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_CUSTOM
102 bool "Custom Xtensa processor configuration"
104 select HAVE_XTENSA_GPIO32
106 Select this variant to use a custom Xtensa processor configuration.
107 You will be prompted for a processor variant CORENAME.
110 config XTENSA_VARIANT_CUSTOM_NAME
111 string "Xtensa Processor Custom Core Variant Name"
112 depends on XTENSA_VARIANT_CUSTOM
114 Provide the name of a custom Xtensa processor variant.
115 This CORENAME selects arch/xtensa/variant/CORENAME.
116 Dont forget you have to select MMU if you have one.
118 config XTENSA_VARIANT_NAME
120 default "dc232b" if XTENSA_VARIANT_DC232B
121 default "dc233c" if XTENSA_VARIANT_DC233C
122 default "fsf" if XTENSA_VARIANT_FSF
123 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
125 config XTENSA_VARIANT_MMU
126 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
127 depends on XTENSA_VARIANT_CUSTOM
130 Build a Conventional Kernel with full MMU support,
131 ie: it supports a TLB with auto-loading, page protection.
133 config XTENSA_UNALIGNED_USER
134 bool "Unaligned memory access in use space"
136 The Xtensa architecture currently does not handle unaligned
137 memory accesses in hardware but through an exception handler.
138 Per default, unaligned memory accesses are disabled in user space.
140 Say Y here to enable unaligned memory access in user space.
142 source "kernel/Kconfig.preempt"
145 bool "System Supports SMP (MX)"
146 depends on MAY_HAVE_SMP
149 This option is use to indicate that the system-on-a-chip (SOC)
150 supports Multiprocessing. Multiprocessor support implemented above
151 the CPU core definition and currently needs to be selected manually.
153 Multiprocessor support in implemented with external cache and
154 interrupt controlers.
156 The MX interrupt distributer adds Interprocessor Interrupts
157 and causes the IRQ numbers to be increased by 4 for devices
158 like the open cores ethernet driver and the serial interface.
160 You still have to select "Enable SMP" to enable SMP on this SOC.
163 bool "Enable Symmetric multi-processing support"
165 select GENERIC_SMP_IDLE_THREAD
167 Enabled SMP Software; allows more than one CPU/CORE
168 to be activated during startup.
172 int "Maximum number of CPUs (2-32)"
177 bool "Enable CPU hotplug support"
180 Say Y here to allow turning CPUs off and on. CPUs can be
181 controlled through /sys/devices/system/cpu.
183 Say N if you want to disable CPU hotplug.
185 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
186 bool "Initialize Xtensa MMU inside the Linux kernel code"
189 Earlier version initialized the MMU in the exception vector
190 before jumping to _startup in head.S and had an advantage that
191 it was possible to place a software breakpoint at 'reset' and
192 then enter your normal kernel breakpoints once the MMU was mapped
193 to the kernel mappings (0XC0000000).
195 This unfortunately doesn't work for U-Boot and likley also wont
196 work for using KEXEC to have a hot kernel ready for doing a
199 So now the MMU is initialized in head.S but it's necessary to
200 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
201 xt-gdb can't place a Software Breakpoint in the 0XD region prior
202 to mapping the MMU and after mapping even if the area of low memory
203 was mapped gdb wouldn't remove the breakpoint on hitting it as the
204 PC wouldn't match. Since Hardware Breakpoints are recommended for
205 Linux configurations it seems reasonable to just assume they exist
206 and leave this older mechanism for unfortunate souls that choose
207 not to follow Tensilica's recommendation.
209 Selecting this will cause U-Boot to set the KERNEL Load and Entry
210 address at 0x00003000 instead of the mapped std of 0xD0003000.
215 bool "High Memory Support"
218 Linux can use the full amount of RAM in the system by
219 default. However, the default MMUv2 setup only maps the
220 lowermost 128 MB of memory linearly to the areas starting
221 at 0xd0000000 (cached) and 0xd8000000 (uncached).
222 When there are more than 128 MB memory in the system not
223 all of it can be "permanently mapped" by the kernel.
224 The physical memory that's not permanently mapped is called
227 If you are compiling a kernel which will never run on a
228 machine with more than 128 MB total physical RAM, answer
233 config FAST_SYSCALL_XTENSA
234 bool "Enable fast atomic syscalls"
237 fast_syscall_xtensa is a syscall that can make atomic operations
238 on UP kernel when processor has no s32c1i support.
240 This syscall is deprecated. It may have issues when called with
241 invalid arguments. It is provided only for backwards compatibility.
242 Only enable it if your userspace software requires it.
246 config FAST_SYSCALL_SPILL_REGISTERS
247 bool "Enable spill registers syscall"
250 fast_syscall_spill_registers is a syscall that spills all active
251 register windows of a calling userspace task onto its stack.
253 This syscall is deprecated. It may have issues when called with
254 invalid arguments. It is provided only for backwards compatibility.
255 Only enable it if your userspace software requires it.
261 config XTENSA_CALIBRATE_CCOUNT
264 On some platforms (XT2000, for example), the CPU clock rate can
265 vary. The frequency can be determined, however, by measuring
266 against a well known, fixed frequency, such as an UART oscillator.
268 config SERIAL_CONSOLE
277 Find out whether you have a PCI motherboard. PCI is the name of a
278 bus system, i.e. the way the CPU talks to the other stuff inside
279 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
280 VESA. If you have PCI, say Y, otherwise N.
282 source "drivers/pci/Kconfig"
286 menu "Platform options"
289 prompt "Xtensa System Type"
290 default XTENSA_PLATFORM_ISS
292 config XTENSA_PLATFORM_ISS
294 select XTENSA_CALIBRATE_CCOUNT
295 select SERIAL_CONSOLE
297 ISS is an acronym for Tensilica's Instruction Set Simulator.
299 config XTENSA_PLATFORM_XT2000
303 XT2000 is the name of Tensilica's feature-rich emulation platform.
304 This hardware is capable of running a full Linux distribution.
306 config XTENSA_PLATFORM_XTFPGA
308 select ETHOC if ETHERNET
309 select PLATFORM_WANT_DEFAULT_MEM
310 select SERIAL_CONSOLE
311 select XTENSA_CALIBRATE_CCOUNT
313 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
314 This hardware is capable of running a full Linux distribution.
319 config XTENSA_CPU_CLOCK
320 int "CPU clock rate [MHz]"
321 depends on !XTENSA_CALIBRATE_CCOUNT
324 config GENERIC_CALIBRATE_DELAY
325 bool "Auto calibration of the BogoMIPS value"
327 The BogoMIPS value can easily be derived from the CPU frequency.
330 bool "Default bootloader kernel arguments"
333 string "Initial kernel command string"
334 depends on CMDLINE_BOOL
335 default "console=ttyS0,38400 root=/dev/ram"
337 On some architectures (EBSA110 and CATS), there is currently no way
338 for the boot loader to pass arguments to the kernel. For these
339 architectures, you should supply some command-line options at build
340 time by entering them here. As a minimum, you should specify the
341 memory size and the root device (e.g., mem=64M root=/dev/nfs).
344 bool "Flattened Device Tree support"
346 select OF_EARLY_FLATTREE
348 Include support for flattened device tree machine descriptions.
351 string "DTB to build into the kernel image"
354 config BLK_DEV_SIMDISK
355 tristate "Host file-based simulated block device support"
357 depends on XTENSA_PLATFORM_ISS && BLOCK
359 Create block devices that map to files in the host file system.
360 Device binding to host file may be changed at runtime via proc
361 interface provided the device is not in use.
363 config BLK_DEV_SIMDISK_COUNT
364 int "Number of host file-based simulated block devices"
366 depends on BLK_DEV_SIMDISK
369 This is the default minimal number of created block devices.
370 Kernel/module parameter 'simdisk_count' may be used to change this
371 value at runtime. More file names (but no more than 10) may be
372 specified as parameters, simdisk_count grows accordingly.
374 config SIMDISK0_FILENAME
375 string "Host filename for the first simulated device"
376 depends on BLK_DEV_SIMDISK = y
379 Attach a first simdisk to a host file. Conventionally, this file
380 contains a root file system.
382 config SIMDISK1_FILENAME
383 string "Host filename for the second simulated device"
384 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
387 Another simulated disk in a host file for a buildroot-independent
392 source "drivers/pcmcia/Kconfig"
394 source "drivers/pci/hotplug/Kconfig"
396 config PLATFORM_WANT_DEFAULT_MEM
399 config DEFAULT_MEM_START
400 hex "Physical address of the default memory area start"
401 depends on PLATFORM_WANT_DEFAULT_MEM
402 default 0x00000000 if MMU
403 default 0x40000000 if !MMU
405 This is a fallback start address of the default memory area, it is
406 used when no physical memory size is passed through DTB or through
407 boot parameter from bootloader.
409 In noMMU configuration the following parameters are derived from it:
410 - kernel load address;
411 - kernel entry point address;
412 - relocatable vectors base address;
413 - uBoot load address;
416 If unsure, leave the default value here.
418 config DEFAULT_MEM_SIZE
419 hex "Maximal size of the default memory area"
420 depends on PLATFORM_WANT_DEFAULT_MEM
423 This is a fallback size of the default memory area, it is used when
424 no physical memory size is passed through DTB or through boot
425 parameter from bootloader.
427 It's also used for TASK_SIZE calculation in noMMU configuration.
429 If unsure, leave the default value here.
432 bool "Enable XTFPGA LCD driver"
433 depends on XTENSA_PLATFORM_XTFPGA
436 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
437 progress messages there during bootup/shutdown. It may be useful
438 during board bringup.
442 config XTFPGA_LCD_BASE_ADDR
443 hex "XTFPGA LCD base address"
444 depends on XTFPGA_LCD
447 Base address of the LCD controller inside KIO region.
448 Different boards from XTFPGA family have LCD controller at different
449 addresses. Please consult prototyping user guide for your board for
450 the correct address. Wrong address here may lead to hardware lockup.
452 config XTFPGA_LCD_8BIT_ACCESS
453 bool "Use 8-bit access to XTFPGA LCD"
454 depends on XTFPGA_LCD
457 LCD may be connected with 4- or 8-bit interface, 8-bit access may
458 only be used with 8-bit interface. Please consult prototyping user
459 guide for your board for the correct interface width.
463 menu "Executable file formats"
465 source "fs/Kconfig.binfmt"
469 menu "Power management options"
471 source "kernel/power/Kconfig"
477 source "drivers/Kconfig"
481 source "arch/xtensa/Kconfig.debug"
483 source "security/Kconfig"
485 source "crypto/Kconfig"