1# For a description of the syntax of this configuration file, 2# see Documentation/kbuild/kconfig-language.txt. 3 4mainmenu "Linux/Xtensa Kernel Configuration" 5 6config FRAME_POINTER 7 bool 8 default n 9 10config ZONE_DMA 11 bool 12 default y 13 14config 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 26config RWSEM_XCHGADD_ALGORITHM 27 bool 28 default y 29 30config GENERIC_FIND_NEXT_BIT 31 bool 32 default y 33 34config GENERIC_HWEIGHT 35 bool 36 default y 37 38config GENERIC_HARDIRQS 39 bool 40 default y 41 42config ARCH_HAS_ILOG2_U32 43 bool 44 default n 45 46config ARCH_HAS_ILOG2_U64 47 bool 48 default n 49 50config NO_IOPORT 51 def_bool y 52 53config HZ 54 int 55 default 100 56 57source "init/Kconfig" 58source "kernel/Kconfig.freezer" 59 60menu "Processor type and features" 61 62choice 63 prompt "Xtensa Processor Configuration" 64 default XTENSA_VARIANT_FSF 65 66config XTENSA_VARIANT_FSF 67 bool "fsf - default (not generic) configuration" 68 69config 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). 73endchoice 74 75config MMU 76 bool 77 default y 78 79config 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 88config 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 101config MATH_EMULATION 102 bool "Math emulation" 103 help 104 Can we use information of configuration file? 105 106endmenu 107 108menu "Platform options" 109 110choice 111 prompt "Xtensa System Type" 112 default XTENSA_PLATFORM_ISS 113 114config XTENSA_PLATFORM_ISS 115 bool "ISS" 116 help 117 ISS is an acronym for Tensilica's Instruction Set Simulator. 118 119config 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 125endchoice 126 127 128config 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 135config XTENSA_CPU_CLOCK 136 int "CPU clock rate [MHz]" 137 depends on !XTENSA_CALIBRATE_CCOUNT 138 default "16" 139 140config 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 145config CMDLINE_BOOL 146 bool "Default bootloader kernel arguments" 147 148config 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 159config SERIAL_CONSOLE 160 bool 161 depends on XTENSA_PLATFORM_ISS 162 default y 163 164config XTENSA_ISS_NETWORK 165 bool 166 depends on XTENSA_PLATFORM_ISS 167 default y 168 169source "mm/Kconfig" 170 171endmenu 172 173menu "Bus options" 174 175config 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 185source "drivers/pci/Kconfig" 186 187config 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 206source "drivers/pcmcia/Kconfig" 207 208source "drivers/pci/hotplug/Kconfig" 209 210endmenu 211 212menu "Executable file formats" 213 214# only elf supported 215config 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 230source "fs/Kconfig.binfmt" 231 232endmenu 233 234source "net/Kconfig" 235 236source "drivers/Kconfig" 237 238source "fs/Kconfig" 239 240menu "Xtensa initrd options" 241 depends on BLK_DEV_INITRD 242 243 config EMBEDDED_RAMDISK 244 bool "Embed root filesystem ramdisk into the kernel" 245 246config 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. 255endmenu 256 257source "arch/xtensa/Kconfig.debug" 258 259source "security/Kconfig" 260 261source "crypto/Kconfig" 262 263source "lib/Kconfig" 264 265 266