10 select HAVE_GENERIC_HARDIRQS
11 select GENERIC_IRQ_SHOW
13 Xtensa processors are 32-bit RISC machines designed by Tensilica
14 primarily for embedded systems. These processors are both
15 configurable and extensible. The Linux port to the Xtensa
16 architecture supports all processor configurations and extensions,
17 with reasonable minimum requirements. The Xtensa Linux project has
18 a home page at <http://xtensa.sourceforge.net/>.
20 config RWSEM_XCHGADD_ALGORITHM
23 config GENERIC_FIND_NEXT_BIT
26 config GENERIC_FIND_BIT_LE
29 config GENERIC_HWEIGHT
35 config ARCH_HAS_ILOG2_U32
38 config ARCH_HAS_ILOG2_U64
49 source "kernel/Kconfig.freezer"
54 config VARIANT_IRQ_SWITCH
57 menu "Processor type and features"
60 prompt "Xtensa Processor Configuration"
61 default XTENSA_VARIANT_FSF
63 config XTENSA_VARIANT_FSF
64 bool "fsf - default (not generic) configuration"
67 config XTENSA_VARIANT_DC232B
68 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
71 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
73 config XTENSA_VARIANT_S6000
74 bool "s6000 - Stretch software configurable processor"
75 select VARIANT_IRQ_SWITCH
76 select ARCH_REQUIRE_GPIOLIB
77 select XTENSA_CALIBRATE_CCOUNT
80 config XTENSA_UNALIGNED_USER
81 bool "Unaligned memory access in use space"
83 The Xtensa architecture currently does not handle unaligned
84 memory accesses in hardware but through an exception handler.
85 Per default, unaligned memory accesses are disabled in user space.
87 Say Y here to enable unaligned memory access in user space.
90 bool "Preemptible Kernel"
92 This option reduces the latency of the kernel when reacting to
93 real-time or interactive events by allowing a low priority process to
94 be preempted even if it is in kernel mode executing a system call.
95 Unfortunately the kernel code has some race conditions if both
96 CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
97 currently disabled if you are building an SMP kernel.
99 Say Y here if you are building a kernel for a desktop, embedded
100 or real-time system. Say N if you are unsure.
102 config MATH_EMULATION
103 bool "Math emulation"
105 Can we use information of configuration file?
109 config XTENSA_CALIBRATE_CCOUNT
112 On some platforms (XT2000, for example), the CPU clock rate can
113 vary. The frequency can be determined, however, by measuring
114 against a well known, fixed frequency, such as an UART oscillator.
116 config SERIAL_CONSOLE
119 config XTENSA_ISS_NETWORK
128 Find out whether you have a PCI motherboard. PCI is the name of a
129 bus system, i.e. the way the CPU talks to the other stuff inside
130 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
131 VESA. If you have PCI, say Y, otherwise N.
133 source "drivers/pci/Kconfig"
137 menu "Platform options"
140 prompt "Xtensa System Type"
141 default XTENSA_PLATFORM_ISS
143 config XTENSA_PLATFORM_ISS
145 select XTENSA_CALIBRATE_CCOUNT
146 select SERIAL_CONSOLE
147 select XTENSA_ISS_NETWORK
149 ISS is an acronym for Tensilica's Instruction Set Simulator.
151 config XTENSA_PLATFORM_XT2000
154 XT2000 is the name of Tensilica's feature-rich emulation platform.
155 This hardware is capable of running a full Linux distribution.
157 config XTENSA_PLATFORM_S6105
159 select SERIAL_CONSOLE
164 config XTENSA_CPU_CLOCK
165 int "CPU clock rate [MHz]"
166 depends on !XTENSA_CALIBRATE_CCOUNT
169 config GENERIC_CALIBRATE_DELAY
170 bool "Auto calibration of the BogoMIPS value"
172 The BogoMIPS value can easily be derived from the CPU frequency.
175 bool "Default bootloader kernel arguments"
178 string "Initial kernel command string"
179 depends on CMDLINE_BOOL
180 default "console=ttyS0,38400 root=/dev/ram"
182 On some architectures (EBSA110 and CATS), there is currently no way
183 for the boot loader to pass arguments to the kernel. For these
184 architectures, you should supply some command-line options at build
185 time by entering them here. As a minimum, you should specify the
186 memory size and the root device (e.g., mem=64M root=/dev/nfs).
191 bool "Support for hot-pluggable devices"
193 Say Y here if you want to plug devices into your computer while
194 the system is running, and be able to use them quickly. In many
195 cases, the devices can likewise be unplugged at any time too.
197 One well known example of this is PCMCIA- or PC-cards, credit-card
198 size devices such as network cards, modems or hard drives which are
199 plugged into slots found on all modern laptop computers. Another
200 example, used on modern desktops as well as laptops, is USB.
202 Enable HOTPLUG and build a modular kernel. Get agent software
203 (from <http://linux-hotplug.sourceforge.net/>) and install it.
204 Then your kernel will automatically call out to a user mode "policy
205 agent" (/sbin/hotplug) to load modules and set up software needed
206 to use devices as you hotplug them.
208 source "drivers/pcmcia/Kconfig"
210 source "drivers/pci/hotplug/Kconfig"
214 menu "Executable file formats"
221 If you enabled support for /proc file system then the file
222 /proc/kcore will contain the kernel core image in ELF format. This
225 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
227 This is especially useful if you have compiled the kernel with the
228 "-g" option to preserve debugging information. It is mainly used
229 for examining kernel data structures on the live kernel.
231 source "fs/Kconfig.binfmt"
237 source "drivers/Kconfig"
241 menu "Xtensa initrd options"
242 depends on BLK_DEV_INITRD
244 config EMBEDDED_RAMDISK
245 bool "Embed root filesystem ramdisk into the kernel"
247 config EMBEDDED_RAMDISK_IMAGE
248 string "Filename of gzipped ramdisk image"
249 depends on EMBEDDED_RAMDISK
252 This is the filename of the ramdisk image to be built into the
253 kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
254 The ramdisk image is not part of the kernel distribution; you must
255 provide one yourself.
258 source "arch/xtensa/Kconfig.debug"
260 source "security/Kconfig"
262 source "crypto/Kconfig"