arch/xtensa/Kconfig

   1 # For a description of the syntax of this configuration file,
   2 # see Documentation/kbuild/config-language.txt.
   3
   4 mainmenu "Linux/Xtensa Kernel Configuration"
   5
   6 config FRAME_POINTER
   7         bool
   8         default n
   9
  10 config XTENSA
  11         bool
  12         default y
  13         help
  14           Xtensa processors are 32-bit RISC machines designed by Tensilica
  15           primarily for embedded systems.  These processors are both
  16           configurable and extensible.  The Linux port to the Xtensa
  17           architecture supports all processor configurations and extensions,
  18           with reasonable minimum requirements.  The Xtensa Linux project has
  19           a home page at <http://xtensa.sourceforge.net/>.
  20
  21 config UID16
  22         bool
  23         default n
  24
  25 config RWSEM_XCHGADD_ALGORITHM
  26         bool
  27         default y
  28
  29 config HAVE_DEC_LOCK
  30         bool
  31         default y
  32
  33 config GENERIC_HARDIRQS
  34         bool
  35         default y
  36
  37 source "init/Kconfig"
  38
  39 menu "Processor type and features"
  40
  41 choice
  42         prompt "Xtensa Processor Configuration"
  43         default XTENSA_CPU_LINUX_BE
  44
  45 config XTENSA_CPU_LINUX_BE
  46         bool "linux_be"
  47         ---help---
  48           The linux_be processor configuration is the baseline Xtensa
  49           configurations included in this kernel and also used by
  50           binutils, gcc, and gdb. It contains no TIE, no coprocessors,
  51           and the following configuration options:
  52
  53           Code Density Option                2 Misc Special Registers
  54           NSA/NSAU Instructions              128-bit Data Bus Width
  55           Processor ID                       8K, 2-way I and D Caches
  56           Zero-Overhead Loops                2 Inst Address Break Registers
  57           Big Endian                         2 Data Address Break Registers
  58           64 General-Purpose Registers       JTAG Interface and Trace Port
  59           17 Interrupts                      MMU w/ TLBs and Autorefill
  60           3 Interrupt Levels                 8 Autorefill Ways (I/D TLBs)
  61           3 Timers                           Unaligned Exceptions
  62 endchoice
  63
  64 config MMU
  65         bool
  66         default y
  67
  68 config XTENSA_UNALIGNED_USER
  69         bool "Unaligned memory access in use space"
  70         ---help---
  71            The Xtensa architecture currently does not handle unaligned
  72            memory accesses in hardware but through an exception handler.
  73            Per default, unaligned memory accesses are disabled in user space.
  74
  75            Say Y here to enable unaligned memory access in user space.
  76
  77 config PREEMPT
  78         bool "Preemptible Kernel"
  79         ---help---
  80            This option reduces the latency of the kernel when reacting to
  81            real-time or interactive events by allowing a low priority process to
  82            be preempted even if it is in kernel mode executing a system call.
  83            Unfortunately the kernel code has some race conditions if both
  84            CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
  85            currently disabled if you are building an SMP kernel.
  86
  87            Say Y here if you are building a kernel for a desktop, embedded
  88            or real-time system.  Say N if you are unsure.
  89
  90 config MATH_EMULATION
  91         bool "Math emulation"
  92         help
  93         Can we use information of configuration file?
  94
  95 config HIGHMEM
  96         bool "High memory support"
  97
  98 endmenu
  99
 100 menu "Platform options"
 101
 102 choice
 103         prompt "Xtensa System Type"
 104         default XTENSA_PLATFORM_ISS
 105
 106 config XTENSA_PLATFORM_ISS
 107         bool "ISS"
 108         help
 109           ISS is an acronym for Tensilica's Instruction Set Simulator.
 110
 111 config XTENSA_PLATFORM_XT2000
 112         bool "XT2000"
 113         help
 114           XT2000 is the name of Tensilica's feature-rich emulation platform.
 115           This hardware is capable of running a full Linux distribution.
 116
 117 endchoice
 118
 119
 120 config XTENSA_CALIBRATE_CCOUNT
 121         bool "Auto calibration of the CPU clock rate"
 122         ---help---
 123           On some platforms (XT2000, for example), the CPU clock rate can
 124           vary.  The frequency can be determined, however, by measuring
 125           against a well known, fixed frequency, such as an UART oscillator.
 126
 127 config XTENSA_CPU_CLOCK
 128         int "CPU clock rate [MHz]"
 129         depends on !XTENSA_CALIBRATE_CCOUNT
 130         default "16"
 131
 132 config GENERIC_CALIBRATE_DELAY
 133         bool "Auto calibration of the BogoMIPS value"
 134         ---help---
 135           The BogoMIPS value can easily be derived from the CPU frequency.
 136
 137 config CMDLINE_BOOL
 138         bool "Default bootloader kernel arguments"
 139
 140 config CMDLINE
 141         string "Initial kernel command string"
 142         depends on CMDLINE_BOOL
 143         default "console=ttyS0,38400 root=/dev/ram"
 144         help
 145           On some architectures (EBSA110 and CATS), there is currently no way
 146           for the boot loader to pass arguments to the kernel. For these
 147           architectures, you should supply some command-line options at build
 148           time by entering them here. As a minimum, you should specify the
 149           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 150
 151 config SERIAL_CONSOLE
 152         bool
 153         depends on XTENSA_PLATFORM_ISS
 154         default y
 155
 156 config XTENSA_ISS_NETWORK
 157         bool
 158         depends on XTENSA_PLATFORM_ISS
 159         default y
 160
 161 source "mm/Kconfig"
 162
 163 endmenu
 164
 165 menu "Bus options"
 166
 167 config PCI
 168         bool "PCI support" if !XTENSA_PLATFORM_ISS
 169         depends on !XTENSA_PLATFORM_ISS
 170         default y
 171         help
 172           Find out whether you have a PCI motherboard. PCI is the name of a
 173           bus system, i.e. the way the CPU talks to the other stuff inside
 174           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 175           VESA. If you have PCI, say Y, otherwise N.
 176
 177           The PCI-HOWTO, available from
 178           <http://www.linuxdoc.org/docs.html#howto>, contains valuable
 179           information about which PCI hardware does work under Linux and which
 180           doesn't
 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 KMOD, and build a modular kernel.  Get agent
 198         software (at <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 "Exectuable 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 "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 gziped 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