/share/man/man4/ichwd.4

https://bitbucket.org/freebsd/freebsd-head/ · Forth · 90 lines · 90 code · 0 blank · 0 comment · 2 complexity · 511ccf0f10b7784a0e9327e051970695 MD5 · raw file 

    

  1. .\"-
    2. 

  2. .\" Copyright (c) 2007 Dag-Erling Coïdan Smørgrav
    3. 

  3. .\" All rights reserved.
    4. 

  4. .\"
    5. 

  5. .\" Redistribution and use in source and binary forms, with or without
    6. 

  6. .\" modification, are permitted provided that the following conditions
    7. 

  7. .\" are met:
    8. 

  8. .\" 1. Redistributions of source code must retain the above copyright
    9. 

  9. .\"    notice, this list of conditions and the following disclaimer.
    10. 

  10. .\" 2. Redistributions in binary form must reproduce the above copyright
    11. 

  11. .\"    notice, this list of conditions and the following disclaimer in the
    12. 

  12. .\"    documentation and/or other materials provided with the distribution.
    13. 

  13. .\"
    14. 

  14. .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
    15. 

  15. .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    16. 

  16. .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    17. 

  17. .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
    18. 

  18. .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    19. 

  19. .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    20. 

  20. .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    21. 

  21. .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    22. 

  22. .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    23. 

  23. .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    24. 

  24. .\" SUCH DAMAGE.
    25. 

  25. .\"
    26. 

  26. .\" $FreeBSD$
    27. 

  27. .\"
    28. 

  28. .Dd August 20, 2008
    29. 

  29. .Dt ICHWD 4
    30. 

  30. .Os
    31. 

  31. .Sh NAME
    32. 

  32. .Nm ichwd
    33. 

  33. .Nd device driver for the Intel ICH watchdog interrupt timer
    34. 

  34. .Sh SYNOPSIS
    35. 

  35. To compile this driver into the kernel,
    36. 

  36. place the following line in your
    37. 

  37. kernel configuration file:
    38. 

  38. .Bd -ragged -offset indent
    39. 

  39. .Cd "device ichwd"
    40. 

  40. .Ed
    41. 

  41. .Pp
    42. 

  42. Alternatively, to load the driver as a
    43. 

  43. module at boot time, place the following line in
    44. 

  44. .Xr loader.conf 5 :
    45. 

  45. .Bd -literal -offset indent
    46. 

  46. ichwd_load="YES"
    47. 

  47. .Ed
    48. 

  48. .Sh DESCRIPTION
    49. 

  49. The
    50. 

  50. .Nm
    51. 

  51. driver provides
    52. 

  52. .Xr watchdog 4
    53. 

  53. support for the watchdog interrupt timer present on
    54. 

  54. all Intel ICH motherboard chipsets.
    55. 

  55. .Pp
    56. 

  56. The ICH WDT counts down in ticks of approximately 0.6 seconds; the
    57. 

  57. exact value depends on hardware quality and environmental factors.
    58. 

  58. Supported watchdog intervals range from 2 to 63 ticks.
    59. 

  59. .Pp
    60. 

  60. Note that on some ICH-based systems, the WDT may be present but
    61. 

  61. disabled, either in hardware or by the BIOS.
    62. 

  62. The
    63. 

  63. .Nm
    64. 

  64. driver attempts to detect this condition and will refuse to attach if
    65. 

  65. it believes the WDT is disabled.
    66. 

  66. .Sh SEE ALSO
    67. 

  67. .Xr watchdog 4 ,
    68. 

  68. .Xr watchdog 8 ,
    69. 

  69. .Xr watchdogd 8 ,
    70. 

  70. .Xr watchdog 9
    71. 

  71. .Rs
    72. 

  72. .%T Using the Intel ICH Family Watchdog Timer (WDT)
    73. 

  73. .%R Intel Application Note AP-725
    74. 

  74. .%O Document Number 292273-001
    75. 

  75. .Re
    76. 

  76. .Sh HISTORY
    77. 

  77. The
    78. 

  78. .Nm
    79. 

  79. driver first appeared in
    80. 

  80. .Fx 5.3 .
    81. 

  81. .Sh AUTHORS
    82. 

  82. .An -nosplit
    83. 

  83. The
    84. 

  84. .Nm
    85. 

  85. driver was written by
    86. 

  86. .An Wm. Daryl Hawkins Aq dhawkins@tamu.edu
    87. 

  87. of Texas A&M University and
    88. 

  88. .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
    89. 

  89. This manual page was written by
    90. 

  90. .An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org .
    91.