1# SPDX-License-Identifier: GPL-2.0 2config ZONE_DMA 3 def_bool y 4 5config XTENSA 6 def_bool y 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 12 select COMMON_CLK 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 HAVE_DEBUG_KMEMLEAK 19 select HAVE_DMA_API_DEBUG 20 select HAVE_DMA_CONTIGUOUS 21 select HAVE_EXIT_THREAD 22 select HAVE_FUNCTION_TRACER 23 select HAVE_FUTEX_CMPXCHG if !MMU 24 select HAVE_HW_BREAKPOINT if PERF_EVENTS 25 select HAVE_IRQ_TIME_ACCOUNTING 26 select HAVE_MEMBLOCK 27 select HAVE_OPROFILE 28 select HAVE_PERF_EVENTS 29 select IRQ_DOMAIN 30 select MODULES_USE_ELF_RELA 31 select NO_BOOTMEM 32 select PERF_USE_VMALLOC 33 select VIRT_TO_BUS 34 help 35 Xtensa processors are 32-bit RISC machines designed by Tensilica 36 primarily for embedded systems. These processors are both 37 configurable and extensible. The Linux port to the Xtensa 38 architecture supports all processor configurations and extensions, 39 with reasonable minimum requirements. The Xtensa Linux project has 40 a home page at <http://www.linux-xtensa.org/>. 41 42config RWSEM_XCHGADD_ALGORITHM 43 def_bool y 44 45config GENERIC_HWEIGHT 46 def_bool y 47 48config ARCH_HAS_ILOG2_U32 49 def_bool n 50 51config ARCH_HAS_ILOG2_U64 52 def_bool n 53 54config NO_IOPORT_MAP 55 def_bool n 56 57config HZ 58 int 59 default 100 60 61source "init/Kconfig" 62source "kernel/Kconfig.freezer" 63 64config LOCKDEP_SUPPORT 65 def_bool y 66 67config STACKTRACE_SUPPORT 68 def_bool y 69 70config TRACE_IRQFLAGS_SUPPORT 71 def_bool y 72 73config MMU 74 def_bool n 75 76config VARIANT_IRQ_SWITCH 77 def_bool n 78 79config HAVE_XTENSA_GPIO32 80 def_bool n 81 82menu "Processor type and features" 83 84choice 85 prompt "Xtensa Processor Configuration" 86 default XTENSA_VARIANT_FSF 87 88config XTENSA_VARIANT_FSF 89 bool "fsf - default (not generic) configuration" 90 select MMU 91 92config XTENSA_VARIANT_DC232B 93 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" 94 select MMU 95 select HAVE_XTENSA_GPIO32 96 help 97 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). 98 99config XTENSA_VARIANT_DC233C 100 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)" 101 select MMU 102 select HAVE_XTENSA_GPIO32 103 help 104 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE). 105 106config XTENSA_VARIANT_CUSTOM 107 bool "Custom Xtensa processor configuration" 108 select HAVE_XTENSA_GPIO32 109 help 110 Select this variant to use a custom Xtensa processor configuration. 111 You will be prompted for a processor variant CORENAME. 112endchoice 113 114config XTENSA_VARIANT_CUSTOM_NAME 115 string "Xtensa Processor Custom Core Variant Name" 116 depends on XTENSA_VARIANT_CUSTOM 117 help 118 Provide the name of a custom Xtensa processor variant. 119 This CORENAME selects arch/xtensa/variant/CORENAME. 120 Dont forget you have to select MMU if you have one. 121 122config XTENSA_VARIANT_NAME 123 string 124 default "dc232b" if XTENSA_VARIANT_DC232B 125 default "dc233c" if XTENSA_VARIANT_DC233C 126 default "fsf" if XTENSA_VARIANT_FSF 127 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM 128 129config XTENSA_VARIANT_MMU 130 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)" 131 depends on XTENSA_VARIANT_CUSTOM 132 default y 133 select MMU 134 help 135 Build a Conventional Kernel with full MMU support, 136 ie: it supports a TLB with auto-loading, page protection. 137 138config XTENSA_VARIANT_HAVE_PERF_EVENTS 139 bool "Core variant has Performance Monitor Module" 140 depends on XTENSA_VARIANT_CUSTOM 141 default n 142 help 143 Enable if core variant has Performance Monitor Module with 144 External Registers Interface. 145 146 If unsure, say N. 147 148config XTENSA_FAKE_NMI 149 bool "Treat PMM IRQ as NMI" 150 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS 151 default n 152 help 153 If PMM IRQ is the only IRQ at EXCM level it is safe to 154 treat it as NMI, which improves accuracy of profiling. 155 156 If there are other interrupts at or above PMM IRQ priority level 157 but not above the EXCM level, PMM IRQ still may be treated as NMI, 158 but only if these IRQs are not used. There will be a build warning 159 saying that this is not safe, and a bugcheck if one of these IRQs 160 actually fire. 161 162 If unsure, say N. 163 164config XTENSA_UNALIGNED_USER 165 bool "Unaligned memory access in use space" 166 help 167 The Xtensa architecture currently does not handle unaligned 168 memory accesses in hardware but through an exception handler. 169 Per default, unaligned memory accesses are disabled in user space. 170 171 Say Y here to enable unaligned memory access in user space. 172 173source "kernel/Kconfig.preempt" 174 175config HAVE_SMP 176 bool "System Supports SMP (MX)" 177 depends on XTENSA_VARIANT_CUSTOM 178 select XTENSA_MX 179 help 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. 183 184 Multiprocessor support in implemented with external cache and 185 interrupt controllers. 186 187 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. 190 191 You still have to select "Enable SMP" to enable SMP on this SOC. 192 193config SMP 194 bool "Enable Symmetric multi-processing support" 195 depends on HAVE_SMP 196 select GENERIC_SMP_IDLE_THREAD 197 help 198 Enabled SMP Software; allows more than one CPU/CORE 199 to be activated during startup. 200 201config NR_CPUS 202 depends on SMP 203 int "Maximum number of CPUs (2-32)" 204 range 2 32 205 default "4" 206 207config HOTPLUG_CPU 208 bool "Enable CPU hotplug support" 209 depends on SMP 210 help 211 Say Y here to allow turning CPUs off and on. CPUs can be 212 controlled through /sys/devices/system/cpu. 213 214 Say N if you want to disable CPU hotplug. 215 216config 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 220 help 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). 226 227 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 229 KDUMP. 230 231 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. 240 241 Selecting this will cause U-Boot to set the KERNEL Load and Entry 242 address at 0x00003000 instead of the mapped std of 0xD0003000. 243 244 If in doubt, say Y. 245 246config KSEG_PADDR 247 hex "Physical address of the KSEG mapping" 248 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU 249 default 0x00000000 250 help 251 This is the physical address where KSEG is mapped. Please refer to 252 the chosen KSEG layout help for the required address alignment. 253 Unpacked kernel image (including vectors) must be located completely 254 within KSEG. 255 Physical memory below this address is not available to linux. 256 257 If unsure, leave the default value here. 258 259config KERNEL_LOAD_ADDRESS 260 hex "Kernel load address" 261 default 0x60003000 if !MMU 262 default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 263 default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 264 help 265 This is the address where the kernel is loaded. 266 It is virtual address for MMUv2 configurations and physical address 267 for all other configurations. 268 269 If unsure, leave the default value here. 270 271config VECTORS_OFFSET 272 hex "Kernel vectors offset" 273 default 0x00003000 274 help 275 This is the offset of the kernel image from the relocatable vectors 276 base. 277 278 If unsure, leave the default value here. 279 280choice 281 prompt "KSEG layout" 282 depends on MMU 283 default XTENSA_KSEG_MMU_V2 284 285config XTENSA_KSEG_MMU_V2 286 bool "MMUv2: 128MB cached + 128MB uncached" 287 help 288 MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting 289 at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000 290 without cache. 291 KSEG_PADDR must be aligned to 128MB. 292 293config XTENSA_KSEG_256M 294 bool "256MB cached + 256MB uncached" 295 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 296 help 297 TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000 298 with cache and to 0xc0000000 without cache. 299 KSEG_PADDR must be aligned to 256MB. 300 301config XTENSA_KSEG_512M 302 bool "512MB cached + 512MB uncached" 303 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 304 help 305 TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000 306 with cache and to 0xc0000000 without cache. 307 KSEG_PADDR must be aligned to 256MB. 308 309endchoice 310 311config HIGHMEM 312 bool "High Memory Support" 313 depends on MMU 314 help 315 Linux can use the full amount of RAM in the system by 316 default. However, the default MMUv2 setup only maps the 317 lowermost 128 MB of memory linearly to the areas starting 318 at 0xd0000000 (cached) and 0xd8000000 (uncached). 319 When there are more than 128 MB memory in the system not 320 all of it can be "permanently mapped" by the kernel. 321 The physical memory that's not permanently mapped is called 322 "high memory". 323 324 If you are compiling a kernel which will never run on a 325 machine with more than 128 MB total physical RAM, answer 326 N here. 327 328 If unsure, say Y. 329 330config FAST_SYSCALL_XTENSA 331 bool "Enable fast atomic syscalls" 332 default n 333 help 334 fast_syscall_xtensa is a syscall that can make atomic operations 335 on UP kernel when processor has no s32c1i support. 336 337 This syscall is deprecated. It may have issues when called with 338 invalid arguments. It is provided only for backwards compatibility. 339 Only enable it if your userspace software requires it. 340 341 If unsure, say N. 342 343config FAST_SYSCALL_SPILL_REGISTERS 344 bool "Enable spill registers syscall" 345 default n 346 help 347 fast_syscall_spill_registers is a syscall that spills all active 348 register windows of a calling userspace task onto its stack. 349 350 This syscall is deprecated. It may have issues when called with 351 invalid arguments. It is provided only for backwards compatibility. 352 Only enable it if your userspace software requires it. 353 354 If unsure, say N. 355 356endmenu 357 358config XTENSA_CALIBRATE_CCOUNT 359 def_bool n 360 help 361 On some platforms (XT2000, for example), the CPU clock rate can 362 vary. The frequency can be determined, however, by measuring 363 against a well known, fixed frequency, such as an UART oscillator. 364 365config SERIAL_CONSOLE 366 def_bool n 367 368menu "Bus options" 369 370config PCI 371 bool "PCI support" 372 default y 373 help 374 Find out whether you have a PCI motherboard. PCI is the name of a 375 bus system, i.e. the way the CPU talks to the other stuff inside 376 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 377 VESA. If you have PCI, say Y, otherwise N. 378 379source "drivers/pci/Kconfig" 380 381endmenu 382 383menu "Platform options" 384 385choice 386 prompt "Xtensa System Type" 387 default XTENSA_PLATFORM_ISS 388 389config XTENSA_PLATFORM_ISS 390 bool "ISS" 391 select XTENSA_CALIBRATE_CCOUNT 392 select SERIAL_CONSOLE 393 help 394 ISS is an acronym for Tensilica's Instruction Set Simulator. 395 396config XTENSA_PLATFORM_XT2000 397 bool "XT2000" 398 select HAVE_IDE 399 help 400 XT2000 is the name of Tensilica's feature-rich emulation platform. 401 This hardware is capable of running a full Linux distribution. 402 403config XTENSA_PLATFORM_XTFPGA 404 bool "XTFPGA" 405 select ETHOC if ETHERNET 406 select PLATFORM_WANT_DEFAULT_MEM if !MMU 407 select SERIAL_CONSOLE 408 select XTENSA_CALIBRATE_CCOUNT 409 help 410 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605). 411 This hardware is capable of running a full Linux distribution. 412 413endchoice 414 415 416config XTENSA_CPU_CLOCK 417 int "CPU clock rate [MHz]" 418 depends on !XTENSA_CALIBRATE_CCOUNT 419 default 16 420 421config GENERIC_CALIBRATE_DELAY 422 bool "Auto calibration of the BogoMIPS value" 423 help 424 The BogoMIPS value can easily be derived from the CPU frequency. 425 426config CMDLINE_BOOL 427 bool "Default bootloader kernel arguments" 428 429config CMDLINE 430 string "Initial kernel command string" 431 depends on CMDLINE_BOOL 432 default "console=ttyS0,38400 root=/dev/ram" 433 help 434 On some architectures (EBSA110 and CATS), there is currently no way 435 for the boot loader to pass arguments to the kernel. For these 436 architectures, you should supply some command-line options at build 437 time by entering them here. As a minimum, you should specify the 438 memory size and the root device (e.g., mem=64M root=/dev/nfs). 439 440config USE_OF 441 bool "Flattened Device Tree support" 442 select OF 443 select OF_EARLY_FLATTREE 444 select OF_RESERVED_MEM 445 help 446 Include support for flattened device tree machine descriptions. 447 448config BUILTIN_DTB 449 string "DTB to build into the kernel image" 450 depends on OF 451 452config BLK_DEV_SIMDISK 453 tristate "Host file-based simulated block device support" 454 default n 455 depends on XTENSA_PLATFORM_ISS && BLOCK 456 help 457 Create block devices that map to files in the host file system. 458 Device binding to host file may be changed at runtime via proc 459 interface provided the device is not in use. 460 461config BLK_DEV_SIMDISK_COUNT 462 int "Number of host file-based simulated block devices" 463 range 1 10 464 depends on BLK_DEV_SIMDISK 465 default 2 466 help 467 This is the default minimal number of created block devices. 468 Kernel/module parameter 'simdisk_count' may be used to change this 469 value at runtime. More file names (but no more than 10) may be 470 specified as parameters, simdisk_count grows accordingly. 471 472config SIMDISK0_FILENAME 473 string "Host filename for the first simulated device" 474 depends on BLK_DEV_SIMDISK = y 475 default "" 476 help 477 Attach a first simdisk to a host file. Conventionally, this file 478 contains a root file system. 479 480config SIMDISK1_FILENAME 481 string "Host filename for the second simulated device" 482 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1 483 default "" 484 help 485 Another simulated disk in a host file for a buildroot-independent 486 storage. 487 488source "mm/Kconfig" 489 490config FORCE_MAX_ZONEORDER 491 int "Maximum zone order" 492 default "11" 493 help 494 The kernel memory allocator divides physically contiguous memory 495 blocks into "zones", where each zone is a power of two number of 496 pages. This option selects the largest power of two that the kernel 497 keeps in the memory allocator. If you need to allocate very large 498 blocks of physically contiguous memory, then you may need to 499 increase this value. 500 501 This config option is actually maximum order plus one. For example, 502 a value of 11 means that the largest free memory block is 2^10 pages. 503 504source "drivers/pcmcia/Kconfig" 505 506config PLATFORM_WANT_DEFAULT_MEM 507 def_bool n 508 509config DEFAULT_MEM_START 510 hex "Physical address of the default memory area start" 511 depends on PLATFORM_WANT_DEFAULT_MEM 512 default 0x00000000 if MMU 513 default 0x60000000 if !MMU 514 help 515 This is the base address of the default memory area. 516 Default memory area has platform-specific meaning, it may be used 517 for e.g. early cache initialization. 518 519 If unsure, leave the default value here. 520 521config DEFAULT_MEM_SIZE 522 hex "Maximal size of the default memory area" 523 depends on PLATFORM_WANT_DEFAULT_MEM 524 default 0x04000000 525 help 526 This is the size of the default memory area. 527 Default memory area has platform-specific meaning, it may be used 528 for e.g. early cache initialization. 529 530 If unsure, leave the default value here. 531 532config XTFPGA_LCD 533 bool "Enable XTFPGA LCD driver" 534 depends on XTENSA_PLATFORM_XTFPGA 535 default n 536 help 537 There's a 2x16 LCD on most of XTFPGA boards, kernel may output 538 progress messages there during bootup/shutdown. It may be useful 539 during board bringup. 540 541 If unsure, say N. 542 543config XTFPGA_LCD_BASE_ADDR 544 hex "XTFPGA LCD base address" 545 depends on XTFPGA_LCD 546 default "0x0d0c0000" 547 help 548 Base address of the LCD controller inside KIO region. 549 Different boards from XTFPGA family have LCD controller at different 550 addresses. Please consult prototyping user guide for your board for 551 the correct address. Wrong address here may lead to hardware lockup. 552 553config XTFPGA_LCD_8BIT_ACCESS 554 bool "Use 8-bit access to XTFPGA LCD" 555 depends on XTFPGA_LCD 556 default n 557 help 558 LCD may be connected with 4- or 8-bit interface, 8-bit access may 559 only be used with 8-bit interface. Please consult prototyping user 560 guide for your board for the correct interface width. 561 562endmenu 563 564menu "Executable file formats" 565 566source "fs/Kconfig.binfmt" 567 568endmenu 569 570menu "Power management options" 571 572source "kernel/power/Kconfig" 573 574endmenu 575 576source "net/Kconfig" 577 578source "drivers/Kconfig" 579 580source "fs/Kconfig" 581 582source "arch/xtensa/Kconfig.debug" 583 584source "security/Kconfig" 585 586source "crypto/Kconfig" 587 588source "lib/Kconfig" 589 590 591