10 select GENERIC_ATOMIC64
11 select HAVE_GENERIC_HARDIRQS
12 select HAVE_VIRT_TO_BUS
13 select GENERIC_IRQ_SHOW
14 select GENERIC_CPU_DEVICES
15 select MODULES_USE_ELF_RELA
16 select GENERIC_PCI_IOMAP
17 select ARCH_WANT_IPC_PARSE_VERSION
18 select ARCH_WANT_OPTIONAL_GPIOLIB
19 select CLONE_BACKWARDS
23 Xtensa processors are 32-bit RISC machines designed by Tensilica
24 primarily for embedded systems. These processors are both
25 configurable and extensible. The Linux port to the Xtensa
26 architecture supports all processor configurations and extensions,
27 with reasonable minimum requirements. The Xtensa Linux project has
28 a home page at <http://www.linux-xtensa.org/>.
30 config RWSEM_XCHGADD_ALGORITHM
33 config GENERIC_HWEIGHT
39 config ARCH_HAS_ILOG2_U32
42 config ARCH_HAS_ILOG2_U64
53 source "kernel/Kconfig.freezer"
58 config VARIANT_IRQ_SWITCH
61 menu "Processor type and features"
64 prompt "Xtensa Processor Configuration"
65 default XTENSA_VARIANT_FSF
67 config XTENSA_VARIANT_FSF
68 bool "fsf - default (not generic) configuration"
71 config XTENSA_VARIANT_DC232B
72 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
75 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
77 config XTENSA_VARIANT_DC233C
78 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
81 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
83 config XTENSA_VARIANT_S6000
84 bool "s6000 - Stretch software configurable processor"
85 select VARIANT_IRQ_SWITCH
86 select ARCH_REQUIRE_GPIOLIB
87 select XTENSA_CALIBRATE_CCOUNT
90 config XTENSA_UNALIGNED_USER
91 bool "Unaligned memory access in use space"
93 The Xtensa architecture currently does not handle unaligned
94 memory accesses in hardware but through an exception handler.
95 Per default, unaligned memory accesses are disabled in user space.
97 Say Y here to enable unaligned memory access in user space.
99 source "kernel/Kconfig.preempt"
101 config MATH_EMULATION
102 bool "Math emulation"
104 Can we use information of configuration file?
108 config XTENSA_CALIBRATE_CCOUNT
111 On some platforms (XT2000, for example), the CPU clock rate can
112 vary. The frequency can be determined, however, by measuring
113 against a well known, fixed frequency, such as an UART oscillator.
115 config SERIAL_CONSOLE
118 config XTENSA_ISS_NETWORK
127 Find out whether you have a PCI motherboard. PCI is the name of a
128 bus system, i.e. the way the CPU talks to the other stuff inside
129 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
130 VESA. If you have PCI, say Y, otherwise N.
132 source "drivers/pci/Kconfig"
136 menu "Platform options"
139 prompt "Xtensa System Type"
140 default XTENSA_PLATFORM_ISS
142 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
162 config XTENSA_PLATFORM_XTFPGA
164 select SERIAL_CONSOLE
166 select XTENSA_CALIBRATE_CCOUNT
168 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
169 This hardware is capable of running a full Linux distribution.
174 config XTENSA_CPU_CLOCK
175 int "CPU clock rate [MHz]"
176 depends on !XTENSA_CALIBRATE_CCOUNT
179 config GENERIC_CALIBRATE_DELAY
180 bool "Auto calibration of the BogoMIPS value"
182 The BogoMIPS value can easily be derived from the CPU frequency.
185 bool "Default bootloader kernel arguments"
188 string "Initial kernel command string"
189 depends on CMDLINE_BOOL
190 default "console=ttyS0,38400 root=/dev/ram"
192 On some architectures (EBSA110 and CATS), there is currently no way
193 for the boot loader to pass arguments to the kernel. For these
194 architectures, you should supply some command-line options at build
195 time by entering them here. As a minimum, you should specify the
196 memory size and the root device (e.g., mem=64M root=/dev/nfs).
199 bool "Flattened Device Tree support"
201 select OF_EARLY_FLATTREE
203 Include support for flattened device tree machine descriptions.
206 string "DTB to build into the kernel image"
209 config BLK_DEV_SIMDISK
210 tristate "Host file-based simulated block device support"
212 depends on XTENSA_PLATFORM_ISS
214 Create block devices that map to files in the host file system.
215 Device binding to host file may be changed at runtime via proc
216 interface provided the device is not in use.
218 config BLK_DEV_SIMDISK_COUNT
219 int "Number of host file-based simulated block devices"
221 depends on BLK_DEV_SIMDISK
224 This is the default minimal number of created block devices.
225 Kernel/module parameter 'simdisk_count' may be used to change this
226 value at runtime. More file names (but no more than 10) may be
227 specified as parameters, simdisk_count grows accordingly.
229 config SIMDISK0_FILENAME
230 string "Host filename for the first simulated device"
231 depends on BLK_DEV_SIMDISK = y
234 Attach a first simdisk to a host file. Conventionally, this file
235 contains a root file system.
237 config SIMDISK1_FILENAME
238 string "Host filename for the second simulated device"
239 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
242 Another simulated disk in a host file for a buildroot-independent
247 source "drivers/pcmcia/Kconfig"
249 source "drivers/pci/hotplug/Kconfig"
253 menu "Executable file formats"
260 If you enabled support for /proc file system then the file
261 /proc/kcore will contain the kernel core image in ELF format. This
264 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
266 This is especially useful if you have compiled the kernel with the
267 "-g" option to preserve debugging information. It is mainly used
268 for examining kernel data structures on the live kernel.
270 source "fs/Kconfig.binfmt"
276 source "drivers/Kconfig"
280 source "arch/xtensa/Kconfig.debug"
282 source "security/Kconfig"
284 source "crypto/Kconfig"