLOCK
 159         int "CPU clock rate [MHz]"
 160         depends on !XTENSA_CALIBRATE_CCOUNT
 161         default 16
 162
 163 config GENERIC_CALIBRATE_DELAY
 164         bool "Auto calibration of the BogoMIPS value"
 165         help
 166           The BogoMIPS value can easily be derived from the CPU frequency.
 167
 168 config CMDLINE_BOOL
 169         bool "Default bootloader kernel arguments"
 170
 171 config CMDLINE
 172         string "Initial kernel command string"
 173         depends on CMDLINE_BOOL
 174         default "console=ttyS0,38400 root=/dev/ram"
 175         help
 176           On some architectures (EBSA110 and CATS), there is currently no way
 177           for the boot loader to pass arguments to the kernel. For these
 178           architectures, you should supply some command-line options at build
 179           time by entering them here. As a minimum, you should specify the
 180           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 181
 182 source "mm/Kconfig"
 183
 184 config HOTPLUG
 185         bool "Support for hot-pluggable devices"
 186         help
 187           Say Y here if you want to plug devices into your computer while
 188           the system is running, and be able to use them quickly.  In many
 189           cases, the devices can likewise be unplugged at any time too.
 190
 191           One well known example of this is PCMCIA- or PC-cards, credit-card
 192           size devices such as network cards, modems or hard drives which are
 193           plugged into slots found on all modern laptop computers.  Another
 194           example, used on modern desktops as well as laptops, is USB.
 195
 196           Enable HOTPLUG and build a modular kernel.  Get agent software
 197           (from <http://linux-hotplug.sourceforge.net/>) and install it.
 198           Then your kernel will automatically call out to a user mode "policy
 199           agent" (/sbin/hotplug) to load modules and set up software needed
 200           to use devices as you hotplug them.
 201
 202 source "drivers/pcmcia/Kconfig"
 203
 204 source "drivers/pci/hotplug/Kconfig"
 205
 206 endmenu
 207
 208 menu "Executable file formats"
 209
 210 # only elf supported
 211 config KCORE_ELF
 212         def_bool y
 213         depends on PROC_FS
 214         help
 215           If you enabled support for /proc file system then the file
 216           /proc/kcore will contain the kernel core image in ELF format. This
 217           can be used in gdb:
 218
 219           $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
 220
 221           This is especially useful if you have compiled the kernel with the
 222           "-g" option to preserve debugging information. It is mainly used
 223           for examining kernel data structures on the live kernel.
 224
 225 source "fs/Kconfig.binfmt"
 226
 227 endmenu
 228
 229 source "net/Kconfig"
 230
 231 source "drivers/Kconfig"
 232
 233 source "fs/Kconfig"
 234
 235 menu "Xtensa initrd options"
 236         depends on BLK_DEV_INITRD
 237
 238 config EMBEDDED_RAMDISK
 239         bool "Embed root filesystem ramdisk into the kernel"
 240
 241 config EMBEDDED_RAMDISK_IMAGE
 242         string "Filename of gzipped ramdisk image"
 243         depends on EMBEDDED_RAMDISK
 244         default "ramdisk.gz"
 245         help
 246           This is the filename of the ramdisk image to be built into the
 247           kernel.  Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
 248           The ramdisk image is not part of the kernel distribution; you must
 249           provide one yourself.
 250 endmenu
 251
 252 source "arch/xtensa/Kconfig.debug"
 253
 254 source "security/Kconfig"
 255
 256 source "crypto/Kconfig"
 257
 258 source "lib/Kconfig"
 259
 260