1 # SPDX-License-Identifier: GPL-2.0
7 select ARCH_HAS_SG_CHAIN
8 select ARCH_HAS_SYNC_DMA_FOR_CPU
9 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
10 select ARCH_NO_COHERENT_DMA_MMAP if !MMU
11 select ARCH_WANT_FRAME_POINTERS
12 select ARCH_WANT_IPC_PARSE_VERSION
13 select BUILDTIME_EXTABLE_SORT
14 select CLONE_BACKWARDS
16 select DMA_NONCOHERENT_OPS
17 select GENERIC_ATOMIC64
18 select GENERIC_CLOCKEVENTS
19 select GENERIC_IRQ_SHOW
20 select GENERIC_PCI_IOMAP
21 select GENERIC_SCHED_CLOCK
22 select GENERIC_STRNCPY_FROM_USER if KASAN
23 select HAVE_ARCH_KASAN if MMU
24 select HAVE_DEBUG_KMEMLEAK
25 select HAVE_DMA_CONTIGUOUS
26 select HAVE_EXIT_THREAD
27 select HAVE_FUNCTION_TRACER
28 select HAVE_FUTEX_CMPXCHG if !MMU
29 select HAVE_HW_BREAKPOINT if PERF_EVENTS
30 select HAVE_IRQ_TIME_ACCOUNTING
33 select HAVE_PERF_EVENTS
34 select HAVE_STACKPROTECTOR
36 select MODULES_USE_ELF_RELA
38 select PERF_USE_VMALLOC
41 Xtensa processors are 32-bit RISC machines designed by Tensilica
42 primarily for embedded systems. These processors are both
43 configurable and extensible. The Linux port to the Xtensa
44 architecture supports all processor configurations and extensions,
45 with reasonable minimum requirements. The Xtensa Linux project has
46 a home page at <http://www.linux-xtensa.org/>.
48 config RWSEM_XCHGADD_ALGORITHM
51 config GENERIC_HWEIGHT
54 config ARCH_HAS_ILOG2_U32
57 config ARCH_HAS_ILOG2_U64
67 config LOCKDEP_SUPPORT
70 config STACKTRACE_SUPPORT
73 config TRACE_IRQFLAGS_SUPPORT
79 config HAVE_XTENSA_GPIO32
82 config KASAN_SHADOW_OFFSET
86 menu "Processor type and features"
89 prompt "Xtensa Processor Configuration"
90 default XTENSA_VARIANT_FSF
92 config XTENSA_VARIANT_FSF
93 bool "fsf - default (not generic) configuration"
96 config XTENSA_VARIANT_DC232B
97 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
99 select HAVE_XTENSA_GPIO32
101 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
103 config XTENSA_VARIANT_DC233C
104 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
106 select HAVE_XTENSA_GPIO32
108 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
110 config XTENSA_VARIANT_CUSTOM
111 bool "Custom Xtensa processor configuration"
112 select HAVE_XTENSA_GPIO32
114 Select this variant to use a custom Xtensa processor configuration.
115 You will be prompted for a processor variant CORENAME.
118 config XTENSA_VARIANT_CUSTOM_NAME
119 string "Xtensa Processor Custom Core Variant Name"
120 depends on XTENSA_VARIANT_CUSTOM
122 Provide the name of a custom Xtensa processor variant.
123 This CORENAME selects arch/xtensa/variant/CORENAME.
124 Dont forget you have to select MMU if you have one.
126 config XTENSA_VARIANT_NAME
128 default "dc232b" if XTENSA_VARIANT_DC232B
129 default "dc233c" if XTENSA_VARIANT_DC233C
130 default "fsf" if XTENSA_VARIANT_FSF
131 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM
133 config XTENSA_VARIANT_MMU
134 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
135 depends on XTENSA_VARIANT_CUSTOM
139 Build a Conventional Kernel with full MMU support,
140 ie: it supports a TLB with auto-loading, page protection.
142 config XTENSA_VARIANT_HAVE_PERF_EVENTS
143 bool "Core variant has Performance Monitor Module"
144 depends on XTENSA_VARIANT_CUSTOM
147 Enable if core variant has Performance Monitor Module with
148 External Registers Interface.
152 config XTENSA_FAKE_NMI
153 bool "Treat PMM IRQ as NMI"
154 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS
157 If PMM IRQ is the only IRQ at EXCM level it is safe to
158 treat it as NMI, which improves accuracy of profiling.
160 If there are other interrupts at or above PMM IRQ priority level
161 but not above the EXCM level, PMM IRQ still may be treated as NMI,
162 but only if these IRQs are not used. There will be a build warning
163 saying that this is not safe, and a bugcheck if one of these IRQs
168 config XTENSA_UNALIGNED_USER
169 bool "Unaligned memory access in use space"
171 The Xtensa architecture currently does not handle unaligned
172 memory accesses in hardware but through an exception handler.
173 Per default, unaligned memory accesses are disabled in user space.
175 Say Y here to enable unaligned memory access in user space.
178 bool "System Supports SMP (MX)"
179 depends on XTENSA_VARIANT_CUSTOM
182 This option is use to indicate that the system-on-a-chip (SOC)
183 supports Multiprocessing. Multiprocessor support implemented above
184 the CPU core definition and currently needs to be selected manually.
186 Multiprocessor support in implemented with external cache and
187 interrupt controllers.
189 The MX interrupt distributer adds Interprocessor Interrupts
190 and causes the IRQ numbers to be increased by 4 for devices
191 like the open cores ethernet driver and the serial interface.
193 You still have to select "Enable SMP" to enable SMP on this SOC.
196 bool "Enable Symmetric multi-processing support"
198 select GENERIC_SMP_IDLE_THREAD
200 Enabled SMP Software; allows more than one CPU/CORE
201 to be activated during startup.
205 int "Maximum number of CPUs (2-32)"
210 bool "Enable CPU hotplug support"
213 Say Y here to allow turning CPUs off and on. CPUs can be
214 controlled through /sys/devices/system/cpu.
216 Say N if you want to disable CPU hotplug.
218 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
219 bool "Initialize Xtensa MMU inside the Linux kernel code"
220 depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B
221 default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM
223 Earlier version initialized the MMU in the exception vector
224 before jumping to _startup in head.S and had an advantage that
225 it was possible to place a software breakpoint at 'reset' and
226 then enter your normal kernel breakpoints once the MMU was mapped
227 to the kernel mappings (0XC0000000).
229 This unfortunately won't work for U-Boot and likely also wont
230 work for using KEXEC to have a hot kernel ready for doing a
233 So now the MMU is initialized in head.S but it's necessary to
234 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
235 xt-gdb can't place a Software Breakpoint in the 0XD region prior
236 to mapping the MMU and after mapping even if the area of low memory
237 was mapped gdb wouldn't remove the breakpoint on hitting it as the
238 PC wouldn't match. Since Hardware Breakpoints are recommended for
239 Linux configurations it seems reasonable to just assume they exist
240 and leave this older mechanism for unfortunate souls that choose
241 not to follow Tensilica's recommendation.
243 Selecting this will cause U-Boot to set the KERNEL Load and Entry
244 address at 0x00003000 instead of the mapped std of 0xD0003000.
248 config MEMMAP_CACHEATTR
249 hex "Cache attributes for the memory address space"
253 These cache attributes are set up for noMMU systems. Each hex digit
254 specifies cache attributes for the corresponding 512MB memory
255 region: bits 0..3 -- for addresses 0x00000000..0x1fffffff,
256 bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on.
258 Cache attribute values are specific for the MMU type, so e.g.
259 for region protection MMUs: 2 is cache bypass, 4 is WB cached,
260 1 is WT cached, f is illegal. For ful MMU: bit 0 makes it executable,
261 bit 1 makes it writable, bits 2..3 meaning is 0: cache bypass,
262 1: WB cache, 2: WT cache, 3: special (c and e are illegal, f is
266 hex "Physical address of the KSEG mapping"
267 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
270 This is the physical address where KSEG is mapped. Please refer to
271 the chosen KSEG layout help for the required address alignment.
272 Unpacked kernel image (including vectors) must be located completely
274 Physical memory below this address is not available to linux.
276 If unsure, leave the default value here.
278 config KERNEL_LOAD_ADDRESS
279 hex "Kernel load address"
280 default 0x60003000 if !MMU
281 default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
282 default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
284 This is the address where the kernel is loaded.
285 It is virtual address for MMUv2 configurations and physical address
286 for all other configurations.
288 If unsure, leave the default value here.
290 config VECTORS_OFFSET
291 hex "Kernel vectors offset"
294 This is the offset of the kernel image from the relocatable vectors
297 If unsure, leave the default value here.
302 default XTENSA_KSEG_MMU_V2
304 config XTENSA_KSEG_MMU_V2
305 bool "MMUv2: 128MB cached + 128MB uncached"
307 MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
308 at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
310 KSEG_PADDR must be aligned to 128MB.
312 config XTENSA_KSEG_256M
313 bool "256MB cached + 256MB uncached"
314 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
316 TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
317 with cache and to 0xc0000000 without cache.
318 KSEG_PADDR must be aligned to 256MB.
320 config XTENSA_KSEG_512M
321 bool "512MB cached + 512MB uncached"
322 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
324 TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
325 with cache and to 0xc0000000 without cache.
326 KSEG_PADDR must be aligned to 256MB.
331 bool "High Memory Support"
334 Linux can use the full amount of RAM in the system by
335 default. However, the default MMUv2 setup only maps the
336 lowermost 128 MB of memory linearly to the areas starting
337 at 0xd0000000 (cached) and 0xd8000000 (uncached).
338 When there are more than 128 MB memory in the system not
339 all of it can be "permanently mapped" by the kernel.
340 The physical memory that's not permanently mapped is called
343 If you are compiling a kernel which will never run on a
344 machine with more than 128 MB total physical RAM, answer
349 config FAST_SYSCALL_XTENSA
350 bool "Enable fast atomic syscalls"
353 fast_syscall_xtensa is a syscall that can make atomic operations
354 on UP kernel when processor has no s32c1i support.
356 This syscall is deprecated. It may have issues when called with
357 invalid arguments. It is provided only for backwards compatibility.
358 Only enable it if your userspace software requires it.
362 config FAST_SYSCALL_SPILL_REGISTERS
363 bool "Enable spill registers syscall"
366 fast_syscall_spill_registers is a syscall that spills all active
367 register windows of a calling userspace task onto its stack.
369 This syscall is deprecated. It may have issues when called with
370 invalid arguments. It is provided only for backwards compatibility.
371 Only enable it if your userspace software requires it.
377 config XTENSA_CALIBRATE_CCOUNT
380 On some platforms (XT2000, for example), the CPU clock rate can
381 vary. The frequency can be determined, however, by measuring
382 against a well known, fixed frequency, such as an UART oscillator.
384 config SERIAL_CONSOLE
393 Find out whether you have a PCI motherboard. PCI is the name of a
394 bus system, i.e. the way the CPU talks to the other stuff inside
395 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
396 VESA. If you have PCI, say Y, otherwise N.
398 source "drivers/pci/Kconfig"
402 menu "Platform options"
405 prompt "Xtensa System Type"
406 default XTENSA_PLATFORM_ISS
408 config XTENSA_PLATFORM_ISS
410 select XTENSA_CALIBRATE_CCOUNT
411 select SERIAL_CONSOLE
413 ISS is an acronym for Tensilica's Instruction Set Simulator.
415 config XTENSA_PLATFORM_XT2000
419 XT2000 is the name of Tensilica's feature-rich emulation platform.
420 This hardware is capable of running a full Linux distribution.
422 config XTENSA_PLATFORM_XTFPGA
424 select ETHOC if ETHERNET
425 select PLATFORM_WANT_DEFAULT_MEM if !MMU
426 select SERIAL_CONSOLE
427 select XTENSA_CALIBRATE_CCOUNT
429 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
430 This hardware is capable of running a full Linux distribution.
434 config PLATFORM_NR_IRQS
436 default 3 if XTENSA_PLATFORM_XT2000
439 config XTENSA_CPU_CLOCK
440 int "CPU clock rate [MHz]"
441 depends on !XTENSA_CALIBRATE_CCOUNT
444 config GENERIC_CALIBRATE_DELAY
445 bool "Auto calibration of the BogoMIPS value"
447 The BogoMIPS value can easily be derived from the CPU frequency.
450 bool "Default bootloader kernel arguments"
453 string "Initial kernel command string"
454 depends on CMDLINE_BOOL
455 default "console=ttyS0,38400 root=/dev/ram"
457 On some architectures (EBSA110 and CATS), there is currently no way
458 for the boot loader to pass arguments to the kernel. For these
459 architectures, you should supply some command-line options at build
460 time by entering them here. As a minimum, you should specify the
461 memory size and the root device (e.g., mem=64M root=/dev/nfs).
464 bool "Flattened Device Tree support"
466 select OF_EARLY_FLATTREE
467 select OF_RESERVED_MEM
469 Include support for flattened device tree machine descriptions.
472 string "DTB to build into the kernel image"
475 config PARSE_BOOTPARAM
476 bool "Parse bootparam block"
479 Parse parameters passed to the kernel from the bootloader. It may
480 be disabled if the kernel is known to run without the bootloader.
484 config BLK_DEV_SIMDISK
485 tristate "Host file-based simulated block device support"
487 depends on XTENSA_PLATFORM_ISS && BLOCK
489 Create block devices that map to files in the host file system.
490 Device binding to host file may be changed at runtime via proc
491 interface provided the device is not in use.
493 config BLK_DEV_SIMDISK_COUNT
494 int "Number of host file-based simulated block devices"
496 depends on BLK_DEV_SIMDISK
499 This is the default minimal number of created block devices.
500 Kernel/module parameter 'simdisk_count' may be used to change this
501 value at runtime. More file names (but no more than 10) may be
502 specified as parameters, simdisk_count grows accordingly.
504 config SIMDISK0_FILENAME
505 string "Host filename for the first simulated device"
506 depends on BLK_DEV_SIMDISK = y
509 Attach a first simdisk to a host file. Conventionally, this file
510 contains a root file system.
512 config SIMDISK1_FILENAME
513 string "Host filename for the second simulated device"
514 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
517 Another simulated disk in a host file for a buildroot-independent
520 config FORCE_MAX_ZONEORDER
521 int "Maximum zone order"
524 The kernel memory allocator divides physically contiguous memory
525 blocks into "zones", where each zone is a power of two number of
526 pages. This option selects the largest power of two that the kernel
527 keeps in the memory allocator. If you need to allocate very large
528 blocks of physically contiguous memory, then you may need to
531 This config option is actually maximum order plus one. For example,
532 a value of 11 means that the largest free memory block is 2^10 pages.
534 source "drivers/pcmcia/Kconfig"
536 config PLATFORM_WANT_DEFAULT_MEM
539 config DEFAULT_MEM_START
541 prompt "PAGE_OFFSET/PHYS_OFFSET" if !MMU && PLATFORM_WANT_DEFAULT_MEM
542 default 0x60000000 if PLATFORM_WANT_DEFAULT_MEM
545 This is the base address used for both PAGE_OFFSET and PHYS_OFFSET
546 in noMMU configurations.
548 If unsure, leave the default value here.
551 bool "Enable XTFPGA LCD driver"
552 depends on XTENSA_PLATFORM_XTFPGA
555 There's a 2x16 LCD on most of XTFPGA boards, kernel may output
556 progress messages there during bootup/shutdown. It may be useful
557 during board bringup.
561 config XTFPGA_LCD_BASE_ADDR
562 hex "XTFPGA LCD base address"
563 depends on XTFPGA_LCD
566 Base address of the LCD controller inside KIO region.
567 Different boards from XTFPGA family have LCD controller at different
568 addresses. Please consult prototyping user guide for your board for
569 the correct address. Wrong address here may lead to hardware lockup.
571 config XTFPGA_LCD_8BIT_ACCESS
572 bool "Use 8-bit access to XTFPGA LCD"
573 depends on XTFPGA_LCD
576 LCD may be connected with 4- or 8-bit interface, 8-bit access may
577 only be used with 8-bit interface. Please consult prototyping user
578 guide for your board for the correct interface width.
582 menu "Power management options"
584 source "kernel/power/Kconfig"