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_CC_STACKPROTECTOR 19 select HAVE_DEBUG_KMEMLEAK 20 select HAVE_DMA_API_DEBUG 21 select HAVE_DMA_CONTIGUOUS 22 select HAVE_EXIT_THREAD 23 select HAVE_FUNCTION_TRACER 24 select HAVE_FUTEX_CMPXCHG if !MMU 25 select HAVE_HW_BREAKPOINT if PERF_EVENTS 26 select HAVE_IRQ_TIME_ACCOUNTING 27 select HAVE_MEMBLOCK 28 select HAVE_OPROFILE 29 select HAVE_PERF_EVENTS 30 select IRQ_DOMAIN 31 select MODULES_USE_ELF_RELA 32 select NO_BOOTMEM 33 select PERF_USE_VMALLOC 34 select VIRT_TO_BUS 35 help 36 Xtensa processors are 32-bit RISC machines designed by Tensilica 37 primarily for embedded systems. These processors are both 38 configurable and extensible. The Linux port to the Xtensa 39 architecture supports all processor configurations and extensions, 40 with reasonable minimum requirements. The Xtensa Linux project has 41 a home page at <http://www.linux-xtensa.org/>. 42 43config RWSEM_XCHGADD_ALGORITHM 44 def_bool y 45 46config GENERIC_HWEIGHT 47 def_bool y 48 49config ARCH_HAS_ILOG2_U32 50 def_bool n 51 52config ARCH_HAS_ILOG2_U64 53 def_bool n 54 55config NO_IOPORT_MAP 56 def_bool n 57 58config HZ 59 int 60 default 100 61 62source "init/Kconfig" 63source "kernel/Kconfig.freezer" 64 65config LOCKDEP_SUPPORT 66 def_bool y 67 68config STACKTRACE_SUPPORT 69 def_bool y 70 71config TRACE_IRQFLAGS_SUPPORT 72 def_bool y 73 74config MMU 75 def_bool n 76 77config VARIANT_IRQ_SWITCH 78 def_bool n 79 80config HAVE_XTENSA_GPIO32 81 def_bool n 82 83menu "Processor type and features" 84 85choice 86 prompt "Xtensa Processor Configuration" 87 default XTENSA_VARIANT_FSF 88 89config XTENSA_VARIANT_FSF 90 bool "fsf - default (not generic) configuration" 91 select MMU 92 93config XTENSA_VARIANT_DC232B 94 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" 95 select MMU 96 select HAVE_XTENSA_GPIO32 97 help 98 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). 99 100config XTENSA_VARIANT_DC233C 101 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)" 102 select MMU 103 select HAVE_XTENSA_GPIO32 104 help 105 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE). 106 107config XTENSA_VARIANT_CUSTOM 108 bool "Custom Xtensa processor configuration" 109 select HAVE_XTENSA_GPIO32 110 help 111 Select this variant to use a custom Xtensa processor configuration. 112 You will be prompted for a processor variant CORENAME. 113endchoice 114 115config XTENSA_VARIANT_CUSTOM_NAME 116 string "Xtensa Processor Custom Core Variant Name" 117 depends on XTENSA_VARIANT_CUSTOM 118 help 119 Provide the name of a custom Xtensa processor variant. 120 This CORENAME selects arch/xtensa/variant/CORENAME. 121 Dont forget you have to select MMU if you have one. 122 123config XTENSA_VARIANT_NAME 124 string 125 default "dc232b" if XTENSA_VARIANT_DC232B 126 default "dc233c" if XTENSA_VARIANT_DC233C 127 default "fsf" if XTENSA_VARIANT_FSF 128 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM 129 130config XTENSA_VARIANT_MMU 131 bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)" 132 depends on XTENSA_VARIANT_CUSTOM 133 default y 134 select MMU 135 help 136 Build a Conventional Kernel with full MMU support, 137 ie: it supports a TLB with auto-loading, page protection. 138 139config XTENSA_VARIANT_HAVE_PERF_EVENTS 140 bool "Core variant has Performance Monitor Module" 141 depends on XTENSA_VARIANT_CUSTOM 142 default n 143 help 144 Enable if core variant has Performance Monitor Module with 145 External Registers Interface. 146 147 If unsure, say N. 148 149config XTENSA_FAKE_NMI 150 bool "Treat PMM IRQ as NMI" 151 depends on XTENSA_VARIANT_HAVE_PERF_EVENTS 152 default n 153 help 154 If PMM IRQ is the only IRQ at EXCM level it is safe to 155 treat it as NMI, which improves accuracy of profiling. 156 157 If there are other interrupts at or above PMM IRQ priority level 158 but not above the EXCM level, PMM IRQ still may be treated as NMI, 159 but only if these IRQs are not used. There will be a build warning 160 saying that this is not safe, and a bugcheck if one of these IRQs 161 actually fire. 162 163 If unsure, say N. 164 165config XTENSA_UNALIGNED_USER 166 bool "Unaligned memory access in use space" 167 help 168 The Xtensa architecture currently does not handle unaligned 169 memory accesses in hardware but through an exception handler. 170 Per default, unaligned memory accesses are disabled in user space. 171 172 Say Y here to enable unaligned memory access in user space. 173 174source "kernel/Kconfig.preempt" 175 176config HAVE_SMP 177 bool "System Supports SMP (MX)" 178 depends on XTENSA_VARIANT_CUSTOM 179 select XTENSA_MX 180 help 181 This option is use to indicate that the system-on-a-chip (SOC) 182 supports Multiprocessing. Multiprocessor support implemented above 183 the CPU core definition and currently needs to be selected manually. 184 185 Multiprocessor support in implemented with external cache and 186 interrupt controllers. 187 188 The MX interrupt distributer adds Interprocessor Interrupts 189 and causes the IRQ numbers to be increased by 4 for devices 190 like the open cores ethernet driver and the serial interface. 191 192 You still have to select "Enable SMP" to enable SMP on this SOC. 193 194config SMP 195 bool "Enable Symmetric multi-processing support" 196 depends on HAVE_SMP 197 select GENERIC_SMP_IDLE_THREAD 198 help 199 Enabled SMP Software; allows more than one CPU/CORE 200 to be activated during startup. 201 202config NR_CPUS 203 depends on SMP 204 int "Maximum number of CPUs (2-32)" 205 range 2 32 206 default "4" 207 208config HOTPLUG_CPU 209 bool "Enable CPU hotplug support" 210 depends on SMP 211 help 212 Say Y here to allow turning CPUs off and on. CPUs can be 213 controlled through /sys/devices/system/cpu. 214 215 Say N if you want to disable CPU hotplug. 216 217config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 218 bool "Initialize Xtensa MMU inside the Linux kernel code" 219 depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B 220 default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM 221 help 222 Earlier version initialized the MMU in the exception vector 223 before jumping to _startup in head.S and had an advantage that 224 it was possible to place a software breakpoint at 'reset' and 225 then enter your normal kernel breakpoints once the MMU was mapped 226 to the kernel mappings (0XC0000000). 227 228 This unfortunately doesn't work for U-Boot and likley also wont 229 work for using KEXEC to have a hot kernel ready for doing a 230 KDUMP. 231 232 So now the MMU is initialized in head.S but it's necessary to 233 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup. 234 xt-gdb can't place a Software Breakpoint in the 0XD region prior 235 to mapping the MMU and after mapping even if the area of low memory 236 was mapped gdb wouldn't remove the breakpoint on hitting it as the 237 PC wouldn't match. Since Hardware Breakpoints are recommended for 238 Linux configurations it seems reasonable to just assume they exist 239 and leave this older mechanism for unfortunate souls that choose 240 not to follow Tensilica's recommendation. 241 242 Selecting this will cause U-Boot to set the KERNEL Load and Entry 243 address at 0x00003000 instead of the mapped std of 0xD0003000. 244 245 If in doubt, say Y. 246 247config KSEG_PADDR 248 hex "Physical address of the KSEG mapping" 249 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU 250 default 0x00000000 251 help 252 This is the physical address where KSEG is mapped. Please refer to 253 the chosen KSEG layout help for the required address alignment. 254 Unpacked kernel image (including vectors) must be located completely 255 within KSEG. 256 Physical memory below this address is not available to linux. 257 258 If unsure, leave the default value here. 259 260config KERNEL_LOAD_ADDRESS 261 hex "Kernel load address" 262 default 0x60003000 if !MMU 263 default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 264 default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 265 help 266 This is the address where the kernel is loaded. 267 It is virtual address for MMUv2 configurations and physical address 268 for all other configurations. 269 270 If unsure, leave the default value here. 271 272config VECTORS_OFFSET 273 hex "Kernel vectors offset" 274 default 0x00003000 275 help 276 This is the offset of the kernel image from the relocatable vectors 277 base. 278 279 If unsure, leave the default value here. 280 281choice 282 prompt "KSEG layout" 283 depends on MMU 284 default XTENSA_KSEG_MMU_V2 285 286config XTENSA_KSEG_MMU_V2 287 bool "MMUv2: 128MB cached + 128MB uncached" 288 help 289 MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting 290 at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000 291 without cache. 292 KSEG_PADDR must be aligned to 128MB. 293 294config XTENSA_KSEG_256M 295 bool "256MB cached + 256MB uncached" 296 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 297 help 298 TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000 299 with cache and to 0xc0000000 without cache. 300 KSEG_PADDR must be aligned to 256MB. 301 302config XTENSA_KSEG_512M 303 bool "512MB cached + 512MB uncached" 304 depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 305 help 306 TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000 307 with cache and to 0xc0000000 without cache. 308 KSEG_PADDR must be aligned to 256MB. 309 310endchoice 311 312config HIGHMEM 313 bool "High Memory Support" 314 depends on MMU 315 help 316 Linux can use the full amount of RAM in the system by 317 default. However, the default MMUv2 setup only maps the 318 lowermost 128 MB of memory linearly to the areas starting 319 at 0xd0000000 (cached) and 0xd8000000 (uncached). 320 When there are more than 128 MB memory in the system not 321 all of it can be "permanently mapped" by the kernel. 322 The physical memory that's not permanently mapped is called 323 "high memory". 324 325 If you are compiling a kernel which will never run on a 326 machine with more than 128 MB total physical RAM, answer 327 N here. 328 329 If unsure, say Y. 330 331config FAST_SYSCALL_XTENSA 332 bool "Enable fast atomic syscalls" 333 default n 334 help 335 fast_syscall_xtensa is a syscall that can make atomic operations 336 on UP kernel when processor has no s32c1i support. 337 338 This syscall is deprecated. It may have issues when called with 339 invalid arguments. It is provided only for backwards compatibility. 340 Only enable it if your userspace software requires it. 341 342 If unsure, say N. 343 344config FAST_SYSCALL_SPILL_REGISTERS 345 bool "Enable spill registers syscall" 346 default n 347 help 348 fast_syscall_spill_registers is a syscall that spills all active 349 register windows of a calling userspace task onto its stack. 350 351 This syscall is deprecated. It may have issues when called with 352 invalid arguments. It is provided only for backwards compatibility. 353 Only enable it if your userspace software requires it. 354 355 If unsure, say N. 356 357endmenu 358 359config XTENSA_CALIBRATE_CCOUNT 360 def_bool n 361 help 362 On some platforms (XT2000, for example), the CPU clock rate can 363 vary. The frequency can be determined, however, by measuring 364 against a well known, fixed frequency, such as an UART oscillator. 365 366config SERIAL_CONSOLE 367 def_bool n 368 369menu "Bus options" 370 371config PCI 372 bool "PCI support" 373 default y 374 help 375 Find out whether you have a PCI motherboard. PCI is the name of a 376 bus system, i.e. the way the CPU talks to the other stuff inside 377 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 378 VESA. If you have PCI, say Y, otherwise N. 379 380source "drivers/pci/Kconfig" 381 382endmenu 383 384menu "Platform options" 385 386choice 387 prompt "Xtensa System Type" 388 default XTENSA_PLATFORM_ISS 389 390config XTENSA_PLATFORM_ISS 391 bool "ISS" 392 select XTENSA_CALIBRATE_CCOUNT 393 select SERIAL_CONSOLE 394 help 395 ISS is an acronym for Tensilica's Instruction Set Simulator. 396 397config XTENSA_PLATFORM_XT2000 398 bool "XT2000" 399 select HAVE_IDE 400 help 401 XT2000 is the name of Tensilica's feature-rich emulation platform. 402 This hardware is capable of running a full Linux distribution. 403 404config XTENSA_PLATFORM_XTFPGA 405 bool "XTFPGA" 406 select ETHOC if ETHERNET 407 select PLATFORM_WANT_DEFAULT_MEM if !MMU 408 select SERIAL_CONSOLE 409 select XTENSA_CALIBRATE_CCOUNT 410 help 411 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605). 412 This hardware is capable of running a full Linux distribution. 413 414endchoice 415 416 417config XTENSA_CPU_CLOCK 418 int "CPU clock rate [MHz]" 419 depends on !XTENSA_CALIBRATE_CCOUNT 420 default 16 421 422config GENERIC_CALIBRATE_DELAY 423 bool "Auto calibration of the BogoMIPS value" 424 help 425 The BogoMIPS value can easily be derived from the CPU frequency. 426 427config CMDLINE_BOOL 428 bool "Default bootloader kernel arguments" 429 430config CMDLINE 431 string "Initial kernel command string" 432 depends on CMDLINE_BOOL 433 default "console=ttyS0,38400 root=/dev/ram" 434 help 435 On some architectures (EBSA110 and CATS), there is currently no way 436 for the boot loader to pass arguments to the kernel. For these 437 architectures, you should supply some command-line options at build 438 time by entering them here. As a minimum, you should specify the 439 memory size and the root device (e.g., mem=64M root=/dev/nfs). 440 441config USE_OF 442 bool "Flattened Device Tree support" 443 select OF 444 select OF_EARLY_FLATTREE 445 select OF_RESERVED_MEM 446 help 447 Include support for flattened device tree machine descriptions. 448 449config BUILTIN_DTB 450 string "DTB to build into the kernel image" 451 depends on OF 452 453config BLK_DEV_SIMDISK 454 tristate "Host file-based simulated block device support" 455 default n 456 depends on XTENSA_PLATFORM_ISS && BLOCK 457 help 458 Create block devices that map to files in the host file system. 459 Device binding to host file may be changed at runtime via proc 460 interface provided the device is not in use. 461 462config BLK_DEV_SIMDISK_COUNT 463 int "Number of host file-based simulated block devices" 464 range 1 10 465 depends on BLK_DEV_SIMDISK 466 default 2 467 help 468 This is the default minimal number of created block devices. 469 Kernel/module parameter 'simdisk_count' may be used to change this 470 value at runtime. More file names (but no more than 10) may be 471 specified as parameters, simdisk_count grows accordingly. 472 473config SIMDISK0_FILENAME 474 string "Host filename for the first simulated device" 475 depends on BLK_DEV_SIMDISK = y 476 default "" 477 help 478 Attach a first simdisk to a host file. Conventionally, this file 479 contains a root file system. 480 481config SIMDISK1_FILENAME 482 string "Host filename for the second simulated device" 483 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1 484 default "" 485 help 486 Another simulated disk in a host file for a buildroot-independent 487 storage. 488 489source "mm/Kconfig" 490 491config FORCE_MAX_ZONEORDER 492 int "Maximum zone order" 493 default "11" 494 help 495 The kernel memory allocator divides physically contiguous memory 496 blocks into "zones", where each zone is a power of two number of 497 pages. This option selects the largest power of two that the kernel 498 keeps in the memory allocator. If you need to allocate very large 499 blocks of physically contiguous memory, then you may need to 500 increase this value. 501 502 This config option is actually maximum order plus one. For example, 503 a value of 11 means that the largest free memory block is 2^10 pages. 504 505source "drivers/pcmcia/Kconfig" 506 507config PLATFORM_WANT_DEFAULT_MEM 508 def_bool n 509 510config DEFAULT_MEM_START 511 hex "Physical address of the default memory area start" 512 depends on PLATFORM_WANT_DEFAULT_MEM 513 default 0x00000000 if MMU 514 default 0x60000000 if !MMU 515 help 516 This is the base address of the default memory area. 517 Default memory area has platform-specific meaning, it may be used 518 for e.g. early cache initialization. 519 520 If unsure, leave the default value here. 521 522config DEFAULT_MEM_SIZE 523 hex "Maximal size of the default memory area" 524 depends on PLATFORM_WANT_DEFAULT_MEM 525 default 0x04000000 526 help 527 This is the size of the default memory area. 528 Default memory area has platform-specific meaning, it may be used 529 for e.g. early cache initialization. 530 531 If unsure, leave the default value here. 532 533config XTFPGA_LCD 534 bool "Enable XTFPGA LCD driver" 535 depends on XTENSA_PLATFORM_XTFPGA 536 default n 537 help 538 There's a 2x16 LCD on most of XTFPGA boards, kernel may output 539 progress messages there during bootup/shutdown. It may be useful 540 during board bringup. 541 542 If unsure, say N. 543 544config XTFPGA_LCD_BASE_ADDR 545 hex "XTFPGA LCD base address" 546 depends on XTFPGA_LCD 547 default "0x0d0c0000" 548 help 549 Base address of the LCD controller inside KIO region. 550 Different boards from XTFPGA family have LCD controller at different 551 addresses. Please consult prototyping user guide for your board for 552 the correct address. Wrong address here may lead to hardware lockup. 553 554config XTFPGA_LCD_8BIT_ACCESS 555 bool "Use 8-bit access to XTFPGA LCD" 556 depends on XTFPGA_LCD 557 default n 558 help 559 LCD may be connected with 4- or 8-bit interface, 8-bit access may 560 only be used with 8-bit interface. Please consult prototyping user 561 guide for your board for the correct interface width. 562 563endmenu 564 565menu "Executable file formats" 566 567source "fs/Kconfig.binfmt" 568 569endmenu 570 571menu "Power management options" 572 573source "kernel/power/Kconfig" 574 575endmenu 576 577source "net/Kconfig" 578 579source "drivers/Kconfig" 580 581source "fs/Kconfig" 582 583source "arch/xtensa/Kconfig.debug" 584 585source "security/Kconfig" 586 587source "crypto/Kconfig" 588 589source "lib/Kconfig" 590 591 592