1 # SPDX-License-Identifier: GPL-2.0
7 select ARCH_NO_COHERENT_DMA_MMAP if !MMU
8 select ARCH_WANT_FRAME_POINTERS
9 select ARCH_WANT_IPC_PARSE_VERSION
10 select BUILDTIME_EXTABLE_SORT
11 select CLONE_BACKWARDS
13 select GENERIC_ATOMIC64
14 select GENERIC_CLOCKEVENTS
15 select GENERIC_IRQ_SHOW
16 select GENERIC_PCI_IOMAP
17 select GENERIC_SCHED_CLOCK
18 select GENERIC_STRNCPY_FROM_USER if KASAN
19 select HAVE_ARCH_KASAN if MMU
20 select HAVE_CC_STACKPROTECTOR
21 select HAVE_DEBUG_KMEMLEAK
22 select HAVE_DMA_API_DEBUG
23 select HAVE_DMA_CONTIGUOUS
24 select HAVE_EXIT_THREAD
25 select HAVE_FUNCTION_TRACER
26 select HAVE_FUTEX_CMPXCHG if !MMU
27 select HAVE_HW_BREAKPOINT if PERF_EVENTS
28 select HAVE_IRQ_TIME_ACCOUNTING
31 select HAVE_PERF_EVENTS
33 select MODULES_USE_ELF_RELA
35 select PERF_USE_VMALLOC
38 Xtensa processors are 32-bit RISC machines designed by Tensilica
39 primarily for embedded systems. These processors are both
40 configurable and extensible. The Linux port to the Xtensa
41 architecture supports all processor configurations and extensions,
42 with reasonable minimum requirements. The Xtensa Linux project has
43 a home page at <http://www.linux-xtensa.org/>.
45 config RWSEM_XCHGADD_ALGORITHM
48 config GENERIC_HWEIGHT
51 config ARCH_HAS_ILOG2_U32
54 config ARCH_HAS_ILOG2_U64
65 source "kernel/Kconfig.freezer"
67 config LOCKDEP_SUPPORT
70 config STACKTRACE_SUPPORT
73 config TRACE_IRQFLAGS_SUPPORT
79 config VARIANT_IRQ_SWITCH
82 config HAVE_XTENSA_GPIO32
85 config KASAN_SHADOW_OFFSET
89 menu "Processor type and features"
92 prompt "Xtensa Processor Configuration"
93 default XTENSA_VARIANT_FSF
95 config XTENSA_VARIANT_FSF
96 bool "fsf - default (not generic) configuration"
99 config XTENSA_VARIANT_DC232B
100 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
102 select HAVE_XTENSA_GPIO32
104 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
106 config XTENSA_VARIANT_DC233C
107 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
109 select HAVE_XTENSA_GPIO32
111 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
113 config XTENSA_VARIANT_CUSTOM
114 bool "Custom Xtensa processor configuration"
115 select HAVE_XTENSA_GPIO32
117 Select this variant to use a custom Xtensa processor configuration.
118 You will be prompted for a processor variant CORENAME.
121 config XTENSA_VARIANT_CUSTOM_NAME
122 string "Xtensa Processor Custom Core Variant Name"
123 depends on XTENSA_VARIANT_CUSTOM
125 Provide the name of a custom Xtensa processor variant.
126 This CORENAME selects arch/xtensa/variant/CORENAME.
127 Dont forget you have to select MMU if you have one.
129 config XTENSA_VARIANT_NAME
131 default "dc232b" if XTENSA_VARIANT_DC232B
132 default "dc233c" if XTENSA_VARIANT_DC233C
133 default "fsf" if XTENSA_VARIANT_FSF
134 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
136 config XTENSA_VARIANT_MMU
137 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
138 depends on XTENSA_VARIANT_CUSTOM
142 Build a Conventional Kernel with full MMU support,
143 ie: it supports a TLB with auto-loading, page protection.
145 config XTENSA_VARIANT_HAVE_PERF_EVENTS
146 bool "Core variant has Performance Monitor Module"
147 depends on XTENSA_VARIANT_CUSTOM
150 Enable if core variant has Performance Monitor Module with
151 External Registers Interface.
155 config XTENSA_FAKE_NMI
156 bool "Treat PMM IRQ as NMI"
157 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS
160 If PMM IRQ is the only IRQ at EXCM level it is safe to
161 treat it as NMI, which improves accuracy of profiling.
163 If there are other interrupts at or above PMM IRQ priority level
164 but not above the EXCM level, PMM IRQ still may be treated as NMI,
165 but only if these IRQs are not used. There will be a build warning
166 saying that this is not safe, and a bugcheck if one of these IRQs
171 config XTENSA_UNALIGNED_USER
172 bool "Unaligned memory access in use space"
174 The Xtensa architecture currently does not handle unaligned
175 memory accesses in hardware but through an exception handler.
176 Per default, unaligned memory accesses are disabled in user space.
178 Say Y here to enable unaligned memory access in user space.
180 source "kernel/Kconfig.preempt"
183 bool "System Supports SMP (MX)"
184 depends on XTENSA_VARIANT_CUSTOM
187 This option is use to indicate that the system-on-a-chip (SOC)
188 supports Multiprocessing. Multiprocessor support implemented above
189 the CPU core definition and currently needs to be selected manually.
191 Multiprocessor support in implemented with external cache and
192 interrupt controllers.
194 The MX interrupt distributer adds Interprocessor Interrupts
195 and causes the IRQ numbers to be increased by 4 for devices
196 like the open cores ethernet driver and the serial interface.
198 You still have to select "Enable SMP" to enable SMP on this SOC.
201 bool "Enable Symmetric multi-processing support"
203 select GENERIC_SMP_IDLE_THREAD
205 Enabled SMP Software; allows more than one CPU/CORE
206 to be activated during startup.
210 int "Maximum number of CPUs (2-32)"
215 bool "Enable CPU hotplug support"
218 Say Y here to allow turning CPUs off and on. CPUs can be
219 controlled through /sys/devices/system/cpu.
221 Say N if you want to disable CPU hotplug.
223 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
224 bool "Initialize Xtensa MMU inside the Linux kernel code"
225 depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B
226 default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM
228 Earlier version initialized the MMU in the exception vector
229 before jumping to _startup in head.S and had an advantage that
230 it was possible to place a software breakpoint at 'reset' and
231 then enter your normal kernel breakpoints once the MMU was mapped
232 to the kernel mappings (0XC0000000).
234 This unfortunately won't work for U-Boot and likely also wont
235 work for using KEXEC to have a hot kernel ready for doing a
238 So now the MMU is initialized in head.S but it's necessary to
239 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
240 xt-gdb can't place a Software Breakpoint in the 0XD region prior
241 to mapping the MMU and after mapping even if the area of low memory
242 was mapped gdb wouldn't remove the breakpoint on hitting it as the
243 PC wouldn't match. Since Hardware Breakpoints are recommended for
244 Linux configurations it seems reasonable to just assume they exist
245 and leave this older mechanism for unfortunate souls that choose
246 not to follow Tensilica's recommendation.
248 Selecting this will cause U-Boot to set the KERNEL Load and Entry
249 address at 0x00003000 instead of the mapped std of 0xD0003000.
254 hex "Physical address of the KSEG mapping"
255 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
258 This is the physical address where KSEG is mapped. Please refer to
259 the chosen KSEG layout help for the required address alignment.
260 Unpacked kernel image (including vectors) must be located completely
262 Physical memory below this address is not available to linux.
264 If unsure, leave the default value here.
266 config KERNEL_LOAD_ADDRESS
267 hex "Kernel load address"
268 default 0x60003000 if !MMU
269 default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
270 default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
272 This is the address where the kernel is loaded.
273 It is virtual address for MMUv2 configurations and physical address
274 for all other configurations.
276 If unsure, leave the default value here.
278 config VECTORS_OFFSET
279 hex "Kernel vectors offset"
282 This is the offset of the kernel image from the relocatable vectors
285 If unsure, leave the default value here.
290 default XTENSA_KSEG_MMU_V2
292 config XTENSA_KSEG_MMU_V2
293 bool "MMUv2: 128MB cached + 128MB uncached"
295 MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
296 at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
298 KSEG_PADDR must be aligned to 128MB.
300 config XTENSA_KSEG_256M
301 bool "256MB cached + 256MB uncached"
302 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
304 TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
305 with cache and to 0xc0000000 without cache.
306 KSEG_PADDR must be aligned to 256MB.
308 config XTENSA_KSEG_512M
309 bool "512MB cached + 512MB uncached"
310 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
312 TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
313 with cache and to 0xc0000000 without cache.
314 KSEG_PADDR must be aligned to 256MB.
319 bool "High Memory Support"
322 Linux can use the full amount of RAM in the system by
323 default. However, the default MMUv2 setup only maps the
324 lowermost 128 MB of memory linearly to the areas starting
325 at 0xd0000000 (cached) and 0xd8000000 (uncached).
326 When there are more than 128 MB memory in the system not
327 all of it can be "permanently mapped" by the kernel.
328 The physical memory that's not permanently mapped is called
331 If you are compiling a kernel which will never run on a
332 machine with more than 128 MB total physical RAM, answer
337 config FAST_SYSCALL_XTENSA
338 bool "Enable fast atomic syscalls"
341 fast_syscall_xtensa is a syscall that can make atomic operations
342 on UP kernel when processor has no s32c1i support.
344 This syscall is deprecated. It may have issues when called with
345 invalid arguments. It is provided only for backwards compatibility.
346 Only enable it if your userspace software requires it.
350 config FAST_SYSCALL_SPILL_REGISTERS
351 bool "Enable spill registers syscall"
354 fast_syscall_spill_registers is a syscall that spills all active
355 register windows of a calling userspace task onto its stack.
357 This syscall is deprecated. It may have issues when called with
358 invalid arguments. It is provided only for backwards compatibility.
359 Only enable it if your userspace software requires it.
365 config XTENSA_CALIBRATE_CCOUNT
368 On some platforms (XT2000, for example), the CPU clock rate can
369 vary. The frequency can be determined, however, by measuring
370 against a well known, fixed frequency, such as an UART oscillator.
372 config SERIAL_CONSOLE
381 Find out whether you have a PCI motherboard. PCI is the name of a
382 bus system, i.e. the way the CPU talks to the other stuff inside
383 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
384 VESA. If you have PCI, say Y, otherwise N.
386 source "drivers/pci/Kconfig"
390 menu "Platform options"
393 prompt "Xtensa System Type"
394 default XTENSA_PLATFORM_ISS
396 config XTENSA_PLATFORM_ISS
398 select XTENSA_CALIBRATE_CCOUNT
399 select SERIAL_CONSOLE
401 ISS is an acronym for Tensilica's Instruction Set Simulator.
403 config XTENSA_PLATFORM_XT2000
407 XT2000 is the name of Tensilica's feature-rich emulation platform.
408 This hardware is capable of running a full Linux distribution.
410 config XTENSA_PLATFORM_XTFPGA
412 select ETHOC if ETHERNET
413 select PLATFORM_WANT_DEFAULT_MEM if !MMU
414 select SERIAL_CONSOLE
415 select XTENSA_CALIBRATE_CCOUNT
417 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
418 This hardware is capable of running a full Linux distribution.
423 config XTENSA_CPU_CLOCK
424 int "CPU clock rate [MHz]"
425 depends on !XTENSA_CALIBRATE_CCOUNT
428 config GENERIC_CALIBRATE_DELAY
429 bool "Auto calibration of the BogoMIPS value"
431 The BogoMIPS value can easily be derived from the CPU frequency.
434 bool "Default bootloader kernel arguments"
437 string "Initial kernel command string"
438 depends on CMDLINE_BOOL
439 default "console=ttyS0,38400 root=/dev/ram"
441 On some architectures (EBSA110 and CATS), there is currently no way
442 for the boot loader to pass arguments to the kernel. For these
443 architectures, you should supply some command-line options at build
444 time by entering them here. As a minimum, you should specify the
445 memory size and the root device (e.g., mem=64M root=/dev/nfs).
448 bool "Flattened Device Tree support"
450 select OF_EARLY_FLATTREE
451 select OF_RESERVED_MEM
453 Include support for flattened device tree machine descriptions.
456 string "DTB to build into the kernel image"
459 config BLK_DEV_SIMDISK
460 tristate "Host file-based simulated block device support"
462 depends on XTENSA_PLATFORM_ISS && BLOCK
464 Create block devices that map to files in the host file system.
465 Device binding to host file may be changed at runtime via proc
466 interface provided the device is not in use.
468 config BLK_DEV_SIMDISK_COUNT
469 int "Number of host file-based simulated block devices"
471 depends on BLK_DEV_SIMDISK
474 This is the default minimal number of created block devices.
475 Kernel/module parameter 'simdisk_count' may be used to change this
476 value at runtime. More file names (but no more than 10) may be
477 specified as parameters, simdisk_count grows accordingly.
479 config SIMDISK0_FILENAME
480 string "Host filename for the first simulated device"
481 depends on BLK_DEV_SIMDISK = y
484 Attach a first simdisk to a host file. Conventionally, this file
485 contains a root file system.
487 config SIMDISK1_FILENAME
488 string "Host filename for the second simulated device"
489 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
492 Another simulated disk in a host file for a buildroot-independent
497 config FORCE_MAX_ZONEORDER
498 int "Maximum zone order"
501 The kernel memory allocator divides physically contiguous memory
502 blocks into "zones", where each zone is a power of two number of
503 pages. This option selects the largest power of two that the kernel
504 keeps in the memory allocator. If you need to allocate very large
505 blocks of physically contiguous memory, then you may need to
508 This config option is actually maximum order plus one. For example,
509 a value of 11 means that the largest free memory block is 2^10 pages.
511 source "drivers/pcmcia/Kconfig"
513 config PLATFORM_WANT_DEFAULT_MEM
516 config DEFAULT_MEM_START
517 hex "Physical address of the default memory area start"
518 depends on PLATFORM_WANT_DEFAULT_MEM
519 default 0x00000000 if MMU
520 default 0x60000000 if !MMU
522 This is the base address of the default memory area.
523 Default memory area has platform-specific meaning, it may be used
524 for e.g. early cache initialization.
526 If unsure, leave the default value here.
528 config DEFAULT_MEM_SIZE
529 hex "Maximal size of the default memory area"
530 depends on PLATFORM_WANT_DEFAULT_MEM
533 This is the size of the default memory area.
534 Default memory area has platform-specific meaning, it may be used
535 for e.g. early cache initialization.
537 If unsure, leave the default value here.
540 bool "Enable XTFPGA LCD driver"
541 depends on XTENSA_PLATFORM_XTFPGA
544 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
545 progress messages there during bootup/shutdown. It may be useful
546 during board bringup.
550 config XTFPGA_LCD_BASE_ADDR
551 hex "XTFPGA LCD base address"
552 depends on XTFPGA_LCD
555 Base address of the LCD controller inside KIO region.
556 Different boards from XTFPGA family have LCD controller at different
557 addresses. Please consult prototyping user guide for your board for
558 the correct address. Wrong address here may lead to hardware lockup.
560 config XTFPGA_LCD_8BIT_ACCESS
561 bool "Use 8-bit access to XTFPGA LCD"
562 depends on XTFPGA_LCD
565 LCD may be connected with 4- or 8-bit interface, 8-bit access may
566 only be used with 8-bit interface. Please consult prototyping user
567 guide for your board for the correct interface width.
571 menu "Executable file formats"
573 source "fs/Kconfig.binfmt"
577 menu "Power management options"
579 source "kernel/power/Kconfig"
585 source "drivers/Kconfig"
589 source "arch/xtensa/Kconfig.debug"
591 source "security/Kconfig"
593 source "crypto/Kconfig"