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_UNALIGNED_USER
132 bool "Unaligned memory access in use space"
134 The Xtensa architecture currently does not handle unaligned
135 memory accesses in hardware but through an exception handler.
136 Per default, unaligned memory accesses are disabled in user space.
138 Say Y here to enable unaligned memory access in user space.
140 source "kernel/Kconfig.preempt"
143 bool "System Supports SMP (MX)"
144 depends on XTENSA_VARIANT_CUSTOM
147 This option is use to indicate that the system-on-a-chip (SOC)
148 supports Multiprocessing. Multiprocessor support implemented above
149 the CPU core definition and currently needs to be selected manually.
151 Multiprocessor support in implemented with external cache and
152 interrupt controllers.
154 The MX interrupt distributer adds Interprocessor Interrupts
155 and causes the IRQ numbers to be increased by 4 for devices
156 like the open cores ethernet driver and the serial interface.
158 You still have to select "Enable SMP" to enable SMP on this SOC.
161 bool "Enable Symmetric multi-processing support"
163 select GENERIC_SMP_IDLE_THREAD
165 Enabled SMP Software; allows more than one CPU/CORE
166 to be activated during startup.
170 int "Maximum number of CPUs (2-32)"
175 bool "Enable CPU hotplug support"
178 Say Y here to allow turning CPUs off and on. CPUs can be
179 controlled through /sys/devices/system/cpu.
181 Say N if you want to disable CPU hotplug.
183 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
184 bool "Initialize Xtensa MMU inside the Linux kernel code"
187 Earlier version initialized the MMU in the exception vector
188 before jumping to _startup in head.S and had an advantage that
189 it was possible to place a software breakpoint at 'reset' and
190 then enter your normal kernel breakpoints once the MMU was mapped
191 to the kernel mappings (0XC0000000).
193 This unfortunately doesn't work for U-Boot and likley also wont
194 work for using KEXEC to have a hot kernel ready for doing a
197 So now the MMU is initialized in head.S but it's necessary to
198 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
199 xt-gdb can't place a Software Breakpoint in the 0XD region prior
200 to mapping the MMU and after mapping even if the area of low memory
201 was mapped gdb wouldn't remove the breakpoint on hitting it as the
202 PC wouldn't match. Since Hardware Breakpoints are recommended for
203 Linux configurations it seems reasonable to just assume they exist
204 and leave this older mechanism for unfortunate souls that choose
205 not to follow Tensilica's recommendation.
207 Selecting this will cause U-Boot to set the KERNEL Load and Entry
208 address at 0x00003000 instead of the mapped std of 0xD0003000.
213 bool "High Memory Support"
216 Linux can use the full amount of RAM in the system by
217 default. However, the default MMUv2 setup only maps the
218 lowermost 128 MB of memory linearly to the areas starting
219 at 0xd0000000 (cached) and 0xd8000000 (uncached).
220 When there are more than 128 MB memory in the system not
221 all of it can be "permanently mapped" by the kernel.
222 The physical memory that's not permanently mapped is called
225 If you are compiling a kernel which will never run on a
226 machine with more than 128 MB total physical RAM, answer
231 config FAST_SYSCALL_XTENSA
232 bool "Enable fast atomic syscalls"
235 fast_syscall_xtensa is a syscall that can make atomic operations
236 on UP kernel when processor has no s32c1i support.
238 This syscall is deprecated. It may have issues when called with
239 invalid arguments. It is provided only for backwards compatibility.
240 Only enable it if your userspace software requires it.
244 config FAST_SYSCALL_SPILL_REGISTERS
245 bool "Enable spill registers syscall"
248 fast_syscall_spill_registers is a syscall that spills all active
249 register windows of a calling userspace task onto its stack.
251 This syscall is deprecated. It may have issues when called with
252 invalid arguments. It is provided only for backwards compatibility.
253 Only enable it if your userspace software requires it.
259 config XTENSA_CALIBRATE_CCOUNT
262 On some platforms (XT2000, for example), the CPU clock rate can
263 vary. The frequency can be determined, however, by measuring
264 against a well known, fixed frequency, such as an UART oscillator.
266 config SERIAL_CONSOLE
275 Find out whether you have a PCI motherboard. PCI is the name of a
276 bus system, i.e. the way the CPU talks to the other stuff inside
277 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
278 VESA. If you have PCI, say Y, otherwise N.
280 source "drivers/pci/Kconfig"
284 menu "Platform options"
287 prompt "Xtensa System Type"
288 default XTENSA_PLATFORM_ISS
290 config XTENSA_PLATFORM_ISS
292 select XTENSA_CALIBRATE_CCOUNT
293 select SERIAL_CONSOLE
295 ISS is an acronym for Tensilica's Instruction Set Simulator.
297 config XTENSA_PLATFORM_XT2000
301 XT2000 is the name of Tensilica's feature-rich emulation platform.
302 This hardware is capable of running a full Linux distribution.
304 config XTENSA_PLATFORM_XTFPGA
306 select ETHOC if ETHERNET
307 select PLATFORM_WANT_DEFAULT_MEM
308 select SERIAL_CONSOLE
309 select XTENSA_CALIBRATE_CCOUNT
311 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
312 This hardware is capable of running a full Linux distribution.
317 config XTENSA_CPU_CLOCK
318 int "CPU clock rate [MHz]"
319 depends on !XTENSA_CALIBRATE_CCOUNT
322 config GENERIC_CALIBRATE_DELAY
323 bool "Auto calibration of the BogoMIPS value"
325 The BogoMIPS value can easily be derived from the CPU frequency.
328 bool "Default bootloader kernel arguments"
331 string "Initial kernel command string"
332 depends on CMDLINE_BOOL
333 default "console=ttyS0,38400 root=/dev/ram"
335 On some architectures (EBSA110 and CATS), there is currently no way
336 for the boot loader to pass arguments to the kernel. For these
337 architectures, you should supply some command-line options at build
338 time by entering them here. As a minimum, you should specify the
339 memory size and the root device (e.g., mem=64M root=/dev/nfs).
342 bool "Flattened Device Tree support"
344 select OF_EARLY_FLATTREE
346 Include support for flattened device tree machine descriptions.
349 string "DTB to build into the kernel image"
352 config BLK_DEV_SIMDISK
353 tristate "Host file-based simulated block device support"
355 depends on XTENSA_PLATFORM_ISS && BLOCK
357 Create block devices that map to files in the host file system.
358 Device binding to host file may be changed at runtime via proc
359 interface provided the device is not in use.
361 config BLK_DEV_SIMDISK_COUNT
362 int "Number of host file-based simulated block devices"
364 depends on BLK_DEV_SIMDISK
367 This is the default minimal number of created block devices.
368 Kernel/module parameter 'simdisk_count' may be used to change this
369 value at runtime. More file names (but no more than 10) may be
370 specified as parameters, simdisk_count grows accordingly.
372 config SIMDISK0_FILENAME
373 string "Host filename for the first simulated device"
374 depends on BLK_DEV_SIMDISK = y
377 Attach a first simdisk to a host file. Conventionally, this file
378 contains a root file system.
380 config SIMDISK1_FILENAME
381 string "Host filename for the second simulated device"
382 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
385 Another simulated disk in a host file for a buildroot-independent
390 source "drivers/pcmcia/Kconfig"
392 source "drivers/pci/hotplug/Kconfig"
394 config PLATFORM_WANT_DEFAULT_MEM
397 config DEFAULT_MEM_START
398 hex "Physical address of the default memory area start"
399 depends on PLATFORM_WANT_DEFAULT_MEM
400 default 0x00000000 if MMU
401 default 0x40000000 if !MMU
403 This is a fallback start address of the default memory area, it is
404 used when no physical memory size is passed through DTB or through
405 boot parameter from bootloader.
407 In noMMU configuration the following parameters are derived from it:
408 - kernel load address;
409 - kernel entry point address;
410 - relocatable vectors base address;
411 - uBoot load address;
414 If unsure, leave the default value here.
416 config DEFAULT_MEM_SIZE
417 hex "Maximal size of the default memory area"
418 depends on PLATFORM_WANT_DEFAULT_MEM
421 This is a fallback size of the default memory area, it is used when
422 no physical memory size is passed through DTB or through boot
423 parameter from bootloader.
425 It's also used for TASK_SIZE calculation in noMMU configuration.
427 If unsure, leave the default value here.
430 bool "Enable XTFPGA LCD driver"
431 depends on XTENSA_PLATFORM_XTFPGA
434 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
435 progress messages there during bootup/shutdown. It may be useful
436 during board bringup.
440 config XTFPGA_LCD_BASE_ADDR
441 hex "XTFPGA LCD base address"
442 depends on XTFPGA_LCD
445 Base address of the LCD controller inside KIO region.
446 Different boards from XTFPGA family have LCD controller at different
447 addresses. Please consult prototyping user guide for your board for
448 the correct address. Wrong address here may lead to hardware lockup.
450 config XTFPGA_LCD_8BIT_ACCESS
451 bool "Use 8-bit access to XTFPGA LCD"
452 depends on XTFPGA_LCD
455 LCD may be connected with 4- or 8-bit interface, 8-bit access may
456 only be used with 8-bit interface. Please consult prototyping user
457 guide for your board for the correct interface width.
461 menu "Executable file formats"
463 source "fs/Kconfig.binfmt"
467 menu "Power management options"
469 source "kernel/power/Kconfig"
475 source "drivers/Kconfig"
479 source "arch/xtensa/Kconfig.debug"
481 source "security/Kconfig"
483 source "crypto/Kconfig"