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_DMA_API_DEBUG
19 select HAVE_FUNCTION_TRACER
20 select HAVE_IRQ_TIME_ACCOUNTING
22 select HAVE_PERF_EVENTS
24 select MODULES_USE_ELF_RELA
25 select PERF_USE_VMALLOC
28 Xtensa processors are 32-bit RISC machines designed by Tensilica
29 primarily for embedded systems. These processors are both
30 configurable and extensible. The Linux port to the Xtensa
31 architecture supports all processor configurations and extensions,
32 with reasonable minimum requirements. The Xtensa Linux project has
33 a home page at <http://www.linux-xtensa.org/>.
35 config RWSEM_XCHGADD_ALGORITHM
38 config GENERIC_HWEIGHT
41 config ARCH_HAS_ILOG2_U32
44 config ARCH_HAS_ILOG2_U64
55 source "kernel/Kconfig.freezer"
57 config LOCKDEP_SUPPORT
60 config STACKTRACE_SUPPORT
63 config TRACE_IRQFLAGS_SUPPORT
69 config VARIANT_IRQ_SWITCH
72 config HAVE_XTENSA_GPIO32
75 menu "Processor type and features"
78 prompt "Xtensa Processor Configuration"
79 default XTENSA_VARIANT_FSF
81 config XTENSA_VARIANT_FSF
82 bool "fsf - default (not generic) configuration"
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_CUSTOM
100 bool "Custom Xtensa processor configuration"
101 select HAVE_XTENSA_GPIO32
103 Select this variant to use a custom Xtensa processor configuration.
104 You will be prompted for a processor variant CORENAME.
107 config XTENSA_VARIANT_CUSTOM_NAME
108 string "Xtensa Processor Custom Core Variant Name"
109 depends on XTENSA_VARIANT_CUSTOM
111 Provide the name of a custom Xtensa processor variant.
112 This CORENAME selects arch/xtensa/variant/CORENAME.
113 Dont forget you have to select MMU if you have one.
115 config XTENSA_VARIANT_NAME
117 default "dc232b" if XTENSA_VARIANT_DC232B
118 default "dc233c" if XTENSA_VARIANT_DC233C
119 default "fsf" if XTENSA_VARIANT_FSF
120 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
122 config XTENSA_VARIANT_MMU
123 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
124 depends on XTENSA_VARIANT_CUSTOM
128 Build a Conventional Kernel with full MMU support,
129 ie: it supports a TLB with auto-loading, page protection.
131 config XTENSA_VARIANT_HAVE_PERF_EVENTS
132 bool "Core variant has Performance Monitor Module"
133 depends on XTENSA_VARIANT_CUSTOM
136 Enable if core variant has Performance Monitor Module with
137 External Registers Interface.
141 config XTENSA_UNALIGNED_USER
142 bool "Unaligned memory access in use space"
144 The Xtensa architecture currently does not handle unaligned
145 memory accesses in hardware but through an exception handler.
146 Per default, unaligned memory accesses are disabled in user space.
148 Say Y here to enable unaligned memory access in user space.
150 source "kernel/Kconfig.preempt"
153 bool "System Supports SMP (MX)"
154 depends on XTENSA_VARIANT_CUSTOM
157 This option is use to indicate that the system-on-a-chip (SOC)
158 supports Multiprocessing. Multiprocessor support implemented above
159 the CPU core definition and currently needs to be selected manually.
161 Multiprocessor support in implemented with external cache and
162 interrupt controllers.
164 The MX interrupt distributer adds Interprocessor Interrupts
165 and causes the IRQ numbers to be increased by 4 for devices
166 like the open cores ethernet driver and the serial interface.
168 You still have to select "Enable SMP" to enable SMP on this SOC.
171 bool "Enable Symmetric multi-processing support"
173 select GENERIC_SMP_IDLE_THREAD
175 Enabled SMP Software; allows more than one CPU/CORE
176 to be activated during startup.
180 int "Maximum number of CPUs (2-32)"
185 bool "Enable CPU hotplug support"
188 Say Y here to allow turning CPUs off and on. CPUs can be
189 controlled through /sys/devices/system/cpu.
191 Say N if you want to disable CPU hotplug.
193 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
194 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_XTFPGA
316 select ETHOC if ETHERNET
317 select PLATFORM_WANT_DEFAULT_MEM
318 select SERIAL_CONSOLE
319 select XTENSA_CALIBRATE_CCOUNT
321 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
322 This hardware is capable of running a full Linux distribution.
327 config XTENSA_CPU_CLOCK
328 int "CPU clock rate [MHz]"
329 depends on !XTENSA_CALIBRATE_CCOUNT
332 config GENERIC_CALIBRATE_DELAY
333 bool "Auto calibration of the BogoMIPS value"
335 The BogoMIPS value can easily be derived from the CPU frequency.
338 bool "Default bootloader kernel arguments"
341 string "Initial kernel command string"
342 depends on CMDLINE_BOOL
343 default "console=ttyS0,38400 root=/dev/ram"
345 On some architectures (EBSA110 and CATS), there is currently no way
346 for the boot loader to pass arguments to the kernel. For these
347 architectures, you should supply some command-line options at build
348 time by entering them here. As a minimum, you should specify the
349 memory size and the root device (e.g., mem=64M root=/dev/nfs).
352 bool "Flattened Device Tree support"
354 select OF_EARLY_FLATTREE
356 Include support for flattened device tree machine descriptions.
359 string "DTB to build into the kernel image"
362 config BLK_DEV_SIMDISK
363 tristate "Host file-based simulated block device support"
365 depends on XTENSA_PLATFORM_ISS && BLOCK
367 Create block devices that map to files in the host file system.
368 Device binding to host file may be changed at runtime via proc
369 interface provided the device is not in use.
371 config BLK_DEV_SIMDISK_COUNT
372 int "Number of host file-based simulated block devices"
374 depends on BLK_DEV_SIMDISK
377 This is the default minimal number of created block devices.
378 Kernel/module parameter 'simdisk_count' may be used to change this
379 value at runtime. More file names (but no more than 10) may be
380 specified as parameters, simdisk_count grows accordingly.
382 config SIMDISK0_FILENAME
383 string "Host filename for the first simulated device"
384 depends on BLK_DEV_SIMDISK = y
387 Attach a first simdisk to a host file. Conventionally, this file
388 contains a root file system.
390 config SIMDISK1_FILENAME
391 string "Host filename for the second simulated device"
392 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
395 Another simulated disk in a host file for a buildroot-independent
400 source "drivers/pcmcia/Kconfig"
402 source "drivers/pci/hotplug/Kconfig"
404 config PLATFORM_WANT_DEFAULT_MEM
407 config DEFAULT_MEM_START
408 hex "Physical address of the default memory area start"
409 depends on PLATFORM_WANT_DEFAULT_MEM
410 default 0x00000000 if MMU
411 default 0x40000000 if !MMU
413 This is a fallback start address of the default memory area, it is
414 used when no physical memory size is passed through DTB or through
415 boot parameter from bootloader.
417 In noMMU configuration the following parameters are derived from it:
418 - kernel load address;
419 - kernel entry point address;
420 - relocatable vectors base address;
421 - uBoot load address;
424 If unsure, leave the default value here.
426 config DEFAULT_MEM_SIZE
427 hex "Maximal size of the default memory area"
428 depends on PLATFORM_WANT_DEFAULT_MEM
431 This is a fallback size of the default memory area, it is used when
432 no physical memory size is passed through DTB or through boot
433 parameter from bootloader.
435 It's also used for TASK_SIZE calculation in noMMU configuration.
437 If unsure, leave the default value here.
440 bool "Enable XTFPGA LCD driver"
441 depends on XTENSA_PLATFORM_XTFPGA
444 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
445 progress messages there during bootup/shutdown. It may be useful
446 during board bringup.
450 config XTFPGA_LCD_BASE_ADDR
451 hex "XTFPGA LCD base address"
452 depends on XTFPGA_LCD
455 Base address of the LCD controller inside KIO region.
456 Different boards from XTFPGA family have LCD controller at different
457 addresses. Please consult prototyping user guide for your board for
458 the correct address. Wrong address here may lead to hardware lockup.
460 config XTFPGA_LCD_8BIT_ACCESS
461 bool "Use 8-bit access to XTFPGA LCD"
462 depends on XTFPGA_LCD
465 LCD may be connected with 4- or 8-bit interface, 8-bit access may
466 only be used with 8-bit interface. Please consult prototyping user
467 guide for your board for the correct interface width.
471 menu "Executable file formats"
473 source "fs/Kconfig.binfmt"
477 menu "Power management options"
479 source "kernel/power/Kconfig"
485 source "drivers/Kconfig"
489 source "arch/xtensa/Kconfig.debug"
491 source "security/Kconfig"
493 source "crypto/Kconfig"