6 select ARCH_WANT_FRAME_POINTERS
7 select ARCH_WANT_IPC_PARSE_VERSION
8 select ARCH_WANT_OPTIONAL_GPIOLIB
9 select BUILDTIME_EXTABLE_SORT
10 select CLONE_BACKWARDS
12 select GENERIC_ATOMIC64
13 select GENERIC_CLOCKEVENTS
14 select GENERIC_IRQ_SHOW
15 select GENERIC_PCI_IOMAP
16 select GENERIC_SCHED_CLOCK
17 select HAVE_FUNCTION_TRACER
18 select HAVE_IRQ_TIME_ACCOUNTING
20 select HAVE_PERF_EVENTS
22 select MODULES_USE_ELF_RELA
25 Xtensa processors are 32-bit RISC machines designed by Tensilica
26 primarily for embedded systems. These processors are both
27 configurable and extensible. The Linux port to the Xtensa
28 architecture supports all processor configurations and extensions,
29 with reasonable minimum requirements. The Xtensa Linux project has
30 a home page at <http://www.linux-xtensa.org/>.
32 config RWSEM_XCHGADD_ALGORITHM
35 config GENERIC_HWEIGHT
38 config ARCH_HAS_ILOG2_U32
41 config ARCH_HAS_ILOG2_U64
52 source "kernel/Kconfig.freezer"
54 config LOCKDEP_SUPPORT
57 config STACKTRACE_SUPPORT
60 config TRACE_IRQFLAGS_SUPPORT
65 default n if !XTENSA_VARIANT_CUSTOM
66 default XTENSA_VARIANT_MMU if XTENSA_VARIANT_CUSTOM
68 config VARIANT_IRQ_SWITCH
71 config HAVE_XTENSA_GPIO32
77 menu "Processor type and features"
80 prompt "Xtensa Processor Configuration"
81 default XTENSA_VARIANT_FSF
83 config XTENSA_VARIANT_FSF
84 bool "fsf - default (not generic) configuration"
87 config XTENSA_VARIANT_DC232B
88 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
90 select HAVE_XTENSA_GPIO32
92 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
94 config XTENSA_VARIANT_DC233C
95 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
97 select HAVE_XTENSA_GPIO32
99 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
101 config XTENSA_VARIANT_S6000
102 bool "s6000 - Stretch software configurable processor"
103 select VARIANT_IRQ_SWITCH
104 select ARCH_REQUIRE_GPIOLIB
105 select XTENSA_CALIBRATE_CCOUNT
107 config XTENSA_VARIANT_CUSTOM
108 bool "Custom Xtensa processor configuration"
110 select HAVE_XTENSA_GPIO32
112 Select this variant to use a custom Xtensa processor configuration.
113 You will be prompted for a processor variant CORENAME.
116 config XTENSA_VARIANT_CUSTOM_NAME
117 string "Xtensa Processor Custom Core Variant Name"
118 depends on XTENSA_VARIANT_CUSTOM
120 Provide the name of a custom Xtensa processor variant.
121 This CORENAME selects arch/xtensa/variant/CORENAME.
122 Dont forget you have to select MMU if you have one.
124 config XTENSA_VARIANT_NAME
126 default "dc232b" if XTENSA_VARIANT_DC232B
127 default "dc233c" if XTENSA_VARIANT_DC233C
128 default "fsf" if XTENSA_VARIANT_FSF
129 default "s6000" if XTENSA_VARIANT_S6000
130 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
132 config XTENSA_VARIANT_MMU
133 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
134 depends on XTENSA_VARIANT_CUSTOM
137 Build a Conventional Kernel with full MMU support,
138 ie: it supports a TLB with auto-loading, page protection.
140 config XTENSA_UNALIGNED_USER
141 bool "Unaligned memory access in use space"
143 The Xtensa architecture currently does not handle unaligned
144 memory accesses in hardware but through an exception handler.
145 Per default, unaligned memory accesses are disabled in user space.
147 Say Y here to enable unaligned memory access in user space.
149 source "kernel/Kconfig.preempt"
152 bool "System Supports SMP (MX)"
153 depends on MAY_HAVE_SMP
156 This option is use to indicate that the system-on-a-chip (SOC)
157 supports Multiprocessing. Multiprocessor support implemented above
158 the CPU core definition and currently needs to be selected manually.
160 Multiprocessor support in implemented with external cache and
161 interrupt controlers.
163 The MX interrupt distributer adds Interprocessor Interrupts
164 and causes the IRQ numbers to be increased by 4 for devices
165 like the open cores ethernet driver and the serial interface.
167 You still have to select "Enable SMP" to enable SMP on this SOC.
170 bool "Enable Symmetric multi-processing support"
172 select GENERIC_SMP_IDLE_THREAD
174 Enabled SMP Software; allows more than one CPU/CORE
175 to be activated during startup.
179 int "Maximum number of CPUs (2-32)"
184 bool "Enable CPU hotplug support"
187 Say Y here to allow turning CPUs off and on. CPUs can be
188 controlled through /sys/devices/system/cpu.
190 Say N if you want to disable CPU hotplug.
192 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
193 bool "Initialize Xtensa MMU inside the Linux kernel code"
197 Earlier version initialized the MMU in the exception vector
198 before jumping to _startup in head.S and had an advantage that
199 it was possible to place a software breakpoint at 'reset' and
200 then enter your normal kernel breakpoints once the MMU was mapped
201 to the kernel mappings (0XC0000000).
203 This unfortunately doesn't work for U-Boot and likley also wont
204 work for using KEXEC to have a hot kernel ready for doing a
207 So now the MMU is initialized in head.S but it's necessary to
208 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
209 xt-gdb can't place a Software Breakpoint in the 0XD region prior
210 to mapping the MMU and after mapping even if the area of low memory
211 was mapped gdb wouldn't remove the breakpoint on hitting it as the
212 PC wouldn't match. Since Hardware Breakpoints are recommended for
213 Linux configurations it seems reasonable to just assume they exist
214 and leave this older mechanism for unfortunate souls that choose
215 not to follow Tensilica's recommendation.
217 Selecting this will cause U-Boot to set the KERNEL Load and Entry
218 address at 0x00003000 instead of the mapped std of 0xD0003000.
223 bool "High Memory Support"
226 Linux can use the full amount of RAM in the system by
227 default. However, the default MMUv2 setup only maps the
228 lowermost 128 MB of memory linearly to the areas starting
229 at 0xd0000000 (cached) and 0xd8000000 (uncached).
230 When there are more than 128 MB memory in the system not
231 all of it can be "permanently mapped" by the kernel.
232 The physical memory that's not permanently mapped is called
235 If you are compiling a kernel which will never run on a
236 machine with more than 128 MB total physical RAM, answer
241 config FAST_SYSCALL_XTENSA
242 bool "Enable fast atomic syscalls"
245 fast_syscall_xtensa is a syscall that can make atomic operations
246 on UP kernel when processor has no s32c1i support.
248 This syscall is deprecated. It may have issues when called with
249 invalid arguments. It is provided only for backwards compatibility.
250 Only enable it if your userspace software requires it.
254 config FAST_SYSCALL_SPILL_REGISTERS
255 bool "Enable spill registers syscall"
258 fast_syscall_spill_registers is a syscall that spills all active
259 register windows of a calling userspace task onto its stack.
261 This syscall is deprecated. It may have issues when called with
262 invalid arguments. It is provided only for backwards compatibility.
263 Only enable it if your userspace software requires it.
269 config XTENSA_CALIBRATE_CCOUNT
272 On some platforms (XT2000, for example), the CPU clock rate can
273 vary. The frequency can be determined, however, by measuring
274 against a well known, fixed frequency, such as an UART oscillator.
276 config SERIAL_CONSOLE
285 Find out whether you have a PCI motherboard. PCI is the name of a
286 bus system, i.e. the way the CPU talks to the other stuff inside
287 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
288 VESA. If you have PCI, say Y, otherwise N.
290 source "drivers/pci/Kconfig"
294 menu "Platform options"
297 prompt "Xtensa System Type"
298 default XTENSA_PLATFORM_ISS
300 config XTENSA_PLATFORM_ISS
302 select XTENSA_CALIBRATE_CCOUNT
303 select SERIAL_CONSOLE
305 ISS is an acronym for Tensilica's Instruction Set Simulator.
307 config XTENSA_PLATFORM_XT2000
311 XT2000 is the name of Tensilica's feature-rich emulation platform.
312 This hardware is capable of running a full Linux distribution.
314 config XTENSA_PLATFORM_S6105
317 select SERIAL_CONSOLE
320 config XTENSA_PLATFORM_XTFPGA
322 select SERIAL_CONSOLE
324 select XTENSA_CALIBRATE_CCOUNT
326 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
327 This hardware is capable of running a full Linux distribution.
332 config XTENSA_CPU_CLOCK
333 int "CPU clock rate [MHz]"
334 depends on !XTENSA_CALIBRATE_CCOUNT
337 config GENERIC_CALIBRATE_DELAY
338 bool "Auto calibration of the BogoMIPS value"
340 The BogoMIPS value can easily be derived from the CPU frequency.
343 bool "Default bootloader kernel arguments"
346 string "Initial kernel command string"
347 depends on CMDLINE_BOOL
348 default "console=ttyS0,38400 root=/dev/ram"
350 On some architectures (EBSA110 and CATS), there is currently no way
351 for the boot loader to pass arguments to the kernel. For these
352 architectures, you should supply some command-line options at build
353 time by entering them here. As a minimum, you should specify the
354 memory size and the root device (e.g., mem=64M root=/dev/nfs).
357 bool "Flattened Device Tree support"
359 select OF_EARLY_FLATTREE
361 Include support for flattened device tree machine descriptions.
364 string "DTB to build into the kernel image"
367 config BLK_DEV_SIMDISK
368 tristate "Host file-based simulated block device support"
370 depends on XTENSA_PLATFORM_ISS
372 Create block devices that map to files in the host file system.
373 Device binding to host file may be changed at runtime via proc
374 interface provided the device is not in use.
376 config BLK_DEV_SIMDISK_COUNT
377 int "Number of host file-based simulated block devices"
379 depends on BLK_DEV_SIMDISK
382 This is the default minimal number of created block devices.
383 Kernel/module parameter 'simdisk_count' may be used to change this
384 value at runtime. More file names (but no more than 10) may be
385 specified as parameters, simdisk_count grows accordingly.
387 config SIMDISK0_FILENAME
388 string "Host filename for the first simulated device"
389 depends on BLK_DEV_SIMDISK = y
392 Attach a first simdisk to a host file. Conventionally, this file
393 contains a root file system.
395 config SIMDISK1_FILENAME
396 string "Host filename for the second simulated device"
397 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
400 Another simulated disk in a host file for a buildroot-independent
405 source "drivers/pcmcia/Kconfig"
407 source "drivers/pci/hotplug/Kconfig"
411 menu "Executable file formats"
413 source "fs/Kconfig.binfmt"
419 source "drivers/Kconfig"
423 source "arch/xtensa/Kconfig.debug"
425 source "security/Kconfig"
427 source "crypto/Kconfig"