arch/arm/Kconfig.debug

   1 menu "Kernel hacking"
   2
   3 source "lib/Kconfig.debug"
   4
   5 config STRICT_DEVMEM
   6         bool "Filter access to /dev/mem"
   7         depends on MMU
   8         ---help---
   9           If this option is disabled, you allow userspace (root) access to all
  10           of memory, including kernel and userspace memory. Accidental
  11           access to this is obviously disastrous, but specific access can
  12           be used by people debugging the kernel.
  13
  14           If this option is switched on, the /dev/mem file only allows
  15           userspace access to memory mapped peripherals.
  16
  17           If in doubt, say Y.
  18
  19 # RMK wants arm kernels compiled with frame pointers or stack unwinding.
  20 # If you know what you are doing and are willing to live without stack
  21 # traces, you can get a slightly smaller kernel by setting this option to
  22 # n, but then RMK will have to kill you ;).
  23 config FRAME_POINTER
  24         bool
  25         depends on !THUMB2_KERNEL
  26         default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
  27         help
  28           If you say N here, the resulting kernel will be slightly smaller and
  29           faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
  30           when a problem occurs with the kernel, the information that is
  31           reported is severely limited.
  32
  33 config ARM_UNWIND
  34         bool "Enable stack unwinding support (EXPERIMENTAL)"
  35         depends on AEABI
  36         default y
  37         help
  38           This option enables stack unwinding support in the kernel
  39           using the information automatically generated by the
  40           compiler. The resulting kernel image is slightly bigger but
  41           the performance is not affected. Currently, this feature
  42           only works with EABI compilers. If unsure say Y.
  43
  44 config OLD_MCOUNT
  45         bool
  46         depends on FUNCTION_TRACER && FRAME_POINTER
  47         default y
  48
  49 config DEBUG_USER
  50         bool "Verbose user fault messages"
  51         help
  52           When a user program crashes due to an exception, the kernel can
  53           print a brief message explaining what the problem was. This is
  54           sometimes helpful for debugging but serves no purpose on a
  55           production system. Most people should say N here.
  56
  57           In addition, you need to pass user_debug=N on the kernel command
  58           line to enable this feature.  N consists of the sum of:
  59
  60               1 - undefined instruction events
  61               2 - system calls
  62               4 - invalid data aborts
  63               8 - SIGSEGV faults
  64              16 - SIGBUS faults
  65
  66 # These options are only for real kernel hackers who want to get their hands dirty.
  67 config DEBUG_LL
  68         bool "Kernel low-level debugging functions (read help!)"
  69         depends on DEBUG_KERNEL
  70         help
  71           Say Y here to include definitions of printascii, printch, printhex
  72           in the kernel.  This is helpful if you are debugging code that
  73           executes before the console is initialized.
  74
  75           Note that selecting this option will limit the kernel to a single
  76           UART definition, as specified below. Attempting to boot the kernel
  77           image on a different platform *will not work*, so this option should
  78           not be enabled for kernels that are intended to be portable.
  79
  80 choice
  81         prompt "Kernel low-level debugging port"
  82         depends on DEBUG_LL
  83
  84         config AT91_DEBUG_LL_DBGU0
  85                 bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
  86                 depends on HAVE_AT91_DBGU0
  87
  88         config AT91_DEBUG_LL_DBGU1
  89                 bool "Kernel low-level debugging on 9263 and 9g45"
  90                 depends on HAVE_AT91_DBGU1
  91
  92         config DEBUG_BCM2835
  93                 bool "Kernel low-level debugging on BCM2835 PL011 UART"
  94                 depends on ARCH_BCM2835
  95
  96         config DEBUG_CLPS711X_UART1
  97                 bool "Kernel low-level debugging messages via UART1"
  98                 depends on ARCH_CLPS711X
  99                 help
 100                   Say Y here if you want the debug print routines to direct
 101                   their output to the first serial port on these devices.
 102
 103         config DEBUG_CLPS711X_UART2
 104                 bool "Kernel low-level debugging messages via UART2"
 105                 depends on ARCH_CLPS711X
 106                 help
 107                   Say Y here if you want the debug print routines to direct
 108                   their output to the second serial port on these devices.
 109
 110         config DEBUG_CNS3XXX
 111                 bool "Kernel Kernel low-level debugging on Cavium Networks CNS3xxx"
 112                 depends on ARCH_CNS3XXX
 113                 help
 114                   Say Y here if you want the debug print routines to direct
 115                   their output to the CNS3xxx UART0.
 116
 117         config DEBUG_DAVINCI_DA8XX_UART1
 118                 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
 119                 depends on ARCH_DAVINCI_DA8XX
 120                 help
 121                   Say Y here if you want the debug print routines to direct
 122                   their output to UART1 serial port on DaVinci DA8XX devices.
 123
 124         config DEBUG_DAVINCI_DA8XX_UART2
 125                 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
 126                 depends on ARCH_DAVINCI_DA8XX
 127                 help
 128                   Say Y here if you want the debug print routines to direct
 129                   their output to UART2 serial port on DaVinci DA8XX devices.
 130
 131         config DEBUG_DAVINCI_DMx_UART0
 132                 bool "Kernel low-level debugging on DaVinci DMx using UART0"
 133                 depends on ARCH_DAVINCI_DMx
 134                 help
 135                   Say Y here if you want the debug print routines to direct
 136                   their output to UART0 serial port on DaVinci DMx devices.
 137
 138         config DEBUG_DAVINCI_TNETV107X_UART1
 139                 bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
 140                 depends on ARCH_DAVINCI_TNETV107X
 141                 help
 142                   Say Y here if you want the debug print routines to direct
 143                   their output to UART1 serial port on DaVinci TNETV107X
 144                   devices.
 145
 146         config DEBUG_ZYNQ_UART0
 147                 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
 148                 depends on ARCH_ZYNQ
 149                 help
 150                   Say Y here if you want the debug print routines to direct
 151                   their output to UART0 on the Zynq platform.
 152
 153         config DEBUG_ZYNQ_UART1
 154                 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
 155                 depends on ARCH_ZYNQ
 156                 help
 157                   Say Y here if you want the debug print routines to direct
 158                   their output to UART1 on the Zynq platform.
 159
 160                   If you have a ZC702 board and want early boot messages to
 161                   appear on the USB serial adaptor, select this option.
 162
 163         config DEBUG_DC21285_PORT
 164                 bool "Kernel low-level debugging messages via footbridge serial port"
 165                 depends on FOOTBRIDGE
 166                 help
 167                   Say Y here if you want the debug print routines to direct
 168                   their output to the serial port in the DC21285 (Footbridge).
 169
 170         config DEBUG_FOOTBRIDGE_COM1
 171                 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
 172                 depends on FOOTBRIDGE
 173                 help
 174                   Say Y here if you want the debug print routines to direct
 175                   their output to the 8250 at PCI COM1.
 176
 177         config DEBUG_HIGHBANK_UART
 178                 bool "Kernel low-level debugging messages via Highbank UART"
 179                 depends on ARCH_HIGHBANK
 180                 help
 181                   Say Y here if you want the debug print routines to direct
 182                   their output to the UART on Highbank based devices.
 183
 184         config DEBUG_IMX1_UART
 185                 bool "i.MX1 Debug UART"
 186                 depends on SOC_IMX1
 187                 help
 188                   Say Y here if you want kernel low-level debugging support
 189                   on i.MX1.
 190
 191         config DEBUG_IMX23_UART
 192                 bool "i.MX23 Debug UART"
 193                 depends on SOC_IMX23
 194                 help
 195                   Say Y here if you want kernel low-level debugging support
 196                   on i.MX23.
 197
 198         config DEBUG_IMX25_UART
 199                 bool "i.MX25 Debug UART"
 200                 depends on SOC_IMX25
 201                 help
 202                   Say Y here if you want kernel low-level debugging support
 203                   on i.MX25.
 204
 205         config DEBUG_IMX21_IMX27_UART
 206                 bool "i.MX21 and i.MX27 Debug UART"
 207                 depends on SOC_IMX21 || SOC_IMX27
 208                 help
 209                   Say Y here if you want kernel low-level debugging support
 210                   on i.MX21 or i.MX27.
 211
 212         config DEBUG_IMX28_UART
 213                 bool "i.MX28 Debug UART"
 214                 depends on SOC_IMX28
 215                 help
 216                   Say Y here if you want kernel low-level debugging support
 217                   on i.MX28.
 218
 219         config DEBUG_IMX31_UART
 220                 bool "i.MX31 Debug UART"
 221                 depends on SOC_IMX31
 222                 help
 223                   Say Y here if you want kernel low-level debugging support
 224                   on i.MX31.
 225
 226         config DEBUG_IMX35_UART
 227                 bool "i.MX35 Debug UART"
 228                 depends on SOC_IMX35
 229                 help
 230                   Say Y here if you want kernel low-level debugging support
 231                   on i.MX35.
 232
 233         config DEBUG_IMX51_UART
 234                 bool "i.MX51 Debug UART"
 235                 depends on SOC_IMX51
 236                 help
 237                   Say Y here if you want kernel low-level debugging support
 238                   on i.MX51.
 239
 240         config DEBUG_IMX53_UART
 241                 bool "i.MX53 Debug UART"
 242                 depends on SOC_IMX53
 243                 help
 244                   Say Y here if you want kernel low-level debugging support
 245                   on i.MX53.
 246
 247         config DEBUG_IMX6Q_UART
 248                 bool "i.MX6Q/DL Debug UART"
 249                 depends on SOC_IMX6Q
 250                 help
 251                   Say Y here if you want kernel low-level debugging support
 252                   on i.MX6Q/DL.
 253
 254         config DEBUG_IMX6SL_UART
 255                 bool "i.MX6SL Debug UART"
 256                 depends on SOC_IMX6SL
 257                 help
 258                   Say Y here if you want kernel low-level debugging support
 259                   on i.MX6SL.
 260
 261         config DEBUG_KEYSTONE_UART0
 262                 bool "Kernel low-level debugging on KEYSTONE2 using UART0"
 263                 depends on ARCH_KEYSTONE
 264                 help
 265                   Say Y here if you want the debug print routines to direct
 266                   their output to UART0 serial port on KEYSTONE2 devices.
 267
 268         config DEBUG_KEYSTONE_UART1
 269                 bool "Kernel low-level debugging on KEYSTONE2 using UART1"
 270                 depends on ARCH_KEYSTONE
 271                 help
 272                   Say Y here if you want the debug print routines to direct
 273                   their output to UART1 serial port on KEYSTONE2 devices.
 274
 275         config DEBUG_MMP_UART2
 276                 bool "Kernel low-level debugging message via MMP UART2"
 277                 depends on ARCH_MMP
 278                 help
 279                   Say Y here if you want kernel low-level debugging support
 280                   on MMP UART2.
 281
 282         config DEBUG_MMP_UART3
 283                 bool "Kernel low-level debugging message via MMP UART3"
 284                 depends on ARCH_MMP
 285                 help
 286                   Say Y here if you want kernel low-level debugging support
 287                   on MMP UART3.
 288
 289         config DEBUG_MSM_UART1
 290                 bool "Kernel low-level debugging messages via MSM UART1"
 291                 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 292                 help
 293                   Say Y here if you want the debug print routines to direct
 294                   their output to the first serial port on MSM devices.
 295
 296         config DEBUG_MSM_UART2
 297                 bool "Kernel low-level debugging messages via MSM UART2"
 298                 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 299                 help
 300                   Say Y here if you want the debug print routines to direct
 301                   their output to the second serial port on MSM devices.
 302
 303         config DEBUG_MSM_UART3
 304                 bool "Kernel low-level debugging messages via MSM UART3"
 305                 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 306                 help
 307                   Say Y here if you want the debug print routines to direct
 308                   their output to the third serial port on MSM devices.
 309
 310         config DEBUG_MSM8660_UART
 311                 bool "Kernel low-level debugging messages via MSM 8660 UART"
 312                 depends on ARCH_MSM8X60
 313                 select MSM_HAS_DEBUG_UART_HS
 314                 help
 315                   Say Y here if you want the debug print routines to direct
 316                   their output to the serial port on MSM 8660 devices.
 317
 318         config DEBUG_MSM8960_UART
 319                 bool "Kernel low-level debugging messages via MSM 8960 UART"
 320                 depends on ARCH_MSM8960
 321                 select MSM_HAS_DEBUG_UART_HS
 322                 help
 323                   Say Y here if you want the debug print routines to direct
 324                   their output to the serial port on MSM 8960 devices.
 325
 326         config DEBUG_MVEBU_UART
 327                 bool "Kernel low-level debugging messages via MVEBU UART (old bootloaders)"
 328                 depends on ARCH_MVEBU
 329                 help
 330                   Say Y here if you want kernel low-level debugging support
 331                   on MVEBU based platforms.
 332
 333                   This option should be used with the old bootloaders
 334                   that left the internal registers mapped at
 335                   0xd0000000. As of today, this is the case on
 336                   platforms such as the Globalscale Mirabox or the
 337                   Plathome OpenBlocks AX3, when using the original
 338                   bootloader.
 339
 340                   If the wrong DEBUG_MVEBU_UART* option is selected,
 341                   when u-boot hands over to the kernel, the system
 342                   silently crashes, with no serial output at all.
 343
 344         config DEBUG_MVEBU_UART_ALTERNATE
 345                 bool "Kernel low-level debugging messages via MVEBU UART (new bootloaders)"
 346                 depends on ARCH_MVEBU
 347                 help
 348                   Say Y here if you want kernel low-level debugging support
 349                   on MVEBU based platforms.
 350
 351                   This option should be used with the new bootloaders
 352                   that remap the internal registers at 0xf1000000.
 353
 354                   If the wrong DEBUG_MVEBU_UART* option is selected,
 355                   when u-boot hands over to the kernel, the system
 356                   silently crashes, with no serial output at all.
 357
 358         config DEBUG_NOMADIK_UART
 359                 bool "Kernel low-level debugging messages via NOMADIK UART"
 360                 depends on ARCH_NOMADIK
 361                 help
 362                   Say Y here if you want kernel low-level debugging support
 363                   on NOMADIK based platforms.
 364
 365         config DEBUG_NSPIRE_CLASSIC_UART
 366                 bool "Kernel low-level debugging via TI-NSPIRE 8250 UART"
 367                 depends on ARCH_NSPIRE
 368                 help
 369                   Say Y here if you want kernel low-level debugging support
 370                   on TI-NSPIRE classic models.
 371
 372         config DEBUG_NSPIRE_CX_UART
 373                 bool "Kernel low-level debugging via TI-NSPIRE PL011 UART"
 374                 depends on ARCH_NSPIRE
 375                 help
 376                   Say Y here if you want kernel low-level debugging support
 377                   on TI-NSPIRE CX models.
 378
 379         config DEBUG_OMAP2PLUS_UART
 380                 bool "Kernel low-level debugging messages via OMAP2PLUS UART"
 381                 depends on ARCH_OMAP2PLUS
 382                 help
 383                   Say Y here if you want kernel low-level debugging support
 384                   on OMAP2PLUS based platforms.
 385
 386         config DEBUG_PICOXCELL_UART
 387                 depends on ARCH_PICOXCELL
 388                 bool "Use PicoXcell UART for low-level debug"
 389                 help
 390                   Say Y here if you want kernel low-level debugging support
 391                   on PicoXcell based platforms.
 392
 393         config DEBUG_PXA_UART1
 394                 depends on ARCH_PXA
 395                 bool "Use PXA UART1 for low-level debug"
 396                 help
 397                   Say Y here if you want kernel low-level debugging support
 398                   on PXA UART1.
 399
 400         config DEBUG_REALVIEW_STD_PORT
 401                 bool "RealView Default UART"
 402                 depends on ARCH_REALVIEW
 403                 help
 404                   Say Y here if you want the debug print routines to direct
 405                   their output to the serial port on RealView EB, PB11MP, PBA8
 406                   and PBX platforms.
 407
 408         config DEBUG_REALVIEW_PB1176_PORT
 409                 bool "RealView PB1176 UART"
 410                 depends on MACH_REALVIEW_PB1176
 411                 help
 412                   Say Y here if you want the debug print routines to direct
 413                   their output to the standard serial port on the RealView
 414                   PB1176 platform.
 415
 416         config DEBUG_ROCKCHIP_UART
 417                 bool "Kernel low-level debugging messages via Rockchip UART"
 418                 depends on ARCH_ROCKCHIP
 419                 help
 420                   Say Y here if you want kernel low-level debugging support
 421                   on Rockchip based platforms.
 422
 423         config DEBUG_S3C_UART0
 424                 depends on PLAT_SAMSUNG
 425                 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
 426                 bool "Use S3C UART 0 for low-level debug"
 427                 help
 428                   Say Y here if you want the debug print routines to direct
 429                   their output to UART 0. The port must have been initialised
 430                   by the boot-loader before use.
 431
 432                   The uncompressor code port configuration is now handled
 433                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 434
 435         config DEBUG_S3C_UART1
 436                 depends on PLAT_SAMSUNG
 437                 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
 438                 bool "Use S3C UART 1 for low-level debug"
 439                 help
 440                   Say Y here if you want the debug print routines to direct
 441                   their output to UART 1. The port must have been initialised
 442                   by the boot-loader before use.
 443
 444                   The uncompressor code port configuration is now handled
 445                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 446
 447         config DEBUG_S3C_UART2
 448                 depends on PLAT_SAMSUNG
 449                 select DEBUG_EXYNOS_UART if ARCH_EXYNOS
 450                 bool "Use S3C UART 2 for low-level debug"
 451                 help
 452                   Say Y here if you want the debug print routines to direct
 453                   their output to UART 2. The port must have been initialised
 454                   by the boot-loader before use.
 455
 456                   The uncompressor code port configuration is now handled
 457                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 458
 459         config DEBUG_S3C_UART3
 460                 depends on PLAT_SAMSUNG && ARCH_EXYNOS
 461                 select DEBUG_EXYNOS_UART
 462                 bool "Use S3C UART 3 for low-level debug"
 463                 help
 464                   Say Y here if you want the debug print routines to direct
 465                   their output to UART 3. The port must have been initialised
 466                   by the boot-loader before use.
 467
 468                   The uncompressor code port configuration is now handled
 469                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 470
 471         config DEBUG_SOCFPGA_UART
 472                 depends on ARCH_SOCFPGA
 473                 bool "Use SOCFPGA UART for low-level debug"
 474                 help
 475                   Say Y here if you want kernel low-level debugging support
 476                   on SOCFPGA based platforms.
 477
 478         config DEBUG_SUNXI_UART0
 479                 bool "Kernel low-level debugging messages via sunXi UART0"
 480                 depends on ARCH_SUNXI
 481                 help
 482                   Say Y here if you want kernel low-level debugging support
 483                   on Allwinner A1X based platforms on the UART0.
 484
 485         config DEBUG_SUNXI_UART1
 486                 bool "Kernel low-level debugging messages via sunXi UART1"
 487                 depends on ARCH_SUNXI
 488                 help
 489                   Say Y here if you want kernel low-level debugging support
 490                   on Allwinner A1X based platforms on the UART1.
 491
 492         config DEBUG_TEGRA_UART
 493                 depends on ARCH_TEGRA
 494                 bool "Use Tegra UART for low-level debug"
 495                 help
 496                   Say Y here if you want kernel low-level debugging support
 497                   on Tegra based platforms.
 498
 499         config DEBUG_SIRFPRIMA2_UART1
 500                 bool "Kernel low-level debugging messages via SiRFprimaII UART1"
 501                 depends on ARCH_PRIMA2
 502                 help
 503                   Say Y here if you want the debug print routines to direct
 504                   their output to the uart1 port on SiRFprimaII devices.
 505
 506         config DEBUG_SIRFMARCO_UART1
 507                 bool "Kernel low-level debugging messages via SiRFmarco UART1"
 508                 depends on ARCH_MARCO
 509                 help
 510                   Say Y here if you want the debug print routines to direct
 511                   their output to the uart1 port on SiRFmarco devices.
 512
 513         config DEBUG_STI_UART
 514                 depends on ARCH_STI
 515                 bool "Use StiH415/416 ASC for low-level debug"
 516                 help
 517                   Say Y here if you want kernel low-level debugging support
 518                   on StiH415/416 based platforms like B2000, B2020.
 519                   It support UART2 and SBC_UART1.
 520
 521                   If unsure, say N.
 522
 523         config DEBUG_U300_UART
 524                 bool "Kernel low-level debugging messages via U300 UART0"
 525                 depends on ARCH_U300
 526                 help
 527                   Say Y here if you want the debug print routines to direct
 528                   their output to the uart port on U300 devices.
 529
 530         config DEBUG_UX500_UART
 531                 depends on ARCH_U8500
 532                 bool "Use Ux500 UART for low-level debug"
 533                 help
 534                   Say Y here if you want kernel low-level debugging support
 535                   on Ux500 based platforms.
 536
 537         config DEBUG_VEXPRESS_UART0_DETECT
 538                 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
 539                 depends on ARCH_VEXPRESS && CPU_CP15_MMU
 540                 help
 541                   This option enables a simple heuristic which tries to determine
 542                   the motherboard's memory map variant (original or RS1) and then
 543                   choose the relevant UART0 base address.
 544
 545                   Note that this will only work with standard A-class core tiles,
 546                   and may fail with non-standard SMM or custom software models.
 547
 548         config DEBUG_VEXPRESS_UART0_CA9
 549                 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
 550                 depends on ARCH_VEXPRESS
 551                 help
 552                   This option selects UART0 at 0x10009000. Except for custom models,
 553                   this applies only to the V2P-CA9 tile.
 554
 555         config DEBUG_VEXPRESS_UART0_RS1
 556                 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
 557                 depends on ARCH_VEXPRESS
 558                 help
 559                   This option selects UART0 at 0x1c090000. This applies to most
 560                   of the tiles using the RS1 memory map, including all new A-class
 561                   core tiles, FPGA-based SMMs and software models.
 562
 563         config DEBUG_VEXPRESS_UART0_CRX
 564                 bool "Use PL011 UART0 at 0xb0090000 (Cortex-R compliant tiles)"
 565                 depends on ARCH_VEXPRESS && !MMU
 566                 help
 567                   This option selects UART0 at 0xb0090000. This is appropriate for
 568                   Cortex-R series tiles and SMMs, such as Cortex-R5 and Cortex-R7
 569
 570         config DEBUG_VT8500_UART0
 571                 bool "Use UART0 on VIA/Wondermedia SoCs"
 572                 depends on ARCH_VT8500
 573                 help
 574                   This option selects UART0 on VIA/Wondermedia System-on-a-chip
 575                   devices, including VT8500, WM8505, WM8650 and WM8850.
 576
 577         config DEBUG_LL_UART_NONE
 578                 bool "No low-level debugging UART"
 579                 depends on !ARCH_MULTIPLATFORM
 580                 help
 581                   Say Y here if your platform doesn't provide a UART option
 582                   below. This relies on your platform choosing the right UART
 583                   definition internally in order for low-level debugging to
 584                   work.
 585
 586         config DEBUG_ICEDCC
 587                 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
 588                 help
 589                   Say Y here if you want the debug print routines to direct
 590                   their output to the EmbeddedICE macrocell's DCC channel using
 591                   co-processor 14. This is known to work on the ARM9 style ICE
 592                   channel and on the XScale with the PEEDI.
 593
 594                   Note that the system will appear to hang during boot if there
 595                   is nothing connected to read from the DCC.
 596
 597         config DEBUG_SEMIHOSTING
 598                 bool "Kernel low-level debug output via semihosting I/O"
 599                 help
 600                   Semihosting enables code running on an ARM target to use
 601                   the I/O facilities on a host debugger/emulator through a
 602                   simple SVC call. The host debugger or emulator must have
 603                   semihosting enabled for the special svc call to be trapped
 604                   otherwise the kernel will crash.
 605
 606                   This is known to work with OpenOCD, as well as
 607                   ARM's Fast Models, or any other controlling environment
 608                   that implements semihosting.
 609
 610                   For more details about semihosting, please see
 611                   chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
 612
 613 endchoice
 614
 615 config DEBUG_EXYNOS_UART
 616         bool
 617
 618 config DEBUG_IMX_UART_PORT
 619         int "i.MX Debug UART Port Selection" if DEBUG_IMX1_UART || \
 620                                                 DEBUG_IMX25_UART || \
 621                                                 DEBUG_IMX21_IMX27_UART || \
 622                                                 DEBUG_IMX31_UART || \
 623                                                 DEBUG_IMX35_UART || \
 624                                                 DEBUG_IMX51_UART || \
 625                                                 DEBUG_IMX53_UART || \
 626                                                 DEBUG_IMX6Q_UART || \
 627                                                 DEBUG_IMX6SL_UART
 628         default 1
 629         depends on ARCH_MXC
 630         help
 631           Choose UART port on which kernel low-level debug messages
 632           should be output.
 633
 634 choice
 635         prompt "Low-level debug console UART"
 636         depends on DEBUG_OMAP2PLUS_UART
 637
 638         config DEBUG_OMAP2UART1
 639                 bool "OMAP2/3/4 UART1 (omap2/3 sdp boards and some omap3 boards)"
 640                 help
 641                   This covers at least h4, 2430sdp, 3430sdp, 3630sdp,
 642                   omap3 torpedo and 3530 lv som.
 643
 644         config DEBUG_OMAP2UART2
 645                 bool "OMAP2/3/4 UART2"
 646
 647         config DEBUG_OMAP2UART3
 648                 bool "OMAP2 UART3 (n8x0)"
 649
 650         config DEBUG_OMAP3UART3
 651                 bool "OMAP3 UART3 (most omap3 boards)"
 652                 help
 653                   This covers at least cm_t3x, beagle, crane, devkit8000,
 654                   igep00x0, ldp, n900, n9(50), pandora, overo, touchbook,
 655                   and 3517evm.
 656
 657         config DEBUG_OMAP4UART3
 658                 bool "OMAP4/5 UART3 (omap4 blaze, panda, omap5 sevm)"
 659
 660         config DEBUG_OMAP3UART4
 661                 bool "OMAP36XX UART4"
 662
 663         config DEBUG_OMAP4UART4
 664                 bool "OMAP4/5 UART4"
 665
 666         config DEBUG_TI81XXUART1
 667                 bool "TI81XX UART1 (ti8148evm)"
 668
 669         config DEBUG_TI81XXUART2
 670                 bool "TI81XX UART2"
 671
 672         config DEBUG_TI81XXUART3
 673                 bool "TI81XX UART3 (ti8168evm)"
 674
 675         config DEBUG_AM33XXUART1
 676                 bool "AM33XX UART1"
 677
 678         config DEBUG_ZOOM_UART
 679                 bool "Zoom2/3 UART"
 680 endchoice
 681
 682 choice
 683         prompt "Low-level debug console UART"
 684         depends on DEBUG_ROCKCHIP_UART
 685
 686         config DEBUG_RK29_UART0
 687                 bool "RK29 UART0"
 688
 689         config DEBUG_RK29_UART1
 690                 bool "RK29 UART1"
 691
 692         config DEBUG_RK29_UART2
 693                 bool "RK29 UART2"
 694
 695         config DEBUG_RK3X_UART0
 696                 bool "RK3X UART0"
 697
 698         config DEBUG_RK3X_UART1
 699                 bool "RK3X UART1"
 700
 701         config DEBUG_RK3X_UART2
 702                 bool "RK3X UART2"
 703
 704         config DEBUG_RK3X_UART3
 705                 bool "RK3X UART3"
 706 endchoice
 707
 708 choice
 709         prompt "Low-level debug console UART"
 710         depends on DEBUG_LL && DEBUG_TEGRA_UART
 711
 712         config TEGRA_DEBUG_UART_AUTO_ODMDATA
 713         bool "Via ODMDATA"
 714         help
 715           Automatically determines which UART to use for low-level debug based
 716           on the ODMDATA value. This value is part of the BCT, and is written
 717           to the boot memory device using nvflash, or other flashing tool.
 718           When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
 719           0/1/2/3/4 are UART A/B/C/D/E.
 720
 721         config TEGRA_DEBUG_UARTA
 722                 bool "UART A"
 723
 724         config TEGRA_DEBUG_UARTB
 725                 bool "UART B"
 726
 727         config TEGRA_DEBUG_UARTC
 728                 bool "UART C"
 729
 730         config TEGRA_DEBUG_UARTD
 731                 bool "UART D"
 732
 733         config TEGRA_DEBUG_UARTE
 734                 bool "UART E"
 735
 736 endchoice
 737
 738 choice
 739         prompt "Low-level debug console UART"
 740         depends on DEBUG_LL && DEBUG_STI_UART
 741
 742         config STIH41X_DEBUG_ASC2
 743                 bool "ASC2 UART"
 744                 help
 745                   Say Y here if you want kernel low-level debugging support
 746                   on STiH415/416 based platforms like b2000, which has
 747                   default UART wired up to ASC2.
 748
 749                   If unsure, say N.
 750
 751         config STIH41X_DEBUG_SBC_ASC1
 752                 bool "SBC ASC1 UART"
 753                 help
 754                   Say Y here if you want kernel low-level debugging support
 755                   on STiH415/416 based platforms like b2020. which has
 756                   default UART wired up to SBC ASC1.
 757
 758                   If unsure, say N.
 759
 760 endchoice
 761
 762 config DEBUG_LL_INCLUDE
 763         string
 764         default "debug/bcm2835.S" if DEBUG_BCM2835
 765         default "debug/cns3xxx.S" if DEBUG_CNS3XXX
 766         default "debug/exynos.S" if DEBUG_EXYNOS_UART
 767         default "debug/highbank.S" if DEBUG_HIGHBANK_UART
 768         default "debug/icedcc.S" if DEBUG_ICEDCC
 769         default "debug/imx.S" if DEBUG_IMX1_UART || \
 770                                  DEBUG_IMX25_UART || \
 771                                  DEBUG_IMX21_IMX27_UART || \
 772                                  DEBUG_IMX31_UART || \
 773                                  DEBUG_IMX35_UART || \
 774                                  DEBUG_IMX51_UART || \
 775                                  DEBUG_IMX53_UART ||\
 776                                  DEBUG_IMX6Q_UART || \
 777                                  DEBUG_IMX6SL_UART
 778         default "debug/keystone.S" if DEBUG_KEYSTONE_UART0 || \
 779                                       DEBUG_KEYSTONE_UART1
 780         default "debug/mvebu.S" if DEBUG_MVEBU_UART || \
 781                                    DEBUG_MVEBU_UART_ALTERNATE
 782         default "debug/mxs.S" if DEBUG_IMX23_UART || DEBUG_IMX28_UART
 783         default "debug/nomadik.S" if DEBUG_NOMADIK_UART
 784         default "debug/nspire.S" if     DEBUG_NSPIRE_CX_UART || \
 785                                         DEBUG_NSPIRE_CLASSIC_UART
 786         default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
 787         default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
 788         default "debug/pxa.S" if DEBUG_PXA_UART1 || DEBUG_MMP_UART2 || \
 789                                  DEBUG_MMP_UART3
 790         default "debug/rockchip.S" if DEBUG_ROCKCHIP_UART
 791         default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
 792         default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
 793         default "debug/sti.S" if DEBUG_STI_UART
 794         default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
 795         default "debug/tegra.S" if DEBUG_TEGRA_UART
 796         default "debug/u300.S" if DEBUG_U300_UART
 797         default "debug/ux500.S" if DEBUG_UX500_UART
 798         default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
 799                 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1 || \
 800                 DEBUG_VEXPRESS_UART0_CRX
 801         default "debug/vt8500.S" if DEBUG_VT8500_UART0
 802         default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
 803         default "mach/debug-macro.S"
 804
 805 config DEBUG_UNCOMPRESS
 806         bool
 807         default y if ARCH_MULTIPLATFORM && DEBUG_LL && \
 808                      !DEBUG_OMAP2PLUS_UART && \
 809                      !DEBUG_TEGRA_UART
 810
 811 config UNCOMPRESS_INCLUDE
 812         string
 813         default "debug/uncompress.h" if ARCH_MULTIPLATFORM
 814         default "mach/uncompress.h"
 815
 816 config EARLY_PRINTK
 817         bool "Early printk"
 818         depends on DEBUG_LL
 819         help
 820           Say Y here if you want to have an early console using the
 821           kernel low-level debugging functions. Add earlyprintk to your
 822           kernel parameters to enable this console.
 823
 824 config OC_ETM
 825         bool "On-chip ETM and ETB"
 826         depends on ARM_AMBA
 827         help
 828           Enables the on-chip embedded trace macrocell and embedded trace
 829           buffer driver that will allow you to collect traces of the
 830           kernel code.
 831
 832 config ARM_KPROBES_TEST
 833         tristate "Kprobes test module"
 834         depends on KPROBES && MODULES
 835         help
 836           Perform tests of kprobes API and instruction set simulation.
 837
 838 config PID_IN_CONTEXTIDR
 839         bool "Write the current PID to the CONTEXTIDR register"
 840         depends on CPU_COPY_V6
 841         help
 842           Enabling this option causes the kernel to write the current PID to
 843           the PROCID field of the CONTEXTIDR register, at the expense of some
 844           additional instructions during context switch. Say Y here only if you
 845           are planning to use hardware trace tools with this kernel.
 846
 847 endmenu