Kconfig 6.8 KB

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  1. # For a description of the syntax of this configuration file,
  2. # see Documentation/kbuild/kconfig-language.txt.
  3. mainmenu "Linux/Xtensa Kernel Configuration"
  4. config FRAME_POINTER
  5. def_bool n
  6. config ZONE_DMA
  7. def_bool y
  8. config XTENSA
  9. def_bool y
  10. select HAVE_IDE
  11. help
  12. Xtensa processors are 32-bit RISC machines designed by Tensilica
  13. primarily for embedded systems. These processors are both
  14. configurable and extensible. The Linux port to the Xtensa
  15. architecture supports all processor configurations and extensions,
  16. with reasonable minimum requirements. The Xtensa Linux project has
  17. a home page at <http://xtensa.sourceforge.net/>.
  18. config RWSEM_XCHGADD_ALGORITHM
  19. def_bool y
  20. config GENERIC_FIND_NEXT_BIT
  21. def_bool y
  22. config GENERIC_HWEIGHT
  23. def_bool y
  24. config GENERIC_HARDIRQS
  25. def_bool y
  26. config GENERIC_GPIO
  27. def_bool y
  28. config ARCH_HAS_ILOG2_U32
  29. def_bool n
  30. config ARCH_HAS_ILOG2_U64
  31. def_bool n
  32. config NO_IOPORT
  33. def_bool y
  34. config HZ
  35. int
  36. default 100
  37. source "init/Kconfig"
  38. source "kernel/Kconfig.freezer"
  39. config MMU
  40. def_bool n
  41. config VARIANT_IRQ_SWITCH
  42. def_bool n
  43. menu "Processor type and features"
  44. choice
  45. prompt "Xtensa Processor Configuration"
  46. default XTENSA_VARIANT_FSF
  47. config XTENSA_VARIANT_FSF
  48. bool "fsf - default (not generic) configuration"
  49. select MMU
  50. config XTENSA_VARIANT_DC232B
  51. bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  52. select MMU
  53. help
  54. This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  55. config XTENSA_VARIANT_S6000
  56. bool "s6000 - Stretch software configurable processor"
  57. select VARIANT_IRQ_SWITCH
  58. select ARCH_REQUIRE_GPIOLIB
  59. endchoice
  60. config XTENSA_UNALIGNED_USER
  61. bool "Unaligned memory access in use space"
  62. help
  63. The Xtensa architecture currently does not handle unaligned
  64. memory accesses in hardware but through an exception handler.
  65. Per default, unaligned memory accesses are disabled in user space.
  66. Say Y here to enable unaligned memory access in user space.
  67. config PREEMPT
  68. bool "Preemptible Kernel"
  69. help
  70. This option reduces the latency of the kernel when reacting to
  71. real-time or interactive events by allowing a low priority process to
  72. be preempted even if it is in kernel mode executing a system call.
  73. Unfortunately the kernel code has some race conditions if both
  74. CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
  75. currently disabled if you are building an SMP kernel.
  76. Say Y here if you are building a kernel for a desktop, embedded
  77. or real-time system. Say N if you are unsure.
  78. config MATH_EMULATION
  79. bool "Math emulation"
  80. help
  81. Can we use information of configuration file?
  82. endmenu
  83. config XTENSA_CALIBRATE_CCOUNT
  84. def_bool n
  85. help
  86. On some platforms (XT2000, for example), the CPU clock rate can
  87. vary. The frequency can be determined, however, by measuring
  88. against a well known, fixed frequency, such as an UART oscillator.
  89. config SERIAL_CONSOLE
  90. def_bool n
  91. config XTENSA_ISS_NETWORK
  92. def_bool n
  93. menu "Bus options"
  94. config PCI
  95. bool "PCI support"
  96. default y
  97. help
  98. Find out whether you have a PCI motherboard. PCI is the name of a
  99. bus system, i.e. the way the CPU talks to the other stuff inside
  100. your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
  101. VESA. If you have PCI, say Y, otherwise N.
  102. source "drivers/pci/Kconfig"
  103. menu "Platform options"
  104. choice
  105. prompt "Xtensa System Type"
  106. default XTENSA_PLATFORM_ISS
  107. config XTENSA_PLATFORM_ISS
  108. bool "ISS"
  109. select XTENSA_CALIBRATE_CCOUNT
  110. select SERIAL_CONSOLE
  111. select XTENSA_ISS_NETWORK
  112. help
  113. ISS is an acronym for Tensilica's Instruction Set Simulator.
  114. config XTENSA_PLATFORM_XT2000
  115. bool "XT2000"
  116. select XTENSA_CALIBRATE_CCOUNT
  117. select PCI
  118. help
  119. XT2000 is the name of Tensilica's feature-rich emulation platform.
  120. This hardware is capable of running a full Linux distribution.
  121. endchoice
  122. config XTENSA_CPU_CLOCK
  123. int "CPU clock rate [MHz]"
  124. depends on !XTENSA_CALIBRATE_CCOUNT
  125. default 16
  126. config GENERIC_CALIBRATE_DELAY
  127. bool "Auto calibration of the BogoMIPS value"
  128. help
  129. The BogoMIPS value can easily be derived from the CPU frequency.
  130. config CMDLINE_BOOL
  131. bool "Default bootloader kernel arguments"
  132. config CMDLINE
  133. string "Initial kernel command string"
  134. depends on CMDLINE_BOOL
  135. default "console=ttyS0,38400 root=/dev/ram"
  136. help
  137. On some architectures (EBSA110 and CATS), there is currently no way
  138. for the boot loader to pass arguments to the kernel. For these
  139. architectures, you should supply some command-line options at build
  140. time by entering them here. As a minimum, you should specify the
  141. memory size and the root device (e.g., mem=64M root=/dev/nfs).
  142. source "mm/Kconfig"
  143. endmenu
  144. config HOTPLUG
  145. bool "Support for hot-pluggable devices"
  146. help
  147. Say Y here if you want to plug devices into your computer while
  148. the system is running, and be able to use them quickly. In many
  149. cases, the devices can likewise be unplugged at any time too.
  150. One well known example of this is PCMCIA- or PC-cards, credit-card
  151. size devices such as network cards, modems or hard drives which are
  152. plugged into slots found on all modern laptop computers. Another
  153. example, used on modern desktops as well as laptops, is USB.
  154. Enable HOTPLUG and build a modular kernel. Get agent software
  155. (from <http://linux-hotplug.sourceforge.net/>) and install it.
  156. Then your kernel will automatically call out to a user mode "policy
  157. agent" (/sbin/hotplug) to load modules and set up software needed
  158. to use devices as you hotplug them.
  159. source "drivers/pcmcia/Kconfig"
  160. source "drivers/pci/hotplug/Kconfig"
  161. endmenu
  162. menu "Executable file formats"
  163. # only elf supported
  164. config KCORE_ELF
  165. def_bool y
  166. depends on PROC_FS
  167. help
  168. If you enabled support for /proc file system then the file
  169. /proc/kcore will contain the kernel core image in ELF format. This
  170. can be used in gdb:
  171. $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
  172. This is especially useful if you have compiled the kernel with the
  173. "-g" option to preserve debugging information. It is mainly used
  174. for examining kernel data structures on the live kernel.
  175. source "fs/Kconfig.binfmt"
  176. endmenu
  177. source "net/Kconfig"
  178. source "drivers/Kconfig"
  179. source "fs/Kconfig"
  180. menu "Xtensa initrd options"
  181. depends on BLK_DEV_INITRD
  182. config EMBEDDED_RAMDISK
  183. bool "Embed root filesystem ramdisk into the kernel"
  184. config EMBEDDED_RAMDISK_IMAGE
  185. string "Filename of gzipped ramdisk image"
  186. depends on EMBEDDED_RAMDISK
  187. default "ramdisk.gz"
  188. help
  189. This is the filename of the ramdisk image to be built into the
  190. kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
  191. The ramdisk image is not part of the kernel distribution; you must
  192. provide one yourself.
  193. endmenu
  194. source "arch/xtensa/Kconfig.debug"
  195. source "security/Kconfig"
  196. source "crypto/Kconfig"
  197. source "lib/Kconfig"