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 && EXPERIMENTAL
  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_CLPS711X_UART1
  93                 bool "Kernel low-level debugging messages via UART1"
  94                 depends on ARCH_CLPS711X
  95                 help
  96                   Say Y here if you want the debug print routines to direct
  97                   their output to the first serial port on these devices.
  98
  99         config DEBUG_CLPS711X_UART2
 100                 bool "Kernel low-level debugging messages via UART2"
 101                 depends on ARCH_CLPS711X
 102                 help
 103                   Say Y here if you want the debug print routines to direct
 104                   their output to the second serial port on these devices.
 105
 106         config DEBUG_DAVINCI_DA8XX_UART1
 107                 bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
 108                 depends on ARCH_DAVINCI_DA8XX
 109                 help
 110                   Say Y here if you want the debug print routines to direct
 111                   their output to UART1 serial port on DaVinci DA8XX devices.
 112
 113         config DEBUG_DAVINCI_DA8XX_UART2
 114                 bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
 115                 depends on ARCH_DAVINCI_DA8XX
 116                 help
 117                   Say Y here if you want the debug print routines to direct
 118                   their output to UART2 serial port on DaVinci DA8XX devices.
 119
 120         config DEBUG_DAVINCI_DMx_UART0
 121                 bool "Kernel low-level debugging on DaVinci DMx using UART0"
 122                 depends on ARCH_DAVINCI_DMx
 123                 help
 124                   Say Y here if you want the debug print routines to direct
 125                   their output to UART0 serial port on DaVinci DMx devices.
 126
 127         config DEBUG_DAVINCI_TNETV107X_UART1
 128                 bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
 129                 depends on ARCH_DAVINCI_TNETV107X
 130                 help
 131                   Say Y here if you want the debug print routines to direct
 132                   their output to UART1 serial port on DaVinci TNETV107X
 133                   devices.
 134
 135         config DEBUG_ZYNQ_UART0
 136                 bool "Kernel low-level debugging on Xilinx Zynq using UART0"
 137                 depends on ARCH_ZYNQ
 138                 help
 139                   Say Y here if you want the debug print routines to direct
 140                   their output to UART0 on the Zynq platform.
 141
 142         config DEBUG_ZYNQ_UART1
 143                 bool "Kernel low-level debugging on Xilinx Zynq using UART1"
 144                 depends on ARCH_ZYNQ
 145                 help
 146                   Say Y here if you want the debug print routines to direct
 147                   their output to UART1 on the Zynq platform.
 148
 149                   If you have a ZC702 board and want early boot messages to
 150                   appear on the USB serial adaptor, select this option.
 151
 152         config DEBUG_DC21285_PORT
 153                 bool "Kernel low-level debugging messages via footbridge serial port"
 154                 depends on FOOTBRIDGE
 155                 help
 156                   Say Y here if you want the debug print routines to direct
 157                   their output to the serial port in the DC21285 (Footbridge).
 158
 159         config DEBUG_FOOTBRIDGE_COM1
 160                 bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
 161                 depends on FOOTBRIDGE
 162                 help
 163                   Say Y here if you want the debug print routines to direct
 164                   their output to the 8250 at PCI COM1.
 165
 166         config DEBUG_HIGHBANK_UART
 167                 bool "Kernel low-level debugging messages via Highbank UART"
 168                 depends on ARCH_HIGHBANK
 169                 help
 170                   Say Y here if you want the debug print routines to direct
 171                   their output to the UART on Highbank based devices.
 172
 173         config DEBUG_IMX1_UART
 174                 bool "i.MX1 Debug UART"
 175                 depends on SOC_IMX1
 176                 help
 177                   Say Y here if you want kernel low-level debugging support
 178                   on i.MX1.
 179
 180         config DEBUG_IMX23_UART
 181                 bool "i.MX23 Debug UART"
 182                 depends on SOC_IMX23
 183                 help
 184                   Say Y here if you want kernel low-level debugging support
 185                   on i.MX23.
 186
 187         config DEBUG_IMX25_UART
 188                 bool "i.MX25 Debug UART"
 189                 depends on SOC_IMX25
 190                 help
 191                   Say Y here if you want kernel low-level debugging support
 192                   on i.MX25.
 193
 194         config DEBUG_IMX21_IMX27_UART
 195                 bool "i.MX21 and i.MX27 Debug UART"
 196                 depends on SOC_IMX21 || SOC_IMX27
 197                 help
 198                   Say Y here if you want kernel low-level debugging support
 199                   on i.MX21 or i.MX27.
 200
 201         config DEBUG_IMX28_UART
 202                 bool "i.MX28 Debug UART"
 203                 depends on SOC_IMX28
 204                 help
 205                   Say Y here if you want kernel low-level debugging support
 206                   on i.MX28.
 207
 208         config DEBUG_IMX31_IMX35_UART
 209                 bool "i.MX31 and i.MX35 Debug UART"
 210                 depends on SOC_IMX31 || SOC_IMX35
 211                 help
 212                   Say Y here if you want kernel low-level debugging support
 213                   on i.MX31 or i.MX35.
 214
 215         config DEBUG_IMX51_UART
 216                 bool "i.MX51 Debug UART"
 217                 depends on SOC_IMX51
 218                 help
 219                   Say Y here if you want kernel low-level debugging support
 220                   on i.MX51.
 221
 222         config DEBUG_IMX50_IMX53_UART
 223                 bool "i.MX50 and i.MX53 Debug UART"
 224                 depends on SOC_IMX50 || SOC_IMX53
 225                 help
 226                   Say Y here if you want kernel low-level debugging support
 227                   on i.MX50 or i.MX53.
 228
 229         config DEBUG_IMX6Q_UART
 230                 bool "i.MX6Q Debug UART"
 231                 depends on SOC_IMX6Q
 232                 help
 233                   Say Y here if you want kernel low-level debugging support
 234                   on i.MX6Q.
 235
 236         config DEBUG_MMP_UART2
 237                 bool "Kernel low-level debugging message via MMP UART2"
 238                 depends on ARCH_MMP
 239                 help
 240                   Say Y here if you want kernel low-level debugging support
 241                   on MMP UART2.
 242
 243         config DEBUG_MMP_UART3
 244                 bool "Kernel low-level debugging message via MMP UART3"
 245                 depends on ARCH_MMP
 246                 help
 247                   Say Y here if you want kernel low-level debugging support
 248                   on MMP UART3.
 249
 250         config DEBUG_MSM_UART1
 251                 bool "Kernel low-level debugging messages via MSM UART1"
 252                 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 253                 help
 254                   Say Y here if you want the debug print routines to direct
 255                   their output to the first serial port on MSM devices.
 256
 257         config DEBUG_MSM_UART2
 258                 bool "Kernel low-level debugging messages via MSM UART2"
 259                 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 260                 help
 261                   Say Y here if you want the debug print routines to direct
 262                   their output to the second serial port on MSM devices.
 263
 264         config DEBUG_MSM_UART3
 265                 bool "Kernel low-level debugging messages via MSM UART3"
 266                 depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 267                 help
 268                   Say Y here if you want the debug print routines to direct
 269                   their output to the third serial port on MSM devices.
 270
 271         config DEBUG_MSM8660_UART
 272                 bool "Kernel low-level debugging messages via MSM 8660 UART"
 273                 depends on ARCH_MSM8X60
 274                 select MSM_HAS_DEBUG_UART_HS
 275                 help
 276                   Say Y here if you want the debug print routines to direct
 277                   their output to the serial port on MSM 8660 devices.
 278
 279         config DEBUG_MSM8960_UART
 280                 bool "Kernel low-level debugging messages via MSM 8960 UART"
 281                 depends on ARCH_MSM8960
 282                 select MSM_HAS_DEBUG_UART_HS
 283                 help
 284                   Say Y here if you want the debug print routines to direct
 285                   their output to the serial port on MSM 8960 devices.
 286
 287         config DEBUG_MVEBU_UART
 288                 bool "Kernel low-level debugging messages via MVEBU UART"
 289                 depends on ARCH_MVEBU
 290                 help
 291                   Say Y here if you want kernel low-level debugging support
 292                   on MVEBU based platforms.
 293
 294         config DEBUG_PICOXCELL_UART
 295                 depends on ARCH_PICOXCELL
 296                 bool "Use PicoXcell UART for low-level debug"
 297                 help
 298                   Say Y here if you want kernel low-level debugging support
 299                   on PicoXcell based platforms.
 300
 301         config DEBUG_REALVIEW_STD_PORT
 302                 bool "RealView Default UART"
 303                 depends on ARCH_REALVIEW
 304                 help
 305                   Say Y here if you want the debug print routines to direct
 306                   their output to the serial port on RealView EB, PB11MP, PBA8
 307                   and PBX platforms.
 308
 309         config DEBUG_REALVIEW_PB1176_PORT
 310                 bool "RealView PB1176 UART"
 311                 depends on MACH_REALVIEW_PB1176
 312                 help
 313                   Say Y here if you want the debug print routines to direct
 314                   their output to the standard serial port on the RealView
 315                   PB1176 platform.
 316
 317         config DEBUG_S3C_UART0
 318                 depends on PLAT_SAMSUNG
 319                 bool "Use S3C UART 0 for low-level debug"
 320                 help
 321                   Say Y here if you want the debug print routines to direct
 322                   their output to UART 0. The port must have been initialised
 323                   by the boot-loader before use.
 324
 325                   The uncompressor code port configuration is now handled
 326                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 327
 328         config DEBUG_S3C_UART1
 329                 depends on PLAT_SAMSUNG
 330                 bool "Use S3C UART 1 for low-level debug"
 331                 help
 332                   Say Y here if you want the debug print routines to direct
 333                   their output to UART 1. The port must have been initialised
 334                   by the boot-loader before use.
 335
 336                   The uncompressor code port configuration is now handled
 337                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 338
 339         config DEBUG_S3C_UART2
 340                 depends on PLAT_SAMSUNG
 341                 bool "Use S3C UART 2 for low-level debug"
 342                 help
 343                   Say Y here if you want the debug print routines to direct
 344                   their output to UART 2. The port must have been initialised
 345                   by the boot-loader before use.
 346
 347                   The uncompressor code port configuration is now handled
 348                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 349
 350         config DEBUG_S3C_UART3
 351                 depends on PLAT_SAMSUNG && ARCH_EXYNOS
 352                 bool "Use S3C UART 3 for low-level debug"
 353                 help
 354                   Say Y here if you want the debug print routines to direct
 355                   their output to UART 3. The port must have been initialised
 356                   by the boot-loader before use.
 357
 358                   The uncompressor code port configuration is now handled
 359                   by CONFIG_S3C_LOWLEVEL_UART_PORT.
 360
 361         config DEBUG_SOCFPGA_UART
 362                 depends on ARCH_SOCFPGA
 363                 bool "Use SOCFPGA UART for low-level debug"
 364                 help
 365                   Say Y here if you want kernel low-level debugging support
 366                   on SOCFPGA based platforms.
 367
 368         config DEBUG_SUNXI_UART0
 369                 bool "Kernel low-level debugging messages via sunXi UART0"
 370                 depends on ARCH_SUNXI
 371                 help
 372                   Say Y here if you want kernel low-level debugging support
 373                   on Allwinner A1X based platforms on the UART0.
 374
 375         config DEBUG_SUNXI_UART1
 376                 bool "Kernel low-level debugging messages via sunXi UART1"
 377                 depends on ARCH_SUNXI
 378                 help
 379                   Say Y here if you want kernel low-level debugging support
 380                   on Allwinner A1X based platforms on the UART1.
 381
 382         config DEBUG_TEGRA_UART
 383                 depends on ARCH_TEGRA
 384                 bool "Use Tegra UART for low-level debug"
 385                 help
 386                   Say Y here if you want kernel low-level debugging support
 387                   on Tegra based platforms.
 388
 389         config DEBUG_VEXPRESS_UART0_DETECT
 390                 bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
 391                 depends on ARCH_VEXPRESS && CPU_CP15_MMU
 392                 help
 393                   This option enables a simple heuristic which tries to determine
 394                   the motherboard's memory map variant (original or RS1) and then
 395                   choose the relevant UART0 base address.
 396
 397                   Note that this will only work with standard A-class core tiles,
 398                   and may fail with non-standard SMM or custom software models.
 399
 400         config DEBUG_VEXPRESS_UART0_CA9
 401                 bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
 402                 depends on ARCH_VEXPRESS
 403                 help
 404                   This option selects UART0 at 0x10009000. Except for custom models,
 405                   this applies only to the V2P-CA9 tile.
 406
 407         config DEBUG_VEXPRESS_UART0_RS1
 408                 bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
 409                 depends on ARCH_VEXPRESS
 410                 help
 411                   This option selects UART0 at 0x1c090000. This applies to most
 412                   of the tiles using the RS1 memory map, including all new A-class
 413                   core tiles, FPGA-based SMMs and software models.
 414
 415         config DEBUG_LL_UART_NONE
 416                 bool "No low-level debugging UART"
 417                 depends on !ARCH_MULTIPLATFORM
 418                 help
 419                   Say Y here if your platform doesn't provide a UART option
 420                   below. This relies on your platform choosing the right UART
 421                   definition internally in order for low-level debugging to
 422                   work.
 423
 424         config DEBUG_ICEDCC
 425                 bool "Kernel low-level debugging via EmbeddedICE DCC channel"
 426                 help
 427                   Say Y here if you want the debug print routines to direct
 428                   their output to the EmbeddedICE macrocell's DCC channel using
 429                   co-processor 14. This is known to work on the ARM9 style ICE
 430                   channel and on the XScale with the PEEDI.
 431
 432                   Note that the system will appear to hang during boot if there
 433                   is nothing connected to read from the DCC.
 434
 435         config DEBUG_SEMIHOSTING
 436                 bool "Kernel low-level debug output via semihosting I/O"
 437                 help
 438                   Semihosting enables code running on an ARM target to use
 439                   the I/O facilities on a host debugger/emulator through a
 440                   simple SVC call. The host debugger or emulator must have
 441                   semihosting enabled for the special svc call to be trapped
 442                   otherwise the kernel will crash.
 443
 444                   This is known to work with OpenOCD, as well as
 445                   ARM's Fast Models, or any other controlling environment
 446                   that implements semihosting.
 447
 448                   For more details about semihosting, please see
 449                   chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
 450
 451 endchoice
 452
 453 config DEBUG_IMX6Q_UART_PORT
 454         int "i.MX6Q Debug UART Port (1-5)" if DEBUG_IMX6Q_UART
 455         range 1 5
 456         default 1
 457         depends on SOC_IMX6Q
 458         help
 459           Choose UART port on which kernel low-level debug messages
 460           should be output.
 461
 462 choice
 463         prompt "Low-level debug console UART"
 464         depends on DEBUG_LL && DEBUG_TEGRA_UART
 465
 466         config TEGRA_DEBUG_UART_AUTO_ODMDATA
 467         bool "Via ODMDATA"
 468         help
 469           Automatically determines which UART to use for low-level debug based
 470           on the ODMDATA value. This value is part of the BCT, and is written
 471           to the boot memory device using nvflash, or other flashing tool.
 472           When bits 19:18 are 3, then bits 17:15 indicate which UART to use;
 473           0/1/2/3/4 are UART A/B/C/D/E.
 474
 475         config TEGRA_DEBUG_UARTA
 476                 bool "UART A"
 477
 478         config TEGRA_DEBUG_UARTB
 479                 bool "UART B"
 480
 481         config TEGRA_DEBUG_UARTC
 482                 bool "UART C"
 483
 484         config TEGRA_DEBUG_UARTD
 485                 bool "UART D"
 486
 487         config TEGRA_DEBUG_UARTE
 488                 bool "UART E"
 489
 490 endchoice
 491
 492 config DEBUG_LL_INCLUDE
 493         string
 494         default "debug/icedcc.S" if DEBUG_ICEDCC
 495         default "debug/imx.S" if DEBUG_IMX1_UART || \
 496                                  DEBUG_IMX25_UART || \
 497                                  DEBUG_IMX21_IMX27_UART || \
 498                                  DEBUG_IMX31_IMX35_UART || \
 499                                  DEBUG_IMX51_UART || \
 500                                  DEBUG_IMX50_IMX53_UART ||\
 501                                  DEBUG_IMX6Q_UART
 502         default "debug/highbank.S" if DEBUG_HIGHBANK_UART
 503         default "debug/mvebu.S" if DEBUG_MVEBU_UART
 504         default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
 505         default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
 506         default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1
 507         default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
 508                 DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
 509         default "debug/tegra.S" if DEBUG_TEGRA_UART
 510         default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
 511         default "mach/debug-macro.S"
 512
 513 config EARLY_PRINTK
 514         bool "Early printk"
 515         depends on DEBUG_LL
 516         help
 517           Say Y here if you want to have an early console using the
 518           kernel low-level debugging functions. Add earlyprintk to your
 519           kernel parameters to enable this console.
 520
 521 config OC_ETM
 522         bool "On-chip ETM and ETB"
 523         depends on ARM_AMBA
 524         help
 525           Enables the on-chip embedded trace macrocell and embedded trace
 526           buffer driver that will allow you to collect traces of the
 527           kernel code.
 528
 529 config ARM_KPROBES_TEST
 530         tristate "Kprobes test module"
 531         depends on KPROBES && MODULES
 532         help
 533           Perform tests of kprobes API and instruction set simulation.
 534
 535 config PID_IN_CONTEXTIDR
 536         bool "Write the current PID to the CONTEXTIDR register"
 537         depends on CPU_COPY_V6
 538         help
 539           Enabling this option causes the kernel to write the current PID to
 540           the PROCID field of the CONTEXTIDR register, at the expense of some
 541           additional instructions during context switch. Say Y here only if you
 542           are planning to use hardware trace tools with this kernel.
 543
 544 endmenu