6 select ARCH_WANT_FRAME_POINTERS
8 select GENERIC_ATOMIC64
9 select GENERIC_CLOCKEVENTS
11 select GENERIC_IRQ_SHOW
12 select GENERIC_SCHED_CLOCK
13 select MODULES_USE_ELF_RELA
14 select GENERIC_PCI_IOMAP
15 select ARCH_WANT_IPC_PARSE_VERSION
16 select ARCH_WANT_OPTIONAL_GPIOLIB
17 select CLONE_BACKWARDS
20 select HAVE_FUNCTION_TRACER
21 select HAVE_IRQ_TIME_ACCOUNTING
22 select HAVE_PERF_EVENTS
24 Xtensa processors are 32-bit RISC machines designed by Tensilica
25 primarily for embedded systems. These processors are both
26 configurable and extensible. The Linux port to the Xtensa
27 architecture supports all processor configurations and extensions,
28 with reasonable minimum requirements. The Xtensa Linux project has
29 a home page at <http://www.linux-xtensa.org/>.
31 config RWSEM_XCHGADD_ALGORITHM
34 config GENERIC_HWEIGHT
37 config ARCH_HAS_ILOG2_U32
40 config ARCH_HAS_ILOG2_U64
51 source "kernel/Kconfig.freezer"
53 config LOCKDEP_SUPPORT
56 config STACKTRACE_SUPPORT
59 config TRACE_IRQFLAGS_SUPPORT
65 config VARIANT_IRQ_SWITCH
68 config HAVE_XTENSA_GPIO32
74 menu "Processor type and features"
77 prompt "Xtensa Processor Configuration"
78 default XTENSA_VARIANT_FSF
80 config XTENSA_VARIANT_FSF
81 bool "fsf - default (not generic) configuration"
83 select HAVE_XTENSA_GPIO32
85 config XTENSA_VARIANT_DC232B
86 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
88 select HAVE_XTENSA_GPIO32
90 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
92 config XTENSA_VARIANT_DC233C
93 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
95 select HAVE_XTENSA_GPIO32
97 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
99 config XTENSA_VARIANT_S6000
100 bool "s6000 - Stretch software configurable processor"
101 select VARIANT_IRQ_SWITCH
102 select ARCH_REQUIRE_GPIOLIB
103 select XTENSA_CALIBRATE_CCOUNT
106 config XTENSA_UNALIGNED_USER
107 bool "Unaligned memory access in use space"
109 The Xtensa architecture currently does not handle unaligned
110 memory accesses in hardware but through an exception handler.
111 Per default, unaligned memory accesses are disabled in user space.
113 Say Y here to enable unaligned memory access in user space.
115 source "kernel/Kconfig.preempt"
118 bool "System Supports SMP (MX)"
119 depends on MAY_HAVE_SMP
122 This option is use to indicate that the system-on-a-chip (SOC)
123 supports Multiprocessing. Multiprocessor support implemented above
124 the CPU core definition and currently needs to be selected manually.
126 Multiprocessor support in implemented with external cache and
127 interrupt controlers.
129 The MX interrupt distributer adds Interprocessor Interrupts
130 and causes the IRQ numbers to be increased by 4 for devices
131 like the open cores ethernet driver and the serial interface.
133 You still have to select "Enable SMP" to enable SMP on this SOC.
136 bool "Enable Symmetric multi-processing support"
138 select USE_GENERIC_SMP_HELPERS
139 select GENERIC_SMP_IDLE_THREAD
141 Enabled SMP Software; allows more than one CPU/CORE
142 to be activated during startup.
146 int "Maximum number of CPUs (2-32)"
151 bool "Enable CPU hotplug support"
154 Say Y here to allow turning CPUs off and on. CPUs can be
155 controlled through /sys/devices/system/cpu.
157 Say N if you want to disable CPU hotplug.
159 config MATH_EMULATION
160 bool "Math emulation"
162 Can we use information of configuration file?
164 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
165 bool "Initialize Xtensa MMU inside the Linux kernel code"
168 Earlier version initialized the MMU in the exception vector
169 before jumping to _startup in head.S and had an advantage that
170 it was possible to place a software breakpoint at 'reset' and
171 then enter your normal kernel breakpoints once the MMU was mapped
172 to the kernel mappings (0XC0000000).
174 This unfortunately doesn't work for U-Boot and likley also wont
175 work for using KEXEC to have a hot kernel ready for doing a
178 So now the MMU is initialized in head.S but it's necessary to
179 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
180 xt-gdb can't place a Software Breakpoint in the 0XD region prior
181 to mapping the MMU and after mapping even if the area of low memory
182 was mapped gdb wouldn't remove the breakpoint on hitting it as the
183 PC wouldn't match. Since Hardware Breakpoints are recommended for
184 Linux configurations it seems reasonable to just assume they exist
185 and leave this older mechanism for unfortunate souls that choose
186 not to follow Tensilica's recommendation.
188 Selecting this will cause U-Boot to set the KERNEL Load and Entry
189 address at 0x00003000 instead of the mapped std of 0xD0003000.
195 config XTENSA_CALIBRATE_CCOUNT
198 On some platforms (XT2000, for example), the CPU clock rate can
199 vary. The frequency can be determined, however, by measuring
200 against a well known, fixed frequency, such as an UART oscillator.
202 config SERIAL_CONSOLE
211 Find out whether you have a PCI motherboard. PCI is the name of a
212 bus system, i.e. the way the CPU talks to the other stuff inside
213 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
214 VESA. If you have PCI, say Y, otherwise N.
216 source "drivers/pci/Kconfig"
220 menu "Platform options"
223 prompt "Xtensa System Type"
224 default XTENSA_PLATFORM_ISS
226 config XTENSA_PLATFORM_ISS
229 select XTENSA_CALIBRATE_CCOUNT
230 select SERIAL_CONSOLE
232 ISS is an acronym for Tensilica's Instruction Set Simulator.
234 config XTENSA_PLATFORM_XT2000
237 XT2000 is the name of Tensilica's feature-rich emulation platform.
238 This hardware is capable of running a full Linux distribution.
240 config XTENSA_PLATFORM_S6105
242 select SERIAL_CONSOLE
245 config XTENSA_PLATFORM_XTFPGA
247 select SERIAL_CONSOLE
249 select XTENSA_CALIBRATE_CCOUNT
251 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
252 This hardware is capable of running a full Linux distribution.
257 config XTENSA_CPU_CLOCK
258 int "CPU clock rate [MHz]"
259 depends on !XTENSA_CALIBRATE_CCOUNT
262 config GENERIC_CALIBRATE_DELAY
263 bool "Auto calibration of the BogoMIPS value"
265 The BogoMIPS value can easily be derived from the CPU frequency.
268 bool "Default bootloader kernel arguments"
271 string "Initial kernel command string"
272 depends on CMDLINE_BOOL
273 default "console=ttyS0,38400 root=/dev/ram"
275 On some architectures (EBSA110 and CATS), there is currently no way
276 for the boot loader to pass arguments to the kernel. For these
277 architectures, you should supply some command-line options at build
278 time by entering them here. As a minimum, you should specify the
279 memory size and the root device (e.g., mem=64M root=/dev/nfs).
282 bool "Flattened Device Tree support"
284 select OF_EARLY_FLATTREE
286 Include support for flattened device tree machine descriptions.
289 string "DTB to build into the kernel image"
292 config BLK_DEV_SIMDISK
293 tristate "Host file-based simulated block device support"
295 depends on XTENSA_PLATFORM_ISS
297 Create block devices that map to files in the host file system.
298 Device binding to host file may be changed at runtime via proc
299 interface provided the device is not in use.
301 config BLK_DEV_SIMDISK_COUNT
302 int "Number of host file-based simulated block devices"
304 depends on BLK_DEV_SIMDISK
307 This is the default minimal number of created block devices.
308 Kernel/module parameter 'simdisk_count' may be used to change this
309 value at runtime. More file names (but no more than 10) may be
310 specified as parameters, simdisk_count grows accordingly.
312 config SIMDISK0_FILENAME
313 string "Host filename for the first simulated device"
314 depends on BLK_DEV_SIMDISK = y
317 Attach a first simdisk to a host file. Conventionally, this file
318 contains a root file system.
320 config SIMDISK1_FILENAME
321 string "Host filename for the second simulated device"
322 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
325 Another simulated disk in a host file for a buildroot-independent
330 source "drivers/pcmcia/Kconfig"
332 source "drivers/pci/hotplug/Kconfig"
336 menu "Executable file formats"
338 source "fs/Kconfig.binfmt"
344 source "drivers/Kconfig"
348 source "arch/xtensa/Kconfig.debug"
350 source "security/Kconfig"
352 source "crypto/Kconfig"