check man dumpadm 
Here is what mine looks like:
# dumpadm
      Dump content: kernel pages
       Dump device: /dev/zvol/dsk/rpool/dump (dedicated)
Savecore directory: /var/crash/unknown
  Savecore enabled: yes
#
Also add to end of /etc/system file
* reboot so the deadman timer will be enabled.
set snooping=1

Also once you update the bios and still have the issue also open a support with 
with the mother board manufacture and refernece CR 6745357
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