6 select ARCH_WANT_FRAME_POINTERS
7 select ARCH_WANT_IPC_PARSE_VERSION
8 select BUILDTIME_EXTABLE_SORT
11 select GENERIC_ATOMIC64
12 select GENERIC_CLOCKEVENTS
13 select GENERIC_IRQ_SHOW
14 select GENERIC_PCI_IOMAP
15 select GENERIC_SCHED_CLOCK
16 select HAVE_DMA_API_DEBUG
17 select HAVE_EXIT_THREAD
18 select HAVE_FUNCTION_TRACER
19 select HAVE_FUTEX_CMPXCHG if !MMU
20 select HAVE_HW_BREAKPOINT if PERF_EVENTS
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_FAKE_NMI
143 bool "Treat PMM IRQ as NMI"
144 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS
147 If PMM IRQ is the only IRQ at EXCM level it is safe to
148 treat it as NMI, which improves accuracy of profiling.
150 If there are other interrupts at or above PMM IRQ priority level
151 but not above the EXCM level, PMM IRQ still may be treated as NMI,
152 but only if these IRQs are not used. There will be a build warning
153 saying that this is not safe, and a bugcheck if one of these IRQs
158 config XTENSA_UNALIGNED_USER
159 bool "Unaligned memory access in use space"
161 The Xtensa architecture currently does not handle unaligned
162 memory accesses in hardware but through an exception handler.
163 Per default, unaligned memory accesses are disabled in user space.
165 Say Y here to enable unaligned memory access in user space.
167 source "kernel/Kconfig.preempt"
170 bool "System Supports SMP (MX)"
171 depends on XTENSA_VARIANT_CUSTOM
174 This option is use to indicate that the system-on-a-chip (SOC)
175 supports Multiprocessing. Multiprocessor support implemented above
176 the CPU core definition and currently needs to be selected manually.
178 Multiprocessor support in implemented with external cache and
179 interrupt controllers.
181 The MX interrupt distributer adds Interprocessor Interrupts
182 and causes the IRQ numbers to be increased by 4 for devices
183 like the open cores ethernet driver and the serial interface.
185 You still have to select "Enable SMP" to enable SMP on this SOC.
188 bool "Enable Symmetric multi-processing support"
190 select GENERIC_SMP_IDLE_THREAD
192 Enabled SMP Software; allows more than one CPU/CORE
193 to be activated during startup.
197 int "Maximum number of CPUs (2-32)"
202 bool "Enable CPU hotplug support"
205 Say Y here to allow turning CPUs off and on. CPUs can be
206 controlled through /sys/devices/system/cpu.
208 Say N if you want to disable CPU hotplug.
210 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
211 bool "Initialize Xtensa MMU inside the Linux kernel code"
214 Earlier version initialized the MMU in the exception vector
215 before jumping to _startup in head.S and had an advantage that
216 it was possible to place a software breakpoint at 'reset' and
217 then enter your normal kernel breakpoints once the MMU was mapped
218 to the kernel mappings (0XC0000000).
220 This unfortunately doesn't work for U-Boot and likley also wont
221 work for using KEXEC to have a hot kernel ready for doing a
224 So now the MMU is initialized in head.S but it's necessary to
225 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
226 xt-gdb can't place a Software Breakpoint in the 0XD region prior
227 to mapping the MMU and after mapping even if the area of low memory
228 was mapped gdb wouldn't remove the breakpoint on hitting it as the
229 PC wouldn't match. Since Hardware Breakpoints are recommended for
230 Linux configurations it seems reasonable to just assume they exist
231 and leave this older mechanism for unfortunate souls that choose
232 not to follow Tensilica's recommendation.
234 Selecting this will cause U-Boot to set the KERNEL Load and Entry
235 address at 0x00003000 instead of the mapped std of 0xD0003000.
240 bool "High Memory Support"
243 Linux can use the full amount of RAM in the system by
244 default. However, the default MMUv2 setup only maps the
245 lowermost 128 MB of memory linearly to the areas starting
246 at 0xd0000000 (cached) and 0xd8000000 (uncached).
247 When there are more than 128 MB memory in the system not
248 all of it can be "permanently mapped" by the kernel.
249 The physical memory that's not permanently mapped is called
252 If you are compiling a kernel which will never run on a
253 machine with more than 128 MB total physical RAM, answer
258 config FAST_SYSCALL_XTENSA
259 bool "Enable fast atomic syscalls"
262 fast_syscall_xtensa is a syscall that can make atomic operations
263 on UP kernel when processor has no s32c1i support.
265 This syscall is deprecated. It may have issues when called with
266 invalid arguments. It is provided only for backwards compatibility.
267 Only enable it if your userspace software requires it.
271 config FAST_SYSCALL_SPILL_REGISTERS
272 bool "Enable spill registers syscall"
275 fast_syscall_spill_registers is a syscall that spills all active
276 register windows of a calling userspace task onto its stack.
278 This syscall is deprecated. It may have issues when called with
279 invalid arguments. It is provided only for backwards compatibility.
280 Only enable it if your userspace software requires it.
286 config XTENSA_CALIBRATE_CCOUNT
289 On some platforms (XT2000, for example), the CPU clock rate can
290 vary. The frequency can be determined, however, by measuring
291 against a well known, fixed frequency, such as an UART oscillator.
293 config SERIAL_CONSOLE
302 Find out whether you have a PCI motherboard. PCI is the name of a
303 bus system, i.e. the way the CPU talks to the other stuff inside
304 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
305 VESA. If you have PCI, say Y, otherwise N.
307 source "drivers/pci/Kconfig"
311 menu "Platform options"
314 prompt "Xtensa System Type"
315 default XTENSA_PLATFORM_ISS
317 config XTENSA_PLATFORM_ISS
319 select XTENSA_CALIBRATE_CCOUNT
320 select SERIAL_CONSOLE
322 ISS is an acronym for Tensilica's Instruction Set Simulator.
324 config XTENSA_PLATFORM_XT2000
328 XT2000 is the name of Tensilica's feature-rich emulation platform.
329 This hardware is capable of running a full Linux distribution.
331 config XTENSA_PLATFORM_XTFPGA
333 select ETHOC if ETHERNET
334 select PLATFORM_WANT_DEFAULT_MEM
335 select SERIAL_CONSOLE
336 select XTENSA_CALIBRATE_CCOUNT
338 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
339 This hardware is capable of running a full Linux distribution.
344 config XTENSA_CPU_CLOCK
345 int "CPU clock rate [MHz]"
346 depends on !XTENSA_CALIBRATE_CCOUNT
349 config GENERIC_CALIBRATE_DELAY
350 bool "Auto calibration of the BogoMIPS value"
352 The BogoMIPS value can easily be derived from the CPU frequency.
355 bool "Default bootloader kernel arguments"
358 string "Initial kernel command string"
359 depends on CMDLINE_BOOL
360 default "console=ttyS0,38400 root=/dev/ram"
362 On some architectures (EBSA110 and CATS), there is currently no way
363 for the boot loader to pass arguments to the kernel. For these
364 architectures, you should supply some command-line options at build
365 time by entering them here. As a minimum, you should specify the
366 memory size and the root device (e.g., mem=64M root=/dev/nfs).
369 bool "Flattened Device Tree support"
371 select OF_EARLY_FLATTREE
373 Include support for flattened device tree machine descriptions.
376 string "DTB to build into the kernel image"
379 config BLK_DEV_SIMDISK
380 tristate "Host file-based simulated block device support"
382 depends on XTENSA_PLATFORM_ISS && BLOCK
384 Create block devices that map to files in the host file system.
385 Device binding to host file may be changed at runtime via proc
386 interface provided the device is not in use.
388 config BLK_DEV_SIMDISK_COUNT
389 int "Number of host file-based simulated block devices"
391 depends on BLK_DEV_SIMDISK
394 This is the default minimal number of created block devices.
395 Kernel/module parameter 'simdisk_count' may be used to change this
396 value at runtime. More file names (but no more than 10) may be
397 specified as parameters, simdisk_count grows accordingly.
399 config SIMDISK0_FILENAME
400 string "Host filename for the first simulated device"
401 depends on BLK_DEV_SIMDISK = y
404 Attach a first simdisk to a host file. Conventionally, this file
405 contains a root file system.
407 config SIMDISK1_FILENAME
408 string "Host filename for the second simulated device"
409 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
412 Another simulated disk in a host file for a buildroot-independent
417 config FORCE_MAX_ZONEORDER
418 int "Maximum zone order"
421 The kernel memory allocator divides physically contiguous memory
422 blocks into "zones", where each zone is a power of two number of
423 pages. This option selects the largest power of two that the kernel
424 keeps in the memory allocator. If you need to allocate very large
425 blocks of physically contiguous memory, then you may need to
428 This config option is actually maximum order plus one. For example,
429 a value of 11 means that the largest free memory block is 2^10 pages.
431 source "drivers/pcmcia/Kconfig"
433 config PLATFORM_WANT_DEFAULT_MEM
436 config DEFAULT_MEM_START
437 hex "Physical address of the default memory area start"
438 depends on PLATFORM_WANT_DEFAULT_MEM
439 default 0x00000000 if MMU
440 default 0x60000000 if !MMU
442 This is a fallback start address of the default memory area, it is
443 used when no physical memory size is passed through DTB or through
444 boot parameter from bootloader.
446 In noMMU configuration the following parameters are derived from it:
447 - kernel load address;
448 - kernel entry point address;
449 - relocatable vectors base address;
450 - uBoot load address;
453 If unsure, leave the default value here.
455 config DEFAULT_MEM_SIZE
456 hex "Maximal size of the default memory area"
457 depends on PLATFORM_WANT_DEFAULT_MEM
460 This is a fallback size of the default memory area, it is used when
461 no physical memory size is passed through DTB or through boot
462 parameter from bootloader.
464 It's also used for TASK_SIZE calculation in noMMU configuration.
466 If unsure, leave the default value here.
469 bool "Enable XTFPGA LCD driver"
470 depends on XTENSA_PLATFORM_XTFPGA
473 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
474 progress messages there during bootup/shutdown. It may be useful
475 during board bringup.
479 config XTFPGA_LCD_BASE_ADDR
480 hex "XTFPGA LCD base address"
481 depends on XTFPGA_LCD
484 Base address of the LCD controller inside KIO region.
485 Different boards from XTFPGA family have LCD controller at different
486 addresses. Please consult prototyping user guide for your board for
487 the correct address. Wrong address here may lead to hardware lockup.
489 config XTFPGA_LCD_8BIT_ACCESS
490 bool "Use 8-bit access to XTFPGA LCD"
491 depends on XTFPGA_LCD
494 LCD may be connected with 4- or 8-bit interface, 8-bit access may
495 only be used with 8-bit interface. Please consult prototyping user
496 guide for your board for the correct interface width.
500 menu "Executable file formats"
502 source "fs/Kconfig.binfmt"
506 menu "Power management options"
508 source "kernel/power/Kconfig"
514 source "drivers/Kconfig"
518 source "arch/xtensa/Kconfig.debug"
520 source "security/Kconfig"
522 source "crypto/Kconfig"