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1 | Last reviewed: 10/05/2007 |
2 | ||
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3 | Berkshire Products PC Watchdog Card |
4 | Support for ISA Cards Revision A and C | |
5 | Documentation and Driver by Ken Hollis <kenji@bitgate.com> | |
6 | ||
7 | The PC Watchdog is a card that offers the same type of functionality that | |
8 | the WDT card does, only it doesn't require an IRQ to run. Furthermore, | |
9 | the Revision C card allows you to monitor any IO Port to automatically | |
10 | trigger the card into being reset. This way you can make the card | |
11 | monitor hard drive status, or anything else you need. | |
12 | ||
13 | The Watchdog Driver has one basic role: to talk to the card and send | |
14 | signals to it so it doesn't reset your computer ... at least during | |
15 | normal operation. | |
16 | ||
17 | The Watchdog Driver will automatically find your watchdog card, and will | |
18 | attach a running driver for use with that card. After the watchdog | |
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19 | drivers have initialized, you can then talk to the card using a PC |
20 | Watchdog program. | |
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21 | |
22 | I suggest putting a "watchdog -d" before the beginning of an fsck, and | |
23 | a "watchdog -e -t 1" immediately after the end of an fsck. (Remember | |
24 | to run the program with an "&" to run it in the background!) | |
25 | ||
26 | If you want to write a program to be compatible with the PC Watchdog | |
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27 | driver, simply use of modify the watchdog test program: |
28 | Documentation/watchdog/src/watchdog-test.c | |
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30 | |
31 | Other IOCTL functions include: | |
32 | ||
33 | WDIOC_GETSUPPORT | |
34 | This returns the support of the card itself. This | |
35 | returns in structure "PCWDS" which returns: | |
36 | options = WDIOS_TEMPPANIC | |
37 | (This card supports temperature) | |
38 | firmware_version = xxxx | |
39 | (Firmware version of the card) | |
40 | ||
41 | WDIOC_GETSTATUS | |
42 | This returns the status of the card, with the bits of | |
43 | WDIOF_* bitwise-anded into the value. (The comments | |
44 | are in linux/pcwd.h) | |
45 | ||
46 | WDIOC_GETBOOTSTATUS | |
47 | This returns the status of the card that was reported | |
48 | at bootup. | |
49 | ||
50 | WDIOC_GETTEMP | |
51 | This returns the temperature of the card. (You can also | |
52 | read /dev/watchdog, which gives a temperature update | |
53 | every second.) | |
54 | ||
55 | WDIOC_SETOPTIONS | |
56 | This lets you set the options of the card. You can either | |
57 | enable or disable the card this way. | |
58 | ||
59 | WDIOC_KEEPALIVE | |
60 | This pings the card to tell it not to reset your computer. | |
61 | ||
62 | And that's all she wrote! | |
63 | ||
64 | -- Ken Hollis | |
65 | (kenji@bitgate.com) | |
66 |