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_FUTEX_CMPXCHG if !MMU
21 select HAVE_IRQ_TIME_ACCOUNTING
23 select HAVE_PERF_EVENTS
25 select MODULES_USE_ELF_RELA
26 select PERF_USE_VMALLOC
29 Xtensa processors are 32-bit RISC machines designed by Tensilica
30 primarily for embedded systems. These processors are both
31 configurable and extensible. The Linux port to the Xtensa
32 architecture supports all processor configurations and extensions,
33 with reasonable minimum requirements. The Xtensa Linux project has
34 a home page at <http://www.linux-xtensa.org/>.
36 config RWSEM_XCHGADD_ALGORITHM
39 config GENERIC_HWEIGHT
42 config ARCH_HAS_ILOG2_U32
45 config ARCH_HAS_ILOG2_U64
56 source "kernel/Kconfig.freezer"
58 config LOCKDEP_SUPPORT
61 config STACKTRACE_SUPPORT
64 config TRACE_IRQFLAGS_SUPPORT
70 config VARIANT_IRQ_SWITCH
73 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_CUSTOM
101 bool "Custom Xtensa processor configuration"
102 select HAVE_XTENSA_GPIO32
104 Select this variant to use a custom Xtensa processor configuration.
105 You will be prompted for a processor variant CORENAME.
108 config XTENSA_VARIANT_CUSTOM_NAME
109 string "Xtensa Processor Custom Core Variant Name"
110 depends on XTENSA_VARIANT_CUSTOM
112 Provide the name of a custom Xtensa processor variant.
113 This CORENAME selects arch/xtensa/variant/CORENAME.
114 Dont forget you have to select MMU if you have one.
116 config XTENSA_VARIANT_NAME
118 default "dc232b" if XTENSA_VARIANT_DC232B
119 default "dc233c" if XTENSA_VARIANT_DC233C
120 default "fsf" if XTENSA_VARIANT_FSF
121 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
123 config XTENSA_VARIANT_MMU
124 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
125 depends on XTENSA_VARIANT_CUSTOM
129 Build a Conventional Kernel with full MMU support,
130 ie: it supports a TLB with auto-loading, page protection.
132 config XTENSA_VARIANT_HAVE_PERF_EVENTS
133 bool "Core variant has Performance Monitor Module"
134 depends on XTENSA_VARIANT_CUSTOM
137 Enable if core variant has Performance Monitor Module with
138 External Registers Interface.
142 config XTENSA_UNALIGNED_USER
143 bool "Unaligned memory access in use space"
145 The Xtensa architecture currently does not handle unaligned
146 memory accesses in hardware but through an exception handler.
147 Per default, unaligned memory accesses are disabled in user space.
149 Say Y here to enable unaligned memory access in user space.
151 source "kernel/Kconfig.preempt"
154 bool "System Supports SMP (MX)"
155 depends on XTENSA_VARIANT_CUSTOM
158 This option is use to indicate that the system-on-a-chip (SOC)
159 supports Multiprocessing. Multiprocessor support implemented above
160 the CPU core definition and currently needs to be selected manually.
162 Multiprocessor support in implemented with external cache and
163 interrupt controllers.
165 The MX interrupt distributer adds Interprocessor Interrupts
166 and causes the IRQ numbers to be increased by 4 for devices
167 like the open cores ethernet driver and the serial interface.
169 You still have to select "Enable SMP" to enable SMP on this SOC.
172 bool "Enable Symmetric multi-processing support"
174 select GENERIC_SMP_IDLE_THREAD
176 Enabled SMP Software; allows more than one CPU/CORE
177 to be activated during startup.
181 int "Maximum number of CPUs (2-32)"
186 bool "Enable CPU hotplug support"
189 Say Y here to allow turning CPUs off and on. CPUs can be
190 controlled through /sys/devices/system/cpu.
192 Say N if you want to disable CPU hotplug.
194 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
195 bool "Initialize Xtensa MMU inside the Linux kernel code"
198 Earlier version initialized the MMU in the exception vector
199 before jumping to _startup in head.S and had an advantage that
200 it was possible to place a software breakpoint at 'reset' and
201 then enter your normal kernel breakpoints once the MMU was mapped
202 to the kernel mappings (0XC0000000).
204 This unfortunately doesn't work for U-Boot and likley also wont
205 work for using KEXEC to have a hot kernel ready for doing a
208 So now the MMU is initialized in head.S but it's necessary to
209 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
210 xt-gdb can't place a Software Breakpoint in the 0XD region prior
211 to mapping the MMU and after mapping even if the area of low memory
212 was mapped gdb wouldn't remove the breakpoint on hitting it as the
213 PC wouldn't match. Since Hardware Breakpoints are recommended for
214 Linux configurations it seems reasonable to just assume they exist
215 and leave this older mechanism for unfortunate souls that choose
216 not to follow Tensilica's recommendation.
218 Selecting this will cause U-Boot to set the KERNEL Load and Entry
219 address at 0x00003000 instead of the mapped std of 0xD0003000.
224 bool "High Memory Support"
227 Linux can use the full amount of RAM in the system by
228 default. However, the default MMUv2 setup only maps the
229 lowermost 128 MB of memory linearly to the areas starting
230 at 0xd0000000 (cached) and 0xd8000000 (uncached).
231 When there are more than 128 MB memory in the system not
232 all of it can be "permanently mapped" by the kernel.
233 The physical memory that's not permanently mapped is called
236 If you are compiling a kernel which will never run on a
237 machine with more than 128 MB total physical RAM, answer
242 config FAST_SYSCALL_XTENSA
243 bool "Enable fast atomic syscalls"
246 fast_syscall_xtensa is a syscall that can make atomic operations
247 on UP kernel when processor has no s32c1i support.
249 This syscall is deprecated. It may have issues when called with
250 invalid arguments. It is provided only for backwards compatibility.
251 Only enable it if your userspace software requires it.
255 config FAST_SYSCALL_SPILL_REGISTERS
256 bool "Enable spill registers syscall"
259 fast_syscall_spill_registers is a syscall that spills all active
260 register windows of a calling userspace task onto its stack.
262 This syscall is deprecated. It may have issues when called with
263 invalid arguments. It is provided only for backwards compatibility.
264 Only enable it if your userspace software requires it.
270 config XTENSA_CALIBRATE_CCOUNT
273 On some platforms (XT2000, for example), the CPU clock rate can
274 vary. The frequency can be determined, however, by measuring
275 against a well known, fixed frequency, such as an UART oscillator.
277 config SERIAL_CONSOLE
286 Find out whether you have a PCI motherboard. PCI is the name of a
287 bus system, i.e. the way the CPU talks to the other stuff inside
288 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
289 VESA. If you have PCI, say Y, otherwise N.
291 source "drivers/pci/Kconfig"
295 menu "Platform options"
298 prompt "Xtensa System Type"
299 default XTENSA_PLATFORM_ISS
301 config XTENSA_PLATFORM_ISS
303 select XTENSA_CALIBRATE_CCOUNT
304 select SERIAL_CONSOLE
306 ISS is an acronym for Tensilica's Instruction Set Simulator.
308 config XTENSA_PLATFORM_XT2000
312 XT2000 is the name of Tensilica's feature-rich emulation platform.
313 This hardware is capable of running a full Linux distribution.
315 config XTENSA_PLATFORM_XTFPGA
317 select ETHOC if ETHERNET
318 select PLATFORM_WANT_DEFAULT_MEM
319 select SERIAL_CONSOLE
320 select XTENSA_CALIBRATE_CCOUNT
322 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
323 This hardware is capable of running a full Linux distribution.
328 config XTENSA_CPU_CLOCK
329 int "CPU clock rate [MHz]"
330 depends on !XTENSA_CALIBRATE_CCOUNT
333 config GENERIC_CALIBRATE_DELAY
334 bool "Auto calibration of the BogoMIPS value"
336 The BogoMIPS value can easily be derived from the CPU frequency.
339 bool "Default bootloader kernel arguments"
342 string "Initial kernel command string"
343 depends on CMDLINE_BOOL
344 default "console=ttyS0,38400 root=/dev/ram"
346 On some architectures (EBSA110 and CATS), there is currently no way
347 for the boot loader to pass arguments to the kernel. For these
348 architectures, you should supply some command-line options at build
349 time by entering them here. As a minimum, you should specify the
350 memory size and the root device (e.g., mem=64M root=/dev/nfs).
353 bool "Flattened Device Tree support"
355 select OF_EARLY_FLATTREE
357 Include support for flattened device tree machine descriptions.
360 string "DTB to build into the kernel image"
363 config BLK_DEV_SIMDISK
364 tristate "Host file-based simulated block device support"
366 depends on XTENSA_PLATFORM_ISS && BLOCK
368 Create block devices that map to files in the host file system.
369 Device binding to host file may be changed at runtime via proc
370 interface provided the device is not in use.
372 config BLK_DEV_SIMDISK_COUNT
373 int "Number of host file-based simulated block devices"
375 depends on BLK_DEV_SIMDISK
378 This is the default minimal number of created block devices.
379 Kernel/module parameter 'simdisk_count' may be used to change this
380 value at runtime. More file names (but no more than 10) may be
381 specified as parameters, simdisk_count grows accordingly.
383 config SIMDISK0_FILENAME
384 string "Host filename for the first simulated device"
385 depends on BLK_DEV_SIMDISK = y
388 Attach a first simdisk to a host file. Conventionally, this file
389 contains a root file system.
391 config SIMDISK1_FILENAME
392 string "Host filename for the second simulated device"
393 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
396 Another simulated disk in a host file for a buildroot-independent
401 config FORCE_MAX_ZONEORDER
402 int "Maximum zone order"
405 The kernel memory allocator divides physically contiguous memory
406 blocks into "zones", where each zone is a power of two number of
407 pages. This option selects the largest power of two that the kernel
408 keeps in the memory allocator. If you need to allocate very large
409 blocks of physically contiguous memory, then you may need to
412 This config option is actually maximum order plus one. For example,
413 a value of 11 means that the largest free memory block is 2^10 pages.
415 source "drivers/pcmcia/Kconfig"
417 source "drivers/pci/hotplug/Kconfig"
419 config PLATFORM_WANT_DEFAULT_MEM
422 config DEFAULT_MEM_START
423 hex "Physical address of the default memory area start"
424 depends on PLATFORM_WANT_DEFAULT_MEM
425 default 0x00000000 if MMU
426 default 0x60000000 if !MMU
428 This is a fallback start address of the default memory area, it is
429 used when no physical memory size is passed through DTB or through
430 boot parameter from bootloader.
432 In noMMU configuration the following parameters are derived from it:
433 - kernel load address;
434 - kernel entry point address;
435 - relocatable vectors base address;
436 - uBoot load address;
439 If unsure, leave the default value here.
441 config DEFAULT_MEM_SIZE
442 hex "Maximal size of the default memory area"
443 depends on PLATFORM_WANT_DEFAULT_MEM
446 This is a fallback size of the default memory area, it is used when
447 no physical memory size is passed through DTB or through boot
448 parameter from bootloader.
450 It's also used for TASK_SIZE calculation in noMMU configuration.
452 If unsure, leave the default value here.
455 bool "Enable XTFPGA LCD driver"
456 depends on XTENSA_PLATFORM_XTFPGA
459 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
460 progress messages there during bootup/shutdown. It may be useful
461 during board bringup.
465 config XTFPGA_LCD_BASE_ADDR
466 hex "XTFPGA LCD base address"
467 depends on XTFPGA_LCD
470 Base address of the LCD controller inside KIO region.
471 Different boards from XTFPGA family have LCD controller at different
472 addresses. Please consult prototyping user guide for your board for
473 the correct address. Wrong address here may lead to hardware lockup.
475 config XTFPGA_LCD_8BIT_ACCESS
476 bool "Use 8-bit access to XTFPGA LCD"
477 depends on XTFPGA_LCD
480 LCD may be connected with 4- or 8-bit interface, 8-bit access may
481 only be used with 8-bit interface. Please consult prototyping user
482 guide for your board for the correct interface width.
486 menu "Executable file formats"
488 source "fs/Kconfig.binfmt"
492 menu "Power management options"
494 source "kernel/power/Kconfig"
500 source "drivers/Kconfig"
504 source "arch/xtensa/Kconfig.debug"
506 source "security/Kconfig"
508 source "crypto/Kconfig"