arch/xtensa/Kconfig

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