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Kconfig.debug

Kconfig.debug 2.0 KB
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  1. menu "Kernel hacking"
    2. 

  2. 

  3. source "lib/Kconfig.debug"
    4. 

  4. 

  5. config EARLY_PRINTK
    6. 

  6. 	bool "Early printk"
    7. 

  7. 	depends on EMBEDDED && DEBUG_KERNEL
    8. 

  8. 	default n
    9. 

  9. 	help
    10. 

  10. 	  Write kernel log output directly into the VGA buffer or to a serial
    11. 

  11. 	  port.
    12. 

  12. 

  13. 	  This is useful for kernel debugging when your machine crashes very
    14. 

  14. 	  early before the console code is initialized. For normal operation
    15. 

  15. 	  it is not recommended because it looks ugly and doesn't cooperate
    16. 

  16. 	  with klogd/syslogd or the X server. You should normally N here,
    17. 

  17. 	  unless you want to debug such a crash.
    18. 

  18. 

  19. config DEBUG_STACKOVERFLOW
    20. 

  20. 	bool "Check for stack overflows"
    21. 

  21. 	depends on DEBUG_KERNEL
    22. 

  22. 

  23. config DEBUG_PAGEALLOC
    24. 

  24. 	bool "Page alloc debugging"
    25. 

  25. 	depends on DEBUG_KERNEL
    26. 

  26. 	help
    27. 

  27. 	  Unmap pages from the kernel linear mapping after free_pages().
    28. 

  28. 	  This results in a large slowdown, but helps to find certain types
    29. 

  29. 	  of memory corruptions.
    30. 

  30. 

  31. config GDBSTUB
    32. 

  32. 	bool "Remote GDB kernel debugging"
    33. 

  33. 	depends on DEBUG_KERNEL
    34. 

  34. 	select DEBUG_INFO
    35. 

  35. 	select FRAME_POINTER
    36. 

  36. 	help
    37. 

  37. 	  If you say Y here, it will be possible to remotely debug the kernel
    38. 

  38. 	  using gdb. This enlarges your kernel ELF image disk size by several
    39. 

  39. 	  megabytes and requires a machine with more than 16 MB, better 32 MB
    40. 

  40. 	  RAM to avoid excessive linking time. This is only useful for kernel
    41. 

  41. 	  hackers. If unsure, say N.
    42. 

  42. 

  43. choice
    44. 

  44. 	prompt "GDB stub port"
    45. 

  45. 	default GDBSTUB_UART1
    46. 

  46. 	depends on GDBSTUB
    47. 

  47. 	help
    48. 

  48. 	  Select the on-CPU port used for GDB-stub
    49. 

  49. 

  50. config GDBSTUB_UART0
    51. 

  51. 	bool "/dev/ttyS0"
    52. 

  52. 

  53. config GDBSTUB_UART1
    54. 

  54. 	bool "/dev/ttyS1"
    55. 

  55. 

  56. endchoice
    57. 

  57. 

  58. config GDBSTUB_IMMEDIATE
    59. 

  59. 	bool "Break into GDB stub immediately"
    60. 

  60. 	depends on GDBSTUB
    61. 

  61. 	help
    62. 

  62. 	  If you say Y here, GDB stub will break into the program as soon as
    63. 

  63. 	  possible, leaving the program counter at the beginning of
    64. 

  64. 	  start_kernel() in init/main.c.
    65. 

  65. 

  66. config GDB_CONSOLE
    67. 

  67. 	bool "Console output to GDB"
    68. 

  68. 	depends on GDBSTUB
    69. 

  69. 	help
    70. 

  70. 	  If you are using GDB for remote debugging over a serial port and
    71. 

  71. 	  would like kernel messages to be formatted into GDB $O packets so
    72. 

  72. 	  that GDB prints them as program output, say 'Y'.
    73. 

  73. 

  74. endmenu
    75.