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 BUILDTIME_EXTABLE_SORT
18 select CLONE_BACKWARDS
21 select HAVE_FUNCTION_TRACER
22 select HAVE_IRQ_TIME_ACCOUNTING
23 select HAVE_PERF_EVENTS
26 Xtensa processors are 32-bit RISC machines designed by Tensilica
27 primarily for embedded systems. These processors are both
28 configurable and extensible. The Linux port to the Xtensa
29 architecture supports all processor configurations and extensions,
30 with reasonable minimum requirements. The Xtensa Linux project has
31 a home page at <http://www.linux-xtensa.org/>.
33 config RWSEM_XCHGADD_ALGORITHM
36 config GENERIC_HWEIGHT
39 config ARCH_HAS_ILOG2_U32
42 config ARCH_HAS_ILOG2_U64
53 source "kernel/Kconfig.freezer"
55 config LOCKDEP_SUPPORT
58 config STACKTRACE_SUPPORT
61 config TRACE_IRQFLAGS_SUPPORT
67 config VARIANT_IRQ_SWITCH
70 config HAVE_XTENSA_GPIO32
76 menu "Processor type and features"
79 prompt "Xtensa Processor Configuration"
80 default XTENSA_VARIANT_FSF
82 config XTENSA_VARIANT_FSF
83 bool "fsf - default (not generic) configuration"
86 config XTENSA_VARIANT_DC232B
87 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
89 select HAVE_XTENSA_GPIO32
91 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
93 config XTENSA_VARIANT_DC233C
94 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
96 select HAVE_XTENSA_GPIO32
98 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
100 config XTENSA_VARIANT_S6000
101 bool "s6000 - Stretch software configurable processor"
102 select VARIANT_IRQ_SWITCH
103 select ARCH_REQUIRE_GPIOLIB
104 select XTENSA_CALIBRATE_CCOUNT
107 config XTENSA_UNALIGNED_USER
108 bool "Unaligned memory access in use space"
110 The Xtensa architecture currently does not handle unaligned
111 memory accesses in hardware but through an exception handler.
112 Per default, unaligned memory accesses are disabled in user space.
114 Say Y here to enable unaligned memory access in user space.
116 source "kernel/Kconfig.preempt"
119 bool "System Supports SMP (MX)"
120 depends on MAY_HAVE_SMP
123 This option is use to indicate that the system-on-a-chip (SOC)
124 supports Multiprocessing. Multiprocessor support implemented above
125 the CPU core definition and currently needs to be selected manually.
127 Multiprocessor support in implemented with external cache and
128 interrupt controlers.
130 The MX interrupt distributer adds Interprocessor Interrupts
131 and causes the IRQ numbers to be increased by 4 for devices
132 like the open cores ethernet driver and the serial interface.
134 You still have to select "Enable SMP" to enable SMP on this SOC.
137 bool "Enable Symmetric multi-processing support"
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.
194 bool "High Memory Support"
196 Linux can use the full amount of RAM in the system by
197 default. However, the default MMUv2 setup only maps the
198 lowermost 128 MB of memory linearly to the areas starting
199 at 0xd0000000 (cached) and 0xd8000000 (uncached).
200 When there are more than 128 MB memory in the system not
201 all of it can be "permanently mapped" by the kernel.
202 The physical memory that's not permanently mapped is called
205 If you are compiling a kernel which will never run on a
206 machine with more than 128 MB total physical RAM, answer
213 config XTENSA_CALIBRATE_CCOUNT
216 On some platforms (XT2000, for example), the CPU clock rate can
217 vary. The frequency can be determined, however, by measuring
218 against a well known, fixed frequency, such as an UART oscillator.
220 config SERIAL_CONSOLE
229 Find out whether you have a PCI motherboard. PCI is the name of a
230 bus system, i.e. the way the CPU talks to the other stuff inside
231 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
232 VESA. If you have PCI, say Y, otherwise N.
234 source "drivers/pci/Kconfig"
238 menu "Platform options"
241 prompt "Xtensa System Type"
242 default XTENSA_PLATFORM_ISS
244 config XTENSA_PLATFORM_ISS
246 select XTENSA_CALIBRATE_CCOUNT
247 select SERIAL_CONSOLE
249 ISS is an acronym for Tensilica's Instruction Set Simulator.
251 config XTENSA_PLATFORM_XT2000
254 XT2000 is the name of Tensilica's feature-rich emulation platform.
255 This hardware is capable of running a full Linux distribution.
257 config XTENSA_PLATFORM_S6105
259 select SERIAL_CONSOLE
262 config XTENSA_PLATFORM_XTFPGA
264 select SERIAL_CONSOLE
266 select XTENSA_CALIBRATE_CCOUNT
268 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
269 This hardware is capable of running a full Linux distribution.
274 config XTENSA_CPU_CLOCK
275 int "CPU clock rate [MHz]"
276 depends on !XTENSA_CALIBRATE_CCOUNT
279 config GENERIC_CALIBRATE_DELAY
280 bool "Auto calibration of the BogoMIPS value"
282 The BogoMIPS value can easily be derived from the CPU frequency.
285 bool "Default bootloader kernel arguments"
288 string "Initial kernel command string"
289 depends on CMDLINE_BOOL
290 default "console=ttyS0,38400 root=/dev/ram"
292 On some architectures (EBSA110 and CATS), there is currently no way
293 for the boot loader to pass arguments to the kernel. For these
294 architectures, you should supply some command-line options at build
295 time by entering them here. As a minimum, you should specify the
296 memory size and the root device (e.g., mem=64M root=/dev/nfs).
299 bool "Flattened Device Tree support"
301 select OF_EARLY_FLATTREE
303 Include support for flattened device tree machine descriptions.
306 string "DTB to build into the kernel image"
309 config BLK_DEV_SIMDISK
310 tristate "Host file-based simulated block device support"
312 depends on XTENSA_PLATFORM_ISS
314 Create block devices that map to files in the host file system.
315 Device binding to host file may be changed at runtime via proc
316 interface provided the device is not in use.
318 config BLK_DEV_SIMDISK_COUNT
319 int "Number of host file-based simulated block devices"
321 depends on BLK_DEV_SIMDISK
324 This is the default minimal number of created block devices.
325 Kernel/module parameter 'simdisk_count' may be used to change this
326 value at runtime. More file names (but no more than 10) may be
327 specified as parameters, simdisk_count grows accordingly.
329 config SIMDISK0_FILENAME
330 string "Host filename for the first simulated device"
331 depends on BLK_DEV_SIMDISK = y
334 Attach a first simdisk to a host file. Conventionally, this file
335 contains a root file system.
337 config SIMDISK1_FILENAME
338 string "Host filename for the second simulated device"
339 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
342 Another simulated disk in a host file for a buildroot-independent
347 source "drivers/pcmcia/Kconfig"
349 source "drivers/pci/hotplug/Kconfig"
352 bool "Enable XTFPGA LCD driver"
353 depends on XTENSA_PLATFORM_XTFPGA
356 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
357 progress messages there during bootup/shutdown. It may be useful
358 during board bringup.
362 config XTFPGA_LCD_BASE_ADDR
363 hex "XTFPGA LCD base address"
364 depends on XTFPGA_LCD
367 Base address of the LCD controller inside KIO region.
368 Different boards from XTFPGA family have LCD controller at different
369 addresses. Please consult prototyping user guide for your board for
370 the correct address. Wrong address here may lead to hardware lockup.
372 config XTFPGA_LCD_8BIT_ACCESS
373 bool "Use 8-bit access to XTFPGA LCD"
374 depends on XTFPGA_LCD
377 LCD may be connected with 4- or 8-bit interface, 8-bit access may
378 only be used with 8-bit interface. Please consult prototyping user
379 guide for your board for the correct interface width.
383 menu "Executable file formats"
385 source "fs/Kconfig.binfmt"
391 source "drivers/Kconfig"
395 source "arch/xtensa/Kconfig.debug"
397 source "security/Kconfig"
399 source "crypto/Kconfig"