arch/xtensa/Kconfig

   1 config ZONE_DMA
   2         def_bool y
   3
   4 config XTENSA
   5         def_bool y
   6         select ARCH_NO_COHERENT_DMA_MMAP if !MMU
   7         select ARCH_WANT_FRAME_POINTERS
   8         select ARCH_WANT_IPC_PARSE_VERSION
   9         select BUILDTIME_EXTABLE_SORT
  10         select CLONE_BACKWARDS
  11         select COMMON_CLK
  12         select GENERIC_ATOMIC64
  13         select GENERIC_CLOCKEVENTS
  14         select GENERIC_IRQ_SHOW
  15         select GENERIC_PCI_IOMAP
  16         select GENERIC_SCHED_CLOCK
  17         select HAVE_DEBUG_KMEMLEAK
  18         select HAVE_DMA_API_DEBUG
  19         select HAVE_DMA_CONTIGUOUS
  20         select HAVE_EXIT_THREAD
  21         select HAVE_FUNCTION_TRACER
  22         select HAVE_FUTEX_CMPXCHG if !MMU
  23         select HAVE_HW_BREAKPOINT if PERF_EVENTS
  24         select HAVE_IRQ_TIME_ACCOUNTING
  25         select HAVE_MEMBLOCK
  26         select HAVE_OPROFILE
  27         select HAVE_PERF_EVENTS
  28         select IRQ_DOMAIN
  29         select MODULES_USE_ELF_RELA
  30         select NO_BOOTMEM
  31         select PERF_USE_VMALLOC
  32         select VIRT_TO_BUS
  33         help
  34           Xtensa processors are 32-bit RISC machines designed by Tensilica
  35           primarily for embedded systems.  These processors are both
  36           configurable and extensible.  The Linux port to the Xtensa
  37           architecture supports all processor configurations and extensions,
  38           with reasonable minimum requirements.  The Xtensa Linux project has
  39           a home page at <http://www.linux-xtensa.org/>.
  40
  41 config RWSEM_XCHGADD_ALGORITHM
  42         def_bool y
  43
  44 config GENERIC_HWEIGHT
  45         def_bool y
  46
  47 config ARCH_HAS_ILOG2_U32
  48         def_bool n
  49
  50 config ARCH_HAS_ILOG2_U64
  51         def_bool n
  52
  53 config NO_IOPORT_MAP
  54         def_bool n
  55
  56 config HZ
  57         int
  58         default 100
  59
  60 source "init/Kconfig"
  61 source "kernel/Kconfig.freezer"
  62
  63 config LOCKDEP_SUPPORT
  64         def_bool y
  65
  66 config STACKTRACE_SUPPORT
  67         def_bool y
  68
  69 config TRACE_IRQFLAGS_SUPPORT
  70         def_bool y
  71
  72 config MMU
  73         def_bool n
  74
  75 config VARIANT_IRQ_SWITCH
  76         def_bool n
  77
  78 config HAVE_XTENSA_GPIO32
  79         def_bool n
  80
  81 menu "Processor type and features"
  82
  83 choice
  84         prompt "Xtensa Processor Configuration"
  85         default XTENSA_VARIANT_FSF
  86
  87 config XTENSA_VARIANT_FSF
  88         bool "fsf - default (not generic) configuration"
  89         select MMU
  90
  91 config XTENSA_VARIANT_DC232B
  92         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
  93         select MMU
  94         select HAVE_XTENSA_GPIO32
  95         help
  96           This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
  97
  98 config XTENSA_VARIANT_DC233C
  99         bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
 100         select MMU
 101         select HAVE_XTENSA_GPIO32
 102         help
 103           This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
 104
 105 config XTENSA_VARIANT_CUSTOM
 106         bool "Custom Xtensa processor configuration"
 107         select HAVE_XTENSA_GPIO32
 108         help
 109           Select this variant to use a custom Xtensa processor configuration.
 110           You will be prompted for a processor variant CORENAME.
 111 endchoice
 112
 113 config XTENSA_VARIANT_CUSTOM_NAME
 114         string "Xtensa Processor Custom Core Variant Name"
 115         depends on XTENSA_VARIANT_CUSTOM
 116         help
 117           Provide the name of a custom Xtensa processor variant.
 118           This CORENAME selects arch/xtensa/variant/CORENAME.
 119           Dont forget you have to select MMU if you have one.
 120
 121 config XTENSA_VARIANT_NAME
 122         string
 123         default "dc232b"                        if XTENSA_VARIANT_DC232B
 124         default "dc233c"                        if XTENSA_VARIANT_DC233C
 125         default "fsf"                           if XTENSA_VARIANT_FSF
 126         default XTENSA_VARIANT_CUSTOM_NAME      if XTENSA_VARIANT_CUSTOM
 127
 128 config XTENSA_VARIANT_MMU
 129         bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)"
 130         depends on XTENSA_VARIANT_CUSTOM
 131         default y
 132         select MMU
 133         help
 134           Build a Conventional Kernel with full MMU support,
 135           ie: it supports a TLB with auto-loading, page protection.
 136
 137 config XTENSA_VARIANT_HAVE_PERF_EVENTS
 138         bool "Core variant has Performance Monitor Module"
 139         depends on XTENSA_VARIANT_CUSTOM
 140         default n
 141         help
 142           Enable if core variant has Performance Monitor Module with
 143           External Registers Interface.
 144
 145           If unsure, say N.
 146
 147 config XTENSA_FAKE_NMI
 148         bool "Treat PMM IRQ as NMI"
 149         depends on XTENSA_VARIANT_HAVE_PERF_EVENTS
 150         default n
 151         help
 152           If PMM IRQ is the only IRQ at EXCM level it is safe to
 153           treat it as NMI, which improves accuracy of profiling.
 154
 155           If there are other interrupts at or above PMM IRQ priority level
 156           but not above the EXCM level, PMM IRQ still may be treated as NMI,
 157           but only if these IRQs are not used. There will be a build warning
 158           saying that this is not safe, and a bugcheck if one of these IRQs
 159           actually fire.
 160
 161           If unsure, say N.
 162
 163 config XTENSA_UNALIGNED_USER
 164         bool "Unaligned memory access in use space"
 165         help
 166           The Xtensa architecture currently does not handle unaligned
 167           memory accesses in hardware but through an exception handler.
 168           Per default, unaligned memory accesses are disabled in user space.
 169
 170           Say Y here to enable unaligned memory access in user space.
 171
 172 source "kernel/Kconfig.preempt"
 173
 174 config HAVE_SMP
 175         bool "System Supports SMP (MX)"
 176         depends on XTENSA_VARIANT_CUSTOM
 177         select XTENSA_MX
 178         help
 179           This option is use to indicate that the system-on-a-chip (SOC)
 180           supports Multiprocessing. Multiprocessor support implemented above
 181           the CPU core definition and currently needs to be selected manually.
 182
 183           Multiprocessor support in implemented with external cache and
 184           interrupt controllers.
 185
 186           The MX interrupt distributer adds Interprocessor Interrupts
 187           and causes the IRQ numbers to be increased by 4 for devices
 188           like the open cores ethernet driver and the serial interface.
 189
 190           You still have to select "Enable SMP" to enable SMP on this SOC.
 191
 192 config SMP
 193         bool "Enable Symmetric multi-processing support"
 194         depends on HAVE_SMP
 195         select GENERIC_SMP_IDLE_THREAD
 196         help
 197           Enabled SMP Software; allows more than one CPU/CORE
 198           to be activated during startup.
 199
 200 config NR_CPUS
 201         depends on SMP
 202         int "Maximum number of CPUs (2-32)"
 203         range 2 32
 204         default "4"
 205
 206 config HOTPLUG_CPU
 207         bool "Enable CPU hotplug support"
 208         depends on SMP
 209         help
 210           Say Y here to allow turning CPUs off and on. CPUs can be
 211           controlled through /sys/devices/system/cpu.
 212
 213           Say N if you want to disable CPU hotplug.
 214
 215 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 216         bool "Initialize Xtensa MMU inside the Linux kernel code"
 217         depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B
 218         default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM
 219         help
 220           Earlier version initialized the MMU in the exception vector
 221           before jumping to _startup in head.S and had an advantage that
 222           it was possible to place a software breakpoint at 'reset' and
 223           then enter your normal kernel breakpoints once the MMU was mapped
 224           to the kernel mappings (0XC0000000).
 225
 226           This unfortunately doesn't work for U-Boot and likley also wont
 227           work for using KEXEC to have a hot kernel ready for doing a
 228           KDUMP.
 229
 230           So now the MMU is initialized in head.S but it's necessary to
 231           use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
 232           xt-gdb can't place a Software Breakpoint in the  0XD region prior
 233           to mapping the MMU and after mapping even if the area of low memory
 234           was mapped gdb wouldn't remove the breakpoint on hitting it as the
 235           PC wouldn't match. Since Hardware Breakpoints are recommended for
 236           Linux configurations it seems reasonable to just assume they exist
 237           and leave this older mechanism for unfortunate souls that choose
 238           not to follow Tensilica's recommendation.
 239
 240           Selecting this will cause U-Boot to set the KERNEL Load and Entry
 241           address at 0x00003000 instead of the mapped std of 0xD0003000.
 242
 243           If in doubt, say Y.
 244
 245 config KSEG_PADDR
 246         hex "Physical address of the KSEG mapping"
 247         depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
 248         default 0x00000000
 249         help
 250           This is the physical address where KSEG is mapped. Please refer to
 251           the chosen KSEG layout help for the required address alignment.
 252           Unpacked kernel image (including vectors) must be located completely
 253           within KSEG.
 254           Physical memory below this address is not available to linux.
 255
 256           If unsure, leave the default value here.
 257
 258 config KERNEL_LOAD_ADDRESS
 259         hex "Kernel load address"
 260         default 0x60003000 if !MMU
 261         default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 262         default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 263         help
 264           This is the address where the kernel is loaded.
 265           It is virtual address for MMUv2 configurations and physical address
 266           for all other configurations.
 267
 268           If unsure, leave the default value here.
 269
 270 config VECTORS_OFFSET
 271         hex "Kernel vectors offset"
 272         default 0x00003000
 273         help
 274           This is the offset of the kernel image from the relocatable vectors
 275           base.
 276
 277           If unsure, leave the default value here.
 278
 279 choice
 280         prompt "KSEG layout"
 281         depends on MMU
 282         default XTENSA_KSEG_MMU_V2
 283
 284 config XTENSA_KSEG_MMU_V2
 285         bool "MMUv2: 128MB cached + 128MB uncached"
 286         help
 287           MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
 288           at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
 289           without cache.
 290           KSEG_PADDR must be aligned to 128MB.
 291
 292 config XTENSA_KSEG_256M
 293         bool "256MB cached + 256MB uncached"
 294         depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 295         help
 296           TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
 297           with cache and to 0xc0000000 without cache.
 298           KSEG_PADDR must be aligned to 256MB.
 299
 300 config XTENSA_KSEG_512M
 301         bool "512MB cached + 512MB uncached"
 302         depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
 303         help
 304           TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
 305           with cache and to 0xc0000000 without cache.
 306           KSEG_PADDR must be aligned to 256MB.
 307
 308 endchoice
 309
 310 config HIGHMEM
 311         bool "High Memory Support"
 312         depends on MMU
 313         help
 314           Linux can use the full amount of RAM in the system by
 315           default. However, the default MMUv2 setup only maps the
 316           lowermost 128 MB of memory linearly to the areas starting
 317           at 0xd0000000 (cached) and 0xd8000000 (uncached).
 318           When there are more than 128 MB memory in the system not
 319           all of it can be "permanently mapped" by the kernel.
 320           The physical memory that's not permanently mapped is called
 321           "high memory".
 322
 323           If you are compiling a kernel which will never run on a
 324           machine with more than 128 MB total physical RAM, answer
 325           N here.
 326
 327           If unsure, say Y.
 328
 329 config FAST_SYSCALL_XTENSA
 330         bool "Enable fast atomic syscalls"
 331         default n
 332         help
 333           fast_syscall_xtensa is a syscall that can make atomic operations
 334           on UP kernel when processor has no s32c1i support.
 335
 336           This syscall is deprecated. It may have issues when called with
 337           invalid arguments. It is provided only for backwards compatibility.
 338           Only enable it if your userspace software requires it.
 339
 340           If unsure, say N.
 341
 342 config FAST_SYSCALL_SPILL_REGISTERS
 343         bool "Enable spill registers syscall"
 344         default n
 345         help
 346           fast_syscall_spill_registers is a syscall that spills all active
 347           register windows of a calling userspace task onto its stack.
 348
 349           This syscall is deprecated. It may have issues when called with
 350           invalid arguments. It is provided only for backwards compatibility.
 351           Only enable it if your userspace software requires it.
 352
 353           If unsure, say N.
 354
 355 endmenu
 356
 357 config XTENSA_CALIBRATE_CCOUNT
 358         def_bool n
 359         help
 360           On some platforms (XT2000, for example), the CPU clock rate can
 361           vary.  The frequency can be determined, however, by measuring
 362           against a well known, fixed frequency, such as an UART oscillator.
 363
 364 config SERIAL_CONSOLE
 365         def_bool n
 366
 367 menu "Bus options"
 368
 369 config PCI
 370         bool "PCI support"
 371         default y
 372         help
 373           Find out whether you have a PCI motherboard. PCI is the name of a
 374           bus system, i.e. the way the CPU talks to the other stuff inside
 375           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
 376           VESA. If you have PCI, say Y, otherwise N.
 377
 378 source "drivers/pci/Kconfig"
 379
 380 endmenu
 381
 382 menu "Platform options"
 383
 384 choice
 385         prompt "Xtensa System Type"
 386         default XTENSA_PLATFORM_ISS
 387
 388 config XTENSA_PLATFORM_ISS
 389         bool "ISS"
 390         select XTENSA_CALIBRATE_CCOUNT
 391         select SERIAL_CONSOLE
 392         help
 393           ISS is an acronym for Tensilica's Instruction Set Simulator.
 394
 395 config XTENSA_PLATFORM_XT2000
 396         bool "XT2000"
 397         select HAVE_IDE
 398         help
 399           XT2000 is the name of Tensilica's feature-rich emulation platform.
 400           This hardware is capable of running a full Linux distribution.
 401
 402 config XTENSA_PLATFORM_XTFPGA
 403         bool "XTFPGA"
 404         select ETHOC if ETHERNET
 405         select PLATFORM_WANT_DEFAULT_MEM if !MMU
 406         select SERIAL_CONSOLE
 407         select XTENSA_CALIBRATE_CCOUNT
 408         help
 409           XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
 410           This hardware is capable of running a full Linux distribution.
 411
 412 endchoice
 413
 414
 415 config XTENSA_CPU_CLOCK
 416         int "CPU clock rate [MHz]"
 417         depends on !XTENSA_CALIBRATE_CCOUNT
 418         default 16
 419
 420 config GENERIC_CALIBRATE_DELAY
 421         bool "Auto calibration of the BogoMIPS value"
 422         help
 423           The BogoMIPS value can easily be derived from the CPU frequency.
 424
 425 config CMDLINE_BOOL
 426         bool "Default bootloader kernel arguments"
 427
 428 config CMDLINE
 429         string "Initial kernel command string"
 430         depends on CMDLINE_BOOL
 431         default "console=ttyS0,38400 root=/dev/ram"
 432         help
 433           On some architectures (EBSA110 and CATS), there is currently no way
 434           for the boot loader to pass arguments to the kernel. For these
 435           architectures, you should supply some command-line options at build
 436           time by entering them here. As a minimum, you should specify the
 437           memory size and the root device (e.g., mem=64M root=/dev/nfs).
 438
 439 config USE_OF
 440         bool "Flattened Device Tree support"
 441         select OF
 442         select OF_EARLY_FLATTREE
 443         select OF_RESERVED_MEM
 444         help
 445           Include support for flattened device tree machine descriptions.
 446
 447 config BUILTIN_DTB
 448         string "DTB to build into the kernel image"
 449         depends on OF
 450
 451 config BLK_DEV_SIMDISK
 452         tristate "Host file-based simulated block device support"
 453         default n
 454         depends on XTENSA_PLATFORM_ISS && BLOCK
 455         help
 456           Create block devices that map to files in the host file system.
 457           Device binding to host file may be changed at runtime via proc
 458           interface provided the device is not in use.
 459
 460 config BLK_DEV_SIMDISK_COUNT
 461         int "Number of host file-based simulated block devices"
 462         range 1 10
 463         depends on BLK_DEV_SIMDISK
 464         default 2
 465         help
 466           This is the default minimal number of created block devices.
 467           Kernel/module parameter 'simdisk_count' may be used to change this
 468           value at runtime. More file names (but no more than 10) may be
 469           specified as parameters, simdisk_count grows accordingly.
 470
 471 config SIMDISK0_FILENAME
 472         string "Host filename for the first simulated device"
 473         depends on BLK_DEV_SIMDISK = y
 474         default ""
 475         help
 476           Attach a first simdisk to a host file. Conventionally, this file
 477           contains a root file system.
 478
 479 config SIMDISK1_FILENAME
 480         string "Host filename for the second simulated device"
 481         depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
 482         default ""
 483         help
 484           Another simulated disk in a host file for a buildroot-independent
 485           storage.
 486
 487 source "mm/Kconfig"
 488
 489 config FORCE_MAX_ZONEORDER
 490         int "Maximum zone order"
 491         default "11"
 492         help
 493           The kernel memory allocator divides physically contiguous memory
 494           blocks into "zones", where each zone is a power of two number of
 495           pages.  This option selects the largest power of two that the kernel
 496           keeps in the memory allocator.  If you need to allocate very large
 497           blocks of physically contiguous memory, then you may need to
 498           increase this value.
 499
 500           This config option is actually maximum order plus one. For example,
 501           a value of 11 means that the largest free memory block is 2^10 pages.
 502
 503 source "drivers/pcmcia/Kconfig"
 504
 505 config PLATFORM_WANT_DEFAULT_MEM
 506         def_bool n
 507
 508 config DEFAULT_MEM_START
 509         hex "Physical address of the default memory area start"
 510         depends on PLATFORM_WANT_DEFAULT_MEM
 511         default 0x00000000 if MMU
 512         default 0x60000000 if !MMU
 513         help
 514           This is the base address of the default memory area.
 515           Default memory area has platform-specific meaning, it may be used
 516           for e.g. early cache initialization.
 517
 518           If unsure, leave the default value here.
 519
 520 config DEFAULT_MEM_SIZE
 521         hex "Maximal size of the default memory area"
 522         depends on PLATFORM_WANT_DEFAULT_MEM
 523         default 0x04000000
 524         help
 525           This is the size of the default memory area.
 526           Default memory area has platform-specific meaning, it may be used
 527           for e.g. early cache initialization.
 528
 529           If unsure, leave the default value here.
 530
 531 config XTFPGA_LCD
 532         bool "Enable XTFPGA LCD driver"
 533         depends on XTENSA_PLATFORM_XTFPGA
 534         default n
 535         help
 536           There's a 2x16 LCD on most of XTFPGA boards, kernel may output
 537           progress messages there during bootup/shutdown. It may be useful
 538           during board bringup.
 539
 540           If unsure, say N.
 541
 542 config XTFPGA_LCD_BASE_ADDR
 543         hex "XTFPGA LCD base address"
 544         depends on XTFPGA_LCD
 545         default "0x0d0c0000"
 546         help
 547           Base address of the LCD controller inside KIO region.
 548           Different boards from XTFPGA family have LCD controller at different
 549           addresses. Please consult prototyping user guide for your board for
 550           the correct address. Wrong address here may lead to hardware lockup.
 551
 552 config XTFPGA_LCD_8BIT_ACCESS
 553         bool "Use 8-bit access to XTFPGA LCD"
 554         depends on XTFPGA_LCD
 555         default n
 556         help
 557           LCD may be connected with 4- or 8-bit interface, 8-bit access may
 558           only be used with 8-bit interface. Please consult prototyping user
 559           guide for your board for the correct interface width.
 560
 561 endmenu
 562
 563 menu "Executable file formats"
 564
 565 source "fs/Kconfig.binfmt"
 566
 567 endmenu
 568
 569 menu "Power management options"
 570
 571 source "kernel/power/Kconfig"
 572
 573 endmenu
 574
 575 source "net/Kconfig"
 576
 577 source "drivers/Kconfig"
 578
 579 source "fs/Kconfig"
 580
 581 source "arch/xtensa/Kconfig.debug"
 582
 583 source "security/Kconfig"
 584
 585 source "crypto/Kconfig"
 586
 587 source "lib/Kconfig"
 588
 589