Last updated on JULY 29, 2016
Applies to:Solaris Operating System
***Checked for relevance on 30-Jul-2013***
When a system panics with a bad trap from an MMU miss, it is because the MMU does not have a translation entry for the virtual address(VA) used in the instruction to a physical(hardware) address(PA).
TO/BTO/DTO and BERR/DBERR panics are similar, in that they are caused by referencing an illegal address. In this case, however, the illegal address is the physical address(PA).
For practical purposes, a TO/BTO/DTO is caused by a PA that's valid for the system, but there is nothing at the address the PA is referencing, or the device at that address did not respond in time.
A BERR/DBERR, indicates that the PA being used is always illegal, or is reserved for the system.
Further details about TO/BTO/DTO/BERR/DBERR events, may be obtained from the specific processor reference manual.
TO = Timeout
BTO = Bus Timeout
DTO = Disrupting Timeout
BERR = Bus Error
DBERR = Disrupting Bus Error
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