10 select HAVE_GENERIC_HARDIRQS
11 select GENERIC_IRQ_SHOW
12 select GENERIC_HARDIRQS_NO_DEPRECATED
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/>.
21 config RWSEM_XCHGADD_ALGORITHM
24 config GENERIC_FIND_NEXT_BIT
27 config GENERIC_FIND_BIT_LE
30 config GENERIC_HWEIGHT
36 config ARCH_HAS_ILOG2_U32
39 config ARCH_HAS_ILOG2_U64
50 source "kernel/Kconfig.freezer"
55 config VARIANT_IRQ_SWITCH
58 menu "Processor type and features"
61 prompt "Xtensa Processor Configuration"
62 default XTENSA_VARIANT_FSF
64 config XTENSA_VARIANT_FSF
65 bool "fsf - default (not generic) configuration"
68 config XTENSA_VARIANT_DC232B
69 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
72 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
74 config XTENSA_VARIANT_S6000
75 bool "s6000 - Stretch software configurable processor"
76 select VARIANT_IRQ_SWITCH
77 select ARCH_REQUIRE_GPIOLIB
78 select XTENSA_CALIBRATE_CCOUNT
81 config XTENSA_UNALIGNED_USER
82 bool "Unaligned memory access in use space"
84 The Xtensa architecture currently does not handle unaligned
85 memory accesses in hardware but through an exception handler.
86 Per default, unaligned memory accesses are disabled in user space.
88 Say Y here to enable unaligned memory access in user space.
91 bool "Preemptible Kernel"
93 This option reduces the latency of the kernel when reacting to
94 real-time or interactive events by allowing a low priority process to
95 be preempted even if it is in kernel mode executing a system call.
96 Unfortunately the kernel code has some race conditions if both
97 CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
98 currently disabled if you are building an SMP kernel.
100 Say Y here if you are building a kernel for a desktop, embedded
101 or real-time system. Say N if you are unsure.
103 config MATH_EMULATION
104 bool "Math emulation"
106 Can we use information of configuration file?
110 config XTENSA_CALIBRATE_CCOUNT
113 On some platforms (XT2000, for example), the CPU clock rate can
114 vary. The frequency can be determined, however, by measuring
115 against a well known, fixed frequency, such as an UART oscillator.
117 config SERIAL_CONSOLE
120 config XTENSA_ISS_NETWORK
129 Find out whether you have a PCI motherboard. PCI is the name of a
130 bus system, i.e. the way the CPU talks to the other stuff inside
131 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
132 VESA. If you have PCI, say Y, otherwise N.
134 source "drivers/pci/Kconfig"
138 menu "Platform options"
141 prompt "Xtensa System Type"
142 default XTENSA_PLATFORM_ISS
144 config XTENSA_PLATFORM_ISS
146 select XTENSA_CALIBRATE_CCOUNT
147 select SERIAL_CONSOLE
148 select XTENSA_ISS_NETWORK
150 ISS is an acronym for Tensilica's Instruction Set Simulator.
152 config XTENSA_PLATFORM_XT2000
155 XT2000 is the name of Tensilica's feature-rich emulation platform.
156 This hardware is capable of running a full Linux distribution.
158 config XTENSA_PLATFORM_S6105
160 select SERIAL_CONSOLE
165 config XTENSA_CPU_CLOCK
166 int "CPU clock rate [MHz]"
167 depends on !XTENSA_CALIBRATE_CCOUNT
170 config GENERIC_CALIBRATE_DELAY
171 bool "Auto calibration of the BogoMIPS value"
173 The BogoMIPS value can easily be derived from the CPU frequency.
176 bool "Default bootloader kernel arguments"
179 string "Initial kernel command string"
180 depends on CMDLINE_BOOL
181 default "console=ttyS0,38400 root=/dev/ram"
183 On some architectures (EBSA110 and CATS), there is currently no way
184 for the boot loader to pass arguments to the kernel. For these
185 architectures, you should supply some command-line options at build
186 time by entering them here. As a minimum, you should specify the
187 memory size and the root device (e.g., mem=64M root=/dev/nfs).
192 bool "Support for hot-pluggable devices"
194 Say Y here if you want to plug devices into your computer while
195 the system is running, and be able to use them quickly. In many
196 cases, the devices can likewise be unplugged at any time too.
198 One well known example of this is PCMCIA- or PC-cards, credit-card
199 size devices such as network cards, modems or hard drives which are
200 plugged into slots found on all modern laptop computers. Another
201 example, used on modern desktops as well as laptops, is USB.
203 Enable HOTPLUG and build a modular kernel. Get agent software
204 (from <http://linux-hotplug.sourceforge.net/>) and install it.
205 Then your kernel will automatically call out to a user mode "policy
206 agent" (/sbin/hotplug) to load modules and set up software needed
207 to use devices as you hotplug them.
209 source "drivers/pcmcia/Kconfig"
211 source "drivers/pci/hotplug/Kconfig"
215 menu "Executable file formats"
222 If you enabled support for /proc file system then the file
223 /proc/kcore will contain the kernel core image in ELF format. This
226 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
228 This is especially useful if you have compiled the kernel with the
229 "-g" option to preserve debugging information. It is mainly used
230 for examining kernel data structures on the live kernel.
232 source "fs/Kconfig.binfmt"
238 source "drivers/Kconfig"
242 menu "Xtensa initrd options"
243 depends on BLK_DEV_INITRD
245 config EMBEDDED_RAMDISK
246 bool "Embed root filesystem ramdisk into the kernel"
248 config EMBEDDED_RAMDISK_IMAGE
249 string "Filename of gzipped ramdisk image"
250 depends on EMBEDDED_RAMDISK
253 This is the filename of the ramdisk image to be built into the
254 kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
255 The ramdisk image is not part of the kernel distribution; you must
256 provide one yourself.
259 source "arch/xtensa/Kconfig.debug"
261 source "security/Kconfig"
263 source "crypto/Kconfig"