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