1 # SPDX-License-Identifier: GPL-2.0
4 select ARCH_32BIT_OFF_T
5 select ARCH_HAS_SYNC_DMA_FOR_CPU
6 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
7 select ARCH_NO_COHERENT_DMA_MMAP if !MMU
8 select ARCH_USE_QUEUED_RWLOCKS
9 select ARCH_USE_QUEUED_SPINLOCKS
10 select ARCH_WANT_FRAME_POINTERS
11 select ARCH_WANT_IPC_PARSE_VERSION
12 select BUILDTIME_EXTABLE_SORT
13 select CLONE_BACKWARDS
15 select DMA_REMAP if MMU
16 select GENERIC_ATOMIC64
17 select GENERIC_CLOCKEVENTS
18 select GENERIC_IRQ_SHOW
19 select GENERIC_PCI_IOMAP
20 select GENERIC_SCHED_CLOCK
21 select GENERIC_STRNCPY_FROM_USER if KASAN
22 select HAVE_ARCH_JUMP_LABEL
23 select HAVE_ARCH_KASAN if MMU
24 select HAVE_ARCH_TRACEHOOK
25 select HAVE_DEBUG_KMEMLEAK
26 select HAVE_DMA_CONTIGUOUS
27 select HAVE_EXIT_THREAD
28 select HAVE_FUNCTION_TRACER
29 select HAVE_FUTEX_CMPXCHG if !MMU
30 select HAVE_HW_BREAKPOINT if PERF_EVENTS
31 select HAVE_IRQ_TIME_ACCOUNTING
34 select HAVE_PERF_EVENTS
35 select HAVE_STACKPROTECTOR
36 select HAVE_SYSCALL_TRACEPOINTS
38 select MODULES_USE_ELF_RELA
39 select PERF_USE_VMALLOC
42 Xtensa processors are 32-bit RISC machines designed by Tensilica
43 primarily for embedded systems. These processors are both
44 configurable and extensible. The Linux port to the Xtensa
45 architecture supports all processor configurations and extensions,
46 with reasonable minimum requirements. The Xtensa Linux project has
47 a home page at <http://www.linux-xtensa.org/>.
49 config GENERIC_HWEIGHT
52 config ARCH_HAS_ILOG2_U32
55 config ARCH_HAS_ILOG2_U64
65 config LOCKDEP_SUPPORT
68 config STACKTRACE_SUPPORT
71 config TRACE_IRQFLAGS_SUPPORT
77 config HAVE_XTENSA_GPIO32
80 config KASAN_SHADOW_OFFSET
84 menu "Processor type and features"
87 prompt "Xtensa Processor Configuration"
88 default XTENSA_VARIANT_FSF
90 config XTENSA_VARIANT_FSF
91 bool "fsf - default (not generic) configuration"
94 config XTENSA_VARIANT_DC232B
95 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
97 select HAVE_XTENSA_GPIO32
99 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
101 config XTENSA_VARIANT_DC233C
102 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
104 select HAVE_XTENSA_GPIO32
106 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
108 config XTENSA_VARIANT_CUSTOM
109 bool "Custom Xtensa processor configuration"
110 select HAVE_XTENSA_GPIO32
112 Select this variant to use a custom Xtensa processor configuration.
113 You will be prompted for a processor variant CORENAME.
116 config XTENSA_VARIANT_CUSTOM_NAME
117 string "Xtensa Processor Custom Core Variant Name"
118 depends on XTENSA_VARIANT_CUSTOM
120 Provide the name of a custom Xtensa processor variant.
121 This CORENAME selects arch/xtensa/variant/CORENAME.
122 Dont forget you have to select MMU if you have one.
124 config XTENSA_VARIANT_NAME
126 default "dc232b" if XTENSA_VARIANT_DC232B
127 default "dc233c" if XTENSA_VARIANT_DC233C
128 default "fsf" if XTENSA_VARIANT_FSF
129 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
131 config XTENSA_VARIANT_MMU
132 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
133 depends on XTENSA_VARIANT_CUSTOM
137 Build a Conventional Kernel with full MMU support,
138 ie: it supports a TLB with auto-loading, page protection.
140 config XTENSA_VARIANT_HAVE_PERF_EVENTS
141 bool "Core variant has Performance Monitor Module"
142 depends on XTENSA_VARIANT_CUSTOM
145 Enable if core variant has Performance Monitor Module with
146 External Registers Interface.
150 config XTENSA_FAKE_NMI
151 bool "Treat PMM IRQ as NMI"
152 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS
155 If PMM IRQ is the only IRQ at EXCM level it is safe to
156 treat it as NMI, which improves accuracy of profiling.
158 If there are other interrupts at or above PMM IRQ priority level
159 but not above the EXCM level, PMM IRQ still may be treated as NMI,
160 but only if these IRQs are not used. There will be a build warning
161 saying that this is not safe, and a bugcheck if one of these IRQs
166 config XTENSA_UNALIGNED_USER
167 bool "Unaligned memory access in user space"
169 The Xtensa architecture currently does not handle unaligned
170 memory accesses in hardware but through an exception handler.
171 Per default, unaligned memory accesses are disabled in user space.
173 Say Y here to enable unaligned memory access in user space.
176 bool "System Supports SMP (MX)"
177 depends on XTENSA_VARIANT_CUSTOM
180 This option is use to indicate that the system-on-a-chip (SOC)
181 supports Multiprocessing. Multiprocessor support implemented above
182 the CPU core definition and currently needs to be selected manually.
184 Multiprocessor support in implemented with external cache and
185 interrupt controllers.
187 The MX interrupt distributer adds Interprocessor Interrupts
188 and causes the IRQ numbers to be increased by 4 for devices
189 like the open cores ethernet driver and the serial interface.
191 You still have to select "Enable SMP" to enable SMP on this SOC.
194 bool "Enable Symmetric multi-processing support"
196 select GENERIC_SMP_IDLE_THREAD
198 Enabled SMP Software; allows more than one CPU/CORE
199 to be activated during startup.
203 int "Maximum number of CPUs (2-32)"
208 bool "Enable CPU hotplug support"
211 Say Y here to allow turning CPUs off and on. CPUs can be
212 controlled through /sys/devices/system/cpu.
214 Say N if you want to disable CPU hotplug.
216 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
217 bool "Initialize Xtensa MMU inside the Linux kernel code"
218 depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B
219 default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM
221 Earlier version initialized the MMU in the exception vector
222 before jumping to _startup in head.S and had an advantage that
223 it was possible to place a software breakpoint at 'reset' and
224 then enter your normal kernel breakpoints once the MMU was mapped
225 to the kernel mappings (0XC0000000).
227 This unfortunately won't work for U-Boot and likely also wont
228 work for using KEXEC to have a hot kernel ready for doing a
231 So now the MMU is initialized in head.S but it's necessary to
232 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
233 xt-gdb can't place a Software Breakpoint in the 0XD region prior
234 to mapping the MMU and after mapping even if the area of low memory
235 was mapped gdb wouldn't remove the breakpoint on hitting it as the
236 PC wouldn't match. Since Hardware Breakpoints are recommended for
237 Linux configurations it seems reasonable to just assume they exist
238 and leave this older mechanism for unfortunate souls that choose
239 not to follow Tensilica's recommendation.
241 Selecting this will cause U-Boot to set the KERNEL Load and Entry
242 address at 0x00003000 instead of the mapped std of 0xD0003000.
246 config MEMMAP_CACHEATTR
247 hex "Cache attributes for the memory address space"
251 These cache attributes are set up for noMMU systems. Each hex digit
252 specifies cache attributes for the corresponding 512MB memory
253 region: bits 0..3 -- for addresses 0x00000000..0x1fffffff,
254 bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on.
256 Cache attribute values are specific for the MMU type.
257 For region protection MMUs:
269 3: special (c and e are illegal, f is reserved).
273 2: WB, no-write-allocate cache,
278 hex "Physical address of the KSEG mapping"
279 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
282 This is the physical address where KSEG is mapped. Please refer to
283 the chosen KSEG layout help for the required address alignment.
284 Unpacked kernel image (including vectors) must be located completely
286 Physical memory below this address is not available to linux.
288 If unsure, leave the default value here.
290 config KERNEL_LOAD_ADDRESS
291 hex "Kernel load address"
292 default 0x60003000 if !MMU
293 default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
294 default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
296 This is the address where the kernel is loaded.
297 It is virtual address for MMUv2 configurations and physical address
298 for all other configurations.
300 If unsure, leave the default value here.
302 config VECTORS_OFFSET
303 hex "Kernel vectors offset"
306 This is the offset of the kernel image from the relocatable vectors
309 If unsure, leave the default value here.
314 default XTENSA_KSEG_MMU_V2
316 config XTENSA_KSEG_MMU_V2
317 bool "MMUv2: 128MB cached + 128MB uncached"
319 MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
320 at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
322 KSEG_PADDR must be aligned to 128MB.
324 config XTENSA_KSEG_256M
325 bool "256MB cached + 256MB uncached"
326 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
328 TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
329 with cache and to 0xc0000000 without cache.
330 KSEG_PADDR must be aligned to 256MB.
332 config XTENSA_KSEG_512M
333 bool "512MB cached + 512MB uncached"
334 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
336 TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
337 with cache and to 0xc0000000 without cache.
338 KSEG_PADDR must be aligned to 256MB.
343 bool "High Memory Support"
346 Linux can use the full amount of RAM in the system by
347 default. However, the default MMUv2 setup only maps the
348 lowermost 128 MB of memory linearly to the areas starting
349 at 0xd0000000 (cached) and 0xd8000000 (uncached).
350 When there are more than 128 MB memory in the system not
351 all of it can be "permanently mapped" by the kernel.
352 The physical memory that's not permanently mapped is called
355 If you are compiling a kernel which will never run on a
356 machine with more than 128 MB total physical RAM, answer
361 config FAST_SYSCALL_XTENSA
362 bool "Enable fast atomic syscalls"
365 fast_syscall_xtensa is a syscall that can make atomic operations
366 on UP kernel when processor has no s32c1i support.
368 This syscall is deprecated. It may have issues when called with
369 invalid arguments. It is provided only for backwards compatibility.
370 Only enable it if your userspace software requires it.
374 config FAST_SYSCALL_SPILL_REGISTERS
375 bool "Enable spill registers syscall"
378 fast_syscall_spill_registers is a syscall that spills all active
379 register windows of a calling userspace task onto its stack.
381 This syscall is deprecated. It may have issues when called with
382 invalid arguments. It is provided only for backwards compatibility.
383 Only enable it if your userspace software requires it.
389 config XTENSA_CALIBRATE_CCOUNT
392 On some platforms (XT2000, for example), the CPU clock rate can
393 vary. The frequency can be determined, however, by measuring
394 against a well known, fixed frequency, such as an UART oscillator.
396 config SERIAL_CONSOLE
399 menu "Platform options"
402 prompt "Xtensa System Type"
403 default XTENSA_PLATFORM_ISS
405 config XTENSA_PLATFORM_ISS
407 select XTENSA_CALIBRATE_CCOUNT
408 select SERIAL_CONSOLE
410 ISS is an acronym for Tensilica's Instruction Set Simulator.
412 config XTENSA_PLATFORM_XT2000
416 XT2000 is the name of Tensilica's feature-rich emulation platform.
417 This hardware is capable of running a full Linux distribution.
419 config XTENSA_PLATFORM_XTFPGA
421 select ETHOC if ETHERNET
422 select PLATFORM_WANT_DEFAULT_MEM if !MMU
423 select SERIAL_CONSOLE
424 select XTENSA_CALIBRATE_CCOUNT
426 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
427 This hardware is capable of running a full Linux distribution.
431 config PLATFORM_NR_IRQS
433 default 3 if XTENSA_PLATFORM_XT2000
436 config XTENSA_CPU_CLOCK
437 int "CPU clock rate [MHz]"
438 depends on !XTENSA_CALIBRATE_CCOUNT
441 config GENERIC_CALIBRATE_DELAY
442 bool "Auto calibration of the BogoMIPS value"
444 The BogoMIPS value can easily be derived from the CPU frequency.
447 bool "Default bootloader kernel arguments"
450 string "Initial kernel command string"
451 depends on CMDLINE_BOOL
452 default "console=ttyS0,38400 root=/dev/ram"
454 On some architectures (EBSA110 and CATS), there is currently no way
455 for the boot loader to pass arguments to the kernel. For these
456 architectures, you should supply some command-line options at build
457 time by entering them here. As a minimum, you should specify the
458 memory size and the root device (e.g., mem=64M root=/dev/nfs).
461 bool "Flattened Device Tree support"
463 select OF_EARLY_FLATTREE
465 Include support for flattened device tree machine descriptions.
467 config BUILTIN_DTB_SOURCE
468 string "DTB to build into the kernel image"
471 config PARSE_BOOTPARAM
472 bool "Parse bootparam block"
475 Parse parameters passed to the kernel from the bootloader. It may
476 be disabled if the kernel is known to run without the bootloader.
480 config BLK_DEV_SIMDISK
481 tristate "Host file-based simulated block device support"
483 depends on XTENSA_PLATFORM_ISS && BLOCK
485 Create block devices that map to files in the host file system.
486 Device binding to host file may be changed at runtime via proc
487 interface provided the device is not in use.
489 config BLK_DEV_SIMDISK_COUNT
490 int "Number of host file-based simulated block devices"
492 depends on BLK_DEV_SIMDISK
495 This is the default minimal number of created block devices.
496 Kernel/module parameter 'simdisk_count' may be used to change this
497 value at runtime. More file names (but no more than 10) may be
498 specified as parameters, simdisk_count grows accordingly.
500 config SIMDISK0_FILENAME
501 string "Host filename for the first simulated device"
502 depends on BLK_DEV_SIMDISK = y
505 Attach a first simdisk to a host file. Conventionally, this file
506 contains a root file system.
508 config SIMDISK1_FILENAME
509 string "Host filename for the second simulated device"
510 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
513 Another simulated disk in a host file for a buildroot-independent
516 config FORCE_MAX_ZONEORDER
517 int "Maximum zone order"
520 The kernel memory allocator divides physically contiguous memory
521 blocks into "zones", where each zone is a power of two number of
522 pages. This option selects the largest power of two that the kernel
523 keeps in the memory allocator. If you need to allocate very large
524 blocks of physically contiguous memory, then you may need to
527 This config option is actually maximum order plus one. For example,
528 a value of 11 means that the largest free memory block is 2^10 pages.
530 config PLATFORM_WANT_DEFAULT_MEM
533 config DEFAULT_MEM_START
535 prompt "PAGE_OFFSET/PHYS_OFFSET" if !MMU && PLATFORM_WANT_DEFAULT_MEM
536 default 0x60000000 if PLATFORM_WANT_DEFAULT_MEM
539 This is the base address used for both PAGE_OFFSET and PHYS_OFFSET
540 in noMMU configurations.
542 If unsure, leave the default value here.
545 bool "Enable XTFPGA LCD driver"
546 depends on XTENSA_PLATFORM_XTFPGA
549 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
550 progress messages there during bootup/shutdown. It may be useful
551 during board bringup.
555 config XTFPGA_LCD_BASE_ADDR
556 hex "XTFPGA LCD base address"
557 depends on XTFPGA_LCD
560 Base address of the LCD controller inside KIO region.
561 Different boards from XTFPGA family have LCD controller at different
562 addresses. Please consult prototyping user guide for your board for
563 the correct address. Wrong address here may lead to hardware lockup.
565 config XTFPGA_LCD_8BIT_ACCESS
566 bool "Use 8-bit access to XTFPGA LCD"
567 depends on XTFPGA_LCD
570 LCD may be connected with 4- or 8-bit interface, 8-bit access may
571 only be used with 8-bit interface. Please consult prototyping user
572 guide for your board for the correct interface width.
576 menu "Power management options"
578 source "kernel/power/Kconfig"