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 def_bool n 8 9config ZONE_DMA 10 def_bool y 11 12config XTENSA 13 def_bool y 14 select HAVE_IDE 15 help 16 Xtensa processors are 32-bit RISC machines designed by Tensilica 17 primarily for embedded systems. These processors are both 18 configurable and extensible. The Linux port to the Xtensa 19 architecture supports all processor configurations and extensions, 20 with reasonable minimum requirements. The Xtensa Linux project has 21 a home page at <http://xtensa.sourceforge.net/>. 22 23config RWSEM_XCHGADD_ALGORITHM 24 def_bool y 25 26config GENERIC_FIND_NEXT_BIT 27 def_bool y 28 29config GENERIC_HWEIGHT 30 def_bool y 31 32config GENERIC_HARDIRQS 33 def_bool y 34 35config GENERIC_GPIO 36 def_bool y 37 38config ARCH_HAS_ILOG2_U32 39 def_bool n 40 41config ARCH_HAS_ILOG2_U64 42 def_bool n 43 44config NO_IOPORT 45 def_bool y 46 47config HZ 48 int 49 default 100 50 51config GENERIC_TIME 52 def_bool y 53 54source "init/Kconfig" 55source "kernel/Kconfig.freezer" 56 57config MMU 58 def_bool n 59 60config VARIANT_IRQ_SWITCH 61 def_bool n 62 63menu "Processor type and features" 64 65choice 66 prompt "Xtensa Processor Configuration" 67 default XTENSA_VARIANT_FSF 68 69config XTENSA_VARIANT_FSF 70 bool "fsf - default (not generic) configuration" 71 select MMU 72 73config XTENSA_VARIANT_DC232B 74 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" 75 select MMU 76 help 77 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). 78 79config XTENSA_VARIANT_S6000 80 bool "s6000 - Stretch software configurable processor" 81 select VARIANT_IRQ_SWITCH 82 select ARCH_REQUIRE_GPIOLIB 83 select XTENSA_CALIBRATE_CCOUNT 84endchoice 85 86config XTENSA_UNALIGNED_USER 87 bool "Unaligned memory access in use space" 88 help 89 The Xtensa architecture currently does not handle unaligned 90 memory accesses in hardware but through an exception handler. 91 Per default, unaligned memory accesses are disabled in user space. 92 93 Say Y here to enable unaligned memory access in user space. 94 95config PREEMPT 96 bool "Preemptible Kernel" 97 help 98 This option reduces the latency of the kernel when reacting to 99 real-time or interactive events by allowing a low priority process to 100 be preempted even if it is in kernel mode executing a system call. 101 Unfortunately the kernel code has some race conditions if both 102 CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is 103 currently disabled if you are building an SMP kernel. 104 105 Say Y here if you are building a kernel for a desktop, embedded 106 or real-time system. Say N if you are unsure. 107 108config MATH_EMULATION 109 bool "Math emulation" 110 help 111 Can we use information of configuration file? 112 113endmenu 114 115config XTENSA_CALIBRATE_CCOUNT 116 def_bool n 117 help 118 On some platforms (XT2000, for example), the CPU clock rate can 119 vary. The frequency can be determined, however, by measuring 120 against a well known, fixed frequency, such as an UART oscillator. 121 122config SERIAL_CONSOLE 123 def_bool n 124 125config XTENSA_ISS_NETWORK 126 def_bool n 127 128menu "Bus options" 129 130config PCI 131 bool "PCI support" 132 default y 133 help 134 Find out whether you have a PCI motherboard. PCI is the name of a 135 bus system, i.e. the way the CPU talks to the other stuff inside 136 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 137 VESA. If you have PCI, say Y, otherwise N. 138 139source "drivers/pci/Kconfig" 140 141endmenu 142 143menu "Platform options" 144 145choice 146 prompt "Xtensa System Type" 147 default XTENSA_PLATFORM_ISS 148 149config XTENSA_PLATFORM_ISS 150 bool "ISS" 151 select XTENSA_CALIBRATE_CCOUNT 152 select SERIAL_CONSOLE 153 select XTENSA_ISS_NETWORK 154 help 155 ISS is an acronym for Tensilica's Instruction Set Simulator. 156 157config XTENSA_PLATFORM_XT2000 158 bool "XT2000" 159 help 160 XT2000 is the name of Tensilica's feature-rich emulation platform. 161 This hardware is capable of running a full Linux distribution. 162 163config XTENSA_PLATFORM_S6105 164 bool "S6105" 165 select SERIAL_CONSOLE 166 167endchoice 168 169 170config XTENSA_CPU_CLOCK 171 int "CPU clock rate [MHz]" 172 depends on !XTENSA_CALIBRATE_CCOUNT 173 default 16 174 175config GENERIC_CALIBRATE_DELAY 176 bool "Auto calibration of the BogoMIPS value" 177 help 178 The BogoMIPS value can easily be derived from the CPU frequency. 179 180config CMDLINE_BOOL 181 bool "Default bootloader kernel arguments" 182 183config CMDLINE 184 string "Initial kernel command string" 185 depends on CMDLINE_BOOL 186 default "console=ttyS0,38400 root=/dev/ram" 187 help 188 On some architectures (EBSA110 and CATS), there is currently no way 189 for the boot loader to pass arguments to the kernel. For these 190 architectures, you should supply some command-line options at build 191 time by entering them here. As a minimum, you should specify the 192 memory size and the root device (e.g., mem=64M root=/dev/nfs). 193 194source "mm/Kconfig" 195 196config HOTPLUG 197 bool "Support for hot-pluggable devices" 198 help 199 Say Y here if you want to plug devices into your computer while 200 the system is running, and be able to use them quickly. In many 201 cases, the devices can likewise be unplugged at any time too. 202 203 One well known example of this is PCMCIA- or PC-cards, credit-card 204 size devices such as network cards, modems or hard drives which are 205 plugged into slots found on all modern laptop computers. Another 206 example, used on modern desktops as well as laptops, is USB. 207 208 Enable HOTPLUG and build a modular kernel. Get agent software 209 (from <http://linux-hotplug.sourceforge.net/>) and install it. 210 Then your kernel will automatically call out to a user mode "policy 211 agent" (/sbin/hotplug) to load modules and set up software needed 212 to use devices as you hotplug them. 213 214source "drivers/pcmcia/Kconfig" 215 216source "drivers/pci/hotplug/Kconfig" 217 218endmenu 219 220menu "Executable file formats" 221 222# only elf supported 223config KCORE_ELF 224 def_bool y 225 depends on PROC_FS 226 help 227 If you enabled support for /proc file system then the file 228 /proc/kcore will contain the kernel core image in ELF format. This 229 can be used in gdb: 230 231 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore 232 233 This is especially useful if you have compiled the kernel with the 234 "-g" option to preserve debugging information. It is mainly used 235 for examining kernel data structures on the live kernel. 236 237source "fs/Kconfig.binfmt" 238 239endmenu 240 241source "net/Kconfig" 242 243source "drivers/Kconfig" 244 245source "fs/Kconfig" 246 247menu "Xtensa initrd options" 248 depends on BLK_DEV_INITRD 249 250config EMBEDDED_RAMDISK 251 bool "Embed root filesystem ramdisk into the kernel" 252 253config EMBEDDED_RAMDISK_IMAGE 254 string "Filename of gzipped ramdisk image" 255 depends on EMBEDDED_RAMDISK 256 default "ramdisk.gz" 257 help 258 This is the filename of the ramdisk image to be built into the 259 kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/. 260 The ramdisk image is not part of the kernel distribution; you must 261 provide one yourself. 262endmenu 263 264source "arch/xtensa/Kconfig.debug" 265 266source "security/Kconfig" 267 268source "crypto/Kconfig" 269 270source "lib/Kconfig" 271 272 273