arch/xtensa/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 config ZONE_DMA
   3         def_bool y
   4
   5 config 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
  42 config RWSEM_XCHGADD_ALGORITHM
  43         def_bool y
  44
  45 config GENERIC_HWEIGHT
  46         def_bool y
  47
  48 config ARCH_HAS_ILOG2_U32
  49         def_bool n
  50
  51 config ARCH_HAS_ILOG2_U64
  52         def_bool n
  53
  54 config NO_IOPORT_MAP
  55         def_bool n
  56
  57 config HZ
  58         int
  59         default 100
  60
  61 source "init/Kconfig"
  62 source "kernel/Kconfig.freezer"
  63
  64 config LOCKDEP_SUPPORT
  65         def_bool y
  66
  67 config STACKTRACE_SUPPORT
  68         def_bool y
  69
  70 config TRACE_IRQFLAGS_SUPPORT
  71         def_bool y
  72
  73 config MMU
  74         def_bool n
  75
  76 config VARIANT_IRQ_SWITCH
  77         def_bool n
  78
  79 config HAVE_XTENSA_GPIO32
  80         def_bool n
  81
  82 menu "Processor type and features"
  83
  84 choice
  85         prompt "Xtensa Processor Configuration"
  86         default XTENSA_VARIANT_FSF
  87
  88 config XTENSA_VARIANT_FSF
  89         bool "fsf - default (not generic) configuration"
  90         select MMU
  91
  92 config 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
  99 config 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
 106 config 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.
 112 endchoice
 113
 114 config 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
 122 config 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
 129 config 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
 138 config 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
 148 config 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
 164 config 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
 173 source "kernel/Kconfig.preempt"
 174
 175 config 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
 193 config 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
 201 config NR_CPUS
 202         depends on SMP
 203         int "Maximum number of CPUs (2-32)"
 204         range 2 32
 205         default "4"
 206
 207 config 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
 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
 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
 246 config 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
 259 config 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
 271 config 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
 280 choice
 281         prompt "KSEG layout"
 282         depends on MMU
 283         default XTENSA_KSEG_MMU_V2
 284
 285 config 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
 293 config 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
 301 config 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
 309 endchoice
 310
 311 config 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
 330 config 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
 343 config 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
 356 endmenu
 357
 358 config 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
 365 config SERIAL_CONSOLE
 366         def_bool n
 367
 368 menu "Bus options"
 369
 370 config 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
 379 source "drivers/pci/Kconfig"
 380
 381 endmenu
 382
 383 menu "Platform options"
 384
 385 choice
 386         prompt "Xtensa System Type"
 387         default XTENSA_PLATFORM_ISS
 388
 389 config 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
 396 config 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
 403 config 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
 413 endchoice
 414
 415
 416 config XTENSA_CPU_CLOCK
 417         int "CPU clock rate [MHz]"
 418         depends on !XTENSA_CALIBRATE_CCOUNT
 419         default 16
 420
 421 config 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
 426 config CMDLINE_BOOL
 427         bool "Default bootloader kernel arguments"
 428
 429 config 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
 440 config 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
 448 config BUILTIN_DTB
 449         string "DTB to build into the kernel image"
 450         depends on OF
 451
 452 config 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
 461 config 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
 472 config 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
 480 config 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
 488 source "mm/Kconfig"
 489
 490 config 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
 504 source "drivers/pcmcia/Kconfig"
 505
 506 config PLATFORM_WANT_DEFAULT_MEM
 507         def_bool n
 508
 509 config 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
 521 config 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
 532 config 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
 543 config 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
 553 config 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
 562 endmenu
 563
 564 menu "Executable file formats"
 565
 566 source "fs/Kconfig.binfmt"
 567
 568 endmenu
 569
 570 menu "Power management options"
 571
 572 source "kernel/power/Kconfig"
 573
 574 endmenu
 575
 576 source "net/Kconfig"
 577
 578 source "drivers/Kconfig"
 579
 580 source "fs/Kconfig"
 581
 582 source "arch/xtensa/Kconfig.debug"
 583
 584 source "security/Kconfig"
 585
 586 source "crypto/Kconfig"
 587
 588 source "lib/Kconfig"
 589
 590