Based on kernel version 3.19. Page generated on 2015-02-13 21:23 EST.
1 Last reviewed: 10/05/2007 2 3 Berkshire Products PC Watchdog Card 4 Support for ISA Cards Revision A and C 5 Documentation and Driver by Ken Hollis <firstname.lastname@example.org> 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 19 drivers have initialized, you can then talk to the card using a PC 20 Watchdog program. 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 27 driver, simply use of modify the watchdog test program: 28 Documentation/watchdog/src/watchdog-test.c 29 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 (email@example.com)