| =================================== |
| Berkshire Products PC Watchdog Card |
| =================================== |
| |
| Last reviewed: 10/05/2007 |
| |
| Support for ISA Cards Revision A and C |
| ======================================= |
| |
| Documentation and Driver by Ken Hollis <kenji@bitgate.com> |
| |
| The PC Watchdog is a card that offers the same type of functionality that |
| the WDT card does, only it doesn't require an IRQ to run. Furthermore, |
| the Revision C card allows you to monitor any IO Port to automatically |
| trigger the card into being reset. This way you can make the card |
| monitor hard drive status, or anything else you need. |
| |
| The Watchdog Driver has one basic role: to talk to the card and send |
| signals to it so it doesn't reset your computer ... at least during |
| normal operation. |
| |
| The Watchdog Driver will automatically find your watchdog card, and will |
| attach a running driver for use with that card. After the watchdog |
| drivers have initialized, you can then talk to the card using a PC |
| Watchdog program. |
| |
| I suggest putting a "watchdog -d" before the beginning of an fsck, and |
| a "watchdog -e -t 1" immediately after the end of an fsck. (Remember |
| to run the program with an "&" to run it in the background!) |
| |
| If you want to write a program to be compatible with the PC Watchdog |
| driver, simply use of modify the watchdog test program: |
| tools/testing/selftests/watchdog/watchdog-test.c |
| |
| |
| Other IOCTL functions include: |
| |
| WDIOC_GETSUPPORT |
| This returns the support of the card itself. This |
| returns in structure "PCWDS" which returns: |
| |
| options = WDIOS_TEMPPANIC |
| (This card supports temperature) |
| firmware_version = xxxx |
| (Firmware version of the card) |
| |
| WDIOC_GETSTATUS |
| This returns the status of the card, with the bits of |
| WDIOF_* bitwise-anded into the value. (The comments |
| are in include/uapi/linux/watchdog.h) |
| |
| WDIOC_GETBOOTSTATUS |
| This returns the status of the card that was reported |
| at bootup. |
| |
| WDIOC_GETTEMP |
| This returns the temperature of the card. (You can also |
| read /dev/watchdog, which gives a temperature update |
| every second.) |
| |
| WDIOC_SETOPTIONS |
| This lets you set the options of the card. You can either |
| enable or disable the card this way. |
| |
| WDIOC_KEEPALIVE |
| This pings the card to tell it not to reset your computer. |
| |
| And that's all she wrote! |
| |
| -- Ken Hollis |
| (kenji@bitgate.com) |
