viawd(4)

viawd4

Device driver for via south bridge watchdog timer

Usage

device viawd

In loader.conf(5): viawd_load="YES"

Overview

The viawd driver provides watchdog(4) support for the watchdog interrupt timer present on VIA south bridge chipset (VT8251, CX700, VX800, VX855, VX900).

The VIA south bridge have a built-in watchdog timer, which can be enabled and disabled by user's program and set between 1 to 1023 seconds.

The viawd driver when unloaded with running watchdog will reschedule the watchdog to 5 minutes.

Releases

35 releases since FreeBSD 8.3-RELEASE; the text changed 22 times.

  1. 8.3
  2. 8.4
  3. 9.1
  4. 9.2
  5. 9.3
  6. 10.0
  7. 10.1
  8. 10.2
  9. 10.3
  10. 10.4
  11. 11.0
  12. 11.1
  13. 11.2
  14. 11.3
  15. 11.4
  16. 12.0
  17. 12.1
  18. 12.2
  19. 12.3
  20. 12.4
  21. 13.0–13.2
  22. 13.3–15.1
  23. 16.0

History

The viawd driver first appeared in FreeBSD 10.0.

Authors

The viawd driver and this manual page were written by Fabien Thomas ⟨[email protected]⟩.

From base 16.0-CURRENT-20261027-61c70dc16a79 in FreeBSD 16.0-CURRENT (2026-10-27). Parsed by carta from the page's mdoc source.